:root {
  --ink: #121714;
  --muted: #5a6a60;
  --paper: #f3f7f4;
  --paper-2: #ffffff;
  --line: #d5e0d8;
  --ok: #0f8a52;
  --ok-soft: #e4f7ec;
  --stop: #c2410c;
  --stop-soft: #ffedd5;
  --font: "DM Sans", system-ui, sans-serif;
  --display: "Outfit", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 740px;
  --radius: 14px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(900px 480px at 85% -10%, rgba(15, 138, 82, 0.12), transparent 55%),
    radial-gradient(700px 420px at 0% 100%, rgba(194, 65, 12, 0.06), transparent 50%),
    var(--paper);
  min-height: 100vh;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--ok);
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.95rem 1.25rem;
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(243, 247, 244, 0.88);
  backdrop-filter: blur(10px);
}

.brand {
  font-family: var(--display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: -0.04em;
  text-decoration: none;
  color: var(--ink);
}

nav {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  font-size: 0.9rem;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-weight: 600;
}

nav a[aria-current="page"],
nav a:hover {
  color: var(--ink);
}

.shell {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto;
  padding-bottom: 3.5rem;
}

.hero {
  padding: 2.2rem 0 1.5rem;
  min-height: calc(100svh - 5rem);
  display: grid;
  align-content: start;
  gap: 0.35rem;
  animation: rise 0.45s ease both;
}

.hero-brand {
  margin: 0;
  font-family: var(--display);
  font-weight: 800;
  font-size: clamp(3.2rem, 10vw, 4.8rem);
  letter-spacing: -0.05em;
  line-height: 0.92;
}

.hero h1 {
  margin: 0.4rem 0 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.55rem, 4vw, 2.1rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
  max-width: 14ch;
}

.lede {
  margin: 0.55rem 0 1.1rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 38ch;
}

.demo-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.demo-row button {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink);
  font: inherit;
  font-size: 0.88rem;
  font-weight: 650;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.demo-row button:hover {
  border-color: var(--ok);
  background: var(--ok-soft);
  transform: translateY(-1px);
}

.start-board {
  background: var(--paper-2);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 1.15rem 1.15rem 1.25rem;
  box-shadow: 0 20px 50px rgba(18, 23, 20, 0.07);
  animation: rise 0.5s ease 0.06s both;
}

.board-label {
  margin: 0 0 0.45rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.board-label + .code-row,
.board-label + .vehicle-row {
  margin-bottom: 1rem;
}

.vehicle-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.45rem;
}

.vehicle-row button {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  padding: 0.9rem 0.4rem;
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease, border-color 0.12s ease;
}

.vehicle-row button:hover {
  border-color: #9fb5a7;
  transform: translateY(-1px);
}

.vehicle-row button[aria-pressed="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: #fff;
}

.code-row {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.5rem;
}

.code-input,
.direct-code input {
  width: 100%;
  font-family: var(--mono);
  font-size: 1.1rem;
  padding: 0.9rem 0.95rem;
  border: 1.5px solid var(--line);
  border-radius: 12px;
  background: #fff;
  color: var(--ink);
  text-transform: uppercase;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.code-input:focus,
.direct-code input:focus {
  outline: none;
  border-color: var(--ok);
  box-shadow: 0 0 0 3px rgba(15, 138, 82, 0.15);
}

.code-input.is-invalid {
  border-color: var(--stop);
  animation: shake 0.35s ease;
}

.btn-primary {
  appearance: none;
  border: 0;
  background: var(--ok);
  color: #fff;
  font: inherit;
  font-weight: 750;
  padding: 0.9rem 1.15rem;
  border-radius: 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: transform 0.12s ease, filter 0.12s ease;
}

.btn-primary:hover {
  filter: brightness(1.06);
  transform: translateY(-1px);
}

.text-link,
.linkish {
  appearance: none;
  border: 0;
  background: none;
  color: var(--ok);
  font: inherit;
  font-weight: 700;
  padding: 0.4rem 0 0;
  cursor: pointer;
  text-align: left;
}

.flow-nav {
  margin: 0 0 0.75rem;
}

.back-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  font: inherit;
  font-weight: 700;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
}

.back-btn:hover {
  border-color: var(--ink);
}

.panel {
  padding: 0.75rem 0 1rem;
  animation: rise 0.3s ease both;
}

.step-label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.4rem;
}

.panel h2 {
  margin: 0 0 0.55rem;
  font-family: var(--display);
  font-size: clamp(1.5rem, 3.2vw, 2rem);
  font-weight: 750;
  letter-spacing: -0.03em;
}

.hint {
  color: var(--muted);
  margin: 0 0 1rem;
}

.chassis-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.45rem;
}

.chassis-grid button,
.ask-row button,
.job-list button {
  appearance: none;
  width: 100%;
  border: 1px solid var(--line);
  background: var(--paper-2);
  color: var(--ink);
  font: inherit;
  text-align: left;
  padding: 0.95rem 1rem;
  border-radius: 12px;
  cursor: pointer;
  transition: border-color 0.12s ease, transform 0.12s ease, background 0.12s ease;
}

