/**
 * AudioBiblia - Estilos Principales
 * Color principal: #800000 (Burdeo/Vino)
 * Diseño: Moderno, elegante, espiritual
 */

/* ============================================
   Variables CSS
   ============================================ */
:root {
    /* Colores principales */
    --color-primary: #800000;
    --color-primary-light: #a62f2f;
    --color-primary-dark: #5a0000;
    --color-secondary: #d4af37;
    --color-accent: #c19a6b;
    
    /* Tonos neutros */
    --color-bg: #faf8f5;
    --color-surface: #ffffff;
    --color-text: #2c2416;
    --color-text-light: #6b5d4f;
    --color-border: #e8dfd4;
    --color-shadow: rgba(128, 0, 0, 0.08);
    
    /* Estados */
    --color-success: #2d5016;
    --color-warning: #b8860b;
    --color-info: #4a5568;
    
    /* Tipografía */
    --font-display: 'Cinzel', serif;
    --font-heading: 'Libre Baskerville', serif;
    --font-body: 'Crimson Pro', serif;
    
    /* Espaciado */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Bordes */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Sombras */
    --shadow-sm: 0 1px 2px 0 rgba(128, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(128, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(128, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(128, 0, 0, 0.15);
    
    /* Transiciones */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ============================================
   Reset y Base
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    color: var(--color-primary-dark);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-light);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: all var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ============================================
   Utilidades
   ============================================ */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.view {
    display: none;
    animation: fadeIn var(--transition-slow);
}

.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Header
   ============================================ */
.site-header {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-lg);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.logo-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.logo-text h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: white;
    letter-spacing: 0.05em;
    margin: 0;
}

.logo-subtitle {
    font-size: 0.75rem;
    opacity: 0.9;
    font-weight: 300;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-top: -0.25rem;
}

.main-nav {
    display: flex;
    gap: var(--spacing-xs);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-lg);
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    position: relative;
    overflow: hidden;
}

.nav-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%);
    transition: transform var(--transition-base);
}

.nav-btn:hover::before {
    transform: translateX(0);
}

.nav-btn.active {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.nav-btn .icon {
    font-size: 1.25rem;
    position: relative;
    z-index: 1;
}

.nav-btn .label {
    position: relative;
    z-index: 1;
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    background: linear-gradient(135deg, 
        rgba(128, 0, 0, 0.03) 0%, 
        rgba(212, 175, 55, 0.03) 100%),
        url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(128,0,0,0.03)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    padding: var(--spacing-2xl) 0;
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    border: 1px solid var(--color-border);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    transition: all var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.stat-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* ============================================
   Secciones
   ============================================ */
.section-title {
    font-family: var(--font-display);
    font-size: 1.875rem;
    margin-bottom: var(--spacing-lg);
    text-align: center;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--color-secondary), 
        transparent);
    border-radius: 2px;
}

.page-title {
    font-family: var(--font-display);
    font-size: 2.25rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
    color: var(--color-primary-dark);
}

/* ============================================
   Testamentos Grid
   ============================================ */
.testaments-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.testament-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.testament-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, 
        rgba(128, 0, 0, 0.05) 0%, 
        transparent 70%);
    transform: translate(50%, -50%);
}

.testament-card:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.testament-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.testament-icon {
    font-size: 3rem;
    filter: drop-shadow(0 2px 4px var(--color-shadow));
}

.testament-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-primary-dark);
}

.testament-description {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    position: relative;
    z-index: 1;
}

.testament-stats {
    display: flex;
    justify-content: space-between;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    position: relative;
    z-index: 1;
}

.testament-stat {
    text-align: center;
}

.testament-stat-number {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
}

.testament-stat-label {
    font-size: 0.75rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

.testament-progress {
    margin-top: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.progress-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    display: flex;
    justify-content: space-between;
}

.progress-bar {
    height: 8px;
    background: var(--color-border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, 
        var(--color-primary), 
        var(--color-primary-light));
    border-radius: 4px;
    transition: width var(--transition-slow);
}

/* ============================================
   Libros Grid
   ============================================ */
.biblioteca-header {
    margin-bottom: var(--spacing-xl);
}

.filter-controls {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-select {
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-base);
    min-width: 200px;
}

.filter-select:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(128, 0, 0, 0.1);
}

.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.book-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--color-border);
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.book-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.book-badge {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.book-badge.completado {
    background: var(--color-success);
    color: white;
}

.book-badge.en-progreso {
    background: var(--color-warning);
    color: white;
}

.book-badge.no-iniciado {
    background: var(--color-info);
    color: white;
}

.book-name {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary-dark);
}

.book-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.book-meta span {
    padding: 0.25rem 0.5rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

.book-description {
    font-size: 0.9375rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.book-stats {
    display: flex;
    justify-content: space-between;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-border);
    font-size: 0.875rem;
}

/* ============================================
   Detalle de Libro
   ============================================ */
.book-detail-header {
    background: linear-gradient(135deg, 
        var(--color-primary-dark) 0%, 
        var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: white;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

.back-button:hover {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

.book-detail-title {
    font-family: var(--font-display);
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.book-detail-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.book-detail-meta span {
    padding: 0.375rem 0.75rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.book-detail-description {
    font-size: 1.125rem;
    line-height: 1.8;
    opacity: 0.95;
}

.book-detail-progress {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    backdrop-filter: blur(10px);
}

.chapters-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--spacing-sm);
}

.chapter-card {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
}

.chapter-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.chapter-card.completed {
    background: linear-gradient(135deg, 
        rgba(45, 80, 22, 0.1) 0%, 
        rgba(45, 80, 22, 0.05) 100%);
    border-color: var(--color-success);
}

