```css
/* ==========================================================================
   51每日大赛 - 创意作品展示与话题挑战平台
   完整样式表 (Performance Optimized, No External Dependencies)
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. 基础重置与全局变量
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 主色调 - 深海蓝 */
    --primary: #0a3d62;
    --primary-light: #1e6091;
    --primary-dark: #05253d;
    --primary-rgb: 10, 61, 98;

    /* 强调色 - 活力橙 */
    --accent: #e67e22;
    --accent-light: #f39c12;
    --accent-dark: #ca6f1e;
    --accent-rgb: 230, 126, 34;

    /* 背景与卡片 */
    --bg: #f8fafc;
    --bg-alt: #f1f5f9;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.72);
    --bg-glass-border: rgba(255, 255, 255, 0.35);

    /* 文字颜色 */
    --text: #1e293b;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --text-inverse: #ffffff;

    /* 边框与分割 */
    --border: #e2e8f0;
    --border-light: #f1f5f9;

    /* 阴影层级 */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.04);
    --shadow-sm: 0 2px 4px -1px rgba(0, 0, 0, 0.06), 0 1px 2px -1px rgba(0, 0, 0, 0.04);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 12px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
    --shadow-glow: 0 0 20px rgba(230, 126, 34, 0.3);

    /* 圆角 */
    --radius-xs: 4px;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition-fast: all 0.15s ease;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);

    /* 布局 */
    --container-max: 1200px;
    --nav-height: 68px;

    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 40%, var(--primary-light) 100%);
    --gradient-accent: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
    --gradient-hero: linear-gradient(135deg, #05253d 0%, #0a3d62 35%, #1e6091 70%, #2a7ab5 100%);
    --gradient-mesh: radial-gradient(at 20% 30%, rgba(230, 126, 34, 0.25) 0%, transparent 50%),
                     radial-gradient(at 80% 70%, rgba(30, 96, 145, 0.4) 0%, transparent 50%),
                     radial-gradient(at 50% 50%, rgba(10, 61, 98, 0.3) 0%, transparent 60%);
}

/* 暗色模式 */
[data-theme="dark"] {
    --primary: #2a7ab5;
    --primary-light: #3a8fd0;
    --primary-dark: #0a3d62;
    --primary-rgb: 42, 122, 181;

    --accent: #f39c12;
    --accent-light: #f5b041;
    --accent-dark: #e67e22;
    --accent-rgb: 243, 156, 18;

    --bg: #0b1120;
    --bg-alt: #0f172a;
    --bg-card: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.72);
    --bg-glass-border: rgba(255, 255, 255, 0.08);

    --text: #e2e8f0;
    --text-light: #94a3b8;
    --text-lighter: #64748b;
    --text-inverse: #0b1120;

    --border: #334155;
    --border-light: #1e293b;

    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 4px -1px rgba(0, 0, 0, 0.35);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 8px 12px -3px rgba(0, 0, 0, 0.45);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 24px rgba(243, 156, 18, 0.25);

    --gradient-hero: linear-gradient(135deg, #0a3d62 0%, #1e6091 50%, #2a7ab5 100%);
    --gradient-mesh: radial-gradient(at 20% 30%, rgba(243, 156, 18, 0.15) 0%, transparent 50%),
                     radial-gradient(at 80% 70%, rgba(42, 122, 181, 0.3) 0%, transparent 50%),
                     radial-gradient(at 50% 50%, rgba(10, 61, 98, 0.4) 0%, transparent 60%);
}

/* --------------------------------------------------------------------------
   2. HTML 与 Body 基础
   -------------------------------------------------------------------------- */
html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
        sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.8;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}
::-webkit-scrollbar-track {
    background: var(--bg-alt);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-alt);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* 选中高亮 */
::selection {
    background: var(--accent);
    color: #fff;
    text-shadow: none;
}

/* --------------------------------------------------------------------------
   3. 通用元素
   -------------------------------------------------------------------------- */
a {
    color: var(--primary-light);
    text-decoration: none;
    transition: var(--transition-fast);
    position: relative;
}

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

a:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: var(--radius-xs);
}

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
}

button:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* 容器 */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}

/* 通用文本工具 */
.text-center {
    text-align: center;
}

/* --------------------------------------------------------------------------
   4. 导航栏 - 毛玻璃吸顶
   -------------------------------------------------------------------------- */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.02);
}

.navbar:hover {
    box-shadow: var(--shadow-sm);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--nav-height);
    gap: 16px;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.35rem;
    color: var(--primary);
    letter-spacing: -0.5px;
    transition: var(--transition);
    flex-shrink: 0;
}

.logo:hover {
    color: var(--primary);
    transform: scale(1.02);
}

.logo svg {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    transition: var(--transition-bounce);
