/* ==========================================================================
   PDF Tooltip Reader Online — Pure Client-Side Web Application Styles
   6 Themes: Dark, OLED, Nord, Sepia, E-Ink, Light
   ========================================================================== */

:root,
body[data-theme="dark"] {
    --bg: #121212;
    --surface: #1e1e1e;
    --surface-hover: #292929;
    --card-bg: #222222;
    --card-border: #2e2e2e;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --primary: #a855f7;
    --primary-hover: #9333ea;
    --primary-glow: rgba(168, 85, 247, 0.2);
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --blue: #38bdf8;
    --danger: #ef4444;
    --success: #10b981;
    --selection-bg: #8b5cf6;
    --selection-fg: #ffffff;
    --mark-bg: rgba(245, 158, 11, 0.22);
    --mark-fg: #fbbf24;
    --mark-border: #f59e0b;
    --hover-phrase-bg: rgba(168, 85, 247, 0.16);
    --hover-phrase-border: #a855f7;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.6);
}

body[data-theme="oled"] {
    --bg: #000000;
    --surface: #0a0a0a;
    --surface-hover: #171717;
    --card-bg: #0d0d0d;
    --card-border: #1f1f1f;
    --text: #e4e4e7;
    --text-muted: #71717a;
    --primary: #a855f7;
    --primary-hover: #9333ea;
    --primary-glow: rgba(168, 85, 247, 0.25);
    --accent: #f59e0b;
    --accent-hover: #d97706;
    --blue: #38bdf8;
    --selection-bg: #7c3aed;
    --selection-fg: #ffffff;
    --mark-bg: #382303;
    --mark-fg: #fbbf24;
    --mark-border: #f59e0b;
    --hover-phrase-bg: #1e122b;
    --hover-phrase-border: #a855f7;
}

body[data-theme="nord"] {
    --bg: #242933;
    --surface: #2e3440;
    --surface-hover: #3b4252;
    --card-bg: #3b4252;
    --card-border: #4c566a;
    --text: #eceff4;
    --text-muted: #d8dee9;
    --primary: #88c0d0;
    --primary-hover: #81a1c1;
    --primary-glow: rgba(136, 192, 208, 0.22);
    --accent: #ebcb8b;
    --accent-hover: #d08770;
    --blue: #88c0d0;
    --selection-bg: #5e81ac;
    --selection-fg: #eceff4;
    --mark-bg: rgba(235, 203, 139, 0.22);
    --mark-fg: #ebcb8b;
    --mark-border: #ebcb8b;
    --hover-phrase-bg: rgba(136, 192, 208, 0.16);
    --hover-phrase-border: #88c0d0;
}

body[data-theme="sepia"] {
    --bg: #f4ebd9;
    --surface: #eae0cb;
    --surface-hover: #dfd2b8;
    --card-bg: #fbf4e6;
    --card-border: #ded1b8;
    --text: #382c1e;
    --text-muted: #7d6b53;
    --primary: #8b5cf6;
    --primary-hover: #7c3aed;
    --primary-glow: rgba(139, 92, 246, 0.18);
    --accent: #d97706;
    --accent-hover: #b45309;
    --blue: #0284c7;
    --selection-bg: #fcd34d;
    --selection-fg: #451a03;
    --mark-bg: #fed7aa;
    --mark-fg: #9a3412;
    --mark-border: #d97706;
    --hover-phrase-bg: #ede9fe;
    --hover-phrase-border: #8b5cf6;
}

body[data-theme="eink"] {
    --bg: #f5f5f5;
    --surface: #e8e8e8;
    --surface-hover: #dcdcdc;
    --card-bg: #ffffff;
    --card-border: #cccccc;
    --text: #111111;
    --text-muted: #555555;
    --primary: #222222;
    --primary-hover: #000000;
    --primary-glow: rgba(0, 0, 0, 0.12);
    --accent: #333333;
    --accent-hover: #111111;
    --blue: #222222;
    --selection-bg: #222222;
    --selection-fg: #ffffff;
    --mark-bg: #e2e2e2;
    --mark-fg: #000000;
    --mark-border: #111111;
    --hover-phrase-bg: #ebebeb;
    --hover-phrase-border: #222222;
}

