:root {
    /* Light Theme - Clean Ivory & Slate */
    --bg-color: #faf9f6;
    --bg-gradient: radial-gradient(circle at top right, #ffffff 0%, #faf9f6 60%, #f4f2ec 100%);
    --text-primary: #2c2c2c;
    --text-secondary: #7a7571;
    --glass-bg: rgba(255, 255, 255, 0.6);
    --glass-border: rgba(0, 0, 0, 0.05);
    --glass-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.05);
    --accent-color: #8c734a;
    /* Darker accent */
    --accent-hover: #5c4727;
    --primary-color: #4a3821;
    /* Stronger primary contrast */
    --card-bg: rgba(255, 255, 255, 0.7);
    --card-border: rgba(0, 0, 0, 0.03);
    --player-bg: rgba(255, 255, 255, 0.8);
}

[data-theme="dark"] {
    /* Dark Theme - Deep Charcoal & Soft Gold */
    --bg-color: #111111;
    --bg-gradient: radial-gradient(circle at top left, #1f1d1b 0%, #111111 60%, #0a0a0a 100%);
    --text-primary: #f0ebe1;
    --text-secondary: #a39e98;
    --glass-bg: rgba(25, 25, 25, 0.4);
    --glass-border: rgba(255, 255, 255, 0.03);
    --glass-shadow: 0 16px 48px -12px rgba(0, 0, 0, 0.5);
    --accent-color: #d4b886;
    --accent-hover: #e2cca6;
    --primary-color: #c9a76d;
    --card-bg: rgba(20, 20, 20, 0.5);
    --card-border: rgba(255, 255, 255, 0.05);
    --player-bg: rgba(30, 30, 30, 0.7);
}

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

body {
    font-family: 'Yatra One', system-ui, sans-serif;
    background: var(--bg-gradient);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background 0.6s ease, color 0.6s ease;
    overflow: hidden;
}

body::before {
    display: none;
}

[data-theme="dark"] body::before {
    display: none;
}

h1,
h2,
h3,
h4,
h5,
h6,
.brand-font {
    font-family: 'Yatra One', system-ui, sans-serif;
    font-weight: 600;
    letter-spacing: 0.5px;
}

/* Full-Width Navigation Bar */
.app-navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 40px;
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-radius: 0;
}

.nav-brand {
    cursor: pointer;
    transition: transform 0.2s;
}

.nav-brand:hover {
    transform: scale(1.05);
}

.nav-brand h2 {
    font-size: 1.8rem;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 0;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Main App Container */
.app-container {
    width: 100vw;
    height: 100vh;
    padding-top: 100px;
    /* Space for fixed navbar */
    display: flex;
    justify-content: center;
    box-sizing: border-box;
    overflow: hidden;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    /* Softer radius */
    box-shadow: var(--glass-shadow);
    transition: all 0.4s ease;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    width: 100%;
    max-width: 1600px;
    margin: 0 auto;
}

.app-header {
    padding: 30px 48px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
    z-index: 10;
}

#mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.header-title h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.controls {
    display: flex;
    align-items: center;
    gap: 16px;
}

.btn-toggle {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 6px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s;
}

.btn-toggle:hover {
    border-color: var(--text-primary);
}

.btn-toggle span.active {
    color: var(--accent-color);
}

.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s;
}

.icon-btn:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    transform: rotate(15deg);
}

/* Content Area Layouts */
.content-scroll {
    flex: 1;
    overflow-y: auto;
    padding: 20px 48px 60px 48px;
    scroll-behavior: smooth;
    width: 100%;
}

.content-scroll::-webkit-scrollbar {
    width: 8px;
}

.content-scroll::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 4px;
}

/* Home View Layout */
.home-hero {
    text-align: center;
    padding: 120px 20px 80px 20px;
    animation: fadeInDown 1.2s cubic-bezier(0.2, 0.8, 0.2, 1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.home-hero h1 {
    font-size: 6rem;
    color: var(--primary-color);
    margin-bottom: 24px;
    font-weight: 700;
    opacity: 0.9;
}

.home-hero h2 {
    font-size: 3.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: var(--text-primary);
    letter-spacing: 2px;
}

.home-hero p {
    color: var(--text-secondary);
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.8;
    font-weight: 400;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.5px;
}

/* Chapter Grid */
.chapter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
    padding-bottom: 80px;
    max-width: 1200px;
    margin: 0 auto;
}

.chapter-grid-card {
    padding: 48px 32px;
    cursor: pointer;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border-radius: 16px;
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--card-border);
    position: relative;
    overflow: hidden;
}

.chapter-grid-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    border-color: var(--glass-border);
}

.chapter-grid-card .chap-num {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent-color);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 3px;
    font-family: 'Inter', sans-serif;
}

.chapter-grid-card .chap-name {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.chapter-grid-card .chap-summary {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Typographic Elements */
.sanskrit-text {
    font-size: 2.5rem;
    text-align: center;
    color: var(--primary-color);
    line-height: 1.8;
    margin: 20px 0 10px 0;
    font-weight: 700;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.transliteration {
    font-size: 1.4rem;
    text-align: center;
    color: var(--text-secondary);
    font-style: italic;
    line-height: 2;
    margin-bottom: 24px;
    font-family: 'Yatra One', system-ui, sans-serif;
}

