/**
 * 灵异故事网站 - 主样式文件
 * 暗黑主题 + 胶片颗粒质感
 */

/* ==================== 基础变量 ==================== */
:root {
    /* 颜色系统 */
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #141414;
    --color-bg-tertiary: #1a1a1a;
    --color-bg-card: #1f1f1f;
    
    --color-text-primary: #e8e8e8;
    --color-text-secondary: #a0a0a0;
    --color-text-muted: #666666;
    
    --color-accent: #8b0000;
    --color-accent-light: #b22222;
    --color-accent-dark: #5c0000;
    
    --color-border: #2a2a2a;
    --color-border-light: #333333;
    
    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Noto Serif SC', 'Source Han Serif SC', 'SimSun', serif;
    --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(139, 0, 0, 0.3);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    
    /* 最大宽度 */
    --max-width: 1200px;
    --max-width-narrow: 800px;
    --max-width-wide: 1400px;
}

/* ==================== 重置样式 ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

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

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

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

button {
    cursor: pointer;
    border: none;
    background: none;
    font-family: inherit;
    color: inherit;
}

ul, ol {
    list-style: none;
}

input, textarea {
    font-family: inherit;
    font-size: inherit;
}

/* ==================== 胶片颗粒效果 ==================== */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
}

/* ==================== 布局 ==================== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

/* ==================== 导航栏 ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.hidden {
    transform: translateY(-100%);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--color-accent);
}

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

.nav-link {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    position: relative;
    padding: var(--spacing-sm) 0;
}

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

.nav-link:hover {
    color: var(--color-text-primary);
}

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

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

.search-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    transition: all var(--transition-fast);
}

.search-btn:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-border-light);
    color: var(--color-text-primary);
}

.search-btn kbd {
    padding: 2px 6px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-family: var(--font-mono);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-fast);
}

/* ==================== Hero区域 ==================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 60px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%) brightness(0.3);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        to bottom,
        rgba(10, 10, 10, 0.3) 0%,
        rgba(10, 10, 10, 0.6) 50%,
        rgba(10, 10, 10, 1) 100%
    );
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    letter-spacing: 0.1em;
    text-shadow: 0 0 40px rgba(139, 0, 0, 0.5);
}

.hero-title span {
    color: var(--color-accent);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background: var(--color-accent);
    color: white;
    border: none;
}

.btn-primary:hover {
    background: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: white;
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
}

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

/* ==================== 分类区域 ==================== */
.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--color-accent);
}

.section-desc {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: var(--spacing-lg) auto 0;
}

/* 手风琴分类 */
.categories-accordion {
    display: grid;
    gap: var(--spacing-md);
}

.category-item {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
}

.category-item:hover {
    border-color: var(--color-border-light);
    box-shadow: var(--shadow-md);
}

.category-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg) var(--spacing-xl);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.category-header:hover {
    background: var(--color-bg-tertiary);
}

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

.category-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    font-size: 1.25rem;
}

.category-name {
    font-size: 1.1rem;
    font-weight: 600;
}

.category-count {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.category-arrow {
    width: 24px;
    height: 24px;
    color: var(--color-text-muted);
    transition: transform var(--transition-normal);
}

.category-item.active .category-arrow {
    transform: rotate(180deg);
}

.category-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.category-item.active .category-content {
    max-height: 500px;
}

.category-stories {
    padding: 0 var(--spacing-xl) var(--spacing-lg);
}

.category-story-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
}

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

.category-story-title {
    font-size: 0.95rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.category-story-item:hover .category-story-title {
    color: var(--color-text-primary);
}

.category-story-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ==================== 故事卡片 ==================== */
.stories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.story-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-normal);
    display: flex;
    flex-direction: column;
}

.story-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-border-light);
}

.story-card-image {
    position: relative;
    height: 180px;
    overflow: hidden;
}

.story-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    filter: grayscale(60%);
}

.story-card:hover .story-card-image img {
    transform: scale(1.05);
    filter: grayscale(30%);
}

.story-card-badge {
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-md);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: var(--color-accent);
    color: white;
    font-size: 0.75rem;
    border-radius: var(--radius-sm);
}

.story-card-content {
    padding: var(--spacing-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.story-card-category {
    font-size: 0.8rem;
    color: var(--color-accent-light);
    margin-bottom: var(--spacing-sm);
}

.story-card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.story-card-summary {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
    flex: 1;
}

.story-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.story-card-stats {
    display: flex;
    gap: var(--spacing-md);
}

.story-card-stat {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ==================== 搜索模态框 ==================== */
.search-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(10px);
    z-index: 2000;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    padding-top: 15vh;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
}

.search-modal.active {
    opacity: 1;
    visibility: visible;
}

.search-container {
    width: 90%;
    max-width: 600px;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transform: scale(0.95);
    transition: transform var(--transition-normal);
}

.search-modal.active .search-container {
    transform: scale(1);
}

.search-input-wrapper {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.search-input-wrapper svg {
    color: var(--color-text-muted);
    margin-right: var(--spacing-md);
}

.search-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--color-text-primary);
    font-size: 1.1rem;
    outline: none;
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-close {
    padding: var(--spacing-sm);
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.search-close:hover {
    color: var(--color-text-primary);
}

.search-results {
    max-height: 400px;
    overflow-y: auto;
}

.search-result-item {
    display: flex;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    transition: background var(--transition-fast);
    cursor: pointer;
}

.search-result-item:hover {
    background: var(--color-bg-tertiary);
}

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

.search-result-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    margin-right: var(--spacing-md);
    color: var(--color-text-muted);
}

.search-result-info {
    flex: 1;
}

.search-result-title {
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 2px;
}

.search-result-meta {
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

.search-empty {
    padding: var(--spacing-2xl);
    text-align: center;
    color: var(--color-text-muted);
}

.search-footer {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-bg-tertiary);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    display: flex;
    justify-content: space-between;
}

.search-shortcuts {
    display: flex;
    gap: var(--spacing-md);
}

.search-shortcuts kbd {
    padding: 2px 6px;
    background: var(--color-bg-card);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0 var(--spacing-xl);
}

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

.footer-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.footer-section p,
.footer-section a {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.footer-section a {
    display: block;
    transition: color var(--transition-fast);
}

.footer-section a:hover {
    color: var(--color-accent-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* ==================== 响应式设计 ==================== */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-lg);
        border-bottom: 1px solid var(--color-border);
        gap: var(--spacing-md);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: flex;
    }
    
    .search-btn span,
    .search-btn kbd {
        display: none;
    }
    
    .hero-actions {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }
    
    .btn {
        width: 100%;
    }
    
    .stories-grid {
        grid-template-columns: 1fr;
    }
    
    .category-header {
        padding: var(--spacing-md);
    }
    
    .category-icon {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-lg: 0.75rem;
        --spacing-xl: 1rem;
        --spacing-2xl: 1.5rem;
        --spacing-3xl: 2rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
}

/* ==================== 工具类 ==================== */
.text-center {
    text-align: center;
}

.text-muted {
    color: var(--color-text-muted);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}