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

:root {
    --primary-bg: #1a1d29;
    --secondary-bg: #252a3a;
    --text-white: #ffffff;
    --text-gray: #a0a5b5;
    --accent-color: #4CAF50;
    --accent-hover: #45a049;
    --border-color: #3d4455;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-white);
    background-color: var(--primary-bg);
}

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

/* 导航栏 */
.navbar {
    background: var(--primary-bg);
    padding: 15px 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.logo-text {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-white);
    text-decoration: none;
}

.logo-desc {
    color: var(--text-gray);
    font-size: 16px;
}

/* Hero区域 */
.hero {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--primary-bg) 0%, #252a3a 100%);
    text-align: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content > p {
    font-size: 18px;
    color: var(--text-gray);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-block;
    border: 2px solid transparent;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.4);
}

.btn-large {
    padding: 18px 45px;
    font-size: 18px;
}

.btn-secondary {
    background: transparent;
    color: var(--text-white);
    border: 2px solid var(--accent-color);
}

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

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

.btn-outline:hover {
    background: var(--border-color);
    transform: translateY(-2px);
}

.btn-small {
    padding: 10px 20px;
    font-size: 14px;
}

/* 数据统计区 */
.stats {
    padding: 80px 0;
    background: var(--secondary-bg);
}

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

.stat-item {
    text-align: center;
    padding: 30px;
    background: var(--primary-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.stat-label {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 5px;
}

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

/* 多链支持模块 */
.multichain {
    padding: 80px 0;
    background: var(--primary-bg);
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
}

.section-header > p {
    color: var(--text-gray);
}

.chain-list {
    margin-bottom: 40px;
}

.chain-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.chain-tag {
    background: var(--secondary-bg);
    padding: 10px 20px;
    border-radius: 8px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.chain-tag:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.security-features {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--secondary-bg);
    padding: 15px 25px;
    border-radius: 8px;
}

.feature-item i {
    color: var(--accent-color);
    font-size: 20px;
}

/* 核心功能区块 */
.features {
    padding: 80px 0;
    background: var(--secondary-bg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: var(--primary-bg);
    padding: 40px 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.feature-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 24px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-gray);
    line-height: 1.6;
}

/* 下载引导区 */
.download-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--accent-color) 0%, #45a049 100%);
    text-align: center;
}

.download-cta h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 30px;
}

.download-buttons {
    margin-bottom: 30px;
    display: flex;
    justify-content: center;
}

.warning-text {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    max-width: 800px;
    margin: 0 auto;
    font-size: 14px;
    line-height: 1.6;
}

.warning-text i {
    font-size: 20px;
    color: #fff3cd;
}

/* 帮助中心 */
.help-center {
    padding: 80px 0;
    background: var(--primary-bg);
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.help-card {
    background: var(--secondary-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.help-card:hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
}

.help-date {
    display: block;
    font-size: 12px;
    color: var(--text-gray);
    margin-bottom: 10px;
}

.help-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 15px;
}

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

/* 常见问题 */
.faq {
    padding: 80px 0;
    background: var(--secondary-bg);
}

.faq-list {
    max-width: 900px;
    margin: 0 auto;
}

.faq-item {
    background: var(--primary-bg);
    border-radius: 8px;
    margin-bottom: 15px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.faq-question {
    padding: 20px 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
}

.faq-question h3 {
    font-size: 16px;
    font-weight: 600;
}

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

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

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

.faq-item.active .faq-answer {
    max-height: 300px;
}

.faq-answer p {
    padding: 0 25px 25px;
    color: var(--text-gray);
    line-height: 1.8;
}

.faq-contact {
    text-align: center;
    margin-top: 30px;
    color: var(--text-gray);
}

/* 联系我们 */
.contact {
    padding: 80px 0;
    background: var(--primary-bg);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 40px;
}

.contact-card {
    background: var(--secondary-bg);
    padding: 40px 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    text-align: center;
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--accent-color);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
}

.contact-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 15px;
}

.contact-card > p {
    color: var(--text-gray);
    margin-bottom: 20px;
}

.contact-address {
    text-align: center;
    color: var(--text-gray);
    line-height: 2;
}

.contact-address p i {
    margin-right: 10px;
    color: var(--accent-color);
}

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

.footer-description {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 40px;
    color: var(--text-gray);
    line-height: 1.8;
}

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

.footer-section h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

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

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

.footer-section a {
    color: var(--text-gray);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: var(--accent-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
    color: var(--text-gray);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 32px;
    }

    .hero-content > p {
        font-size: 16px;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

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

@media (max-width: 480px) {
    .hero {
        padding: 140px 0 80px;
    }

    .hero-content h1 {
        font-size: 28px;
    }

    .stat-number {
        font-size: 36px;
    }
}