:root {
  --bg: #050505;
  --bg-2: #0b0b0b;
  --card: #111111;
  --card-2: #171717;
  --line: rgba(255, 255, 255, 0.1);
  --text: #f4f4ef;
  --muted: #8e8e86;
  --dim: #5b5b55;
  --accent: #e8ff47;
  --accent-ink: #101400;
  --max: 1180px;
  --pad: clamp(1.1rem, 4vw, 2.4rem);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, "Segoe UI", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.5;
}
img, video { max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
h1, h2, h3, .display {
  font-family: "Inter Tight", Inter, sans-serif;
  letter-spacing: -0.04em;
  font-weight: 600;
  margin: 0;
}
h4 {
  font-family: "Inter Tight", Inter, sans-serif;
  font-size: 0.98rem;
  letter-spacing: -0.02em;
  margin: 0;
}

.skip {
  position: absolute;
  left: -999px;
  top: 0;
}
.skip:focus { left: 1rem; top: 1rem; z-index: 50; background: #fff; color: #000; padding: .4rem .7rem; }

.wrap {
  width: min(var(--max), calc(100% - 2 * var(--pad)));
  margin: 0 auto;
}

.nav {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(5, 5, 5, 0.86);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 64px;
}
.brand {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  letter-spacing: -0.03em;
  font-size: 1.05rem;
}
.brand em {
  font-style: normal;
  color: var(--accent);
}
.nav-links {
  display: flex;
  gap: 1.35rem;
  color: var(--muted);
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }
.lang-switch {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  border: 0;
  background: none;
}
.lang-switch button {
  appearance: none;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.38rem 0.85rem;
  font-size: 0.86rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  cursor: pointer;
}
.lang-switch button:hover { color: var(--text); }
.lang-switch button.active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}
.lang-switch button.active:hover {
  color: var(--accent-ink);
  filter: brightness(1.05);
}

.kicker {
  display: inline-block;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.hero { padding: 4.2rem 0 2.4rem; }
.hero h1 {
  font-size: clamp(3.2rem, 10vw, 6.6rem);
  line-height: 0.9;
  margin-bottom: 1.15rem;
}
.lead {
  max-width: 42rem;
  color: var(--muted);
  font-size: 1.08rem;
  line-height: 1.6;
}
.lead a { color: var(--text); border-bottom: 1px solid var(--line); }
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}
.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.42rem 0.95rem;
  font-size: 0.86rem;
  color: #d2d2ca;
}

.section { padding: 3.6rem 0 1rem; }
.section h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  margin-bottom: 0.7rem;
}
.section .lead { margin-bottom: 0; }

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-top: 1.6rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.25rem 1.3rem 1.4rem;
}
.card h3 { font-size: 1.08rem; margin-bottom: 0.5rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.94rem; line-height: 1.55; }
.num {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--dim);
  margin-bottom: 0.35rem;
}

.eco {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.2rem;
  margin-top: 1.8rem;
  align-items: start;
}
.eco-nav { display: grid; gap: 0.15rem; }
.eco-nav button {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--muted);
  text-align: left;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
  display: flex;
  gap: 0.85rem;
  font-size: 1rem;
}
.eco-nav button .idx {
  font-family: "Inter Tight", sans-serif;
  color: var(--dim);
  width: 1.6rem;
}
.eco-nav button.active { color: var(--text); }
.eco-nav button.active .idx { color: var(--accent); }
.eco-panel h3 { font-size: 1.7rem; margin: 0.15rem 0 0.7rem; }
.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
  margin-top: 1.2rem;
}
.list { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.list li {
  position: relative;
  padding: 0.5rem 0 0.5rem 1.05rem;
  color: var(--muted);
  font-size: 0.94rem;
  border-bottom: 1px solid var(--line);
}
.list li::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 99px;
  position: absolute;
  left: 0;
  top: 0.9rem;
}
.who {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem 1.2rem;
  margin: 1rem 0 1.3rem;
}
.who div { border-top: 1px solid var(--line); padding-top: 0.7rem; }
.who strong {
  display: block;
  font-size: 0.72rem;
  color: var(--dim);
  letter-spacing: 0.08em;
  margin-bottom: 0.15rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: 999px;
  padding: 0.62rem 1.15rem;
  font-weight: 600;
  font-size: 0.92rem;
  border: 0;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.05); }
.btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  filter: none;
}
.btn.ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}

.timeline { margin-top: 1.4rem; }
.tl {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1.2rem;
  padding: 1.05rem 0;
  border-top: 1px solid var(--line);
}
.tl .yr {
  font-family: "Inter Tight", sans-serif;
  color: var(--accent);
  font-weight: 600;
}
.tl h3 { font-size: 1.05rem; margin-bottom: 0.3rem; }
.tl p { margin: 0; color: var(--muted); font-size: 0.93rem; }

.footer {
  margin-top: 4rem;
  padding: 2rem 0 2.6rem;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 1.5rem;
}
.tagline {
  font-family: "Inter Tight", sans-serif;
  font-size: 1.7rem;
  line-height: 1.15;
  letter-spacing: -0.04em;
}
.tagline em { font-style: normal; color: var(--accent); }
.footer h4 { font-size: 0.92rem; margin-bottom: 0.4rem; }
.footer p { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.88rem; }