    box-shadow: 0 2px 8px rgba(var(--primary-rgb), 0.25);
}

.logo:hover svg {
    transform: rotate(-6deg) scale(1.08);
    box-shadow: 0 4px 14px rgba(var(--accent-rgb), 0.4);
}

/* 导航链接 */
.nav-links {
    display: flex;
    gap: 4px;
    align-items: center;
    flex-wrap: nowrap;
}

.nav-links a {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.nav-links a::after {
    content: "";
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent);
    border-radius: var(--radius-full);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-1px);
}

.nav-links a:hover::after {
    width: 60%;
    background: var(--accent-light);
}

/* 导航右侧操作区 */
.nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

/* 主题切换与菜单按钮 */
.theme-toggle,
.menu-toggle {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text);
    transition: var(--transition);
    width: 38px;
    height: 38px;
}

.theme-toggle:hover,
.menu-toggle:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: var(--shadow-sm);
}

.theme-toggle:active,
.menu-toggle:active {
    transform: scale(0.94);
}

.theme-toggle svg,
.menu-toggle svg {
    width: 18px;
    height: 18px;
    transition: transform 0.4s ease;
}

.theme-toggle:hover svg {
    transform: rotate(25deg);
}

.menu-toggle {
    display: none;
}

/* 搜索框 */
.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    padding: 4px 6px 4px 14px;
    gap: 6px;
    transition: var(--transition);
}

.search-box:focus-within {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(var(--primary-rgb), 0.12);
    background: var(--bg-card);
}

.search-box input {
    border: none;
    background: transparent;
    outline: none;
    font-size: 0.88rem;
    width: 120px;
    color: var(--text);
    transition: width 0.3s ease;
}

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

.search-box input:focus {
    width: 150px;
}

.search-box button {
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4px;
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

.search-box button:hover {
    color: var(--accent);
    background: rgba(var(--accent-rgb), 0.1);
}

/* --------------------------------------------------------------------------
   5. 移动菜单
   -------------------------------------------------------------------------- */
.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-glass);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
    flex-direction: column;
    gap: 4px;
    z-index: 999;
    box-shadow: var(--shadow-lg);
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    color: var(--text);
    font-weight: 500;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.mobile-menu a:hover {
    background: var(--primary);
    color: #fff;
    border-left-color: var(--accent);
    padding-left: 20px;
}

/* --------------------------------------------------------------------------
   6. 面包屑
   -------------------------------------------------------------------------- */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.85rem;
    color: var(--text-light);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
}

.breadcrumb a {
    color: var(--text-light);
    transition: var(--transition-fast);
}

.breadcrumb a:hover {
    color: var(--primary);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.breadcrumb span {
    margin: 0 6px;
    color: var(--text-lighter);
}

/* --------------------------------------------------------------------------
   7. Banner 轮播 - 渐变 + 网格纹理
   -------------------------------------------------------------------------- */
.banner {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    margin-bottom: 40px;
    background: var(--gradient-hero);
    min-height: 360px;
    display: flex;
    align-items: center;
    box-shadow: var(--shadow-xl);
    isolation: isolate;
}

/* 网格纹理叠加 */
.banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: 0;
    pointer-events: none;
}

/* 光晕装饰 */
.banner::after {
    content: "";
    position: absolute;
    top: -50%;
    right: -10%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.18) 0%, transparent 60%);
    z-index: 0;
    pointer-events: none;
    animation: floatGlow 8s ease-in-out infinite;
}

@keyframes floatGlow {
    0%, 100% {
        transform: translate(0, 0) scale(1);
        opacity: 0.7;
    }
    50% {
        transform: translate(-5%, 5%) scale(1.1);
        opacity: 1;
    }
}

.banner-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.8s ease;
    display: flex;
    align-items: center;
    padding: 56px 64px;
    color: #fff;
    z-index: 1;
    visibility: hidden;
}

.banner-slide.active {
    opacity: 1;
    position: relative;
    visibility: visible;
}

.banner-content {
    max-width: 680px;
    animation: fadeInUp 0.8s ease both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.banner-content h1 {
    font-size: 2.4rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
    background: linear-gradient(120deg, #fff 0%, #ffe4c4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.banner-content h2 {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
    background: linear-gradient(120deg, #fff 0%, #ffe4c4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.banner-content p {
    font-size: 1.05rem;
    opacity: 0.92;
    margin-bottom: 28px;
