/* AVOS — page layer over stage.css. A spec should look like one: calm, exact, dark slate, one cyan. */
:root {
  --canvas: #0a0e14;
  --surface: #0f1620;
  --surface-2: #142030;
  --line: #1d2a3a;
  --line-2: #293a50;
  --ink: #e9f2f8;
  --ink-soft: #a2b3c5;
  --ink-faint: #74869c;
  --accent: #71d7ee;
  --accent-ink: #062029;
  --good: #7fd9a6;
  --bad: #ff9b86;
  --font-display: "IBM Plex Sans", system-ui, sans-serif;
  --font-text: "IBM Plex Sans", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --wrap: 1180px;
  --t-3xl: clamp(2.7rem, 1.4rem + 4.6vw, 5.4rem);
  --t-2xl: clamp(2rem, 1.25rem + 2.7vw, 3.5rem);
  --t-xl: clamp(1.45rem, 1.1rem + 1.1vw, 2rem);
  --track-tight: -0.028em;
}
body { background: var(--canvas); }
.wrap { width: min(100% - 2 * var(--gutter), var(--wrap)); margin-inline: auto; }
.skip { position: absolute; left: -999px; top: 8px; }
.skip:focus { left: 8px; z-index: 100; background: var(--ink); color: var(--canvas); padding: 8px 12px; }
h1, h2, h3 { font-weight: 600; }
h1 { line-height: 0.98; letter-spacing: -0.035em; }
h3 { font-size: 1.15rem; line-height: 1.3; letter-spacing: -0.01em; }
.h-md { font-size: var(--t-xl); }
.accent { color: var(--accent); }
.eyebrow, .tag, .role, .aud, .st, .vk, .draft-pill { font-family: var(--font-mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; }
.eyebrow { color: var(--accent); }
.note { margin-top: 14px; font-size: 0.84rem; color: var(--ink-faint); }
[data-act="flow"] { padding-inline: 0; }

/* buttons / links */
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; border-radius: 8px;
  background: var(--accent); color: var(--accent-ink); font: 600 0.95rem/1 var(--font-text); text-decoration: none; border: 0; cursor: pointer;
  transition: background .2s var(--ease), transform .2s var(--ease); }
.btn:hover { background: #95e4f5; } .btn:active { transform: translateY(1px); }
.btn.lg { min-height: 52px; padding: 0 26px; font-size: 1rem; }
.btn.small { min-height: 38px; padding: 0 16px; font-size: 0.88rem; }
.link { color: var(--ink); text-decoration: none; border-bottom: 1px solid var(--line-2); padding-bottom: 3px; font-weight: 500; }
.link:hover { border-color: var(--accent); }

/* nav */
.nav { position: sticky; top: 0; z-index: 50; background: color-mix(in srgb, var(--canvas) 88%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--line); }
.nav-in { display: flex; align-items: center; gap: var(--s5); min-height: 68px; }
.logo { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font: 600 1.1rem var(--font-mono); letter-spacing: 0.06em; }
.logo img { border-radius: 6px; }
.draft-pill { color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); padding: 4px 8px; border-radius: 999px; font-size: 0.68rem; }
.nav nav { display: flex; gap: var(--s6); margin-left: auto; }
.nav nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.92rem; }
.nav nav a:hover, .nav nav a[aria-current] { color: var(--ink); }
.nav-cta { display: flex; gap: 8px; margin-left: var(--s4); }
.btn.ghost { background: transparent; color: var(--ink); border: 1px solid var(--line-2); }
.btn.ghost:hover { border-color: var(--accent); background: transparent; }

/* code */
.code-card { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; box-shadow: 0 30px 80px -50px #000; }
.code-bar { display: flex; justify-content: space-between; align-items: center; padding: 11px 16px; border-bottom: 1px solid var(--line); font: 0.8rem var(--font-mono); color: var(--ink-soft); }
.code-bar .tag { color: var(--accent); font-size: 0.66rem; }
.code-card pre { margin: 0; padding: 18px 16px; overflow-x: auto; font: 12.5px/1.75 var(--font-mono); color: var(--ink-soft); }
.code-card figcaption { padding: 0 16px 14px; font-size: 0.8rem; color: var(--ink-faint); }
.t-k { color: #cfe3ef; } .t-s { color: var(--accent); } .t-n { color: #ffcf8a; } .t-c { color: var(--ink-faint); }
ins { text-decoration: none; color: var(--good); display: block; }

