/* 
 * 全局变量与主题色彩
 * 采用小清新、科技感、极简主义风格
 */
:root {
    --color-primary: #00B8D9;
    --color-primary-dark: #0098B3;
    --color-primary-light: #E6F8FB;
    --color-bg-main: #FFFFFF;
    --color-bg-muted: #F8FAFC;
    --color-text-main: #0F172A;
    --color-text-muted: #64748B;
    --color-border: #E2E8F0;
    --color-white: #FFFFFF;
    
    --color-binance: #4F46E5;
    --color-binance-hover: #4338CA;
    --color-binance-text: #4F46E5;
    
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 9999px;
    
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--color-bg-main);
    color: var(--color-text-main);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

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

/* 布局容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 500;
    font-size: 15px;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
}

.btn-primary {
    background-color: var(--color-primary);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-binance {
    background-color: var(--color-binance);
    color: #FFFFFF;
}

.btn-binance:hover {
    background-color: var(--color-binance-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(79, 70, 229, 0.2);
}

.text-binance {
    color: var(--color-binance-text);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-border);
    color: var(--color-text-main);
}

.btn-outline:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

/* 导航栏 */
.disclaimer-banner {
    background-color: #FFFBEB;
    color: #B45309;
    text-align: center;
    padding: 8px 0;
    font-size: 12px;
    border-bottom: 1px solid #FEF3C7;
    position: relative;
    z-index: 1001;
}

.navbar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    height: 72px;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    position: relative;
}

.nav-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
}

.nav-center a {
    text-decoration: none;
    color: var(--color-text-main);
    font-weight: 500;
    font-size: 15px;
    transition: var(--transition);
}

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

.nav-right {
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 20px;
    color: var(--color-primary);
}
.logo::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 24px;
  background-repeat: no-repeat;
  background-size: 100% 100%;
  background-image: url("/logo.svg");
  transform: rotate(-90deg);
}


.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 15px;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: var(--transition);
}

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

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

/* 多语种选择器 (原生实现) */
.lang-selector {
    position: relative;
}

.lang-current {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 3px 8px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.lang-current:hover {
    background-color: var(--color-bg-muted);
    color: var(--color-text-main);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 120px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 100;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.lang-selector.active .lang-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    padding: 5px 8px;
    font-size: 12px;
    color: var(--color-text-muted);
    transition: var(--transition);
}

.lang-option:hover {
    background-color: var(--color-bg-muted);
    color: var(--color-text-main);
}

.lang-option.active {
    color: var(--color-primary);
    font-weight: 500;
    background-color: var(--color-primary-light);
}

/* 页面通用区块 */
.section {
    padding: 100px 0;
}

.bg-muted {
    background-color: var(--color-bg-muted);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-header h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--color-text-main);
}

.section-header p {
    font-size: 16px;
    color: var(--color-text-muted);
}

/* 主屏 (Hero) */
.hero {
    padding: 110px 0 100px;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 64px;
    align-items: center;
}

.badge {
    display: inline-block;
    padding: 6px 12px;
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary), #3B82F6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    font-size: 18px;
    color: var(--color-text-muted);
    margin-bottom: 40px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.hero .hero-trust {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-top: 32px;
}

.hero .trust-item {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 500;
    color: var(--color-text-muted);
    background: var(--color-bg-main);
    padding: 5px 16px;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.hero .trust-item svg {
    flex-shrink: 0;
    color: var(--color-binance-hover);
}

.trust-indicators {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 24px;
}

.trust-indicators span {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 5px 14px;
    border-radius: var(--radius-full);
    border: 1px solid rgba(0, 184, 217, 0.16);
    background: linear-gradient(180deg, #FFFFFF 0%, var(--color-bg-muted) 100%);
    box-shadow: var(--shadow-sm);
    color: var(--color-text-main);
    font-size: 12px;
    font-weight: 600;
    line-height: 1.4;
}

.trust-indicators svg {
    flex-shrink: 0;
    color: #0ECB81;
}

/* 主屏右侧卡片集合 (重设计为玻璃拟物风) */
.hero-visual-container {
    position: relative;
    width: 100%;
    height: 480px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.bg-blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    z-index: 0;
}

.blob-1 {
    width: 300px;
    height: 300px;
    background: rgba(252, 213, 53, 0.2);
    top: 0;
    right: 0;
}

.blob-2 {
    width: 250px;
    height: 250px;
    background: rgba(0, 184, 217, 0.2);
    bottom: 0;
    left: 20px;
}

.glass-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.6);
    border-radius: 24px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.08);
    padding: 32px;
    position: absolute;
    z-index: 1;
}

.card-offer {
    top: 20px;
    right: 0;
    width: 320px;
    animation: float 6s ease-in-out infinite;
}

