```css
/* ===== 设计令牌 & 颜色系统 (高对比度优先) ===== */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-card: #ffffff;
    --bg-footer: #17202a;
    --text-primary: #1f2937;
    --text-secondary: #243447;
    --text-heading: #111827;
    --text-link: #0f4c81;
    --text-link-hover: #0a3a62;
    --text-on-dark: #f1f5f9;
    --text-footer: #e2e8f0;
    --border-light: #d1d5db;
    --accent: #0f4c81;
    --accent-dark: #0a3a62;
    --button-bg: #0f4c81;
    --button-text: #ffffff;
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --nav-bg: rgba(255,255,255,0.95);
    --nav-text: #1f2937;
    --card-border: #e5e7eb;
    --input-bg: #ffffff;
    --input-text: #1f2937;
    --gradient-banner: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f4c81 100%);
    --gradient-card: linear-gradient(145deg, #ffffff 0%, #f1f5f9 100%);
    --glass-bg: rgba(255,255,255,0.7);
    --glass-border: rgba(255,255,255,0.3);
    --hover-translate: translateY(-6px);
    --hover-shadow: 0 12px 24px rgba(0,0,0,0.12);
}

[data-theme="dark"] {
    --bg-primary: #0b1120;
    --bg-secondary: #111a2c;
    --bg-card: #0f172a;
    --bg-footer: #020617;
    --text-primary: #e2e8f0;
    --text-secondary: #cbd5e1;
    --text-heading: #f8fafc;
    --text-link: #93c5fd;
    --text-link-hover: #bfdbfe;
    --text-on-dark: #f1f5f9;
    --text-footer: #e2e8f0;
    --border-light: #334155;
    --accent: #60a5fa;
    --accent-dark: #3b82f6;
    --button-bg: #3b82f6;
    --button-text: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.5);
    --nav-bg: rgba(2, 6, 23, 0.9);
    --nav-text: #f1f5f9;
    --card-border: #1e293b;
    --input-bg: #1e293b;
    --input-text: #e2e8f0;
    --gradient-banner: linear-gradient(135deg, #020617 0%, #0f172a 50%, #1e3a5f 100%);
    --gradient-card: linear-gradient(145deg, #0f172a 0%, #1e293b 100%);
    --glass-bg: rgba(15, 23, 42, 0.7);
    --glass-border: rgba(148, 163, 184, 0.2);
    --hover-shadow: 0 12px 24px rgba(0,0,0,0.4);
}

/* ===== 基础样式 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    color: var(--text-heading);
    font-weight: 650;
    line-height: 1.3;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    margin-bottom: 0.5rem;
}

h2 {
    font-size: clamp(1.5rem, 3vw, 1.9rem);
    margin: 2.5rem 0 1rem;
    border-left: 6px solid var(--accent);
    padding-left: 0.8rem;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -8px;
    width: 60px;
    height: 3px;
    background: var(--gradient-banner);
    border-radius: 2px;
}

h3 {
    font-size: 1.4rem;
    margin: 1.8rem 0 0.8rem;
}

h4 {
    font-size: 1.2rem;
    margin: 1.2rem 0 0.5rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

a {
    color: var(--text-link);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease, opacity 0.2s ease;
}

a:hover {
    color: var(--text-link-hover);
    text-decoration: underline;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* ===== 导航栏 ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--nav-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--border-light);
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar.scrolled {
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
    gap: 20px;
}

.logo {
    font-size: 1.7rem;
    font-weight: 700;
    color: var(--text-heading);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    transition: transform 0.3s ease;
}

.logo:hover {
    transform: scale(1.02);
    text-decoration: none;
}

.logo svg {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(15, 76, 129, 0.3);
    transition: transform 0.3s ease;
}

.logo:hover svg {
    transform: rotate(-5deg) scale(1.05);
}

.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}

.nav-links a {
    color: var(--nav-text);
    font-weight: 500;
    position: relative;
    padding: 4px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: var(--accent);
    text-decoration: none;
}

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

.nav-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--input-bg);
    border: 1px solid var(--border-light);
    border-radius: 40px;
    padding: 4px 4px 4px 16px;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(15, 76, 129, 0.1);
}

.search-box input {
    border: none;
    background: transparent;
    padding: 8px;
    color: var(--input-text);
    outline: none;
    width: 160px;
    font-size: 0.95rem;
}

.search-box input::placeholder {
    color: var(--text-secondary);
    opacity: 0.8;
}

.search-box button {
    background: var(--button-bg);
    color: var(--button-text);
    border: none;
    border-radius: 30px;
    padding: 8px 18px;
    cursor: pointer;
    font-weight: 500;