/* 1 · hero */
.hero { padding-block: clamp(56px, 10vh, 112px) clamp(72px, 12vh, 136px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr); gap: clamp(40px, 5vw, 80px); align-items: center; }
.hero h1 { font-size: clamp(2.6rem, 1.4rem + 3.6vw, 4.5rem); margin-top: var(--s5); }
.lede { margin-top: var(--s6); font-size: clamp(1.02rem, 0.95rem + 0.35vw, 1.2rem); line-height: 1.6; color: var(--ink-soft); max-width: 34em; }
.actions { display: flex; align-items: center; gap: var(--s6); margin-top: var(--s7); flex-wrap: wrap; }

/* 2 · problem (reveal) */
.problem .stage { display: grid; grid-template-columns: minmax(0, 1fr); align-content: center; gap: var(--s7); padding-block: 88px 32px; }
.prob-head { display: grid; grid-template-columns: 1.1fr 1fr; gap: var(--s8); align-items: end; }
.prob-head h2 { font-size: var(--t-2xl); letter-spacing: -0.03em; }
.prob-head p { color: var(--ink-soft); }
.views { position: relative; border: 1px solid var(--line); border-radius: 14px; overflow: hidden; background: var(--surface); }
.views-layer { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 28px; }
.views-layer.after { position: absolute; inset: 0; background: color-mix(in srgb, var(--surface-2) 70%, var(--surface)); }
.vcard { background: var(--canvas); border: 1px solid var(--line); border-radius: 10px; padding: 18px; min-height: 150px; }
.vk { color: var(--ink-faint); margin-bottom: 12px; }
.vrow { font: 0.86rem/1.9 var(--font-mono); color: var(--ink-soft); }
.vrow b { font-weight: 500; color: var(--ink); }
.vrow b.bad { color: var(--bad); text-decoration: underline wavy color-mix(in srgb, var(--bad) 60%, transparent); text-underline-offset: 4px; }
.vrow b.good { color: var(--good); }
.views-note { grid-column: 1 / -1; font: 500 0.95rem var(--font-text); }
.bad-note { color: var(--bad); } .good-note { color: var(--good); }
.views .seam { position: absolute; top: 0; bottom: 0; left: calc(var(--pin, 0) * 100%); width: 2px; background: var(--accent); box-shadow: 0 0 22px var(--accent); }

