/* ============================
   币安指南 - 主样式表
   ============================ */

/* CSS 变量 - 品牌色板 */
:root {
    --primary: #F0B90B;
    --primary-dark: #DBA50A;
    --primary-light: #FCE68A;
    --bg-dark: #1E2329;
    --bg-medium: #2B3139;
    --bg-light: #F5F5F5;
    --text-dark: #1E2329;
    --text-medium: #474D57;
    --text-light: #848E9C;
    --text-white: #FFFFFF;
    --border-color: #E5E5E5;
    --card-shadow: 0 4px 20px rgba(0,0,0,0.08);
    --card-radius: 16px;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: #333;
    line-height: 1.6;
    background: #fff;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(30, 35, 41, 0.95);
    backdrop-filter: blur(10px);
    padding: 0;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(30, 35, 41, 0.98);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-white);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 5px;
    list-style: none;
}

.nav-links a {
    color: var(--text-white);
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
    opacity: 0.8;
}

.nav-links a:hover,
.nav-links a.active {
    opacity: 1;
    background: rgba(255,255,255,0.1);
}

.nav-links a.nav-admin {
    background: var(--primary);
    color: var(--text-dark);
    opacity: 1;
}

.nav-links a.nav-admin:hover {
    background: var(--primary-dark);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-white);
    margin: 3px 0;
    transition: var(--transition);
}

/* Hero 区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    overflow: hidden;
    padding: 100px 20px 60px;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 50% 0%, rgba(240, 185, 11, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 80%, rgba(240, 185, 11, 0.05) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-logo {
    height: 60px;
    margin-bottom: 30px;
    filter: brightness(1.1);
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-bottom: 50px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(240, 185, 11, 0.3);
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    color: var(--text-white);
    border: 2px solid rgba(255,255,255,0.2);
}

.btn-secondary:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.btn-text {
    background: transparent;
    color: var(--primary);
    padding: 8px 0;
}

.btn-text:hover {
    color: var(--primary-dark);
    gap: 12px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 5px;
}

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

/* 区域标题 */
.section-title {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 16px;
    color: var(--text-medium);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
}

/* 特色区域 */
.features {
    padding: 100px 0;
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: #fff;
    padding: 40px 30px;
    border-radius: var(--card-radius);
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    color: var(--text-dark);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
}

.feature-card p {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: var(--bg-dark);
}

.download .section-title {
    color: var(--text-white);
}

.download .section-desc {
    color: var(--text-light);
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.download-card {
    background: var(--bg-medium);
    border-radius: var(--card-radius);
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.05);
}

.download-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(240, 185, 11, 0.1);
}

.download-icon {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 20px;
}

.download-card h3 {
    font-size: 24px;
    color: var(--text-white);
    margin-bottom: 8px;
}

.download-card p {
    color: var(--text-light);
    margin-bottom: 20px;
}

.download-info {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 25px;
    font-size: 13px;
    color: var(--text-light);
}

.download-btn {
    width: 100%;
    justify-content: center;
    margin-bottom: 12px;
}

.download-tip {
    font-size: 12px;
    color: var(--text-light);
}

/* 文章区域 */
.articles {
    padding: 100px 0;
    background: var(--bg-light);
}

.category-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.category-tab {
    padding: 8px 20px;
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: var(--transition);
}

.category-tab:hover {
    border-color: var(--primary);
}

.category-tab.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-dark);
}

.articles-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.article-card {
    background: #fff;
    border-radius: var(--card-radius);
    padding: 30px;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
}

.article-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
}

.article-category {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-light);
    color: var(--text-dark);
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.article-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-dark);
    line-height: 1.4;
}

.article-desc {
    font-size: 14px;
    color: var(--text-medium);
    line-height: 1.6;
    margin-bottom: 16px;
}

.article-meta {
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 16px;
}

.article-meta i {
    margin-right: 5px;
}

/* 分页 */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
    margin-top: 50px;
}

.page-btn {
    padding: 10px 16px;
    background: #fff;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition);
}

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

.page-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--text-dark);
}

/* 常见问题 */
.faq {
    padding: 100px 0;
    background: #fff;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: 12px;
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    cursor: pointer;
    transition: var(--transition);
}

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

.faq-question h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-dark);
}

.faq-toggle {
    color: var(--primary);
    font-size: 16px;
    transition: var(--transition);
}

.faq-item.active .faq-toggle {
    transform: rotate(45deg);
}

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

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

.faq-answer p {
    font-size: 15px;
    color: var(--text-medium);
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-logo {
    height: 40px;
    margin-bottom: 20px;
    filter: brightness(1.1);
}

.footer-brand p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.8;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-white);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

.footer-links a {
    color: var(--text-light);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

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

.footer-contact p {
    font-size: 14px;
    color: var(--text-light);
    margin-bottom: 10px;
}

.footer-contact i {
    margin-right: 8px;
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition);
}

.social-link:hover {
    background: var(--primary);
    color: var(--text-dark);
    transform: translateY(-2px);
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--text-light);
}

/* 文章内容页 */
.article-page {
    padding: 120px 0 60px;
    min-height: 100vh;
    background: var(--bg-light);
}

.article-header {
    text-align: center;
    margin-bottom: 50px;
}

.article-header .article-category {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary);
    color: var(--text-dark);
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 20px;
}

.article-header h1 {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.3;
}

.article-description {
    font-size: 16px;
    color: var(--text-medium);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.article-content {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 50px;
    border-radius: var(--card-radius);
    box-shadow: var(--card-shadow);
    font-size: 16px;
    line-height: 1.8;
    color: #333;
}

.article-content h2 {
    font-size: 28px;
    font-weight: 700;
    margin: 40px 0 20px;
    color: var(--text-dark);
}

.article-content h3 {
    font-size: 22px;
    font-weight: 600;
    margin: 30px 0 16px;
    color: var(--text-dark);
}

.article-content p {
    margin-bottom: 16px;
}

.article-content ul,
.article-content ol {
    margin: 16px 0;
    padding-left: 24px;
}

.article-content li {
    margin-bottom: 8px;
}

.article-content img {
    max-width: 100%;
    border-radius: 12px;
    margin: 30px 0;
}

.article-content a {
    color: var(--primary);
    text-decoration: none;
}

.article-content a:hover {
    text-decoration: underline;
}

.article-content blockquote {
    border-left: 4px solid var(--primary);
    padding: 16px 24px;
    margin: 24px 0;
    background: var(--bg-light);
    border-radius: 0 12px 12px 0;
    color: var(--text-medium);
}

.article-content code {
    background: var(--bg-light);
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 14px;
}

.article-content pre {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 24px;
    border-radius: 12px;
    overflow-x: auto;
    margin: 24px 0;
}

.article-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 40px auto 0;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .features-grid,
    .articles-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        flex-direction: column;
        padding: 20px;
        gap: 5px;
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }
    
    .nav-links.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-stats {
        gap: 30px;
    }
    
    .stat-number {
        font-size: 24px;
    }
    
    .features-grid,
    .articles-grid,
    .download-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .article-content {
        padding: 30px 20px;
    }
    
    .article-header h1 {
        font-size: 28px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 26px;
    }
    
    .hero-subtitle {
        font-size: 15px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .download-info {
        flex-direction: column;
        gap: 5px;
    }
}