/* ============================================================
   Автокайф — Docs theme (GitHub-inspired)
   Sidebar + info-dense + tables + numbered steps
   ============================================================ */

:root {
  --bg: #ffffff;
  --bg-soft: #f6f8fa;
  --bg-code: #f6f8fa;
  --border: #d0d7de;
  --border-soft: #e1e4e8;
  --text: #1f2328;
  --text-soft: #59636e;
  --text-muted: #818b98;
  --accent: #0969da;
  --accent-hover: #0860c7;
  --accent-soft: #ddf4ff;
  --success: #1f883d;
  --success-soft: #dafbe1;
  --warning: #bf8700;
  --warning-soft: #fff8c5;
  --radius: 6px;
  --shadow-sm: 0 1px 0 rgba(31,35,40,0.04);
  --container-max: 1280px;
  --sidebar-w: 240px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Noto Sans", sans-serif;
  -webkit-font-smoothing: antialiased;
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  font-size: 14px;
}

.mono { font-family: "SF Mono", Monaco, Consolas, "Liberation Mono", monospace; font-size: 85%; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}
.site-header .logo {
  height: 40px;
  display: block;
}
.site-header .main-nav {
  display: flex;
  gap: 4px;
  margin-left: 16px;
  flex: 1;
}
.site-header .main-nav a {
  color: var(--text);
  padding: 6px 12px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
}
.site-header .main-nav a:hover { background: var(--bg-soft); text-decoration: none; }
.site-header .main-nav a.active { font-weight: 600; color: var(--accent); }
.site-header .header-cta {
  background: var(--accent);
  color: white !important;
  padding: 6px 14px !important;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
}
.site-header .header-cta:hover { background: var(--accent-hover); text-decoration: none; }

/* ============================================================
   Layout: sidebar + main
   ============================================================ */
.layout {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 32px 24px 64px;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 48px;
  align-items: start;
}
.sidebar {
  position: sticky;
  top: 72px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
}
.sidebar h4 {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  font-weight: 600;
  margin: 16px 0 8px;
  letter-spacing: 0.05em;
  padding-left: 12px;
}
.sidebar h4:first-child { margin-top: 0; }
.sidebar a {
  display: block;
  padding: 4px 12px;
  color: var(--text-soft);
  font-size: 14px;
  border-left: 2px solid transparent;
}
.sidebar a:hover { color: var(--text); text-decoration: none; }
.sidebar a.active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 600;
  background: linear-gradient(to right, var(--accent-soft), transparent 50%);
}

/* ============================================================
   Main content
   ============================================================ */
.main h1 {
  font-size: 32px;
  font-weight: 600;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 12px;
}
.main h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 12px;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 8px;
}
.main h3 { font-size: 17px; font-weight: 600; margin: 24px 0 8px; }
.main p { margin-bottom: 12px; }
.main ul, .main ol { margin: 0 0 16px 24px; }
.main li { margin-bottom: 4px; }
.main code {
  font-family: "SF Mono", monospace;
  font-size: 85%;
  background: var(--bg-code);
  padding: 1px 6px;
  border-radius: var(--radius);
}
.main .lead {
  font-size: 16px;
  color: var(--text-soft);
  margin-bottom: 24px;
}

/* ============================================================
   Cards (stats)
   ============================================================ */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-bottom: 32px;
}
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--bg);
}
.card .num {
  font-size: 26px;
  font-weight: 600;
  color: var(--accent);
  font-family: "SF Mono", monospace;
  line-height: 1.2;
}
.card .lbl {
  font-size: 12px;
  color: var(--text-soft);
  margin-top: 2px;
}

/* ============================================================
   Tables
   ============================================================ */
.info-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 24px;
  font-size: 13px;
}
.info-table th, .info-table td {
  text-align: left;
  padding: 8px 12px;
  border: 1px solid var(--border-soft);
  vertical-align: top;
}
.info-table th {
  background: var(--bg-soft);
  font-weight: 600;
  font-size: 12px;
}
.info-table tr:hover td { background: rgba(208, 215, 222, 0.08); }

/* ============================================================
   Tags / Badges
   ============================================================ */
.tag {
  display: inline-block;
  padding: 1px 8px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 11px;
  font-family: "SF Mono", monospace;
  color: var(--text-soft);
  white-space: nowrap;
}
.tag.green { background: var(--success-soft); border-color: rgba(31, 136, 61, 0.3); color: var(--success); }
.tag.blue { background: var(--accent-soft); border-color: rgba(9, 105, 218, 0.3); color: var(--accent); }
.tag.yellow { background: var(--warning-soft); border-color: rgba(191, 135, 0, 0.3); color: var(--warning); }