/* 3 · the record (pin, peak) */
.record .stage { display: grid; grid-template-columns: minmax(0, 1fr); align-content: center; gap: var(--s6); padding-block: 84px 24px; }
.rec-head h2 { font-size: var(--t-2xl); margin-top: var(--s3); letter-spacing: -0.03em; }
.rec-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 28px; align-items: stretch; }
.rec-diagram { display: flex; flex-direction: column; justify-content: center; }
.rec-diagram { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 10px; }
.rec-code pre { font-size: 11.5px; line-height: 1.7; }
/* each part k brightens while the scroll is on it: --a runs 0→1 across its slice */
.record .k0 { --k: 0; } .record .k1 { --k: 1; } .record .k2 { --k: 2; } .record .k3 { --k: 3; } .record .k4 { --k: 4; }
.record [class*=" k"], .record [class^="k"] { --a: calc(var(--pin, 1) * 5.4 - 0.2 - var(--k)); }
.rec-code .hl { opacity: clamp(0.3, calc(var(--a) * 20 + 1), 1); display: inline;
  background: color-mix(in srgb, var(--accent) calc(clamp(0, 1 - max(var(--a) - 0.5, 0.5 - var(--a)) * 2, 1) * 16%), transparent); }
.room-schem .k0, .room-schem .k1, .room-schem .k2, .room-schem .k3, .room-schem .k4 { opacity: clamp(0.18, calc(var(--a) * 20 + 1), 1); }
.caps { position: relative; min-height: 96px; margin: 18px 14px 8px; }
.cap { position: absolute; inset: 0 auto auto 0; font-size: 1.05rem; line-height: 1.55; color: var(--ink-soft); opacity: clamp(0, min(calc(var(--a) * 8), calc((1 - var(--a)) * 8)), 1); }
.cap b { color: var(--ink); font-weight: 600; }
.record .cap.k4 { opacity: clamp(0, calc(var(--a) * 8), 1); }
.ss-reduced .cap { position: static; opacity: 1; margin-bottom: 8px; }
.ss-reduced .caps { min-height: 0; }
.schem { width: 100%; height: auto; display: block; font-family: var(--font-mono); }
.schem .gridline { stroke: #ffffff06; }
.schem .box { fill: #111b27; stroke: var(--line-2); stroke-width: 1.2; }
.schem .did { fill: var(--accent); font-size: 11px; letter-spacing: 0.06em; }
.schem .dname { fill: var(--ink); font: 500 14px var(--font-text); }
.schem .pname { fill: var(--ink-soft); font-size: 10.5px; }
.schem .ptype { fill: var(--ink-faint); font-size: 9.5px; }
.schem .pin { fill: var(--line-2); }
.schem .wire path { fill: none; stroke: var(--accent); stroke-width: 2; }
.schem .wire .dot { fill: var(--accent); }
.schem .wlabel { fill: var(--ink); font-size: 10.5px; font-weight: 500; }
.schem .space { fill: none; stroke: color-mix(in srgb, var(--accent) 45%, transparent); stroke-dasharray: 6 5; }
.schem .space-k { fill: var(--accent); font-size: 12px; letter-spacing: 0.04em; }
.schem .intent { fill: var(--ink-soft); font-size: 11px; }
.schem .prod { fill: #ffcf8a; font-size: 10.5px; letter-spacing: 0.04em; }
.schem .badge { fill: #1a2433; stroke: var(--line-2); }
.schem .badge-t { fill: var(--ink-soft); font-size: 11px; }

/* 4 · lifecycle (pan) */
.life .stage { display: grid; grid-template-columns: minmax(0, 1fr); grid-template-rows: auto auto; align-content: center; gap: var(--s7); padding-block: 96px 32px; }
.life-head { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s8); align-items: end; }
.life-head h2 { font-size: var(--t-2xl); letter-spacing: -0.03em; }
.life-head p { color: var(--ink-soft); }
.rail { align-items: stretch; height: auto; gap: 18px; padding-left: max(var(--gutter), calc((100vw - var(--wrap)) / 2)); }
.stage-card { flex: 0 0 clamp(280px, 28vw, 360px); background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 24px; display: flex; flex-direction: column; gap: 12px; }
.stage-card .role { color: var(--accent); display: flex; gap: 10px; } .role span { color: var(--ink-faint); }
.stage-card > p:not(.role) { color: var(--ink-soft); font-size: 0.95rem; }
.stage-card pre { margin: auto 0 0; padding: 14px; border-radius: 8px; background: var(--canvas); border: 1px solid var(--line); font: 12px/1.7 var(--font-mono); overflow-x: auto; }
.stage-card.loop { background: transparent; border-style: dashed; justify-content: center; }
.stage-card.loop h3 { font-size: 1.3rem; }

/* 5 · who */
.who { padding-block: clamp(104px, 16vh, 180px) clamp(56px, 9vh, 104px); }
.split-head { display: grid; grid-template-columns: 1.1fr 1fr; gap: var(--s8); align-items: end; margin-bottom: var(--s8); }
.split-head h2 { font-size: var(--t-2xl); letter-spacing: -0.03em; }
.split-head p { color: var(--ink-soft); }
.trio { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-top: 1px solid var(--line); }
.trio article { padding: var(--s6) var(--s6) 0 0; display: flex; flex-direction: column; }
.trio article + article { padding-left: var(--s6); border-left: 1px solid var(--line); }
.aud { color: var(--accent); }
.trio h3 { margin-top: var(--s4); }
.trio p:not(.aud) { margin-top: var(--s3); color: var(--ink-soft); font-size: 0.95rem; }
.go { margin-top: var(--s5); color: var(--ink); text-decoration: none; font-weight: 500; font-size: 0.92rem; }
.go::after { content: " →"; color: var(--accent); }

