:root {
  --bg: #F5F1E8;
  --bg-elevated: #FAF8F2;
  --bg-spec: #FBF9F3;
  --bg-dark: #2C2826;
  --bg-dark-elevated: #3A3431;
  --fg: #1A1A1A;
  --fg-soft: #2C2826;
  --fg-dim: #5C5C5C;
  --fg-on-dark: #F0EDE5;
  --fg-on-dark-dim: #A09890;
  --accent: #CC785C;
  --accent-hover: #B46449;
  --border: #E0DACE;
  --border-soft: #EBE5D8;
  --border-dark: #4A413E;
  --code-bg: #EBE5D5;

  --serif: "Source Serif 4", "Source Serif Pro", "Tiempos Headline", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: "IBM Plex Mono", "JetBrains Mono", "Menlo", "Monaco", "Consolas", monospace;

  --container: 1140px;
  --container-narrow: 740px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-pill: 999px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "ss01", "cv11";
}

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

a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--fg);
  transition: color 0.18s ease, border-color 0.18s ease;
}
a:hover { color: var(--accent); border-bottom-color: var(--accent); }

p { margin: 0 0 16px; }
ol, ul { margin: 0 0 16px; padding-left: 22px; }

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 28px;
}
.container.narrow { max-width: var(--container-narrow); }
.center { text-align: center; }

.mono { font-family: var(--mono); }
.serif { font-family: var(--serif); }

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--fg-dim);
  margin: 0 0 22px 0;
  font-weight: 500;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--fg);
}
h1.display {
  font-size: clamp(72px, 13vw, 168px);
  margin: 0 0 32px;
  letter-spacing: -0.05em;
  line-height: 0.92;
  font-weight: 600;
}
h2.display {
  font-size: clamp(34px, 5vw, 56px);
  margin: 0 0 28px;
  letter-spacing: -0.025em;
  font-weight: 500;
}
h3.subheading {
  font-size: 24px;
  margin: 40px 0 16px;
  letter-spacing: -0.015em;
}
.lead {
  font-size: 24px;
  line-height: 1.42;
  color: var(--fg);
  margin: 0 0 18px;
  font-weight: 400;
  font-family: var(--serif);
  letter-spacing: -0.008em;
}

/* nav */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(245, 241, 232, 0.86);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
}
.nav-brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  color: var(--fg);
  border-bottom: none;
  letter-spacing: -0.02em;
}
.nav-brand:hover { color: var(--fg); border-bottom: none; }
.site-nav nav { display: flex; gap: 28px; align-items: center; }
.site-nav nav a {
  color: var(--fg-dim);
  border-bottom: none;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: -0.005em;
}
.site-nav nav a:hover,
.site-nav nav a.active {
  color: var(--fg);
  border-bottom: none;
}

/* hero */
.hero { padding: 140px 0 100px; }
.hero .lead { max-width: 760px; font-weight: 400; }
.hero-meta {
  color: var(--fg-dim);
  max-width: 700px;
  font-size: 18px;
  line-height: 1.55;
}
.cta-row {
  display: flex;
  gap: 12px;
  margin: 36px 0 20px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-weight: 500;
  font-size: 15px;
  border: 1px solid var(--fg);
  border-radius: var(--radius-pill);
  color: var(--fg);
  background: transparent;
  cursor: pointer;
  font-family: var(--sans);
  letter-spacing: -0.005em;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
  text-decoration: none;
  line-height: 1.2;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.btn-secondary:hover {
  background: var(--fg);
  color: var(--bg);
}
.hero-dates {
  color: var(--fg-dim);
  font-size: 13px;
  margin-top: 20px;
  letter-spacing: 0.02em;
  font-weight: 500;
}

/* sections */
.section { padding: 100px 0; border-top: 1px solid var(--border-soft); }
.section-stages { background: var(--bg-elevated); }
.section-rewards {
  background: var(--bg-dark);
  color: var(--fg-on-dark);
  border-top-color: var(--bg-dark);
}
.section-rewards .kicker { color: var(--fg-on-dark-dim); }
.section-rewards h2,
.section-rewards h2.display { color: var(--fg-on-dark); }
.section-cta-final {
  padding: 120px 0;
  text-align: center;
  background: var(--bg);
}
.section-cta-final .cta-row { justify-content: center; }
.section-cta-final p {
  color: var(--fg-dim);
  font-size: 19px;
  font-family: var(--serif);
  font-weight: 400;
}

