:root[data-theme="sepia"] {
    color-scheme: light;
    --bg-color: #fbf0d9;
    --text-color: #4a3b2c;
    --primary: #d97706;
    --primary-hover: #b45309;
    --success: #6c7a52;
    --success-hover: #586343;
    --danger: #b35959;
    --danger-hover: #994c4c;
    --glass-bg: #fbf0d9;
    --glass-border: rgba(92, 75, 55, 0.25);
    --bg-gradient: linear-gradient(135deg, #fdf6e3, #f5e6c8, #fdf6e3);
    --header-bg: #f5e6c8;
    --text-muted: #7d6b56;
    --input-bg: rgba(0,0,0,0.06);
    --dropdown-bg: #fdf6e3;
    --dropdown-color: #4a3b2c;
    --scrollbar-thumb: #c4a47c;
    --scrollbar-track: rgba(92, 75, 55, 0.08);
    --folder-color: #b45309;
    --file-color: #786450;
    --file-hover: #453625;
    --bg-img-brightness: 0.72;
    --bg-overlay-opacity: 0.45;
}

:root[data-theme="light"] {
    color-scheme: light;
    --bg-color: #ffffff;
    --text-color: #1e293b;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #8b5cf6; /* Vibrant Purple for PLAY */
    --success-hover: #7c3aed;
    --danger: #f43f5e; /* Bright Rose for STOP */
    --danger-hover: #e11d48;
    --glass-bg: #ffffff;
    --glass-border: rgba(0, 0, 0, 0.12);
    --bg-gradient: linear-gradient(135deg, #f8fafc, #e2e8f0, #f8fafc);
    --header-bg: #f8fafc;
    --text-muted: #64748b;
    --input-bg: rgba(0,0,0,0.05);
    --dropdown-bg: #ffffff;
    --dropdown-color: #1e293b;
    --scrollbar-thumb: #cbd5e1;
    --scrollbar-track: rgba(0, 0, 0, 0.04);
    --folder-color: #0284c7;
    --file-color: #475569;
    --file-hover: #0f172a;
    --bg-img-brightness: 0.95;
    --bg-overlay-opacity: 0.35;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --bg-color: #1a202c;
    --text-color: #f1f5f9;
    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --success: #f59e0b; /* Glowing Amber for PLAY */
    --success-hover: #d97706;
    --danger: #64748b; /* Muted Slate for STOP */
    --danger-hover: #475569;
    --glass-bg: #1e293b;
    --glass-border: rgba(255, 255, 255, 0.15);
    --bg-gradient: linear-gradient(135deg, #0f172a, #1e293b, #0f172a);
    --header-bg: #0f172a;
    --text-muted: #94a3b8;
    --input-bg: rgba(0,0,0,0.35);
    --dropdown-bg: #1e293b;
    --dropdown-color: #f1f5f9;
    --scrollbar-thumb: #475569;
    --scrollbar-track: rgba(15, 23, 42, 0.6);
    --folder-color: #fde047;
    --file-color: #94a3b8;
    --file-hover: #ffffff;
    --bg-img-brightness: 0.45;
    --bg-overlay-opacity: 0.65;
}

:root, :root[data-theme="ocean"] {
    color-scheme: dark;
    --bg-color: #0f172a;
    --text-color: #f8fafc;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --success: #14b8a6; /* Aquamarine/Teal for PLAY */
    --success-hover: #0d9488;
    --danger: #8b5cf6; /* Deep Violet for STOP */
    --danger-hover: #7c3aed;
    --glass-bg: #1e293b;
    --glass-border: rgba(255, 255, 255, 0.15);
    --bg-gradient: linear-gradient(135deg, #0f172a, #1e1b4b, #0f172a);
    --header-bg: #0f172a;
    --text-muted: #94a3b8;
    --input-bg: rgba(0,0,0,0.3);
    --dropdown-bg: #1e293b;
    --dropdown-color: #f8fafc;
    --scrollbar-thumb: #334155;
    --scrollbar-track: rgba(15, 23, 42, 0.6);
    --folder-color: #fde047;
    --file-color: #cbd5e1;
    --file-hover: #ffffff;
    --bg-img-brightness: 0.45;
    --bg-overlay-opacity: 0.65;
}

/* ==========================================
   5. 古典明亮主題 (Classical Light)
================================================ */
:root[data-theme="classical"] {
  color-scheme: light;
  --bg-color: #ffffff;
  --bg-gradient: linear-gradient(135deg, #f6f8fa, #ffffff, #f6f8fa);
  --text-color: #24292f;
  --text-muted: #6e7781;
  --primary: #0969da;
  --primary-hover: #03499e;
  --success: #2da44e;
  --success-hover: #22863a;
  --danger: #cf222e;
  --danger-hover: #a41e25;
  --glass-bg: #ffffff;
  --glass-border: #d0d7de;
  --header-bg: #f6f8fa;
  --input-bg: rgba(9, 105, 218, 0.05);
  --dropdown-bg: #ffffff;
  --dropdown-color: #24292f;
  --scrollbar-thumb: #d0d7de;
  --scrollbar-track: rgba(0, 0, 0, 0.04);
  --folder-color: #bf8700;
  --file-color: #57606a;
  --file-hover: #24292f;
  --bg-img-brightness: 0.92;
  --bg-overlay-opacity: 0.35;
}

/* ==========================================
   6. 護眼抹茶 (Matcha Green)
================================================ */
:root[data-theme="matcha"] {
  color-scheme: light;
  --bg-color: #c7edcc;
  --bg-gradient: linear-gradient(135deg, #d3f3d8, #c7edcc, #d3f3d8);
  --text-color: #243328;
  --text-muted: #4e6b54;
  --primary: #3b7b49;
  --primary-hover: #2d5f38;
  --success: #3a7946;
  --success-hover: #2d5d36;
  --danger: #cf222e;
  --danger-hover: #a41e25;
  --glass-bg: #c7edcc;
  --glass-border: rgba(69, 139, 84, 0.25);
  --header-bg: #d3f3d8;
  --input-bg: rgba(69, 139, 84, 0.1);
  --dropdown-bg: #d7f5dd;
  --dropdown-color: #243328;
  --scrollbar-thumb: #8ebf96;
  --scrollbar-track: rgba(43, 58, 47, 0.08);
  --folder-color: #3b7b49;
  --file-color: #4e6b54;
  --file-hover: #243328;
  --bg-img-brightness: 0.78;
  --bg-overlay-opacity: 0.45;
}

/* ==========================================
   7. 摩卡焙煎 (Mocha Dark)
================================================ */
:root[data-theme="mocha"] {
  color-scheme: dark;
  --bg-color: #2b2420;
  --bg-gradient: linear-gradient(135deg, #3d342f, #2b2420, #3d342f);
  --text-color: #f7ede6;
  --text-muted: #b8a698;
  --primary: #d49d74;
  --primary-hover: #b87e53;
  --success: #9e8c76;
  --success-hover: #7d6b56;
  --danger: #c76a6a;
  --danger-hover: #a85252;
  --glass-bg: #2b2420;
  --glass-border: rgba(212, 196, 183, 0.15);
  --header-bg: #3d342f;
  --input-bg: rgba(0, 0, 0, 0.25);
  --dropdown-bg: #3d342f;
  --dropdown-color: #f7ede6;
  --scrollbar-thumb: #6b5c53;
  --scrollbar-track: rgba(0, 0, 0, 0.3);
  --folder-color: #d49d74;
  --file-color: #b8a698;
  --file-hover: #ffffff;
  --bg-img-brightness: 0.50;
  --bg-overlay-opacity: 0.60;
}

/* ==========================================
   8. 沉浸電子墨水 (E-Ink Greyscale)
================================================ */
:root[data-theme="eink"] {
  color-scheme: light;
  --bg-color: #f4f4f4;
  --bg-gradient: linear-gradient(135deg, #ffffff, #f4f4f4, #ffffff);
  --text-color: #111111;
  --text-muted: #666666;
  --primary: #444444;
  --primary-hover: #222222;
  --success: #555555;
  --success-hover: #333333;
  --danger: #555555;
  --danger-hover: #333333;
  --glass-bg: #f4f4f4;
  --glass-border: rgba(180, 180, 180, 0.6);
  --header-bg: #ffffff;
  --input-bg: rgba(0, 0, 0, 0.06);
  --dropdown-bg: #ffffff;
  --dropdown-color: #111111;
  --scrollbar-thumb: #bbbbbb;
  --scrollbar-track: rgba(0, 0, 0, 0.05);
  --folder-color: #222222;
  --file-color: #555555;
  --file-hover: #000000;
  --bg-img-brightness: 0.90;
  --bg-overlay-opacity: 0.30;
}

/* ==========================================
   9. 櫻花淺霞 (Sakura Blush)
================================================ */
:root[data-theme="sakura"] {
  color-scheme: light;
  --bg-color: #fff0f5;
  --bg-gradient: linear-gradient(135deg, #fff7fa, #fff0f5, #fff7fa);
  --text-color: #3b2b32;
  --text-muted: #8a707c;
  --primary: #d67a96;
  --primary-hover: #b55e78;
  --success: #a07d8b;
  --success-hover: #80616e;
  --danger: #cf222e;
  --danger-hover: #a41e25;
  --glass-bg: #fff0f5;
  --glass-border: rgba(214, 122, 150, 0.2);
  --header-bg: #fff7fa;
  --input-bg: rgba(214, 122, 150, 0.08);
  --dropdown-bg: #fff5f8;
  --dropdown-color: #3b2b32;
  --scrollbar-thumb: #e2b0c3;
  --scrollbar-track: rgba(74, 59, 66, 0.08);
  --folder-color: #d67a96;
  --file-color: #8a707c;
  --file-hover: #3b2b32;
  --bg-img-brightness: 0.88;
  --bg-overlay-opacity: 0.45;
}

html {
    scroll-padding-top: 140px;
    scroll-behavior: smooth;
    background-color: #1a1614;
    min-height: 100%;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scrollbar-width: thin;
    scrollbar-color: var(--scrollbar-thumb) var(--scrollbar-track);
}

/* Custom Scrollbars (自訂清晰拉霸/滾動條) */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
    border: 2px solid transparent;
    background-clip: padding-box;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-serif: 'Lora', 'Merriweather', 'Noto Serif TC', 'Noto Serif SC', 'Songti SC', 'Songti TC', 'STSong', 'PMingLiU', 'SimSun', Georgia, 'Times New Roman', serif;
}

body {
    font-family: var(--font-sans);
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
    transition: color 0.5s ease;
}

/* Classical Bookish Serif for Titles & Brand Headings */
h1, h2, h3, .app-title, .logo-area h1, .station-title, #playlist-panel-title, #reader-chapter-title, .section-title, .reader-content h1, .reader-content h2, .reader-content h3 {
    font-family: var(--font-serif);
    letter-spacing: 0.3px;
}

/* 1. 全域古典圖書館虛擬背景 (Global Blurred Classical Library Background) */
body::before {
    content: "";
    position: fixed;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background-image: url('bg-library.jpg');
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    filter: blur(12px) brightness(var(--bg-img-brightness, 0.72));
    -webkit-filter: blur(12px) brightness(var(--bg-img-brightness, 0.72));
    transform: scale(1.08); /* 消除模糊邊緣白邊 */
    z-index: -2;
    pointer-events: none;
    transition: filter 0.5s ease;
}