/* 6 · principles */
.principles { padding-block: clamp(56px, 9vh, 104px); }
.pr-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(40px, 6vw, 96px); }
.pr-list { margin: var(--s6) 0 0; display: grid; gap: 0; }
.pr-list div { padding: var(--s5) 0; border-top: 1px solid var(--line); display: grid; grid-template-columns: 14em 1fr; gap: var(--s5); }
.pr-list dt { font-weight: 600; } .pr-list dd { margin: 0; color: var(--ink-soft); font-size: 0.95rem; }
.status-list { list-style: none; margin: var(--s6) 0 0; padding: 0; display: grid; gap: 0; }
.status-list li { display: grid; grid-template-columns: 4.5em 1fr; gap: var(--s4); padding: var(--s5) 0; border-top: 1px solid var(--line); }
.status-list .st { color: var(--ink-faint); padding-top: 3px; }
.status-list .now .st { color: var(--accent); }
.status-list p { margin-top: 4px; color: var(--ink-soft); font-size: 0.95rem; }

/* 7 · docs directory */
.docdir { padding-block: clamp(40px, 7vh, 80px); }
.dd-grid { margin-top: var(--s6); display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.dd-grid a { display: flex; flex-direction: column; gap: 8px; padding: 22px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--ink); text-decoration: none; transition: border-color .2s var(--ease), transform .2s var(--ease); }
.dd-grid a:hover { border-color: var(--accent); transform: translateY(-2px); }
.dd-grid b::after { content: " →"; color: var(--accent); }
.dd-grid span { color: var(--ink-soft); font-size: 0.92rem; }

/* 8 · reach */
.reach { padding-block: clamp(56px, 9vh, 104px) clamp(88px, 14vh, 160px); }
.reach-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr); gap: 20px; align-items: start; }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: clamp(24px, 3vw, 36px); display: grid; gap: 8px; }
.panel > p { color: var(--ink-soft); margin-bottom: var(--s4); }
.panel label { font-size: 0.85rem; color: var(--ink-soft); margin-top: 8px; }
.panel input, .panel select, .panel textarea { width: 100%; min-height: 46px; padding: 10px 12px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--canvas); color: var(--ink); font: 1rem var(--font-text); }
.panel textarea { resize: vertical; min-height: 120px; }
.panel input:focus, .panel select:focus, .panel textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
.panel .btn { margin-top: var(--s4); justify-self: start; }
.two { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; } .two > div { display: grid; gap: 8px; }
.hp { position: absolute; left: -5000px; }
.form-note { font-size: 0.85rem; color: var(--ink-soft); min-height: 1.2em; }
.form-note.ok { color: var(--good); } .form-note.err { color: var(--bad); }

/* footer */
.foot { border-top: 1px solid var(--line); padding-block: 28px; }
.foot-in { display: flex; align-items: center; gap: var(--s7); flex-wrap: wrap; }
.foot nav { display: flex; gap: var(--s5); flex-wrap: wrap; }
.foot nav a { color: var(--ink-soft); text-decoration: none; font-size: 0.9rem; } .foot nav a:hover { color: var(--ink); }
.foot p { margin-left: auto; font-size: 0.84rem; color: var(--ink-faint); }