.card-stats {
    bottom: 40px;
    left: 0;
    width: 280px;
    animation: float 8s ease-in-out infinite reverse;
}

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

.offer-highlight {
    font-size: 48px;
    font-weight: 800;
    color: #181A20;
    margin: 16px 0;
    line-height: 1;
}

.offer-highlight span {
    font-size: 20px;
    color: var(--color-text-muted);
    font-weight: 600;
}

.offer-list {
    list-style: none;
    margin-bottom: 24px;
}

.offer-list li {
    font-size: 15px;
    color: var(--color-text-main);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.offer-list li::before {
    content: '✓';
    color: #0ECB81;
    font-weight: bold;
}

.stat-row {
    margin-bottom: 16px;
}

.stat-row:last-child {
    margin-bottom: 0;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--color-text-main);
}

.stat-label {
    font-size: 14px;
    color: var(--color-text-muted);
}

.stat-divider {
    height: 1px;
    background: var(--color-border);
    margin: 16px 0;
}

/* 三列网格 (生态) */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.info-card {
    background-color: var(--color-white);
    padding: 0;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
    overflow: hidden;
}

.info-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* CSS 纯代码绘制插图 */
.css-illust {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-bg-muted) 0%, #e2e8f0 100%);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Academy: 书本 */
.illust-academy .book-cover {
    width: 80px;
    height: 60px;
    background: var(--color-primary);
    border-radius: 4px;
    position: relative;
    transform: perspective(200px) rotateX(20deg);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}
.illust-academy .book-page {
    position: absolute;
    top: 5px;
    left: 5px;
    right: -5px;
    bottom: 5px;
    background: var(--color-white);
    border-radius: 2px;
}

/* Labs: 增长柱状图 */
.illust-labs .bar {
    width: 24px;
    background: var(--color-primary);
    margin: 0 6px;
    border-radius: 4px 4px 0 0;
    align-self: flex-end;
    margin-bottom: 40px;
}
.illust-labs .bar-1 { height: 40px; opacity: 0.4; }
.illust-labs .bar-2 { height: 70px; opacity: 0.7; }
.illust-labs .bar-3 { height: 100px; background: var(--color-binance); }

/* Chain: 节点网络 */
.illust-chain .node {
    width: 24px;
    height: 24px;
    background: var(--color-primary);
    border-radius: 50%;
    position: absolute;
    box-shadow: 0 0 0 6px rgba(0,184,217,0.2);
}
.illust-chain .node-1 { top: 60px; left: 80px; }
.illust-chain .node-2 { bottom: 60px; right: 80px; }
.illust-chain .node-3 { top: 80px; right: 100px; background: var(--color-binance); box-shadow: 0 0 0 6px rgba(79, 70, 229, 0.2); }
.illust-chain .line {
    position: absolute;
    background: var(--color-border);
    height: 2px;
}
.illust-chain .line-1 {
    width: 120px;
    top: 100px;
    left: 90px;
    transform: rotate(25deg);
}

.info-card h4 {
    font-size: 20px;
    font-weight: 600;
    margin: 24px 24px 16px;
    color: var(--color-text-main);
}

.info-card p {
    color: var(--color-text-muted);
    font-size: 15px;
    margin: 0 24px 32px;
}

/* 注册教程板块 */
.guide-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.step-card {
    background: var(--color-white);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    position: relative;
    transition: var(--transition);
    overflow: hidden;
}

.step-card:hover {
    border-color: var(--color-binance);
    box-shadow: var(--shadow-md);
    transform: translateY(-5px);
}

.step-number {
    font-size: 64px;
    font-weight: 900;
    color: var(--color-bg-muted);
    position: absolute;
    top: -10px;
    right: 10px;
    line-height: 1;
    z-index: 0;
    opacity: 0.7;
}

.step-card h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    position: relative;
    z-index: 1;
    color: var(--color-text-main);
}

.step-card p {
    font-size: 14px;
    color: var(--color-text-muted);
    position: relative;
    z-index: 1;
}

/* 安全特性列表 */
.security-features {
    display: flex;
    flex-direction: column;
    gap: 32px;
    max-width: 800px;
    margin: 0 auto;
}

.security-item {
    display: flex;
    gap: 24px;
    align-items: flex-start;
    padding: 32px;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.security-item:hover {
    box-shadow: var(--shadow-md);
}

.security-icon {
    flex-shrink: 0;
    color: var(--color-primary);
}

.security-item h4 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.security-item p {
    color: var(--color-text-muted);
    font-size: 16px;
}

/* 评测网格 */
.review-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.review-box {
    background-color: var(--color-white);
    padding: 40px 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    text-align: center;
}