.crumb {
  color: var(--dim);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  margin-bottom: 0.7rem;
}
.crumb b { color: var(--text); font-weight: 500; }
.product-hero { padding: 1.8rem 0 1rem; }
.product-hero h1 {
  font-size: clamp(1.85rem, 5.4vw, 3.4rem);
  line-height: 0.95;
  margin-bottom: 0.7rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin: 1.2rem 0;
}
.metric {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 0.9rem 1rem;
}
.metric span { display: block; color: var(--muted); font-size: 0.78rem; }
.metric strong {
  display: block;
  font-family: "Inter Tight", sans-serif;
  font-size: 1.45rem;
  letter-spacing: -0.03em;
  margin-top: 0.15rem;
}
.metric small { color: var(--muted); }
.metric small.up, .metric strong.up { color: var(--accent); }
.metric small.down, .metric strong.down { color: #ff4d5a; }
.metrics.wide { grid-template-columns: repeat(5, 1fr); }

.demo,
.mosaic {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  gap: 1.2rem;
  margin: 1rem 0 2.2rem;
  align-items: stretch;
}
.mosaic > .panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.mosaic-media .video-slot,
.mosaic-media .preview-viewport {
  flex: 1 1 auto;
  min-height: 240px;
}
.limits-mosaic {
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  grid-template-areas:
    "media side"
    "media controls";
  column-gap: 1.2rem;
  row-gap: 0;
}
.limits-mosaic .mosaic-media { grid-area: media; }
.limits-mosaic .mosaic-side { grid-area: side; }
.limits-mosaic .video-controls { grid-area: controls; }
.limits-mosaic .mosaic-side {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}
.limits-mosaic .video-controls {
  margin-top: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
  border-top: 0;
  padding-top: 0.35rem;
}
.mosaic-side .metrics {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.4rem;
  margin: 0 0 0.65rem;
}
#clip-metrics {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.mosaic-side .metric {
  padding: 0.35rem 0.5rem;
  border-radius: 12px;
}
.mosaic-side .metric span { font-size: 0.68rem; }
.mosaic-side .metric strong {
  font-size: 0.95rem;
  margin-top: 0.02rem;
}
.mosaic-side .metric small { font-size: 0.72rem; }
.try-own {
  padding: 0.4rem 0 2.8rem;
  border-top: 1px solid var(--line);
  margin-top: 0.4rem;
}
.try-own h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0.35rem 0 0.6rem;
}
.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1rem 1.05rem 1.15rem;
}
.panel h3 { font-size: 1.05rem; margin-bottom: 0.7rem; }
.video-slot {
  min-height: 180px;
  border-radius: 12px;
  background: #0a0a0a;
  border: 1px dashed var(--line);
  display: grid;
  place-items: center;
  color: var(--muted);
  text-align: center;
  padding: 0.8rem;
}
.video-slot.is-drag,
.upload-bar.is-drag,
.preview-viewport.is-drag {
  border-color: var(--accent);
  color: var(--text);
}
.video-slot video,
.video-slot audio {
  width: 100%;
  border-radius: 12px;
}
.video-slot video {
  max-height: min(56vh, 480px);
  object-fit: contain;
  background: #000;
}
.pills { display: flex; flex-wrap: wrap; gap: 0.45rem; margin: 0.6rem 0 0.85rem; }
.pills button {
  appearance: none;
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.38rem 0.85rem;
  cursor: pointer;
}
.pills button.active {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: transparent;
}
.pills button.add {
  border-style: dashed;
  color: var(--text);
}
.note { color: var(--muted); font-size: 0.88rem; line-height: 1.5; }
.range { width: 100%; accent-color: var(--accent); margin: 0.4rem 0 0.8rem; }
.pair { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.8rem 0.75rem;
}
.form-grid > * { min-width: 0; }
label {
  display: grid;
  gap: 0.28rem;
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 0;
}
input[type="number"],
input[type="text"],
input[type="file"],
select {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  background: var(--bg-2);
  color: var(--text);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
}
.upload-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.85rem;
  margin: 0 0 0.85rem;
  padding: 0;
  background: none;
  border: 0;
}
.upload-bar .note,
.upload-bar .status {
  margin: 0;
}
.upload-bar .status.is-err { color: #ff8a90; }
.upload-bar input[type="file"] { display: none; }
#rpm-chart { height: 280px; }
.mosaic-side #rpm-chart {
  flex: 1 1 auto;
  min-height: 220px;
  height: auto;
}

.fold-toggle {
  appearance: none;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  background: none;
  border: 0;
  color: inherit;
  cursor: pointer;
  padding: 0;
  text-align: left;
}
.fold-toggle h3 { margin: 0; }
.fold-hint {
  color: var(--muted);
  font-size: 0.8rem;
  white-space: nowrap;
}
.fold-body { margin-top: 0.85rem; }

