```css
/* ===== 吾色交友网 - 完整样式表 ===== */
/* 设计理念：专业、温暖、可信赖的恋爱交友平台 */

/* ===== CSS变量与主题 ===== */
:root {
    /* 主色调 - 专业深蓝+活力橙 */
    --primary: #1F4E79;
    --primary-light: #2E75B6;
    --primary-dark: #163A5F;
    --accent: #FF6B35;
    --accent-light: #FF8C5A;
    --accent-glow: rgba(255, 107, 53, 0.25);
    
    /* 功能色 */
    --success: #10B981;
    --warning: #F59E0B;
    --danger: #EF4444;
    
    /* 背景与卡片 */
    --bg-main: #F0F4F8;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F8FAFC;
    --bg-section-alt: #E8EDF2;
    
    /* 文字颜色 - 高对比度 */
    --text-heading: #0F172A;
    --text-body: #1E293B;
    --text-muted: #475569;
    --text-light: #64748B;
    --text-white: #FFFFFF;
    --text-link: #1D4ED8;
    
    /* 边框与阴影 */
    --border-light: #E2E8F0;
    --border-medium: #CBD5E1;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 20px var(--accent-glow);
    
    /* 导航 */
    --nav-bg: rgba(255, 255, 255, 0.92);
    --nav-border: rgba(226, 232, 240, 0.8);
    
    /* 暗色模式变量 */
    --dark-bg: #0F172A;
    --dark-bg-alt: #1E293B;
    --dark-card: #1E293B;
    --dark-card-hover: #263445;
    --dark-border: #334155;
    --dark-text: #E2E8F0;
    --dark-text-muted: #94A3B8;
    --dark-heading: #F8FAFC;
    --dark-nav-bg: rgba(15, 23, 42, 0.95);
    
    /* 布局 */
    --container-max: 1280px;
    --section-padding: 64px 0;
    --card-radius: 20px;
    --btn-radius: 50px;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.35s ease;
    --transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #1F4E79 0%, #2E75B6 50%, #3B82F6 100%);
    --gradient-accent: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
    --gradient-banner: linear-gradient(120deg, #0F172A 0%, #1F4E79 40%, #2E75B6 80%, #3B82F6 100%);
    --gradient-card: linear-gradient(145deg, #FFFFFF 0%, #F8FAFC 100%);
    --gradient-dark-card: linear-gradient(145deg, #1E293B 0%, #263445 100%);
}

/* ===== 暗色模式覆盖 ===== */
body.dark-mode {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

body.dark-mode .navbar {
    background: var(--dark-nav-bg);
    border-bottom-color: var(--dark-border);
}

body.dark-mode .logo a {
    color: #60A5FA;
}

body.dark-mode .nav-links a {
    color: var(--dark-text);
}

body.dark-mode .nav-links a:hover {
    color: #60A5FA;
    border-bottom-color: #60A5FA;
}

body.dark-mode .search-box {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--dark-border);
}

body.dark-mode .search-box input {
    color: var(--dark-text);
}

body.dark-mode .search-box input::placeholder {
    color: var(--dark-text-muted);
}

body.dark-mode .card,
body.dark-mode .article-card,
body.dark-mode .faq-item,
body.dark-mode .howto-box,
body.dark-mode .case-item {
    background: var(--dark-card);
    color: var(--dark-text);
    border-color: var(--dark-border);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

body.dark-mode .card:hover {
    background: var(--dark-card-hover);
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4 {
    color: var(--dark-heading);
}

body.dark-mode p {
    color: var(--dark-text);
}

body.dark-mode .text-muted,
body.dark-mode .meta {
    color: var(--dark-text-muted);
}

body.dark-mode .btn-outline {
    border-color: #60A5FA;
    color: #60A5FA;
}

body.dark-mode .btn-outline:hover {
    background: rgba(96, 165, 250, 0.1);
}

body.dark-mode section[style*="background: #F1F5F9"],
body.dark-mode section[style*="background: #f1f5f9"] {
    background: var(--dark-bg-alt) !important;
}

body.dark-mode .table-wrap table {
    background: var(--dark-card);
}

body.dark-mode th {
    background: var(--primary-dark);
    color: var(--dark-heading);
}

body.dark-mode td {
    border-color: var(--dark-border);
    color: var(--dark-text);
}

body.dark-mode footer {
    background: #0B1220;
}

body.dark-mode .menu-toggle {
    color: var(--dark-text);
}

body.dark-mode .dark-toggle {
    background: var(--primary-light);
}

body.dark-mode .dark-toggle:hover {
    background: #3B82F6;
}

body.dark-mode .faq-question {
    color: var(--dark-heading);
}

body.dark-mode .faq-question span {
    color: #60A5FA;
}

body.dark-mode .faq-answer {
    color: var(--dark-text);
}

body.dark-mode .banner {
    background: var(--gradient-banner);
}

body.dark-mode .banner h1 {
    color: var(--dark-heading);
}

body.dark-mode .banner p {
    color: #CBD5E1;
}

body.dark-mode .btn-light {
    background: var(--dark-text);
    color: var(--dark-bg);
}

body.dark-mode .btn-light:hover {
    background: #CBD5E1;
}

body.dark-mode #backTop {
    background: var(--primary-light);
}

body.dark-mode #backTop:hover {
    background: #3B82F6;
}

body.dark-mode .gradient-text {
    background: linear-gradient(135deg, #60A5FA, #93C5FD);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-main);
    background-image: 
        radial-gradient(circle at 15% 20%, rgba(46, 117, 182, 0.06) 0%, transparent 40%),
        radial-gradient(circle at 85% 70%, rgba(255, 107, 53, 0.05) 0%, transparent 45%);
    color: var(--text-body);
    line-height: 1.7;
    font-size: 16px;
    font-weight: 400;
    letter-spacing: 0.01em;
    transition: background-color var(--transition-normal), color var(--transition-normal);
