/* Heatsink: the homelab site. Graphite and iron, copper heat, verdigris for "all good"; Big Shoulders over Instrument Sans. */
:root {
  color-scheme: dark;
  --graphite: #161412;
  --iron: #221E1A;
  --iron-2: #2C2622;
  --line: #3A332C;
  --line-2: #5A4F45;
  --copper: #D9783A;
  --copper-hot: #F0A06B;
  --verdigris: #4FB59B;
  --bone: #EFE7DC;
  --muted: #CFC6B8;
  --dim: #A89786;
  --trap: #FF7A59;
  --warn: #E8B23A;
  --display: 'Big Shoulders Display', 'Arial Narrow', sans-serif;
  --body: 'Instrument Sans', system-ui, sans-serif;
  --ease: cubic-bezier(.2, .8, .2, 1);
  --gutter: clamp(16px, 4vw, 64px);
}
*, *::before, *::after { box-sizing: border-box; }
html { background: var(--graphite); }
body { margin: 0; min-height: 100vh; display: flex; flex-direction: column; background: var(--graphite); color: var(--bone); font: 400 16px/1.6 var(--body); -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: var(--bone); }
a:hover { color: var(--copper-hot); }
button, input, select { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; z-index: 50; padding: 10px 14px; background: var(--copper); color: var(--graphite); }
.skip:focus { left: 8px; }
.muted { color: var(--dim); }
.eyebrow { font: 600 13px/1 var(--body); letter-spacing: .2em; text-transform: uppercase; color: var(--verdigris); }

/* Air moving through the fins, behind everything (app.js). */
.airflow { position: fixed; inset: 0; width: 100%; height: 100%; z-index: 0; pointer-events: none; opacity: .6; }

.top { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; gap: 24px; padding: 16px var(--gutter); background: color-mix(in srgb, var(--graphite) 82%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 12px; text-decoration: none; font: 900 30px/1 var(--display); letter-spacing: .06em; view-transition-name: brand; }
.brand-mark { width: 40px; height: 40px; }
.brand-mark .base, .brand-mark .core { fill: var(--copper); }
.brand-mark .fin { fill: var(--bone); transition: fill .4s; }
.brand:hover .fin { fill: var(--copper-hot); }
.top-nav { display: flex; flex-wrap: wrap; gap: 4px 22px; margin-left: auto; font-weight: 500; font-size: 15px; }
.top-nav a { text-decoration: none; padding: 8px 0; border-bottom: 2px solid transparent; transition: border-color .3s, color .3s; }
.top-nav a[aria-current="page"] { border-color: var(--copper); }

.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 12px 22px; border: 1px solid var(--line-2); background: transparent; color: var(--bone); font: 700 15px/1.2 var(--body); text-decoration: none; cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, calc(100% - 8px) 100%, 0 100%); transition: background .25s, color .25s, transform .25s var(--ease); }
.btn:hover { transform: translateY(-2px); color: var(--bone); background: var(--iron-2); }
.btn-copper { background: var(--copper); border-color: var(--copper); color: var(--graphite); }
.btn-copper:hover { background: var(--copper-hot); color: var(--graphite); }

.views { position: relative; z-index: 1; flex: 1; width: 100%; max-width: 1360px; margin: 0 auto; padding: 0 var(--gutter) 72px; outline: none; }
[hidden] { display: none !important; }
.view-head { padding-top: clamp(28px, 5vh, 56px); }
.view-head h2 { margin: 8px 0 8px; font: 900 clamp(48px, 7vw, 104px)/.86 var(--display); text-transform: uppercase; }
.lede { margin: 0; max-width: 62ch; color: var(--muted); font-size: clamp(17px, 1.6vw, 20px); }
.lede.small { font-size: 16px; }