/* 2. 主題色彩漸層環境覆蓋層 (Theme Gradient Ambient Glow) */
body::after {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-gradient);
    opacity: var(--bg-overlay-opacity, 0.45);
    z-index: -1;
    pointer-events: none;
    transition: background 0.5s ease, opacity 0.5s ease;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 上層卡片：實體不透明 (Solid Opaque Floating Cards) */
.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    box-shadow: 0 10px 32px rgba(0, 0, 0, 0.18), 0 1px 3px rgba(0, 0, 0, 0.08);
    transition: background 0.3s, border-color 0.3s;
}

/* 頂部導航列：實體不透明 (Solid Opaque Navigation Header) */
.glass-header {
    background: var(--header-bg);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
    transition: background 0.3s, border-color 0.3s;
}

/* 頂部導航列 ReadingSync 品牌圖標 LOGO (favicon.svg - 純透明立體有聲書) */
.brand-icon-logo {
    height: 38px;
    width: auto;
    max-width: 100px;
    display: block;
    object-fit: contain;
    flex-shrink: 0;
    margin-right: 11px; /* 與文字保持半個字母的黃金間距 */
    filter: drop-shadow(0 2px 5px rgba(0, 0, 0, 0.22));
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.3s ease, opacity 0.25s ease;
    user-select: none;
    -webkit-user-select: none;
}
.logo-area:hover .brand-icon-logo {
    transform: scale(1.08) translateY(-1px);
    filter: drop-shadow(0 3px 8px rgba(111, 227, 214, 0.45));
}
.logo-area:active .brand-icon-logo {
    transform: scale(0.96);
}

/* 頂部導航列 ReadingSync 品牌向量 Banner */
.brand-banner-svg {
    height: 32px;
    width: auto;
    max-width: 215px;
    display: block;
    cursor: pointer;
    transition: transform 0.25s ease, opacity 0.25s ease;
    user-select: none;
    -webkit-user-select: none;
}
.brand-banner-svg:hover {
    transform: scale(1.03);
}
.brand-banner-svg:active {
    transform: scale(0.98);
}
.brand-reading-text {
    fill: #1A130E;
    transition: fill 0.3s ease;
}
:root[data-theme="dark"] .brand-reading-text,
:root[data-theme="ocean"] .brand-reading-text,
:root:not([data-theme="light"]):not([data-theme="sepia"]) .brand-reading-text {
    fill: #F8FAFC;
}
:root[data-theme="sepia"] .brand-reading-text {
    fill: #3b2819;
}
:root[data-theme="light"] .brand-reading-text {
    fill: #1A130E;
}
@media (max-width: 600px) {
    .brand-icon-logo {
        height: 30px;
        width: auto;
        max-width: 80px;
        margin-right: 8px;
    }
    .brand-banner-svg {
        height: 26px;
        max-width: 175px;
    }
}

/* 頂部導航列漢堡選單按鈕 (Hamburger Menu Icon) */
.hamburger-menu-btn {
    display: inline-flex !important;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    padding: 0 !important;
    border-radius: 8px;
    background: transparent !important;
    border: 1px solid transparent !important;
    color: var(--text-color, #f8fafc) !important;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: none !important;
}
.hamburger-menu-btn:hover {
    background: rgba(255, 255, 255, 0.1) !important;
    border-color: rgba(255, 255, 255, 0.18) !important;
    transform: translateY(-1px);
    color: var(--primary, #38bdf8) !important;
}
.hamburger-menu-btn:active {
    transform: scale(0.95);
    background: rgba(255, 255, 255, 0.15) !important;
}
.hamburger-menu-btn svg {
    display: block;
    stroke: currentColor;
    transition: stroke 0.2s ease, transform 0.2s ease;
}


h1, h2, h3 { font-weight: 700; color: var(--text-color); transition: color 0.3s; }
.logo { font-size: 1.5rem; font-weight: 700; letter-spacing: 1px; color: var(--text-color); }
.logo span { color: var(--primary); }

.btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}
.primary-btn { background: var(--primary); color: white; }
.primary-btn:hover { background: var(--primary-hover); transform: translateY(-2px); }
.success-btn { background: var(--success); color: white; }
.success-btn:hover { background: var(--success-hover); transform: translateY(-2px); }
.danger-btn { background: var(--danger); color: white; }
.danger-btn:hover { background: var(--danger-hover); transform: translateY(-2px); }
.secondary-btn { background: transparent; color: var(--text-color); border: 1px solid var(--glass-border); }
.secondary-btn:hover { background: var(--glass-border); }
.text-btn { background: transparent; color: var(--text-muted); }
.text-btn:hover { color: var(--text-color); }
.icon-btn { background: transparent; color: var(--text-color); font-size: 1.5rem; padding: 0.5rem; }

.screen { display: none; opacity: 0; transition: opacity 0.4s ease; }
.screen.active { display: block; opacity: 1; }

#login-screen {
    display: none !important;
}

.login-card {
    position: relative;
    z-index: 1;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 18px;
    padding: 2rem 1.8rem;
    width: 100%;
    max-width: 440px;
    text-align: center;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.15), 0 0 0 1px var(--glass-border);
    border: 1px solid var(--glass-border);
    box-sizing: border-box;
    transition: background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}
.logo-area h1 { margin-bottom: 0.5rem; font-size: 2rem; color: var(--text-color); }
.logo-area span { color: var(--primary); }
.login-card p { color: var(--text-muted); margin-bottom: 1.2rem; }
.input-group input {
    width: 100%;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    background: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    outline: none;
    transition: border-color 0.3s;
}
.input-group input:focus { border-color: var(--primary); }
.login-card .btn { width: 100%; }

.container { max-width: 1200px; margin: 0 auto; padding: 2rem; }
.section-title { margin-bottom: 2rem; color: var(--text-color); }
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}
.station-card {
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}
.station-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 40px rgba(0,0,0, 0.1);
}
.station-card h3 { font-size: 1.25rem; color: var(--text-color); }
.badge {
    align-self: flex-start;
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 600;
}
.badge.free { background: rgba(16, 185, 129, 0.2); color: #10b981; }
.badge.occupied { background: rgba(239, 68, 68, 0.2); color: #ef4444; }

/* ==========================================
   古騰堡活頁書籤標籤樣式 (Folder / Bookmark Tabs - High-Contrast Redesign)
================================================ */
.gutenberg-tabs {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    margin-top: 1.25rem;
    margin-bottom: 0 !important;
    padding: 0 8px;
    position: relative;
    z-index: 10;
    background: transparent;
}
.g-tab-btn {
    flex: 1;
    padding: 11px 12px 10px 12px;
    background: rgba(15, 23, 42, 0.42);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: none;
    color: var(--text-muted);
    border-radius: 12px 12px 0 0;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    white-space: nowrap;
    position: relative;
    top: 0;
    opacity: 0.72;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.08);
}

/* 主題適配：淺色主題下的 Inactive Tab 背景 */
:root[data-theme="light"] .g-tab-btn,
:root[data-theme="sepia"] .g-tab-btn,
:root[data-theme="sakura"] .g-tab-btn,
:root[data-theme="matcha"] .g-tab-btn,
:root[data-theme="eink"] .g-tab-btn {
    background: rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(0, 0, 0, 0.12);
    border-bottom: none;
    color: var(--text-muted);
    opacity: 0.75;
}

/* 主題適配：深色主題下的 Inactive Tab 背景 */
:root[data-theme="dark"] .g-tab-btn,
:root[data-theme="ocean"] .g-tab-btn,
:root[data-theme="mocha"] .g-tab-btn {
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-bottom: none;
    color: var(--text-muted);
    opacity: 0.72;
}

.g-tab-btn:hover:not(.active) {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-color);
    opacity: 0.95;
    transform: translateY(-2px);
    box-shadow: 0 -4px 12px rgba(0, 0, 0, 0.12);
}

:root[data-theme="light"] .g-tab-btn:hover:not(.active),
:root[data-theme="sepia"] .g-tab-btn:hover:not(.active),
:root[data-theme="sakura"] .g-tab-btn:hover:not(.active),
:root[data-theme="matcha"] .g-tab-btn:hover:not(.active),
:root[data-theme="eink"] .g-tab-btn:hover:not(.active) {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-color);
}

/* 核心焦點：高對比度 Active Tab (選中頁籤) */
.g-tab-btn.active {
    background: var(--bg-color, #1e293b);
    color: var(--text-color, #ffffff);
    font-size: 1rem;
    font-weight: 800;
    letter-spacing: 0.02em;
    opacity: 1;
    transform: translateY(-2px);
    padding-top: 13px;
    padding-bottom: 12px;
    z-index: 5;
    border: 1.5px solid var(--primary);
    border-bottom: none;
    box-shadow: 0 -6px 20px rgba(0, 0, 0, 0.28), 0 0 14px rgba(212, 157, 116, 0.35);
    overflow: hidden;
}

/* 頂部強烈醒目的 Accent Indicator 光條 */
.g-tab-btn.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3.5px;
    background: var(--primary);
    box-shadow: 0 1px 8px var(--primary);
    border-radius: 12px 12px 0 0;
}

/* 深色模式下：選中標籤內部光澤漸層與文字純白增強 */
:root[data-theme="dark"] .g-tab-btn.active,
:root[data-theme="ocean"] .g-tab-btn.active,
:root[data-theme="mocha"] .g-tab-btn.active {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.14) 0%, rgba(255, 255, 255, 0.03) 100%), var(--bg-color);
    color: #ffffff;
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.7);
    border: 1.5px solid var(--primary);
    border-bottom: none;
}

/* 淺色模式下：選中標籤純白實體層次增強 */
:root[data-theme="light"] .g-tab-btn.active,
:root[data-theme="sepia"] .g-tab-btn.active,
:root[data-theme="sakura"] .g-tab-btn.active,
:root[data-theme="matcha"] .g-tab-btn.active,
:root[data-theme="eink"] .g-tab-btn.active {
    background: #ffffff;
    color: var(--text-color);
    border: 1.5px solid var(--primary);
    border-bottom: none;
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.12), 0 0 10px rgba(0, 0, 0, 0.05);
}

.reader-container {
    position: relative;
    background: var(--bg-color);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    color: var(--text-color);
    height: 600px;
}
.reader-header {
    padding: 6px 12px;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    flex-direction: row;
    align-items: stretch;
    gap: 10px;
    background: var(--header-bg);
}
.reader-header-left {
    display: flex;
    align-items: stretch;
    flex-shrink: 0;
}
.reader-header-right {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    flex: 1 1 auto;
    min-width: 0;
}
#btn-zen-mode {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    align-self: stretch;
    height: 100%;
    min-height: 52px;
    padding: 0 14px;
    font-size: 0.9rem;
    font-weight: 700;
    border-radius: 9px;
    white-space: nowrap;
    flex-shrink: 0;
    background: linear-gradient(135deg, #2563eb 0%, #1d4ed8 100%);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
    transition: all 0.2s ease;
    cursor: pointer;
}
#btn-zen-mode:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.45);
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}
.reader-header-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
    width: 100%;
}
.reader-title-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
}
#reader-chapter-title {
    font-size: 0.92rem;
    font-weight: 600;
    line-height: 1.35;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}
.reader-header-sub-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    flex-wrap: nowrap;
    overflow-x: auto;
}
#reader-audio-time {
    font-size: 0.85rem;
    font-weight: normal;
    opacity: 0.85;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
    flex-shrink: 0;
}
.reader-header-actions {
    display: flex;
    align-items: center;
    gap: 6px;
    flex-shrink: 0;
    white-space: nowrap;
}
/* 英語語系下自動隱藏中英機翻按鈕 */
html[lang="en"] #btn-read-mode-bi,
body.lang-en #btn-read-mode-bi,
[data-lang="en"] #btn-read-mode-bi {
    display: none !important;
}
.reader-content-wrapper {
    padding: 12px 18px 28px 18px;
    overflow-y: auto;
    flex: 1;
    scroll-behavior: smooth;
}
#reader-content {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-color);
    transition: font-size 0.2s, color 0.3s, background-color 0.3s;
    padding: 8px 6px 32px 6px;
    border-radius: 12px;
}
.reader-paragraph:last-child {
    margin-bottom: 2.5rem;
}

select, input, button {
    font-family: inherit;
}

/* ==========================================
   全域下拉選單 / 選項清晰度改善 (Select & Options)
================================================ */
select, .theme-select {
    font-family: inherit;
    color-scheme: inherit;
    background-color: var(--dropdown-bg, var(--bg-color)) !important;
    color: var(--dropdown-color, var(--text-color)) !important;
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 6px 10px;
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.3s ease, color 0.3s ease;
}

select:focus, .theme-select:focus {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 2px rgba(217, 119, 6, 0.25);
}

select option, select optgroup, .theme-select option {
    background-color: var(--dropdown-bg, var(--bg-color)) !important;
    color: var(--dropdown-color, var(--text-color)) !important;
    font-size: 0.92rem;
    padding: 8px 12px;
    font-weight: 500;
}

select option:hover, select option:checked, .theme-select option:checked {
    background-color: var(--primary) !important;
    color: #ffffff !important;
}