/* value list */
.value-list { padding-left: 0; list-style: none; margin: 32px 0 0; }
.value-list li {
  padding: 22px 0;
  border-top: 1px solid var(--border);
  color: var(--fg-dim);
  font-size: 16.5px;
}
.value-list li strong {
  display: block;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--fg);
  letter-spacing: -0.01em;
}

/* stages */
.stages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 36px;
  margin-top: 52px;
}
.stage {
  padding: 28px 0 0;
  border-top: 1px solid var(--fg);
  background: transparent;
  display: flex;
  flex-direction: column;
}
.stage-num {
  font-size: 11px;
  color: var(--fg-dim);
  margin: 0 0 8px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  font-weight: 500;
}
.stage-dates {
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 22px;
  letter-spacing: 0.04em;
  font-weight: 500;
}
.stage h3 {
  font-size: 26px;
  margin: 0 0 14px;
  letter-spacing: -0.018em;
  font-weight: 600;
}
.stage p {
  color: var(--fg-dim);
  font-size: 16px;
  line-height: 1.55;
}
.stage-advance {
  color: var(--fg-dim);
  font-size: 14.5px;
  margin: auto 0 0;
  padding-top: 16px;
}
.stage-advance strong { color: var(--fg); font-weight: 600; }

/* rewards */
.rewards-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 52px;
}
.reward-card {
  padding: 44px 40px;
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-lg);
  background: var(--bg-dark-elevated);
  display: flex;
  flex-direction: column;
}
.reward-card.highlighted {
  background: var(--accent);
  border-color: var(--accent);
}
.reward-title {
  font-family: var(--serif);
  font-size: 24px;
  margin: 0 0 32px;
  color: var(--fg-on-dark);
  font-weight: 600;
  letter-spacing: -0.015em;
}
.reward-card.highlighted .reward-title { color: #fff; }
.prize-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.prize-list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 18px 0;
  border-top: 1px solid var(--border-dark);
  font-family: var(--mono);
  font-size: 15px;
  color: var(--fg-on-dark);
}
.prize-list li:last-child { border-bottom: 1px solid var(--border-dark); }
.prize-place {
  color: var(--fg-on-dark-dim);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.prize-amount {
  color: var(--fg-on-dark);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 26px;
  letter-spacing: -0.02em;
}
.reward-headline {
  font-size: 17px;
  margin: 0 0 20px;
  color: var(--fg-on-dark);
  font-weight: 500;
  font-family: var(--mono);
  letter-spacing: 0.01em;
}
.reward-card.highlighted .reward-headline { color: rgba(255, 255, 255, 0.95); }
.reward-card p {
  color: var(--fg-on-dark-dim);
  font-size: 16px;
  line-height: 1.6;
}
.reward-card.highlighted p { color: rgba(255, 255, 255, 0.92); }
.reward-note {
  font-size: 14px !important;
  color: var(--fg-on-dark-dim);
  margin: auto 0 0 !important;
  padding-top: 18px;
}
.reward-card.highlighted .reward-note { color: rgba(255, 255, 255, 0.82) !important; }

/* logistics */
.logistics { margin: 32px 0 0; }
.logistics > div {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--border);
}
.logistics dt {
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  padding-top: 4px;
  font-weight: 500;
}
.logistics dd {
  margin: 0;
  font-size: 16.5px;
  line-height: 1.55;
}

/* faq */
.faq { margin: 32px 0 0; }
.faq > div {
  padding: 30px 0;
  border-top: 1px solid var(--border);
}
.faq dt {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  margin: 0 0 10px;
  color: var(--fg);
  letter-spacing: -0.012em;
}
.faq dd {
  margin: 0;
  color: var(--fg-dim);
  font-size: 16.5px;
  line-height: 1.6;
}