body[data-theme="light"] {
    --bg: #f1f5f9;
    --surface: #e2e8f0;
    --surface-hover: #cbd5e1;
    --card-bg: #ffffff;
    --card-border: #cbd5e1;
    --text: #0f172a;
    --text-muted: #64748b;
    --primary: #9333ea;
    --primary-hover: #7e22ce;
    --primary-glow: rgba(147, 51, 234, 0.15);
    --accent: #d97706;
    --accent-hover: #b45309;
    --blue: #0284c7;
    --selection-bg: #7c3aed;
    --selection-fg: #ffffff;
    --mark-bg: #fef3c7;
    --mark-fg: #b45309;
    --mark-border: #d97706;
    --hover-phrase-bg: #f3e8ff;
    --hover-phrase-border: #9333ea;
}

/* Typography & Spacing Custom Properties */
:root {
    --reader-font: Georgia, serif;
    --reader-font-size: 18px;
    --reader-line-height: 1.85;
    --reader-para-spacing: 1.3em;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

::selection {
    background: var(--selection-bg);
    color: var(--selection-fg);
}

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    transition: background-color 0.25s ease, color 0.25s ease;
}

/* Reading Progress Bar at Top */
#readingProgressBar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    width: 0%;
    background: linear-gradient(90deg, var(--primary), var(--blue));
    z-index: 9999;
    transition: width 0.2s ease;
}

/* ==========================================================================
   Header Toolbar (Single-Line Compact Icon Bar + Floating Hover Pills)
   ========================================================================== */
.app-header {
    background-color: var(--surface);
    border-bottom: 1px solid var(--card-border);
    padding: 6px 12px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    flex-wrap: nowrap;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

body.zen-mode .app-header,
body.zen-mode .book-tabs-bar,
body.zen-mode .in-book-search-bar {
    display: none !important;
}

.header-left,
.header-right {
    display: flex;
    align-items: center;
    gap: 5px;
    flex-wrap: nowrap;
    flex-shrink: 0;
}

.header-center {
    flex: 1;
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 8px;
    overflow: hidden;
}

.header-book-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
    display: block;
}

/* Floating Hover Label Pill (Option A: Zero Layout Shift) */
[data-label] {
    position: relative;
}

[data-label]::after {
    content: attr(data-label);
    position: absolute;
    top: calc(100% + 7px);
    left: 50%;
    transform: translateX(-50%) translateY(-4px);
    background: #18181b;
    color: #f4f4f5;
    border: 1px solid #3f3f46;
    padding: 4px 9px;
    border-radius: 6px;
    font-size: 0.74rem;
    font-weight: 600;
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.5);
    transition: opacity 0.14s ease, transform 0.14s ease, visibility 0.14s;
    z-index: 3000;
}

/* Prevent right-edge clipping on last buttons */
.header-right > :last-child [data-label]::after,
.header-right > [data-label]:last-child::after {
    left: auto;
    right: 0;
    transform: translateY(-4px);
}

.header-right > :last-child [data-label]:hover::after,
.header-right > [data-label]:last-child:hover::after {
    transform: translateY(0);
}

.header-left > [data-label]:first-child::after {
    left: 0;
    transform: translateY(-4px);
}

.header-left > [data-label]:first-child:hover::after {
    transform: translateY(0);
}

[data-label]:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* View Mode Switcher (Info-Wiki / Sticky-Space style) */
.view-mode-switcher {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 8px;
    padding: 2px;
    gap: 2px;
}

.view-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 5px 8px;
    border-radius: 6px;
    font-size: 0.88rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.18s ease;
}

.view-btn:hover {
    color: var(--text);
    background: var(--surface-hover);
}

.view-btn.active {
    background: var(--primary);
    color: #ffffff;
}

.badge-count {
    background: rgba(0, 0, 0, 0.28);
    color: inherit;
    padding: 1px 5px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
}

.trash-badge {
    background: var(--danger);
    color: #fff;
    padding: 1px 5px;
    border-radius: 999px;
    font-size: 0.7rem;
    font-weight: 700;
}

