/* ============================================================================
   MotorBench - "Precision Instrument" design system.
   Aesthetic: motorsport telemetry / high-end gauge cluster. Carbon black,
   one hot signal-amber accent, engineered grotesk + technical mono, a faint
   instrument grid, and readouts that animate like an instrument coming alive.
   Vanilla CSS, zero framework, fast. Fonts: Archivo + IBM Plex Mono.
   ========================================================================== */

:root {
  /* surfaces */
  --carbon:    #0b0d0f;
  --carbon-2:  #14181b;
  --carbon-3:  #1b2127;
  --hair:      rgba(255, 255, 255, 0.07);
  --hair-2:    rgba(255, 255, 255, 0.13);

  /* ink */
  --ink:       #f5f7f8;
  --ink-dim:   #97a2a9;
  --ink-faint: #5f696f;

  /* accent + signals */
  --amber:     #ffc02e;
  --amber-2:   #ffd470;
  --glow:      rgba(255, 192, 46, 0.30);
  --pos:       #54d18d;
  --neg:       #ff6f61;

  --radius:    14px;
  --maxw:      940px;
  --ease:      cubic-bezier(0.22, 1, 0.36, 1);

  --display: "Archivo", system-ui, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "Cascadia Code", monospace;
  --body:    "Archivo", system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--body);
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  background-color: var(--carbon);
  /* atmosphere: amber glow up top + faint telemetry grid (not a flat fill) */
  background-image:
    radial-gradient(1100px 520px at 50% -8%, rgba(255, 192, 46, 0.07), transparent 62%),
    linear-gradient(rgba(255, 255, 255, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.022) 1px, transparent 1px);
  background-size: 100% 100%, 46px 46px, 46px 46px;
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

a { color: var(--amber); text-decoration: none; transition: color 0.15s; }
a:hover { color: var(--amber-2); }

::selection { background: var(--amber); color: #1a1205; }

/* ── Typography ──────────────────────────────────────────────────────────── */
h1, h2, h3 { font-family: var(--display); font-weight: 800; line-height: 1.08; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.3rem, 6vw, 3.7rem); }
h2 { font-size: clamp(1.5rem, 3.5vw, 2rem); margin: 2em 0 0.7em; letter-spacing: -0.015em; }
h3 { font-size: 1.2rem; font-weight: 700; }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  gap: 9px;
}
.eyebrow::before { content: "//"; opacity: 0.55; }

.lede { font-size: clamp(1.05rem, 2.2vw, 1.22rem); color: var(--ink-dim); max-width: 56ch; margin-top: 0.9em; }

/* ── Header ──────────────────────────────────────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(11, 13, 15, 0.72);
  backdrop-filter: blur(14px) saturate(1.4);
  border-bottom: 1px solid var(--hair);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; height: 66px; }

.brand {
  display: inline-flex; align-items: center; gap: 11px;
  font-family: var(--display); font-weight: 800; font-size: 1.32rem;
  letter-spacing: -0.03em; color: var(--ink); text-transform: none;
}
.brand:hover { color: var(--ink); }
.brand .dot { color: var(--amber); }
.brand-mark { width: 28px; height: 28px; flex: none; filter: drop-shadow(0 0 6px var(--glow)); }

.nav { display: flex; gap: 8px; }
.nav a {
  font-family: var(--mono); font-size: 0.8rem; font-weight: 500;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--ink-dim); padding: 7px 12px; border-radius: 8px;
  transition: color 0.15s, background 0.15s;
}
.nav a:hover { color: var(--amber); background: var(--carbon-2); }

/* ── Hero (staggered reveal) ─────────────────────────────────────────────── */
.hero { padding: 70px 0 30px; }
.hero > * { opacity: 0; animation: rise 0.7s var(--ease) forwards; }
.hero > *:nth-child(1) { animation-delay: 0.05s; }
.hero > *:nth-child(2) { animation-delay: 0.14s; }
.hero > *:nth-child(3) { animation-delay: 0.23s; }
@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: none; } }

/* ── Tool card ───────────────────────────────────────────────────────────── */
.tool {
  position: relative;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.025), transparent 30%),
    var(--carbon-2);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  padding: 26px;
  margin: 28px 0;
  box-shadow: 0 24px 60px -30px rgba(0, 0, 0, 0.8);
}
/* hot hairline along the top edge */
.tool::before {
  content: ""; position: absolute; top: -1px; left: 22px; right: 22px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
  opacity: 0.7;
}