.tires-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.2rem;
  align-items: start;
  margin: 1rem 0 2.2rem;
}
.tires-form,
.tires-form .panel { min-width: 0; }
.tires-form .panel { margin-bottom: 0.8rem; }
.tires-form .form-grid:not(.tire-quad) {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.tires-actions {
  position: sticky;
  bottom: 0;
  z-index: 5;
  margin-top: 0.35rem;
  padding: 0.75rem 0 0.15rem;
  background: linear-gradient(transparent, var(--bg) 32%);
}
.tires-actions .btn { width: 100%; }
.tires-empty {
  min-height: 16rem;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
}
.tire-quad {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.form-grid .check {
  margin-top: 0.35rem;
  min-width: 0;
}
.check {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text);
  font-size: 0.9rem;
  margin-top: 0.75rem;
}
.fold-body > .check:first-child { margin-top: 0; }
.wheels {
  display: grid;
  grid-template-columns: 1fr 72px 1fr;
  grid-template-rows: auto auto;
  gap: 0.7rem;
  align-items: center;
  margin: 0.6rem 0 1rem;
}
.wheel {
  background: var(--card-2);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.85rem;
  text-align: center;
}
.wheel .pos {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--dim);
}
.wheel .val {
  font-family: "Inter Tight", sans-serif;
  font-size: 1.5rem;
  letter-spacing: -0.04em;
}
.wheel .delta { font-size: 0.78rem; color: var(--muted); }
.chassis {
  grid-column: 2;
  grid-row: 1 / span 2;
  height: 150px;
  border: 1px dashed var(--line);
  border-radius: 18px;
  display: grid;
  place-items: center;
  font-size: 0.65rem;
  letter-spacing: 0.16em;
  color: var(--dim);
}
.fl { grid-column: 1; grid-row: 1; }
.fr { grid-column: 3; grid-row: 1; }
.rl { grid-column: 1; grid-row: 2; }
.rr { grid-column: 3; grid-row: 2; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th, td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--line);
}
th { color: var(--muted); font-weight: 500; }

.soon {
  display: inline-block;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.6rem;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1rem;
}
.warn {
  background: #1a1710;
  border: 1px solid #3a3420;
  color: #e6d9a8;
  border-radius: 14px;
  padding: 0.9rem 1rem;
}
.hidden { display: none !important; }
.status { color: var(--muted); font-size: 0.88rem; min-height: 1.2em; }

.legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.2rem;
  color: var(--muted);
  font-size: 0.88rem;
  margin: 0.4rem 0 1rem;
}
.legend-dot {
  display: inline-block;
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 99px;
  margin-right: 0.35rem;
  vertical-align: middle;
}
.preview-viewport {
  background: #0a0a0a;
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.preview-viewport canvas,
.preview-viewport video {
  display: block;
  width: 100%;
  height: auto;
  max-height: min(56vh, 520px);
  object-fit: contain;
  margin: 0 auto;
  background: #000;
}
.video-controls { margin-top: 0.15rem; }
.video-controls .pair {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.4rem;
}
.video-controls .btn {
  min-width: 0;
  padding: 0.5rem 0.4rem;
  font-size: 0.8rem;
  white-space: nowrap;
}
.mosaic-side .legend-row { margin: 0.15rem 0 0.7rem; }
.mosaic-side .note { margin: 0 0 0.7rem; }

@media (max-width: 880px) {
  .nav-inner { flex-wrap: wrap; min-height: auto; padding: 0.65rem 0 0.2rem; }
  .nav-links {
    display: flex;
    width: 100%;
    justify-content: space-between;
    padding-bottom: 0.55rem;
    font-size: 0.85rem;
  }
  .grid-3, .eco, .cols-2, .footer, .who {
    grid-template-columns: 1fr;
  }
  .demo,
  .mosaic,
  .tires-split {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }
  .limits-mosaic {
    grid-template-columns: 1fr;
    grid-template-areas:
      "media"
      "controls"
      "side";
    row-gap: 0.85rem;
    column-gap: 0;
  }
  .limits-mosaic .mosaic-side,
  .limits-mosaic .video-controls {
    border-radius: 18px;
    border-top: 1px solid var(--line);
    padding-top: 1rem;
  }
  .mosaic-media .video-slot,
  .mosaic-media .preview-viewport {
    flex: 0 0 auto;
    min-height: 0;
    max-height: none;
  }
  .limits-mosaic .preview-viewport {
    display: block;
  }
  .tires-form { order: -1; }
  .metrics,
  .metrics.wide,
  .form-grid {
    grid-template-columns: 1fr 1fr;
  }
  .mosaic-side .metrics { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .video-slot,
  .preview-viewport {
    max-height: none;
  }
  .video-slot video {
    max-height: 42vh;
  }
  .limits-mosaic .preview-viewport video,
  .limits-mosaic .preview-viewport canvas {
    max-height: none;
    width: 100%;
    height: auto;
  }
  #rpm-chart { height: 220px; }
  .wheels { grid-template-columns: 1fr 1fr; }
  .chassis { display: none; }
  .fl, .fr, .rl, .rr { grid-column: auto; grid-row: auto; }
}

@media (min-width: 881px) {
  .tires-actions {
    position: static;
    background: none;
    padding-top: 0.2rem;
  }
}