/* Buttons */
.btn {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text);
    padding: 6px 10px;
    border-radius: 7px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    transition: all 0.18s ease;
    user-select: none;
    white-space: nowrap;
    text-decoration: none;
}

.btn:hover {
    background: var(--surface-hover);
    border-color: var(--primary);
}

.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

.btn-primary:hover {
    background: var(--primary-hover);
}

.btn-accent {
    background: var(--accent);
    border-color: var(--accent);
    color: #000000;
}

.btn-accent:hover {
    background: var(--accent-hover);
    color: #ffffff;
}

.btn-danger {
    color: var(--danger);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.15);
    border-color: var(--danger);
}

.btn-icon-only {
    padding: 5px 8px;
    min-width: 32px;
    height: 32px;
}

/* Page Navigation Controls */
.page-nav-group {
    display: flex;
    align-items: center;
    gap: 3px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 2px 5px;
    border-radius: 8px;
}

.page-input {
    width: 42px;
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--card-border);
    color: var(--text);
    border-radius: 5px;
    padding: 2px 3px;
    font-size: 0.82rem;
    font-weight: 600;
}

.page-total-lbl {
    font-size: 0.78rem;
    color: var(--text-muted);
    padding: 0 3px;
    white-space: nowrap;
}

/* Compact Storage Indicator */
.storage-indicator {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 2px;
    min-width: 58px;
    height: 32px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 3px 7px;
    border-radius: 7px;
}

.storage-text {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 600;
}

.storage-bar-container {
    width: 100%;
    height: 4px;
    background: var(--surface);
    border-radius: 2px;
    overflow: hidden;
}

.storage-bar {
    height: 100%;
    background: var(--primary);
    transition: width 0.3s ease;
}

.storage-bar.warning {
    background: var(--accent);
}

.storage-bar.critical {
    background: var(--danger);
}

/* Tools Dropdown (from Info-Wiki / Sticky-Space) */
.tools-dropdown {
    position: relative;
}

.tools-content {
    display: none;
    position: absolute;
    right: 0;
    top: calc(100% + 6px);
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    min-width: 190px;
    padding: 6px;
    z-index: 2000;
    flex-direction: column;
    gap: 4px;
}

.tools-content.active {
    display: flex;
}

.tools-item {
    width: 100%;
    justify-content: flex-start;
    border: none;
    background: transparent;
    padding: 8px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
}

.tools-item:hover {
    background: var(--surface-hover);
}

/* ==========================================================================
   Book Collection / Tabs Bar (Like Spaces in Info-Wiki)
   ========================================================================== */
.book-tabs-bar {
    background: var(--surface);
    border-bottom: 1px solid var(--card-border);
    padding: 6px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    overflow-x: auto;
}

.tabs-container {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
}

.book-tab {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text-muted);
    padding: 5px 12px;
    border-radius: 7px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    white-space: nowrap;
    transition: all 0.18s ease;
}

.book-tab:hover {
    color: var(--text);
    border-color: var(--primary);
}

.book-tab.active {
    background: var(--primary-glow);
    border-color: var(--primary);
    color: var(--text);
}

.book-tab .tab-progress {
    font-size: 0.72rem;
    color: var(--blue);
    background: rgba(56, 189, 248, 0.12);
    padding: 1px 5px;
    border-radius: 4px;
}

/* ==========================================================================
   In-Book Search Bar (Ctrl+F)
   ========================================================================== */
.in-book-search-bar {
    display: none;
    background: var(--surface);
    border-bottom: 1px solid var(--card-border);
    padding: 8px 20px;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
}

.in-book-search-bar.active {
    display: flex;
}

.in-book-search-bar input {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text);
    padding: 6px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    min-width: 240px;
    outline: none;
}

.in-book-search-bar input:focus {
    border-color: var(--primary);
}

/* ==========================================================================
   Main Layout & View Sections
   ========================================================================== */
.view-section {
    display: none;
    flex: 1;
    width: 100%;
}

.view-section.active {
    display: flex;
}

/* Reader Layout (Left Main Reader + Right Collapsible Vocab Sidebar) */
.reader-workspace {
    display: flex;
    flex: 1;
    width: 100%;
    position: relative;
}

