:root {
  color-scheme: dark;
  --ink: #eef5f6;
  --ink-soft: #b6c5c9;
  --muted: #7f9298;
  --bg: #0b1116;
  --surface: #101820;
  --surface-2: #162129;
  --surface-3: #1b2932;
  --line: #2a3a43;
  --line-strong: #3c5059;
  --cyan: #57c7d4;
  --cyan-soft: #183c43;
  --amber: #e9a23b;
  --amber-soft: #432f17;
  --red: #f06464;
  --green: #65cf91;
  --header-height: 76px;
  --header-total: calc(var(--header-height) + env(safe-area-inset-top, 0px));
  --rail-width: 340px;
  --radius: 12px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { min-width: 320px; background: var(--bg); }

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  overscroll-behavior-y: none;
  -webkit-tap-highlight-color: transparent;
  color: var(--ink);
  background:
    linear-gradient(rgba(87, 199, 212, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(87, 199, 212, 0.025) 1px, transparent 1px),
    var(--bg);
  background-size: 28px 28px;
}

button, input, select { font: inherit; }
button { color: inherit; }

.skip-link {
  position: fixed;
  top: -100px;
  left: 1rem;
  z-index: 100;
  padding: .7rem 1rem;
  border-radius: 0 0 8px 8px;
  color: #061013;
  background: var(--cyan);
}
.skip-link:focus { top: 0; }

.app-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 30;
  height: var(--header-total);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: env(safe-area-inset-top, 0px) max(1.25rem, env(safe-area-inset-right, 0px)) 0 max(1.25rem, env(safe-area-inset-left, 0px));
  border-bottom: 1px solid var(--line);
  background: rgba(11, 17, 22, .95);
  backdrop-filter: blur(14px);
}

.brand-lockup, .header-actions { display: flex; align-items: center; gap: .8rem; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  color: var(--cyan);
  background: var(--surface-2);
}
.brand-mark svg { width: 34px; height: 34px; }
.eyebrow {
  display: block;
  margin-bottom: .2rem;
  color: var(--muted);
  font-size: .67rem;
  font-weight: 750;
  letter-spacing: .14em;
  text-transform: uppercase;
}
h1, h2, p { margin: 0; }
h1 { font-size: clamp(1.05rem, 2vw, 1.38rem); letter-spacing: -.02em; }
h1 span { color: var(--amber); font-size: .78em; letter-spacing: .08em; }
h2 { font-size: 1.12rem; letter-spacing: -.01em; }

.button, .icon-button, .text-button {
  border: 0;
  cursor: pointer;
  transition: background-color .16s ease, border-color .16s ease, color .16s ease, transform .16s ease;
}
.button:focus-visible, .icon-button:focus-visible, .text-button:focus-visible,
input:focus-visible, select:focus-visible, summary:focus-visible, .tab-button:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}
.button {
  min-height: 40px;
  padding: .58rem .9rem;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: .82rem;
  font-weight: 750;
}
.button:hover:not(:disabled) { transform: translateY(-1px); }
.button:disabled { cursor: not-allowed; opacity: .42; }
.button-primary { color: #081214; background: var(--cyan); }
.button-primary:hover:not(:disabled) { background: #79d6df; }
.button-quiet { color: var(--ink-soft); border-color: var(--line-strong); background: var(--surface-2); }
.button-quiet:hover:not(:disabled) { color: var(--ink); border-color: var(--cyan); }
.button-wide { width: 100%; }
.icon-button {
  min-width: 36px;
  height: 36px;
  padding: 0 .55rem;
  border: 1px solid var(--line-strong);
  border-radius: 7px;
  background: var(--surface-2);
}
.text-button { padding: .3rem; color: var(--cyan); background: transparent; font-size: .78rem; font-weight: 700; }

.state-chip {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .42rem .65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: var(--surface);
  font-size: .75rem;
  white-space: nowrap;
}
.state-chip i { width: 7px; height: 7px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 0 3px rgba(233, 162, 59, .12); }
.state-chip.ready i { background: var(--green); box-shadow: 0 0 0 3px rgba(101, 207, 145, .12); }
.state-chip.error i { background: var(--red); box-shadow: 0 0 0 3px rgba(240, 100, 100, .12); }