.chassis-grid button:hover,
.ask-row button:hover,
.job-list button:hover {
  border-color: #9fb5a7;
  transform: translateY(-1px);
}

.chassis-grid button .code,
.mono {
  font-family: var(--mono);
  font-weight: 600;
}

.chassis-grid button small {
  display: block;
  color: var(--muted);
  margin-top: 0.2rem;
  font-size: 0.82rem;
}

.chassis-grid button[aria-pressed="true"],
.ask-row button[aria-pressed="true"],
.job-list button[aria-pressed="true"] {
  border-color: var(--ok);
  background: var(--ok-soft);
}

.job-list,
.ask-row {
  display: grid;
  gap: 0.45rem;
}

.job-list button {
  font-weight: 750;
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
}

.job-list button span {
  color: var(--muted);
  font-weight: 600;
}

.direct-code {
  display: grid;
  gap: 0.35rem;
  margin-top: 1rem;
}

.direct-code label {
  color: var(--muted);
  font-size: 0.9rem;
}

.find-flow {
  display: grid;
  gap: 1rem;
}

.find-flow ol {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--muted);
}

.find-flow img {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.result {
  display: grid;
  gap: 1rem;
}

.result-hero {
  animation: rise 0.35s ease both;
}

.result-conclusion {
  margin: 0;
  padding: 1.15rem 1.2rem;
  background: linear-gradient(135deg, var(--ok-soft), #f7fffa);
  border: 1px solid #b7e0c7;
  border-radius: var(--radius);
  font-size: 1.18rem;
  font-weight: 750;
  letter-spacing: -0.02em;
}

.confidence {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 0.35rem;
  color: var(--ok);
}

.confidence.warn {
  color: var(--stop);
}

.decision-art {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  animation: rise 0.4s ease 0.05s both;
}

.decision-art img {
  display: block;
  width: 100%;
  height: auto;
}

.block-title {
  margin: 0 0 0.45rem;
  font-size: 0.75rem;
  font-family: var(--mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
}

.spec-table th,
.spec-table td {
  text-align: left;
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec-table tr:last-child th,
.spec-table tr:last-child td {
  border-bottom: 0;
}

.spec-table th {
  width: 36%;
  color: var(--muted);
  font-weight: 500;
  background: #f6faf7;
}

.spec-table td {
  font-family: var(--mono);
  font-size: 0.88rem;
}

.buy-list,
.hard-list,
.why-list,
.evidence-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.buy-list li {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
}

.buy-list a {
  font-weight: 750;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1.5px solid rgba(15, 138, 82, 0.45);
}

.buy-list small {
  display: block;
  margin-top: 0.25rem;
  color: var(--muted);
}

.hard-list li {
  border: 1px solid #fdba74;
  background: var(--stop-soft);
  border-radius: var(--radius);
  padding: 0.95rem 1rem;
  animation: pulse-stop 0.7s ease both;
}

.hard-list strong {
  display: block;
  margin-bottom: 0.25rem;
  color: var(--stop);
}

.hard-list p {
  margin: 0;
}

.why-list li,
.evidence-list li {
  position: relative;
  padding-left: 0.95rem;
  color: var(--muted);
}

.why-list li::before,
.evidence-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
}

.evidence-list .meta {
  font-family: var(--mono);
  font-size: 0.72rem;
}

.related {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.related button {
  appearance: none;
  border: 1px solid var(--ink);
  background: #fff;
  font: inherit;
  font-weight: 650;
  padding: 0.55rem 0.85rem;
  border-radius: 999px;
  cursor: pointer;
}

.crumb {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--muted);
  margin: 0 0 0.8rem;
}

.crumb button {
  appearance: none;
  border: 0;
  background: none;
  color: var(--ok);
  font: inherit;
  font-family: var(--mono);
  font-size: inherit;
  cursor: pointer;
  padding: 0;
}

.foot {
  width: min(100% - 2rem, var(--max));
  margin: 0 auto 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.86rem;
}

.foot nav {
  margin-bottom: 0.65rem;
}

.landing-note {
  margin: 1.25rem 0 0;
  padding: 0.9rem 1rem;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  color: var(--muted);
}

.silhouette-stage {
  display: none;
}

[hidden] {
  display: none !important;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes pulse-stop {
  0% {
    box-shadow: 0 0 0 0 rgba(194, 65, 12, 0.22);
  }
  100% {
    box-shadow: 0 0 0 10px rgba(194, 65, 12, 0);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  30% {
    transform: translateX(-4px);
  }
  60% {
    transform: translateX(4px);
  }
}

@media (max-width: 560px) {
  .vehicle-row,
  .code-row {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 1.5rem;
  }
}