:root {
  --bg: #0b0b0d;
  --bg2: #141417;
  --panel: #1b1b20;
  --line: #2a2a32;
  --text: #f4f4f5;
  --muted: #a1a1aa;
  --amber: #f99c00;
  --amber-dark: #c97a00;
  --silver: #c8ccd2;
  --green: #22c55e;
  --red: #ef4444;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Barlow', system-ui, sans-serif;
  line-height: 1.55;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; width: 100%; max-width: 1080px; margin: 0 auto; padding: 1.25rem 1rem 3rem; }
h1, h2, h3, .display { font-family: 'Oswald', sans-serif; text-transform: uppercase; letter-spacing: .02em; }
a { color: var(--amber); }
img { max-width: 100%; }

/* ---- top bar ---- */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: .8rem 1rem; background: #000; border-bottom: 2px solid var(--amber);
  position: sticky; top: 0; z-index: 20;
}
.brand { text-decoration: none; display: flex; align-items: baseline; gap: .5rem; }
.brand-mark { font-family: 'Oswald'; font-weight: 700; font-size: 1.5rem; color: #fff; }
.brand-sub { font-family: 'Oswald'; font-weight: 500; font-size: .85rem; color: var(--amber); letter-spacing: .18em; }
.topbar nav { display: flex; gap: 1rem; }
.topbar nav a { color: var(--silver); text-decoration: none; font-weight: 600; font-size: .9rem; text-transform: uppercase; font-family: 'Oswald'; }
.topbar nav a:hover { color: var(--amber); }

/* ---- hero ---- */
.hero { text-align: center; padding: 3rem 1rem 2.5rem; }
.hero .eyebrow { color: var(--amber); font-family: 'Oswald'; letter-spacing: .25em; font-size: .8rem; }
.hero h1 { font-size: clamp(2rem, 7vw, 3.6rem); margin: .6rem 0 1rem; line-height: 1.1; }
.hero h1 .accent { color: var(--amber); }
.hero p.lead { color: var(--muted); max-width: 34rem; margin: 0 auto 1.8rem; font-size: 1.05rem; }
.cta {
  display: inline-block; background: var(--amber); color: #111;
  font-family: 'Oswald'; font-weight: 700; font-size: 1.15rem; text-transform: uppercase;
  padding: .9rem 2.2rem; border-radius: 6px; text-decoration: none; border: none; cursor: pointer;
}
.cta:hover { background: var(--amber-dark); color: #fff; }
.cta.secondary { background: transparent; color: var(--amber); border: 2px solid var(--amber); }
.cta:disabled { opacity: .55; cursor: wait; }
.steps { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .8rem; margin: 2.5rem auto 0; max-width: 720px; }
.step { background: var(--panel); border: 1px solid var(--line); border-radius: 8px; padding: 1rem .8rem; }
.step .n { font-family: 'Oswald'; color: var(--amber); font-size: 1.4rem; font-weight: 700; }
.step p { margin: .4rem 0 0; color: var(--muted); font-size: .9rem; }

/* ---- forms ---- */
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 1.4rem; margin: 1rem 0; }
.field { margin-bottom: 1rem; }
.field label { display: block; font-weight: 600; margin-bottom: .35rem; font-size: .95rem; }
.field input, .field select {
  width: 100%; padding: .7rem .8rem; border-radius: 6px; border: 1px solid var(--line);
  background: var(--bg2); color: var(--text); font-size: 1rem; font-family: inherit;
}
.field input:focus, .field select:focus { outline: 2px solid var(--amber); border-color: var(--amber); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
@media (max-width: 560px) { .grid2 { grid-template-columns: 1fr; } }
.hint { color: var(--muted); font-size: .85rem; }
.error { color: var(--red); font-weight: 600; }
.success { color: var(--green); font-weight: 600; }
.photo-guide { background: var(--bg2); border-left: 4px solid var(--amber); padding: .9rem 1rem; border-radius: 0 8px 8px 0; margin: 1rem 0; }
.photo-guide ul { margin: .4rem 0 0; padding-left: 1.2rem; color: var(--muted); }
#photo-preview { display: none; border-radius: 8px; margin-top: .8rem; border: 1px solid var(--line); }

/* ---- AI key warning ---- */
.key-warn {
  background: #2a1503; border: 1px solid var(--amber); color: #ffd9a0;
  border-radius: 8px; padding: 1rem 1.2rem; margin: 1rem 0; font-size: .92rem;
}
.key-warn code { color: #fff; background: #00000055; padding: .1rem .35rem; border-radius: 4px; }