.verse-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
    padding-bottom: 80px;
}

.verse-detail-container::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background-image: url('../data/img/om-watermark.svg');
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
    opacity: 0.03;
    pointer-events: none;
    z-index: -1;
}

.divine-divider {
    width: 60%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    border: none;
    margin: 40px auto;
    opacity: 0.5;
}

.word-meanings-container {
    margin-bottom: 40px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 40px;
    width: 100%;
}

.word-meanings-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 24px;
}

.word-chip {
    display: flex;
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    padding: 10px 12px;
    text-align: left;
    background: transparent;
    border-bottom: 1px solid var(--card-border);
    transition: background 0.3s;
    gap: 8px;
}

.word-chip:hover {
    background: var(--glass-border);
}

.chip-sanskrit {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 0;
    font-family: 'Yatra One', system-ui, sans-serif;
    white-space: nowrap;
}

.chip-meaning {
    font-size: 1rem;
    color: var(--text-primary);
    line-height: 1.5;
}

.translation-block,
.commentary-block {
    margin-bottom: 40px;
    background: var(--card-bg);
    padding: 48px;
    border-radius: 20px;
    border: 1px solid var(--card-border);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.translation-block::before,
.commentary-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    opacity: 0.3;
}

.author-name {
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent-color);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: 'Inter', sans-serif;
}

.desc-text {
    font-size: 1.15rem;
    line-height: 1.9;
    color: var(--text-primary);
    font-family: 'Yatra One', system-ui, sans-serif;
}

/* Custom Audio Player */
.audio-player-container {
    display: flex;
    justify-content: center;
    margin-bottom: 56px;
    width: 100%;
}

.custom-audio-player {
    display: flex;
    align-items: center;
    gap: 16px;
    background: var(--player-bg);
    border: 1px solid var(--glass-border);
    padding: 16px 24px;
    border-radius: 40px;
    box-shadow: var(--glass-shadow);
    width: 100%;
    max-width: 500px;
    backdrop-filter: blur(20px);
}

.play-pause-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--primary-color);
    color: #fff;
    border: none;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(255, 152, 0, 0.3);
    transition: transform 0.2s, box-shadow 0.2s;
    flex-shrink: 0;
}

.play-pause-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 16px rgba(255, 152, 0, 0.4);
}

.audio-timeline {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 12px;
}

.time-display {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
    font-family: 'Inter', monospace;
    min-width: 40px;
    text-align: center;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--card-border);
    border-radius: 3px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.progress-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: var(--accent-color);
    width: 0%;
    border-radius: 3px;
    transition: width 0.1s linear;
}

/* Loaders and States */
.loader-container {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--text-secondary);
}

.loader-container.active {
    display: flex;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--glass-border);
    border-top-color: var(--accent-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 16px;
}

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

.section-hide {
    display: none;
    opacity: 0;
    animation: fadeIn 0.4s forwards;
}

.section-show {
    display: block;
    opacity: 1;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.verses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 32px;
    margin-top: 40px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .app-navbar {
        padding: 12px 20px;
    }

    .app-container {
        padding-top: 80px;
    }

    .content-scroll {
        padding: 16px 16px 60px 16px;
    }

    .home-hero h1 {
        font-size: 4rem;
    }

    .home-hero h2 {
        font-size: 2rem;
        letter-spacing: 1px;
    }

    .chapter-grid {
        grid-template-columns: 1fr;
    }

    .verses-grid {
        grid-template-columns: 1fr;
    }

    .word-meanings-grid {
        grid-template-columns: 1fr;
    }

    .sanskrit-text {
        font-size: 2.2rem;
        line-height: 1.6;
        margin: 30px 0 16px 0;
    }

    .transliteration {
        font-size: 1.1rem;
        margin-bottom: 30px;
    }

    .custom-audio-player {
        flex-direction: column;
        padding: 16px;
        border-radius: 20px;
        max-width: 100%;
    }

    .audio-timeline {
        width: 100%;
        margin-top: 8px;
    }

    .translation-block,
    .commentary-block,
    .word-meanings-container {
        padding: 24px;
        border-radius: 12px;
    }
}

.verse-card {
    padding: 40px 32px;
    cursor: pointer;
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.4s;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    border-radius: 12px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
}

.verse-card:hover {
    transform: translateY(-4px);
    border-color: var(--glass-border);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.05);
}

.verse-number {
    font-size: 1.1rem;
    color: var(--accent-color);
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    margin-bottom: 12px;
    letter-spacing: 2px;
}

.verse-snippet {
    font-size: 1.25rem;
    line-height: 1.8;
    color: var(--text-primary);
    font-family: 'Yatra One', system-ui, sans-serif;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    line-clamp: 4;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 12px 28px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 500;
    font-size: 1rem;
    margin-bottom: 40px;
    transition: all 0.4s;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.back-btn:hover {
    background: var(--text-primary);
    color: var(--bg-color);
    transform: translateX(-5px);
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 900px) {
    .app-navbar {
        width: 95%;
        padding: 12px 20px;
        top: 10px;
    }

    .content-scroll {
        padding: 20px 24px 60px 24px;
    }

    .home-hero h2 {
        font-size: 2.2rem;
    }

    .chapter-detail {
        padding: 0 10px;
    }
}