:root {
  --ink: #efe9dc;                 /* primary: warm off-white */
  --ink-2: #b9b4a6;               /* secondary: clearly readable */
  --ink-3: #847f74;               /* metadata */
  --deep: #04100f;
  --line: rgba(239, 233, 220, 0.14);
  --line-2: rgba(239, 233, 220, 0.28);
  --accent: #d2b878;
  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "IBM Plex Sans", -apple-system, system-ui, sans-serif;
  --pad: clamp(20px, 5vw, 72px);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; background: var(--deep); color: var(--ink); }
body { font-family: var(--sans); font-weight: 400; font-size: 16px; line-height: 1.5; -webkit-font-smoothing: antialiased; cursor: none; overflow-x: hidden; }
@media (hover: none) { body { cursor: auto; } }
a { color: inherit; }
::selection { background: rgba(210,184,120,0.35); }

#tank { position: fixed; inset: 0; width: 100%; height: 100%; display: block; z-index: 0; }
#veil { position: fixed; inset: 0; background: var(--deep); opacity: 0; pointer-events: none; z-index: 1; transition: opacity .25s linear; }

/* mast */
.mast { position: fixed; top: 0; left: 0; right: 0; z-index: 5; display: flex; justify-content: space-between; align-items: center; padding: 24px var(--pad); }
.wordmark { color: var(--ink); text-decoration: none; font-weight: 600; letter-spacing: 0.32em; font-size: 12px; text-indent: 0.32em; }
.nav { display: flex; gap: 26px; opacity: 0; transform: translateY(-4px); transition: opacity .5s, transform .5s; pointer-events: none; }
.nav a { font-size: 12px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2); text-decoration: none; }
.nav a:hover { color: var(--ink); }
.mast.scrolled .nav { opacity: 1; transform: none; pointer-events: auto; }

main { position: relative; z-index: 2; }

/* 01 hero — emotional voice */
.hero { min-height: 100svh; display: flex; flex-direction: column; justify-content: flex-end; padding: 0 var(--pad) 13vh; pointer-events: none; }
.hero > * { pointer-events: auto; }
.eyebrow { margin: 0 0 20px; font-size: 12px; font-weight: 500; letter-spacing: 0.2em; text-transform: uppercase; color: var(--ink-2); }
h1 { margin: 0 0 22px; font-family: var(--serif); font-weight: 300; font-size: clamp(52px, 8vw, 120px); line-height: 0.96; letter-spacing: -0.02em; max-width: 11ch; }
.support { margin: 0 0 36px; font-size: clamp(17px, 1.35vw, 21px); font-weight: 400; color: var(--ink-2); max-width: 36ch; }
.cta { display: inline-flex; align-items: center; gap: 10px; font-size: 12px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink); text-decoration: none; padding: 12px 0; border-bottom: 1px solid var(--line-2); width: max-content; transition: gap .3s, border-color .3s; }
.cta:hover { gap: 16px; border-color: var(--ink); }
.hint { position: absolute; right: var(--pad); bottom: 36px; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); opacity: 0; transition: opacity 1.2s; }
.hint.show { opacity: 0.8; }

