:root {
  --carbon: #161a1d;
  --carbon-2: #1e2429;
  --bronze: #b08a4a;
  --rubber: #2d6a4f;
  --laser: #e23a2f;
  --warn: #e3b341;
  --ink: #ece7dc;
  --mute: #9a9080;
  --display: "Oswald", "Noto Sans SC", sans-serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 84px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--carbon);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-link {
  color: var(--bronze);
  text-decoration: underline;
  text-underline-offset: 3px;
}

button {
  font-family: inherit;
  cursor: pointer;
}

code {
  font-family: var(--mono);
  background: rgba(176, 138, 74, 0.16);
  padding: 0.05em 0.35em;
}

.carbon-grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1;
  opacity: 0.16;
  background-image: url("images/texture.webp");
  background-size: 240px auto;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 12px;
  top: 8px;
  z-index: 40;
  background: var(--bronze);
  color: var(--carbon);
  padding: 6px 10px;
}

.bronze-plate {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 10px 22px;
  background: rgba(22, 26, 29, 0.94);
  border-bottom: 3px solid var(--bronze);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: 0.08em;
  font-size: 22px;
  text-transform: uppercase;
}

.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 500;
  color: var(--mute);
  letter-spacing: 0.14em;
  text-transform: none;
}

.tread-ring {
  width: 30px;
  height: 30px;
  border: 5px solid var(--bronze);
  border-radius: 50%;
  position: relative;
}

.shear-lens {
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--rubber);
  box-shadow: 8px 0 0 -4px var(--laser);
}

.axle-nav {
  margin-left: auto;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 14px;
}

.axle-nav a.is-active {
  color: var(--bronze);
  box-shadow: inset 0 -2px 0 var(--bronze);
}

.axle-nav .live {
  background: var(--bronze);
  color: var(--carbon);
  padding: 4px 10px;
}

.nav-toggle {
  display: none;
  margin-left: auto;
  background: var(--bronze);
  color: var(--carbon);
  border: 0;
  width: 40px;
  height: 40px;
  font-family: var(--display);
}

.hero {
  display: grid;
  grid-template-columns: 1.08fr 1fr;
  min-height: 88vh;
  position: relative;
  z-index: 2;
}

.hero figure {
  margin: 0;
  border-right: 3px solid var(--bronze);
}

.hero img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  min-height: 88vh;
}

.hero-copy {
  padding: 48px 40px 40px;
  background:
    linear-gradient(180deg, rgba(176, 138, 74, 0.16), transparent 40%),
    var(--carbon);
}

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--bronze);
  margin: 0 0 12px;
}

h1,
h2,
h3 {
  font-family: var(--display);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.03em;
}

h1 {
  font-size: clamp(2rem, 4.2vw, 3.2rem);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.lead {
  margin: 0 0 18px;
  max-width: 44em;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 22px;
}

.chip {
  font-family: var(--mono);
  font-size: 12px;
  border: 1px solid var(--bronze);
  padding: 3px 8px;
  color: var(--bronze);
}

.chip.warn {
  border-color: var(--laser);
  color: var(--laser);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.btn {
  display: inline-block;
  padding: 10px 16px;
  font-size: 14px;
}

.btn-fill {
  background: var(--bronze);
  color: var(--carbon);
}

.btn-ghost {
  border: 1px solid var(--ink);
}

.bay {
  position: relative;
  z-index: 2;
  padding: 56px 40px 24px;
  max-width: 1180px;
  margin: 0 auto;
}

.bay-head {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 20px;
  margin-bottom: 28px;
}

.vlabel {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--bronze);
  margin: 0;
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  height: max-content;
}

.bay-head h2 {
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  margin: 0 0 8px;
}

.three-col,
.value-grid,
.role-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.value-grid {
  grid-template-columns: repeat(2, 1fr);
}

.three-col article,
.value-grid article,
.role-row article {
  background: var(--carbon-2);
  padding: 18px 18px 8px;
  border-top: 4px solid var(--rubber);
}

.three-col ul,
.rule-list {
  padding-left: 1.1em;
}

.grade-band {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 20px;
  background: var(--carbon-2);
  border: 1px solid rgba(176, 138, 74, 0.28);
  padding: 18px;
}

.grade-read label {
  display: block;
  font-size: 13px;
  color: var(--mute);
  margin: 12px 0 6px;
}

.grade-num {
  font-family: var(--display);
  font-size: 52px;
  margin: 4px 0;
  color: var(--bronze);
  letter-spacing: 0.08em;
}

#grade {
  width: 100%;
  accent-color: var(--bronze);
}

.tri-state {
  font-family: var(--mono);
  font-size: 13px;
  margin: 0;
}

.tri-state.ok {
  color: #6fbf8f;
}

.tri-state.warn {
  color: var(--warn);
}

.tri-state.late {
  color: var(--laser);
}

.cord-gold {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.cord-gold li {
  background: var(--carbon);
  border: 1px solid rgba(176, 138, 74, 0.28);
  padding: 12px 10px;
  font-size: 13px;
  min-height: 120px;
}

.cord-gold li span {
  display: block;
  font-family: var(--display);
  font-size: 28px;
  color: var(--bronze);
}

.cord-gold li small {
  display: block;
  margin-top: 8px;
  color: var(--mute);
}

.cord-gold li.is-now {
  outline: 2px solid var(--rubber);
}

.cord-gold li.is-late {
  outline: 2px solid var(--laser);
}

.cure-curve table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

.cure-curve th,
.cure-curve td {
  text-align: left;
  padding: 8px 10px;
  border-bottom: 1px solid rgba(236, 231, 220, 0.12);
  font-variant-numeric: tabular-nums;
  font-family: var(--mono);
}

.cure-curve th {
  font-size: 12px;
  color: var(--mute);
}

.cure-curve tr.duty td {
  color: var(--bronze);
  background: rgba(176, 138, 74, 0.1);
}

.pond-table {
  overflow-x: auto;
  margin-bottom: 22px;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.inset,
.pair figure {
  margin: 22px 0 0;
}

.inset img,
.pair img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  border: 1px solid rgba(176, 138, 74, 0.28);
}

figcaption {
  font-size: 13px;
  color: var(--mute);
  margin-top: 8px;
}

.rule-list li {
  margin-bottom: 8px;
}

.bronze-foot {
  position: relative;
  z-index: 2;
  margin-top: 40px;
  padding: 28px 40px 48px;
  background: #0e1113;
  color: var(--mute);
  border-top: 3px solid var(--bronze);
}

@media (max-width: 900px) {
  .hero,
  .bay-head,
  .three-col,
  .value-grid,
  .role-row,
  .grade-band,
  .pair,
  .cord-gold {
    grid-template-columns: 1fr;
  }

  .hero img {
    min-height: 42vh;
  }

  .nav-toggle {
    display: block;
  }

  .axle-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--carbon);
    padding: 12px 18px 18px;
    border-bottom: 3px solid var(--bronze);
    flex-direction: column;
  }

  .axle-nav.open {
    display: flex;
  }

  .vlabel {
    writing-mode: horizontal-tb;
    transform: none;
  }

  .bay,
  .hero-copy,
  .bronze-foot {
    padding-left: 18px;
    padding-right: 18px;
  }
}