.chapter-card.in-progress {
    background: linear-gradient(135deg, 
        rgba(184, 134, 11, 0.1) 0%, 
        rgba(184, 134, 11, 0.05) 100%);
    border-color: var(--color-warning);
}

.chapter-number {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.chapter-status {
    font-size: 1.25rem;
    margin-top: var(--spacing-xs);
}

.chapter-card.completed .chapter-status::after {
    content: '✓';
}

.chapter-card.in-progress .chapter-status::after {
    content: '▶';
}

/* ============================================
   Player de Capítulo
   ============================================ */
.player-container {
    max-width: 900px;
    margin: 0 auto;
}

.player-header {
    background: linear-gradient(135deg, 
        var(--color-primary-dark) 0%, 
        var(--color-primary) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.player-title {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    color: white;
}

.player-breadcrumb {
    font-size: 1rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.verse-display {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--color-secondary);
}

.verse-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.verse-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    line-height: 1.8;
    color: var(--color-primary-dark);
    font-style: italic;
}

.audio-player {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--color-border);
}

.audio-element {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    outline: none;
}

.player-controls {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.control-btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
}

.control-btn.primary {
    background: var(--color-primary);
    color: white;
}

.control-btn.primary:hover {
    background: var(--color-primary-light);
    transform: scale(1.05);
}

.control-btn.secondary {
    background: var(--color-bg);
    color: var(--color-primary);
    border: 2px solid var(--color-border);
}

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

.chapter-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xl);
    gap: var(--spacing-md);
}

.nav-chapter-btn {
    flex: 1;
    padding: var(--spacing-md);
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
}

.nav-chapter-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    transform: translateX(0) scale(1.02);
}

.nav-chapter-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.nav-chapter-btn.prev:hover {
    transform: translateX(-3px) scale(1.02);
}

.nav-chapter-btn.next {
    justify-content: flex-end;
}

.nav-chapter-btn.next:hover {
    transform: translateX(3px) scale(1.02);
}

/* ============================================
   Progreso Dashboard
   ============================================ */
.progress-dashboard {
    display: grid;
    gap: var(--spacing-xl);
}

.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.progress-stat-card {
    background: var(--color-surface);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-base);
}

.progress-stat-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.progress-stat-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.progress-stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.progress-stat-label {
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.recent-activity {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 2px solid var(--color-border);
}

.activity-list {
    list-style: none;
}

.activity-item {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition-fast);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-item:hover {
    background: var(--color-bg);
    cursor: pointer;
}

.activity-info {
    flex: 1;
}

.activity-title {
    font-weight: 600;
    color: var(--color-primary-dark);
    margin-bottom: 0.25rem;
}

.activity-date {
    font-size: 0.875rem;
    color: var(--color-text-light);
}

.activity-status {
    font-size: 1.25rem;
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    background: linear-gradient(135deg, 
        var(--color-primary-dark) 0%, 
        var(--color-primary) 100%);
    color: white;
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
}

.footer-links a:hover {
    color: white;
    text-decoration: underline;
}

.footer-note {
    font-style: italic;
    opacity: 0.9;
    line-height: 1.7;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ============================================
   Player Flotante
   ============================================ */
.floating-player {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, 
        rgba(128, 0, 0, 0.98) 0%, 
        rgba(128, 0, 0, 0.95) 100%);
    backdrop-filter: blur(10px);
    color: white;
    padding: var(--spacing-md);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    z-index: 999;
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.floating-player.active {
    transform: translateY(0);
}

.floating-player-content {
    max-width: 1280px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-md);
}

.floating-player-info {
    flex: 1;
    min-width: 0;
}

.floating-player-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.floating-player-progress {
    margin-top: var(--spacing-xs);
}

.floating-progress-bar {
    height: 4px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 2px;
    overflow: hidden;
}

.floating-progress-fill {
    height: 100%;
    background: var(--color-secondary);
    width: 0;
    transition: width 0.3s ease;
}

.floating-player-controls {
    display: flex;
    gap: var(--spacing-sm);
}

.floating-btn {
    padding: var(--spacing-sm);
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.floating-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

/* ============================================
   Loading Spinner
   ============================================ */
.loading-spinner {
    position: fixed;
    inset: 0;
    background: rgba(250, 248, 245, 0.9);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Acerca de
   ============================================ */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-section {
    background: var(--color-surface);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    border: 2px solid var(--color-border);
}

.about-section h3 {
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    font-size: 1.5rem;
}

.about-section p {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-section p:last-child {
    margin-bottom: 0;
}

.instruction-list {
    padding-left: var(--spacing-lg);
}

.instruction-list li {
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.instruction-list strong {
    color: var(--color-primary);
}

.copyright {
    text-align: center;
    font-style: italic;
    color: var(--color-text-light);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .main-nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .nav-btn .label {
        display: none;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .testaments-grid,
    .books-grid {
        grid-template-columns: 1fr;
    }
    
    .chapters-grid {
        grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    }
    
    .filter-controls {
        flex-direction: column;
    }
    
    .filter-select {
        width: 100%;
    }
    
    .chapter-navigation {
        flex-direction: column;
    }
    
    .floating-player-title {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    .logo-icon {
        font-size: 2rem;
    }
    
    .logo-text h1 {
        font-size: 1.25rem;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .book-detail-title {
        font-size: 1.75rem;
    }
    
    .player-title {
        font-size: 1.5rem;
    }
    
    .verse-text {
        font-size: 1.125rem;
    }
}

/* ============================================
   Print Styles
   ============================================ */
@media print {
    .site-header,
    .main-nav,
    .site-footer,
    .floating-player,
    .control-btn,
    .filter-controls {
        display: none !important;
    }
    
    body {
        background: white;
    }
    
    .hero-section,
    .testament-card,
    .book-card,
    .verse-display {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}