    overflow-x: hidden;
}

/* ===== 容器 ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* ===== 排版 ===== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--text-heading);
    transition: color var(--transition-normal);
}

h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.02em;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #FFFFFF 0%, #E2E8F0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.2);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    border-left: 6px solid var(--accent);
    padding-left: 18px;
    margin-bottom: 32px;
    position: relative;
}

h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 18px;
    width: 60px;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 3px;
}

h3 {
    font-size: 1.35rem;
    margin: 28px 0 16px;
    font-weight: 600;
}

h4 {
    font-size: 1.1rem;
    margin: 20px 0 12px;
    font-weight: 600;
}

p {
    margin-bottom: 16px;
    color: var(--text-body);
    transition: color var(--transition-normal);
}

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

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

strong {
    font-weight: 700;
    color: var(--text-heading);
}

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

/* ===== 网格布局 ===== */
.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 28px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ===== 卡片组件 ===== */
.card, .article-card, .faq-item, .case-item, .howto-box {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--card-radius);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-normal), border-color var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-medium);
}

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

.article-card {
    display: flex;
    flex-direction: column;
}

.article-card h4 {
    font-size: 1.2rem;
    margin-bottom: 10px;
    transition: color var(--transition-fast);
}

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

.article-card .meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.article-card p {
    flex-grow: 1;
    font-size: 0.95rem;
    color: var(--text-muted);
}

.article-card a {
    margin-top: 16px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.article-card a::after {
    content: '→';
    transition: transform var(--transition-fast);
}

.article-card a:hover::after {
    transform: translateX(4px);
}

/* ===== 按钮 ===== */
.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: 14px 32px;
    border-radius: var(--btn-radius);
    border: none;
    font-weight: 600;
    display: inline-block;
    cursor: pointer;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(31, 78, 121, 0.3);
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-primary::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.5s, height 0.5s;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(31, 78, 121, 0.4);
}

.btn-primary:hover::after {
    width: 300px;
    height: 300px;
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    padding: 12px 30px;
    border-radius: var(--btn-radius);
    font-weight: 600;
    display: inline-block;
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.btn-outline::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary);
    transition: left var(--transition-fast);
    z-index: -1;
}

.btn-outline:hover {
    color: var(--text-white);
}

.btn-outline:hover::before {
    left: 0;
}

.btn-light {
    background: var(--text-white);
    color: var(--primary);
    padding: 14px 36px;
    border-radius: var(--btn-radius);
    font-weight: 700;
    border: none;
    cursor: pointer;
    font-size: 1.05rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
    transition: all var(--transition-fast);
}

.btn-light:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
    background: #F0F4F8;
}

/* ===== 导航栏 ===== */
.navbar {
    background: var(--nav-bg);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    padding: 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--nav-border);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    transition: background-color var(--transition-normal), box-shadow var(--transition-fast);
}

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

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    min-height: 70px;
}

.logo a {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: color var(--transition-fast);
}

.logo a::before {
    content: '💙';
    font-size: 1.4rem;
}

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

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links li {
    position: relative;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-heading);
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 3px solid transparent;
    transition: all var(--transition-fast);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -3px;
    left: 0;
    width: 0;
    height: 3px;
    background: var(--gradient-accent);
    border-radius: 3px;
    transition: width var(--transition-fast);
}

.nav-links a:hover {
    color: var(--primary);
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg-card);
    border-radius: 50px;
    padding: 4px 12px;