.reader-main-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 20px 80px;
}

/* Dropzone / Empty Book State */
.dropzone-banner {
    width: 100%;
    max-width: 860px;
    background: var(--card-bg);
    border: 2px dashed var(--card-border);
    border-radius: 14px;
    padding: 28px 24px;
    text-align: center;
    margin-bottom: 20px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dropzone-banner:hover,
.dropzone-banner.dragover {
    border-color: var(--primary);
    background: var(--primary-glow);
}

.dropzone-banner h3 {
    font-size: 1.15rem;
    margin-bottom: 6px;
    color: var(--text);
}

.dropzone-banner p {
    font-size: 0.88rem;
    color: var(--text-muted);
}

/* Book Page Card */
.reader-page-card {
    width: 100%;
    max-width: 860px;
    min-height: 68vh;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    box-shadow: var(--shadow-md);
    padding: 44px 52px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    transition: background-color 0.25s ease, border-color 0.25s ease;
}

.reader-page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.82rem;
    color: var(--text-muted);
}

.reader-page-body {
    font-family: var(--reader-font);
    font-size: var(--reader-font-size);
    line-height: var(--reader-line-height);
    color: var(--text);
    text-align: justify;
    text-justify: inter-word;
    -webkit-hyphens: auto;
    hyphens: auto;
    flex: 1;
}

.reader-page-body p {
    margin-bottom: var(--reader-para-spacing);
    text-indent: 0;
}

/* Tokenized Sentences (.phrase) */
.phrase {
    border-radius: 4px;
    padding: 1px 2px;
    transition: background-color 0.12s ease, box-shadow 0.12s ease;
    display: inline;
}

body.hover-active .phrase:hover,
.phrase.hovered-phrase {
    background-color: var(--hover-phrase-bg);
    box-shadow: 0 2px 0 0 var(--hover-phrase-border);
    cursor: pointer;
}

/* Marked Vocabulary Highlights inside Page */
mark.vocab-highlight {
    background-color: var(--mark-bg);
    color: var(--mark-fg);
    border-bottom: 2px solid var(--mark-border);
    padding: 0 3px;
    border-radius: 3px;
    font-weight: 600;
    cursor: pointer;
    transition: filter 0.15s ease;
}

mark.vocab-highlight:hover {
    filter: brightness(1.2);
}

/* ==========================================================================
   Reading Position Bookmark / Reading Marker
   ========================================================================== */
mark.reading-marker {
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.35), rgba(6, 182, 212, 0.45));
    color: #6ee7b7;
    border: 2px solid #10b981;
    border-radius: 6px;
    padding: 1px 6px 2px 6px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 0 14px rgba(16, 185, 129, 0.45), inset 0 0 6px rgba(6, 182, 212, 0.25);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    vertical-align: baseline;
    transition: all 0.2s ease;
}

mark.reading-marker:hover {
    filter: brightness(1.25);
    box-shadow: 0 0 18px rgba(16, 185, 129, 0.7);
}

.marker-pin-icon {
    font-size: 0.85em;
    display: inline-block;
    animation: markerBob 2s infinite ease-in-out;
}

@keyframes markerBob {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

@keyframes markerPulseAnim {
    0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.9); }
    50% { transform: scale(1.08); box-shadow: 0 0 22px 8px rgba(16, 185, 129, 0.7); }
    100% { transform: scale(1); box-shadow: 0 0 14px rgba(16, 185, 129, 0.45); }
}

mark.reading-marker.marker-pulse {
    animation: markerPulseAnim 1.2s ease-out 2;
}

/* Theme Adaptations for Reading Marker */
body[data-theme="light"] mark.reading-marker {
    background: #d1fae5;
    color: #065f46;
    border-color: #059669;
    box-shadow: 0 2px 10px rgba(5, 150, 105, 0.3);
}

body[data-theme="sepia"] mark.reading-marker {
    background: #ccfbf1;
    color: #115e59;
    border-color: #0d9488;
    box-shadow: 0 2px 10px rgba(13, 148, 136, 0.3);
}

body[data-theme="nord"] mark.reading-marker {
    background: rgba(143, 188, 187, 0.35);
    color: #88c0d0;
    border-color: #88c0d0;
    box-shadow: 0 0 12px rgba(136, 192, 208, 0.5);
}

body[data-theme="eink"] mark.reading-marker {
    background: #000000;
    color: #ffffff;
    border: 2px dashed #000000;
    box-shadow: none;
}

