```css
/* ---------- 颜色体系 高可读性 ---------- */
:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-card: #ffffff;
    --bg-footer: #0f172a;
    --bg-nav: rgba(255, 255, 255, 0.85);
    --text-primary: #1e293b;
    --text-title: #0f172a;
    --text-secondary: #334155;
    --text-footer: #e2e8f0;
    --text-footer-muted: #cbd5e1;
    --accent: #2563eb;
    --accent-dark: #1e40af;
    --border-color: #cbd5e1;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
    --hover-bg: #f1f5f9;
    --gradient-start: #667eea;
    --gradient-end: #764ba2;
}

/* 暗色模式变量 */
[data-theme="dark"] {
    --bg-primary: #0b1120;
    --bg-secondary: #111827;
    --bg-card: #1e293b;
    --bg-footer: #020617;
    --bg-nav: rgba(15, 23, 42, 0.9);
    --text-primary: #e2e8f0;
    --text-title: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-footer: #f1f5f9;
    --text-footer-muted: #94a3b8;
    --accent: #3b82f6;
    --accent-dark: #60a5fa;
    --border-color: #334155;
    --hover-bg: #1e293b;
    --gradient-start: #4f46e5;
    --gradient-end: #7c3aed;
}

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

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

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.7;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

h1, h2, h3, h4 {
    color: var(--text-title);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 0.75rem;
}

h1 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 700;
    background: linear-gradient(135deg, var(--text-title), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    position: relative;
    padding-bottom: 12px;
    margin-bottom: 24px;
}

h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gradient-end));
    border-radius: 2px;
}

h3 {
    font-size: 1.2rem;
}

h4 {
    font-size: 1rem;
}

p {
    color: var(--text-primary);
    margin-bottom: 1rem;
    line-height: 1.8;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

ul, ol {
    padding-left: 1.5rem;
    margin-bottom: 1rem;
}

li {
    color: var(--text-primary);
    margin-bottom: 8px;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    transition: all 0.3s ease;
}

input {
    font-family: inherit;
}

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

section {
    margin: 48px 0;
    scroll-margin-top: 80px;
}

section > h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

/* ---------- 导航栏 ---------- */
.navbar {
    background: var(--bg-nav);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
    gap: 16px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-title);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.logo span {
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
    flex: 1;
    justify-content: center;
}

.nav-links a {
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    padding: 4px 0;
    transition: color 0.3s ease;
}

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

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

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

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

.theme-toggle, .search-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.2rem;
    color: var(--text-title);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.theme-toggle:hover, .search-btn:hover {
    background: var(--hover-bg);
    transform: rotate(20deg);
}

.mobile-menu {
    display: none;
    background: none;
    border: none;
    font-size: 1.8rem;
    color: var(--text-title);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.mobile-menu:hover {
    background: var(--hover-bg);
}

/* ---------- 搜索框 ---------- */
.search-wrap {
    display: flex;
    align-items: center;
    gap: 4px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    padding: 4px 4px 4px 16px;
    transition: all 0.3s ease;
    width: 200px;
}

.search-wrap:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    width: 240px;
}

.search-wrap input {
    padding: 6px 0;
    border: none;
    background: transparent;
    color: var(--text-primary);
    outline: none;
    width: 100%;
    font-size: 0.9rem;
}

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

.search-btn {
    font-size: 1rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--accent);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    flex-shrink: 0;
}

.search-btn:hover {
    background: var(--accent-dark);
    transform: scale(1.05);
}

/* ---------- Banner ---------- */
.banner {
    background: linear-gradient(145deg, var(--gradient-start), var(--gradient-end));
    border: none;
    border-radius: 32px;
    padding: clamp(32px, 5vw, 56px);
    margin: 32px 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    position: relative;
    overflow: hidden;
    color: white;
}

.banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 60%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    transform: rotate(20deg);
    border-radius: 50%;
    pointer-events: none;
}

.banner::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -10%;
    width: 40%;
    height: 100%;