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.search-box:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(31, 78, 121, 0.15);
}

.search-box input {
    border: none;
    outline: none;
    padding: 8px 10px;
    font-size: 0.9rem;
    width: 180px;
    background: transparent;
    color: var(--text-body);
    transition: width var(--transition-fast);
}

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

.search-box button {
    background: transparent;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    color: var(--primary);
    padding: 4px;
    transition: transform var(--transition-fast);
}

.search-box button:hover {
    transform: scale(1.2);
}

.dark-toggle {
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    padding: 10px 20px;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all var(--transition-fast);
    box-shadow: 0 2px 8px rgba(31, 78, 121, 0.2);
}

.dark-toggle:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(31, 78, 121, 0.3);
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--primary);
    cursor: pointer;
    padding: 4px 8px;
    transition: transform var(--transition-fast);
}

.menu-toggle:hover {
    transform: scale(1.1);
}

/* ===== Banner 主视觉 ===== */
.banner {
    background: var(--gradient-banner);
    color: var(--text-white);
    padding: 80px 0 90px;
    position: relative;
    overflow: hidden;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 60%);
    animation: float 8s ease-in-out infinite;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 60%;
    height: 150%;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
    animation: float 12s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translateY(0) scale(1); }
    50% { transform: translateY(-20px) scale(1.05); }
}

.banner-content {
    max-width: 750px;
    position: relative;
    z-index: 1;
}

.banner h1 {
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    margin-bottom: 16px;
    line-height: 1.2;
    background: linear-gradient(135deg, #FFFFFF 0%, #E2E8F0 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
}

.banner p {
    font-size: 1.15rem;
    color: #E2E8F0;
    margin-bottom: 28px;
    line-height: 1.8;
    max-width: 600px;
}

.banner .btn-light {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(255, 255, 255, 0.4); }
    50% { box-shadow: 0 0 0 15px rgba(255, 255, 255, 0); }
}

/* ===== 区块通用 ===== */
section {
    padding: var(--section-padding);
    position: relative;
}

section:nth-child(even) {
    background: var(--bg-section-alt);
}

/* ===== 表格 ===== */
.table-wrap {
    overflow-x: auto;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    border-radius: 12px;
    overflow: hidden;
    transition: background-color var(--transition-normal);
}

th, td {
    padding: 16px 20px;
    border: 1px solid var(--border-light);
    text-align: left;
    transition: border-color var(--transition-normal);
}

th {
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 600;
    letter-spacing: 0.02em;
}

tr:nth-child(even) {
    background: rgba(0, 0, 0, 0.02);
}

tr:hover {
    background: rgba(46, 117, 182, 0.05);
}

/* ===== FAQ 样式 ===== */
.faq-item {
    margin-bottom: 16px;
    padding: 20px 28px;
    cursor: pointer;
    transition: all var(--transition-fast);
    border-left: 4px solid transparent;
}

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

.faq-question {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text-heading);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    transition: color var(--transition-fast);
}

.faq-question span {
    font-size: 1.5rem;
    color: var(--accent);
    transition: transform var(--transition-fast);
    flex-shrink: 0;
}

.faq-item:hover .faq-question span {
    transform: rotate(90deg);
}

.faq-answer {
    margin-top: 14px;
    color: var(--text-body);
    line-height: 1.7;
    padding-top: 14px;
    border-top: 1px solid var(--border-light);
    transition: border-color var(--transition-normal);
}

/* ===== 底部 ===== */
footer {
    background: var(--footer-bg, #243447);
    color: var(--footer-text, #E2E8F0);
    padding: 56px 0 24px;
    margin-top: 60px;
    position: relative;
}

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

footer a {
    color: #B0C4DE;
    transition: color var(--transition-fast);
}

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

footer h4 {
    color: var(--text-white);
    font-size: 1.1rem;
    margin-bottom: 16px;
    font-weight: 600;
}

footer p {
    color: #B0C4DE;
    font-size: 0.95rem;
    margin-bottom: 8px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-bottom: 32px;
}

.copyright {
    text-align: center;
    margin-top: 40px;
    border-top: 1px solid #3B4C5E;
    padding-top: 24px;
}

.copyright p {
    font-size: 0.9rem;
    color: #8CA3C3;
    margin-bottom: 4px;
}

/* ===== 返回顶部 ===== */
#backTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border: none;
    padding: 14px 18px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-fast);
    z-index: 999;
    display: none;
}

#backTop:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    background: var(--accent);
}

