/* Tokens: taken from the robot (see STYLE.md) */
:root {
  color-scheme: light;
  --bg: #f2f3f0;
  --surface: #fafbf8;
  --ink: #141714;
  --ink-2: #454b46;
  --ink-3: #646b65;
  --line: #d6d9d3;
  --accent: #1a7f33;
  --on-accent: #ffffff;
  --accent-soft: #e2efe3;
  --tan: #8a7a4f;
  --led: #d42f2a;
  --shadow: 0 1px 2px rgb(20 40 25 / .06), 0 8px 24px rgb(20 40 25 / .06);
  --s1: #2a78d6; --s2: #eb6834; --s3: #1baf7a; --s4: #eda100; --s5: #e87ba4;
  --r-sm: 6px;
  --r: 12px;
  --wrap: 1200px;
  --gut: 16px;
}
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0f1110;
    --surface: #171a18;
    --ink: #eef0ec;
    --ink-2: #b9c0b8;
    --ink-3: #8d948c;
    --line: #2b302c;
    --accent: #3fcf63;
    --on-accent: #0b130d;
    --accent-soft: #15291a;
    --tan: #c4b07e;
    --led: #ff4a43;
    --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 12px 32px rgb(0 0 0 / .25);
    --s1: #3987e5; --s2: #d95926; --s3: #199e70; --s4: #c98500; --s5: #d55181;
  }
}
@media (min-width: 768px) { :root { --gut: 32px; } }

/* Base */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 1rem/1.6 "Geist", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: var(--r-sm); }
h1, h2, h3 { font-weight: 600; letter-spacing: -0.03em; line-height: 1.1; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(2.1rem, 4.6vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3 { font-size: 1.15rem; letter-spacing: -0.015em; }
p { margin: 0; max-width: 65ch; color: var(--ink-2); }
.mono { font-family: "Geist Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gut); }
.section { padding: 72px 0; }
.section + .section { border-top: 1px solid var(--line); }
.intro { margin-top: 12px; }
.eyebrow { font: 500 .75rem/1 "Geist Mono", monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); margin-bottom: 16px; }
.muted { color: var(--ink-3); font-size: .875rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* Header */
.site-head { position: sticky; top: 0; z-index: 10; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.02em; color: var(--ink); text-decoration: none; white-space: nowrap; }
.brand::before { content: ""; width: 10px; height: 10px; border-radius: 50%; background: var(--led); box-shadow: 0 0 0 3px color-mix(in srgb, var(--led) 25%, transparent); }
.nav { display: flex; gap: 4px; overflow-x: auto; }
.nav a { color: var(--ink-2); text-decoration: none; padding: 8px 12px; border-radius: var(--r-sm); font-size: .95rem; white-space: nowrap; }
.nav a:hover { color: var(--ink); background: var(--accent-soft); }
.nav a[aria-current="page"] { color: var(--ink); font-weight: 500; box-shadow: inset 0 -2px 0 var(--accent); border-radius: 0; }
@media (max-width: 560px) { .brand span { display: none; } .nav a { padding: 8px 8px; font-size: .9rem; } }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 20px; border-radius: var(--r-sm); background: var(--accent); color: var(--on-accent); font-weight: 500; text-decoration: none; border: 1px solid var(--accent); white-space: nowrap; transition: transform .15s, background .15s; cursor: pointer; font: inherit; font-weight: 500; }
.btn:hover { background: color-mix(in srgb, var(--accent) 88%, var(--ink)); }
.btn:active { transform: translateY(1px) scale(.98); }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--accent); background: var(--accent-soft); }
.btn.sm { padding: 7px 12px; font-size: .875rem; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* Hero */
.hero { padding: 48px 0 64px; }
.hero .wrap { display: grid; gap: 40px; align-items: center; }
.hero h1 { max-width: 16ch; font-size: clamp(2.1rem, 4vw, 3.3rem); }
.hero p { margin-top: 20px; font-size: 1.125rem; }
.hero-img { border-radius: var(--r); background: linear-gradient(160deg, #dfe6ef, #b9c6d6); box-shadow: var(--shadow); }
@media (min-width: 900px) { .hero .wrap { grid-template-columns: 5fr 7fr; } .hero { padding: 72px 0 88px; } }
@media (prefers-reduced-motion: no-preference) {
  .hero .wrap > * { animation: rise .7s cubic-bezier(.16,1,.3,1) both; }
  .hero .wrap > *:nth-child(2) { animation-delay: .12s; }
  @keyframes rise { from { opacity: 0; transform: translateY(14px); } }
}