/* ==========================================
   多選分類標籤 (Multi-select Category Chips)
================================================ */
.fav-cat-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 4px 10px;
    border-radius: 16px;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: var(--glass-bg);
    color: var(--text-color);
    border: 1px solid var(--glass-border);
}

.fav-cat-chip:hover {
    filter: brightness(1.1);
    transform: translateY(-1px);
    border-color: var(--primary);
}

.fav-cat-chip.active {
    background: var(--primary) !important;
    color: #ffffff !important;
    border-color: var(--primary) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.fav-cat-chip input[type="checkbox"] {
    display: none;
}

/* ==========================================
   全站設定選單 / 折疊卡片 (Settings Modal & Accordions)
================================================ */
.settings-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.65);
    z-index: 2400;
    display: flex;
    flex-direction: column;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    overflow-y: auto;
    padding: 1rem;
    box-sizing: border-box;
}

.settings-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 680px;
    width: 100%;
    margin: 0 auto 0.8rem auto;
    color: var(--text-color);
}

.settings-modal-content {
    max-width: 680px;
    width: 100%;
    margin: 0 auto 2rem auto;
    padding: 1.2rem;
    border-radius: 14px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.settings-section-card {
    background: var(--card-bg, rgba(255, 255, 255, 0.05));
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 12px 14px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.settings-section-header {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 10px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--glass-border);
    display: flex;
    align-items: center;
    gap: 6px;
}

.settings-sub-header {
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--text-muted);
    margin: 10px 0 6px 0;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.menu-item {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.menu-item label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-color);
}

/* Accordion Styling */
.settings-accordion-card {
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.settings-accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 2px 0;
    user-select: none;
    color: var(--text-color);
    transition: color 0.2s ease;
}

.settings-accordion-header:hover {
    color: var(--primary);
}

.accordion-arrow {
    font-size: 0.85rem;
    color: var(--text-muted);
    transition: transform 0.2s ease, color 0.2s ease;
    padding: 2px 6px;
    border-radius: 4px;
}

.settings-accordion-header:hover .accordion-arrow {
    color: var(--primary);
    background: var(--input-bg);
}

.settings-badge {
    font-size: 0.78rem;
    padding: 2px 8px;
    border-radius: 12px;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-muted);
}

.accordion-expanded {
    border-color: var(--primary-alpha, var(--glass-border));
}

.system-tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 8px;
    margin-top: 8px;
}

.system-tools-grid .menu-btn {
    padding: 8px 12px;
    font-size: 0.85rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-color);
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.system-tools-grid .menu-btn:hover {
    border-color: var(--primary);
    background: var(--card-bg);
    color: var(--primary);
    transform: translateY(-1px);
}
.zoom-btn {
    background: var(--glass-border);
    border: none;
    border-radius: 6px;
    width: 32px;
    height: 28px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-weight: bold;
    color: var(--text-color);
    box-sizing: border-box;
    text-align: center;
    line-height: 1;
    flex-shrink: 0;
}
.zoom-btn:hover { background: var(--input-bg); }

@media (max-width: 768px) {
    .glass-header { 
        padding: 0.5rem 0.8rem; 
        flex-wrap: nowrap; 
        gap: 8px; 
        justify-content: space-between;
        align-items: center;
    }
    .logo, .station-title { 
        flex: 1 1 auto; 
        text-align: center; 
        order: 0; 
        font-size: 1.15rem; 
        font-weight: 700;
        margin: 0;
        white-space: nowrap;
        overflow: hidden;
        text-overflow: ellipsis;
        min-width: 0;
    }
    #back-btn {
        flex-shrink: 0;
        padding: 0.35rem 0.6rem;
        font-size: 0.95rem;
        white-space: nowrap;
    }
    .user-profile {
        width: auto;
        justify-content: flex-end;
        flex-shrink: 0;
    }
    .btn { padding: 0.8rem; font-size: 1rem; }
    .container { padding: 1rem; }
    .grid { grid-template-columns: 1fr; }
    .control-panel, .playlist-panel { padding: 1.5rem; }
    .reader-container { 
        height: calc(100dvh - 105px); 
        max-height: calc(100vh - 95px);
        margin-top: 0.4rem !important;
    }
    .reader-header {
        padding: 5px 8px;
        gap: 6px;
        display: flex;
        flex-direction: row;
        align-items: stretch;
    }
    .reader-header-left {
        display: flex;
        align-items: stretch;
        flex-shrink: 0;
    }
    .reader-header-right {
        display: flex;
        flex-direction: column;
        justify-content: center;
        gap: 3px;
        flex: 1 1 auto;
        min-width: 0;
    }
    .reader-header-top-row {
        gap: 6px !important;
    }
    .reader-title-wrap {
        gap: 6px !important;
        flex: 1 1 auto !important;
        min-width: 0 !important;
    }
    #reader-chapter-title {
        font-size: 0.82rem !important;
        font-weight: 600;
        line-height: 1.25;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
        min-width: 0 !important;
    }
    .reader-header-sub-row {
        gap: 6px !important;
    }
    #reader-audio-time {
        font-size: 0.75rem !important;
    }
    .reader-mode-btn {
        padding: 1px 6px !important;
        font-size: 0.74rem !important;
        height: 24px !important;
        border-radius: 5px !important;
    }
    .reader-header-actions {
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        gap: 4px !important;
        flex-shrink: 0 !important;
        white-space: nowrap !important;
    }
    .reader-header .zoom-btn {
        width: 28px !important;
        height: 28px !important;
        padding: 0 !important;
        font-size: 0.78rem !important;
        margin-left: 0 !important;
        border-radius: 6px !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
        flex-shrink: 0 !important;
    }
    #btn-zen-mode {
        padding: 0 10px !important;
        font-size: 0.82rem !important;
        font-weight: 700 !important;
        border-radius: 8px !important;
        white-space: nowrap !important;
        flex-shrink: 0 !important;
        height: 100% !important;
        min-height: 48px !important;
        align-self: stretch !important;
        display: inline-flex !important;
        align-items: center !important;
        justify-content: center !important;
    }
    body.zen-mode #btn-zen-mode {
        min-height: 48px !important;
        font-size: 0.82rem !important;
        padding: 0 10px !important;
    }
    .reader-mode-toolbar {
        padding: 4px 8px !important;
        gap: 6px !important;
    }
    .reader-content-wrapper {
        padding: 6px 12px 24px 12px !important;
    }
    #reader-content {
        padding: 4px 2px 24px 2px !important;
    }
    #reader-sentence-controls {
        padding: 6px 4px !important;
    }
    body.zen-mode #reader-chapter-title {
        font-size: 0.76rem !important;
        line-height: 1.25;
        white-space: normal !important;
        word-break: break-word !important;
    }
    body.zen-mode #reader-audio-time {
        font-size: 0.72rem !important;
    }
    .gutenberg-tabs { 
        top: 130px; 
        display: flex !important;
        width: 100% !important;
        box-sizing: border-box !important;
        padding: 0 4px !important;
        gap: 3px !important;
    }
    .g-tab-btn {
        flex: 1 1 0 !important;
        min-width: 0 !important;
        padding: 8px 2px 7px 2px !important;
        font-size: 0.82rem !important;
        gap: 2px !important;
        white-space: nowrap !important;
        overflow: hidden !important;
        text-overflow: ellipsis !important;
    }
    .reader-header-left #btn-zen-mode {
        padding: 0 8px !important;
        font-size: 0.78rem !important;
        min-height: 44px !important;
    }
    #filter-container { flex-direction: column !important; }
    .search-input-row { flex-wrap: wrap; }
    .search-input-row > input { flex: 1 1 100% !important; }
    .search-input-row > button { flex: 1; }
    .file-item { display: flex; flex-direction: column; align-items: flex-start; gap: 4px; }
    .book-tags { margin-left: 20px; gap: 4px; }
    .tree-container { padding-left: 6px !important; }
    .sync-section-folder > .tree-container { padding: 4px 2px 6px 4px !important; }
    .tree-file, .file-item { padding: 4px 0 4px 2px !important; }
    .chapter-item-row { padding: 5px 2px 5px 4px !important; gap: 4px !important; }
    .chapter-title-text { font-size: 0.86rem !important; line-height: 1.25 !important; white-space: normal !important; word-break: break-word !important; overflow-wrap: anywhere !important; }
    .chapter-btn-group { gap: 3px !important; }
    .btn-chapter-action { padding: 2px 4px !important; font-size: 0.92rem !important; min-width: 26px !important; height: 26px !important; }
    .vocab-list-item { padding: 10px 12px !important; gap: 6px !important; }
    .vocab-list-body { padding-left: 4px !important; }
    .folder-item > span { 
        padding: 12px 14px !important; 
        font-size: 1.08rem !important; 
        min-height: 48px !important; 
        margin: 4px 0 !important;
    }
    .sync-section-folder > span { 
        padding: 14px 16px !important; 
        font-size: 1.18rem !important; 
        min-height: 52px !important; 
    }
    .tree-dir > span { 
        padding: 9px 8px !important; 
        font-size: 0.95rem !important;
        min-height: 42px !important; 
    }
    .site-footer {
        margin: 1rem 0.6rem 1.5rem 0.6rem;
        padding: 0.65rem 0.8rem;
        font-size: 0.76rem;
    }
}

.tree-dir > summary, .folder-item > span {
    color: var(--folder-color);
    font-size: 1.15rem;
    font-weight: 700;
    padding: 10px 12px;
    margin: 3px 0;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.03);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    user-select: none;
    min-height: 44px;
}
.tree-dir > summary:hover, .folder-item > span:hover {
    color: var(--primary);
    background: rgba(0, 0, 0, 0.07);
    transform: translateX(2px);
}
.tree-dir > summary:active, .folder-item > span:active {
    transform: scale(0.99);
}
.tree-dir > span {
    padding: 8px 10px;
    display: block;
    border-radius: 6px;
    margin: 2px 0;
    line-height: 1.35;
    transition: all 0.2s ease;
}
.tree-dir > span:hover {
    background: rgba(0, 0, 0, 0.04);
}
.tree-file, .file-item {
    font-size: 0.95rem;
    color: var(--file-color);
    padding: 4px 0 4px 10px;
    cursor: pointer;
    transition: color 0.2s ease;
    list-style-type: none;
}
.tree-file:hover, .file-item:hover {
    color: var(--file-hover);
}
.tree-container {
    list-style-type: none;
    padding-left: 1rem;
}
.folder-item { list-style-type: none; }