    transition: background 0.3s ease, transform 0.2s ease;
    white-space: nowrap;
}

.search-box button:hover {
    background: var(--accent-dark);
    transform: scale(1.02);
}

.theme-toggle, .menu-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    border-radius: 50%;
    color: var(--text-primary);
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease, transform 0.2s ease;
}

.theme-toggle:hover, .menu-toggle:hover {
    background: var(--bg-secondary);
    transform: scale(1.1);
}

.menu-toggle {
    display: none;
}

/* 移动端菜单 */
.mobile-menu {
    display: none;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border-light);
    padding: 12px 24px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}

.mobile-menu.open {
    max-height: 500px;
    padding: 12px 24px;
}

.mobile-menu a {
    display: block;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    font-weight: 500;
    transition: padding-left 0.3s ease, color 0.3s ease;
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    padding-left: 12px;
    color: var(--accent);
    text-decoration: none;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    background: var(--button-bg);
    color: var(--button-text);
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(15, 76, 129, 0.2);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

.btn:hover {
    background: var(--accent-dark);
    color: #fff;
    transform: var(--hover-translate);
    box-shadow: var(--hover-shadow);
    text-decoration: none;
}

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

.btn:active {
    transform: translateY(-2px) scale(0.98);
}

/* ===== Banner ===== */
.banner {
    background: var(--gradient-banner);
    color: var(--text-on-dark);
    padding: 80px 0;
    border-radius: 0 0 48px 48px;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    animation: float 8s ease-in-out infinite;
}

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

.banner-content {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.banner-text {
    flex: 2;
    color: var(--text-on-dark);
    min-width: 300px;
}

.banner-text h1 {
    color: #ffffff;
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
    text-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.banner-text p {
    color: rgba(255,255,255,0.9);
    font-size: 1.15rem;
    margin-bottom: 1.5rem;
    max-width: 600px;
}

.banner-visual {
    flex: 1;
    min-width: 280px;
    position: relative;
}

.banner-visual svg {
    border-radius: 24px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
    transition: transform 0.5s ease;
}

.banner-visual:hover svg {
    transform: translateY(-10px) scale(1.02);
}

/* ===== 卡片网格 ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
    margin: 40px 0;
}

.card {
    background: var(--gradient-card);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 28px;
    box-shadow: var(--shadow);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-banner);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: var(--hover-translate);
    box-shadow: var(--hover-shadow);
    border-color: var(--accent);
}

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

.card h3 {
    margin-top: 0;
    position: relative;
}

.card p {
    color: var(--text-secondary);
    position: relative;
}

.card a {
    color: var(--accent);
    position: relative;
}

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

.article-item {
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: 16px;
    border-left: 4px solid var(--accent);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.article-item::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.article-item:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow);
    background: var(--bg-card);
}

.article-item:hover::after {
    transform: translateX(100%);
}

.article-item h4 {
    margin-bottom: 6px;
    transition: color 0.3s ease;
}

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

.article-meta {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

/* ===== FAQ ===== */
.faq-item {
    margin-bottom: 16px;
    border: 1px solid var(--border-light);
    border-radius: 16px;
    background: var(--bg-card);
    overflow: hidden;
    transition: all 0.3s ease;
}

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

.faq-question {
    padding: 20px 24px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-heading);
    transition: background 0.3s ease;
    user-select: none;
}

.faq-question:hover {
    background: var(--bg-secondary);
}

.faq-question span {
    font-size: 1.5rem;
    transition: transform 0.3s ease;
    color: var(--accent);
    font-weight: 300;
}