/* footer */
.site-footer {
  background: var(--bg-dark);
  color: var(--fg-on-dark-dim);
  padding: 48px 0;
  border-top: none;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}
.site-footer p {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.02em;
  font-weight: 500;
}
.footer-nav { display: flex; gap: 24px; }
.footer-nav a {
  color: var(--fg-on-dark-dim);
  font-size: 13px;
  border-bottom: none;
  font-weight: 500;
}
.footer-nav a:hover { color: var(--fg-on-dark); border-bottom: none; }

/* === spec page === */
.page-spec { background: var(--bg-spec); }
.page-spec .site-nav {
  background: rgba(251, 249, 243, 0.86);
  border-bottom-color: var(--border-soft);
}

.spec-hero {
  background: var(--bg-dark);
  color: var(--fg-on-dark);
  padding: 120px 0 80px;
}
.spec-hero .kicker { color: var(--fg-on-dark-dim); }
.spec-hero h1.display {
  color: var(--fg-on-dark);
  font-size: clamp(56px, 9vw, 108px);
  margin-bottom: 24px;
  letter-spacing: -0.04em;
}
.spec-hero .lead {
  color: var(--fg-on-dark-dim);
  max-width: 720px;
}
.spec-toc {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 4px 48px;
  margin-top: 56px;
  font-size: 14px;
  border-top: 1px solid var(--border-dark);
  padding-top: 28px;
}
.spec-toc a {
  color: var(--fg-on-dark-dim);
  border-bottom: none;
  padding: 9px 0;
  display: block;
  letter-spacing: 0.02em;
  font-weight: 500;
}
.spec-toc a:hover { color: var(--fg-on-dark); border-bottom: none; }

.spec-main { background: var(--bg-spec); }
.spec-body { padding: 72px 28px 140px; }
.spec-section {
  padding: 64px 0;
  border-top: 1px solid var(--border-soft);
  scroll-margin-top: 88px;
}
.spec-section:first-child {
  border-top: none;
  padding-top: 16px;
}
.section-num {
  color: var(--fg-dim);
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  font-weight: 500;
}
.spec-section h2 {
  font-size: clamp(32px, 4.5vw, 48px);
  margin: 0 0 32px;
  letter-spacing: -0.025em;
  font-weight: 600;
}
.spec-section h3 {
  font-size: 24px;
  margin: 40px 0 16px;
  letter-spacing: -0.015em;
  font-weight: 600;
}
.spec-section h3.endpoint {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--fg);
  font-weight: 600;
  background: var(--code-bg);
  padding: 10px 16px;
  display: inline-block;
  margin: 40px 0 16px;
  letter-spacing: 0.02em;
  border-radius: var(--radius-pill);
  border-bottom: none;
}
.spec-section h4 {
  font-family: var(--sans);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--fg-dim);
  margin: 32px 0 12px;
  font-weight: 600;
}

.spec-section ul, .spec-section ol { padding-left: 22px; margin: 0 0 16px; }
.spec-section li { margin: 8px 0; }
.spec-section .rules { padding-left: 22px; }
.spec-section .rules li { margin: 14px 0; }
.security-list li { margin: 24px 0; }
.security-list li strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  letter-spacing: -0.012em;
}
.resources-list { list-style: none; padding-left: 0; }
.resources-list li {
  padding: 18px 0;
  border-top: 1px solid var(--border);
}
.resources-list li:first-child {
  border-top: none;
  padding-top: 4px;
}

/* code */
code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  color: var(--fg);
  white-space: nowrap;
  font-weight: 500;
}
pre {
  background: var(--bg-dark);
  color: var(--fg-on-dark);
  padding: 24px 28px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.7;
  margin: 18px 0 30px;
  border-radius: var(--radius-md);
  position: relative;
  font-family: var(--mono);
}
pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  font-size: inherit;
  border-radius: 0;
  white-space: pre;
  font-family: inherit;
  font-weight: 400;
}
.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--mono);
  font-size: 11px;
  background: var(--bg-dark-elevated);
  color: var(--fg-on-dark-dim);
  border: 1px solid var(--border-dark);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  transition: opacity 0.18s ease, color 0.18s ease;
  font-weight: 500;
}
pre:hover .copy-btn { opacity: 1; }
.copy-btn:hover { color: var(--fg-on-dark); }
.copy-btn.copied { color: var(--accent); opacity: 1; }