/* Home: the headline heats up, copper rising through it like heat through a fin. */
.hero { display: grid; grid-template-columns: minmax(0, 6fr) minmax(0, 6fr); align-items: center; gap: 24px; padding-top: clamp(40px, 8vh, 110px); position: relative; z-index: 2; }
.hero-copy { display: flex; flex-direction: column; gap: 22px; min-width: 0; }
.hero-art { margin: 0; opacity: 0; animation: rise 1s var(--ease) .5s forwards; }
.hero-art svg { display: block; width: 100%; height: auto; overflow: visible; }
.hero-art .layer { transition: transform 1.1s var(--ease); }
.hero-art.is-exploded .layer[data-lift="1"] { transform: translateY(-46px); }
.hero-art.is-exploded .layer[data-lift="2"] { transform: translateY(-104px); }
.hero-art.is-exploded .layer[data-lift="3"] { transform: translateY(-200px); }
.hero-art .shell .f-l, .hero-art .lid .f-l { fill: #2A2420; } .hero-art .shell .f-r, .hero-art .lid .f-r { fill: #221E1A; } .hero-art .shell .f-t { fill: #1C1916; }
.hero-art polygon, .family svg polygon, .machine svg polygon { stroke: var(--line-2); stroke-width: 1; stroke-linejoin: round; }
.hero-art .lid .f-t { fill: color-mix(in srgb, var(--bone) 8%, transparent); stroke: var(--bone); }
.hero-art .lid .f-l, .hero-art .lid .f-r { stroke: var(--bone); }
.hero-art .board polygon { fill: #1F2A26; stroke: color-mix(in srgb, var(--verdigris) 50%, transparent); }
.hero-art .trace { stroke: color-mix(in srgb, var(--copper) 60%, transparent); stroke-width: 1.2; }
.hero-art .ram polygon { fill: #2E3A44; stroke: #6F8FA8; }
.hero-art .nvme polygon { fill: #23201C; stroke: var(--bone); }
.hero-art .riser polygon { fill: #2B2622; stroke: var(--dim); } .hero-art .card polygon { fill: color-mix(in srgb, var(--verdigris) 30%, #1C1916); stroke: var(--verdigris); }
.hero-art .cooler .f-t { fill: color-mix(in srgb, var(--copper) 55%, #1C1916); } .hero-art .cooler .f-l { fill: color-mix(in srgb, var(--copper) 35%, #1C1916); } .hero-art .cooler .f-r { fill: color-mix(in srgb, var(--copper) 25%, #1C1916); }
.hero-art .cooler polygon { stroke: var(--copper-hot); }
.hero-art .fin { stroke: var(--copper-hot); stroke-width: 1.4; }
.hero-art .air { fill: none; stroke: var(--verdigris); stroke-width: 1.6; stroke-dasharray: 6 10; opacity: .7; animation: airflow 1.6s linear infinite; }
.hero-art .air-1 { animation-delay: -.5s; } .hero-art .air-2 { animation-delay: -1s; stroke: var(--copper-hot); }
@keyframes airflow { to { stroke-dashoffset: -32; } }
.hero-art .callout { opacity: 0; transition: opacity .5s; }
.hero-art.is-exploded .callout { opacity: 1; transition-delay: .7s; }
.hero-art .callout line { stroke: var(--dim); stroke-width: 1; }
.hero-art .callout circle { fill: var(--copper); }
.hero-art .callout text { fill: var(--bone); font: 600 14px var(--body); }
.family svg, .machine svg { width: 72px; height: 60px; margin-bottom: 4px; }
.family svg .f-t, .machine svg .f-t { fill: #2C2622; } .family svg .f-l, .machine svg .f-l { fill: #221E1A; } .family svg .f-r, .machine svg .f-r { fill: #1C1916; }
.family svg .board polygon, .machine svg .board polygon { fill: #1F2A26; stroke: var(--verdigris); }
.family svg .cooler polygon, .machine svg .cooler polygon { fill: color-mix(in srgb, var(--copper) 45%, #1C1916); stroke: var(--copper-hot); }
.family svg .vent, .machine svg .vent, .family svg .trace, .machine svg .trace { stroke: var(--line-2); stroke-width: 1; }
.family:hover svg polygon, .machine[aria-pressed="true"] svg polygon { stroke: var(--copper-hot); }
.route-ico { width: 30px; height: 30px; margin-bottom: 4px; fill: none; stroke: var(--copper-hot); stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; transition: transform .3s var(--ease); }
.route-card:hover .route-ico { transform: translateY(-2px) rotate(-4deg); }
.route-card.fit-ok .route-ico { stroke: var(--verdigris); } .route-card.fit-trap .route-ico { stroke: var(--dim); }
.hero h1 { margin: 0; font: 900 clamp(72px, 11vw, 190px)/.82 var(--display); text-transform: uppercase; }
.heat-in .line { display: inline-block; background: linear-gradient(0deg, var(--copper) 0 50%, var(--bone) 50% 100%); background-size: 100% 200%; background-position: 0 0; -webkit-background-clip: text; background-clip: text; color: transparent; animation: heat 1.6s var(--ease) .2s forwards; }
.heat-in .line.accent { background-image: linear-gradient(0deg, var(--copper) 0 50%, var(--line-2) 50% 100%); animation-delay: .6s; }
.heat-in .line:not(.accent) { animation-name: heat-cool; }
@keyframes heat { to { background-position: 0 100%; } }
@keyframes heat-cool { 0% { background-position: 0 0; } 60% { background-position: 0 100%; } 100% { background-position: 0 0; } }
.hero .lede { opacity: 0; animation: rise .8s var(--ease) 1s forwards; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; opacity: 0; animation: rise .8s var(--ease) 1.2s forwards; }
.families { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; max-width: 640px; margin-top: 8px; opacity: 0; animation: rise .8s var(--ease) 1.4s forwards; }
.family { display: flex; flex-direction: column; gap: 2px; padding: 16px 18px; border: 1px solid var(--line); background: var(--iron); text-decoration: none; transition: border-color .3s, transform .3s var(--ease); }
.family:hover { border-color: var(--copper); transform: translateY(-3px); }
.family b { font: 800 24px/1 var(--display); text-transform: uppercase; letter-spacing: .02em; }
.family small { color: var(--dim); font-size: 13px; }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* A row of fins that glow copper under the pointer. */
.sink { display: flex; align-items: end; gap: 10px; height: 120px; margin: 46px 0 8px; }
.sink i { flex: 1; height: var(--h, 70%); background: linear-gradient(0deg, var(--iron-2), var(--line)); transition: background .5s, height .5s var(--ease); }
.sink i.hot { background: linear-gradient(0deg, var(--copper), var(--copper-hot) 70%, var(--bone)); height: calc(var(--h, 70%) + 8%); }
.sink::after { content: none; }