/* blocks — operational voice */
.block { padding: clamp(88px, 12vh, 160px) var(--pad); }
.label { margin: 0 0 28px; font-size: 12px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3); }
h2 { margin: 0 0 24px; font-family: var(--sans); font-weight: 500; font-size: clamp(30px, 3.6vw, 52px); line-height: 1.08; letter-spacing: -0.02em; max-width: 24ch; text-wrap: balance; }
h2.serif { font-family: var(--serif); font-weight: 300; font-size: clamp(48px, 7vw, 104px); line-height: 0.98; letter-spacing: -0.02em; max-width: none; }
h2.big { font-weight: 600; font-size: clamp(72px, 13vw, 200px); line-height: 0.9; letter-spacing: -0.04em; font-variant-numeric: tabular-nums; margin-bottom: 30px; }
h2.big span { font-size: 0.32em; font-weight: 500; letter-spacing: 0.08em; text-transform: uppercase; vertical-align: 0.15em; margin-left: 0.2em; color: var(--ink-2); }
.body { margin: 0; font-size: clamp(16px, 1.2vw, 19px); line-height: 1.55; color: var(--ink-2); max-width: 60ch; }
.claim { margin: 0 0 44px; font-size: clamp(18px, 1.5vw, 24px); line-height: 1.4; color: var(--ink); max-width: 46ch; }
.bold-line { margin: 48px 0 0; font-size: clamp(22px, 2.2vw, 34px); font-weight: 500; letter-spacing: -0.015em; color: var(--ink); }
.center { text-align: center; margin-left: auto; margin-right: auto; }

/* 02 chain — brutalist grid */
.chain { border-top: 1px solid var(--line); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); border-top: 1px solid var(--line-2); border-left: 1px solid var(--line); }
.steps li { display: grid; gap: 10px; padding: 22px 20px 26px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); align-content: start; min-height: 150px; }
.steps .n { font-size: 11px; letter-spacing: 0.16em; color: var(--accent); font-variant-numeric: tabular-nums; }
.steps b { font-weight: 600; font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; }
.steps span:last-child { font-size: 14px; color: var(--ink-2); line-height: 1.45; }

/* 03 model */
.compare { display: grid; gap: 0; border-top: 1px solid var(--line-2); margin-bottom: 44px; max-width: 980px; }
.row { display: grid; grid-template-columns: 120px 1fr; gap: 24px; align-items: baseline; padding: 20px 0; border-bottom: 1px solid var(--line); }
.row .tag { font-size: 11px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-3); }
.row.ours .tag { color: var(--accent); }
.flow { margin: 0; font-size: clamp(14px, 1.3vw, 18px); font-weight: 500; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2); display: flex; flex-wrap: wrap; gap: 8px 12px; }
.row.ours .flow { color: var(--ink); }
.flow i { font-style: normal; color: var(--ink-3); }
.row.ours .flow i { color: var(--accent); }

/* 04 species */
.split { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr); gap: 56px; align-items: start; max-width: 1180px; }
.lifecycle { margin: 40px 0 0; color: var(--ink); }
.lifecycle svg { width: 100%; height: auto; display: block; }
.stages { list-style: none; margin: 8px 0 0; padding: 0; display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 8px; }
.stages li { display: grid; gap: 4px; }
.stages b { font-weight: 600; font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; }
.stages span { font-size: 12px; color: var(--ink-3); line-height: 1.4; }
.data { margin: 0; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line-2); border-left: 1px solid var(--line); }
.data div { padding: 20px 20px 24px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); display: grid; gap: 6px; align-content: start; }
dt { font-size: 11px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); }
dd { margin: 0; }
dd.num { font-size: clamp(36px, 3.6vw, 56px); font-weight: 600; letter-spacing: -0.03em; line-height: 1; font-variant-numeric: tabular-nums; white-space: nowrap; }
dd.num small { font-size: 0.42em; font-weight: 500; letter-spacing: 0.04em; margin-left: 4px; color: var(--ink-2); }
dd.sub { font-size: 13px; color: var(--ink-2); line-height: 1.4; }

/* 05 moonshot — emotional voice */
.moonshot { text-align: center; padding-top: clamp(120px, 18vh, 220px); padding-bottom: clamp(120px, 18vh, 220px); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.moonshot .body { max-width: 62ch; margin: 0 auto 40px; }
.moonshot .body em { font-style: italic; }
.loop { margin: 0 auto 44px; font-size: 13px; font-weight: 500; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-2); display: flex; justify-content: center; flex-wrap: wrap; gap: 8px 12px; }
.loop i { font-style: normal; color: var(--accent); }
.moonshot .bold-line { margin-top: 0; }