.app-layout { display: grid; grid-template-columns: var(--rail-width) minmax(0, 1fr); padding-top: var(--header-total); min-height: 100vh; min-height: 100dvh; }
.control-rail {
  position: fixed;
  z-index: 20;
  top: var(--header-total);
  bottom: 0;
  left: 0;
  width: var(--rail-width);
  overflow: auto;
  border-right: 1px solid var(--line);
  background: var(--surface);
  scrollbar-color: var(--line-strong) transparent;
}
.rail-heading { display: flex; justify-content: space-between; align-items: center; padding: 1.1rem 1rem .4rem; }
.rail-copy { padding: 0 1rem 1rem; color: var(--muted); font-size: .78rem; line-height: 1.5; }
#parameter-form { padding: 0 .7rem 6.8rem; }

.parameter-group { margin-bottom: .55rem; border: 1px solid var(--line); border-radius: 9px; background: #0e161c; overflow: clip; }
.parameter-group summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: .65rem .75rem;
  cursor: pointer;
  list-style: none;
  color: var(--ink-soft);
  font-size: .78rem;
  font-weight: 750;
  letter-spacing: .04em;
}
.parameter-group summary::-webkit-details-marker { display: none; }
.parameter-group summary::after { content: "+"; color: var(--muted); font-size: 1rem; font-weight: 400; }
.parameter-group[open] summary { color: var(--ink); border-bottom: 1px solid var(--line); }
.parameter-group[open] summary::after { content: "−"; color: var(--cyan); }
.field-list { display: grid; gap: .55rem; padding: .7rem; }
.field-row { display: grid; grid-template-columns: minmax(0, 1fr) 112px; gap: .65rem; align-items: center; }
.field-row label { color: var(--ink-soft); font-size: .75rem; line-height: 1.25; }
.field-control { position: relative; }
.field-control input, .field-control select, .animation-controls select {
  width: 100%;
  min-height: 34px;
  padding: .38rem .48rem;
  border: 1px solid var(--line-strong);
  border-radius: 6px;
  color: var(--ink);
  background: var(--surface-2);
  font-size: .78rem;
}
.field-control.has-unit input { padding-right: 2.9rem; }
.field-control .unit { position: absolute; right: .48rem; top: 50%; transform: translateY(-50%); color: var(--muted); font-size: .65rem; pointer-events: none; }
.rail-run { position: sticky; bottom: 0; padding: .75rem 1rem max(.85rem, env(safe-area-inset-bottom, 0px)); border-top: 1px solid var(--line); background: rgba(16, 24, 32, .96); backdrop-filter: blur(10px); }
.rail-run p { margin-top: .42rem; color: var(--muted); font-size: .67rem; text-align: center; }

.workspace { grid-column: 2; min-width: 0; padding: 1.15rem max(clamp(.8rem, 2vw, 1.5rem), env(safe-area-inset-right, 0px)) max(2rem, env(safe-area-inset-bottom, 0px)) max(clamp(.8rem, 2vw, 1.5rem), env(safe-area-inset-left, 0px)); }
.summary-strip { display: grid; grid-template-columns: repeat(5, minmax(130px, 1fr)); gap: .65rem; margin-bottom: 1rem; }
.summary-strip article { min-height: 86px; padding: .8rem .9rem; border: 1px solid var(--line); border-top: 2px solid var(--line-strong); border-radius: 9px; background: var(--surface); }
.summary-strip article:first-child { border-top-color: var(--cyan); }
.summary-strip .summary-status { border-top-color: var(--amber); }
.summary-strip span, .summary-strip small { display: block; color: var(--muted); font-size: .67rem; }
.summary-strip strong { display: inline-block; margin: .28rem .2rem .1rem 0; font-family: "SFMono-Regular", Consolas, monospace; font-size: 1.35rem; font-weight: 650; letter-spacing: -.04em; }
.summary-strip small { display: inline; }
.summary-status strong { letter-spacing: .02em; font-size: 1rem; }
.summary-status small { display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.analysis-tabs {
  display: flex;
  gap: .2rem;
  overflow-x: auto;
  padding: .25rem 0 .65rem;
  scrollbar-width: thin;
  scrollbar-color: var(--line-strong) transparent;
}
.tab-button {
  flex: 0 0 auto;
  padding: .55rem .72rem;
  border: 0;
  border-bottom: 2px solid transparent;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font-size: .75rem;
  font-weight: 700;
  white-space: nowrap;
}
.tab-button:hover { color: var(--ink); }
.tab-button.active { color: var(--cyan); border-bottom-color: var(--cyan); }