.section-title { margin: 30px 0 14px; font: 900 clamp(32px, 4vw, 52px)/1 var(--display); text-transform: uppercase; }
.tracks { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 12px; }
.track { display: flex; flex-direction: column; gap: 8px; padding: 22px; background: var(--iron); border-top: 4px solid var(--line-2); opacity: 0; animation: rise .6s var(--ease) forwards; animation-delay: calc(var(--i, 0) * 90ms + .2s); }
.track:first-child { border-top-color: var(--copper); }
.track:last-child { border-top-color: var(--verdigris); }
.track span { font: 800 48px/1 var(--display); color: var(--dim); }
.track:first-child span { color: var(--copper); }
.track:last-child span { color: var(--verdigris); }
.track b { font-size: 19px; }
.track small { color: var(--muted); font-size: 14px; line-height: 1.5; }
.track em { margin-top: auto; font-style: normal; font-size: 12px; letter-spacing: .14em; text-transform: uppercase; color: var(--dim); }
.tracks-big { margin-top: 26px; grid-template-columns: minmax(0, 1fr); }
.tracks-big .track { display: grid; grid-template-columns: 80px 1fr auto; align-items: center; gap: 4px 20px; }
.tracks-big .track span { grid-row: span 2; }

/* Will it fit? */
.fit-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 28px; margin-top: 28px; align-items: start; }
.fit-form { display: flex; flex-direction: column; gap: 18px; }
fieldset { margin: 0; padding: 0; border: 0; display: flex; flex-direction: column; gap: 10px; }
legend { padding: 0; margin-bottom: 10px; font: 800 20px/1 var(--display); letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
.chips, .seg { display: flex; flex-wrap: wrap; gap: 6px; }
.chip, .seg button { min-height: 42px; padding: 8px 14px; border: 1px solid var(--line-2); background: transparent; cursor: pointer; font-weight: 600; font-size: 14px; transition: background .25s, color .25s, border-color .25s; }
.chip[aria-pressed="true"], .seg button[aria-pressed="true"] { background: var(--bone); color: var(--graphite); border-color: var(--bone); }
.seg-sub button { min-height: 36px; font-size: 13px; }
.machines { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 8px; }
.machine { display: flex; flex-direction: column; gap: 2px; padding: 12px 14px; border: 1px solid var(--line); background: var(--iron); text-align: left; cursor: pointer; transition: border-color .25s, transform .25s var(--ease); }
.machine:hover { border-color: var(--line-2); transform: translateY(-2px); }
.machine[aria-pressed="true"] { border-color: var(--copper); box-shadow: inset 4px 0 0 var(--copper); }
.machine b { font: 800 22px/1.05 var(--display); text-transform: uppercase; }
.machine small { color: var(--dim); font-size: 12.5px; }

