:root {
  --accent:  #1a56db;
  --accent-p:rgba(26,86,219,.08);
  --border-c:#e5e7eb;
  --ink:     #ffffff;
  --surface: #f9fafb;
  --card:    #ffffff;
  --border:  #e5e7eb;
  --text:    #111827;
  --muted:   #6b7280;
  --green:   #059669;
  --red:     #dc2626;
  --blue:    #2563eb;
  --sidebar: 260px;
}

*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; font-size:15px; }
body {
  font-family:'Sarabun',sans-serif;
  background:#f3f4f6;
  color:var(--text);
  display:flex;
  min-height:100vh;
  line-height:1.75;
}

/* ── SIDEBAR ── */
.sidebar {
  width:var(--sidebar);
  background:#ffffff;
  border-right:1px solid var(--border-c);
  position:fixed; top:0; left:0; height:100vh;
  overflow-y:auto; z-index:50;
  display:flex; flex-direction:column;
  box-shadow:1px 0 0 var(--border-c);
}
.sidebar::-webkit-scrollbar { width:4px; }
.sidebar::-webkit-scrollbar-thumb { background:#d1d5db; border-radius:2px; }

.sidebar-logo {
  padding:22px 20px 16px;
  border-bottom:1px solid var(--border-c);
  flex-shrink:0;
}
.sidebar-logo h2 {
  font-family:'Noto Serif Thai',serif;
  font-size:18px; color:var(--text); font-weight:700;
}
.sidebar-logo h2 span { color:var(--accent); }
.sidebar-logo p { font-size:12px; letter-spacing:1.5px; color:var(--muted); margin-top:3px; text-transform:uppercase; }

.nav-section { padding:12px 10px 4px; }
.nav-section-label {
  font-size:12px; letter-spacing:1px; text-transform:uppercase;
  color:#9ca3af; padding:0 8px; margin-bottom:5px; font-weight:600;
}
.nav-link {
  display:flex; align-items:center; gap:9px;
  padding:7px 10px; border-radius:6px;
  color:#4b5563; font-size:13px;
  text-decoration:none; transition:.15s; cursor:pointer;
  border:none; background:none; width:100%; text-align:left;
}
.nav-link:hover { background:#f3f4f6; color:var(--text); }
.nav-link.active { background:var(--accent-p); color:var(--accent); font-weight:600; }
.nav-link .dot { width:5px; height:5px; border-radius:50%; background:currentColor; flex-shrink:0; opacity:.6; }

/* ── MAIN ── */
.main {
  margin-left:var(--sidebar);
  flex:1; min-height:100vh;
  max-width:900px;
}

/* ── TOP BAR ── */
.topbar {
  position:sticky; top:0; z-index:40;
  background:rgba(255,255,255,.95);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border-c);
  padding:12px 40px;
  display:flex; align-items:center; justify-content:space-between;
  box-shadow:0 1px 3px rgba(0,0,0,.06);
}
.topbar-title { font-size:13px; color:var(--muted); }
.topbar-title strong { color:var(--accent); }
.print-btn {
  background:#fff; border:1px solid var(--border-c);
  color:#374151; padding:5px 14px; border-radius:6px;
  font-size:12px; cursor:pointer; font-family:'Sarabun',sans-serif;
  transition:.15s; box-shadow:0 1px 2px rgba(0,0,0,.05);
}
.print-btn:hover { background:#f9fafb; border-color:#d1d5db; }

/* ── CONTENT ── */
.content { padding:0 40px 80px; }

/* ── SECTION ── */
.doc-section {
  padding-top:48px;
  border-bottom:1px solid #e5e7eb;
  margin-bottom:0;
}
.doc-section:last-child { border-bottom:none; }

.section-tag {
  display:inline-flex; align-items:center; gap:8px;
  font-size:10.5px; letter-spacing:2px; color:var(--accent);
  text-transform:uppercase; margin-bottom:12px; font-weight:600;
}
.section-tag::before {
  content:''; width:16px; height:2px; background:var(--accent); opacity:.5; border-radius:1px;
}

.section-title {
  font-family:'Noto Serif Thai',serif;
  font-size:clamp(20px,3vw,28px);
  font-weight:700; color:#111827;
  margin-bottom:14px; line-height:1.3;
}

.section-intro {
  font-size:15px; color:#4b5563; max-width:680px;
  margin-bottom:28px; line-height:1.85;
}

/* ── STEPS ── */
.steps { display:flex; flex-direction:column; gap:0; }
.step {
  display:flex; gap:18px;
  padding:20px 0;
  border-bottom:1px solid #f3f4f6;
}
.step:last-child { border-bottom:none; }
.step-num {
  width:34px; height:34px; border-radius:50%; flex-shrink:0;
  background:var(--accent-p); border:1.5px solid #bfdbfe;
  display:flex; align-items:center; justify-content:center;
  font-family:'Noto Serif Thai',serif;
  font-size:14px; font-weight:700; color:var(--accent);
}
.step-body { flex:1; }
.step-title {
  font-family:'Noto Serif Thai',serif;
  font-size:15px; font-weight:700; color:#111827;
  margin-bottom:7px;
}
.step-desc { font-size:13.5px; color:#6b7280; line-height:1.85; }

