/* Premium CSS System for Bilingual Bible App */

/* Design Tokens & Theme Variables */
:root {
    --transition-speed: 0.3s;
    --font-sans: 'Inter', sans-serif;
    --font-serif: 'Nanum Myeongjo', serif;
    --font-title: 'Outfit', sans-serif;

    /* Elegant Muted Accent Colors (Sage, Slate, Taupe, Dusty Rose) */
    --accent-teal: #789078;     /* Sage Green: Calm & Warm */
    --accent-indigo: #788590;   /* Slate Blue: Intelligent & Soft */
    --accent-gold: #b3997e;     /* Taupe Sand: Classic & Warm */
    --accent-rose: #b0888b;     /* Dusty Rose: Deep & Elegant */
    
    /* Default Accent: Sage Green */
    --accent: var(--accent-teal);
    --accent-rgb: 120, 144, 120;
    
    /* Base font size multiplier managed by JS */
    --font-scale: 1.0;
}

/* Dark Theme (Warm Charcoal & Matte Feel) */
[data-theme="dark"] {
    --bg-gradient: none;
    --bg-color: #171615;
    --glass-bg: #201f1d;
    --glass-border: rgba(255, 255, 255, 0.04);
    --text-primary: #e6e3dd;
    --text-secondary: #999690;
    --text-muted: #6b6965;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.18);
    --header-bg: rgba(23, 22, 21, 0.95);
    --accent-dim: rgba(var(--accent-rgb), 0.08); /* Sophisticated light highlight */
    --accent-border: rgba(var(--accent-rgb), 0.25);
    --card-active-bg: rgba(var(--accent-rgb), 0.04);
    --panel-bg: #1e1d1b;
    --modal-bg-rgb: 30, 29, 27;
}

/* Light Theme (Ecru / Soft Ivory paper page feel) */
[data-theme="light"] {
    --bg-gradient: none;
    --bg-color: #f7f5f0;
    --glass-bg: #ffffff;
    --glass-border: rgba(42, 40, 37, 0.05);
    --text-primary: #2b2927;
    --text-secondary: #6c6964;
    --text-muted: #9f9b95;
    --card-shadow: 0 4px 20px rgba(42, 40, 37, 0.03);
    --header-bg: rgba(247, 245, 240, 0.95);
    --accent-dim: rgba(var(--accent-rgb), 0.06); /* Sophisticated light highlight */
    --accent-border: rgba(var(--accent-rgb), 0.25);
    --card-active-bg: rgba(var(--accent-rgb), 0.03);
    --panel-bg: #ffffff;
    --modal-bg-rgb: 255, 255, 255;
}

/* CSS Reset & Defaults */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-primary);
    overflow-x: hidden;
    min-height: 100vh;
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* Ambient Background Glimmer */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--bg-gradient);
    z-index: -2;
    transition: background var(--transition-speed);
}

.ambient-bg::before {
    content: '';
    position: absolute;
    top: -20%;
    left: -20%;
    width: 60%;
    height: 60%;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.04) 0%, rgba(0,0,0,0) 70%);
    filter: blur(80px);
    pointer-events: none;
    transition: background 0.5s ease;
    animation: pulseGlow 15s infinite alternate ease-in-out;
}

@keyframes pulseGlow {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.2) translate(10%, 10%); }
}

/* App Containers */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 1024px;
    margin: 0 auto;
    position: relative;
    padding-bottom: env(safe-area-inset-bottom);
}

/* Floating Premium Header */
.app-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--glass-border);
    transition: background var(--transition-speed), border-color var(--transition-speed);
}

.header-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px 8px 20px;
}

.brand {
    display: flex;
    flex-direction: column;
}

.brand-sub {
    font-family: var(--font-title);
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--text-muted);
    font-weight: 700;
}

/* Bible Picker Trigger Button (Brand Title) */
.picker-trigger-btn {
    border: none;
    background: transparent;
    padding: 2px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-title);
    font-size: 24px;
    font-weight: 800;
    color: var(--text-primary);
    cursor: pointer;
    text-align: left;
    transition: color 0.2s ease;
}