.readout { position: sticky; top: 92px; display: flex; flex-direction: column; gap: 10px; padding: 22px; background: var(--iron); border: 1px solid var(--line); view-transition-name: readout; }
.verdict { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 8px 16px; }
.verdict h3 { margin: 0; font: 900 clamp(34px, 3.4vw, 48px)/.95 var(--display); text-transform: uppercase; }
.verdict .tally { display: flex; gap: 14px; font-weight: 700; font-size: 14px; }
.tally .t { color: var(--trap); } .tally .w { color: var(--warn); } .tally .o { color: var(--verdigris); }
.meter { display: flex; height: 10px; gap: 3px; }
.meter i { flex: var(--n, 1); background: var(--line); transform-origin: left; animation: grow .7s var(--ease) both; }
.meter .t { background: var(--trap); } .meter .w { background: var(--warn); } .meter .o { background: var(--verdigris); }
@keyframes grow { from { transform: scaleX(0); } }
.rows { display: flex; flex-direction: column; gap: 8px; margin: 6px 0 0; padding: 0; list-style: none; }
.row { display: grid; grid-template-columns: 74px 1fr; gap: 4px 14px; padding: 14px 16px; background: var(--iron-2); border-left: 4px solid var(--line-2); animation: cool-in .5s var(--ease) both; animation-delay: calc(var(--i, 0) * 60ms); }
.row.trap { border-left-color: var(--trap); } .row.warn { border-left-color: var(--warn); } .row.ok { border-left-color: var(--verdigris); }
@keyframes cool-in { from { opacity: 0; transform: translateX(-10px); border-left-color: var(--copper-hot); } }
.sev { grid-row: span 3; align-self: start; padding: 4px 0; text-align: center; font: 800 15px/1 var(--display); letter-spacing: .1em; text-transform: uppercase; color: var(--graphite); }
.trap .sev { background: var(--trap); } .warn .sev { background: var(--warn); } .ok .sev { background: var(--verdigris); }
.row b { font-size: 16px; line-height: 1.3; }
.row p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }
.row .fix { color: var(--bone); }
.row .fix::before { content: 'Fix: '; color: var(--copper-hot); font-weight: 700; }
.conf { grid-column: 2; justify-self: start; font-size: 11.5px; letter-spacing: .12em; text-transform: uppercase; color: var(--dim); }
.conf.maker { color: var(--verdigris); }
.buy { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin-top: 8px; padding-top: 14px; border-top: 1px solid var(--line); }
.buy b { font: 800 18px/1 var(--display); letter-spacing: .08em; text-transform: uppercase; margin-right: 6px; }
.part-chip { padding: 7px 12px; border: 1px solid var(--copper); color: var(--copper-hot); background: transparent; font-weight: 600; font-size: 13px; text-decoration: none; cursor: pointer; }
.part-chip:hover { background: var(--copper); color: var(--graphite); }
.readout-foot { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 8px; }
.specs { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 6px; }
.specs div { padding: 10px; background: var(--graphite); }
.specs dt { color: var(--dim); font-size: 11px; letter-spacing: .12em; text-transform: uppercase; }
.specs dd { margin: 4px 0 0; font-weight: 600; font-size: 14px; }

/* Parts */
.search { display: block; max-width: 640px; margin-top: 24px; }
.search input { width: 100%; min-height: 56px; padding: 14px 18px; border: 1px solid var(--line-2); background: var(--iron); font-size: 18px; }
.search input:focus { border-color: var(--copper); outline: none; }
.part-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; margin-top: 20px; }
.part { display: flex; flex-direction: column; gap: 8px; padding: 20px; background: var(--iron); border: 1px solid var(--line); opacity: 0; animation: rise .45s var(--ease) forwards; animation-delay: calc(var(--i, 0) * 50ms); }
.part.hit { border-color: var(--copper); box-shadow: 0 0 0 1px var(--copper) inset, 0 20px 60px -30px color-mix(in srgb, var(--copper) 80%, transparent); }
.part .kind { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--verdigris); }
.part h3 { margin: 0; font: 900 30px/1 var(--display); text-transform: uppercase; }
.part code { font-size: 13px; color: var(--copper-hot); }
.part p { margin: 0; color: var(--muted); font-size: 14.5px; }
.part .fits { font-size: 13px; color: var(--dim); }
.empty { padding: 24px; border: 1px dashed var(--line-2); color: var(--muted); }


