/* common.css */
/* ====== 基础样式 ====== */
:root {
    --primary: #1e50ff;
    --secondary: #00d6ff;
    --dark: #0f172a;
    --light: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-700: #334155;
    --gray-900: #0f172a;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--light);
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ====== 导航栏 ====== */
header {
    background: white;
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: bold;
    font-size: 24px;
    color: var(--dark);
}

.nav-menu {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    color: var(--gray-700);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
}

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

.nav-link.active {
    color: var(--primary);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
}

.btn {
    padding: 10px 24px;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    display: inline-block;
}

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

.btn-primary:hover {
    background: #1a46e6;
}

/* ====== 面包屑导航 ====== */
.breadcrumb {
    background: var(--gray-100);
    padding: 20px 0;
    margin-top: 70px;
}

.breadcrumb-container {
    display: flex;
    align-items: center;
    gap: 10px;
}

.breadcrumb-link {
    color: var(--primary);
    text-decoration: none;
}

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

.breadcrumb-separator {
    color: var(--gray-700);
}

.breadcrumb-current {
    color: var(--gray-700);
    font-weight: 500;
}

/* ====== 主内容区域 ====== */
.content-section {
    min-height: 500px;
    padding: 60px 0;
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--dark);
}

.page-description {
    color: var(--gray-700);
    font-size: 1.1rem;
    margin-bottom: 40px;
}

.content-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 40px;
    box-shadow: var(--shadow);
    margin-bottom: 30px;
}

.content-card h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.content-card h3 {
    font-size: 1.4rem;
    margin: 25px 0 15px;
    color: var(--gray-900);
}

.content-card p {
    color: var(--gray-700);
    margin-bottom: 15px;
    line-height: 1.7;
}

.content-card ul, .content-card ol {
    margin-left: 25px;
    margin-bottom: 25px;
}

.content-card li {
    color: var(--gray-700);
    margin-bottom: 10px;
    line-height: 1.6;
}

.keyword {
    background: rgba(30, 80, 255, 0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-weight: 500;
}

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

/* ====== 特色网格 ====== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.feature-card {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 30px;
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

/* ====== 下载区块 ====== */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.download-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    border: 1px solid var(--gray-200);
    transition: all 0.3s;
}

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

.download-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

/* ====== 交易表格 ====== */
.trading-table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: white;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
}

.trading-table th {
    background: var(--dark);
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.trading-table td {
    padding: 15px;
    border-bottom: 1px solid var(--gray-200);
}

.trading-table tr:hover {
    background: var(--gray-100);
}

/* ====== 注册步骤 ====== */
.register-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.step-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    text-align: center;
    border: 1px solid var(--gray-200);
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 24px;
    font-weight: bold;
}

/* ====== 钱包功能 ====== */
.wallet-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 40px 0;
}

.wallet-feature {
    background: white;
    border-radius: var(--radius-lg);
    padding: 25px;
    border: 1px solid var(--gray-200);
}

/* ====== 内部链接区 ====== */
.internal-links {
    background: var(--gray-100);
    padding: 60px 0;
    margin-top: 60px;
}

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

.link-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.link-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.link-card h3 {
    margin-bottom: 15px;
    color: var(--dark);
}

.link-card a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.link-card a:hover {
    text-decoration: underline;
}

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

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

.footer-column h3 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: white;
}

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

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

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ====== 响应式设计 ====== */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 30px;
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .mobile-menu-btn {
        display: block;
        background: none;
        border: none;
        font-size: 24px;
        color: var(--gray-700);
        cursor: pointer;
    }
    
    .page-title {
        font-size: 2rem;
    }
    
    .content-card {
        padding: 25px 20px;
    }
}

@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none;
    }
}