/* Header & Footer Marker Jump Buttons */
#jumpMarkerBtn.has-marker {
    color: #10b981;
    border-color: #10b981;
    background: rgba(16, 185, 129, 0.15);
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.35);
}

#footerJumpMarkerBtn {
    font-size: 0.8rem;
    padding: 4px 10px;
    border: 1px solid var(--card-border);
    background: var(--surface);
    color: var(--text-muted);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

#footerJumpMarkerBtn.active {
    background: rgba(16, 185, 129, 0.18);
    border-color: #10b981;
    color: #34d399;
    font-weight: 700;
    box-shadow: 0 0 8px rgba(16, 185, 129, 0.25);
}

#footerJumpMarkerBtn:hover {
    border-color: #10b981;
    color: var(--text);
}

/* Search Match Highlights inside Page */
mark.search-highlight {
    background-color: rgba(56, 189, 248, 0.35);
    color: var(--text);
    border-bottom: 2px solid var(--blue);
    padding: 0 2px;
    border-radius: 3px;
}

mark.search-highlight.active-match {
    background-color: var(--accent);
    color: #000;
    font-weight: 700;
}

.reader-page-footer {
    margin-top: 32px;
    padding-top: 16px;
    border-top: 1px dashed var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-page-jump {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-page-jump input {
    width: 48px;
    text-align: center;
    background: var(--surface);
    border: 1px solid var(--card-border);
    color: var(--text);
    border-radius: 6px;
    padding: 4px 6px;
    font-size: 0.85rem;
    font-weight: 600;
}
.footer-page-jump input:focus {
    border-color: var(--primary);
    outline: none;
}

/* ==========================================================================
   Right Vocabulary Sidebar (Collapsible)
   ========================================================================== */
.vocab-sidebar {
    width: 360px;
    background: var(--surface);
    border-left: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    height: calc(100vh - 95px);
    position: sticky;
    top: 95px;
    transition: margin-right 0.25s ease;
}

.vocab-sidebar.collapsed {
    display: none;
}

.sidebar-header {
    padding: 14px 16px;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-header h3 {
    font-size: 0.98rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.sidebar-controls {
    padding: 12px 16px;
    border-bottom: 1px solid var(--card-border);
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.sidebar-search {
    width: 100%;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    color: var(--text);
    padding: 7px 11px;
    border-radius: 7px;
    font-size: 0.85rem;
    outline: none;
}

.sidebar-search:focus {
    border-color: var(--primary);
}

.sidebar-action-row {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.vocab-cards-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.vocab-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: border-color 0.18s ease, transform 0.18s ease;
}

.vocab-card:hover {
    border-color: var(--primary);
    transform: translateY(-1px);
}

.vocab-card-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 8px;
}

.vocab-word {
    font-weight: 700;
    font-size: 0.98rem;
    color: var(--text);
    word-break: break-word;
}

.vocab-translation {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--blue);
}

.vocab-context {
    font-family: Georgia, serif;
    font-style: italic;
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--surface);
    padding: 6px 8px;
    border-radius: 6px;
    border-left: 3px solid var(--primary);
}

.vocab-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}

.vocab-jump-link {
    color: var(--primary);
    cursor: pointer;
    text-decoration: underline;
    font-weight: 600;
}

/* ==========================================================================
   List View & Trash View (Sticky-Space & Info-Wiki Pattern)
   ========================================================================== */
.table-view-container,
.trash-view-container {
    width: 100%;
    max-width: 1180px;
    margin: 0 auto;
    padding: 28px 20px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.view-header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    background: var(--surface);
    border: 1px solid var(--card-border);
    padding: 16px 20px;
    border-radius: 12px;
}

.vocab-table-wrapper {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    overflow-x: auto;
    box-shadow: var(--shadow-sm);
}

.vocab-table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

.vocab-table th,
.vocab-table td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--card-border);
    font-size: 0.9rem;
}