.picker-trigger-btn:hover {
    color: var(--accent);
}

.picker-trigger-btn #header-chapter-num {
    color: var(--accent);
    margin-left: 4px;
    transition: color var(--transition-speed);
}

.trigger-arrow {
    font-size: 14px;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}

.picker-trigger-btn:hover .trigger-arrow {
    color: var(--accent);
    transform: translateY(2px);
}

.header-actions {
    display: flex;
    gap: 8px;
}

/* Layout Options Bar */
.layout-selector-bar {
    padding: 4px 20px 14px 20px;
}

.segment-container {
    display: flex;
    gap: 10px;
    width: 100%;
}

.layout-toggle-container,
.lang-toggle-container {
    flex: 1;
    display: flex;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 4px;
    gap: 2px;
}

.layout-btn,
.lang-btn-quick {
    flex: 1;
    border: none;
    background: transparent;
    padding: 9px 8px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--text-secondary);
    font-size: 12.5px;
    font-weight: 600;
    transition: all 0.2s ease;
}

.layout-btn i,
.lang-btn-quick i {
    font-size: 13.5px;
}

.layout-btn.active,
.lang-btn-quick.active {
    background: var(--accent);
    color: #000;
}

/* Button & UI styling */
.icon-btn {
    border: none;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* Slide-out Settings Panel */
.settings-panel {
    position: fixed;
    top: 0;
    right: -320px;
    width: 300px;
    height: 100vh;
    background: var(--panel-bg);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    box-shadow: -10px 0 30px rgba(0,0,0,0.25);
    z-index: 1000;
    padding: 24px;
    display: flex;
    flex-direction: column;
    transition: right 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    border-left: 1px solid var(--glass-border);
}

.settings-panel.open {
    right: 0;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 12px;
}

.settings-header h3 {
    font-family: var(--font-title);
    font-size: 18px;
    font-weight: 700;
}

.close-btn {
    border: none;
    background: transparent;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
}

.settings-body {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.setting-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.setting-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.font-size-controls {
    display: flex;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 6px;
    justify-content: space-between;
}

.ctrl-btn {
    border: none;
    background: transparent;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.ctrl-btn:hover {
    background: rgba(255,255,255,0.08);
}

.size-val {
    font-weight: 700;
    font-size: 14px;
    font-family: var(--font-title);
}

.font-family-controls {
    display: flex;
    gap: 8px;
}

.family-btn {
    flex-grow: 1;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
}

.family-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

.sub-lang-controls {
    display: flex;
    gap: 8px;
    width: 100%;
}

.lang-btn {
    flex-grow: 1;
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    padding: 8.5px 12px;
    border-radius: 10px;
    cursor: pointer;
    font-size: 13px;
    font-weight: 600;
    transition: all 0.2s;
}

.lang-btn.active {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
}

.accent-color-pickers {
    display: flex;
    gap: 12px;
    padding: 4px 0;
}

.color-dot {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.2s, border-color 0.2s;
}

.color-dot:hover {
    transform: scale(1.1);
}

.color-dot.active {
    border-color: var(--text-primary);
    transform: scale(1.15);
}

.color-dot.teal { background-color: var(--accent-teal); }
.color-dot.indigo { background-color: var(--accent-indigo); }
.color-dot.gold { background-color: var(--accent-gold); }
.color-dot.rose { background-color: var(--accent-rose); }


/* Bible & Chapter Picker Modal (Bottom Sheet styling) */
.picker-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1500;
    display: none;
    align-items: flex-end;
    justify-content: center;
}

.picker-modal.open {
    display: flex;
}

.picker-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.picker-modal.open .picker-backdrop {
    opacity: 1;
}

.picker-sheet {
    background: var(--panel-bg);
    border-top-left-radius: 28px;
    border-top-right-radius: 28px;
    width: 100%;
    max-width: 600px;
    height: 75vh;
    max-height: 750px;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
    border: 1px solid var(--glass-border);
    border-bottom: none;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    overflow: hidden;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.35);
}

.picker-modal.open .picker-sheet {
    transform: translateY(0);
}

/* Bottom Sheet header & drag handle indicators */
.sheet-handle-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 12px 16px 8px 16px;
    position: relative;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(var(--modal-bg-rgb), 0.5);
    flex-shrink: 0;
}

