/**
 * BnbGo - 币安深色主题（2026 版）
 * 与前站和管理后台风格完全统一
 */

/* ===== CSS Variables ===== */
:root {
    /* 币安深色主题配色 */
    --color-bg: #1E2329;              /* 主背景 - 币安黑 */
    --color-bg-secondary: #2B3139;    /* 次要背景 */
    --color-bg-tertiary: #373D45;     /* 第三背景 */
    
    --color-primary: #FCD535;         /* 币安黄 - 强调色 */
    --color-primary-hover: #F0B90B;   /* 悬停黄 */
    --color-primary-dark: #D4A90F;    /* 深黄 */
    
    --color-success: #0ECB81;         /* 币安绿 */
    --color-danger: #F6465D;          /* 币安红 */
    --color-warning: #F0B90B;         /* 警告黄 */
    --color-info: #0070F3;            /* 信息蓝 */
    
    --color-text: #EAECEF;            /* 主文字 - 浅灰白 */
    --color-text-secondary: #848E9C;  /* 次要文字 */
    --color-text-disabled: #5E6673;   /* 禁用文字 */
    
    --color-border: #474D57;          /* 边框色 */
    --color-border-light: #2B3139;    /* 浅边框 */
    
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.5);
    
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', '思源黑体', 'Noto Sans SC', sans-serif;
    
    --container-max: 1200px;
    --header-height: 64px;
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

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

/* ===== Header ===== */
.site-header {
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

.logo-text {
    font-size: 24px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.5px;
}

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

.nav-menu a {
    color: var(--color-text-secondary);
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s ease;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
}

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

.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.lang-switch:hover {
    border-color: var(--color-primary);
    background: var(--color-bg-tertiary);
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-primary {
    background: var(--color-primary);
    color: #1E2329;
}

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

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background: var(--color-border);
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

/* ===== Hero Banner ===== */
.hero-banner {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
}

.hero-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
    margin-bottom: 32px;
}

.hero-cta {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 32px;
}

.hero-trust {
    display: flex;
    gap: 24px;
    justify-content: center;
    flex-wrap: wrap;
}

.trust-badge {
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ===== Section ===== */
section {
    padding: 60px 0;
}

.section-title {
    font-size: 32px;
    font-weight: 700;
    color: var(--color-text);
    text-align: center;
    margin-bottom: 48px;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
}

.section-more {
    color: var(--color-primary);
    font-weight: 600;
}

.section-more:hover {
    text-decoration: underline;
}

/* ===== Process Cards ===== */
.process-section {
    background: var(--color-bg-secondary);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.process-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    padding: 32px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: all 0.2s ease;
}

.process-card:hover {
    border-color: var(--color-primary);
    transform: translateY(-4px);
}

.process-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--color-primary);
    opacity: 0.3;
    margin-bottom: 16px;
}

.process-card h3 {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

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

/* ===== News Cards ===== */
.news-section {
    background: var(--color-bg);
}

.news-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.news-card-link {
    display: block;
    text-decoration: none;
    color: inherit;
}

.news-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.2s ease;
    height: 100%;
}

.news-card-link:hover .news-card {
    border-color: var(--color-primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.news-thumbnail {
    width: 100%;
    height: 200px;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.news-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.news-card:hover .news-thumbnail img {
    transform: scale(1.05);
}

.news-content {
    padding: 24px;
}

.news-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.news-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.news-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.news-link {
    color: var(--color-primary);
    font-weight: 600;
}

.news-link:hover {
    text-decoration: underline;
}

/* ===== CTA Section ===== */
.cta-section {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-hover) 100%);
    padding: 80px 0;
}

.cta-content {
    text-align: center;
    color: #1E2329;
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 18px;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-content .btn {
    background: #1E2329;
    color: var(--color-primary);
}

.cta-content .btn:hover {
    background: #2B3139;
}

/* ===== Footer ===== */
.site-footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 48px;
}

.footer-brand .logo-text {
    margin-bottom: 12px;
}

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

.footer-links h4,
.footer-social h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
    text-transform: uppercase;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    font-size: 14px;
    color: var(--color-text-secondary);
}

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

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
    font-size: 14px;
    color: var(--color-text-secondary);
}

/* ===== Floating Telegram ===== */
.floating-telegram {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 56px;
    height: 56px;
    background: #0088cc;
    color: #FFFFFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: var(--shadow-lg);
    transition: all 0.2s ease;
    z-index: 999;
}

.floating-telegram:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 32px rgba(0, 136, 204, 0.4);
}

/* ===== Page Header ===== */
.page-header {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-secondary) 100%);
    text-align: center;
}

.page-header h1 {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
}

.page-header p {
    font-size: 18px;
    color: var(--color-text-secondary);
}

/* ===== Category Filter ===== */
.category-filter {
    display: flex;
    gap: 12px;
    margin-bottom: 32px;
    justify-content: center;
}

