:root {
  --bg: #f4f5f7; --surface: #ffffff; --surface-2: #eef0f3; --text: #16191f; --muted: #5d6573;
  --line: #d9dde3; --accent: #ea5b0c; --accent-ink: #ffffff; --accent-soft: #fde7da;
  --part: #c4cad3; --part-stroke: #8a93a0; --ctx: #e6e9ee; --ctx-stroke: #c3c8d0;
  --warn-bg: #fff6e0; --warn-ink: #7a5300; --radius: 14px;
  --shadow: 0 1px 2px rgba(16,24,40,.06), 0 8px 24px rgba(16,24,40,.06);
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111418; --surface: #1a1e24; --surface-2: #232830; --text: #eceef1; --muted: #9aa3b0;
    --line: #2f3540; --accent: #ff7a2e; --accent-soft: #3a2518;
    --part: #4a525e; --part-stroke: #6b7482; --ctx: #262b33; --ctx-stroke: #3a414c;
    --warn-bg: #33290f; --warn-ink: #f3cf7a;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.55 var(--font); }
a { color: var(--accent); }
img, svg { max-width: 100%; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }

/* header */
.site-head { background: var(--surface); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; color: var(--text); text-decoration: none; letter-spacing: -.02em; }
.logo svg { width: 28px; height: 28px; }
.logo b { color: var(--accent); }
.site-head nav a { color: var(--muted); text-decoration: none; font-size: 14px; margin-left: 16px; }

/* hero + tool */
.hero { padding: 22px 0 8px; }
h1 { font-size: clamp(1.45rem, 3.6vw, 2.1rem); line-height: 1.2; margin: 0 0 6px; letter-spacing: -.02em; }
.sub { margin: 0 0 16px; color: var(--muted); }
.tool-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; }
.tabs { display: flex; gap: 6px; background: var(--surface-2); padding: 4px; border-radius: 10px; margin-bottom: 14px; }
.tab { flex: 1; border: 0; background: transparent; padding: 9px 10px; border-radius: 8px; font: 600 14px var(--font); color: var(--muted); cursor: pointer; }
.tab[aria-selected="true"] { background: var(--surface); color: var(--text); box-shadow: 0 1px 3px rgba(0,0,0,.1); }
.search-row { display: flex; gap: 8px; }
.search-row input { flex: 1; min-width: 0; }
input[type="search"], select { width: 100%; font: 16px var(--font); padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--text); }
input:focus, select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.btn { border: 0; background: var(--accent); color: var(--accent-ink); font: 700 16px var(--font); padding: 12px 20px; border-radius: 10px; cursor: pointer; white-space: nowrap; }
.btn:hover { filter: brightness(1.06); }
.examples { margin: 10px 0 0; font-size: 13px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.js-example { border: 1px solid var(--line); background: var(--surface-2); color: var(--text); border-radius: 999px; padding: 4px 10px; font: 13px var(--font); cursor: pointer; }
.sel-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }
.sel-grid label, .side-field legend { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 4px; }
.side-field { border: 0; padding: 0; margin: 12px 0 0; }
.side-field .opts { display: flex; gap: 14px; flex-wrap: wrap; }
.side-field .opts label { font-size: 15px; display: flex; align-items: center; gap: 6px; }
.sel-actions { margin-top: 12px; display: flex; align-items: center; gap: 12px; }
.sel-error { color: #c62828; font-size: 14px; }
.badge { margin: 10px 2px 0; font-size: 13px; color: var(--muted); }
.nojs-msg { display: block; padding: 10px; background: var(--warn-bg); color: var(--warn-ink); border-radius: 8px; }
.js .nojs-msg { display: none; }