/* ── docs pages ─────────────────────────────────────────────────── */
.docs-shell { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: clamp(32px, 5vw, 72px); padding-block: clamp(40px, 7vh, 80px) clamp(72px, 12vh, 140px); }
.docs-side { position: sticky; top: 96px; align-self: start; display: grid; gap: 4px; }
.docs-side .eyebrow { margin-bottom: 10px; color: var(--ink-faint); }
.docs-side a { padding: 9px 12px; border-radius: 8px; color: var(--ink-soft); text-decoration: none; font-size: 0.95rem; }
.docs-side a:hover { color: var(--ink); background: var(--surface); }
.docs-side a[aria-current] { color: var(--ink); background: var(--surface-2); box-shadow: inset 2px 0 0 var(--accent); }
.docs-side .side-note { margin-top: 18px; padding: 14px; border: 1px solid var(--line); border-radius: 10px; font-size: 0.82rem; color: var(--ink-soft); }
.doc-main { max-width: 760px; }
.doc-main h1 { font-size: var(--t-2xl); margin-top: var(--s3); letter-spacing: -0.03em; }
.doc-main .sum { margin-top: var(--s5); font-size: var(--t-lg); color: var(--ink-soft); }
.callout { margin-top: var(--s7); padding: 16px 18px; border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); border-radius: 10px; background: color-mix(in srgb, var(--accent) 6%, transparent); font-size: 0.92rem; color: var(--ink-soft); }
.callout b { color: var(--ink); }
.doc-main section { margin-top: var(--s9); }
.doc-main h2 { font-size: var(--t-xl); letter-spacing: -0.02em; }
.doc-main section > p, .doc-main li { color: var(--ink-soft); margin-top: var(--s4); }
.doc-main ul, .doc-main ol { padding-left: 1.2em; }
.doc-main code { font-family: var(--font-mono); font-size: 0.88em; color: var(--accent); }
.doc-main .code-card { margin-top: var(--s5); }
.doc-main .code-card code { color: inherit; }
.facts { margin-top: var(--s5); display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.facts div { padding: 16px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); }
.facts b { display: block; } .facts span { display: block; margin-top: 6px; color: var(--ink-soft); font-size: 0.92rem; }
.dl { margin-top: var(--s5); display: grid; gap: 10px; }
.dl a { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 16px 18px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); text-decoration: none; }
.dl a:hover { border-color: var(--accent); }
.dl small { display: block; color: var(--ink-soft); font-size: 0.85rem; margin-top: 4px; }
.dl .get { font: 500 0.82rem var(--font-mono); color: var(--accent); white-space: nowrap; }
.next { margin-top: var(--s9); display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.next a { padding: 18px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); text-decoration: none; }
.next a:hover { border-color: var(--accent); }
.next small { display: block; color: var(--ink-soft); margin-top: 4px; }

/* ── phone ─────────────────────────────────────────────────────── */
@media (max-width: 960px) {
  .nav nav { display: none; }
  .nav-cta { margin-left: auto; }
  .hero-grid, .prob-head, .rec-grid, .life-head, .split-head, .pr-grid, .reach-grid { grid-template-columns: minmax(0, 1fr); gap: var(--s5); }
  .trio { grid-template-columns: 1fr; }
  .trio article + article { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); margin-top: var(--s6); }
  .dd-grid { grid-template-columns: 1fr 1fr; }
  .docs-shell { grid-template-columns: 1fr; }
  .docs-side { position: static; grid-auto-flow: column; overflow-x: auto; }
  .docs-side .eyebrow, .docs-side .side-note { display: none; }
}
@media (max-width: 700px) {
  .draft-pill { display: none; }
  .views-layer { grid-template-columns: 1fr; padding: 16px; gap: 10px; }
  .vcard { min-height: 0; padding: 14px; }
  .prob-head h2, .rec-head h2, .life-head h2 { font-size: var(--t-xl); }
  .prob-head p, .life-head p { font-size: 0.95rem; }
  .rec-code { display: none; }  /* the phone gets the room and the captions; the full record is one tap away in the docs */
  .caps { min-height: 96px; }
  .pr-list div { grid-template-columns: 1fr; gap: 6px; }
  .dd-grid, .two, .facts, .next { grid-template-columns: 1fr; }
  .foot p { margin-left: 0; }
}
@media (max-width: 700px) {
  .rec-diagram { overflow-x: auto; }
  .room-schem { min-width: 560px; }
}

@media (min-width: 961px) and (max-width: 1180px) { .trio { grid-template-columns: repeat(2, minmax(0, 1fr)); } .trio article:nth-child(3) { border-left: 0; padding-left: 0; } .trio article:nth-child(n+3) { margin-top: var(--s6); border-top: 1px solid var(--line); } }
@media (max-width: 420px) { .nav-cta .btn.ghost { display: none; } }