:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #10b981;
    --dark-color: #1e293b;
    --light-color: #f8fafc;
    --gray-color: #94a3b8;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --transition: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    background-color: #f1f5f9;
    background-image: linear-gradient(to bottom right, #f8fafc, #e2e8f0);
}

.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 1.5rem 2rem;
    border-bottom: 4px solid var(--secondary-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.logo img {
    height: 50px;
    width: auto;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo span {
    font-size: 1rem;
    font-weight: 400;
    opacity: 0.9;
}

.intro p {
    max-width: 800px;
    opacity: 0.9;
    font-size: 0.95rem;
}

.main-content {
    display: flex;
    flex: 1;
}

.sidebar {
    width: 280px;
    background-color: white;
    border-right: 1px solid #e2e8f0;
    padding: 1.5rem 0;
    transition: var(--transition);
}

.content-area {
    flex: 1;
    padding: 2rem;
    background-color: white;
    margin: 1rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.nav-menu {
    width: 100%;
}

.nav-primary {
    list-style: none;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    color: var(--dark-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-link:hover {
    background-color: #f1f5f9;
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.nav-link.active {
    background-color: #e0e7ff;
    color: var(--primary-color);
    border-left: 3px solid var(--primary-color);
}

.nav-link i {
    margin-right: 0.75rem;
    width: 20px;
    text-align: center;
}

.nav-link .arrow {
    transition: var(--transition);
}

.nav-link.active .arrow {
    transform: rotate(90deg);
}

.nav-secondary {
    list-style: none;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    background-color: #f8fafc;
}

.nav-secondary.show {
    max-height: 500px;
}

.nav-secondary .nav-link {
    padding-left: 2.5rem;
    font-size: 0.9rem;
    font-weight: 400;
}

.nav-secondary .nav-link:hover {
    background-color: #e2e8f0;
}

.welcome-message {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--dark-color);
}

.welcome-message h2 {
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-size: 1.8rem;
}

.welcome-message p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--gray-color);
}

.tech-animation {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.circle {
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: var(--primary-color);
    animation: pulse 1.5s infinite ease-in-out;
}

.circle:nth-child(2) {
    animation-delay: 0.3s;
    background-color: var(--secondary-color);
}

.circle:nth-child(3) {
    animation-delay: 0.6s;
    background-color: #f59e0b;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.2);
        opacity: 1;
    }
}

.document-content {
    display: none;
}

.footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--dark-color);
    color: white;
    font-size: 0.85rem;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        padding: 1rem 0;
    }

    .content-area {
        margin: 0;
        border-radius: 0;
    }

    .nav-link {
        padding: 0.75rem 1rem;
    }

    .nav-secondary .nav-link {
        padding-left: 1.75rem;
    }
}

/* 文档内容样式 */
.document-content h2 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid #e2e8f0;
}

.document-content h3 {
    color: var(--dark-color);
    margin: 1.5rem 0 1rem;
}

.document-content p {
    margin-bottom: 1rem;
    line-height: 1.7;
}

.document-content ul, .document-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.document-content li {
    margin-bottom: 0.5rem;
}

.document-content pre {
    background-color: #f8fafc;
    padding: 1rem;
    border-radius: var(--border-radius);
    overflow-x: auto;
    margin-bottom: 1.5rem;
    border-left: 3px solid var(--primary-color);
}

.document-content code {
    font-family: 'Courier New', Courier, monospace;
    background-color: #f1f5f9;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    font-size: 0.9rem;
}

.document-content .note {
    background-color: #e0f2fe;
    padding: 1rem;
    border-left: 4px solid var(--primary-color);
    margin: 1.5rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.document-content .warning {
    background-color: #fef3c7;
    padding: 1rem;
    border-left: 4px solid #f59e0b;
    margin: 1.5rem 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}