/* Routes */
.route-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 10px; margin-top: 18px; }
.route-card, .symptom { display: flex; flex-direction: column; gap: 6px; padding: 18px; border: 1px solid var(--line); border-top: 3px solid var(--line-2); background: var(--iron); text-align: left; cursor: pointer;
  animation: rise .5s var(--ease) both; animation-delay: calc(var(--i, 0) * 40ms); transition: border-color .25s, transform .25s var(--ease), background .25s; }
.route-card:hover, .symptom:hover { transform: translateY(-3px); border-top-color: var(--copper); }
.route-card.is-open, .symptom.is-open { border-color: var(--copper); background: color-mix(in srgb, var(--copper) 10%, var(--iron)); }
.route-card b, .symptom b { font: 800 22px/1.05 var(--display); text-transform: uppercase; letter-spacing: .02em; }
.route-card small, .symptom small { color: var(--muted); font-size: 13.5px; line-height: 1.45; }
.route-card .fit { margin-top: auto; padding-top: 8px; font-size: 13px; color: var(--muted); }
.route-card.fit-ok { border-top-color: var(--verdigris); } .route-card.fit-warn { border-top-color: var(--warn); } .route-card.fit-trap { border-top-color: var(--trap); opacity: .78; }
.badge { display: inline-block; padding: 2px 8px; font: 800 13px/1.3 var(--display); letter-spacing: .08em; text-transform: uppercase; font-style: normal; color: var(--graphite); }
.badge.ok { background: var(--verdigris); } .badge.warn { background: var(--warn); } .badge.trap { background: var(--trap); }
.fix-cta { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 6px 22px; margin-top: 18px; padding: 22px 24px; background: var(--iron); border: 1px solid var(--line); border-left: 4px solid var(--trap); text-decoration: none; transition: border-color .25s, transform .25s var(--ease); }
.fix-cta:hover { transform: translateY(-2px); border-color: var(--trap); color: var(--bone); }
.fix-cta b { font: 900 32px/1 var(--display); text-transform: uppercase; }
.fix-cta span { color: var(--muted); }
.fix-cta i { font-style: normal; font-size: 28px; color: var(--trap); }
.have { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; margin-top: 24px; }
.have > span { font: 800 18px/1 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.route-detail, .fix-detail { scroll-margin-top: 90px; }
.route-open, .fix-open { margin-top: 22px; padding: 26px; background: var(--iron); border: 1px solid var(--copper); animation: rise .45s var(--ease) both; }
.route-open h3, .fix-open h3 { margin: 6px 0 4px; font: 900 clamp(36px, 4.4vw, 60px)/.95 var(--display); text-transform: uppercase; }
.route-open header p { margin: 4px 0 0; color: var(--muted); max-width: 70ch; }
.route-open .needs b { color: var(--copper-hot); }
.route-open h4 { margin: 24px 0 10px; font: 800 22px/1 var(--display); letter-spacing: .06em; text-transform: uppercase; }
.tiers { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; margin-top: 20px; }
.tier { display: flex; flex-direction: column; gap: 6px; padding: 18px; background: var(--iron-2); border-top: 4px solid var(--line-2); animation: rise .5s var(--ease) both; animation-delay: calc(var(--i, 0) * 90ms); }
.tier-1 { border-top-color: var(--copper); } .tier-2 { border-top-color: var(--verdigris); }
.tier-name { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; color: var(--dim); }
.tier b { font: 800 26px/1 var(--display); text-transform: uppercase; }
.tier small { color: var(--muted); font-size: 13.5px; }
.tier-link { margin-top: auto; padding-top: 8px; color: var(--copper-hot); font-weight: 700; font-size: 14px; text-decoration: none; }
.route-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 24px; }
.plain { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; }
.plain li { padding: 8px 12px; background: var(--iron-2); font-size: 14.5px; }
.steps-list { margin: 0; padding: 0; list-style: none; counter-reset: s; display: grid; gap: 8px; }
.steps-list li { counter-increment: s; position: relative; padding: 10px 12px 10px 52px; background: var(--iron-2); font-size: 14.5px; }
.steps-list li::before { content: counter(s, decimal-leading-zero); position: absolute; left: 12px; top: 8px; font: 800 22px/1 var(--display); color: var(--copper); }

/* Fix it */
.symptoms { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 10px; margin-top: 18px; }
.symptom { border-top-color: color-mix(in srgb, var(--trap) 60%, var(--line-2)); }
.fix-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 14px; }
.thermo { display: grid; gap: 6px; min-width: 220px; }
.thermo span { position: relative; height: 12px; background: linear-gradient(90deg, var(--verdigris), var(--warn) 55%, var(--trap)); }
.thermo span::after { content: ''; position: absolute; inset: 0 0 0 auto; width: calc(var(--c, 0) * 100%); background: var(--iron-2); transition: width .8s var(--ease); }
.thermo b { font: 800 18px/1 var(--display); letter-spacing: .08em; text-transform: uppercase; text-align: right; color: var(--muted); }
.checklist { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; counter-reset: c; }
.checklist li { counter-increment: c; background: var(--iron-2); border-left: 4px solid var(--copper); animation: cool-in .45s var(--ease) both; animation-delay: calc(var(--i, 0) * 60ms); transition: border-color .4s, opacity .4s; }
.checklist li.done { border-left-color: var(--verdigris); opacity: .62; }
.checklist label { display: grid; grid-template-columns: 26px 1fr; gap: 12px; padding: 14px 16px; cursor: pointer; }
.checklist input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--verdigris); cursor: pointer; }
.checklist b { display: block; font-size: 15.5px; line-height: 1.35; }
.checklist b::before { content: counter(c) '. '; color: var(--copper-hot); }
.checklist li.done b { text-decoration: line-through; text-decoration-color: var(--verdigris); }
.checklist small { display: block; margin-top: 4px; color: var(--muted); font-size: 14px; }
.still { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 12px 20px; margin-top: 18px; padding: 18px 20px; border: 1px dashed var(--line-2); animation: rise .4s var(--ease) both; }
.still b { font: 900 26px/1 var(--display); text-transform: uppercase; }
.still p { margin: 0; flex: 1 1 320px; color: var(--muted); }