    line-height: 1.75;
    color: rgba(255, 255, 255, 0.92);
    text-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
}

.banner-btn {
    display: inline-block;
    padding: 13px 34px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1rem;
    transition: var(--transition-bounce);
    box-shadow: 0 4px 18px rgba(var(--accent-rgb), 0.45);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.banner-btn::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(120deg, transparent 30%, rgba(255, 255, 255, 0.35) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
    z-index: -1;
}

.banner-btn:hover {
    color: #fff;
    transform: translateY(-3px) scale(1.03);
    box-shadow: 0 8px 26px rgba(var(--accent-rgb), 0.6);
}

.banner-btn:hover::before {
    transform: translateX(100%);
}

.banner-btn:active {
    transform: translateY(-1px) scale(0.99);
}

/* 轮播指示点 */
.banner-dots {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.banner-dots button {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    border: none;
    background: rgba(255, 255, 255, 0.4);
    cursor: pointer;
    transition: var(--transition);
    padding: 0;
    position: relative;
}

.banner-dots button:hover {
    background: rgba(255, 255, 255, 0.75);
    transform: scale(1.2);
}

.banner-dots button.active {
    background: #fff;
    width: 28px;
    border-radius: var(--radius-sm);
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.5);
}

/* --------------------------------------------------------------------------
   8. 数字统计卡片
   -------------------------------------------------------------------------- */
.stats-section {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 48px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.4s ease;
}

.stat-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(var(--primary-rgb), 0.3);
}

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

.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary);
    line-height: 1.2;
    letter-spacing: -1px;
    font-variant-numeric: tabular-nums;
    transition: var(--transition);
}

[data-theme="dark"] .stat-number {
    color: var(--accent-light);
}

.stat-card:hover .stat-number {
    transform: scale(1.06);
    color: var(--accent);
}

.stat-label {
    font-size: 0.88rem;
    color: var(--text-light);
    margin-top: 8px;
    font-weight: 500;
}

/* --------------------------------------------------------------------------
   9. 通用区块与标题
   -------------------------------------------------------------------------- */
.section {
    margin-bottom: 64px;
}

.section-header {
    margin-bottom: 32px;
}

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
    position: relative;
    padding-left: 18px;
    line-height: 1.4;
}

.section-header h2::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 4px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    box-shadow: 0 0 12px rgba(var(--accent-rgb), 0.4);
}

.section-header p {
    color: var(--text-light);
    margin-top: 10px;
    font-size: 0.95rem;
    padding-left: 18px;
}

.section-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text);
}

.section-header h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 14px;
    margin-bottom: 6px;
    color: var(--text-light);
}

/* --------------------------------------------------------------------------
   10. 卡片网格
   -------------------------------------------------------------------------- */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

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

.card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 28px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.card::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: var(--radius);
    padding: 1px;
    background: linear-gradient(135deg, transparent 60%, rgba(var(--accent-rgb), 0.4) 100%);
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(var(--primary-rgb), 0.2);
}

.card:hover::after {
    opacity: 1;
}

.card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text);
    line-height: 1.5;
    transition: var(--transition);
}

.card:hover h3 {
    color: var(--primary);
}

.card p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.8;
}

.card p + p {
    margin-top: 12px;
}

.card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary);
    margin-top: 16px;
    margin-bottom: 6px;
}

[data-theme="dark"] .card h4 {
    color: var(--accent-light);
}

.card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 18px;
    color: #fff;
    box-shadow: 0 6px 16px rgba(var(--primary-rgb), 0.3);
    transition: var(--transition-bounce);
}

.card:hover .card-icon {
    transform: rotate(-6deg) scale(1.08);
    box-shadow: 0 8px 22px rgba(var(--accent-rgb), 0.4);
    background: var(--gradient-accent);
}

.card-icon svg {
    width: 26px;
    height: 26px;
}

/* --------------------------------------------------------------------------
   11. 文章列表
   -------------------------------------------------------------------------- */
.article-list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.article-item {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 26px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.article-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transform-origin: top;