.faq-item.open .faq-question span {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 24px 20px;
    color: var(--text-primary);
    display: none;
    animation: fadeInDown 0.3s ease;
}

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

.faq-item.open .faq-answer {
    display: block;
}

/* ===== 表格 ===== */
.table-wrap {
    overflow-x: auto;
    border-radius: 16px;
    box-shadow: var(--shadow);
}

table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 20px 0;
    background: var(--bg-card);
    border-radius: 16px;
    overflow: hidden;
}

th {
    background: var(--bg-secondary);
    color: var(--text-heading);
    padding: 14px;
    text-align: left;
    border-bottom: 2px solid var(--accent);
    font-weight: 600;
}

td {
    padding: 14px;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    transition: background 0.3s ease;
}

tr:hover td {
    background: var(--bg-secondary);
}

tr:last-child td {
    border-bottom: none;
}

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

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-banner);
}

.footer a {
    color: var(--text-footer);
    transition: color 0.3s ease, padding-left 0.3s ease;
}

.footer a:hover {
    color: #ffffff;
    padding-left: 4px;
    text-decoration: none;
}

.footer .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
}

.footer h3, .footer h4 {
    color: #ffffff;
}

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

/* ===== 面包屑 ===== */
.breadcrumb {
    padding: 16px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

.breadcrumb a:hover {
    text-decoration: underline;
}

/* ===== 滚动动画 ===== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ===== 返回顶部 ===== */
#backTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--button-bg);
    color: white;
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
    font-size: 1.5rem;
    box-shadow: var(--shadow);
    z-index: 999;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

#backTop.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#backTop:hover {
    background: var(--accent-dark);
    transform: translateY(-4px);
    box-shadow: var(--hover-shadow);
}

/* ===== 数字动画 ===== */
.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    display: inline-block;
}

/* ===== 图片 ===== */
img, svg {
    max-width: 100%;
    height: auto;
}

/* ===== 引用块 ===== */
blockquote {
    border-left: 6px solid var(--accent);
    padding: 16px 24px;
    background: var(--bg-secondary);
    border-radius: 8px;
    margin: 20px 0;
    font-style: italic;
    position: relative;
    transition: all 0.3s ease;
}

blockquote:hover {
    box-shadow: var(--shadow);
    transform: translateX(4px);
}

/* ===== 有序列表 ===== */
ol {
    margin-left: 20px;
    color: var(--text-primary);
}

ol li {
    margin-bottom: 8px;
    padding-left: 8px;
    position: relative;
}

ol li::marker {
    color: var(--accent);
    font-weight: 600;
}

/* ===== 工具类 ===== */
.text-muted {
    color: var(--text-secondary);
}

.section-sub {
    color: var(--text-secondary);
}

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
    .container {
        padding: 0 20px;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
    }

    .menu-toggle {
        display: flex;
    }

    .mobile-menu.open {
        display: block;
    }

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

    .banner {
        padding: 60px 0;
    }

    .banner-content {
        gap: 40px;
    }

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

    .card-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 16px;
    }
}

@media (max-width: 600px) {
    .nav-inner {
        height: 60px;
    }

    .logo {
        font-size: 1.4rem;
    }

    .logo svg {
        width: 30px;
        height: 30px;
    }

    .search-box {
        display: none;
    }

    .banner {
        padding: 40px 0;
        border-radius: 0 0 32px 32px;
    }

    .banner-content {
        gap: 30px;
        text-align: center;
    }

    .banner-text p {
        font-size: 1rem;
    }

    .banner-visual {
        min-width: 200px;
    }

    .banner-visual svg {
        width: 100%;
        height: auto;
    }

    h2 {
        font-size: 1.5rem;
        margin: 2rem 0 0.8rem;
    }

    .card-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin: 24px 0;
    }

    .card {
        padding: 20px;
    }

    .article-item {
        padding: 16px;
    }

    #backTop {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
        font-size: 1.2rem;
    }

    .footer {
        padding: 40px 0 20px;
    }

    .footer .grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .container {
