/* ============================================
   暖暖影院 - 治愈系·温情陪伴 主题样式
   风格：暖色调 / 治愈系 / 毛玻璃 / 圆角卡片
   ============================================ */

/* CSS变量 & 主题切换 */
:root {
    --bg-primary: #fdf6f0;
    --bg-secondary: #f7ede4;
    --bg-tertiary: #f0e2d6;
    --bg-card: rgba(255, 255, 255, 0.85);
    --bg-card-solid: #fffdfb;
    --bg-glass: rgba(255, 255, 255, 0.4);
    --text-primary: #2d2a26;
    --text-secondary: #4a4238;
    --text-muted: #6b5d4f;
    --text-heading: #1f1a15;
    --accent: #c17f59;
    --accent-light: #d9a07e;
    --accent-dark: #8b4e2c;
    --accent-glow: rgba(193, 127, 89, 0.2);
    --border-light: #e6d6c8;
    --border-glass: rgba(255, 255, 255, 0.6);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --shadow-glow: 0 0 30px var(--accent-glow);
    --nav-bg: rgba(253, 246, 240, 0.8);
    --footer-bg: #2c1e14;
    --footer-text: #e8ddd2;
    --footer-heading: #fff;
    --btn-text: #fff;
    --radius-sm: 12px;
    --radius-md: 20px;
    --radius-lg: 32px;
    --radius-full: 999px;
    --blur: blur(20px);
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-hero: linear-gradient(135deg, #fdf6f0 0%, #f7ede4 50%, #f0e2d6 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.7));
    --gradient-accent: linear-gradient(135deg, var(--accent-light), var(--accent));
}

[data-theme="dark"] {
    --bg-primary: #1a1714;
    --bg-secondary: #241f1b;
    --bg-tertiary: #2d2722;
    --bg-card: rgba(40, 35, 31, 0.9);
    --bg-card-solid: #2d2722;
    --bg-glass: rgba(40, 35, 31, 0.5);
    --text-primary: #e8e0d6;
    --text-secondary: #c9beb0;
    --text-muted: #a89b8c;
    --text-heading: #f5f0ea;
    --accent: #d4a082;
    --accent-light: #e8bca0;
    --accent-dark: #f0c9b0;
    --accent-glow: rgba(212, 160, 130, 0.25);
    --border-light: #3d342c;
    --border-glass: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    --nav-bg: rgba(26, 23, 20, 0.85);
    --footer-bg: #0f0c0a;
    --footer-text: #c4b8ac;
    --footer-heading: #e8ddd2;
    --gradient-hero: linear-gradient(135deg, #1a1714 0%, #241f1b 50%, #2d2722 100%);
    --gradient-card: linear-gradient(145deg, rgba(45,39,34,0.95), rgba(40,35,31,0.8));
}

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-primary);
    background-image: 
        radial-gradient(circle at 20% 30%, var(--accent-glow), transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(193, 127, 89, 0.08), transparent 50%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
    transition: background 0.4s ease, color 0.3s ease;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========== 滚动条美化 ========== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--accent);
    border-radius: 8px;
    border: 2px solid var(--bg-secondary);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-dark);
}

::selection {
    background: var(--accent);
    color: #fff;
}

/* ========== 通用容器 ========== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }
}

/* ========== 导航栏 ========== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: var(--blur);
    -webkit-backdrop-filter: var(--blur);
    border-bottom: 1px solid var(--border-light);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    gap: 20px;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-heading);
    text-decoration: none;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--accent-dark), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all var(--transition-fast);
}

.logo span {
    font-weight: 300;
    font-size: 1.4rem;
    -webkit-text-fill-color: var(--accent);
}

.logo:hover {
    transform: scale(1.02);
    filter: drop-shadow(0 2px 8px var(--accent-glow));
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    position: relative;
    background: transparent;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
    transition: width var(--transition-smooth);
}