.view-shell { min-height: calc(100vh - 242px); min-height: calc(100dvh - 242px); border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden; }
.view-heading { display: flex; align-items: end; justify-content: space-between; gap: 1rem; min-height: 72px; padding: .9rem 1rem; border-bottom: 1px solid var(--line); }
.view-heading p { max-width: 620px; color: var(--muted); font-size: .75rem; line-height: 1.45; text-align: right; }
.view-content { min-height: 560px; padding: .8rem; }
.notice { display: none; align-items: center; justify-content: center; gap: .65rem; min-height: 54px; color: var(--ink-soft); border-bottom: 1px solid var(--line); background: var(--surface-2); font-size: .78rem; }
.notice.visible { display: flex; }
.notice.error { color: #ffc6c6; background: #321c20; }
.notice-spinner { width: 16px; height: 16px; border: 2px solid var(--line-strong); border-top-color: var(--cyan); border-radius: 50%; animation: spin .8s linear infinite; }
.notice.error .notice-spinner { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state { display: grid; place-items: center; min-height: 500px; text-align: center; }
.empty-state svg { width: 82px; color: var(--line-strong); }
.empty-state h3 { margin: 1rem 0 .3rem; font-size: 1rem; }
.empty-state p { color: var(--muted); font-size: .8rem; }
.analysis-cta { max-width: 540px; margin: 7rem auto; padding: 1.4rem; border: 1px solid var(--line); border-radius: 10px; background: var(--surface-2); text-align: center; }
.analysis-cta h3 { margin: 0 0 .45rem; }
.analysis-cta p { margin: 0 0 1rem; color: var(--muted); font-size: .8rem; line-height: 1.55; }

.chart-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: .7rem; }
.chart-card { min-width: 0; height: 300px; padding: .65rem; border: 1px solid var(--line); border-radius: 9px; background: #0d151b; }
.chart-card.wide { grid-column: 1 / -1; }
.chart-card h3 { margin: 0 0 .35rem; color: var(--ink-soft); font-size: .75rem; font-weight: 700; }
.chart-card canvas { display: block; width: 100%; height: calc(100% - 24px); }
.diagnostic-notes { grid-column: 1 / -1; padding: 1rem; border: 1px solid var(--line); border-radius: 9px; background: #0d151b; }
.diagnostic-notes pre { margin: 0; color: var(--ink-soft); font: .72rem/1.55 "SFMono-Regular", Consolas, monospace; white-space: pre-wrap; }

.animation-stage { position: relative; min-height: 650px; border: 1px solid var(--line); border-radius: 9px; background: #091015; overflow: hidden; }
.vehicle-canvas { display: block; width: 100%; height: 590px; touch-action: none; }
.animation-hud { position: absolute; top: 1rem; left: 1rem; min-width: 185px; padding: .65rem .75rem; border: 1px solid rgba(87, 199, 212, .28); border-radius: 7px; color: var(--ink-soft); background: rgba(9, 16, 21, .82); backdrop-filter: blur(8px); font: .7rem/1.55 "SFMono-Regular", Consolas, monospace; pointer-events: none; }
.animation-controls { display: grid; grid-template-columns: auto auto 120px minmax(120px, 1fr) auto auto; align-items: center; gap: .55rem; min-height: 58px; padding: .55rem .7rem; border-top: 1px solid var(--line); background: var(--surface-2); }
.animation-controls label { display: flex; align-items: center; gap: .4rem; color: var(--muted); font-size: .72rem; }
.animation-controls output { color: var(--ink-soft); font: .72rem "SFMono-Regular", Consolas, monospace; }
.time-scrubber { accent-color: var(--cyan); }
.zoom-controls { display: flex; gap: .25rem; }
.zoom-fit { min-width: 42px; font-size: .7rem; }

.heatmap-card { height: 590px; }
.heatmap-card canvas { height: calc(100% - 24px); }
.mode-table { width: 100%; border-collapse: collapse; font-size: .74rem; }
.mode-table th, .mode-table td { padding: .48rem .6rem; border-bottom: 1px solid var(--line); text-align: right; }
.mode-table th:first-child, .mode-table td:first-child { text-align: left; }
.mode-table th { color: var(--muted); font-weight: 650; }