        padding: 0 16px;
    }
}

@media (max-width: 400px) {
    .footer .grid {
        grid-template-columns: 1fr;
    }

    .theme-toggle {
        font-size: 1.2rem;
    }

    .menu-toggle {
        font-size: 1.2rem;
    }
}

/* ===== 暗色模式微调 ===== */
[data-theme="dark"] .banner {
    background: var(--gradient-banner);
}

[data-theme="dark"] .banner-text p {
    color: rgba(226, 232, 240, 0.9);
}

[data-theme="dark"] .nav-links a {
    color: #e2e8f0;
}

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

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

[data-theme="dark"] .faq-question:hover {
    background: var(--bg-secondary);
}

[data-theme="dark"] blockquote {
    background: var(--bg-secondary);
}

[data-theme="dark"] .search-box input::placeholder {
    color: #94a3b8;
}

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

/* ===== 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: 5px;
}

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

/* ===== 选中样式 ===== */
::selection {
    background: var(--accent);
    color: #ffffff;
}

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

/* ===== 链接悬停效果 ===== */
a[href^="#"]:hover {
    text-decoration: none;
}

/* ===== 卡片网格内的链接 ===== */
.card-grid a, .article-list a {
    display: inline-block;
    transition: all 0.3s ease;
}

.card-grid a:hover, .article-list a:hover {
    padding-left: 4px;
    text-decoration: none;
}

/* ===== 表格响应式 ===== */
.table-wrap {
    margin: 20px -16px;
    padding: 0 16px;
}

@media (max-width: 600px) {
    .table-wrap {
        margin: 20px -16px;
        padding: 0 16px;
    }

    table {
        min-width: 500px;
    }
}

/* ===== 品牌介绍区块 ===== */
#brand .card p {
    font-size: 0.95rem;
}

/* ===== 产品服务区块 ===== */
#products .card {
    text-align: center;
}

#products .card:hover {
    transform: var(--hover-translate);
}

/* ===== 解决方案区块 ===== */
#solution {
    position: relative;
}

/* ===== 客户评价区块 ===== */
#cases blockquote {
    font-size: 1.1rem;
    line-height: 1.8;
}

/* ===== 新闻中心区块 ===== */
#articles .article-item {
    cursor: pointer;
}

/* ===== FAQ区块 ===== */
#faq .faq-item {
    transition: all 0.3s ease;
}

/* ===== HowTo区块 ===== */
#howto ol {
    counter-reset: step;
}

#howto ol li {
    counter-increment: step;
    position: relative;
    padding-left: 40px;
}

#howto ol li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
}

/* ===== 联系区块 ===== */
#contact .card {
    text-align: center;
}

#contact .card h3 {
    margin-bottom: 12px;
}

#contact .card p {
    font-size: 0.95rem;
}

/* ===== 友情链接区块 ===== */
.friend-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin: 16px 0;
}

.friend-links a {
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-radius: 20px;
    transition: all 0.3s ease;
}

.friend-links a:hover {
    background: var(--accent);
    color: #fff;
    text-decoration: none;
    transform: translateY(-2px);
}

/* ===== 版权区块 ===== */
.copyright {
    border-top: 1px solid var(--border-light);
    margin: 40px 0 0;
    padding: 20px 0;
    text-align: center;
}

.copyright p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== 暗色模式下的版权区 ===== */
[data-theme="dark"] .copyright {
    border-top-color: var(--border-light);
}

/* ===== 打印样式 ===== */
@media print {
    .navbar, .footer, #backTop, .theme-toggle, .menu-toggle, .search-box {
        display: none !important;
    }

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

    .banner {
        background: #f0f0f0;
        color: #000;
        border-radius: 0;
        padding: 20px 0;
    }

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

    a {
        color: #000;
        text-decoration: underline;
    }
}

/* ===== 无障碍阅读 ===== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ===== 动画增强 ===== */
@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

/* ===== 玻璃拟态效果 ===== */
.glass-effect {
    background: var(--glass-bg);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border: 1px solid var(--glass-border);
}

/* ===== 渐变文本 ===== */
.gradient-text {
    background: var(--gradient-banner);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}

/* ===== 卡片悬浮时内容上移 ===== */
.card:hover h3 {
    transform: translateY(-2px);
    transition: transform 0.3s ease;
}

.card:hover p {
    transform: translateY(-1px);
    transition: transform 0.3s ease;
}

/* ===== 统一过渡 ===== */
* {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
}

/* ===== 暗色模式下图片亮度 ===== */
[data-theme="dark"] img {
    filter: brightness(0.9) contrast(1.1);
}

/* ===== 性能优化：减少重绘 ===== */
.banner, .card, .article-item, .faq-item {
    will-change: transform;
}
```