/* Where to buy */
.country select { appearance: none; min-height: 40px; padding: 8px 30px 8px 12px; border: 1px solid var(--line-2); background: var(--iron) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6 9l6 6 6-6' fill='none' stroke='%23CFC6B8' stroke-width='2'/%3E%3C/svg%3E") no-repeat right 8px center / 14px; color: var(--bone); font-weight: 600; font-size: 14px; cursor: pointer; }
.where { margin-top: 8px; padding-top: 14px; border-top: 1px solid var(--line); }
.where summary, .tier-buy summary { cursor: pointer; font: 800 18px/1.2 var(--display); letter-spacing: .08em; text-transform: uppercase; }
.where summary small { margin-left: 8px; font: 400 12px var(--body); letter-spacing: 0; text-transform: none; color: var(--dim); }
.buy-row { display: grid; grid-template-columns: minmax(120px, 200px) 1fr; align-items: center; gap: 6px 14px; padding: 10px 0; border-bottom: 1px solid var(--iron-2); }
.buy-row:last-child { border-bottom: 0; }
.buy-row b { font-size: 14px; }
.shops { display: flex; flex-wrap: wrap; gap: 6px; }
.shop { padding: 6px 10px; border: 1px solid var(--line-2); font-size: 13px; font-weight: 600; text-decoration: none; transition: border-color .2s, background .2s, color .2s; }
.shop:hover { border-color: var(--verdigris); color: var(--verdigris); }
.part .buy-row, .tier .buy-row { grid-template-columns: 1fr; padding: 6px 0 0; border: 0; }
.tier-buy summary { font-size: 14px; color: var(--muted); }
.tier-buy[open] summary { color: var(--bone); }

/* Plan my build: goals on the left, the one build that does them on the right, live. */
.plan-grid { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 28px; margin-top: 28px; align-items: start; }
.plan-form { display: flex; flex-direction: column; gap: 22px; }
.plan-form legend { display: flex; align-items: center; gap: 10px; color: var(--bone); }
.plan-form legend i { display: inline-grid; place-items: center; width: 28px; height: 28px; background: var(--copper); color: var(--graphite); font-style: normal; font-size: 17px; }
.goal-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 8px; }
.goal { position: relative; display: grid; grid-template-columns: 30px 1fr; align-items: start; gap: 12px; padding: 14px 40px 14px 14px; border: 1px solid var(--line); background: var(--iron); text-align: left; cursor: pointer;
  animation: rise .45s var(--ease) both; animation-delay: calc(var(--i, 0) * 30ms); transition: border-color .25s, background .25s, transform .25s var(--ease); }
.goal:hover { transform: translateY(-2px); border-color: var(--line-2); }
.goal .route-ico { width: 28px; height: 28px; margin: 0; stroke: var(--dim); }
.goal b { display: block; font: 800 19px/1.05 var(--display); text-transform: uppercase; letter-spacing: .02em; }
.goal small { display: block; margin-top: 4px; color: var(--dim); font-size: 12.5px; line-height: 1.35; }
.goal .tick { position: absolute; top: 12px; right: 12px; width: 20px; height: 20px; border: 1px solid var(--line-2); transition: background .25s, border-color .25s; }
.goal[aria-pressed="true"] { border-color: var(--copper); background: color-mix(in srgb, var(--copper) 12%, var(--iron)); }
.goal[aria-pressed="true"] .route-ico { stroke: var(--copper-hot); }
.goal[aria-pressed="true"] .tick { background: var(--copper); border-color: var(--copper); }
.goal[aria-pressed="true"] .tick::after { content: ''; position: absolute; left: 6px; top: 2px; width: 5px; height: 10px; border: solid var(--graphite); border-width: 0 2px 2px 0; transform: rotate(45deg); }
[data-plan-qs] { display: flex; flex-direction: column; gap: 22px; }
[data-plan-qs]:empty { display: none; }
.plan-q { animation: rise .4s var(--ease) both; animation-delay: calc(var(--i, 0) * 60ms); }