/* results */
#results { margin-top: 18px; display: grid; gap: 16px; }
.results-msg { margin: 0; padding: 14px 16px; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.chips-title { margin: 6px 0 -6px; font-size: 13px; font-weight: 700; color: var(--muted); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { border: 1.5px solid var(--line); background: var(--surface); color: var(--text); padding: 8px 12px; border-radius: 999px; font: 14px var(--font); cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.result { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow); padding: 16px; scroll-margin-top: 12px; }
.result-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.result h3 { margin: 2px 0; font-size: 1.25rem; letter-spacing: -.01em; }
.result-veh { margin: 0; font-size: 13px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .04em; }
.result-veh span { color: var(--muted); font-weight: 600; }
.result-group { margin: 0; color: var(--muted); font-size: 14px; }
.side-toggle { display: inline-flex; background: var(--surface-2); border-radius: 10px; padding: 3px; }
.side-toggle button { border: 0; background: transparent; padding: 7px 12px; border-radius: 8px; font: 600 14px var(--font); color: var(--muted); cursor: pointer; }
.side-toggle button.on { background: var(--accent); color: var(--accent-ink); }
.ref-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.ref-label { font-size: 13px; color: var(--muted); font-weight: 600; }
.ref-code { font: 700 1.35rem ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace; background: var(--surface-2); padding: 4px 12px; border-radius: 8px; letter-spacing: .03em; }
.ref-missing { color: var(--muted); font-style: italic; }
.ref-opts-title { margin: 14px 0 -4px; font-size: 14px; font-weight: 600; }
.ref-opts-title ~ .ref-row { margin-top: 8px; }
.ref-opts-title ~ .ref-row .ref-label { flex: 0 0 300px; max-width: 100%; color: var(--text); font-weight: 500; }
@media (max-width: 640px) { .ref-opts-title ~ .ref-row .ref-label { flex-basis: 100%; } }
.btn-ghost { border: 1.5px solid var(--line); background: transparent; color: var(--text); font: 600 14px var(--font); padding: 7px 12px; border-radius: 8px; cursor: pointer; }
.ref-warn { margin: 8px 0 0; font-size: 13px; background: var(--warn-bg); color: var(--warn-ink); padding: 6px 10px; border-radius: 8px; display: inline-block; }
.ref-note { margin: 6px 0 0; font-size: 14px; color: var(--muted); }
.visual { display: grid; grid-template-columns: 180px 1fr; gap: 14px; margin-top: 14px; }
.visual figure { margin: 0; background: var(--surface-2); border-radius: 12px; padding: 10px; display: flex; flex-direction: column; align-items: center; }
.visual figcaption { font-size: 12px; color: var(--muted); margin-top: 6px; text-align: center; }
.fig-car svg { width: 100%; max-width: 170px; height: auto; }
.fig-asm svg { width: 100%; height: auto; }
.ext-links { margin-top: 12px; display: flex; flex-wrap: wrap; gap: 8px 14px; font-size: 14px; align-items: center; }
.ext-links span { color: var(--muted); }
.ext-links a { font-weight: 600; }

/* diagrams */
.diagram .ctx { fill: var(--ctx); stroke: var(--ctx-stroke); stroke-width: 1.5; }
.diagram .ctx.tire { fill: var(--surface); stroke: var(--part-stroke); stroke-width: 6; }
.diagram .ctx-line { fill: none; stroke: var(--ctx-stroke); stroke-width: 10; stroke-linecap: round; }
.diagram .ctx-line.thin { stroke-width: 12; }
.dg-part > * { fill: var(--part); stroke: var(--part-stroke); stroke-width: 1.5; transition: fill .2s; }
.dg-part .stroke { fill: none; stroke: var(--part-stroke); stroke-width: 6; stroke-linejoin: round; stroke-linecap: round; }
.dg-part .hole { fill: var(--surface-2); }
.dg-part .rib { fill: none; }
.dg-part.hl > * { fill: var(--accent); stroke: #9a3a05; stroke-width: 2.5; }
.dg-part.hl .stroke { fill: none; stroke: var(--accent); stroke-width: 7; }
.dg-part.hl .hole { fill: #fff; }
.dg-part.hl .rib { fill: none; stroke: #fff; }
.dg-part.hl { animation: pulse 1.6s ease-in-out infinite; filter: drop-shadow(0 0 6px rgba(234,91,12,.55)); }
.dg-label line { stroke: var(--muted); stroke-width: 1; opacity: .55; }
.dg-label circle { fill: var(--muted); opacity: .6; }
.dg-label text { font: 500 12.5px var(--font); fill: var(--muted); }
.dg-label.hl line { stroke: var(--accent); stroke-width: 2; opacity: 1; }
.dg-label.hl circle { fill: var(--accent); opacity: 1; }
.dg-label.hl text { font-weight: 800; font-size: 15px; fill: var(--accent); }
.dg-ctx-label { font: italic 11px var(--font); fill: var(--muted); opacity: .8; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .72; } }
@media (prefers-reduced-motion: reduce) { .dg-part.hl { animation: none; } }