.sheet-handle {
    width: 44px;
    height: 5px;
    background: var(--text-muted);
    border-radius: 10px;
    opacity: 0.5;
}

.sheet-close-btn {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    border: none;
    background: transparent;
    font-size: 20px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.2s;
}

.sheet-close-btn:hover {
    background: rgba(255, 255, 255, 0.08);
}

/* Switchable views inside Sheet */
.picker-view {
    display: none;
    flex-direction: column;
    flex-grow: 1;
    overflow: hidden;
    height: calc(100% - 45px); /* Subtract handle height */
}

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

.picker-grid-container {
    flex-grow: 1;
    overflow-y: auto;
    padding-bottom: 40px;
}

/* 1. Books View Tab selector bar */
.picker-tabs {
    display: flex;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(var(--modal-bg-rgb), 0.3);
    flex-shrink: 0;
}

.tab-btn {
    flex-grow: 1;
    border: none;
    background: transparent;
    padding: 16px 0;
    font-size: 16px;
    font-weight: 700;
    color: var(--text-secondary);
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s;
    text-align: center;
    border-bottom: 3px solid transparent;
}

.tab-btn.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

/* 4-Column Grid for Biblical Books (구약/신약) */
.books-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px 10px;
    padding: 20px 16px;
}

.book-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: transform 0.2s;
}

.book-card:active {
    transform: scale(0.95);
}

.book-abbr-box {
    width: 100%;
    aspect-ratio: 1.1;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: all 0.2s ease;
}

.book-name-label {
    margin-top: 6px;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-secondary);
    text-align: center;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Active Book design (Genesis) */
.book-card.active .book-abbr-box {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-dim);
    box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.2);
}

.book-card.active .book-name-label {
    color: var(--accent);
    font-weight: 700;
}

/* Dim non-implemented books */
.book-card.disabled {
    opacity: 0.45;
}

.book-card.disabled:active {
    transform: none;
}

.book-card.disabled .book-abbr-box {
    background: rgba(0,0,0,0.02);
    border-style: dashed;
}

/* 2. Chapters selection View design (5-Column) */
.picker-view-header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(var(--modal-bg-rgb), 0.3);
    flex-shrink: 0;
}

.back-btn {
    border: 1px solid var(--glass-border);
    background: var(--glass-bg);
    color: var(--text-primary);
    padding: 6px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s;
}

.back-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.selected-book-title {
    margin-left: 16px;
    font-size: 18px;
    font-weight: 800;
    font-family: var(--font-sans);
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    padding: 20px 16px;
}

.chapter-card {
    aspect-ratio: 1;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-title);
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    cursor: pointer;
    box-shadow: 0 4px 10px rgba(0,0,0,0.05);
    transition: all 0.2s ease;
}

.chapter-card:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.chapter-card.active {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
    box-shadow: 0 4px 15px rgba(var(--accent-rgb), 0.35);
}

.chapter-card:active {
    transform: scale(0.95);
}


/* Main Reading Container */
.reading-area {
    flex-grow: 1;
    padding: 20px;
    position: relative;
    overflow-y: auto;
    overflow-x: hidden;
}

.bible-content {
    transition: opacity 0.25s ease-in-out;
}

/* Loading & Error States */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 0;
    color: var(--text-secondary);
    gap: 16px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--glass-border);
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* General Font Family applications */
.font-sans .passage-body {
    font-family: var(--font-sans);
}
.font-serif .passage-body {
    font-family: var(--font-serif);
}

/* Premium Passage Panel (Paper page feel) */
.passage-panel {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 28px;
    margin-bottom: 24px;
    box-shadow: var(--card-shadow);
    transition: transform 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.passage-header {
    font-family: var(--font-title);
    font-size: 18px;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: 18px;
    border-bottom: 1px dashed var(--glass-border);
    padding-bottom: 10px;
    letter-spacing: 0.5px;
}

.passage-body {
    text-align: justify;
    word-break: keep-all;
    overflow-wrap: break-word;
}