.plan-out { position: sticky; top: 92px; display: flex; flex-direction: column; gap: 12px; padding: 22px; background: var(--iron); border: 1px solid var(--line); view-transition-name: plan-out; }
.plan-out h4 { margin: 10px 0 0; font: 800 20px/1 var(--display); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.plan-empty { display: grid; justify-items: start; gap: 10px; padding: 12px 4px; }
.plan-empty-art { display: flex; gap: 6px; }
.plan-empty-art svg { width: 110px; height: auto; opacity: .7; }
.plan-empty h3 { margin: 0; font: 900 clamp(34px, 3.4vw, 48px)/.95 var(--display); text-transform: uppercase; }
.plan-empty p { margin: 0; max-width: 46ch; color: var(--muted); }
.family svg polygon, .plan-machine svg polygon, .plan-empty-art svg polygon { stroke: var(--line-2); stroke-width: 1; }
.plan-head { display: grid; grid-template-columns: 120px 1fr; align-items: center; gap: 18px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.plan-machine svg { width: 120px; height: auto; display: block; }
.plan-machine .shell .f-t, .plan-empty-art .shell .f-t { fill: color-mix(in srgb, var(--copper) 30%, var(--iron-2)); }
.plan-machine .shell .f-l, .plan-machine .shell .f-r { fill: var(--iron-2); }
.plan-machine .board polygon { fill: #1F2A26; stroke: var(--verdigris); }
.plan-machine .cooler polygon { fill: color-mix(in srgb, var(--copper) 45%, var(--iron-2)); }
.plan-machine .vent, .plan-machine .trace { stroke: var(--copper-hot); }
.plan-head h3 { margin: 6px 0 4px; font: 900 clamp(34px, 3.6vw, 52px)/.92 var(--display); text-transform: uppercase; }
.plan-head h3 span { color: var(--copper-hot); }
.plan-head p { margin: 0; color: var(--muted); font-size: 14.5px; }
.keep { margin: 0; padding: 12px 14px; border-left: 4px solid var(--verdigris); background: var(--iron-2); font-size: 14.5px; color: var(--muted); }
.keep b { color: var(--bone); }
.plan-tally { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 18px; font-size: 14px; color: var(--muted); }
.plan-tally b { font: 900 26px/1 var(--display); color: var(--bone); margin-right: 4px; }
.prog { flex: 1 1 120px; height: 8px; background: var(--iron-2); position: relative; }
.prog i { position: absolute; inset: 0 auto 0 0; width: calc(var(--p, 0) * 100%); background: var(--verdigris); transition: width .7s var(--ease); }
.items { margin: 0; padding: 0; list-style: none; display: grid; gap: 6px; counter-reset: it; }
.item { counter-increment: it; display: grid; grid-template-columns: 34px 1fr; gap: 12px; padding: 14px 16px; background: var(--iron-2); border-left: 4px solid var(--copper); animation: cool-in .45s var(--ease) both; animation-delay: calc(var(--i, 0) * 45ms); transition: opacity .3s, border-color .3s; }
.item.optional { border-left-color: var(--line-2); }
.item.have { border-left-color: var(--verdigris); }
.item.got { opacity: .6; border-left-color: var(--verdigris); }
.item.got .item-body > b { text-decoration: line-through; text-decoration-color: var(--verdigris); }
.got-box input { width: 22px; height: 22px; margin: 2px 0 0; accent-color: var(--verdigris); cursor: pointer; }
.own-tag { grid-row: span 2; align-self: start; padding: 4px 0; background: var(--verdigris); color: var(--graphite); font: 800 11px/1.1 var(--display); letter-spacing: .06em; text-transform: uppercase; text-align: center; }
.item-body { display: grid; gap: 3px; min-width: 0; }
.item-body > b { font-size: 16px; line-height: 1.3; }
.item-body > b em { margin-left: 6px; padding: 1px 6px; border: 1px solid var(--line-2); font: 600 11px/1.4 var(--body); letter-spacing: .1em; text-transform: uppercase; color: var(--dim); }
.item .spec { color: var(--copper-hot); font-size: 13.5px; }
.item small { color: var(--muted); font-size: 13.5px; line-height: 1.45; }
.find { margin-top: 6px; }
.find summary { cursor: pointer; color: var(--muted); font-size: 13px; font-weight: 600; }
.find[open] summary { color: var(--bone); margin-bottom: 8px; }
.skip-h { color: var(--trap) !important; }
.skips { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 6px; }
.skips li { display: grid; gap: 3px; padding: 12px 14px; border: 1px dashed var(--line-2); animation: rise .4s var(--ease) both; animation-delay: calc(var(--i, 0) * 40ms); }
.skips b { font-size: 14.5px; text-decoration: line-through; text-decoration-color: var(--trap); text-decoration-thickness: 2px; }
.skips small { color: var(--muted); font-size: 13px; line-height: 1.45; }
.plan-this { align-self: start; margin: 18px 0 6px; }