    background: rgba(255, 255, 255, 0.05);
    transform: rotate(-15deg);
    border-radius: 50%;
    pointer-events: none;
}

.banner-text {
    flex: 2;
    min-width: 280px;
    position: relative;
    z-index: 1;
}

.banner-text h1 {
    background: linear-gradient(135deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 16px;
    line-height: 1.2;
}

.banner-text p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.8;
    margin-bottom: 24px;
}

.banner-cta {
    background: #ffffff;
    color: var(--gradient-start);
    padding: 12px 32px;
    border-radius: 40px;
    border: none;
    font-weight: 600;
    cursor: pointer;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.banner-cta:hover {
    background: #f0f0f0;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
}

.banner-visual {
    flex: 1;
    min-width: 200px;
    text-align: center;
    position: relative;
    z-index: 1;
}

.banner-visual svg {
    animation: float 6s ease-in-out infinite;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* ---------- 卡片网格 ---------- */
.grid-2, .grid-3, .grid-4 {
    display: grid;
    gap: 24px;
    margin: 32px 0;
}

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

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gradient-end));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.1);
}

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

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 12px;
    color: var(--text-title);
}

.card h4 {
    font-size: 1.1rem;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.card p, .card li {
    color: var(--text-primary);
    font-size: 0.95rem;
}

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

.card .btn-outline {
    display: inline-block;
    margin-top: 12px;
    padding: 8px 20px;
    border: 1px solid var(--accent);
    color: var(--accent);
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
}

.card .btn-outline:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    text-decoration: none;
}

/* ---------- 列表 ---------- */
.article-list {
    list-style: none;
    padding: 0;
}

.article-list li {
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
    transition: padding-left 0.3s ease;
}

.article-list li:hover {
    padding-left: 8px;
}

.article-list a {
    font-weight: 500;
}

/* ---------- FAQ ---------- */
details {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 16px 24px;
    margin: 12px 0;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

details:hover {
    border-color: var(--accent);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.1);
}

details[open] {
    border-color: var(--accent);
    background: var(--bg-secondary);
}

summary {
    font-weight: 600;
    cursor: pointer;
    color: var(--text-title);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    list-style: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    line-height: 1;
}

details[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}

details p {
    margin-top: 12px;
    color: var(--text-primary);
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
}

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

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    min-width: 600px;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

th {
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    color: white;
    font-weight: 600;
}

td {
    color: var(--text-primary);
}

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

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

/* ---------- 页脚 ---------- */
.footer-bg {
    background: var(--bg-footer);
    color: var(--text-footer);
    margin-top: 60px;
    position: relative;
    overflow: hidden;
}

.footer-bg::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--gradient-end), var(--accent));
}

.footer-bg .container {
    padding-top: 48px;
    padding-bottom: 32px;
    position: relative;
    z-index: 1;
}

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

.footer-bg h4 {
    color: var(--text-footer);
    font-size: 1.1rem;
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 8px;
}

.footer-bg h4::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--accent);
    border-radius: 2px;
}

.footer-bg a {
    color: var(--text-footer-muted);
    transition: all 0.3s ease;
    text-decoration: none;
}

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

.footer-bg p, .footer-bg li {
    color: var(--text-footer-muted);
    font-size: 0.9rem;
    line-height: 1.8;
}

.footer-bg ul {
    list-style: none;
    padding: 0;
}

.footer-bg ul li {
    margin-bottom: 8px;
}

.copyright {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 40px;
    padding-top: 24px;
    text-align: center;
    color: var(--text-footer-muted);
}

.copyright p {
    color: var(--text-footer-muted);
    font-size: 0.85rem;
    margin: 0;
}

/* ---------- 按钮和标签 ---------- */
.badge {
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    color: white;
    padding: 4px 12px;
    border-radius: 30px;