/* SANS & SERIF Typography Tuning */
.font-sans .passage-body {
    font-size: calc(1.08rem * var(--font-scale));
    line-height: 1.9;
    color: var(--text-primary);
}

.font-serif .passage-body {
    font-size: calc(1.15rem * var(--font-scale));
    line-height: 2.0;
    color: var(--text-primary);
    font-weight: 500;
}

/* English Passage styles (lightweight text color and size) */
.english .passage-body {
    font-size: calc(0.98rem * var(--font-scale));
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Verse Units (Flowing inline segments) */
.verse-unit {
    display: inline;
    cursor: pointer;
    border-radius: 6px;
    padding: 2px 4px;
    transition: background-color 0.2s, color 0.2s;
}

.verse-unit:hover {
    background-color: rgba(var(--accent-rgb), 0.08);
}

.verse-unit.active-verse {
    background-color: var(--accent-dim);
    border-bottom: 2px solid var(--accent);
    color: var(--text-primary);
}

/* Verse Number (Superscript style) */
.verse-num {
    vertical-align: super;
    font-size: calc(0.72em * var(--font-scale));
    font-weight: 800;
    color: var(--accent);
    margin-right: 3px;
    margin-left: 2px;
    font-family: var(--font-title);
    transition: color 0.2s;
}

.verse-unit.active-verse .verse-num {
    color: var(--text-primary);
}

/* Layout 1: STACKED (Over-Under Passage) Style */
.layout-stacked {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Layout 2: SIDE-BY-SIDE (Parallel Passage) Style */
.layout-side {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* Mobile layout: side-by-side but tighter spacing */
    gap: 12px;
}

@media (max-width: 767px) {
    .layout-side .passage-panel {
        padding: 16px;
        border-radius: 16px;
    }
    
    .layout-side .passage-header {
        font-size: 15px;
        margin-bottom: 12px;
    }
    
    .layout-side .passage-body {
        font-size: calc(0.85rem * var(--font-scale));
        line-height: 1.6;
    }
}

/* Tablet & Desktop Layout Tuning for Parallel view */
@media (min-width: 768px) {
    .layout-side {
        gap: 28px;
    }
    
    .layout-side .passage-panel {
        padding: 32px;
        margin-bottom: 0;
    }
    
    .layout-selector-bar {
        padding-left: 0;
        padding-right: 0;
    }
    
    .reading-area {
        padding: 30px 0;
    }
}

/* Floating Action Navigation Buttons */
.floating-nav-buttons {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 40px;
    pointer-events: none;
    z-index: 90;
    width: 100%;
    max-width: 600px;
    justify-content: space-between;
    padding: 0 30px;
}

.nav-fab {
    pointer-events: auto;
    border: none;
    background: rgba(var(--accent-rgb), 0.85);
    color: #000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(var(--accent-rgb), 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: transform 0.2s, background-color 0.2s, box-shadow 0.2s;
}

.nav-fab:hover {
    transform: scale(1.1);
    background: rgba(var(--accent-rgb), 1);
    box-shadow: 0 10px 28px rgba(var(--accent-rgb), 0.6);
}

.nav-fab:active {
    transform: scale(0.95);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 3px;
}

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

/* Swipe Indicator Animations */
.swipe-indicator {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.8);
    color: #fff;
    padding: 12px 20px;
    border-radius: 30px;
    font-size: 14px;
    font-weight: 600;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 100;
}

.prev-indicator {
    left: -50px;
}

.next-indicator {
    right: -50px;
}

.swipe-active-prev .prev-indicator {
    opacity: 0.8;
    transform: translateY(-50%) translateX(70px);
}

.swipe-active-next .next-indicator {
    opacity: 0.8;
    transform: translateY(-50%) translateX(-70px);
}

/* Gesture Hint Popup styling */
.gesture-hint {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.gesture-hint.visible {
    opacity: 1;
    pointer-events: auto;
}

.gesture-hint-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--card-shadow);
    padding: 30px;
    border-radius: 24px;
    text-align: center;
    max-width: 80%;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.swipe-hand {
    font-size: 48px;
    color: var(--accent);
    animation: swipeDemo 2s infinite ease-in-out;
}