.toast { position: fixed; z-index: 40; left: 50%; top: 84px; padding: 12px 18px; background: var(--copper); color: var(--graphite); font-weight: 700; transform: translate(-50%, -20px); opacity: 0; pointer-events: none; transition: transform .35s var(--ease), opacity .35s; }
.toast.show { transform: translate(-50%, 0); opacity: 1; }
.foot { position: relative; z-index: 1; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; padding: 22px var(--gutter) 30px; border-top: 1px solid var(--line); font-size: 13px; }
.foot .muted { max-width: 80ch; }

::view-transition-old(root), ::view-transition-new(root) { animation-duration: .4s; animation-timing-function: var(--ease); }
::view-transition-group(*) { animation-duration: .45s; animation-timing-function: var(--ease); }

@media (max-width: 1000px) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .hero-art { max-width: 520px; justify-self: center; width: 100%; }
  .tiers { grid-template-columns: minmax(0, 1fr); }
  .route-cols { grid-template-columns: minmax(0, 1fr); }
  .families { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tracks { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .fit-grid { grid-template-columns: minmax(0, 1fr); }
  .readout { position: static; }
  .plan-grid { grid-template-columns: minmax(0, 1fr); }
  .plan-out { position: static; }
}
@media (max-width: 640px) {
  .buy-row { grid-template-columns: 1fr; }
  .country { order: 3; }
  .fix-cta { grid-template-columns: 1fr; }
  .fix-cta i { display: none; }
  .route-open, .fix-open { padding: 18px; }
  .thermo { min-width: 0; width: 100%; }
  .top { flex-wrap: wrap; gap: 6px 16px; padding-block: 10px; }
  .top-nav { margin-left: 0; gap: 2px 16px; font-size: 14px; }
  .families { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .tracks { grid-template-columns: minmax(0, 1fr); }
  .tracks-big .track { grid-template-columns: 56px 1fr; }
  .tracks-big .track em { grid-column: 2; }
  .sink { height: 70px; gap: 6px; }
  .row { grid-template-columns: 60px 1fr; padding: 12px; }
  .specs { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
  .plan-out { padding: 16px; }
  .plan-head { grid-template-columns: 76px 1fr; gap: 12px; }
  .plan-machine svg { width: 76px; }
  .item { padding: 12px; gap: 10px; }
  .goal-grid { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 1ms !important; animation-delay: 0ms !important; transition-duration: 1ms !important; }
  .airflow { display: none; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}

/* Lessons: a track's lessons under the track cards. */
.tracks-big .track { font: inherit; color: inherit; text-align: left; cursor: pointer; border-left: 0; border-right: 0; border-bottom: 0; }
.tracks-big .track[aria-pressed="true"] { background: var(--line-2); }
.lessons-list { margin-top: 28px; display: grid; gap: 12px; }
.lessons-list h3 { font: 800 22px/1.2 var(--display); margin: 0 0 4px; }
.lesson { background: var(--iron); border-left: 4px solid var(--copper); padding: 14px 20px; }
.lesson summary { cursor: pointer; font-weight: 700; font-size: 17px; display: flex; gap: 12px; align-items: baseline; }
.lesson summary span { color: var(--copper); font: 800 15px/1 var(--display); }
.lesson .why { color: var(--muted); margin: 10px 0; line-height: 1.55; }
.lesson ol { margin: 0 0 10px; padding-left: 22px; line-height: 1.6; }
.lesson pre { background: #0b0a09; border: 1px solid var(--line-2); padding: 12px 14px; overflow-x: auto; font-size: 13px; line-height: 1.5; margin: 0 0 10px; }
.lesson .check { margin: 0; font-size: 14px; }
.lesson .check b { color: var(--verdigris); }

.lesson-art { margin: 6px 0 14px; background: #0f0d0c; border: 1px solid var(--line-2); padding: 12px; }
.lesson-art svg { display: block; width: 100%; height: auto; max-width: 640px; }
.fix-lesson { margin: 14px 0 0; font-size: 15px; }
.fix-lesson a { color: var(--copper); }