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

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --accent-color: #3b82f6;
    --text-color: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

.navbar {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.nav-brand h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.nav-brand .tagline {
    font-size: 0.875rem;
    color: var(--text-light);
    display: block;
    margin-top: 0.25rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 0.25rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-color);
    transition: 0.3s;
}

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: #fff;
    padding: 4rem 0;
}

.hero-content {
    text-align: center;
    margin-bottom: 3rem;
}

.hero-content h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 2rem;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 500;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background: var(--bg-light);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-secondary {
    background: transparent;
    color: #fff;
    border: 2px solid #fff;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.hero-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: 0.5rem;
    text-align: center;
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.875rem;
    opacity: 0.9;
}

.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 3rem;
    color: var(--text-color);
}

.bg-light {
    background: var(--bg-light);
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card {
    background: #fff;
    padding: 1.5rem;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.card p {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.card ul {
    list-style: none;
    padding-left: 0;
}

.card ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-light);
}

.card ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.step-number {
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content h3 {
    margin-bottom: 0.5rem;
}

.step-content p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.tech-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.tech-item {
    text-align: center;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
}

.tech-item h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.tech-item p {
    color: var(--text-light);
}

.api-layout,
.docs-layout,
.features-layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 2rem;
    padding: 2rem 0;
    min-height: calc(100vh - 80px);
}

.api-sidebar,
.docs-sidebar,
.features-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
    max-height: calc(100vh - 120px);
    overflow-y: auto;
}

.sidebar-section {
    margin-bottom: 1.5rem;
}

.sidebar-section:last-child {
    margin-bottom: 0;
}

.sidebar-section h3 {
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

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

.sidebar-section ul li {
    margin-bottom: 0.5rem;
}

.sidebar-section ul li a {
    color: var(--text-light);
    text-decoration: none;
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    transition: all 0.3s;
    font-size: 0.875rem;
}

.sidebar-section ul li a:hover {
    background: var(--primary-color);
    color: #fff;
}

.api-content,
.docs-content,
.features-content {
    padding: 1rem 0;
}

.page-title {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.page-intro {
    color: var(--text-light);
    margin-bottom: 2rem;
    font-size: 1.125rem;
}

.api-intro {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 2rem;
}

.api-base-url {
    margin-top: 1rem;
    padding: 1rem;
    background: #fff;
    border-radius: 0.25rem;
    border-left: 4px solid var(--primary-color);
}

.api-base-url code {
    background: var(--bg-light);
    padding: 0.25rem 0.5rem;
    border-radius: 0.25rem;
    font-family: 'Courier New', monospace;
}

.api-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.api-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.api-section h3 {
    font-size: 1.125rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

.api-method {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 1rem 0;
}

.method {
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
    font-weight: bold;
    font-size: 0.875rem;
    text-transform: uppercase;
}

.method.get {
    background: var(--success-color);
    color: #fff;
}

.method.post {
    background: var(--primary-color);
    color: #fff;
}

.method.put {
    background: var(--warning-color);
    color: #fff;
}

.method.delete {
    background: var(--error-color);
    color: #fff;
}

.endpoint {
    font-family: 'Courier New', monospace;
    background: var(--bg-light);
    padding: 0.25rem 0.75rem;
    border-radius: 0.25rem;
}

.api-table,
.docs-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}

.api-table th,
.api-table td,
.docs-table th,
.docs-table td {
    padding: 0.75rem;
    text-align: left;
    border: 1px solid var(--border-color);
}

.api-table th,
.docs-table th {
    background: var(--bg-light);
    font-weight: 600;
}

.api-table tr:hover,
.docs-table tr:hover {
    background: var(--bg-light);
}

.code-block {
    background: #1f2937;
    color: #fff;
    padding: 1.5rem;
    border-radius: 0.5rem;
    overflow-x: auto;
    margin: 1rem 0;
}

.code-block pre {
    margin: 0;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
}

.code-block code {
    color: #e5e7eb;
}

.docs-section {
    margin-bottom: 3rem;
}

.docs-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.docs-section h3 {
    font-size: 1.125rem;
    margin: 1.5rem 0 0.75rem;
    color: var(--text-color);
}

.requirement-list ul,
.docs-section ul {
    list-style: none;
    padding-left: 0;
}

.requirement-list li,
.docs-section ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
}

.requirement-list li:before,
.docs-section ul li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

.docs-section ol {
    padding-left: 1.5rem;
}

.docs-section ol li {
    padding: 0.5rem 0;
}

.faq-item {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.faq-item h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.faq-item p {
    color: var(--text-light);
}

.feature-section {
    margin-bottom: 3rem;
    padding: 2rem;
    background: #fff;
    border-radius: 0.5rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.feature-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
}

.feature-description {
    margin-bottom: 2rem;
}

.feature-description p {
    color: var(--text-light);
    font-size: 1.125rem;
}

.feature-details h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.feature-item {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
}

.feature-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.feature-item p {
    color: var(--text-light);
    font-size: 0.875rem;
}

.feature-docs {
    background: var(--bg-light);
    padding: 1.5rem;
    border-radius: 0.5rem;
}

.feature-docs h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

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

.feature-docs ul li {
    margin-bottom: 0.5rem;
}

.feature-docs ul li a {
    color: var(--primary-color);
    text-decoration: none;
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.25rem;
    transition: all 0.3s;
    font-size: 0.875rem;
}

.feature-docs ul li a:hover {
    background: var(--primary-color);
    color: #fff;
}

.contact-page {
    padding: 2rem 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.contact-info h2,
.contact-form-section h2,
.faq-section h2 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-light);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
}

.contact-icon {
    font-size: 2rem;
}

.contact-details h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

.contact-details p {
    color: var(--text-light);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 0.25rem;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer {
    background: #1f2937;
    color: #fff;
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

.footer-section h3 {
    font-size: 1.25rem;
}

.footer-section h4 {
    font-size: 1rem;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #fff;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #374151;
    color: #9ca3af;
}

@media (max-width: 768px) {
    .navbar .container {
        flex-wrap: wrap;
    }

    .nav-menu {
        display: none;
        width: 100%;
        flex-direction: column;
        gap: 0;
        padding-top: 1rem;
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        padding: 0.5rem 0;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-content h1 {
        font-size: 1.75rem;
    }

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

    .api-layout,
    .docs-layout,
    .features-layout {
        grid-template-columns: 1fr;
    }

    .api-sidebar,
    .docs-sidebar,
    .features-sidebar {
        position: static;
        max-height: none;
        margin-bottom: 1rem;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

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

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

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

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

@media (max-width: 480px) {
    .hero-content h1 {
        font-size: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .page-title {
        font-size: 1.5rem;
    }

    .api-section,
    .feature-section {
        padding: 1rem;
    }
}