    transition: transform 0.35s ease;
}

.article-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(var(--primary-rgb), 0.2);
}

.article-item:hover::before {
    transform: scaleY(1);
}

.article-item .meta {
    display: flex;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-lighter);
    margin-bottom: 10px;
    flex-wrap: wrap;
}

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

.article-item .meta span:first-child::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    margin-right: 2px;
}

.article-item h3 {
    font-size: 1.05rem;
    font-weight: 700;
    margin-bottom: 10px;
    line-height: 1.55;
}

.article-item h3 a {
    color: var(--text);
    transition: var(--transition-fast);
}

.article-item h3 a:hover {
    color: var(--primary);
}

.article-item p {
    font-size: 0.88rem;
    color: var(--text-light);
    margin-bottom: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    line-height: 1.75;
}

.read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-light);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

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

/* --------------------------------------------------------------------------
   12. FAQ 手风琴
   -------------------------------------------------------------------------- */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
    transition: var(--transition);
}

.faq-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.faq-item.active {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    padding: 18px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    gap: 12px;
    transition: var(--transition);
    line-height: 1.6;
}

.faq-question:hover {
    color: var(--primary);
    background: rgba(var(--primary-rgb), 0.03);
}

.faq-item.active .faq-question {
    color: var(--primary);
}

.faq-question .arrow {
    transition: transform 0.35s ease;
    flex-shrink: 0;
    color: var(--text-light);
    font-size: 0.75rem;
}

.faq-item.active .faq-question .arrow {
    transform: rotate(180deg);
    color: var(--accent);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    padding: 0 24px;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 0.92rem;
    color: var(--text-light);
    line-height: 1.85;
}

/* --------------------------------------------------------------------------
   13. HowTo 步骤
   -------------------------------------------------------------------------- */
.howto-steps {
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
}

.howto-step {
    display: flex;
    gap: 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
}

.howto-step:hover {
    transform: translateX(6px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(var(--accent-rgb), 0.35);
}

.step-num {
    flex-shrink: 0;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.35);
    transition: var(--transition-bounce);
}

.howto-step:hover .step-num {
    background: var(--gradient-accent);
    transform: scale(1.1) rotate(-8deg);
    box-shadow: 0 6px 18px rgba(var(--accent-rgb), 0.45);
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-content h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.howto-step:hover .step-content h4 {
    color: var(--primary);
}

.step-content p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.8;
}

/* --------------------------------------------------------------------------
   14. 客户评价
   -------------------------------------------------------------------------- */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.testimonial-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 26px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.testimonial-card::before {
    content: "\201C";
    position: absolute;
    top: -10px;
    right: 16px;
    font-size: 5rem;
    font-family: Georgia, serif;
    color: rgba(var(--primary-rgb), 0.08);
    line-height: 1;
    pointer-events: none;
    transition: var(--transition);
}

.testimonial-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(var(--accent-rgb), 0.3);
}

.testimonial-card:hover::before {
    color: rgba(var(--accent-rgb), 0.15);
    transform: scale(1.1);
}

.testimonial-card .stars {
    color: var(--accent);
    font-size: 0.95rem;
    margin-bottom: 12px;
    letter-spacing: 3px;
    text-shadow: 0 1px 4px rgba(var(--accent-rgb), 0.3);
}

.testimonial-card p {
    font-size: 0.9rem;
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 16px;
    font-style: italic;
    position: relative;
    z-index: 1;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.author-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    flex-shrink: 0;
    box-shadow: 0 3px 10px rgba(var(--primary-rgb), 0.3);
    transition: var(--transition-bounce);
}

.testimonial-card:hover .author-avatar {
    transform: scale(1.08);
    background: var(--gradient-accent);
}

.author-info {
    font-size: 0.82rem;
    line-height: 1.5;
}

.author-info strong {
    display: block;
    color: var(--text);
    font-weight: 700;
}

.author-info span {
    color: var(--text-lighter);
}

/* --------------------------------------------------------------------------
   15. 新闻中心
   -------------------------------------------------------------------------- */