/* 06 farm — table + schematic */
.farm-split { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: start; }
.spec { width: 100%; border-collapse: collapse; border-top: 1px solid var(--line-2); }
.spec th, .spec td { text-align: left; padding: 14px 0; border-bottom: 1px solid var(--line); vertical-align: top; font-size: 15px; line-height: 1.45; }
.spec th { width: 34%; font-weight: 500; font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); padding-top: 17px; }
.spec td { color: var(--ink); }
.schematic { margin: 0; color: var(--ink-2); }
.schematic svg { width: 100%; height: auto; display: block; }
.schematic .t text { font-family: var(--sans); font-size: 11px; font-weight: 500; letter-spacing: 1.4px; }
.schematic .t text.s { font-size: 9.5px; font-weight: 400; letter-spacing: 0.4px; fill: var(--ink-3); }

/* 06 heat reuse */
.heat { border-top: 1px solid var(--line); }
.heat-split { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); align-items: start; }
h2.caps { text-transform: uppercase; letter-spacing: 0.01em; font-weight: 600; font-size: clamp(28px, 3.4vw, 50px); line-height: 1.04; max-width: 14ch; }
.heat .body + .body { margin-top: 18px; }
.status-lines { margin: 36px 0 0; display: grid; gap: 0; border-top: 1px solid var(--line-2); max-width: 60ch; }
.status-lines div { display: grid; grid-template-columns: 110px 1fr; gap: 16px; padding: 14px 0; border-bottom: 1px solid var(--line); }
.status-lines dd { font-size: 15px; color: var(--ink-2); line-height: 1.45; }
.heatflow { margin: 0; color: var(--ink-2); }
.heatflow svg { width: 100%; max-width: 420px; height: auto; display: block; margin: 0 auto; }
.heatflow .t text { font-family: var(--sans); font-size: 11px; font-weight: 500; letter-spacing: 1.4px; }
.heatflow .t text.s { font-size: 9.5px; font-weight: 400; letter-spacing: 0.4px; fill: var(--ink-3); }
.heatflow .hx { stroke: var(--ink); stroke-width: 1.6; }
.heatflow .warm { stroke: var(--accent); stroke-opacity: .85; }
.heatflow .cool { stroke: #5fa89a; stroke-opacity: .85; }
.transition { margin: 56px 0 0; font-size: 15px; color: var(--ink-3); }

/* cursor dot */
#cursor { position: fixed; left: 0; top: 0; width: 7px; height: 7px; margin: -3.5px 0 0 -3.5px; border-radius: 50%; background: var(--ink); box-shadow: 0 0 18px 6px rgba(239,233,220,0.18); pointer-events: none; z-index: 9; opacity: 0; transition: opacity .3s; mix-blend-mode: screen; }
#cursor.on { opacity: 0.9; }
@media (hover: none) { #cursor { display: none; } }

/* 08 status */
.status { list-style: none; margin: 0; padding: 0; max-width: 980px; border-top: 1px solid var(--line-2); }
.status li { display: grid; grid-template-columns: 90px 1fr 120px; gap: 20px; padding: 18px 0; border-bottom: 1px solid var(--line); align-items: baseline; }
.status .when { font-size: 12px; font-weight: 500; letter-spacing: 0.14em; color: var(--ink-3); font-variant-numeric: tabular-nums; }
.status .what { font-size: 17px; color: var(--ink); }
.status .state { font-size: 11px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); text-align: right; }
.status li.now .state, .status li.now .when { color: var(--accent); }