.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 580px) { .tool-grid { grid-template-columns: 1fr; } }

label {
  display: block;
  font-family: var(--mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.13em; text-transform: uppercase;
  color: var(--ink-dim); margin-bottom: 9px;
}
.hint { font-family: var(--body); letter-spacing: 0; text-transform: none; color: var(--ink-faint); font-size: 0.8rem; font-weight: 400; }

input[type="text"], input[type="number"], select {
  width: 100%;
  background: var(--carbon);
  border: 1px solid var(--hair-2);
  border-radius: 10px;
  color: var(--ink);
  font-family: var(--mono); font-size: 1.1rem; font-weight: 500;
  letter-spacing: 0.02em;
  padding: 13px 15px;
  transition: border-color 0.18s, box-shadow 0.18s, background 0.18s;
}
input::placeholder { color: var(--ink-faint); }
input:focus, select:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 4px var(--glow);
  background: #0e1113;
}
input.invalid { border-color: var(--neg); box-shadow: 0 0 0 4px rgba(255, 111, 97, 0.18); }

.field-row { display: flex; gap: 14px; align-items: end; flex-wrap: wrap; }
.field-row > div { flex: 1; min-width: 130px; }

.controls { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 22px; }

.btn {
  position: relative;
  font-family: var(--display); font-weight: 800; font-size: 1.02rem;
  letter-spacing: 0.02em; text-transform: uppercase;
  color: #1a1205;
  background: linear-gradient(180deg, var(--amber-2), var(--amber));
  border: none; border-radius: 10px;
  padding: 14px 32px; cursor: pointer;
  box-shadow: 0 8px 24px -8px var(--glow);
  transition: transform 0.08s, box-shadow 0.2s, filter 0.2s;
}
.btn:hover { filter: brightness(1.06); box-shadow: 0 12px 30px -8px var(--glow); }
.btn:active { transform: translateY(1px) scale(0.99); }

.swap-btn {
  font-family: var(--mono); font-size: 0.78rem; font-weight: 500;
  letter-spacing: 0.06em; text-transform: uppercase;
  background: var(--carbon-3); color: var(--ink-dim);
  border: 1px solid var(--hair-2); border-radius: 9px;
  padding: 11px 16px; cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.swap-btn:hover { color: var(--amber); border-color: var(--amber); }

input[type="radio"] { accent-color: var(--amber); width: auto; }

/* ── Results ─────────────────────────────────────────────────────────────── */
.result { margin-top: 28px; }
.result:not(:empty) { animation: rise 0.5s var(--ease); }

.readout {
  position: relative;
  background:
    radial-gradient(140% 100% at 0% 0%, rgba(255, 192, 46, 0.06), transparent 55%),
    var(--carbon-3);
  border: 1px solid var(--hair-2);
  border-left: 3px solid var(--amber);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 18px;
}
.readout.warn { border-left-color: var(--neg); }
.readout.ok   { border-left-color: var(--pos); }
.readout .rlabel {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-dim);
}
.readout .rbig {
  font-family: var(--mono); font-weight: 600;
  font-size: clamp(2rem, 7vw, 3rem); line-height: 1.05; letter-spacing: -0.02em;
  margin: 4px 0 2px; font-variant-numeric: tabular-nums;
}
.readout .rbig .amber { color: var(--amber); }
.readout .rbig .pos { color: var(--pos); }
.readout .rbig .neg { color: var(--neg); }
.readout .rsub { color: var(--ink-dim); font-size: 0.98rem; margin-top: 8px; }
.readout .rsub strong { color: var(--ink); font-family: var(--mono); font-weight: 600; }

/* deviation gauge - the signature instrument element */
.gauge { margin: 20px 0 4px; }
.gauge-track {
  position: relative; height: 10px; border-radius: 6px;
  background:
    linear-gradient(90deg,
      rgba(255,111,97,0.85) 0%, rgba(255,111,97,0.3) 22%,
      rgba(84,209,141,0.55) 50%,
      rgba(255,111,97,0.3) 78%, rgba(255,111,97,0.85) 100%);
  border: 1px solid var(--hair-2);
}
.gauge-mid { position: absolute; top: -3px; bottom: -3px; left: 50%; width: 1px; background: var(--hair-2); }
.gauge-needle {
  position: absolute; top: -6px; width: 3px; height: 22px; border-radius: 3px;
  background: var(--ink); box-shadow: 0 0 10px rgba(0,0,0,0.6);
  transform: translateX(-50%);
  transition: left 0.7s var(--ease);
}
.gauge-labels {
  display: flex; justify-content: space-between; margin-top: 9px;
  font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.08em; color: var(--ink-faint);
}