/* Chapter Item Row & Action Buttons */
.chapter-item-row {
    display: flex !important;
    align-items: center !important;
    justify-content: space-between !important;
    width: 100% !important;
    box-sizing: border-box !important;
    padding: 5px 6px 5px 8px !important;
    gap: 8px !important;
    min-width: 0 !important;
}

.chapter-title-text {
    flex: 1 1 auto !important;
    min-width: 0 !important;
    white-space: normal !important;
    word-break: break-word !important;
    overflow-wrap: anywhere !important;
    font-size: 0.92rem !important;
    line-height: 1.25 !important;
    cursor: pointer !important;
    color: var(--file-color);
    transition: color 0.2s ease;
}
.chapter-title-text:hover {
    color: var(--file-hover);
}

.chapter-btn-group {
    display: inline-flex !important;
    align-items: center !important;
    gap: 4px !important;
    flex-shrink: 0 !important;
    margin-left: auto !important;
    align-self: center !important;
}

.btn-chapter-action {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    padding: 3px 6px !important;
    font-size: 1.05rem !important;
    line-height: 1 !important;
    border-radius: 6px !important;
    margin: 0 !important;
    flex-shrink: 0 !important;
    min-width: 30px !important;
    height: 28px !important;
}

.theme-select {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 6px;
    padding: 6px;
    margin-right: 10px;
    font-weight: bold;
    color: var(--text-color);
    outline: none;
    cursor: pointer;
}
.theme-select:hover {
    background: var(--input-bg);
}

audio {
    width: 100%;
    outline: none;
    margin-top: 10px;
    margin-bottom: 10px;
}
.marquee-container {
    width: 100%;
    overflow: hidden;
    white-space: nowrap;
    position: relative;
    box-sizing: border-box;
    background: var(--input-bg);
    padding: 5px 10px;
    border-radius: 4px;
    margin-bottom: 10px;
}
.marquee-text {
    display: inline-block;
    white-space: nowrap;
    animation: scrollText 15s linear infinite;
    padding-left: 100%;
    color: var(--text-color);
}

@keyframes scrollText {
    0% { transform: translateX(0); }
    100% { transform: translateX(-100%); }
}

.station-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: 1px;
    transition: color 0.3s ease;
}

.station-title.hidden-text,
.brand-banner-svg.hidden-text,
.brand-icon-logo.hidden-text {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.92);
}

.cookie-modal {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 500px;
    z-index: 9999;
    padding: 1.5rem;
}

/* 頁尾版權與來源宣告 (Site Footer & Disclaimer - Pure Frameless Text) */
.site-footer {
    text-align: center;
    font-size: 0.8rem;
    line-height: 1.6;
    color: var(--text-muted, #94a3b8);
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    padding: 0.6rem 1rem;
    margin: 1.5rem auto 1.5rem auto;
    max-width: 860px;
    transition: color 0.3s ease;
    user-select: text;
}

.site-footer p {
    margin: 0 0 0.35rem 0;
    color: var(--text-muted, #94a3b8);
    opacity: 0.85;
    font-weight: 400;
    font-size: 0.78rem;
    line-height: 1.55;
}

.site-footer p:last-child {
    margin-bottom: 0;
}

.site-footer a.footer-email-link {
    color: var(--primary, #38bdf8);
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 500;
    word-break: break-all;
    transition: color 0.2s ease, opacity 0.2s ease;
}

.site-footer a.footer-email-link:hover {
    color: var(--accent, #60a5fa);
    opacity: 0.85;
}

/* 登入頁面背景下之宣告字體：清晰灰白文字 */
body:has(#login-screen.active) .site-footer,
.screen.active#login-screen ~ .site-footer {
    color: #cbd5e1;
}

body:has(#login-screen.active) .site-footer p,
.screen.active#login-screen ~ .site-footer p {
    color: #cbd5e1;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.45);
}

body:has(#login-screen.active) .site-footer a.footer-email-link,
.screen.active#login-screen ~ .site-footer a.footer-email-link {
    color: #93c5fd;
}

/* --- Zen Mode (Fullscreen Reader) --- */
body.zen-mode {
    overflow: hidden !important;
    background: var(--bg-color) !important;
}

body.zen-mode header { display: none !important; }
body.zen-mode footer { display: none !important; }
body.zen-mode .theme-switcher-container { display: none !important; }
body.zen-mode .gutenberg-tabs { display: none !important; }
body.zen-mode .playback-options { display: none !important; }
body.zen-mode .controls-wrapper { display: none !important; }
body.zen-mode .marquee-container { display: none !important; }

/* Make the reader panel take the whole screen */
body.zen-mode #reader-panel,
body.zen-mode .reader-container {
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    right: 0 !important;
    bottom: 0 !important;
    width: 100vw !important;
    width: 100dvw !important;
    height: 100vh !important;
    height: 100dvh !important;
    max-height: 100dvh !important;
    margin: 0 !important;
    padding: 0 !important;
    border: none !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    z-index: 99999 !important;
    display: flex !important;
    flex-direction: column !important;
    background: var(--bg-color) !important;
}

body.zen-mode .reader-header {
    padding: 6px 12px !important;
    display: flex !important;
    flex-direction: row !important;
    align-items: stretch !important;
    gap: 10px !important;
    background: var(--header-bg) !important;
    border-radius: 0 !important;
    border-top: none !important;
    border-left: none !important;
    border-right: none !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08) !important;
}
body.zen-mode .reader-header-left {
    display: flex !important;
    align-items: stretch !important;
    flex-shrink: 0 !important;
}
body.zen-mode .reader-header-right {
    display: flex !important;
    flex-direction: column !important;
    justify-content: center !important;
    gap: 4px !important;
    flex: 1 1 auto !important;
    min-width: 0 !important;
}
body.zen-mode .reader-header-top-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 6px;
    width: 100%;
}
body.zen-mode .reader-title-wrap {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1 1 auto;
    min-width: 0;
    overflow: hidden;
}
body.zen-mode #reader-chapter-title {
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.3;
    opacity: 0.95;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
}
body.zen-mode .reader-header-sub-row {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
}
body.zen-mode #reader-audio-time {
    font-size: 0.8rem;
    font-weight: normal;
    opacity: 0.8;
    white-space: nowrap;
    flex-shrink: 0;
}
body.zen-mode .reader-header-actions {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 6px !important;
    flex-shrink: 0 !important;
    white-space: nowrap !important;
}
body.zen-mode #btn-zen-mode {
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    align-self: stretch !important;
    height: 100% !important;
    min-height: 52px !important;
    padding: 0 14px !important;
    font-size: 0.9rem !important;
    font-weight: 700 !important;
    border-radius: 9px !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.25) !important;
    background: linear-gradient(135deg, #334155 0%, #1e293b 100%) !important;
    color: #f1f5f9 !important;
    border: 1px solid rgba(255, 255, 255, 0.18) !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
}
body.zen-mode #btn-zen-mode:hover {
    transform: translateY(-1px) !important;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.35) !important;
    background: linear-gradient(135deg, #475569 0%, #334155 100%) !important;
    border-color: rgba(255, 255, 255, 0.35) !important;
    color: #ffffff !important;
}
body.zen-mode .btn-extract-vocab-row {
    display: none !important;
}
body.zen-mode .zoom-btn {
    width: 28px !important;
    height: 28px !important;
    flex-shrink: 0 !important;
}

body.zen-mode .reader-content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding-bottom: calc(150px + env(safe-area-inset-bottom, 0px)) !important; /* Space for the floating player */
}

/* Floating Web Player in Zen Mode */
body.zen-mode .web-player-actions {
    position: fixed;
    bottom: calc(16px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    width: fit-content;
    max-width: calc(100vw - 16px);
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 6px 25px rgba(0, 0, 0, 0.18);
    padding: 6px 10px !important;
    border-radius: 16px;
    z-index: 100000;
    margin-bottom: 0 !important;
}

.web-player-actions .sentence-controls-wrapper {
    display: none !important;
}

body.zen-mode .web-player-actions .sentence-controls-wrapper {
    display: block !important;
    margin: 0 !important;
    padding: 0 !important;
}

body.zen-mode #reader-sentence-controls {
    display: none !important;
}

body.zen-mode .web-player-actions .sentence-controls {
    margin: 0 !important;
}

.sentence-controls {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 8px !important;
    flex-wrap: nowrap !important;
    margin: 0 auto !important;
}

.sentence-controls > button,
.sentence-controls > select,
.sentence-controls .btn {
    margin: 0 !important;
    flex-shrink: 0 !important;
    white-space: nowrap !important;
    height: 38px !important;
    box-sizing: border-box !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    font-family: inherit !important;
    font-size: 0.86rem !important;
    font-weight: 600 !important;
    border-radius: 8px !important;
    border: 1px solid var(--glass-border) !important;
    background: var(--input-bg, rgba(255, 255, 255, 0.08)) !important;
    color: var(--text-color, #ffffff) !important;
    transition: all 0.2s ease !important;
}

#btn-floating-playpause, #btn-reader-playpause {
    min-width: 46px !important;
    width: 46px !important;
    font-size: 1.1rem !important;
    padding: 0 !important;
    background: var(--primary, #3b82f6) !important;
    color: #ffffff !important;
}

#btn-floating-restart, #btn-reader-restart,
#btn-prev-sentence, #reader-sentence-controls button:nth-child(3),
#btn-next-sentence, #reader-sentence-controls button:nth-child(5),
.sentence-controls .secondary-btn {
    padding: 0 12px !important;
}

#playback-speed-select, #reader-playback-speed-select {
    padding: 0 8px !important;
    min-width: 62px !important;
    text-align: center !important;
    text-align-last: center !important;
    cursor: pointer !important;
}

@media (max-width: 500px) {
    .sentence-controls {
        gap: 6px !important;
    }
    .sentence-controls > button,
    .sentence-controls > select,
    .sentence-controls .btn {
        height: 34px !important;
        font-size: 0.8rem !important;
    }
    #btn-floating-playpause, #btn-reader-playpause {
        min-width: 40px !important;
        width: 40px !important;
        font-size: 1rem !important;
    }
    #btn-floating-restart, #btn-reader-restart,
    #btn-prev-sentence, #reader-sentence-controls button:nth-child(3),
    #btn-next-sentence, #reader-sentence-controls button:nth-child(5),
    .sentence-controls .secondary-btn {
        padding: 0 8px !important;
    }
    #playback-speed-select, #reader-playback-speed-select {
        min-width: 56px !important;
        padding: 0 4px !important;
    }
}

@media (max-width: 360px) {
    .sentence-controls {
        gap: 4px !important;
    }
    #btn-floating-restart, #btn-reader-restart,
    #btn-prev-sentence, #reader-sentence-controls button:nth-child(3),
    #btn-next-sentence, #reader-sentence-controls button:nth-child(5),
    .sentence-controls .secondary-btn {
        padding: 0 6px !important;
    }
}

/* Also make the audio element itself slightly larger and stretch */
body.zen-mode .web-player-actions audio {
    display: none !important;
}

