:root {
  --primary: #1D6F42;
  --primary-dark: #155231;
  --primary-light: #e8f5ee;
  --bg: #f9f7f5;
  --surface: #ffffff;
  --border: #e5ddd5;
  --text: #2c2c2c;
  --text-muted: #6b6b6b;
  --code-bg: #f0f7f3;
  --sidebar-w: 260px;
}

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

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

/* ── TOP BAR ── */
header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 56px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 12px;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
}
header .logo {
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.5px;
}
header .logo span { color: #a8d5b8; }
header .version {
  font-size: 12px;
  background: rgba(255,255,255,.2);
  padding: 2px 8px;
  border-radius: 20px;
}

/* ── SIDEBAR ── */
nav {
  position: fixed;
  top: 56px; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  padding: 20px 0;
  z-index: 90;
}
nav .nav-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 0 20px 8px;
}
nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 20px;
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  border-left: 3px solid transparent;
  transition: background .15s, border-color .15s;
}
nav a:hover { background: var(--primary-light); }
nav a.active {
  border-left-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary-dark);
  font-weight: 600;
}
nav a .num {
  font-size: 11px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  padding: 1px 7px;
  font-weight: 700;
  min-width: 24px;
  text-align: center;
}
nav a.active .num { background: var(--primary); color: #fff; }

/* ── MAIN CONTENT ── */
main {
  margin-left: var(--sidebar-w);
  margin-top: 56px;
  padding: 40px 48px;
  max-width: 900px;
}

/* ── HERO ── */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: 12px;
  padding: 40px 36px;
  margin-bottom: 40px;
}
.hero h1 { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.hero p { font-size: 16px; opacity: .88; max-width: 520px; }
.hero .meta {
  display: flex;
  gap: 20px;
  margin-top: 20px;
  font-size: 13px;
  opacity: .75;
}

/* ── SECTIONS ── */
section { margin-bottom: 56px; scroll-margin-top: 76px; }

section h2 {
  font-size: 22px;
  font-weight: 700;
  color: var(--primary-dark);
  border-bottom: 2px solid var(--primary-light);
  padding-bottom: 10px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
section h2 .icon {
  width: 32px; height: 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px;
}

section h3 {
  font-size: 15px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--primary);
  margin: 24px 0 12px;
}

p { margin-bottom: 12px; }

/* ── STEPS ── */
.steps { list-style: none; counter-reset: step; }
.steps > li {
  counter-increment: step;
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  align-items: flex-start;
}
.steps > li::before {
  content: counter(step);
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--primary);
  color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 13px;
}
.steps > li > .step-body > strong {
  display: block;
  margin-bottom: 8px;
  font-size: 15px;
  color: var(--primary-dark);
}

/* ── FUNCTION TABLE ── */
.fn-table { width: 100%; border-collapse: collapse; font-size: 14px; margin-bottom: 24px; }
.fn-table th {
  background: var(--primary);
  color: #fff;
  text-align: left;
  padding: 10px 14px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.fn-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.fn-table tr:nth-child(even) td { background: var(--code-bg); }
.fn-table td code {
  font-family: 'Consolas', 'Courier New', monospace;
  font-size: 12.5px;
  color: var(--primary-dark);
  white-space: nowrap;
}
.fn-table .cat-row td {
  background: var(--primary-light);
  font-weight: 700;
  color: var(--primary-dark);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  padding: 6px 14px;
  border-bottom: 1px solid var(--border);
}

/* ── CARDS ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 20px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 18px;
  border-top: 3px solid var(--primary);
}
.card .card-icon { font-size: 26px; margin-bottom: 8px; }
.card h4 { font-size: 14px; font-weight: 700; margin-bottom: 6px; }
.card p { font-size: 13px; color: var(--text-muted); margin: 0; }

/* ── TWO-COLUMN PANEL LAYOUT ── */
.panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}

/* ── THREE-COLUMN PANEL LAYOUT ── */
.panels-3 {
  grid-template-columns: 1fr 1fr 1fr;
}
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
}
.panel h4 {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--primary);
  margin-bottom: 12px;
}

/* ── BUTTON LIST ── */
.btn-list { list-style: none; }
.btn-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.btn-list li:last-child { border-bottom: none; }
.btn-tag {
  flex-shrink: 0;
  background: var(--primary);
  color: #fff;
  font-size: 11px;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 4px;
  white-space: nowrap;
}
.btn-tag.secondary {
  background: var(--surface);
  color: var(--primary);
  border: 1px solid var(--primary);
}

/* ── TIPS ── */
.tip {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--primary-light);
  border-left: 4px solid var(--primary);
  border-radius: 6px;
  padding: 14px 16px;
  margin-bottom: 12px;
  font-size: 14px;
}
.tip .tip-icon { font-size: 18px; flex-shrink: 0; margin-top: 1px; }

/* ── INLINE CODE ── */
code {
  font-family: 'Consolas', 'Courier New', monospace;
  background: var(--code-bg);
  color: var(--primary-dark);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 13px;
}

/* ── NOTE BOX ── */
.note {
  background: #fff8e1;
  border-left: 4px solid #f9a825;
  border-radius: 6px;
  padding: 12px 16px;
  font-size: 14px;
  margin-top: 8px;
}
.note strong { color: #e65100; }

/* ── SCROLLBAR ── */
nav::-webkit-scrollbar { width: 4px; }
nav::-webkit-scrollbar-thumb { background: var(--border); border-radius: 2px; }

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  nav { display: none; }
  main { margin-left: 0; padding: 24px 20px; }
  .panels { grid-template-columns: 1fr; }
  .panels-3 { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr 1fr; }
}