.flags { display: flex; flex-wrap: wrap; gap: 8px; margin: 4px 0 6px; }
.flag {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 0.82rem; font-weight: 500; letter-spacing: 0.02em;
  padding: 8px 13px; border-radius: 8px; border: 1px solid transparent;
}
.flag.ok   { background: rgba(84, 209, 141, 0.1);  color: var(--pos); border-color: rgba(84,209,141,0.25); }
.flag.warn { background: rgba(255, 111, 97, 0.1);  color: var(--neg); border-color: rgba(255,111,97,0.25); }
.flag.info { background: rgba(255, 192, 46, 0.1);  color: var(--amber); border-color: rgba(255,192,46,0.22); }

table.compare, .speed-table {
  width: 100%; border-collapse: collapse; margin: 20px 0;
  font-family: var(--mono); font-variant-numeric: tabular-nums; font-size: 0.92rem;
}
table.compare th, table.compare td, .speed-table th, .speed-table td {
  padding: 12px 13px; text-align: right; border-bottom: 1px solid var(--hair);
}
table.compare th:first-child, table.compare td:first-child { text-align: left; color: var(--ink-dim); font-weight: 400; }
table.compare thead th {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--amber); font-weight: 500; vertical-align: bottom;
}
table.compare tbody tr { transition: background 0.12s; }
table.compare tbody tr:hover { background: rgba(255, 255, 255, 0.02); }
.delta-pos { color: var(--pos); }
.delta-neg { color: var(--neg); }

.speed-table { margin-top: 12px; }
.speed-table th, .speed-table td { text-align: center; }
.speed-table th { font-size: 0.7rem; letter-spacing: 0.06em; color: var(--ink-faint); text-transform: uppercase; }
.speed-table td:first-child, .speed-table th:first-child { text-align: left; color: var(--ink-dim); }
.result h3 { font-family: var(--mono); font-size: 0.8rem; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-dim); margin: 26px 0 0; }

/* ── Prose / content ─────────────────────────────────────────────────────── */
.prose { max-width: 64ch; }
.prose p, .prose li { color: var(--ink-dim); margin-bottom: 0.9em; }
.prose li { margin-bottom: 0.5em; }
.prose ul { padding-left: 1.2em; }
.prose strong { color: var(--ink); }
.prose em { color: var(--ink); font-style: normal; border-bottom: 1px solid var(--amber); }

details.faq { border-bottom: 1px solid var(--hair); }
details.faq summary {
  cursor: pointer; list-style: none; padding: 16px 0;
  font-family: var(--display); font-weight: 700; font-size: 1.06rem; color: var(--ink);
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; font-family: var(--mono); color: var(--amber); font-size: 1.3rem; transition: transform 0.2s; }
details.faq[open] summary::after { transform: rotate(45deg); }
details.faq[open] summary { color: var(--amber); }
details.faq p { padding-bottom: 16px; }

.disclaimer {
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.65;
  color: var(--ink-faint); background: var(--carbon-2);
  border: 1px solid var(--hair); border-radius: 10px; padding: 16px 18px; margin: 26px 0;
}

.crumbs { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.04em; color: var(--ink-faint); margin: 22px 0 0; text-transform: uppercase; }
.crumbs a { color: var(--ink-dim); }

/* ── Homepage tool grid ──────────────────────────────────────────────────── */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(255px, 1fr)); gap: 18px; margin: 30px 0; }
.card {
  position: relative; display: block; overflow: hidden;
  background: linear-gradient(180deg, rgba(255,255,255,0.025), transparent 40%), var(--carbon-2);
  border: 1px solid var(--hair); border-radius: var(--radius);
  padding: 22px; color: var(--ink);
  opacity: 0; animation: rise 0.6s var(--ease) forwards;
  transition: transform 0.25s var(--ease), border-color 0.25s, box-shadow 0.25s;
}
.cards .card:nth-child(1) { animation-delay: 0.10s; }
.cards .card:nth-child(2) { animation-delay: 0.16s; }
.cards .card:nth-child(3) { animation-delay: 0.22s; }
.cards .card:nth-child(4) { animation-delay: 0.28s; }
.cards .card:nth-child(5) { animation-delay: 0.34s; }
.cards .card:nth-child(6) { animation-delay: 0.40s; }
.card:not(.soon):hover { transform: translateY(-4px); border-color: var(--amber); box-shadow: 0 20px 40px -22px var(--glow); }
.card:not(.soon):hover::after {
  content: ""; position: absolute; top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--amber), transparent);
}
.card h3 { margin: 12px 0 7px; letter-spacing: -0.01em; }
.card p { margin: 0; color: var(--ink-faint); font-size: 0.92rem; }
.card.soon { opacity: 0.42; }
.tag { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--amber); font-weight: 600; }
.tag.soon { color: var(--ink-faint); }

/* ── Footer ──────────────────────────────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--hair); margin-top: 72px; padding: 38px 0; }
.site-footer p { color: var(--ink-faint); font-size: 0.88rem; margin-bottom: 6px; }
.site-footer a { color: var(--ink-dim); }

.visually-hidden { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ── Reduced motion ──────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .hero > *, .card { opacity: 1 !important; }
}