.status-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: -8px;
    margin-bottom: 14px;
}

body.zen-mode .status-indicator {
    display: none !important;
}

/* Sync Lyrics Highlight & Natural Paragraph Layout */
.reader-paragraph {
    margin-bottom: 1.25em;
    line-height: 1.85;
    text-indent: 2em;
    text-align: justify;
    font-size: inherit;
    color: inherit;
}
.lyric-line {
    display: inline;
    border-radius: 4px;
    padding: 2px 2px;
    transition: background-color 0.2s ease, color 0.2s ease;
    cursor: pointer;
    font-weight: inherit;
}
.lyric-line:hover {
    background-color: rgba(0, 0, 0, 0.06);
}
.lyric-line.highlight {
    background-color: var(--glass-border) !important;
    border-radius: 4px;
    font-weight: inherit !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.08);
}
body.dark-theme .lyric-line:hover {
    background-color: rgba(255, 255, 255, 0.1);
}
body.dark-theme .lyric-line.highlight {
    background-color: rgba(255, 255, 255, 0.18) !important;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.3);
}
/* Book Tags (統一內縮於書名底下，增強目錄階層與視覺清晰度) */
.book-tags {
    margin-top: 4px;
    margin-bottom: 6px;
    margin-left: 28px;
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
    align-items: center;
}
.book-tag {
    font-size: 0.74rem;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
    color: #ffffff;
    text-shadow: 0 1px 1px rgba(0,0,0,0.25);
    white-space: nowrap;
    line-height: 1.4;
    letter-spacing: 0.2px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.12);
}
.tag-category {
    background-color: #3b82f6; /* Blue for Main Category */
}
.tag-lcc {
    background-color: #10b981; /* Green for LCC */
}
.tag-subject {
    background-color: #8b5cf6; /* Purple for Subject */
}

/* --- Dropdown Menu & Reader Settings --- */
.settings-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 3000;
    background: rgba(0,0,0,0.45);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem 1rem;
    box-sizing: border-box;
}
.settings-modal-header {
    width: 100%;
    max-width: 680px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.8rem;
    color: white;
    text-shadow: 0 1px 3px rgba(0,0,0,0.5);
    box-sizing: border-box;
}
.settings-modal-header button {
    color: white;
}
.settings-modal-content {
    width: 100%;
    max-width: 680px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 14px;
    border-radius: 16px;
    box-sizing: border-box;
}
@media (max-width: 768px) {
    .settings-modal {
        padding: 0;
        background: var(--bg-color);
    }
    .settings-modal-header {
        padding: 1rem 1rem 0.5rem 1rem;
        margin-bottom: 0;
        background: rgba(0,0,0,0.05);
        color: var(--text-color);
        text-shadow: none;
    }
    .settings-modal-header button {
        color: var(--text-color);
    }
    .settings-modal-content {
        border-radius: 0;
        padding: 0.8rem 0.8rem 2rem 0.8rem;
        box-shadow: none;
        background: transparent;
        gap: 12px;
    }
}

/* Settings Group Cards (Clear Visual Hierarchy) */
.settings-section-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    box-sizing: border-box;
    transition: all 0.2s ease;
}
body.light-theme .settings-section-card {
    background: rgba(0, 0, 0, 0.02);
}

.settings-section-header {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--primary);
    padding-bottom: 8px;
    margin-bottom: 6px;
    border-bottom: 1px solid var(--glass-border);
    letter-spacing: 0.3px;
}

.settings-sub-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-muted);
    margin: 8px 0 4px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.settings-sub-header:first-of-type {
    margin-top: 2px;
}

.settings-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 14px;
    margin-bottom: 4px;
}
@media (max-width: 520px) {
    .settings-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

.menu-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    margin-bottom: 0px;
}
.menu-item label {
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--text-color);
}
.menu-item select {
    width: 100%;
    margin: 0;
    font-size: 0.86rem;
    padding: 7px 10px;
    border-radius: 8px;
    box-sizing: border-box;
}

.system-tools-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 4px;
}
@media (max-width: 520px) {
    .system-tools-grid {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

.menu-btn {
    width: 100%;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    box-shadow: none;
    padding: 9px 14px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.88rem;
    cursor: pointer;
    color: var(--text-color);
    box-sizing: border-box;
    transition: all 0.2s ease;
}
.menu-btn:hover {
    background: var(--glass-border);
    transform: translateY(-1px);
    border-color: var(--primary);
}

.reader-preview {
    position: relative;
    padding: 22px 14px 12px 14px;
    border-radius: 8px;
    border: 1px dashed var(--glass-border);
    margin-top: 8px;
    margin-bottom: 4px;
    font-size: 0.92rem;
    line-height: 1.6;
    text-align: left;
    background: var(--input-bg);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.05);
    transition: all 0.2s ease;
    color: var(--text-color);
    box-sizing: border-box;
}


.reader-container {
    position: relative;
}

.virtual-scroll-container {
    position: absolute;
    bottom: 195px;
    right: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 999;
}
body.zen-mode .virtual-scroll-container {
    position: fixed !important;
    bottom: calc(85px + env(safe-area-inset-bottom, 0px)) !important;
    right: 16px !important;
    z-index: 10001 !important;
}
.scroll-btn {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-color);
    font-size: 0.95rem;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    transition: all 0.2s ease;
    opacity: 0.88;
}
.scroll-btn:hover {
    background: var(--input-bg);
    opacity: 1;
    transform: translateY(-2px);
}
.scroll-btn:active {
    transform: translateY(0);
}


/* Nuclear option to completely eradicate all browser default bullets */
ul, li {
    list-style: none !important;
    list-style-type: none !important;
}

.tree-dir, .folder-item {
    scroll-margin-top: 180px;
}


/* Dictionary Tooltip */
.dict-tooltip {
    position: absolute;
    z-index: 10000;
    width: 300px;
    max-width: 90vw;
    padding: 1rem;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    border: 1px solid var(--glass-border);
    transition: opacity 0.2s ease, transform 0.2s ease;
    pointer-events: auto; /* allow scrolling if definition is long */
    font-size: 0.95rem;
    line-height: 1.4;
    border-radius: 8px;
}
.dict-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 5px;
}
.dict-phonetic {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
    font-family: monospace;
}
.dict-translation {
    font-weight: bold;
    color: var(--text-color);
    margin-bottom: 8px;
    white-space: pre-wrap;
}
.dict-definition {
    color: var(--text-muted);
    font-size: 0.85rem;
    white-space: pre-wrap;
    max-height: 150px;
    overflow-y: auto;
}


/* Fix for mobile floating player */
@media (max-width: 768px) {
    body.zen-mode .web-player-actions audio {
        width: calc(100vw - 80px) !important;
        margin-right: auto;
    }
}

/* Vocab Flashcards */
.vocab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 15px; margin-top: 15px; }

.vocab-card {
    height: 320px; /* Taller for more content */
}
.vocab-def {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 10px;
    text-align: left;
    max-height: 120px;
    overflow-y: auto;
    padding-right: 5px;
}
.vocab-footer {
    position: absolute;
    bottom: 10px;
    left: 10px;
    right: 10px;
    font-size: 0.75rem;
    color: rgba(150, 150, 150, 0.8);
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    border-top: 1px solid rgba(150, 150, 150, 0.2);
    padding-top: 5px;
}
.vocab-footer-info {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.vocab-card { /* Original */ perspective: 1000px; height: 180px; cursor: pointer; }
.vocab-card-inner { position: relative; width: 100%; height: 100%; text-align: center; transition: transform 0.6s cubic-bezier(0.4, 0.2, 0.2, 1); transform-style: preserve-3d; }
.vocab-card.flipped .vocab-card-inner { transform: rotateY(180deg); }
.vocab-card-front, .vocab-card-back { position: absolute; width: 100%; height: 100%; -webkit-backface-visibility: hidden; backface-visibility: hidden; display: flex; flex-direction: column; justify-content: center; align-items: center; border-radius: 12px; padding: 10px; box-sizing: border-box; background: rgba(255, 255, 255, 0.05); border: 1px solid var(--glass-border); box-shadow: 0 4px 6px rgba(0,0,0,0.1); }
.vocab-card-back { transform: rotateY(180deg); background: rgba(0, 0, 0, 0.1); }
.vocab-word { font-size: 1.2rem; font-weight: bold; }
.vocab-phonetic { font-size: 0.85rem; color: var(--text-muted); margin-top: 5px; }
.vocab-trans { font-size: 0.9rem; margin-top: 8px; color: var(--primary-color); }
.vocab-delete { position: absolute; bottom: 5px; right: 5px; background: transparent; border: none; color: var(--danger); font-size: 1.2rem; cursor: pointer; opacity: 0.5; }
.vocab-delete:hover { opacity: 1; }


/* --- New Vocabulary Modes --- */
.vocab-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 15px;
}
.vocab-list-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 10px;
    padding: 14px 16px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    text-align: left;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.vocab-list-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: rgba(255, 255, 255, 0.2);
}
.vocab-list-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}
.vocab-list-word-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    font-size: 1.25rem;
    font-weight: 700;
}
.vocab-list-word {
    color: var(--text-color);
    word-break: break-word;
}
.vocab-list-num {
    color: var(--primary-color);
    font-weight: bold;
}
.vocab-list-subrow {
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 2px 0 4px 0;
}
.vocab-list-body {
    padding-left: 8px;
}
.vocab-card-static {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 12px 14px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
    height: 180px;
    cursor: pointer;
    position: relative;
    text-align: left;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
    touch-action: manipulation;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.vocab-card-static:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0,0,0,0.25);
    background: rgba(255, 255, 255, 0.08);
}
.vocab-card-static:active {
    transform: scale(0.98);
}
.vocab-card-static .vocab-delete {
    bottom: 8px;
    right: 10px;
    top: auto;
}
.vocab-card-static-content {
    flex: 1;
    overflow: hidden;
}
.vocab-card-static-trans {
    font-size: 0.92rem;
    margin-top: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
}
.vocab-card-static-def {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.35;
}
@media (max-width: 600px) {
    .vocab-card-static {
        height: 200px;
    }
    .vocab-card-static-def {
        -webkit-line-clamp: 3;
    }
}

#vocab-modal {
    background: rgba(0,0,0,0.6);
}
#vocab-modal .settings-modal-header {
    width: 92%;
    max-width: 520px;
    margin: 0 auto 10px auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#vocab-modal .settings-modal-body {
    background-color: var(--glass-bg);
    color: var(--text-color);
    border-radius: 14px;
    width: 92%;
    max-width: 520px;
    margin: 0 auto;
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

.controls-wrapper button {
    transition: transform 0.1s ease, filter 0.15s ease;
}
.controls-wrapper #btn-start {
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.3px;
    white-space: nowrap;
    text-overflow: ellipsis;
}
@media (max-width: 480px) {
    .controls-wrapper #btn-start {
        font-size: clamp(0.72rem, 3.2vw, 0.88rem) !important;
        padding: 0 4px !important;
    }
    .controls-wrapper #btn-toggle-playlist,
    .controls-wrapper #btn-next-random {
        font-size: clamp(0.8rem, 3.2vw, 0.92rem) !important;
        padding: 0 4px !important;
    }
}

/* Controls & Playback Mode Styling */
.controls-wrapper .secondary-btn {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
}
.controls-wrapper .secondary-btn:hover {
    background: var(--glass-border);
    border-color: var(--primary);
}

