:root {
    --bg: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --accent: #2563eb;
    --accent-dim: rgba(37,99,235,0.08);
    --accent-hover: #1d4ed8;
    --text: #1e293b;
    --text-sec: #475569;
    --muted: #94a3b8;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --code-bg: #f1f5f9;
    --sidebar-w: 260px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 15px;
    line-height: 1.7;
}

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

/* ===== SIDEBAR / TOC ===== */
.doc-sidebar {
    width: var(--sidebar-w);
    background: var(--surface);
    border-right: 1px solid var(--border);
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
    z-index: 50;
    padding-bottom: 40px;
}

.doc-sidebar-header {
    padding: 24px 20px 16px;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    background: var(--surface);
    z-index: 2;
}

.doc-sidebar-header h1 {
    font-size: 16px;
    font-weight: 800;
    color: var(--accent);
}

.doc-sidebar-header p {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--muted);
    margin-top: 2px;
}

.toc {
    padding: 12px 10px;
}

.toc-group {
    margin-bottom: 8px;
}

.toc-group-label {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--muted);
    font-weight: 700;
    padding: 10px 12px 4px;
}

.toc a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 6px;
    color: var(--text-sec);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    transition: all 0.12s;
}

.toc a:hover,
.toc a.active {
    background: var(--accent-dim);
    color: var(--accent);
}

.toc-icon {
    font-size: 15px;
    width: 22px;
    text-align: center;
    flex-shrink: 0;
}

/* ===== MAIN CONTENT ===== */
.doc-main {
    flex: 1;
    margin-left: var(--sidebar-w);
    max-width: 820px;
    padding: 40px 48px 80px;
}

/* ===== HERO ===== */
.hero {
    text-align: center;
    padding: 48px 20px 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border);
}

.hero-logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: var(--accent);
    color: #fff;
    border-radius: 18px;
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 1px;
    margin-bottom: 16px;
}

.hero h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 4px;
}

.hero p {
    font-size: 16px;
    color: var(--muted);
}

.hero-meta {
    margin-top: 20px;
    font-size: 12px;
    color: var(--muted);
}

/* ===== SECTIONS ===== */
.doc-section {
    margin-bottom: 48px;
    scroll-margin-top: 24px;
}

.doc-section h2 {
    font-size: 24px;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 8px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--accent);
    display: flex;
    align-items: center;
    gap: 10px;
}

.doc-section h2 .sec-icon {
    font-size: 24px;
}

.doc-section h3 {
    font-size: 17px;
    font-weight: 700;
    color: var(--text);
    margin: 24px 0 10px;
}

.doc-section p {
    margin-bottom: 12px;
    color: var(--text-sec);
}

/* ===== STEPS ===== */
.steps {
    counter-reset: step;
    margin: 16px 0;
}

.step {
    counter-increment: step;
    position: relative;
    padding: 16px 16px 16px 56px;
    margin-bottom: 12px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    transition: box-shadow 0.15s;
}

.step:hover {
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.step::before {
    content: counter(step);
    position: absolute;
    left: 16px;
    top: 16px;
    width: 28px;
    height: 28px;
    background: var(--accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}

.step-title {
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.step p {
    margin-bottom: 6px;
    font-size: 14px;
}

/* ===== MOCKUP UI ===== */
.mockup {
    background: #0f172a;
    border-radius: 10px;
    padding: 20px;
    margin: 16px 0;
    overflow: hidden;
    border: 1px solid #334155;
}

.mockup-light {
    background: var(--surface);
    border-color: var(--border);
}

.mockup-title {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #94a3b8;
    margin-bottom: 12px;
    font-weight: 600;
}

.mockup-bar {
    display: flex;
    gap: 6px;
    margin-bottom: 14px;
}

.mockup-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.mockup-dot.r { background: #ef4444; }
.mockup-dot.y { background: #f59e0b; }
.mockup-dot.g { background: #10b981; }

.mockup-btn {
    display: inline-block;
    padding: 6px 14px;
    background: var(--accent);
    color: #fff;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
}

.mockup-input {
    display: inline-block;
    padding: 6px 12px;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 6px;
    color: #94a3b8;
    font-size: 12px;
    min-width: 200px;
}