/* Carbon twill texture: one panel per page */
.carbon {
  background-color: var(--surface);
  background-image:
    repeating-linear-gradient(45deg, rgb(127 127 127 / .05) 0 4px, transparent 4px 8px),
    repeating-linear-gradient(-45deg, rgb(127 127 127 / .04) 0 4px, transparent 4px 8px);
}

/* Result band */
.result { display: grid; gap: 32px; align-items: center; }
.result .place { font: 600 clamp(5rem, 14vw, 9rem)/.85 "Geist", sans-serif; letter-spacing: -0.06em; color: var(--accent); }
.result .place sup { font-size: .35em; letter-spacing: 0; vertical-align: top; position: relative; top: .3em; }
.result h2 { margin-top: 12px; }
.result figure { margin: 0; }
@media (min-width: 900px) { .result { grid-template-columns: auto 1fr 300px; gap: 48px; } }

/* Figures */
figure { margin: 0; }
figure img { border-radius: var(--r); }
figcaption { margin-top: 10px; font-size: .875rem; color: var(--ink-3); }

/* Arena gallery: 5 photos, 5 cells */
.gallery { display: grid; gap: 12px; margin-top: 32px; }
.gallery img { width: 100%; height: 100%; object-fit: cover; aspect-ratio: 4/3; }
@media (min-width: 768px) {
  .gallery { grid-template-columns: 2fr 1fr 1fr; }
  .gallery figure:first-child { grid-row: span 2; display: flex; flex-direction: column; }
  .gallery figure:first-child img { aspect-ratio: auto; flex: 1; min-height: 0; }
}

/* Design evolution */
.evo { display: grid; gap: 20px; margin-top: 32px; align-items: end; }
.evo img { background: #c9d3e0; }
.evo .step { font: 500 .8rem "Geist Mono", monospace; color: var(--tan); }
.evo h3 { margin: 4px 0 6px; }
@media (min-width: 900px) { .evo { grid-template-columns: 1fr 1fr 2fr; } }

/* Spec tiles */
.specs { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; margin-top: 32px; }
.stat { background: var(--surface); padding: 24px; }
.stat b { display: block; font: 600 clamp(1.6rem, 3vw, 2.2rem)/1.1 "Geist Mono", monospace; letter-spacing: -0.04em; color: var(--ink); }
.stat span { display: block; margin-top: 8px; font-size: .9rem; color: var(--ink-3); }
@media (min-width: 900px) { .specs { grid-template-columns: repeat(4, 1fr); } }

/* CTA strip */
.cta { display: grid; gap: 24px; align-items: center; border-radius: var(--r); padding: 40px; border: 1px solid var(--line); }
@media (min-width: 900px) { .cta { grid-template-columns: 1fr auto; } }
@media (max-width: 560px) { .cta { padding: 24px; } }

/* Weight chart */
.chart { margin-top: 32px; padding: 28px; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); }
.totals { display: flex; flex-wrap: wrap; gap: 12px 40px; align-items: baseline; }
.totals .stat { padding: 0; background: none; }
.totals .stat.bad b { color: var(--led); }
.bar-area { position: relative; margin: 44px 0 12px; }
.bar { display: flex; gap: 2px; height: 44px; }
.seg { height: 100%; min-width: 0; transition: flex-basis .45s cubic-bezier(.16,1,.3,1); cursor: default; outline-offset: 3px; }
.seg:first-child { border-radius: 4px 0 0 4px; }
.seg:last-child { border-radius: 0 4px 4px 0; }
.seg:hover, .seg:focus-visible { filter: brightness(1.08); }
.limit { position: absolute; top: -30px; bottom: -8px; width: 0; border-left: 2px dashed var(--ink); }
.limit span { position: absolute; top: 0; left: 6px; font: 500 .75rem "Geist Mono", monospace; color: var(--ink); white-space: nowrap; }
.axis { position: absolute; left: 0; right: 0; top: 52px; font: .75rem "Geist Mono", monospace; color: var(--ink-3); }
.legend { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 20px; padding: 0; list-style: none; font-size: .9rem; color: var(--ink-2); }
.legend li { display: flex; align-items: center; gap: 8px; }
.legend i { width: 12px; height: 12px; border-radius: 3px; }
.legend .mono { color: var(--ink); }
.tip { position: absolute; z-index: 5; pointer-events: none; background: var(--ink); color: var(--bg); padding: 8px 12px; border-radius: var(--r-sm); font-size: .85rem; line-height: 1.4; white-space: nowrap; transform: translate(-50%, calc(-100% - 10px)); opacity: 0; transition: opacity .12s; }
.tip.on { opacity: 1; }
@media (prefers-reduced-motion: reduce) { .seg, .btn, .tip { transition: none; } }