.playback-options {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
}
.playback-mode-pill {
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-color);
    padding: 6px 14px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}
.playback-mode-pill:hover {
    border-color: var(--primary);
}
.playback-mode-pill label {
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color);
    margin: 0;
}
.playback-mode-pill input[type="radio"] {
    accent-color: var(--primary);
    cursor: pointer;
}
.playback-mode-pill strong {
    color: var(--text-color);
    font-weight: 600;
    transition: color 0.2s ease;
}
.playback-mode-pill input[type="radio"]:checked ~ strong,
.playback-mode-pill label:has(input[type="radio"]:checked) strong {
    color: var(--primary);
}
.sleep-timer-wrapper select {
    color: var(--text-color);
}
.sleep-timer-wrapper select option {
    background: var(--bg-color);
    color: var(--text-color);
}

/* Display reader controls in Zen Mode as fixed floating bottom player bar */
body.zen-mode #reader-sentence-controls {
    display: flex !important;
    position: fixed !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    z-index: 10000 !important;
    background: var(--glass-bg, rgba(15, 23, 42, 0.92)) !important;
    backdrop-filter: blur(16px) !important;
    -webkit-backdrop-filter: blur(16px) !important;
    border-top: 1px solid var(--glass-border) !important;
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.35) !important;
    padding: 8px 12px calc(8px + env(safe-area-inset-bottom, 0px)) 12px !important;
    justify-content: center !important;
    align-items: center !important;
}

body.zen-mode .reader-content-wrapper {
    padding-bottom: calc(90px + env(safe-area-inset-bottom, 0px)) !important;
}


/* Vocab Context Quote Styling */
.vocab-context-quote {
    color: var(--text-color);
    border-left: 3px solid #10b981;
    background: rgba(16, 185, 129, 0.08);
    padding: 10px 10px 10px 12px;
    border-radius: 0 8px 8px 0;
    line-height: 1.6;
    font-family: var(--font-family);
    position: relative;
    text-shadow: 0 0 1px rgba(0,0,0,0.1);
}
.vocab-context-quote strong {
    color: var(--text-color);
    background: rgba(245, 158, 11, 0.2);
    padding: 0 4px;
    border-radius: 4px;
}

.vocab-def-line {
    margin-bottom: 6px;
    padding-left: 1.8em !important;
    text-indent: -1.8em !important;
    line-height: 1.6 !important;
    word-break: break-word;
    display: block;
}



/* Quiz Mode Styles */
.quiz-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-color);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto;
}

.quiz-close-btn {
    position: absolute;
    top: 15px; right: 20px;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--text-color);
    cursor: pointer;
    opacity: 0.6;
    transition: 0.2s;
    z-index: 10000;
}
.quiz-close-btn:hover { opacity: 1; transform: scale(1.1); }

.quiz-header {
    flex-shrink: 0;
    text-align: center;
    margin-bottom: 20px;
    margin-top: 10px;
}
.quiz-header h2 { margin: 0 0 10px 0; color: var(--primary-color); }

.quiz-progress-bar-container {
    width: 100%;
    max-width: 600px;
    height: 6px;
    background: rgba(150, 150, 150, 0.2);
    border-radius: 3px;
    margin: 0 auto;
    overflow: hidden;
}
.quiz-progress-bar {
    height: 100%;
    background: var(--primary-color);
    width: 0%;
    transition: width 0.3s ease;
}
.quiz-progress {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.quiz-body {
    flex: 1 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
}

.quiz-card-container {
    width: 100%;
    max-width: 600px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    text-align: center;
}

.quiz-word-text {
    font-size: 3.5rem;
    font-weight: bold;
    margin: 0 0 10px 0;
    word-break: break-word;
    color: var(--text-color);
}
.quiz-phonetic-text {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 15px;
}
.quiz-audio-btn {
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid rgba(16, 185, 129, 0.4);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    font-size: 1.5rem;
    cursor: pointer;
    transition: 0.2s;
    color: var(--text-color);
}
.quiz-audio-btn:hover { background: rgba(16, 185, 129, 0.3); transform: scale(1.05); }

.quiz-divider {
    border: 0;
    border-top: 1px dashed rgba(150, 150, 150, 0.3);
    margin: 25px 0;
}

.quiz-trans-text {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 10px;
    color: var(--text-color);
}
.quiz-def-text {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.quiz-footer {
    flex-shrink: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px 0;
}
.quiz-action-btn {
    font-size: 1.2rem;
    padding: 12px 30px;
    border-radius: 25px;
    width: 100%;
    max-width: 300px;
}
.quiz-assess-btns {
    display: flex;
    gap: 15px;
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
}
.quiz-assess-btn {
    flex: 0 1 auto;
    min-width: 120px;
    padding: 10px 20px;
    font-size: 1.05rem;
    border-radius: 12px;
}

/* Chapter Vocab Extraction Modal Styling */
#extract-vocab-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 3000;
    background: rgba(0,0,0,0.65);
    backdrop-filter: blur(8px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 16px;
    box-sizing: border-box;
    overflow: hidden;
}
#extract-vocab-modal .extract-vocab-container {
    width: 100%;
    max-width: 560px;
    max-height: calc(100vh - 32px);
    background: var(--bg-color);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 16px 36px rgba(0,0,0,0.35);
    box-sizing: border-box;
}
#extract-vocab-modal .settings-modal-header {
    flex-shrink: 0;
}
#extract-vocab-modal .extract-vocab-scroll-body {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    -webkit-overflow-scrolling: touch;
}
#extract-vocab-modal .extract-vocab-footer {
    padding: 12px 16px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    flex-shrink: 0;
    width: 100%;
    box-sizing: border-box;
}
@media (max-width: 768px) {
    #extract-vocab-modal {
        padding: 8px;
    }
    #extract-vocab-modal .extract-vocab-container {
        max-height: calc(100vh - 16px);
        border-radius: 12px;
    }
}

.tag-chip {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 10px;
    background: var(--input-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
}
.tag-chip:has(input:checked) {
    background: rgba(59, 130, 246, 0.15);
    border-color: #3b82f6;
    color: var(--text-color);
    font-weight: 600;
}
.tag-chip input[type="checkbox"] {
    cursor: pointer;
    accent-color: #3b82f6;
}
.extract-vocab-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 8px 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    font-size: 0.88rem;
    transition: background 0.2s ease;
}
.extract-vocab-item:hover {
    background: var(--input-bg);
}
.extract-vocab-item input[type="checkbox"] {
    margin-top: 4px;
    cursor: pointer;
    accent-color: #10b981;
}

/* Reader bottom floating bar fixes and uniformity for all devices */
.sentence-controls-wrapper {
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.btn-extract-vocab-row {
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.btn-extract-vocab-action {
    padding: 6px 14px !important;
    font-size: 0.85rem !important;
    height: 34px !important;
    border-radius: 10px !important;
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    gap: 5px !important;
    background: rgba(59, 130, 246, 0.12) !important;
    color: var(--text-color) !important;
    border: 1px solid rgba(59, 130, 246, 0.35) !important;
    cursor: pointer !important;
    transition: all 0.2s ease !important;
}
.btn-extract-vocab-action:hover {
    background: rgba(59, 130, 246, 0.22) !important;
}
.btn-extract-vocab-action.btn-dl-txt {
    background: rgba(16, 185, 129, 0.12) !important;
    border-color: rgba(16, 185, 129, 0.35) !important;
}
.btn-extract-vocab-action.btn-dl-txt:hover {
    background: rgba(16, 185, 129, 0.22) !important;
}
.btn-extract-vocab-action.btn-dl-mp3 {
    background: rgba(139, 92, 246, 0.12) !important;
    border-color: rgba(139, 92, 246, 0.35) !important;
}
.btn-extract-vocab-action.btn-dl-mp3:hover {
    background: rgba(139, 92, 246, 0.22) !important;
}

/* Chapter Translation Modal Layer */
#chapter-translate-modal {
    background: rgba(0,0,0,0.65);
    padding: 1rem;
    z-index: 3500;
}
#chapter-translate-modal .translate-modal-container {
    width: 100%;
    max-width: 680px;
    background: var(--bg-color);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    max-height: calc(100vh - 40px);
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0,0,0,0.35);
}
#chapter-translate-modal .translate-modal-scroll-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px;
    font-size: 1.1rem;
    line-height: 2.1;
    color: var(--text-color);
    -webkit-overflow-scrolling: touch;
}
.translate-paragraph {
    text-indent: 2em;
    margin-bottom: 14px;
    line-height: 2.0;
    letter-spacing: 0.5px;
    text-align: justify;
}
.translate-paragraph:last-child {
    margin-bottom: 0;
}
.translate-bilingual-item {
    margin-bottom: 16px;
    padding: 12px 14px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    transition: background 0.2s ease;
}
.translate-bilingual-item:hover {
    background: var(--input-bg);
}
.translate-en-line {
    font-size: 1.02rem;
    font-weight: 500;
    color: var(--text-color);
    line-height: 1.65;
    margin-bottom: 8px;
}
.translate-zh-line {
    font-size: 1.05rem;
    color: #10b981;
    line-height: 1.75;
    padding-left: 2px;
}
.translate-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    animation: spin-translate 0.8s linear infinite;
}
@keyframes spin-translate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}
.translate-loading-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 50px 20px;
    color: var(--text-muted);
    gap: 14px;
}

@media (max-width: 768px) {
    .btn-extract-vocab-action {
        padding: 5px 14px !important;
        font-size: 0.82rem !important;
        height: 32px !important;
    }
}

/* Gesture Controls Styles */
.no-select {
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}
.loop-active {
    box-shadow: 0 0 8px 2px orange !important;
    border-color: orange !important;
}

/* Reading Contribution Heatmap */
.heatmap-grid {
    display: grid;
    grid-template-rows: repeat(7, 12px);
    grid-auto-flow: column;
    grid-auto-columns: 12px;
    gap: 2px;
    overflow-x: auto;
    padding: 6px 2px;
    justify-content: start;
    -webkit-overflow-scrolling: touch;
}
.heat-cell {
    width: 12px;
    height: 12px;
    border-radius: 2px;
    cursor: pointer;
    transition: transform 0.15s ease;
    box-sizing: border-box;
}
.heat-cell:hover {
    transform: scale(1.35);
    z-index: 5;
    box-shadow: 0 0 4px rgba(0,0,0,0.5);
}
.heat-cell.lvl-0 {
    background-color: rgba(200, 200, 200, 0.2);
    border: 1px solid rgba(150, 150, 150, 0.15);
}
.heat-cell.lvl-1 { background-color: #9be9a8; }
.heat-cell.lvl-2 { background-color: #40c463; }
.heat-cell.lvl-3 { background-color: #30a14e; }
.heat-cell.lvl-4 { background-color: #216e39; }

/* Reader View Mode Switcher Toolbar */
.reader-mode-toolbar {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(0, 0, 0, 0.03);
    border-bottom: 1px solid var(--glass-border);
    align-items: center;
}
body.dark-theme .reader-mode-toolbar {
    background: rgba(255, 255, 255, 0.03);
}
.reader-mode-group, .reader-download-group {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-wrap: nowrap;
}
.reader-mode-btn {
    padding: 2px 8px !important;
    font-size: 0.78rem !important;
    height: 26px !important;
    border-radius: 6px !important;
    font-weight: 600;
    transition: all 0.2s ease;
    border: 1px solid var(--glass-border);
    display: inline-flex !important;
    align-items: center !important;
    justify-content: center !important;
    white-space: nowrap !important;
    flex-shrink: 0 !important;
    cursor: pointer;
}
.reader-mode-btn.active {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%) !important;
    color: #ffffff !important;
    border: none !important;
    box-shadow: 0 2px 6px rgba(16, 185, 129, 0.3);
}
.download-btn {
    padding: 4px 12px !important;
    font-size: 0.82rem !important;
    border-radius: 8px !important;
    font-weight: 600;
    transition: all 0.2s ease;
    border: 1px solid var(--glass-border);
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.download-btn:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}