.install-tip {
  position: fixed;
  z-index: 60;
  right: max(1rem, env(safe-area-inset-right, 0px));
  bottom: max(1rem, env(safe-area-inset-bottom, 0px));
  left: max(1rem, env(safe-area-inset-left, 0px));
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr) 34px;
  align-items: center;
  gap: .7rem;
  max-width: 430px;
  margin-inline: auto;
  padding: .72rem;
  border: 1px solid var(--line-strong);
  border-radius: 13px;
  background: rgba(22, 33, 41, .97);
  box-shadow: 0 18px 45px rgba(0, 0, 0, .45);
  backdrop-filter: blur(16px);
}
.install-tip[hidden] { display: none; }
.install-tip-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 10px; color: var(--cyan); background: var(--cyan-soft); }
.install-tip-icon svg { width: 23px; height: 23px; }
.install-tip strong, .install-tip span { display: block; }
.install-tip strong { font-size: .82rem; }
.install-tip span { margin-top: .18rem; color: var(--ink-soft); font-size: .72rem; line-height: 1.35; }
.install-tip button { width: 34px; height: 34px; border: 0; border-radius: 7px; color: var(--ink-soft); background: transparent; font-size: 1.45rem; cursor: pointer; }
.install-tip button:hover { background: var(--surface-3); }

.mobile-only { display: none; }

@media (max-width: 1180px) {
  :root { --rail-width: 310px; }
  .summary-strip { grid-template-columns: repeat(3, 1fr); }
  .summary-strip article { min-height: 76px; }
  .summary-strip article:nth-child(4), .summary-strip article:nth-child(5) { grid-column: span 1; }
}

@media (max-width: 860px) {
  .mobile-only { display: inline-grid; place-items: center; }
  .app-header { padding: env(safe-area-inset-top, 0px) max(.7rem, env(safe-area-inset-right, 0px)) 0 max(.7rem, env(safe-area-inset-left, 0px)); }
  .brand-mark { display: none; }
  .header-actions .state-chip, .header-actions .button-quiet { display: none; }
  .app-layout { display: block; }
  .control-rail { transform: translateX(-105%); transition: transform .2s ease; box-shadow: 18px 0 40px rgba(0,0,0,.45); }
  .control-rail.open { transform: translateX(0); }
  .rail-scrim { position: fixed; z-index: 15; inset: var(--header-total) 0 0; background: rgba(0,0,0,.55); }
  .workspace { padding: .8rem max(.8rem, env(safe-area-inset-right, 0px)) max(.8rem, env(safe-area-inset-bottom, 0px)) max(.8rem, env(safe-area-inset-left, 0px)); }
  .chart-grid { grid-template-columns: 1fr; }
  .chart-card.wide { grid-column: auto; }
  .view-heading { align-items: start; flex-direction: column; }
  .view-heading p { text-align: left; }
  .animation-controls { grid-template-columns: auto auto 1fr auto; }
  .animation-controls label { display: none; }
  .time-scrubber { grid-column: 1 / -1; grid-row: 2; }
  .zoom-controls { grid-column: 4; grid-row: 1; }
}

@media (max-width: 580px) {
  :root { --header-height: 68px; --rail-width: min(90vw, 340px); }
  .eyebrow { font-size: .58rem; }
  h1 { font-size: .95rem; }
  .button, .icon-button { min-height: 44px; }
  .icon-button { height: 44px; }
  .header-actions .button { min-height: 44px; padding: .45rem .65rem; font-size: .72rem; }
  .field-row { grid-template-columns: minmax(0, 1fr) 126px; }
  .field-control input, .field-control select, .animation-controls select { min-height: 44px; font-size: 16px; }
  .summary-strip { grid-template-columns: repeat(2, 1fr); }
  .summary-strip article:last-child { grid-column: 1 / -1; }
  .view-content { padding: .5rem; }
  .chart-card { height: 260px; }
  .animation-stage { min-height: 560px; }
  .vehicle-canvas { height: 500px; }
  .zoom-controls { display: none; }
  .animation-controls { grid-template-columns: auto auto 1fr; }
  .analysis-tabs { scroll-snap-type: x proximity; -webkit-overflow-scrolling: touch; }
  .tab-button { min-height: 44px; scroll-snap-align: start; }
  .time-scrubber { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .001ms !important; transition-duration: .001ms !important; }
}