.news-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.news-item {
    display: flex;
    gap: 18px;
    align-items: flex-start;
    padding: 18px 24px;
    background: var(--bg-card);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.news-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--gradient-accent);
    transform: scaleY(0);
    transform-origin: center;
    transition: transform 0.3s ease;
}

.news-item:hover {
    border-color: var(--primary-light);
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

.news-item:hover::before {
    transform: scaleY(1);
}

.news-date {
    flex-shrink: 0;
    font-size: 0.8rem;
    color: var(--text-lighter);
    font-weight: 600;
    min-width: 88px;
    font-variant-numeric: tabular-nums;
    padding-top: 2px;
}

.news-item h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    line-height: 1.6;
    transition: var(--transition-fast);
}

.news-item h4 a {
    color: var(--text);
    transition: var(--transition-fast);
}

.news-item h4 a:hover {
    color: var(--primary);
}

.news-item:hover h4 {
    color: var(--primary);
}

/* --------------------------------------------------------------------------
   16. 联系我们
   -------------------------------------------------------------------------- */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.contact-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 30px 24px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 60%;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
    transition: transform 0.4s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(var(--primary-rgb), 0.25);
}

.contact-card:hover::before {
    transform: translateX(-50%) scaleX(1);
}

.contact-card svg {
    width: 38px;
    height: 38px;
    margin: 0 auto 14px;
    color: var(--primary);
    transition: var(--transition-bounce);
}

.contact-card:hover svg {
    color: var(--accent);
    transform: scale(1.12) translateY(-2px);
}

.contact-card h4 {
    font-size: 0.95rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.contact-card p {
    font-size: 0.88rem;
    color: var(--text-light);
    word-break: break-all;
    line-height: 1.7;
}

/* --------------------------------------------------------------------------
   17. 页脚
   -------------------------------------------------------------------------- */
.footer {
    background: var(--gradient-primary);
    color: #cbd5e1;
    padding: 64px 0 28px;
    margin-top: 48px;
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(var(--accent-rgb), 0.5), transparent);
}

.footer::after {
    content: "";
    position: absolute;
    bottom: -50%;
    right: -10%;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle, rgba(var(--accent-rgb), 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
    position: relative;
    z-index: 1;
}

.footer h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 18px;
    position: relative;
    padding-bottom: 10px;
}

.footer h4::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 24px;
    height: 2px;
    background: var(--accent);
    border-radius: var(--radius-full);
}

.footer p {
    font-size: 0.85rem;
    line-height: 1.85;
    color: #94a3b8;
}

.footer ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer ul li a {
    font-size: 0.85rem;
    color: #94a3b8;
    transition: var(--transition);
    display: inline-block;
    position: relative;
}

.footer ul li a::before {
    content: "→";
    position: absolute;
    left: -16px;
    opacity: 0;
    transition: var(--transition);
    color: var(--accent);
}

.footer ul li a:hover {
    color: #fff;
    transform: translateX(16px);
}

.footer ul li a:hover::before {
    opacity: 1;
    left: -18px;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 0.8rem;
    color: #64748b;
    position: relative;
    z-index: 1;
}

.footer-bottom a {
    color: #94a3b8;
    transition: var(--transition-fast);
}

.footer-bottom a:hover {
    color: #fff;
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* --------------------------------------------------------------------------
   18. 返回顶部按钮
   -------------------------------------------------------------------------- */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 6px 20px rgba(var(--primary-rgb), 0.45);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px) scale(0.9);
    transition: var(--transition-bounce);
    z-index: 900;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.back-to-top:hover {
    background: var(--gradient-accent);
    transform: translateY(-4px) scale(1.08);
    box-shadow: 0 10px 28px rgba(var(--accent-rgb), 0.55);
}

.back-to-top:active {
    transform: translateY(-2px) scale(1.02);
}

/* --------------------------------------------------------------------------
   19. 滚动动画
   -------------------------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
        transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    will-change: opacity, transform;
}

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

/* 无脚本回退 */
.no-js .reveal {
    opacity: 1;
    transform: none;
}

.no-js .faq-answer {
    max-height: none;
    padding: 0 24px 20px;
}

/* --------------------------------------------------------------------------