/* Bilingual Sentence Layout (No outer borders, compact and natural) */
.bilingual-pair-card {
    margin-bottom: 1.15em;
    padding: 0;
    background: transparent;
    border: none;
}
.bilingual-en-line {
    display: block;
    font-size: 1.02em;
    line-height: 1.8;
    margin-bottom: 2px;
    color: var(--text-color);
    text-indent: 2em;
    text-align: justify;
    border-radius: 4px;
    transition: background-color 0.2s ease;
}
.bilingual-zh-line {
    display: block;
    font-size: 0.96em;
    line-height: 1.8;
    color: #16a34a; /* Elegant emerald green for Chinese translation */
    text-indent: 2em;
    text-align: justify;
    opacity: 0.95;
    margin-bottom: 4px;
}
body.dark-theme .bilingual-zh-line {
    color: #4ade80;
}

/* Chinese-only mode paragraph */
.chinese-reader-paragraph {
    display: block;
    text-indent: 2em;
    line-height: 2.0;
    margin-bottom: 0.95em;
    text-align: justify;
    font-size: 1.05em;
    color: var(--text-color);
}

/* Amber Gold Synced Link Icon */
.icon-sync-amber {
    display: inline-block;
    width: 18px;
    height: 18px;
    vertical-align: -3px;
    margin-left: 3px;
    margin-right: 5px;
    fill: #f59e0b;
    transform: rotate(-45deg);
    filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.7));
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), filter 0.25s ease;
}
.tree-dir:hover .icon-sync-amber {
    transform: rotate(-45deg) scale(1.22);
    filter: drop-shadow(0 0 7px rgba(245, 158, 11, 1));
}

/* Top-level Sync vs Unsynced Category Folders */
.sync-section-folder {
    list-style-type: none;
    margin-bottom: 14px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    overflow: hidden;
    transition: all 0.25s ease;
}
.sync-section-folder,
#group-synced-section,
#group-unsynced-section {
    scroll-margin-top: 140px;
}
.sync-section-folder > span,
#group-synced-header,
#group-unsynced-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 1.2rem;
    font-weight: 700;
    padding: 12px 16px;
    cursor: pointer;
    user-select: none;
    transition: all 0.2s ease;
    min-height: 48px;
    scroll-margin-top: 140px;
}
.sync-section-folder.synced-section > span {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.20), rgba(245, 158, 11, 0.04));
    color: #f59e0b;
    border-left: 5px solid #f59e0b;
}
.sync-section-folder.synced-section > span:hover {
    background: linear-gradient(90deg, rgba(245, 158, 11, 0.30), rgba(245, 158, 11, 0.08));
    filter: brightness(1.1);
}
.sync-section-folder.unsynced-section > span {
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.16), rgba(59, 130, 246, 0.03));
    color: #60a5fa;
    border-left: 5px solid #3b82f6;
}
.sync-section-folder.unsynced-section > span:hover {
    background: linear-gradient(90deg, rgba(59, 130, 246, 0.26), rgba(59, 130, 246, 0.07));
    filter: brightness(1.1);
}
.sync-section-folder.expanded > span {
    border-bottom: 1px solid var(--glass-border);
}
.sync-section-folder > .tree-container {
    padding: 8px 10px 10px 14px;
}

@keyframes sectionTargetGlow {
    0% { filter: brightness(1); outline: 2px solid transparent; }
    30% { filter: brightness(1.28); outline: 2px solid var(--primary, #3b82f6); box-shadow: 0 0 16px rgba(59, 130, 246, 0.45); }
    70% { filter: brightness(1.15); outline: 2px solid var(--primary, #3b82f6); box-shadow: 0 0 10px rgba(59, 130, 246, 0.25); }
    100% { filter: brightness(1); outline: 2px solid transparent; box-shadow: none; }
}
.section-target-highlight {
    animation: sectionTargetGlow 1.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    border-radius: 8px;
}

/* Login Action Buttons (Dynamic Theme Harmony) */
.login-action-btn {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%) !important;
    border: 1px solid rgba(255, 255, 255, 0.2) !important;
    color: #ffffff !important;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.18), 0 2px 6px rgba(0, 0, 0, 0.12) !important;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1) !important;
}
.login-action-btn:hover {
    background: linear-gradient(135deg, var(--primary-hover) 0%, var(--primary) 100%) !important;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25) !important;
}
.login-action-btn:active {
    transform: translateY(1px);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15) !important;
}

/* Vocab Loop Active Card Highlight & Animation */
.vocab-card-static.active-vocab-playing,
.vocab-list-item.active-vocab-playing {
    border-color: var(--primary) !important;
    box-shadow: 0 0 0 2px var(--primary), 0 4px 18px rgba(59, 130, 246, 0.35) !important;
    transform: scale(1.025);
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    background: rgba(59, 130, 246, 0.12) !important;
    z-index: 5;
    position: relative;
}

/* 典籍播放目錄專屬大區塊巡航浮動按鈕 */
.playlist-scroll-container {
    position: fixed;
    bottom: 24px;
    right: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 99;
}

.scroll-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.15rem;
    font-weight: bold;
    cursor: pointer;
    user-select: none;
    border: 1.5px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-color);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-btn:hover {
    transform: translateY(-2px) scale(1.08);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
    background: var(--primary);
    color: #ffffff;
    border-color: rgba(255, 255, 255, 0.35);
}

.scroll-btn:active {
    transform: translateY(1px) scale(0.94);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

/* 區塊巡航提示浮動泡泡 (Cruise Toast) */
.scroll-cruise-toast {
    position: fixed;
    bottom: 34px;
    right: 72px;
    background: rgba(15, 23, 42, 0.92);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    color: #f8fafc;
    font-size: 0.88rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
    z-index: 1000;
    opacity: 0;
    transform: translateX(12px) scale(0.92);
    transition: opacity 0.22s ease, transform 0.22s cubic-bezier(0.2, 0.8, 0.2, 1);
    pointer-events: none;
    white-space: nowrap;
}

.scroll-cruise-toast.show {
    opacity: 1;
    transform: translateX(0) scale(1);
}

/* ==========================================================================
   2026 Bento Grid & Spotlight Showcase UI Styles (High Contrast & Solid)
   ========================================================================== */
.bento-section {
    margin-bottom: 2rem;
    width: 100%;
}

.bento-nav-tabs {
    display: inline-flex;
    background: var(--dropdown-bg, #ffffff);
    padding: 5px;
    border-radius: 14px;
    border: 1.5px solid var(--glass-border);
    margin-bottom: 1.2rem;
    gap: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.bento-nav-tab {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: 0.92rem;
    font-weight: 700;
    border-radius: 10px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all 0.2s ease;
}

.bento-nav-tab.active {
    background: var(--primary);
    color: #ffffff !important;
    box-shadow: 0 3px 12px rgba(234, 88, 12, 0.4);
}

.bento-refresh-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    margin-left: 3px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.22);
    color: #ffffff;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    flex-shrink: 0;
    border: 1px solid rgba(255, 255, 255, 0.35);
}

.bento-refresh-icon-btn:hover {
    background: rgba(255, 255, 255, 0.4);
    transform: scale(1.15);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.5);
}

.bento-refresh-icon-btn:active {
    transform: scale(0.92);
}

.bento-refresh-icon-btn.spinning svg,
.bento-refresh-icon-btn.spinning .bento-refresh-svg {
    animation: bento-spin-refresh 0.65s cubic-bezier(0.4, 0, 0.2, 1);
}

@keyframes bento-spin-refresh {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 12px;
    margin-bottom: 1.4rem;
}

.bento-card {
    background: var(--dropdown-bg, #ffffff);
    border: 1.5px solid var(--glass-border);
    border-radius: 16px;
    padding: 0.85rem 1rem;
    cursor: pointer;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    position: relative;
    user-select: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
    text-decoration: none;
    color: inherit;
}

.bento-category-card {
    background: var(--dropdown-bg, #ffffff);
    border: 1.5px solid var(--glass-border);
    border-radius: 16px;
    padding: 1rem 1.15rem;
    cursor: pointer;
    transition: all 0.22s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    justify-content: space-between;
    position: relative;
    user-select: none;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.08);
}

.bento-card:hover, .bento-category-card:hover {
    transform: translateY(-3px);
    border-color: var(--primary);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.16);
}

.bento-card.active {
    border: 2.2px solid var(--primary) !important;
    background: var(--dropdown-bg, #ffffff) !important;
    box-shadow: 0 0 0 1.5px var(--primary), 0 8px 25px rgba(234, 88, 12, 0.3) !important;
}

.bento-category-card.active {
    border: 2.2px solid #10b981 !important;
    background: var(--dropdown-bg, #ffffff) !important;
    box-shadow: 0 0 0 1.5px #10b981, 0 8px 25px rgba(16, 185, 129, 0.3) !important;
}

/* Bento Card Cover Thumbnail */
.bento-card-cover-wrap {
    flex-shrink: 0;
    width: 50px;
    height: 72px;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(0, 0, 0, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.22s ease, box-shadow 0.22s ease;
}

.bento-card:hover .bento-card-cover-wrap {
    transform: scale(1.05) rotate(-1deg);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.35);
}

.bento-card.active .bento-card-cover-wrap {
    box-shadow: 0 0 14px rgba(234, 88, 12, 0.45);
    border-color: var(--primary);
}

.bento-card-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.bento-card-info {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.bento-card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 4px;
}

.bento-card-title, .bento-category-card .bento-card-title {
    font-size: 0.96rem;
    font-weight: 800;
    color: var(--text-color) !important;
    line-height: 1.3;
}

.bento-card-sub, .bento-category-card .bento-card-sub {
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-color) !important;
    opacity: 0.85;
    margin-top: 3px;
    line-height: 1.35;
}

.bento-card-footer, .bento-category-card .bento-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--primary) !important;
    opacity: 0.9;
}

.bento-badge-active, .bento-cat-badge-active {
    font-size: 0.74rem;
    font-weight: 800;
    color: #047857;
    background: rgba(16, 185, 129, 0.2);
    border: 1.2px solid #10b981;
    padding: 3px 8px;
    border-radius: 20px;
    display: none;
}

.bento-card.active .bento-badge-active,
.bento-category-card.active .bento-cat-badge-active {
    display: inline-block;
}

/* Spotlight Card (Split Layout) */
.spotlight-card {
    background: var(--dropdown-bg, #ffffff);
    border: 1.5px solid var(--glass-border);
    border-radius: 20px;
    padding: 1.6rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 1.5rem;
    align-items: center;
}

@media (max-width: 700px) {
    .spotlight-card {
        grid-template-columns: 1fr;
        gap: 1.2rem;
        padding: 1.2rem;
    }
}

/* Spotlight Showcase Row (Cover + Meta) */
.spotlight-showcase-row {
    display: flex;
    align-items: center;
    gap: 1.25rem;
    margin-bottom: 1.1rem;
}

@media (max-width: 480px) {
    .spotlight-showcase-row {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

.spotlight-cover-wrap {
    position: relative;
    flex-shrink: 0;
    width: 84px;
    height: 122px;
    border-radius: 12px;
}