.filter-btn {
    padding: 10px 24px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--color-primary);
    color: #1E2329;
    border-color: var(--color-primary);
}

/* ===== News List ===== */
.news-list-section {
    padding: 60px 0;
}

.news-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.news-item-link-all {
    display: block;
    text-decoration: none;
    color: inherit;
    margin-bottom: 24px;
}

.news-item {
    display: flex;
    gap: 24px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.2s ease;
}

.news-item-link-all:hover .news-item {
    border-color: var(--color-primary);
    transform: translateX(4px);
}

.news-item-image {
    width: 280px;
    height: 180px;
    flex-shrink: 0;
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.news-item-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.news-item:hover .news-item-image img {
    transform: scale(1.05);
}

.news-item-content {
    flex: 1;
    padding: 24px;
}

.news-item-category {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.news-item-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
    line-height: 1.4;
}

.news-item-title a:hover {
    color: var(--color-primary);
}

.news-item-excerpt {
    font-size: 14px;
    color: var(--color-text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.news-item-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.news-item-link {
    color: var(--color-primary);
    font-weight: 600;
}

/* ===== Article Content ===== */
.article-content {
    padding: 140px 0 60px;
}

.article-header {
    max-width: 800px;
    margin: 0 auto 40px;
    text-align: center;
}

.article-category {
    display: inline-block;
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 16px;
}

.article-header h1 {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: 24px;
    line-height: 1.3;
}

.article-meta {
    display: flex;
    gap: 24px;
    justify-content: center;
    font-size: 14px;
    color: var(--color-text-secondary);
}

.article-thumbnail {
    width: 100%;
    max-width: 800px;
    margin: 0 auto 40px;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--color-bg-tertiary);
}

.article-thumbnail img {
    width: 100%;
    height: auto;
    min-height: 300px;
    object-fit: cover;
    display: block;
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
}

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

/* 文章内容中的图片优化 */
.article-body img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 24px auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    cursor: pointer;
    transition: transform 0.2s ease;
}

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

/* 文章缩略图 */
.article-thumbnail {
    position: relative;
    cursor: pointer;
    overflow: hidden;
}

.article-thumbnail:hover .image-zoom-hint {
    opacity: 1;
}

.image-zoom-hint {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.7);
    color: #FFFFFF;
    padding: 12px;
    text-align: center;
    font-size: 14px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
}

/* 图片放大查看弹窗 */
.image-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    padding-top: 60px;
    padding-bottom: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.9);
}

.image-modal-content {
    margin: auto;
    display: block;
    max-width: 90%;
    max-height: 80vh;
    object-fit: contain;
    animation: zoom 0.3s ease;
}

@keyframes zoom {
    from {transform: scale(0.8); opacity: 0;}
    to {transform: scale(1); opacity: 1;}
}

.image-modal-caption {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
    text-align: center;
    color: #ccc;
    padding: 10px 0;
    font-size: 16px;
}

.image-modal-close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #f1f1f1;
    font-size: 40px;
    font-weight: bold;
    transition: 0.3s;
    cursor: pointer;
    z-index: 10000;
}

.image-modal-close:hover,
.image-modal-close:focus {
    color: #bbb;
}

.image-modal-content {
    cursor: pointer;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .article-thumbnail img {
        min-height: 200px;
    }
    
    .image-modal-content {
        max-width: 95%;
    }
}

.article-body {
    max-width: 800px;
    margin: 0 auto;
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-text);
}

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

.article-share {
    max-width: 800px;
    margin: 48px auto 32px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
}

.article-share h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 16px;
}

.share-buttons {
    display: flex;
    gap: 12px;
}

.share-btn {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
}

.share-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
    text-decoration: none;
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.share-btn.telegram {
    background: #0088cc;
    color: #FFFFFF;
}

.share-btn.twitter {
    background: #000000;
    color: #FFFFFF;
}

.share-btn.facebook {
    background: #1877F2;
    color: #FFFFFF;
}

.share-btn.linkedin {
    background: #0A66C2;
    color: #FFFFFF;
}

.share-btn.whatsapp {
    background: #25D366;
    color: #FFFFFF;
}

.share-btn.reddit {
    background: #FF4500;
    color: #FFFFFF;
}

.article-back {
    text-align: center;
    margin-top: 48px;
}

/* ===== No Content ===== */
.no-content {
    text-align: center;
    padding: 80px 24px;
    color: var(--color-text-secondary);
    font-size: 16px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .process-grid,
    .news-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-title {
        font-size: 32px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .process-grid,
    .news-grid {
        grid-template-columns: 1fr;
    }
    
    .news-item {
        flex-direction: column;
    }
    
    .news-item-image {
        width: 100%;
        height: 200px;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}