/* ── CODE ── */
pre {
  background:#1e293b;
  border:1px solid #334155;
  border-radius:8px;
  padding:16px 20px;
  overflow-x:auto;
  margin:14px 0;
  position:relative;
}
code {
  font-family:'JetBrains Mono',monospace;
  font-size:12.5px; color:#e2e8f0; line-height:1.75;
}
p code, li code, td code {
  background:#eff6ff;
  border:1px solid #bfdbfe;
  color:#1d4ed8;
  padding:1px 6px; border-radius:4px;
  font-size:12.5px; font-family:'JetBrains Mono',monospace;
}
.code-label {
  font-size:11px; letter-spacing:1px; color:#6b7280; font-weight:600;
  text-transform:uppercase; margin-bottom:6px; margin-top:16px;
}
.hl-green { color:#6ddb99; }
.hl-gold  { color:var(--gold-l); }
.hl-blue  { color:var(--blue); }
.hl-muted { color:var(--muted); }

/* ── CARDS ── */
.card-grid { display:grid; grid-template-columns:1fr 1fr; gap:12px; margin:16px 0; }
.card-grid-3 { grid-template-columns:1fr 1fr 1fr; }
.info-card {
  background:#fff;
  border:1px solid #e5e7eb;
  border-radius:10px; padding:18px;
  box-shadow:0 1px 3px rgba(0,0,0,.05);
}
.info-card .ic-icon { font-size:22px; margin-bottom:9px; }
.info-card .ic-title {
  font-family:'Noto Serif Thai',serif;
  font-size:14px; font-weight:700; color:#111827; margin-bottom:5px;
}
.info-card .ic-desc { font-size:13px; color:#6b7280; line-height:1.7; }

/* ── ALERTS ── */
.alert {
  padding:13px 16px; border-radius:8px;
  margin:16px 0; display:flex; gap:11px; align-items:flex-start;
  font-size:13.5px; line-height:1.75;
}
.alert-icon { font-size:15px; flex-shrink:0; margin-top:2px; }
.alert-warn { background:#fffbeb; border:1px solid #fcd34d; color:#92400e; }
.alert-info { background:#eff6ff; border:1px solid #bfdbfe; color:#1e40af; }
.alert-success { background:#f0fdf4; border:1px solid #86efac; color:#166534; }
.alert-danger { background:#fef2f2; border:1px solid #fca5a5; color:#991b1b; }

/* ── TABLE ── */
.doc-table { width:100%; border-collapse:collapse; margin:16px 0; font-size:13.5px; border:1px solid #e5e7eb; border-radius:8px; overflow:hidden; }
.doc-table th {
  text-align:left; font-size:11px; letter-spacing:1px;
  text-transform:uppercase; color:#6b7280; font-weight:600;
  padding:10px 14px; border-bottom:1px solid #e5e7eb;
  background:#f9fafb;
}
.doc-table td { padding:10px 14px; border-bottom:1px solid #f3f4f6; vertical-align:top; color:#374151; }
.doc-table tr:last-child td { border-bottom:none; }
.doc-table tr:hover td { background:#f9fafb; }

/* ── FILE TREE ── */
.file-tree {
  background:#1e293b;
  border:1px solid #334155;
  color:#fff;
  border-radius:8px; padding:18px 20px;
  font-family:'JetBrains Mono',monospace;
  font-size:12.5px; line-height:2.1;
  margin:14px 0;
}
.ft-dir  { color:#93c5fd; font-weight:500; }
.ft-file { color:#e2e8f0; }
.ft-cmt  { color:#64748b; }

/* ── BADGE ── */
.badge {
  display:inline-flex; align-items:center;
  font-size:11px; padding:2px 8px; border-radius:4px; font-weight:600; letter-spacing:.3px;
}
.badge-green { background:#dcfce7; border:1px solid #86efac; color:#166534; }
.badge-red   { background:#fee2e2; border:1px solid #fca5a5; color:#991b1b; }
.badge-gold  { background:#fef9c3; border:1px solid #fde047; color:#854d0e; }
.badge-blue  { background:#eff6ff; border:1px solid #bfdbfe; color:#1d4ed8; }

/* ── SCREEN MOCKUP ── */
.mockup {
  background:#0a0806;
  border:1px solid var(--border);
  border-radius:12px; overflow:hidden;
  margin:16px 0;
}
.mockup-bar {
  background:var(--card);
  padding:10px 14px;
  display:flex; align-items:center; gap:8px;
  border-bottom:1px solid var(--border);
}
.mockup-dot { width:10px; height:10px; border-radius:50%; }
.mockup-url {
  flex:1; background:rgba(255,255,255,.05);
  border:1px solid var(--border); border-radius:5px;
  padding:4px 10px; font-size:11.5px; color:var(--muted);
  font-family:'JetBrains Mono',monospace;
}
.mockup-body { padding:18px 20px; }

/* ── DIVIDER ── */
.divider { border:none; border-top:1px solid #e5e7eb; margin:28px 0; }

/* ── TOC progress ── */
.toc-progress {
  position:fixed; top:0; left:0; right:0; height:2px;
  background:linear-gradient(90deg,var(--accent),#60a5fa);
  transform-origin:left; transform:scaleX(0);
  transition:transform .1s; z-index:999;
}

/* ── RESPONSIVE ── */
@media(max-width:900px) {
  .sidebar { display:none; }
  .main { margin-left:0; max-width:100%; }
  .content { padding:0 20px 60px; }
  .card-grid { grid-template-columns:1fr; }
  .card-grid-3 { grid-template-columns:1fr 1fr; }
}
@media(max-width:560px) {
  .card-grid-3 { grid-template-columns:1fr; }
  .topbar { padding:12px 20px; }
}

/* ── PRINT ── */
@media print {
  .sidebar, .topbar, .toc-progress { display:none !important; }
  .main { margin-left:0 !important; max-width:100% !important; }
  .content { padding:0 20px !important; }
}