.spotlight-cover-glow {
    position: absolute;
    inset: -6px;
    width: calc(100% + 12px);
    height: calc(100% + 12px);
    object-fit: cover;
    filter: blur(14px);
    opacity: 0.55;
    border-radius: 16px;
    z-index: 1;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.spotlight-cover-img {
    position: relative;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    border: 1.5px solid rgba(255, 255, 255, 0.25);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.35);
    z-index: 2;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
}

.spotlight-header-meta {
    flex: 1;
    min-width: 0;
}

.spotlight-pill-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: rgba(16, 185, 129, 0.16);
    border: 1.2px solid #10b981;
    color: #047857;
    font-size: 0.8rem;
    font-weight: 800;
    padding: 3px 10px;
    border-radius: 20px;
    margin-bottom: 6px;
}

.spotlight-title {
    font-size: 1.35rem;
    font-weight: 800;
    font-family: 'Lora', 'Merriweather', 'Noto Serif TC', serif;
    color: var(--primary);
    margin: 0 0 3px 0;
    line-height: 1.25;
}

.spotlight-subtitle {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 6px;
}

.spotlight-desc {
    font-size: 0.84rem;
    color: var(--text-color);
    opacity: 0.85;
    line-height: 1.5;
    margin-bottom: 0;
}

.spotlight-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    align-items: center;
}

.btn-spotlight-cta {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #ffffff !important;
    font-size: 0.95rem;
    font-weight: 700;
    padding: 0.65rem 1.4rem;
    border-radius: 12px;
    border: none;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.45);
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.btn-spotlight-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 22px rgba(99, 102, 241, 0.6);
}

/* Stats Bento Box */
.spotlight-stats-box {
    background: var(--input-bg, rgba(0, 0, 0, 0.05));
    border: 1.5px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.2rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.spotlight-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
    text-align: center;
}

.spotlight-stat-item {
    background: var(--dropdown-bg, #ffffff);
    border-radius: 10px;
    padding: 8px 4px;
    border: 1px solid var(--glass-border);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.spotlight-stat-val {
    font-size: 1.1rem;
    font-weight: 800;
    color: var(--text-color);
}

.spotlight-stat-label {
    font-size: 0.74rem;
    font-weight: 600;
    color: var(--text-muted);
    margin-top: 2px;
}

.spotlight-progress-wrapper {
    margin-top: 4px;
}

.spotlight-progress-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    font-weight: 700;
    color: var(--text-color);
    margin-bottom: 5px;
}

.spotlight-progress-bar {
    width: 100%;
    height: 7px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
    overflow: hidden;
}

.spotlight-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), #10b981);
    width: 0%;
    transition: width 0.3s ease;
}

/* ==========================================================================
   2026 Split-Hero Ambient Glow & Mac Window Showcase
   ========================================================================== */
body {
    background-color: var(--bg-color);
    background-image: 
        radial-gradient(circle at 65% -10%, rgba(99, 102, 241, 0.25) 0%, rgba(59, 130, 246, 0.12) 35%, transparent 65%),
        radial-gradient(circle at 20% 40%, rgba(234, 88, 12, 0.08) 0%, transparent 45%),
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: auto, auto, 36px 36px, 36px 36px;
    background-attachment: fixed;
}

:root[data-theme="sepia"] body {
    background-image: 
        radial-gradient(circle at 65% -10%, rgba(217, 119, 6, 0.18) 0%, rgba(180, 83, 9, 0.08) 35%, transparent 65%),
        radial-gradient(circle at 20% 40%, rgba(108, 122, 82, 0.08) 0%, transparent 45%),
        linear-gradient(rgba(0, 0, 0, 0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.025) 1px, transparent 1px);
    background-size: auto, auto, 36px 36px, 36px 36px;
}

:root[data-theme="light"] body {
    background-image: 
        radial-gradient(circle at 65% -10%, rgba(59, 130, 246, 0.15) 0%, rgba(139, 92, 246, 0.08) 35%, transparent 65%),
        radial-gradient(circle at 20% 40%, rgba(244, 63, 94, 0.05) 0%, transparent 45%),
        linear-gradient(rgba(0, 0, 0, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
    background-size: auto, auto, 36px 36px, 36px 36px;
}

.hero-split-container {
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 1.8rem;
    align-items: start;
    margin-bottom: 2rem;
    width: 100%;
}

@media (max-width: 1060px) {
    .hero-split-container {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

.hero-left-col {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.hero-right-col {
    display: flex;
    flex-direction: column;
    min-width: 0;
    position: sticky;
    top: 16px;
    z-index: 15;
}

.hero-pill-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: rgba(16, 185, 129, 0.15);
    border: 1.2px solid #10b981;
    color: #047857;
    font-size: 0.82rem;
    font-weight: 800;
    padding: 4px 12px;
    border-radius: 20px;
    width: fit-content;
    margin-bottom: 1rem;
    box-shadow: 0 0 14px rgba(16, 185, 129, 0.25);
}

:root[data-theme="dark"] .hero-pill-badge,
:root[data-theme="ocean"] .hero-pill-badge {
    color: #34d399;
}

.hero-main-title {
    font-size: clamp(2rem, 3.8vw, 2.75rem);
    font-weight: 900;
    font-family: 'Lora', 'Merriweather', 'Noto Serif TC', serif;
    color: var(--text-color);
    line-height: 1.22;
    margin: 0 0 1rem 0;
    letter-spacing: -0.3px;
}

.hero-main-title .gradient-text {
    background: linear-gradient(135deg, var(--primary), #8b5cf6, #3b82f6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-lead-desc {
    font-size: 1.02rem;
    color: var(--text-color);
    opacity: 0.88;
    line-height: 1.65;
    margin-bottom: 1.5rem;
}

/* ==========================================================================
   2026 Luxury Stats Banner (精讀書庫 & 泛讀書庫 雙旗艦圓餅統計卡)
   ========================================================================== */
.hero-stats-banner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 1.5rem;
    width: 100%;
}

@media (max-width: 580px) {
    .hero-stats-banner {
        grid-template-columns: 1fr;
        gap: 10px;
    }
}

.stat-lux-card {
    background: var(--dropdown-bg, #ffffff);
    border: 1.5px solid var(--glass-border);
    border-radius: 16px;
    padding: 0.85rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 7px;
    cursor: pointer;
    position: relative;
    user-select: none;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
    overflow: hidden;
    min-width: 0;
}

.stat-lux-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3.5px;
    opacity: 0.9;
    transition: opacity 0.2s;
}

.stat-lux-card.gold-theme::before {
    background: linear-gradient(90deg, #f59e0b, #ea580c);
}

.stat-lux-card.blue-theme::before {
    background: linear-gradient(90deg, #0ea5e9, #6366f1);
}

.stat-lux-card:hover {
    transform: translateY(-3px);
}

.stat-lux-card.gold-theme:hover {
    border-color: #f59e0b;
    box-shadow: 0 10px 28px rgba(245, 158, 11, 0.25);
}

.stat-lux-card.blue-theme:hover {
    border-color: #3b82f6;
    box-shadow: 0 10px 28px rgba(59, 130, 246, 0.25);
}

/* 頂部列：圓環 + 數量/標籤 */
.stat-lux-top-row {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    width: 100%;
}

.stat-lux-chart-wrap {
    position: relative;
    width: 48px;
    height: 48px;
    flex-shrink: 0;
}

.stat-donut-svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.donut-bg {
    fill: none;
    stroke: rgba(148, 163, 184, 0.2);
    stroke-width: 3.8;
}

.donut-stroke {
    fill: none;
    stroke-width: 3.8;
    stroke-linecap: round;
    transition: stroke-dasharray 0.6s ease;
}

.gold-stroke {
    stroke: #f59e0b;
    filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.5));
}

.blue-stroke {
    stroke: #3b82f6;
    filter: drop-shadow(0 0 4px rgba(59, 130, 246, 0.5));
}

.donut-center-text {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.72rem;
    font-weight: 800;
    color: var(--text-color);
    letter-spacing: -0.2px;
}

.stat-lux-meta-box {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    flex: 1;
}

.stat-lux-count {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-color);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
}

.stat-lux-count strong {
    font-size: 1.25rem;
    font-weight: 900;
    font-family: 'Lora', 'Merriweather', serif;
    letter-spacing: -0.2px;
}

.stat-lux-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.68rem;
    font-weight: 800;
    padding: 2px 7px;
    border-radius: 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.2;
    align-self: flex-start;
    max-width: 100%;
}

.gold-badge {
    color: #b45309;
    background: rgba(245, 158, 11, 0.15);
    border: 1px solid rgba(245, 158, 11, 0.35);
}

.blue-badge {
    color: #1d4ed8;
    background: rgba(59, 130, 246, 0.15);
    border: 1px solid rgba(59, 130, 246, 0.35);
}

:root[data-theme="dark"] .gold-badge,
:root[data-theme="ocean"] .gold-badge {
    color: #fbbf24;
}

:root[data-theme="dark"] .blue-badge,
:root[data-theme="ocean"] .blue-badge {
    color: #60a5fa;
}

/* 下方主體：全寬標題與描述 */
.stat-lux-body {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
    width: 100%;
}

.stat-lux-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.98rem;
    font-weight: 800;
    color: var(--text-color);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.35;
}

.stat-lux-card.gold-theme .stat-lux-title {
    color: #d97706;
}

.stat-lux-card.blue-theme .stat-lux-title {
    color: #2563eb;
}

:root[data-theme="dark"] .stat-lux-card.gold-theme .stat-lux-title {
    color: #fbbf24;
}

:root[data-theme="dark"] .stat-lux-card.blue-theme .stat-lux-title {
    color: #60a5fa;
}

.stat-lux-desc {
    font-size: 0.74rem;
    color: var(--text-muted);
    margin: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.3;
}

.hero-cta-group {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    align-items: center;
    margin-bottom: 2rem;
}

.btn-hero-glow {
    background: linear-gradient(135deg, #6366f1, #4f46e5);
    color: #ffffff !important;
    font-size: 1rem;
    font-weight: 800;
    padding: 0.75rem 1.6rem;
    border-radius: 14px;
    border: none;
    box-shadow: 0 6px 25px rgba(99, 102, 241, 0.55), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.22s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.btn-hero-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.75);
}

/* Mac Window App Showcase */
.mac-window-frame {
    background: var(--dropdown-bg, #ffffff);
    border: 1.5px solid var(--glass-border);
    border-radius: 20px;
    box-shadow: 
        0 25px 60px rgba(0, 0, 0, 0.35),
        0 0 35px rgba(99, 102, 241, 0.18),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    overflow: hidden;
    position: relative;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    transition: all 0.25s ease;
}

.mac-window-topbar {
    background: rgba(0, 0, 0, 0.12);
    border-bottom: 1px solid var(--glass-border);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.mac-window-dots {
    display: flex;
    gap: 6px;
    align-items: center;
}

.mac-dot {
    width: 11px;
    height: 11px;
    border-radius: 50%;
    display: inline-block;
}

.mac-dot.red { background: #ff5f56; }
.mac-dot.yellow { background: #ffbd2e; }
.mac-dot.green { background: #27c93f; }

.mac-window-title {
    font-size: 0.8rem;
    font-family: monospace;
    font-weight: 600;
    color: var(--text-muted);
    letter-spacing: 0.2px;
}

/* Floating Progress Badge */
.floating-progress-widget {
    position: absolute;
    top: 10px;
    right: 14px;
    background: var(--dropdown-bg, #ffffff);
    border: 1.2px solid var(--glass-border);
    border-radius: 20px;
    padding: 3px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--primary);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    display: inline-flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    z-index: 10;
}

.mac-window-body {
    padding: 1.4rem;
}