.vocab-table th {
    background: var(--surface);
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 0.76rem;
    letter-spacing: 0.5px;
}

.vocab-table tr:hover td {
    background: var(--surface-hover);
}

.trash-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 14px;
}

/* ==========================================================================
   Floating Mouse Tooltip Translator
   ========================================================================== */
#floatingTooltip {
    position: fixed;
    z-index: 4500;
    background: #18181b;
    color: #f4f4f5;
    border: 1px solid #3f3f46;
    border-radius: 12px;
    padding: 12px 14px;
    max-width: 380px;
    min-width: 240px;
    box-shadow: 0 14px 34px rgba(0, 0, 0, 0.65);
    display: none;
    flex-direction: column;
    gap: 8px;
    backdrop-filter: blur(12px);
    animation: tooltipPop 0.14s ease-out;
}

/* Hide floating tooltip whenever any modal is active */
body:has(.modal-overlay.active) #floatingTooltip {
    display: none !important;
}

@keyframes tooltipPop {
    from {
        opacity: 0;
        transform: translateY(5px) scale(0.98);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.tooltip-top-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    border-bottom: 1px solid #27272a;
    padding-bottom: 6px;
}

.tooltip-badges {
    display: flex;
    align-items: center;
    gap: 6px;
}

.lang-pill {
    background: #3b1d60;
    color: #d8b4fe;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 4px;
}

.mode-pill {
    color: #a1a1aa;
    font-size: 0.72rem;
}

.tooltip-btn-group {
    display: flex;
    align-items: center;
    gap: 5px;
}

.tt-btn {
    background: #27272a;
    border: 1px solid #3f3f46;
    color: #f4f4f5;
    padding: 3px 8px;
    border-radius: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tt-btn:hover {
    background: #3f3f46;
}

.tt-btn.save-btn {
    background: #a855f7;
    border-color: #a855f7;
    color: #fff;
}

.tt-btn.save-btn.saved {
    background: #f59e0b;
    border-color: #f59e0b;
    color: #000;
}

.tt-btn.marker-btn {
    border-color: #10b981;
    color: #34d399;
}

.tt-btn.marker-btn:hover {
    background: rgba(16, 185, 129, 0.25);
    color: #a7f3d0;
}

.tt-btn.marker-btn.active {
    background: #10b981;
    border-color: #10b981;
    color: #ffffff;
    box-shadow: 0 0 10px rgba(16, 185, 129, 0.5);
}

.tooltip-orig-text {
    font-family: Georgia, serif;
    font-style: italic;
    font-size: 0.86rem;
    color: #a1a1aa;
    line-height: 1.35;
    max-height: 75px;
    overflow-y: auto;
}

.tooltip-trans-text {
    font-size: 1.02rem;
    font-weight: 700;
    color: #38bdf8;
    line-height: 1.4;
}

.tooltip-ctx-text {
    font-family: Georgia, serif;
    font-size: 0.76rem;
    color: #71717a;
    border-top: 1px dashed #27272a;
    padding-top: 5px;
}

/* ==========================================================================
   Modals (Flashcards, Library Shelf, Settings, Export/Import)
   ========================================================================== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.72);
    backdrop-filter: blur(4px);
    z-index: 9500;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal-overlay.active {
    display: flex;
}

.modal-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 14px;
    width: 100%;
    max-width: 580px;
    max-height: 88vh;
    overflow-y: auto;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
}

.modal-header {
    padding: 16px 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--card-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.modal-body {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-footer {
    padding: 14px 20px;
    background: var(--surface);
    border-top: 1px solid var(--card-border);
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

/* Flashcard Study Box */
.flashcard-stage {
    background: var(--surface);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 32px 24px;
    min-height: 250px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 14px;
    cursor: pointer;
}

.flashcard-front {
    font-family: Georgia, serif;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text);
}

.flashcard-context {
    font-family: Georgia, serif;
    font-style: italic;
    font-size: 0.95rem;
    color: var(--text-muted);
    max-width: 460px;
}

.flashcard-divider {
    width: 80%;
    height: 1px;
    background: var(--card-border);
    margin: 4px 0;
}