.nav-links a:hover, .nav-links a:focus-visible {
    color: var(--accent-dark);
    background: var(--accent-glow);
}

.nav-links a:hover::after, .nav-links a:focus-visible::after {
    width: 60%;
}

.nav-actions {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    padding: 4px 6px 4px 20px;
    border: 1px solid var(--border-light);
    backdrop-filter: var(--blur);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: var(--shadow-glow);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px 0;
    font-size: 0.9rem;
    outline: none;
    color: var(--text-primary);
    width: 160px;
    transition: width var(--transition-smooth);
}

.search-box input::placeholder {
    color: var(--text-muted);
    opacity: 0.7;
}

.search-box button {
    background: var(--gradient-accent);
    border: none;
    border-radius: var(--radius-full);
    padding: 8px 18px;
    color: var(--btn-text);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.search-box button:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

/* 主题切换 & 菜单按钮 */
.theme-toggle, .menu-toggle {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    padding: 10px 14px;
    font-size: 1rem;
    cursor: pointer;
    color: var(--text-heading);
    line-height: 1;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: var(--blur);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:hover, .menu-toggle:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.menu-toggle {
    display: none;
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    flex-direction: column;
    background: var(--bg-card);
    backdrop-filter: var(--blur);
    border-top: 1px solid var(--border-light);
    padding: 16px 24px 24px;
    gap: 4px;
    animation: slideDown 0.3s ease;
}

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

.mobile-menu a {
    padding: 12px 16px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.mobile-menu a:hover {
    background: var(--accent-glow);
    color: var(--accent-dark);
    padding-left: 24px;
}

/* ========== 面包屑 ========== */
.breadcrumb {
    padding: 20px 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.breadcrumb a:hover {
    color: var(--accent-dark);
    text-decoration: underline;
}

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

/* ========== HERO 区域 ========== */
.hero {
    background: var(--gradient-hero);
    padding: 60px 0 80px;
    position: relative;
    overflow: hidden;
    margin-bottom: 20px;
}

/* 背景装饰 */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow), transparent 70%);
    animation: float 8s ease-in-out infinite;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(193, 127, 89, 0.1), transparent 70%);
    animation: float 6s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(5deg);
    }
}

.hero-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.hero-text {
    flex: 1 1 400px;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-text h1 {
    font-size: clamp(2rem, 4vw, 3.2rem);
    font-weight: 800;
    color: var(--text-heading);
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-text h1 .accent {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    display: inline-block;
}

.hero-text h1 .accent::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 4px;
    transform: scaleX(0);
    transform-origin: left;
    animation: slideIn 0.8s ease 0.3s forwards;
}

@keyframes slideIn {
    to {
        transform: scaleX(1);
    }
}

.hero-text p {
    font-size: clamp(1rem, 1.5vw, 1.2rem);
    color: var(--text-secondary);
    margin-bottom: 32px;
    max-width: 560px;
    line-height: 1.8;
}

.btn-group {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    background: var(--gradient-accent);
    color: var(--btn-text);
    padding: 14px 32px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    border: none;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px var(--accent-glow);
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.8s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px var(--accent-glow);
    color: #fff;
}

.btn:active {
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--accent);
    color: var(--accent-dark);
    box-shadow: none;
    backdrop-filter: var(--blur);
}

.btn-outline::before {
    display: none;
}

.btn-outline:hover {
    background: var(--accent);
    color: #fff;
    box-shadow: 0 8px 25px var(--accent-glow);
}

.hero-image {
    flex: 1 1 300px;
    min-width: 260px;
    position: relative;
    animation: fadeInScale 1s ease 0.2s both;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.9) rotate(-2deg);
    }
    to {
        opacity: 1;
        transform: scale(1) rotate(0);
    }
}

.hero-image svg {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-smooth);
    filter: drop-shadow(0 10px 30px var(--accent-glow));
}