    font-size: 0.8rem;
    font-weight: 500;
    display: inline-block;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.2);
}

.btn-outline {
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 8px 20px;
    border-radius: 40px;
    background: transparent;
    font-weight: 500;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-outline:hover {
    background: var(--accent);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
    text-decoration: none;
}

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

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

/* ---------- 返回顶部 ---------- */
.scroll-top {
    position: fixed;
    bottom: 24px;
    right: 24px;
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    cursor: pointer;
    border: none;
    z-index: 1000;
    transition: all 0.3s ease;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.scroll-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

/* ---------- 联系部分 ---------- */
#contact .card p {
    line-height: 2;
}

/* ---------- 操作流程 ---------- */
#howto ol {
    counter-reset: step;
    padding-left: 0;
    list-style: none;
}

#howto ol li {
    counter-increment: step;
    position: relative;
    padding-left: 48px;
    margin-bottom: 16px;
    line-height: 1.8;
}

#howto ol li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.9rem;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
}

/* ---------- 全屏覆盖 ---------- */
::selection {
    background: var(--accent);
    color: white;
}

::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

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

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--accent), var(--gradient-end));
    border-radius: 5px;
    border: 2px solid var(--bg-primary);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .search-wrap { width: 160px; }
    .search-wrap:focus-within { width: 200px; }
}

@media (max-width: 768px) {
    .container { padding: 0 16px; }
    
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    
    .grid-2 .card, .grid-3 .card, .grid-4 .card {
        padding: 20px;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background: var(--bg-nav);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 16px 24px;
        gap: 12px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        width: 100%;
        padding: 12px 16px;
        border-radius: 12px;
        transition: background 0.3s ease;
    }
    
    .nav-links a:hover {
        background: var(--hover-bg);
    }
    
    .nav-links a::after {
        display: none;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .search-wrap {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
    
    .banner {
        padding: 32px 24px;
        gap: 24px;
    }
    
    .banner-text h1 {
        font-size: 1.8rem;
    }
    
    .banner-text p {
        font-size: 1rem;
    }
    
    section {
        margin: 32px 0;
    }
    
    .scroll-top {
        bottom: 16px;
        right: 16px;
        width: 40px;
        height: 40px;
        font-size: 1.2rem;
    }
}

@media (max-width: 520px) {
    body {
        font-size: 15px;
    }
    
    .container {
        padding: 0 12px;
    }
    
    .banner-text h1 {
        font-size: 1.5rem;
    }
    
    .banner-text p {
        font-size: 0.95rem;
    }
    
    .banner-cta {
        padding: 10px 24px;
        font-size: 0.9rem;
        width: 100%;
        justify-content: center;
    }
    
    .banner-visual svg {
        width: 160px;
        height: 90px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .card {
        padding: 16px;
    }
    
    .grid-2, .grid-3, .grid-4 {
        gap: 16px;
    }
    
    h2 {
        font-size: 1.3rem;
    }
    
    .logo {
        font-size: 1.3rem;
    }
    
    .theme-toggle {
        font-size: 1rem;
        width: 36px;
        height: 36px;
    }
    
    .mobile-menu {
        font-size: 1.5rem;
        width: 36px;
        height: 36px;
    }
    
    .copyright p {
        font-size: 0.8rem;
    }
}

/* ---------- 打印优化 ---------- */
@media print {
    .navbar,
    .scroll-top,
    .theme-toggle,
    .mobile-menu,
    .search-wrap,
    .footer-bg,
    .banner-cta {
        display: none !important;
    }
    
    body {
        background: white;
        color: black;
        font-size: 12pt;
    }
    
    .container {
        max-width: 100%;
        padding: 0;
    }
    
    .banner {
        background: none;
        border: 1px solid #ddd;
        color: black;
        padding: 20px;
        box-shadow: none;
    }
    
    .banner-text h1 {
        color: black;
        -webkit-text-fill-color: black;
        background: none;
    }
    
    .banner-text p {
        color: #333;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
    
    .card:hover {
        transform: none;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    .footer-bg {
        background: none;
        color: black;
    }
    
    .footer-bg a,
    .footer-bg p,
    .footer-bg li {
        color: #333;
    }
}
```