/* 
 * Story Platform - Main Stylesheet
 * Features: Dark/Light Mode, Book Mode, Responsive Design
 */

@import url('https://fonts.googleapis.com/css2?family=Crimson+Pro:ital,wght@0,400;0,500;0,600;0,700;1,400;1,500&family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;500;600&display=swap');

/* CSS Variables */
:root {
    /* Light Theme */
    --bg-primary: #faf9f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f5f3f0;
    --text-primary: #2c2c2c;
    --text-secondary: #5a5a5a;
    --text-muted: #8a8a8a;
    --accent: #8b4513;
    --accent-hover: #a0522d;
    --accent-soft: rgba(139, 69, 19, 0.1);
    --border: #e5e2dc;
    --shadow: rgba(0, 0, 0, 0.08);
    --shadow-heavy: rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --font-body: 'Crimson Pro', Georgia, serif;
    --font-heading: 'Libre Baskerville', 'Times New Roman', serif;
    --font-ui: 'Source Sans 3', -apple-system, sans-serif;
    
    /* Spacing */
    --content-width: 720px;
    --content-width-wide: 960px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    --spacing-xl: 4rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
}

/* Dark Theme */
[data-theme="dark"] {
    --bg-primary: #1a1a1d;
    --bg-secondary: #242428;
    --bg-tertiary: #2d2d32;
    --text-primary: #e8e6e3;
    --text-secondary: #b0ada8;
    --text-muted: #7a7875;
    --accent: #d4a574;
    --accent-hover: #e6b989;
    --accent-soft: rgba(212, 165, 116, 0.15);
    --border: #3d3d42;
    --shadow: rgba(0, 0, 0, 0.3);
    --shadow-heavy: rgba(0, 0, 0, 0.5);
}

/* Book Mode (Sepia) */
[data-theme="book"] {
    --bg-primary: #f4ecd8;
    --bg-secondary: #faf6eb;
    --bg-tertiary: #ebe4d0;
    --text-primary: #433422;
    --text-secondary: #5c4a35;
    --text-muted: #8a7a65;
    --accent: #8b4513;
    --accent-hover: #a0522d;
    --accent-soft: rgba(139, 69, 19, 0.12);
    --border: #d4cbb8;
    --shadow: rgba(67, 52, 34, 0.1);
    --shadow-heavy: rgba(67, 52, 34, 0.2);
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 1.875rem; letter-spacing: -0.01em; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-md);
}

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

a:hover {
    color: var(--accent-hover);
}

/* Layout */
.container {
    width: 100%;
    max-width: var(--content-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: var(--content-width-wide);
}

/* Header */
.site-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: all var(--transition-normal);
}

.header-inner {
    max-width: var(--content-width-wide);
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.site-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.site-logo svg {
    width: 28px;
    height: 28px;
    fill: var(--accent);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 4px;
    gap: 2px;
}

.theme-btn {
    background: transparent;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
    font-family: var(--font-ui);
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all var(--transition-fast);
}

.theme-btn svg {
    width: 16px;
    height: 16px;
}

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

.theme-btn.active {
    background: var(--bg-secondary);
    color: var(--accent);
    box-shadow: 0 2px 4px var(--shadow);
}

/* Main Content */
main {
    padding: var(--spacing-xl) 0;
    min-height: calc(100vh - 200px);
}

/* Hero Section */
.hero {
    text-align: center;
    padding: var(--spacing-xl) 0;
    margin-bottom: var(--spacing-xl);
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    font-style: italic;
}

/* Story Cards */
.stories-grid {
    display: grid;
    gap: var(--spacing-lg);
}

.story-card {
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: var(--spacing-lg);
    border: 1px solid var(--border);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.story-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.story-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px var(--shadow-heavy);
}

.story-card:hover::before {
    opacity: 1;
}

.story-card h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
}

.story-card h2 a {
    color: var(--text-primary);
}

.story-card h2 a:hover {
    color: var(--accent);
}

.story-meta {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.story-meta span {
    display: flex;
    align-items: center;
    gap: 4px;
}

.story-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.story-chapters-preview {
    border-top: 1px solid var(--border);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.story-chapters-preview h4 {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

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

.chapter-list li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--border);
}

.chapter-list li:last-child {
    border-bottom: none;
}

.chapter-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.chapter-list a:hover {
    color: var(--accent);
}