/* 08 follow */
.signup { display: flex; align-items: stretch; width: min(560px, 100%); border-bottom: 1px solid var(--line-2); padding: 2px 0; margin-top: 36px; }
.signup input { flex: 1; min-width: 0; background: transparent; border: 0; outline: 0; color: var(--ink); font-family: var(--sans); font-size: 18px; padding: 12px 0; }
.signup input::placeholder { color: var(--ink-3); }
.signup input.bad { animation: shake .3s; }
@keyframes shake { 25% { transform: translateX(-4px); } 75% { transform: translateX(4px); } }
.signup button { background: transparent; border: 0; color: var(--ink); font-family: var(--sans); font-size: 12px; font-weight: 500; letter-spacing: 0.16em; text-transform: uppercase; cursor: none; padding: 0 0 0 16px; display: inline-flex; gap: 8px; align-items: center; }
.signup button:hover { color: var(--accent); }
.signup button:disabled { color: var(--ink-3); }
@media (hover: none) { .signup button, .chips button { cursor: auto; } }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.after { margin-top: 36px; }
.after p { font-size: 17px; color: var(--ink-2); margin: 0 0 18px; max-width: 52ch; }
.chips { display: flex; flex-wrap: wrap; gap: 10px; }
.chips button { background: transparent; border: 1px solid var(--line-2); color: var(--ink-2); padding: 10px 16px; font-family: var(--sans); font-size: 12px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; cursor: none; transition: border-color .25s, color .25s; }
.chips button:hover { border-color: var(--ink); color: var(--ink); }
.chips button.on { border-color: var(--accent); color: var(--accent); }
.chips button:disabled:not(.on) { opacity: .4; }

/* footer */
.foot { position: relative; z-index: 2; padding: 64px var(--pad) 40px; border-top: 1px solid var(--line-2); display: grid; grid-template-columns: minmax(0, 1.4fr) auto; gap: 28px 60px; align-items: start; background: var(--deep); }
.foot-brand { display: grid; gap: 14px; }
.statement { margin: 0; font-size: 17px; line-height: 1.5; color: var(--ink-2); max-width: 56ch; }
.foot-nav { display: flex; flex-wrap: wrap; gap: 22px; }
.foot-nav a { font-size: 12px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-2); text-decoration: none; }
.foot-nav a:hover { color: var(--ink); }
.foot-meta { grid-column: 1 / -1; display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); padding-top: 28px; border-top: 1px solid var(--line); }
.credit a { color: inherit; text-decoration: none; border-bottom: 1px solid var(--line); }
.noscript { position: relative; z-index: 3; padding: 20px var(--pad); color: var(--ink-2); }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
:focus-visible { outline: 1px solid var(--accent); outline-offset: 4px; }

/* ---- mobile ---- */
@media (max-width: 820px) {
  .mast { padding: 18px var(--pad); }
  .nav { gap: 16px; }
  .nav a:not(:last-child) { display: none; }
  .hero { padding-bottom: 12vh; }
  h1 { font-size: clamp(44px, 13.5vw, 64px); max-width: 10ch; }
  .hint { display: none; }
  .block { padding: 72px var(--pad); }
  h2 { font-size: clamp(28px, 7.5vw, 36px); }
  h2.big { font-size: clamp(64px, 22vw, 96px); }
  h2.serif { font-size: clamp(44px, 13vw, 64px); }
  .steps { grid-template-columns: 1fr; border-left: 0; }
  .steps li { grid-template-columns: 40px 1fr; grid-template-rows: auto auto; min-height: 0; padding: 16px 0; border-right: 0; }
  .steps li .n { grid-row: 1 / span 2; }
  .row { grid-template-columns: 1fr; gap: 8px; }
  .split, .farm-split, .heat-split { grid-template-columns: 1fr; gap: 36px; }
  h2.caps { font-size: clamp(26px, 7.4vw, 34px); max-width: none; }
  .status-lines div { grid-template-columns: 90px 1fr; }
  .stages { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px 8px; }
  .data { grid-template-columns: 1fr 1fr; }
  dd.num { font-size: 40px; }
  .status li { grid-template-columns: 64px 1fr; }
  .status .state { grid-column: 2; text-align: left; }
  .foot { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } .nav, .cta, .hint, #veil { transition: none; } }