.flashcard-back {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--blue);
}

/* Settings Grid */
.settings-group {
    background: var(--surface);
    border: 1px solid var(--card-border);
    border-radius: 10px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.settings-group h4 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--primary);
}

.theme-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.theme-option-btn {
    padding: 10px;
    border-radius: 8px;
    border: 2px solid var(--card-border);
    background: var(--card-bg);
    color: var(--text);
    font-weight: 600;
    font-size: 0.82rem;
    cursor: pointer;
    text-align: center;
    transition: all 0.15s ease;
}

.theme-option-btn.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

/* Undo & Notification Toast (Sticky-Space style) */
.toast-notification {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: #18181b;
    color: #fff;
    border: 1px solid #3f3f46;
    padding: 10px 18px;
    border-radius: 999px;
    box-shadow: var(--shadow-lg);
    display: none;
    align-items: center;
    gap: 12px;
    z-index: 9500;
    font-size: 0.88rem;
    font-weight: 600;
}

.toast-notification.show {
    display: flex;
}

.toast-undo-btn {
    background: var(--primary);
    color: #fff;
    border: none;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 700;
    cursor: pointer;
}

/* Exit Zen Floating Pill */
#exitZenBtn {
    display: none;
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 9000;
    opacity: 0.35;
    transition: opacity 0.2s ease;
}

#exitZenBtn:hover {
    opacity: 1;
}

body.zen-mode #exitZenBtn {
    display: inline-flex;
}

/* Responsive */
@media (hover: none) {
    /* Prevent tooltip pills sticking on mobile touchscreen taps */
    [data-label]::after {
        display: none !important;
    }
}

@media (max-width: 900px) {
    .app-header {
        overflow-x: auto;
        scrollbar-width: none;
    }
    .app-header::-webkit-scrollbar {
        display: none;
    }
    .storage-indicator {
        display: none;
    }
    .reader-page-card {
        padding: 24px 20px;
    }
    .vocab-sidebar {
        position: fixed;
        right: 0;
        top: 0;
        height: 100vh;
        z-index: 4000;
        box-shadow: var(--shadow-lg);
    }
}

@media (max-width: 640px) {
    .app-header {
        padding: 6px 8px;
        gap: 6px;
        justify-content: space-between;
    }
    .header-left,
    .header-right {
        gap: 5px;
    }
    .btn-icon-only {
        width: 34px;
        height: 34px;
        min-width: 34px;
        padding: 0;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 1rem;
        border-radius: 8px;
    }
    .view-btn {
        min-width: 34px;
        height: 30px;
        padding: 0 4px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
        font-size: 0.95rem;
    }
    .view-btn .badge-count,
    .view-btn .trash-badge {
        display: none !important;
    }
    #toggleSidebarBtn {
        position: relative;
    }
    #toggleSidebarBtn .badge-count {
        position: absolute;
        top: -3px;
        right: -3px;
        font-size: 0.6rem;
        padding: 1px 4px;
        line-height: 1;
        border-radius: 999px;
        background: var(--accent);
        color: #000;
        font-weight: 800;
    }
    /* Hide non-essential buttons on phones to keep a single clean bar */
    #fontMinusBtn,
    #fontPlusBtn,
    #zenModeBtn {
        display: none;
    }
    .reader-main-column {
        padding: 10px 8px calc(85px + env(safe-area-inset-bottom, 0px));
    }
    .reader-page-card {
        padding: 18px 14px 20px;
        border-radius: 10px;
        min-height: auto;
    }
    .header-center {
        padding: 0 4px;
    }
    .header-book-title {
        font-size: 0.76rem;
    }
    .reader-page-body {
        font-size: 16px;
        text-align: left;
        -webkit-user-select: text;
        user-select: text;
        -webkit-tap-highlight-color: rgba(187, 134, 252, 0.25);
    }
    .phrase {
        -webkit-user-select: text;
        user-select: text;
    }
    .reader-page-footer {
        padding-top: 14px;
        margin-top: 20px;
    }
    #floatingTooltip {
        max-width: calc(100vw - 20px);
        min-width: 200px;
    }
    .vocab-sidebar {
        width: 100vw;
        max-width: 360px;
    }
}