/* ---- wheel grid ---- */
.filters { display: flex; flex-wrap: wrap; gap: .6rem; margin: 1rem 0; }
.filters select, .filters input { padding: .55rem .7rem; border-radius: 6px; border: 1px solid var(--line); background: var(--bg2); color: var(--text); font-family: inherit; font-size: .9rem; }
.wheel-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1rem; }
.wheel-card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 1.1rem; cursor: pointer; transition: border-color .15s, transform .15s; }
.wheel-card:hover { border-color: var(--amber); }
.wheel-card.selected { border: 2px solid var(--amber); transform: translateY(-2px); }
.wheel-card h3 { margin: 0 0 .3rem; font-size: 1.05rem; }
.wheel-card .brand { color: var(--amber); font-family: 'Oswald'; font-size: .8rem; letter-spacing: .08em; text-transform: uppercase; }
.wheel-specs { color: var(--muted); font-size: .88rem; margin: .5rem 0; }
.price-note { font-size: .85rem; color: var(--silver); font-style: italic; }
.vehicle-strip { display: flex; gap: 1rem; align-items: center; background: var(--bg2); border: 1px solid var(--line); border-radius: 8px; padding: .6rem .9rem; }
.vehicle-strip img { width: 96px; height: 64px; object-fit: cover; border-radius: 6px; }

/* ---- design result ---- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 640px) { .compare { grid-template-columns: 1fr; } }
.compare figure { margin: 0; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.compare figcaption { padding: .6rem .9rem; font-family: 'Oswald'; text-transform: uppercase; font-size: .85rem; letter-spacing: .06em; }
.compare img { display: block; width: 100%; }
.tag-ai { background: var(--amber); color: #111; font-size: .7rem; padding: .15rem .5rem; border-radius: 4px; font-weight: 700; margin-left: .5rem; }
.disclaimer { background: var(--bg2); border: 1px dashed var(--line); border-radius: 8px; padding: .9rem 1.1rem; color: var(--muted); font-size: .88rem; margin-top: 1.2rem; }

/* ---- spinner / loading ---- */
.spinner { display: inline-block; width: 1.1em; height: 1.1em; border: 3px solid #ffffff55; border-top-color: #111; border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -0.2em; margin-right: .5em; }
@keyframes spin { to { transform: rotate(360deg); } }
.loading-panel { text-align: center; padding: 2.5rem 1rem; }
.loading-panel .big { font-family: 'Oswald'; font-size: 1.3rem; margin: 1rem 0 .5rem; }
.loading-panel p { color: var(--muted); }

/* ---- garage ---- */
.garage-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1rem; }
.garage-card { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; text-decoration: none; color: inherit; }
.garage-card img { display: block; width: 100%; height: 150px; object-fit: cover; }
.garage-card .body { padding: .8rem 1rem; }
.garage-card h3 { margin: 0 0 .2rem; font-size: 1rem; }
.garage-card p { margin: 0; color: var(--muted); font-size: .85rem; }
.badge { display: inline-block; font-size: .72rem; font-weight: 700; padding: .15rem .55rem; border-radius: 999px; text-transform: uppercase; }
.badge.done { background: #052e16; color: #4ade80; }
.badge.failed { background: #3f0d0d; color: #f87171; }
.badge.pending { background: #2a2203; color: #fbbf24; }

.footer { text-align: center; padding: 1.6rem 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; margin-top: 2rem; }
.footer .muted { color: #71717a; font-size: .8rem; }
.muted { color: var(--muted); }
.mt { margin-top: 1.2rem; }
.center { text-align: center; }

/* ---- Phase 2: before/after slider ---- */
.ba-slider { position: relative; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); user-select: none; }
.ba-img { display: block; width: 100%; height: auto; }
.ba-before { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; clip-path: inset(0 50% 0 0); }
.ba-divider { position: absolute; top: 0; bottom: 0; left: 50%; width: 3px; background: var(--amber); transform: translateX(-50%); pointer-events: none; }
.ba-range { position: absolute; inset: 0; width: 100%; opacity: 0; cursor: ew-resize; margin: 0; }
.ba-tag { position: absolute; top: .6rem; font-family: 'Oswald'; font-size: .75rem; letter-spacing: .08em; text-transform: uppercase; background: #000000aa; color: #fff; padding: .2rem .6rem; border-radius: 4px; pointer-events: none; }
.ba-tag-before { left: .6rem; }
.ba-tag-after { right: .6rem; }

/* ---- Phase 2: suspension picker ---- */
.susp-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: .7rem; }
.susp-card { display: flex; align-items: center; gap: .6rem; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: .9rem 1rem; cursor: pointer; transition: border-color .15s; }
.susp-card:hover { border-color: var(--amber); }
.susp-card.current { border: 2px solid var(--amber); }
.susp-card input { accent-color: var(--amber); width: 1.1rem; height: 1.1rem; }
.susp-label { font-family: 'Oswald'; font-size: 1rem; }

/* ---- Phase 2: misc ---- */
.btn-row { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: .8rem; }
.center { text-align: center; }

/* ---- Custom wheels (typed specs / uploaded photo) ---- */
.stack-form input { display: block; width: 100%; margin: .4rem 0; padding: .55rem .7rem; border-radius: 6px; border: 1px solid var(--line); background: var(--bg2); color: var(--text); font-family: inherit; font-size: .9rem; box-sizing: border-box; }
.stack-form h4 { margin: 0 0 .3rem; }