.hero-image svg:hover {
    transform: scale(1.02) rotate(1deg);
}

/* ========== 通用区块标题 ========== */
.section-title {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    color: var(--text-heading);
    margin: 50px 0 30px;
    position: relative;
    padding-bottom: 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.section-title::before {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 4px;
    transition: width var(--transition-smooth);
}

.section-title:hover::before {
    width: 140px;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    height: 1px;
    background: var(--border-light);
    opacity: 0.5;
}

/* ========== 卡片网格 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin: 30px 0;
}

.card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    backdrop-filter: var(--blur);
    transition: all var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-smooth);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent);
}

.card:hover::before {
    transform: scaleX(1);
}

.card h3 {
    font-size: 1.3rem;
    color: var(--text-heading);
    margin-bottom: 16px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 10px;
}

.card h3 span {
    font-size: 1.5rem;
}

.card p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.7;
}

.card a {
    color: var(--accent-dark);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.card a:hover {
    color: var(--accent);
    text-decoration: underline;
    gap: 8px;
}

/* ========== 文章列表 ========== */
.article-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.article-item {
    background: var(--bg-card);
    padding: 24px 28px;
    border-radius: var(--radius-md);
    border-left: 6px solid var(--accent);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
    backdrop-filter: var(--blur);
    position: relative;
    overflow: hidden;
}

.article-item::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100%;
    background: linear-gradient(90deg, transparent, var(--accent-glow));
    opacity: 0;
    transition: opacity var(--transition-smooth);
}

.article-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
    border-left-color: var(--accent-dark);
}

.article-item:hover::after {
    opacity: 1;
}

.article-item h4 {
    font-size: 1.2rem;
    color: var(--text-heading);
    margin-bottom: 8px;
    font-weight: 600;
    transition: color var(--transition-fast);
    position: relative;
    z-index: 1;
}

.article-item:hover h4 {
    color: var(--accent-dark);
}

.article-item .meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin: 8px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

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

.article-item p {
    color: var(--text-secondary);
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
}

.read-more {
    color: var(--accent-dark);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    position: relative;
    z-index: 1;
}

.read-more:hover {
    color: var(--accent);
    gap: 8px;
    text-decoration: underline;
}

/* ========== FAQ 折叠面板 ========== */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-list details {
    background: var(--bg-card);
    padding: 20px 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-light);
    backdrop-filter: var(--blur);
    transition: all var(--transition-smooth);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-list details:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.faq-list details[open] {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}

.faq-list summary {
    font-weight: 600;
    color: var(--text-heading);
    cursor: pointer;
    font-size: 1.05rem;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    transition: color var(--transition-fast);
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--accent);
    transition: transform var(--transition-smooth);
    flex-shrink: 0;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-glow);
    border-radius: 50%;
}

.faq-list details[open] summary::after {
    transform: rotate(45deg);
    background: var(--accent);
    color: #fff;
}

.faq-list summary:hover {
    color: var(--accent-dark);
}

.faq-list p {
    color: var(--text-secondary);
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-light);
    line-height: 1.8;
    animation: fadeInDown 0.3s ease;
}

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

/* ========== HowTo 指南 ========== */
.howto-box {
    background: var(--gradient-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    margin: 40px 0;
    border: 1px solid var(--border-light);
    backdrop-filter: var(--blur);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

.howto-box::before {
    content: '🎬';
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 4rem;
    opacity: 0.1;
    animation: float 6s ease-in-out infinite;
}

.howto-box h2 {
    margin-top: 0;
}

.howto-box p {
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.howto-box strong {
    color: var(--text-heading);
}

.howto-box ol {
    color: var(--text-secondary);
    padding-left: 24px;
    margin: 16px 0;
    counter-reset: howto;
}

.howto-box ol li {
    margin-bottom: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--accent);
    transition: all var(--transition-fast);
    list-style: none;
    counter-increment: howto;
    position: relative;
    padding-left: 48px;
}