.review-score {
    font-size: 36px;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.review-box h4 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 16px;
}

.review-box p {
    font-size: 14px;
    color: var(--color-text-muted);
}

/* 优缺点对比板块 */
.pros-cons-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    max-width: 1000px;
    margin: 0 auto;
}

.pros-box, .cons-box {
    background-color: var(--color-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.pros-box {
    border-top: 4px solid #0ECB81;
}

.cons-box {
    border-top: 4px solid #F6465D;
}

.text-success {
    color: #0ECB81;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}

.text-danger {
    color: #F6465D;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 24px;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    position: relative;
    padding-left: 32px;
    margin-bottom: 16px;
    color: var(--color-text-main);
    font-size: 15px;
    line-height: 1.6;
}

.feature-list li:last-child {
    margin-bottom: 0;
}

.check-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    top: 0;
    color: #0ECB81;
    font-weight: bold;
    font-size: 18px;
}

.cross-list li::before {
    content: '✕';
    position: absolute;
    left: 0;
    top: 0;
    color: #F6465D;
    font-weight: bold;
    font-size: 16px;
}

/* 进阶指南板块 (文章卡片) */
.article-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.article-card {
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    overflow: hidden;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary-light);
}

.article-content {
    padding: 30px;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
    font-size: 13px;
}

.article-category {
    background-color: rgba(14, 203, 129, 0.1);
    color: #0ECB81;
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
}

.article-date {
    color: var(--color-text-muted);
}

.article-card h3 {
    font-size: 18px;
    margin-bottom: 12px;
    line-height: 1.4;
}

.article-card h3 a {
    color: var(--color-text-main);
    text-decoration: none;
    transition: var(--transition);
}

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

.article-card p {
    color: var(--color-text-muted);
    font-size: 14px;
    line-height: 1.6;
    margin-bottom: 24px;
    flex-grow: 1;
}

.article-read-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 14px;
    text-decoration: none;
    transition: var(--transition);
}

.article-read-more:hover {
    gap: 12px;
}

/* 文章详情页样式 */
.article-page {
    padding: 120px 0 0;
    background-color: var(--color-bg);
}

.article-container {
    max-width: 800px;
    margin: 0 auto 60px;
    background: var(--color-white);
    padding: 50px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 24px;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--color-primary);
}

.article-header {
    margin-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 24px;
}

body > .article-header {
    margin-top: 40px;
}

.article-header h1 {
    font-size: 32px;
    margin-bottom: 16px;
    line-height: 1.4;
    color: var(--color-text-main);
}

.article-body h2 {
    font-size: 24px;
    margin: 48px 0 20px;
    color: var(--color-text-main);
    border-left: 4px solid var(--color-primary);
    padding-left: 16px;
}

.article-body h3 {
    font-size: 20px;
    margin: 32px 0 16px;
    color: var(--color-text-main);
}

.article-body p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.article-body ul, .article-body ol {
    margin-bottom: 24px;
    padding-left: 24px;
    color: var(--color-text-muted);
    line-height: 1.8;
}

.article-body li {
    margin-bottom: 10px;
}

.article-body strong {
    color: var(--color-text-main);
}

.article-cta {
    margin-top: 50px;
    padding: 40px;
    background: rgba(240, 185, 11, 0.05);
    border-radius: var(--radius-md);
    text-align: center;
    border: 1px dashed var(--color-primary);
}

.article-cta h3 {
    margin-top: 0;
    margin-bottom: 16px;
    color: var(--color-text-main);
}

.article-cta p {
    margin-bottom: 24px;
}

@media (max-width: 768px) {
    .article-container {
        padding: 30px 20px;
    }
    .article-header h1 {
        font-size: 26px;
    }
    .article-body h2 {
        font-size: 22px;
    }
}

/* Breadcrumb */
.breadcrumb {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}
.breadcrumb a:hover {
    text-decoration: underline;
}
.breadcrumb span {
    color: var(--color-text-main);
}

/* Article Layout with Sidebar */
.article-container.with-sidebar {
    display: flex;
    gap: 40px;
    max-width: 1100px; /* Wider to accommodate sidebar */
    align-items: flex-start;
    padding: 40px;
}
.article-container.with-sidebar .article-body {
    flex: 1;
    min-width: 0; /* Prevent flex blowout */
}

/* Sidebar Styles */
.article-sidebar {
    width: 300px;
    flex-shrink: 0;
    position: sticky;
    top: 100px;
}
.sidebar-widget {
    background: var(--color-bg-alt);
    padding: 24px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
    border: 1px solid var(--color-border);
}
.sidebar-widget h3 {
    font-size: 18px;
    margin-top: 0;
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-main);
}
.toc-list {
    list-style: none;
    padding: 0;
    margin: 0;
}
.toc-list li {
    margin-bottom: 12px;
}
.toc-list li:last-child {
    margin-bottom: 0;
}
.toc-list a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
    display: block;
    line-height: 1.5;
}
.toc-list a:hover {
    color: var(--color-primary);
}