.car .car-body { fill: var(--surface); stroke: var(--part-stroke); stroke-width: 2.5; }
.car .car-glass { fill: var(--ctx); stroke: var(--ctx-stroke); }
.car .car-wheel { fill: var(--part); stroke: var(--part-stroke); stroke-width: 1.5; }
.car .car-zone { fill: var(--ctx); stroke: var(--ctx-stroke); stroke-dasharray: 4 3; }
.car .hl { fill: var(--accent); stroke: #9a3a05; stroke-width: 2.5; stroke-dasharray: none; animation: pulse 1.6s ease-in-out infinite; }
.car .car-zlabel, .car .car-side, .car .car-small { font: 700 11px var(--font); fill: var(--muted); letter-spacing: .06em; }
.car .car-small { font-weight: 500; font-size: 9px; letter-spacing: 0; }
.car .car-dir { font: 800 11px var(--font); fill: var(--accent); letter-spacing: .08em; }
.car .car-wheel-s { fill: none; stroke: var(--muted); stroke-width: 2.5; }

/* ads */
.ad-slot { margin: 22px auto; min-height: 100px; border: 1.5px dashed var(--line); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: var(--muted); font-size: 12px; letter-spacing: .08em; text-transform: uppercase; }
.ad-slot.tall { min-height: 250px; }

/* content */
.content { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 8px 20px 18px; margin: 22px 0; }
.content h2 { font-size: 1.3rem; margin: 20px 0 8px; letter-spacing: -.01em; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; padding: 0; list-style: none; }
.steps li { background: var(--surface-2); border-radius: 12px; padding: 14px; font-size: 15px; }
.steps b { display: block; color: var(--accent); margin-bottom: 4px; }
details { border-bottom: 1px solid var(--line); padding: 10px 0; }
summary { cursor: pointer; font-weight: 600; }
details p { margin: 8px 0 2px; color: var(--muted); }
.legal h1 { margin-top: 24px; }
.legal { padding-bottom: 30px; }
.todo { background: var(--warn-bg); color: var(--warn-ink); padding: 0 4px; border-radius: 4px; }

/* footer */
.site-foot { border-top: 1px solid var(--line); padding: 20px 0 90px; font-size: 14px; color: var(--muted); }
.site-foot .wrap { display: flex; flex-wrap: wrap; gap: 8px 18px; justify-content: space-between; }
.site-foot a { color: var(--muted); }

/* cookie banner */
#cookie-banner { position: fixed; left: 12px; right: 12px; bottom: 12px; z-index: 50; max-width: 720px; margin: 0 auto; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 10px 40px rgba(0,0,0,.2); padding: 14px 16px; display: flex; gap: 12px 16px; align-items: center; flex-wrap: wrap; font-size: 14px; }
#cookie-banner[hidden] { display: none; }
#cookie-banner p { margin: 0; flex: 1 1 320px; }
#cookie-banner .cb-actions { display: flex; gap: 8px; }
#cookie-banner .btn { font-size: 14px; padding: 9px 14px; }

@media (max-width: 720px) {
  .sel-grid { grid-template-columns: 1fr; }
  .visual { grid-template-columns: 1fr; }
  .fig-car svg { max-width: 130px; }
  .steps { grid-template-columns: 1fr; }
  .site-head nav a:not(:last-child) { display: none; }
  .search-row .btn { padding: 12px 14px; }
}