.chapter-number {
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--accent);
    min-width: 60px;
}

/* Reading View */
.reading-header {
    text-align: center;
    padding-bottom: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.reading-header .breadcrumb {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.reading-header .breadcrumb a {
    color: var(--text-muted);
}

.reading-header .breadcrumb a:hover {
    color: var(--accent);
}

.chapter-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.chapter-info {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Reading Content */
.reading-content {
    font-size: 1.1rem;
    line-height: 1.85;
}

.reading-content p {
    margin-bottom: 1.5em;
    text-align: justify;
    hyphens: auto;
}

.reading-content p:first-of-type::first-letter {
    font-size: 3.5em;
    float: left;
    line-height: 0.8;
    padding-right: 0.1em;
    font-family: var(--font-heading);
    color: var(--accent);
}

.reading-content em {
    font-style: italic;
}

.reading-content strong {
    font-weight: 600;
}

/* Chapter Navigation */
.chapter-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
    gap: var(--spacing-md);
}

.chapter-nav-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: 8px;
    color: var(--text-secondary);
    font-family: var(--font-ui);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.chapter-nav-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

.chapter-nav-btn.disabled {
    opacity: 0.4;
    pointer-events: none;
}

.chapter-nav-btn svg {
    width: 20px;
    height: 20px;
}

/* Reading Progress */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--accent);
    z-index: 1000;
    transition: width 0.1s linear;
}

/* Font Size Control */
.font-size-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-ui);
}

.font-size-btn {
    background: var(--bg-tertiary);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.font-size-btn:hover {
    background: var(--accent-soft);
    color: var(--accent);
}

/* Story Page */
.story-header {
    text-align: center;
    padding-bottom: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--border);
}

.story-header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.story-header .description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    font-style: italic;
    max-width: 600px;
    margin: 0 auto;
}

.chapters-section h2 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 500;
}

.chapters-full-list {
    list-style: none;
}

.chapters-full-list li {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-fast);
}

.chapters-full-list li:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 12px var(--shadow);
}

.chapters-full-list a {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    color: var(--text-primary);
}

.chapter-title-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chapter-num {
    font-family: var(--font-ui);
    font-weight: 600;
    color: var(--accent);
    min-width: 70px;
}

.chapter-date {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Footer */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
}

.footer-inner {
    max-width: var(--content-width-wide);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    text-align: center;
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Ornaments */
.ornament {
    text-align: center;
    color: var(--text-muted);
    font-size: 1.5rem;
    margin: var(--spacing-lg) 0;
    opacity: 0.5;
}

.ornament::before {
    content: '❧';
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--text-muted);
}

.empty-state svg {
    width: 80px;
    height: 80px;
    margin-bottom: var(--spacing-md);
    opacity: 0.3;
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 16px;
    }
    
    .header-inner {
        flex-wrap: wrap;
    }
    
    .site-nav {
        order: 3;
        width: 100%;
        justify-content: center;
        padding-top: var(--spacing-sm);
        border-top: 1px solid var(--border);
        margin-top: var(--spacing-sm);
    }
    
    .theme-toggle {
        order: 2;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .story-card {
        padding: var(--spacing-md);
    }
    
    .chapter-nav {
        flex-direction: column;
    }
    
    .chapter-nav-btn {
        width: 100%;
        justify-content: center;
    }
    
    .reading-content p:first-of-type::first-letter {
        font-size: 2.5em;
    }
}

/* Print Styles */
@media print {
    .site-header,
    .site-footer,
    .theme-toggle,
    .chapter-nav,
    .reading-progress {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .reading-content {
        font-size: 12pt;
        line-height: 1.6;
    }
}

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

.story-card,
.chapters-full-list li {
    animation: fadeIn 0.4s ease backwards;
}

.story-card:nth-child(1) { animation-delay: 0.1s; }
.story-card:nth-child(2) { animation-delay: 0.2s; }
.story-card:nth-child(3) { animation-delay: 0.3s; }

.chapters-full-list li:nth-child(1) { animation-delay: 0.05s; }
.chapters-full-list li:nth-child(2) { animation-delay: 0.1s; }
.chapters-full-list li:nth-child(3) { animation-delay: 0.15s; }
.chapters-full-list li:nth-child(4) { animation-delay: 0.2s; }
.chapters-full-list li:nth-child(5) { animation-delay: 0.25s; }