/* tables */
.table-wrap {
  overflow-x: auto;
  margin: 18px 0 30px;
  border-top: 1px solid var(--border);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14.5px;
}
table th, table td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table tr:last-child td { border-bottom: none; }
table th {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  font-weight: 600;
  background: var(--bg);
}
table.judging td:last-child {
  font-family: var(--mono);
  width: 90px;
  text-align: right;
  font-weight: 600;
  color: var(--accent);
}

/* prose links inside spec body — use accent underline */
.spec-body a,
.faq dd a,
.logistics dd a {
  color: var(--fg);
  border-bottom: 1px solid var(--accent);
}
.spec-body a:hover,
.faq dd a:hover,
.logistics dd a:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* featured image (editorial hero feature) */
.featured {
  padding: 32px 0 8px;
}
.feature-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
}
.feature-figure img {
  width: 100%;
  height: auto;
  display: block;
}

/* inline figure (smaller, sits within narrow prose) */
.inline-figure {
  margin: 36px 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}
.inline-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.inline-figure figcaption {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--fg-dim);
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  letter-spacing: 0.01em;
  line-height: 1.5;
}

/* diagram figure (spec page, lighter chrome) */
.diagram-figure {
  margin: 24px 0 32px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg);
}
.diagram-figure img {
  width: 100%;
  height: auto;
  display: block;
}
.diagram-figure figcaption {
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--fg-dim);
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  letter-spacing: 0.01em;
  line-height: 1.5;
}

/* stage minimums callout */
.stage-minimums {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 36px 0 0;
}
.minimum {
  padding: 28px 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg);
}
.minimum-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--accent);
  margin: 0 0 16px;
  font-weight: 600;
}
.minimum ul {
  margin: 0;
  padding-left: 0;
  list-style: none;
}
.minimum ul li {
  margin: 0;
  padding: 14px 0;
  border-top: 1px solid var(--border);
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--fg-soft);
}
.minimum ul li:first-child {
  border-top: none;
  padding-top: 4px;
}
.minimum code {
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 1px 5px;
  white-space: normal;
}

/* judging axes triptych */
.judging-axes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin: 28px 0 32px;
}
.axis {
  padding: 26px 0 0;
  border-top: 1px solid var(--fg);
}
.axis-num {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--fg-dim);
  margin: 0 0 10px;
  font-weight: 500;
}
.axis h4 {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.015em;
  margin: 0 0 10px;
  color: var(--fg);
  text-transform: none;
}
.axis p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--fg-dim);
  margin: 0;
}

/* responsive */
@media (max-width: 900px) {
  .stages-grid { grid-template-columns: 1fr; gap: 28px; }
  .rewards-grid { grid-template-columns: 1fr; gap: 18px; }
  .stage-minimums { grid-template-columns: 1fr; gap: 16px; }
  .judging-axes { grid-template-columns: 1fr; gap: 28px; }
}

@media (max-width: 760px) {
  body { font-size: 16.5px; }
  .nav-inner { padding: 14px 20px; }
  .site-nav nav { gap: 18px; }
  .nav-brand { font-size: 20px; }
  .hero { padding: 90px 0 80px; }
  h1.display { font-size: 84px; }
  .spec-hero h1.display { font-size: 56px; }
  .section { padding: 72px 0; }
  .section-cta-final { padding: 90px 0; }
  .reward-card { padding: 36px 30px; }
  .prize-amount { font-size: 22px; }
  .logistics > div { grid-template-columns: 1fr; gap: 8px; padding: 20px 0; }
  .logistics dt { padding-top: 0; }
  .spec-toc { grid-template-columns: 1fr; }
  .spec-hero { padding: 90px 0 60px; }
  .spec-section { padding: 52px 0; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
  .copy-btn { opacity: 1; }
}

@media (max-width: 420px) {
  .cta-row { flex-direction: column; align-items: stretch; }
  .btn { text-align: center; }
}