@keyframes swipeDemo {
    0% { transform: translateX(-30px) rotate(-10deg); }
    50% { transform: translateX(30px) rotate(10deg); }
    100% { transform: translateX(-30px) rotate(-10deg); }
}

.gesture-hint-content p {
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
}

.premium-btn {
    border: none;
    background: var(--accent);
    color: #000;
    padding: 10px 24px;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
    font-size: 14px;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.3);
}

.premium-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(var(--accent-rgb), 0.5);
}

.premium-btn:active {
    transform: translateY(0);
}

/* Toast Notification Styles */
.toast-container {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    gap: 8px;
    z-index: 3000;
    pointer-events: none;
    width: 90%;
    max-width: 320px;
}

.toast-message {
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    color: #fff;
    padding: 12px 18px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast-message.show {
    opacity: 1;
    transform: translateY(0);
}

/* Hebrew / Greek Typography and Direction Optimization */
.hebrew-mode .verse-unit {
    font-family: "SBL Hebrew", "Times New Roman", SBL-Hebrew, serif;
    font-size: 1.18em;
    line-height: 1.8;
    text-align: right;
    direction: rtl;
    display: inline-block;
    width: 100%;
    margin-bottom: 8px;
}

.hebrew-mode .verse-num {
    direction: ltr;
    display: inline-block;
    margin-left: 6px;
    font-size: 0.7em;
    color: var(--accent);
}

.greek-mode .verse-unit {
    font-family: "SBL Greek", "Times New Roman", Gentium, serif;
    font-size: 1.08em;
    line-height: 1.6;
}

/* Theological Commentary & Lexicon Reference Box Styles */
.reference-section {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 260px;
    background: var(--glass-bg);
    border-top: 1px solid var(--glass-border);
    backdrop-filter: blur(25px);
    -webkit-backdrop-filter: blur(25px);
    z-index: 1000;
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.15);
}

/* Collapsed state */
.reference-section.collapsed {
    transform: translateY(215px); /* Header height remains 45px visible */
}

.reference-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

.reference-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 45px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.header-title-area {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13.5px;
    font-weight: 700;
    color: var(--accent);
}

.ref-icon {
    font-size: 14px;
}

.ref-close-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 14px;
    cursor: pointer;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.3s;
}

.ref-close-btn:hover {
    background: rgba(255, 255, 255, 0.05);
}

.reference-section.collapsed .ref-close-btn {
    transform: rotate(180deg);
}

.reference-content {
    flex: 1;
    padding: 12px 0 16px 0;
    overflow-y: auto;
}

.empty-state-ref {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-muted);
    text-align: center;
    font-size: 12.5px;
    line-height: 1.6;
    gap: 8px;
}

.empty-state-ref .info-icon {
    font-size: 22px;
    color: rgba(var(--accent-rgb), 0.3);
}

/* Lexicon Card grid */
.lexicon-grid {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    padding-bottom: 8px;
    margin-bottom: 12px;
    -webkit-overflow-scrolling: touch;
}

/* Custom scrollbar for horizontal cards */
.lexicon-grid::-webkit-scrollbar {
    height: 4px;
}
.lexicon-grid::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.01);
}
.lexicon-grid::-webkit-scrollbar-thumb {
    background: rgba(var(--accent-rgb), 0.2);
    border-radius: 2px;
}

.lexicon-card {
    flex: 0 0 260px;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 10px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.lex-korean {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
}

.lex-original {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
}

.lex-meta {
    font-size: 9.5px;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.04);
    padding: 1px 6px;
    border-radius: 4px;
    align-self: flex-start;
}

.lex-meaning {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-top: 4px;
}

/* Commentary Section styling */
.theological-commentary {
    background: rgba(var(--accent-rgb), 0.04);
    border-left: 3px solid var(--accent);
    padding: 10px 12px;
    border-radius: 0 12px 12px 0;
}

.commentary-label {
    font-size: 10px;
    font-weight: 800;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.commentary-text {
    font-size: 12px;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Give reading area padding-bottom to prevent content cutoff */
.reading-area {
    padding-bottom: 280px;
}