/* 易支付开发文档样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
}

.navbar-brand {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-nav li a {
    color: #333;
    font-weight: 500;
    transition: all 0.3s;
    border-radius: 20px;
    padding: 8px 20px;
}

.navbar-nav li a:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
}

.main-container {
    max-width: 1200px;
    margin: 100px auto 50px;
    padding: 0 20px;
}

.hero-section {
    text-align: center;
    color: #fff;
    margin-bottom: 50px;
}

.hero-section h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-section p {
    font-size: 20px;
    opacity: 0.9;
}

.doc-card {
    background: #fff;
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    transition: transform 0.3s, box-shadow 0.3s;
}

.doc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.doc-card h2 {
    font-size: 28px;
    color: #333;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid;
    border-image: linear-gradient(135deg, #667eea, #764ba2) 1;
}

.doc-card h3 {
    font-size: 20px;
    color: #555;
    margin: 25px 0 15px;
}

.doc-card p {
    color: #666;
    line-height: 1.8;
    margin-bottom: 15px;
}

.api-table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
}

.api-table th {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 15px;
    text-align: left;
    font-weight: 600;
}

.api-table th:first-child {
    border-radius: 10px 0 0 0;
}

.api-table th:last-child {
    border-radius: 0 10px 0 0;
}

.api-table td {
    padding: 15px;
    border-bottom: 1px solid #eee;
}

.api-table tr:hover {
    background: #f8f9ff;
}

.api-table code {
    background: #f0f0f0;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: #e83e8c;
}

.code-block {
    background: #1e1e1e;
    border-radius: 10px;
    padding: 20px;
    margin: 15px 0;
    overflow-x: auto;
}

.code-block code {
    color: #d4d4d4;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
}

.code-block .comment {
    color: #6a9955;
}

.code-block .string {
    color: #ce9178;
}

.code-block .keyword {
    color: #569cd6;
}

.sdk-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.sdk-card {
    background: linear-gradient(135deg, #f8f9ff 0%, #fff 100%);
    border: 2px solid #e8e8ff;
    border-radius: 15px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s;
    cursor: pointer;
}

.sdk-card:hover {
    border-color: #667eea;
    transform: scale(1.02);
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
}

.sdk-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 36px;
    color: #fff;
}

.sdk-card h4 {
    font-size: 22px;
    color: #333;
    margin-bottom: 10px;
}

.sdk-card p {
    color: #888;
    font-size: 14px;
    margin-bottom: 20px;
}

.download-btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
    color: #fff;
    text-decoration: none;
}

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: #666;
    border-bottom: 1px solid #f0f0f0;
}

.feature-list li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: bold;
}

.nav-tabs {
    border: none;
    margin-bottom: 30px;
}

.nav-tabs li a {
    border: none;
    background: #f0f0f0;
    color: #666;
    padding: 12px 30px;
    border-radius: 25px;
    margin-right: 10px;
    font-weight: 500;
    transition: all 0.3s;
}

.nav-tabs li.active a,
.nav-tabs li a:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

footer {
    text-align: center;
    padding: 40px;
    color: #fff;
    opacity: 0.8;
}

footer a {
    color: #fff;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .hero-section h1 {
        font-size: 32px;
    }
    
    .hero-section p {
        font-size: 16px;
    }
    
    .doc-card {
        padding: 25px;
    }
    
    .api-table {
        font-size: 12px;
    }
    
    .api-table th, .api-table td {
        padding: 10px;
    }
}