.howto-box ol li::before {
    content: counter(howto);
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
}

.howto-box ol li:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-sm);
}

/* ========== Footer ========== */
footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: 60px 0 20px;
    margin-top: 80px;
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-accent);
}

footer h4 {
    color: var(--footer-heading);
    font-size: 1.2rem;
    margin-bottom: 16px;
    font-weight: 600;
    position: relative;
    padding-bottom: 8px;
}

footer h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

footer a {
    color: var(--footer-text);
    text-decoration: none;
    opacity: 0.9;
    transition: all var(--transition-fast);
}

footer a:hover {
    color: #fff;
    text-decoration: underline;
    opacity: 1;
    padding-left: 4px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-grid p {
    color: var(--footer-text);
    opacity: 0.8;
    line-height: 1.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 30px;
    padding-top: 24px;
    font-size: 0.9rem;
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 12px;
    color: var(--footer-text);
    opacity: 0.7;
}

.footer-bottom a {
    color: var(--footer-text);
}

.footer-bottom a:hover {
    color: #fff;
}

/* ========== 返回顶部 ========== */
#backTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--gradient-accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
    cursor: pointer;
    z-index: 999;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-smooth);
    opacity: 0;
    transform: translateY(20px);
}

#backTop.show {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

#backTop:hover {
    transform: translateY(-4px) scale(1.1);
    box-shadow: var(--shadow-glow);
}

/* ========== 滚动显示动画 ========== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 交错动画 */
.reveal:nth-child(2) {
    transition-delay: 0.1s;
}

.reveal:nth-child(3) {
    transition-delay: 0.2s;
}

.reveal:nth-child(4) {
    transition-delay: 0.3s;
}

/* ========== 数字动画 ========== */
.stat-num {
    font-size: 2.5rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .hero-text h1 {
        font-size: 2.4rem;
    }
    
    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }
}

@media (max-width: 768px) {
    .nav-links, .search-box {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .mobile-menu.open {
        display: flex;
    }
    
    .container {
        padding: 0 20px;
    }
    
    .hero {
        padding: 40px 0 60px;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-content {
        gap: 30px;
    }
    
    .hero-image {
        min-width: 200px;
    }
    
    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }
    
    .article-item {
        padding: 20px;
    }
    
    .howto-box {
        padding: 24px;
    }
    
    .howto-box::before {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    
    #backTop {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .btn-group {
        flex-direction: column;
        width: 100%;
    }
    
    .btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    
    .hero-text h1 {
        font-size: 1.8rem;
    }
    
    .section-title {
        font-size: 1.4rem;
    }
    
    .nav-container {
        padding: 12px 16px;
    }
    
    .logo {
        font-size: 1.5rem;
    }
    
    .theme-toggle {
        padding: 8px 12px;
    }
}

/* ========== 暗色模式适配 ========== */
[data-theme="dark"] .card {
    background: var(--bg-card);
    border-color: var(--border-light);
}

[data-theme="dark"] .card:hover {
    border-color: var(--accent);
}

[data-theme="dark"] .article-item {
    background: var(--bg-card);
}

[data-theme="dark"] .btn-outline {
    color: var(--accent-dark);
}

[data-theme="dark"] .btn-outline:hover {
    color: #fff;
}

[data-theme="dark"] .faq-list details {
    background: var(--bg-card);
}

[data-theme="dark"] .howto-box {
    background: var(--bg-card);
}

[data-theme="dark"] .search-box input {
    color: var(--text-primary);
}

/* ========== 无障碍 ========== */
:focus-visible {
    outline: 3px solid var(--accent);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ========== 打印样式 ========== */
@media print {
    .navbar, .hero, .breadcrumb, #backTop, .theme-toggle, .menu-toggle, .search-box {
        display: none !important;
    }
    
    body {
        background: #fff;
        color: #000;
    }
    
    .card, .article-item, .faq-list details, .howto-box {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid #ddd;
    }
}