/* ===== 滚动动画 ===== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== 自定义滚动条 ===== */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary), var(--primary-light));
    border-radius: 10px;
    border: 2px solid var(--bg-main);
}

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

/* ===== 选中文字样式 ===== */
::selection {
    background: var(--accent);
    color: var(--text-white);
}

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

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 40px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 40px; }

.py-1 { padding-top: 8px; padding-bottom: 8px; }
.py-2 { padding-top: 16px; padding-bottom: 16px; }
.py-3 { padding-top: 24px; padding-bottom: 24px; }
.py-4 { padding-top: 32px; padding-bottom: 32px; }
.py-5 { padding-top: 40px; padding-bottom: 40px; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    
    .search-box input {
        width: 140px;
    }
}

@media (max-width: 900px) {
    .nav-links {
        display: none;
        flex-direction: column;
        width: 100%;
        background: var(--bg-card);
        padding: 20px;
        border-radius: 16px;
        box-shadow: var(--shadow-lg);
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        margin: 0 24px;
        z-index: 100;
        border: 1px solid var(--border-light);
    }
    
    .nav-links.open {
        display: flex;
        animation: slideDown 0.3s ease;
    }
    
    @keyframes slideDown {
        from {
            opacity: 0;
            transform: translateY(-10px);
        }
        to {
            opacity: 1;
            transform: translateY(0);
        }
    }
    
    .nav-links a {
        padding: 12px 0;
        border-bottom: 1px solid var(--border-light);
    }
    
    .nav-links a::after {
        display: none;
    }
    
    .nav-links li:last-child a {
        border-bottom: none;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .search-box {
        display: none;
    }
    
    .nav-container {
        padding: 12px 24px;
    }
    
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
    
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .banner {
        padding: 60px 0 70px;
    }
    
    .banner h1 {
        font-size: 2.2rem;
    }
}

@media (max-width: 600px) {
    .container {
        padding: 0 16px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.4rem;
    }
    
    .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .card, .article-card, .faq-item, .case-item, .howto-box {
        padding: 20px;
    }
    
    .banner h1 {
        font-size: 1.8rem;
    }
    
    .banner p {
        font-size: 1rem;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .dark-toggle {
        padding: 8px 14px;
        font-size: 0.8rem;
    }
    
    .btn-primary, .btn-outline, .btn-light {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
    
    #backTop {
        bottom: 20px;
        right: 20px;
        padding: 12px 16px;
        font-size: 1rem;
    }
    
    .nav-links {
        margin: 0 16px;
    }
}

@media (max-width: 400px) {
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .logo a {
        font-size: 1.3rem;
    }
    
    .dark-toggle {
        padding: 8px 12px;
        font-size: 0.75rem;
    }
    
    .nav-actions {
        gap: 8px;
    }
}

/* ===== 打印样式 ===== */
@media print {
    .navbar, .footer, #backTop, .dark-toggle, .menu-toggle, .search-box {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .card, .article-card, .faq-item, .case-item, .howto-box {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
    
    .banner {
        background: none;
        color: black;
        padding: 20px 0;
    }
    
    .banner h1 {
        color: black;
        -webkit-text-fill-color: black;
    }
    
    .banner p {
        color: #333;
    }
}

/* ===== 动画增强 ===== */
.hover-lift {
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.hover-lift:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.hover-scale {
    transition: transform var(--transition-fast);
}

.hover-scale:hover {
    transform: scale(1.02);
}

.hover-glow {
    transition: box-shadow var(--transition-fast);
}

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

/* ===== 装饰元素 ===== */
.section-badge {
    display: inline-block;
    background: var(--gradient-accent);
    color: var(--text-white);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.divider {
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: 4px;
    margin: 24px 0;
}

/* ===== 暗色模式下的额外调整 ===== */
body.dark-mode .section-badge {
    background: var(--gradient-accent);
}

body.dark-mode .divider {
    background: var(--gradient-accent);
}

body.dark-mode .banner {
    background: var(--gradient-banner);
}

body.dark-mode .banner h1 {
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

/* ===== 性能优化 ====
   使用 transform 和 opacity 做动画
   避免重排重绘
   过渡使用 GPU 加速属性
===== */
.card, .article-card, .faq-item, .case-item, .howto-box,
.btn-primary, .btn-outline, .btn-light, .dark-toggle,
.nav-links a, .logo a, .search-box button, #backTop {
    will-change: transform;
}

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

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

/* ===== 结束 ===== */
```