.mockup-light .mockup-input {
    background: var(--code-bg);
    border-color: var(--border);
    color: var(--text-sec);
}

.mockup-table {
    width: 100%;
    font-size: 12px;
    border-collapse: collapse;
}

.mockup-table th {
    text-align: left;
    padding: 6px 10px;
    color: #94a3b8;
    border-bottom: 1px solid #334155;
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.mockup-light .mockup-table th {
    color: var(--muted);
    border-color: var(--border);
}

.mockup-table td {
    padding: 8px 10px;
    color: #e2e8f0;
    border-bottom: 1px solid rgba(51,65,85,0.5);
}

.mockup-light .mockup-table td {
    color: var(--text-sec);
    border-color: var(--border);
}

.mockup-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
}

.badge-green { background: rgba(16,185,129,0.15); color: #10b981; }
.badge-blue { background: rgba(37,99,235,0.15); color: #60a5fa; }
.badge-amber { background: rgba(245,158,11,0.15); color: #f59e0b; }
.badge-red { background: rgba(239,68,68,0.15); color: #ef4444; }
.badge-gray { background: rgba(148,163,184,0.15); color: #94a3b8; }

/* ===== CALLOUTS ===== */
.callout {
    padding: 14px 16px;
    border-radius: 8px;
    margin: 16px 0;
    font-size: 14px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.callout-icon {
    font-size: 18px;
    flex-shrink: 0;
    line-height: 1.4;
}

.callout-info {
    background: var(--accent-dim);
    border: 1px solid rgba(37,99,235,0.15);
    color: var(--text-sec);
}

.callout-tip {
    background: rgba(16,185,129,0.06);
    border: 1px solid rgba(16,185,129,0.15);
    color: var(--text-sec);
}

.callout-warn {
    background: rgba(245,158,11,0.06);
    border: 1px solid rgba(245,158,11,0.15);
    color: var(--text-sec);
}

/* ===== PERMISSION TABLE ===== */
.perm-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
    margin: 12px 0;
}

.perm-table th {
    text-align: left;
    padding: 8px 12px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    font-weight: 700;
    font-size: 12px;
    color: var(--text-sec);
}

.perm-table td {
    padding: 8px 12px;
    border: 1px solid var(--border);
    color: var(--text-sec);
}

.perm-table tr:hover td {
    background: var(--accent-dim);
}

/* ===== FAQ ===== */
.faq-item {
    margin-bottom: 16px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
}

.faq-q {
    padding: 14px 16px;
    font-weight: 700;
    color: var(--text);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-q:hover {
    background: var(--accent-dim);
}

.faq-q::after {
    content: '+';
    font-size: 18px;
    color: var(--muted);
    transition: transform 0.2s;
}

.faq-item.open .faq-q::after {
    transform: rotate(45deg);
}

.faq-a {
    display: none;
    padding: 0 16px 14px;
    color: var(--text-sec);
    font-size: 14px;
    line-height: 1.6;
}

.faq-item.open .faq-a {
    display: block;
}

/* ===== KEYBOARD SHORTCUT ===== */
kbd {
    display: inline-block;
    padding: 2px 6px;
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 12px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--text-sec);
    box-shadow: 0 1px 0 var(--border);
}

/* ===== FLOW DIAGRAM ===== */
.flow {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
    margin: 16px 0;
    padding: 16px;
    background: var(--code-bg);
    border-radius: 8px;
}

.flow-step {
    padding: 8px 14px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-sec);
    white-space: nowrap;
}

.flow-step.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.flow-arrow {
    color: var(--muted);
    font-size: 16px;
    padding: 0 2px;
}

/* ===== PRINT ===== */
@media print {
    .doc-sidebar { display: none; }
    .doc-main { margin-left: 0; max-width: 100%; padding: 20px; }
    .mockup { break-inside: avoid; }
    .step { break-inside: avoid; }
    .doc-section { break-before: auto; }
    body { font-size: 12px; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .doc-sidebar { display: none; }
    .doc-main { margin-left: 0; padding: 20px; }
}

/* ===== SCROLL BEHAVIOR ===== */
html {
    scroll-behavior: smooth;
}