/* Info & Warning Boxes */
.info-box, .warning-box {
    padding: 20px;
    border-radius: var(--radius-md);
    margin-bottom: 24px;
}
.info-box {
    background-color: rgba(7, 110, 255, 0.05);
    border-left: 4px solid var(--color-primary);
}
.warning-box {
    background-color: rgba(215, 58, 73, 0.05);
    border-left: 4px solid var(--color-danger);
}
.info-box strong, .warning-box strong {
    display: block;
    margin-bottom: 8px;
    font-size: 16px;
    color: var(--color-text-main);
}
.info-box p, .warning-box p {
    margin-bottom: 0;
    font-size: 15px;
}
.warning-box ul {
    margin-bottom: 0;
    margin-top: 8px;
}

@media (max-width: 992px) {
    .article-container.with-sidebar {
        flex-direction: column;
        padding: 30px 20px;
    }
    .article-sidebar {
        width: 100%;
        position: static;
        margin-top: 40px;
    }
}

/* 常见问题 (FAQ) */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    overflow: hidden;
}

.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    font-size: 16px;
    color: var(--color-text-main);
    user-select: none;
}

.faq-question svg {
    color: var(--color-text-muted);
    transition: transform 0.3s ease;
}

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

.faq-answer {
    display: grid;
    grid-template-rows: 0fr;
    transition: grid-template-rows 0.3s ease;
    background-color: var(--color-bg-muted);
}

.faq-answer > div {
    overflow: hidden;
}

.faq-item.active .faq-answer {
    grid-template-rows: 1fr;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--color-text-muted);
    font-size: 15px;
}

/* 页脚 */
.footer {
    background-color: var(--color-white);
    border-top: 1px solid var(--color-border);
    padding: 80px 0 40px;
}

/* 弹窗样式 */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background-color: var(--color-white);
    width: 90%;
    max-width: 600px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transform: translateY(20px);
    transition: var(--transition);
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text-main);
}

.modal-close {
    background: none;
    border: none;
    font-size: 28px;
    line-height: 1;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--color-text-main);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
}

.modal-body p {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

.modal-body p:last-child {
    margin-bottom: 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 64px;
    margin-bottom: 60px;
}

.footer-desc {
    margin-top: 16px;
    color: var(--color-text-muted);
    font-size: 14px;
    max-width: 300px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.link-group h5 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--color-text-main);
}

.link-group a {
    display: block;
    color: var(--color-text-muted);
    font-size: 14px;
    margin-bottom: 12px;
    transition: var(--transition);
}

.link-group a:hover {
    color: var(--color-primary);
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 13px;
}

/* 响应式设计 (媒体查询) */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 48px;
    }
    
    .hero-content p {
        margin: 0 auto 40px;
    }
    
    .hero-actions {
        justify-content: center;
    }

    .hero .hero-trust {
        justify-content: center;
    }

    .trust-indicators {
        justify-content: center;
    }
    
    .feature-card.translate-y {
        transform: translateY(0);
    }
    
    .feature-card.translate-y:hover {
        transform: translateY(-5px);
    }
    
    .grid-3, .review-grid, .guide-steps, .pros-cons-grid, .article-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hide-on-mobile {
        display: none;
    }
    
    .nav-center {
        position: static;
        transform: none;
    }

    .nav-links {
        display: none;
    }
    
    .hero-content h1 {
        font-size: 36px;
    }
    
    .hero-visual-container {
        height: auto;
        min-height: 400px;
    }
    
    .card-offer, .card-stats {
        position: relative;
        top: auto;
        bottom: auto;
        left: auto;
        right: auto;
        width: 100%;
        margin-bottom: 20px;
        animation: none;
    }
    
    .grid-3, .review-grid, .guide-steps, .pros-cons-grid, .article-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .hero {
        padding: 120px 0 60px;
    }

    .hero .hero-trust {
        gap: 10px;
    }

    .hero .trust-item {
        width: 100%;
        justify-content: center;
    }

    .trust-indicators {
        gap: 10px;
    }

    .trust-indicators span {
        width: 100%;
        justify-content: center;
    }
}

.article-author {
    max-width: 1200px;
    margin: auto;
    padding: 0 24px;
    display: flex; align-items: center; gap: 12px; margin-top: 24px; padding-top: 20px; border-top: 1px solid var(--color-border);
}
.btn-sm, .nav-actions .btn {
    padding: 3px 8px;
    font-size: 0.8rem;
}