:root {
    --primary: #F0B90B;  /* 币安品牌黄 */
    --primary-dark: #D4A306;
    --secondary: #0ecb81;  /* 生态绿 */
    --dark: #121826;     /* 深空背景 */
    --darker: #0A0E17;
    --text: #EAECEF;
    --gray: #76808F;
    --card-bg: rgba(30, 35, 50, 0.7);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background: linear-gradient(135deg, var(--darker) 0%, #1a2236 100%);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 顶部下载注册栏 */
.top-bar {
    background: var(--dark);
    padding: 12px 0;
    border-bottom: 1px solid rgba(240, 185, 11, 0.2);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.top-container {
    display: flex;
    justify-content: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.top-btn {
    margin: 0 10px;
    padding: 12px 25px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    font-size: 0.95rem;
    min-width: 160px;
    justify-content: center;
}

.register-btn {
    background: var(--primary);
    color: var(--dark);
    box-shadow: 0 4px 15px rgba(240, 185, 11, 0.3);
}

.download-btn {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.top-btn i {
    margin-right: 8px;
    font-size: 1.2rem;
}

.top-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(240, 185, 11, 0.4);
}

/* 导航栏 */
.navbar {
    background: rgba(18, 24, 38, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.logo {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary);
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 10px;
}

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

.nav-links li {
    margin-left: 30px;
}

.nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

/* 主横幅 */
.hero {
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(240, 185, 11, 0.05) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--primary), #f8d776);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 40px;
    color: var(--gray);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-top: 30px;
}

.btn {
    display: inline-flex;
    align-items: center;
    padding: 16px 32px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    font-size: 1.1rem;
    border: none;
    min-width: 200px;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    color: var(--dark);
    box-shadow: 0 4px 20px rgba(240, 185, 11, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
}

.btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(240, 185, 11, 0.4);
}

/* 币安APP特色 */
.features {
    padding: 80px 0;
    background: rgba(10, 14, 23, 0.5);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 60px;
    position: relative;
    color: var(--text);
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: var(--primary);
    margin: 15px auto;
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 35px 30px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(240, 185, 11, 0.2);
    border-color: rgba(240, 185, 11, 0.3);
}

.feature-icon {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: var(--primary);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text);
}

/* 购买步骤部分 */
.steps-section {
    padding: 80px 0;
}

.steps-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.step-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 35px 30px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.step-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(240, 185, 11, 0.2);
    border-color: rgba(240, 185, 11, 0.3);
}

.step-number {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(240, 185, 11, 0.1);
}

.step-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--primary);
    display: flex;
    align-items: center;
}

.step-card h3 i {
    margin-right: 10px;
}

/* 交易所注册区域 */
.exchange-section {
    padding: 80px 0;
    background: rgba(10, 14, 23, 0.5);
}

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

.exchange-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.exchange-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.exchange-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 8px 25px rgba(240, 185, 11, 0.2);
}

.exchange-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.binance-icon {
    color: var(--primary);
}

.coinbase-icon {
    color: #0666d0;
}

.kraken-icon {
    color: #5825e0;
}

.okx-icon {
    color: #0ecb81;
}

.exchange-card .btn {
    padding: 10px 20px;
    font-size: 0.9rem;
    margin-top: 15px;
    display: inline-block;
    min-width: 120px;
}

/* 加密货币价格表格 */
.crypto-section {
    padding: 80px 0;
}

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

.prices-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 30px;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
}

.prices-table th {
    background: rgba(240, 185, 11, 0.1);
    padding: 15px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--primary);
}

.prices-table td {
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.green {
    color: var(--secondary);
}

.red {
    color: #ff4d4d;
}
.exchange-icon img{width: 40px;height: 40px;border-radius: 10px;}
.crypto-icon {
    width: 24px;
    height: 24px;
    margin-right: 10px;
    vertical-align: middle;
    display: inline-block;
    font-size: 1.5rem;
}

/* 交易所比较部分 */
.comparison-section {
    padding: 80px 0;
    background: rgba(10, 14, 23, 0.5);
}

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

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 30px;
    background: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
}

.comparison-table th {
    background: rgba(14, 203, 129, 0.1);
    padding: 15px 20px;
    text-align: left;
    font-weight: 600;
    color: var(--secondary);
}

.comparison-table td {
    padding: 15px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.rating {
    color: var(--primary);
}

/* 比特币知识部分 */
.knowledge-section {
    padding: 80px 0;
}

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

.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.knowledge-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.knowledge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(240, 185, 11, 0.1);
}

.knowledge-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--primary);
    display: flex;
    align-items: center;
}

.knowledge-card h3 i {
    margin-right: 10px;
}

/* 常见问题部分 */
.faq-section {
    padding: 80px 0;
    background: rgba(10, 14, 23, 0.8);
    border-top: 1px solid rgba(240, 185, 11, 0.1);
}

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

.faq-item {
    margin-bottom: 25px;
}

.faq-question {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 500;
    transition: var(--transition);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-question i {
    transition: var(--transition);
}

.faq-answer {
    padding: 20px;
    background: rgba(30, 35, 50, 0.5);
    border-radius: 0 0 8px 8px;
    display: none;
}

.faq-item.active .faq-answer {
    display: block;
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

/* 页脚样式 */
footer {
    padding: 60px 0 30px;
    background: var(--dark);
    border-top: 1px solid rgba(240, 185, 11, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.footer-column h3 {
    color: var(--primary);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

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

.footer-column ul li {
    margin-bottom: 12px;
}

.footer-column ul li a {
    color: var(--gray);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--primary);
}

.social-links {
    display: flex;
    gap: 15px;
    margin-top: 20px;
}

.social-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card-bg);
    color: var(--text);
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
    color: var(--darker);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--gray);
    font-size: 0.9rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar{padding: 5px 0}
    .hero h1 {
        font-size: 1rem;
    }
    .prices-table th{font-size: 14px}
    .comparison-table th{font-size: 12px;padding: 5px 10px;}
    .comparison-table td{font-size: 14px;padding: 5px 15px;}
    .section-title {
        font-size: 1.5rem;
    }
    .exchange-card{padding: 15px}
    .top-container {
        flex-wrap: wrap;
    }
.coin_time{text-align: center}
    .top-btn {
        margin: 5px;
        flex: 1 0 40%;
        text-align: center;
        justify-content: center;
        padding: 12px 15px;
        font-size: 0.85rem;
        min-width: auto;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 15px;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .nav-links {
        display: none;
    }

    .prices-table,
    .comparison-table {
        display: block;
        overflow-x: auto;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: 30px;
        padding-bottom: 0;
    }

    .hero h1 {
        font-size: 1rem;
    }

    .hero p {
        font-size: 0.8rem;
    }

    .step-card {
        padding: 25px 20px;
    }

    .top-btn {
        font-size: 0.8rem;
        padding: 10px 12px;
    }
}