/* ===== GitBook-style Documentation Center ===== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@300;400;500;700;900&family=JetBrains+Mono:wght@400;500&display=swap');

/* ---------- Dark Theme (default) ---------- */
:root,
[data-theme="dark"] {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-sidebar: #0e0e0e;
    --bg-card: #161616;
    --bg-hover: #1c1c1c;
    --bg-code: rgba(255, 255, 255, 0.06);
    --bg-blockquote: rgba(0, 200, 83, 0.05);
    --bg-table-head: rgba(0, 200, 83, 0.08);
    --bg-table-hover: rgba(255, 255, 255, 0.02);
    --bg-nav-active: rgba(0, 200, 83, 0.1);
    --bg-search: #1a1a1a;
    --border: #252525;
    --border-light: rgba(255, 255, 255, 0.06);
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --text-code: #00e676;
    --green: #00C853;
    --green-dark: #00a344;
    --green-light: #00e676;
    --green-glow: rgba(0, 200, 83, 0.15);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --scrollbar-track: #0a0a0a;
    --scrollbar-thumb: #333;
    --toggle-icon: "🌙";
}

/* ---------- Light Theme ---------- */
[data-theme="light"] {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-sidebar: #f5f6f7;
    --bg-card: #ffffff;
    --bg-hover: #f0f1f2;
    --bg-code: rgba(0, 0, 0, 0.05);
    --bg-blockquote: rgba(0, 200, 83, 0.06);
    --bg-table-head: rgba(0, 200, 83, 0.06);
    --bg-table-hover: rgba(0, 0, 0, 0.02);
    --bg-nav-active: rgba(0, 200, 83, 0.1);
    --bg-search: #eee;
    --border: #e0e0e0;
    --border-light: rgba(0, 0, 0, 0.08);
    --text-primary: #1a1a1a;
    --text-secondary: #444444;
    --text-muted: #888888;
    --text-code: #00873e;
    --green: #00873e;
    --green-dark: #006830;
    --green-light: #00a344;
    --green-glow: rgba(0, 135, 62, 0.12);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
    --scrollbar-track: #f5f5f5;
    --scrollbar-thumb: #ccc;
    --toggle-icon: "☀️";
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Noto Sans SC', 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.8;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
}

::selection {
    background: var(--green-glow);
    color: var(--text-primary);
}

/* ===== Layout ===== */
.docs-layout {
    display: flex;
    min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 280px;
    min-width: 280px;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 100;
    transition: transform 0.3s ease, background 0.3s;
}

.sidebar-header {
    padding: 20px 20px 16px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header .logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 800;
    font-size: 1.1rem;
}

.sidebar-header .logo .green {
    color: var(--green);
}

.sidebar-header .back-link {
    display: block;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s;
}

.sidebar-header .back-link:hover {
    color: var(--green);
}

.sidebar-header .theme-toggle {
    position: absolute;
    top: 20px;
    right: 16px;
    background: var(--bg-code);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    color: var(--text-primary);
}

.sidebar-header .theme-toggle:hover {
    background: var(--green-glow);
    border-color: var(--green);
}

/* Search */
.sidebar-search {
    padding: 12px 16px;
}

.sidebar-search input {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-search);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s;
}

.sidebar-search input::placeholder {
    color: var(--text-muted);
}

.sidebar-search input:focus {
    border-color: var(--green);
}

/* Nav */
.sidebar-nav {
    padding: 8px 0;
}

.nav-group {
    margin-bottom: 4px;
}

.nav-group-title {
    padding: 8px 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    cursor: default;
}

.nav-item {
    display: block;
    padding: 7px 20px 7px 28px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-left: 3px solid transparent;
    transition: all 0.15s;
    cursor: pointer;
    line-height: 1.5;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--bg-nav-active);
    color: var(--green);
    border-left-color: var(--green);
    font-weight: 600;
}

/* ===== Main Content ===== */
.docs-main {
    flex: 1;
    margin-left: 280px;
    min-width: 0;
}

.docs-content {
    max-width: 860px;
    margin: 0 auto;
    padding: 40px 48px 80px;
}

/* ===== Content Typography ===== */
.doc-section {
    display: none;
}

.doc-section.active {
    display: block;
}

.docs-content h1 {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 8px;
    line-height: 1.3;
    background: linear-gradient(135deg, var(--text-primary) 60%, var(--text-muted));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.docs-content .doc-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-bottom: 32px;
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.docs-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin: 40px 0 16px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border);
    color: var(--text-primary);
}

.docs-content h3 {
    font-size: 1.08rem;
    font-weight: 700;
    margin: 28px 0 10px;
    color: var(--green);
}

.docs-content h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin: 20px 0 8px;
    color: var(--text-secondary);
}

.docs-content p {
    color: var(--text-secondary);
    margin-bottom: 14px;
    line-height: 1.9;
}

.docs-content ul,
.docs-content ol {
    color: var(--text-secondary);
    margin: 0 0 14px 20px;
    line-height: 1.9;
}

.docs-content li {
    margin-bottom: 4px;
}

.docs-content strong {
    color: var(--text-primary);
}

.docs-content a {
    color: var(--green);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: border-color 0.2s;
}

.docs-content a:hover {
    border-bottom-color: var(--green);
}

/* Blockquote */
.docs-content blockquote {
    border-left: 3px solid var(--green);
    background: var(--bg-blockquote);
    padding: 12px 20px;
    margin: 14px 0;
    border-radius: 0 8px 8px 0;
    color: var(--text-secondary);
    font-size: 0.92rem;
}

/* Tables */
.table-wrap {
    overflow-x: auto;
    margin: 14px 0;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.docs-content table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.87rem;
}

.docs-content thead {
    background: var(--bg-table-head);
}

.docs-content th {
    text-align: left;
    padding: 10px 14px;
    font-weight: 600;
    color: var(--green);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

.docs-content td {
    padding: 9px 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-light);
    vertical-align: top;
}

.docs-content tbody tr:hover {
    background: var(--bg-table-hover);
}

/* Code */
.docs-content code {
    background: var(--bg-code);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.84em;
    color: var(--text-code);
    font-family: 'JetBrains Mono', monospace;
}

.docs-content pre {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px 20px;
    margin: 14px 0;
    overflow-x: auto;
    font-size: 0.83rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.docs-content pre code {
    background: none;
    padding: 0;
    color: inherit;
}

/* HR */
.docs-content hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 36px 0;
}

/* ===== Warning Boxes ===== */
.warning-box {
    padding: 12px 16px;
    background: rgba(255, 152, 0, 0.08);
    border: 1px solid rgba(255, 152, 0, 0.25);
    border-radius: 8px;
    margin: 14px 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ===== Mobile ===== */
.sidebar-toggle {
    display: none;
    position: fixed;
    top: 12px;
    left: 12px;
    z-index: 200;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    width: 40px;
    height: 40px;
    cursor: pointer;
    font-size: 1.2rem;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
}

.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 90;
    background: rgba(0, 0, 0, 0.5);
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        width: 280px;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-toggle {
        display: flex;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .docs-main {
        margin-left: 0;
    }

    .docs-content {
        padding: 60px 16px 60px;
    }

    .docs-content h1 {
        font-size: 1.5rem;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ===== Page progress ===== */
.reading-progress {
    position: fixed;
    top: 0;
    left: 280px;
    right: 0;
    height: 2px;
    background: var(--border);
    z-index: 50;
}

.reading-progress .bar {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--green), var(--green-light));
    transition: width 0.1s;
}

@media (max-width: 768px) {
    .reading-progress {
        left: 0;
    }
}