/* Parts table: grouped, collapses to cards on mobile */
.tools { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.parts { width: 100%; border-collapse: collapse; margin-top: 24px; font-size: .925rem; }
.parts th { text-align: left; font-weight: 500; font-size: .8rem; color: var(--ink-3); padding: 8px 12px; }
.parts td { padding: 10px 12px; vertical-align: top; }
.parts .num { text-align: right; white-space: nowrap; }
.parts tbody tr.group td { padding-top: 28px; border-bottom: 1px solid var(--line); }
.parts tbody tr.group h3 { display: flex; align-items: center; gap: 10px; }
.parts tbody tr.group i { width: 12px; height: 12px; border-radius: 3px; }
.parts tbody tr.group .mono { margin-left: auto; font-size: .9rem; font-weight: 500; color: var(--ink-2); }
.parts tr.off td:not(:first-child) { opacity: .45; }
.parts tr.off .name { text-decoration: line-through; }
.parts .name { color: var(--ink); font-weight: 500; }
.parts .name a { color: inherit; }
.parts .name a:hover { color: var(--accent); }
.parts .id { font: .75rem "Geist Mono", monospace; color: var(--ink-3); }
.parts .dims { font: .82rem "Geist Mono", monospace; color: var(--ink-2); }
.tag { display: inline-block; font: 500 .7rem "Geist Mono", monospace; padding: 1px 6px; border-radius: 4px; border: 1px solid var(--line); color: var(--tan); margin-left: 6px; vertical-align: 1px; }
.parts input { width: 18px; height: 18px; accent-color: var(--accent); cursor: pointer; margin: 2px 0 0; }
.parts tfoot td { padding-top: 20px; border-top: 2px solid var(--ink); font-weight: 600; }
@media (max-width: 767px) {
  .parts thead { display: none; }
  .parts, .parts tbody, .parts tfoot, .parts tr, .parts td { display: block; }
  .parts tbody tr:not(.group) { display: grid; grid-template-columns: 28px 1fr auto; gap: 2px 10px; padding: 12px 0; border-bottom: 1px solid var(--line); }
  .parts tbody tr:not(.group) td { padding: 0; }
  .parts td.check { grid-row: span 3; }
  .parts td.part { grid-column: 2 / 4; }
  .parts td.dims { grid-column: 2 / 4; }
  .parts td.qty::before { content: "Qty "; color: var(--ink-3); }
  .parts td.qty { grid-column: 2; text-align: left; }
  .parts td.mass { grid-column: 3; }
  .parts td.cost { grid-column: 3; }
  .parts tfoot tr { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
  .parts tfoot td:empty { display: none; }
  .chart { padding: 20px; }
}

/* CAD block */
.cad { display: grid; gap: 32px; margin-top: 32px; }
.cad dl { display: grid; grid-template-columns: auto 1fr; gap: 8px 20px; margin: 20px 0 0; font-size: .925rem; }
.cad dt { color: var(--ink-3); }
.cad dd { margin: 0; color: var(--ink); }
.views { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.views figure:first-child { grid-column: span 2; }
@media (min-width: 900px) { .cad { grid-template-columns: 2fr 3fr; } }

/* Disclaimers: CAD callout and fine print */
.note { margin-top: 24px; padding: 14px 18px; border-left: 3px solid var(--tan); border-radius: var(--r-sm); background: var(--surface); color: var(--ink-2); font-size: .95rem; max-width: 65ch; }
.note b { color: var(--ink); font-weight: 600; }
.fine { margin-top: 12px; font-size: .78rem; color: var(--ink-3); }