/* ============================================================
   Formula block
   ============================================================ */
.formula {
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  margin: 16px 0;
  font-family: "SF Mono", monospace;
  font-size: 13px;
  line-height: 1.7;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.formula .op { color: var(--text-muted); }
.formula .num { color: var(--accent); }

/* ============================================================
   Numbered steps
   ============================================================ */
.steps { counter-reset: step; }
.step {
  padding: 12px 0 14px 48px;
  position: relative;
  border-bottom: 1px solid var(--border-soft);
}
.step:last-child { border-bottom: none; }
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0;
  top: 12px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-family: "SF Mono", monospace;
  font-size: 13px;
}
.step strong { display: block; margin-bottom: 4px; font-weight: 600; }
.step .meta { color: var(--text-soft); font-size: 13px; }
.step .meta .tag { margin-left: 6px; }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 14px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}
.btn-primary { background: var(--accent); color: white; }
.btn-primary:hover { background: var(--accent-hover); text-decoration: none; }
.btn-secondary { background: var(--bg); color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--bg-soft); text-decoration: none; }

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  background: var(--bg-soft);
  margin-top: 64px;
}
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--text-soft);
  font-size: 12px;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-inner a { color: var(--text-soft); margin-left: 12px; }
.footer-inner a:hover { color: var(--accent); text-decoration: none; }

/* ============================================================
   Calculator-specific
   ============================================================ */
.calc-tabs {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 24px;
}
.calc-tab {
  padding: 8px 16px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-soft);
  border-radius: var(--radius) var(--radius) 0 0;
  margin-bottom: -1px;
}
.calc-tab.active {
  background: var(--bg);
  border-color: var(--border);
  color: var(--text);
  font-weight: 600;
}
.calc-tab:hover:not(.active) { color: var(--text); background: var(--bg-soft); }
.calc-form { display: grid; grid-template-columns: 1fr 1fr; gap: 16px 24px; margin-bottom: 24px; }
.calc-form .full { grid-column: 1 / -1; }
.calc-form label {
  display: block;
  font-size: 12px;
  color: var(--text-soft);
  margin-bottom: 4px;
  font-weight: 500;
}
.calc-form input, .calc-form select {
  width: 100%;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
}
.calc-form input:focus, .calc-form select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(9, 105, 218, 0.15);
}
.calc-result {
  background: var(--bg-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 16px;
  margin-top: 16px;
}
.calc-result .total {
  font-size: 28px;
  font-weight: 600;
  color: var(--accent);
  font-family: "SF Mono", monospace;
}
.calc-result .breakdown {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-soft);
  font-family: "SF Mono", monospace;
  font-size: 12px;
}
.calc-result .breakdown .row {
  display: flex;
  justify-content: space-between;
  padding: 2px 0;
}
.calc-result .breakdown .label { color: var(--text-soft); }
.calc-result .breakdown .val { color: var(--text); }

/* ============================================================
   Catalog
   ============================================================ */
.catalog-filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-soft);
}
.catalog-filters .filter {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  background: var(--bg);
  color: var(--text);
}
.catalog-filters .filter.active { background: var(--accent); color: white; border-color: var(--accent); }
.car-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.car-row {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 12px;
  display: grid;
  grid-template-columns: 80px 1fr auto;
  gap: 12px;
  align-items: center;
}
.car-row .car-thumb {
  width: 80px;
  height: 60px;
  background: linear-gradient(135deg, var(--bg-soft), var(--border-soft));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 11px;
}
.car-row .car-info .title { font-weight: 600; font-size: 14px; }
.car-row .car-info .meta { font-size: 12px; color: var(--text-soft); margin-top: 2px; }
.car-row .car-price { font-family: "SF Mono", monospace; font-weight: 600; color: var(--accent); font-size: 16px; text-align: right; }

/* ============================================================
   Mobile
   ============================================================ */
@media (max-width: 768px) {
  .layout { grid-template-columns: 1fr; gap: 16px; padding: 16px; }
  .sidebar {
    position: static;
    max-height: none;
    border-bottom: 1px solid var(--border-soft);
    padding-bottom: 16px;
    margin-bottom: 16px;
  }
  .header-inner { padding: 0 16px; flex-wrap: wrap; }
  .site-header .main-nav { width: 100%; order: 3; flex-wrap: wrap; margin-left: 0; }
  .cards { grid-template-columns: 1fr; }
  .car-list { grid-template-columns: 1fr; }
  .calc-form { grid-template-columns: 1fr; }
  .main h1 { font-size: 26px; }
}