   20. 响应式布局 - 平板 (1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .nav-links {
        gap: 2px;
    }

    .nav-links a {
        padding: 7px 10px;
        font-size: 0.85rem;
    }

    .search-box input {
        width: 100px;
    }

    .search-box input:focus {
        width: 120px;
    }

    .grid-3,
    .testimonial-grid,
    .contact-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }

    .stats-section {
        grid-template-columns: repeat(2, 1fr);
    }

    .banner-content h1 {
        font-size: 2rem;
    }

    .banner-content h2 {
        font-size: 1.85rem;
    }
}

/* --------------------------------------------------------------------------
   21. 响应式布局 - 手机 (768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .search-box {
        display: none;
    }

    .logo {
        font-size: 1.15rem;
    }

    .logo svg {
        width: 32px;
        height: 32px;
    }

    .banner {
        min-height: 300px;
        border-radius: var(--radius);
        margin-bottom: 32px;
    }

    .banner-slide {
        padding: 36px 28px;
    }

    .banner-content h1 {
        font-size: 1.6rem;
    }

    .banner-content h2 {
        font-size: 1.5rem;
    }

    .banner-content p {
        font-size: 0.92rem;
        margin-bottom: 20px;
    }

    .banner-btn {
        padding: 11px 26px;
        font-size: 0.92rem;
    }

    .grid-3,
    .grid-2,
    .testimonial-grid,
    .contact-grid,
    .article-list {
        grid-template-columns: 1fr;
    }

    .stats-section {
        grid-template-columns: repeat(2, 1fr);
        gap: 14px;
    }

    .stat-card {
        padding: 22px 14px;
    }

    .stat-number {
        font-size: 1.75rem;
    }

    .stat-label {
        font-size: 0.8rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer {
        padding: 48px 0 24px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .section {
        margin-bottom: 48px;
    }

    .section-header {
        margin-bottom: 24px;
    }

    .section-header h2 {
        font-size: 1.4rem;
    }

    .section-header p {
        font-size: 0.88rem;
    }

    .howto-step {
        flex-direction: column;
        gap: 14px;
        padding: 20px;
    }

    .howto-step:hover {
        transform: translateX(0) translateY(-3px);
    }

    .step-num {
        width: 40px;
        height: 40px;
        font-size: 1rem;
    }

    .news-item {
        flex-direction: column;
        gap: 6px;
        padding: 16px 20px;
    }

    .news-date {
        min-width: auto;
    }

    .card {
        padding: 22px;
    }

    .article-item {
        padding: 22px;
    }

    .faq-question {
        padding: 16px 20px;
        font-size: 0.95rem;
    }

    .faq-answer {
        padding: 0 20px;
    }

    .faq-item.active .faq-answer {
        padding: 0 20px 18px;
    }

    .testimonial-card {
        padding: 22px;
    }

    .contact-card {
        padding: 24px 20px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }

    .breadcrumb {
        font-size: 0.8rem;
        padding: 12px 0;
    }

    .container {
        padding: 0 16px;
    }
}

/* --------------------------------------------------------------------------
   22. 响应式布局 - 小屏手机 (480px)
   -------------------------------------------------------------------------- */
@media (max-width: 480px) {
    .stats-section {
        grid-template-columns: 1fr;
    }

    .banner-content h1 {
        font-size: 1.35rem;
    }

    .banner-content h2 {
        font-size: 1.3rem;
    }

    .banner-content p {
        font-size: 0.88rem;
    }

    .banner-slide {
        padding: 28px 20px;
    }

    .banner {
        min-height: 280px;
    }

    .banner-dots {
        bottom: 16px;
    }

    .logo span {
        display: none;
    }

    .logo {
        gap: 0;
    }

    .section-header h2 {
        font-size: 1.25rem;
        padding-left: 14px;
    }

    .section-header h2::before {
        width: 3px;
        top: 6px;
        bottom: 6px;
    }

    .section-header p {
        padding-left: 14px;
        font-size: 0.85rem;
    }

    .card h3 {
        font-size: 1.02rem;
    }

    .card p {
        font-size: 0.88rem;
    }

    .stat-number {
        font-size: 1.6rem;
    }

    .footer h4 {
        font-size: 0.9rem;
    }

    .footer p,
    .footer ul li a {
        font-size: 0.82rem;
    }
}

/* --------------------------------------------------------------------------
   23. 无障碍与减少动画偏好
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --border: #000;
        --text-light: #333;
    }

    .card,
    .article-item,
    .faq-item {
        border-width: 2px;
    }
}

/* 打印样式 */
@media print {
    .navbar,
    .mobile-menu,
    .back-to-top,
    .banner-dots,
    .theme-toggle,
    .menu-toggle,
    .search-box {
        display: none !important;
    }

    body {
        background: #fff;
        color: #000;
    }

    .banner {
        background: #eee !important;
        color: #000;
        min-height: auto;
    }

    .banner-content h1,
    .banner-content h2 {
        -webkit-text-fill-color: #000;
        color: #000;
    }

    .card,
    .article-item {
        box-shadow: none;
        border: 1px solid #ccc;
        break-inside: avoid;
    }

    .section {
        margin-bottom: 24px;
    }
}
```