:root {
    /* Light Theme */
    --bg-app: #ffffff;
    --bg-sidebar: #f8f9fa;
    --bg-card: #ffffff;
    --bg-code: #f1f3f5;
    --border: #e9ecef;
    --text-main: #212529;
    --text-muted: #6c757d;
    --primary: #3b82f6;
    --primary-light: #dbeafe;
    --accent: #6366f1;
    --header-height: 64px;
    --sidebar-width: 260px;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --bg-app: #0f172a;
    --bg-sidebar: #1e293b;
    --bg-card: #1e293b;
    --bg-code: #334155;
    --border: #334155;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #60a5fa;
    --primary-light: #1e3a8a;
    --accent: #818cf8;
}

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

body {
    font-family: 'Inter', 'Noto Sans SC', sans-serif;
    background-color: var(--bg-app);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    position: fixed;
    display: flex;
    flex-direction: column;
    z-index: 1000;
    transition: transform 0.3s ease, background-color 0.3s;
}

.main-wrapper {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* Sidebar Styling */
.sidebar-header {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--primary);
}

.logo i {
    font-size: 1.5rem;
}

.nav-links {
    list-style: none;
    padding: 0 12px;
    flex: 1;
}

.nav-links li {
    margin-bottom: 4px;
}

.nav-links a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    text-decoration: none;
    color: var(--text-muted);
    border-radius: 8px;
    font-weight: 500;
    transition: var(--transition);
}

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

.sidebar-footer {
    padding: 24px;
    border-top: 1px solid var(--border);
}

.sidebar-footer a {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Header */
.header {
    height: var(--header-height);
    padding: 0 40px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    position: sticky;
    top: 0;
    background-color: rgba(var(--bg-app), 0.8);
    backdrop-filter: blur(8px);
    z-index: 100;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.theme-toggle {
    background: none;
    border: 1px solid var(--border);
    width: 40px;
    height: 40px;
    border-radius: 10px;
    cursor: pointer;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.theme-toggle:hover {
    background-color: var(--bg-sidebar);
}

.theme-icon-dark { display: none; }
[data-theme="dark"] .theme-icon-light { display: none; }
[data-theme="dark"] .theme-icon-dark { display: block; }

/* Content Sections */
.content {
    padding: 0 40px 80px;
    max-width: 900px;
    margin: 0 auto;
}

section {
    padding-top: 80px;
    margin-bottom: 40px;
}

h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.2;
}

h2 {
    font-size: 2rem;
    margin-bottom: 2rem;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary-light);
}

h3 {
    margin-bottom: 1rem;
}

.hero-section {
    padding-top: 60px;
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
}

.command-box {
    background-color: var(--bg-code);
    padding: 16px 24px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    gap: 16px;
    font-family: monospace;
    border: 1px solid var(--border);
}

.copy-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary);
    font-size: 1.2rem;
}

/* Cards */
.concept-card {
    display: flex;
    gap: 24px;
    background-color: var(--bg-sidebar);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--border);
}

.concept-icon {
    font-size: 2.5rem;
    color: var(--primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.feature-card {
    background-color: var(--bg-app);
    border: 1px solid var(--border);
    padding: 24px;
    border-radius: 16px;
    transition: var(--transition);
}

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

.feature-card i {
    font-size: 2rem;
    color: var(--primary);
    margin-bottom: 16px;
    display: block;
}

/* Tabs */
.tabs {
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.tab-header {
    display: flex;
    background-color: var(--bg-sidebar);
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    padding: 12px 24px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-muted);
    font-weight: 600;
    transition: var(--transition);
}

.tab-btn.active {
    color: var(--primary);
    border-bottom: 2px solid var(--primary);
}

.tab-content {
    padding: 24px;
    display: none;
}

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

pre {
    background-color: var(--bg-code);
    padding: 16px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 16px 0;
}

/* Config Grid */
.config-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.config-item {
    background-color: var(--bg-sidebar);
    padding: 24px;
    border-radius: 16px;
}

.tip {
    margin-top: 12px;
    font-size: 0.9rem;
    color: var(--accent);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
}

th, td {
    text-align: left;
    padding: 12px;
    border-bottom: 1px solid var(--border);
}

th {
    background-color: var(--bg-sidebar);
    font-weight: 600;
}

/* Advanced */
.adv-card {
    display: flex;
    gap: 20px;
    padding: 20px;
    border-radius: 12px;
    background-color: var(--bg-sidebar);
    margin-bottom: 16px;
}

.adv-icon {
    font-size: 1.5rem;
    color: var(--accent);
}

/* Footer */
.footer {
    padding: 40px;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Mobile */
.mobile-menu-toggle, .mobile-close {
    display: none;
}

@media (max-width: 1024px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-wrapper {
        margin-left: 0;
    }
    .mobile-menu-toggle {
        display: flex;
        background: none;
        border: 1px solid var(--border);
        width: 40px;
        height: 40px;
        border-radius: 10px;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        color: var(--text-main);
        position: absolute;
        left: 20px;
    }
    .mobile-close {
        display: block;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: var(--text-muted);
        cursor: pointer;
    }
    .header {
        padding: 0 20px;
    }
    .content {
        padding: 0 20px 40px;
    }
    h1 {
        font-size: 2.25rem;
    }
    .config-grid {
        grid-template-columns: 1fr;
    }
}