/* Sponsors */
.split { display: grid; gap: 40px; align-items: start; }
@media (min-width: 900px) { .split { grid-template-columns: 1fr 1fr; gap: 64px; } }
.budget { margin-top: 24px; }
.budget div { display: flex; justify-content: space-between; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.budget div:last-child { border-bottom: 0; font-weight: 600; color: var(--ink); }
.budget span:first-child { color: var(--ink-2); }
.offer { padding: 0; margin: 20px 0 0; list-style: none; counter-reset: o; }
.offer li { padding: 14px 0 14px 44px; position: relative; color: var(--ink-2); border-top: 1px solid var(--line); }
.offer li::before { counter-increment: o; content: counter(o); position: absolute; left: 0; top: 12px; width: 28px; height: 28px; border-radius: var(--r-sm); display: grid; place-items: center; font: 500 .8rem "Geist Mono", monospace; background: var(--accent-soft); color: var(--accent); }
.offer b { color: var(--ink); font-weight: 500; }
.logos { margin-top: 32px; min-height: 180px; border: 1.5px dashed var(--line); border-radius: var(--r); display: grid; place-items: center; text-align: center; padding: 32px; }
.logos p { margin: 8px auto 20px; }

/* Sponsor list: card grid, equal logo panels on white; 1 col on phones, 2 on wider screens */
.sponsors { display: grid; gap: 20px; margin-top: 40px; }
@media (min-width: 768px) { .sponsors { grid-template-columns: 1fr 1fr; gap: 24px; } }
.sponsor { display: flex; flex-direction: column; overflow: hidden; border: 1px solid var(--line); border-radius: var(--r); background: var(--surface); box-shadow: var(--shadow); transition: border-color .15s, transform .15s; }
.sponsor:hover { border-color: color-mix(in srgb, var(--accent) 50%, var(--line)); transform: translateY(-2px); }
.sponsor-logo { display: flex; align-items: center; justify-content: center; height: 168px; padding: 28px 40px; background: #ffffff; border-bottom: 1px solid var(--line); }
.sponsor-logo img { width: 100%; max-width: 280px; height: 100%; object-fit: contain; }
.sponsor > div { display: flex; flex-direction: column; flex: 1; padding: 22px 24px 24px; }
.sponsor h2 { font-size: 1.3rem; letter-spacing: -0.02em; }
.sponsor p { margin-top: 8px; font-size: .95rem; }
.sponsor-link { margin-top: auto; padding-top: 16px; font-weight: 500; font-size: .95rem; }
.sponsor-link::after { content: " →"; }
@media (prefers-reduced-motion: reduce) { .sponsor { transition: none; } .sponsor:hover { transform: none; } }

/* Footer */
.site-foot { border-top: 1px solid var(--line); padding: 32px 0 48px; font-size: .875rem; color: var(--ink-3); }
.site-foot .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
.site-foot a { color: var(--ink-2); }

/* Planning-range bracket under the weight bar */
.range { position: absolute; top: 52px; height: 8px; border: 1.5px solid var(--ink-3); border-top: 0; border-radius: 0 0 3px 3px; }
.range span { position: absolute; top: 10px; left: 50%; transform: translateX(-50%); font: .72rem "Geist Mono", monospace; color: var(--ink-3); white-space: nowrap; }
.bar-area { margin-bottom: 36px; }
.axis span { position: absolute; transform: translateX(-50%); white-space: nowrap; }
.axis span:first-child { transform: none; }
.range { top: 76px; }
.range span { top: 12px; }
.bar-area { margin-bottom: 64px; }
.limit span { left: auto; right: 6px; }
@media (max-width: 560px) {
  .totals { display: grid; grid-template-columns: repeat(3, auto); gap: 8px 16px; }
  .totals .stat b { font-size: 1.15rem; }
  .totals .stat span { font-size: .78rem; }
}

/* Future improvements (index) */
.next { display: grid; gap: 32px; margin-top: 32px; }
.next h3 { margin-bottom: 4px; }
@media (min-width: 900px) { .next { grid-template-columns: 3fr 2fr; gap: 64px; } }

/* Close-up renders, part drawings, stress study (build) */
.closeup, .sketches, .study { display: grid; gap: 16px; margin-top: 28px; }
.closeup img { background: #e6ecf2; }
.sketches img, .study img { border: 1px solid var(--line); }
.study .step { font: 500 .8rem "Geist Mono", monospace; color: var(--tan); margin-right: 6px; }
.study + .specs { margin-top: 24px; }
@media (min-width: 768px) {
  .closeup { grid-template-columns: 2fr 1fr; }
  .closeup figure:first-child { grid-row: span 2; }
  .sketches { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 900px) { .study { grid-template-columns: repeat(3, 1fr); } }
.sketches a, .study a { display: block; border-radius: var(--r); }