/* Prefill & the frame: Abhinav Pangaria's Stage 1 findings, Stage 2 proposal and application.
   Light-only by design (paper, ink, one blue accent). */
:root {
  --paper: #F7F7F7; --paper-2: #EFEFEF; --paper-3: #E7E7E7; --card: #FFFFFF;
  --ink: #1F1F1F; --ink-2: #5A5A5A; --ink-3: #696969; --ink-4: #9A9A9A; --black: #141414;
  --line: rgba(0,0,0,.08); --line-2: rgba(0,0,0,.14); --line-3: rgba(0,0,0,.30);
  --accent: #4B55DB; --accent-2: #3942C4; --accent-wash: rgba(75,85,219,.09);
  --lav: #DCD5FF; --peach: #FFD9C7; --butter: #FFF1A8; --sky: #BFD9FF; --rose: #FFC7EA; --mint: #CFF3E2;
  --good: #1C7A4C; --good-bg: #E3F4EA; --bad: #B3402D; --bad-bg: #FBE6E1; --warn: #8A5A00; --warn-bg: #FFF6D6;
  --idle: #E7E7E7; --prefill: #FFD9C7; --decode: #CFF3E2;
  --r-1: 8px; --r-2: 12px; --r-3: 16px; --r-4: 20px; --r-5: 28px;
  --shadow-1: 0 1px 1px rgba(0,0,0,.03), 0 2px 6px -2px rgba(0,0,0,.06);
  --shadow-2: 0 1px 2px rgba(0,0,0,.04), 0 10px 30px -12px rgba(0,0,0,.14);
  --frame: 0 0 0 1px rgba(0,0,0,.07), 0 18px 50px -22px rgba(0,0,0,.28);
  --ease: cubic-bezier(.16,1,.3,1);
  --max: 1180px; --narrow: 760px;
  --gutter: clamp(18px, 4vw, 40px);
  --serif: "Lora", Georgia, "Times New Roman", serif;
  --sans: "Inter Tight", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "DM Mono", ui-monospace, "SF Mono", Menlo, monospace;
  color-scheme: light;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.6 var(--sans); -webkit-font-smoothing: antialiased;
}
img, svg, canvas { max-width: 100%; }
a { color: inherit; text-decoration-color: var(--line-3); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--accent); color: var(--accent-2); }
[hidden] { display: none !important; }
::selection { background: var(--lav); }

.wrap { max-width: var(--max); margin: 0 auto; padding-left: max(var(--gutter), env(safe-area-inset-left, 0px)); padding-right: max(var(--gutter), env(safe-area-inset-right, 0px)); }
.narrow { max-width: var(--narrow); }

/* type */
h1, h2, h3 { font-family: var(--serif); font-weight: 600; color: var(--black); text-wrap: balance; margin: 0; }
h1 { font-size: clamp(42px, 6.6vw, 92px); line-height: 1.02; letter-spacing: -0.045em; }
h2 { font-size: clamp(32px, 4.4vw, 56px); line-height: 1.06; letter-spacing: -0.035em; }
h3 { font-size: clamp(21px, 2.1vw, 26px); line-height: 1.2; letter-spacing: -0.02em; }
h1 em, h2 em { font-style: italic; font-weight: 500; color: var(--accent); }
p { margin: 0; text-wrap: pretty; }
.lede { font-size: clamp(18px, 1.7vw, 21px); color: var(--ink-2); max-width: 62ch; line-height: 1.55; }
.muted { color: var(--ink-3); }
.small { font-size: 14.5px; }
.mono { font-family: var(--mono); }
.label {
  font: 500 12px/1.2 var(--mono); letter-spacing: .09em; text-transform: uppercase; color: var(--ink-3);
}
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px 6px 10px; border-radius: 999px;
  background: var(--card); box-shadow: var(--shadow-1); font: 500 12px/1 var(--mono); letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-2);
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.prose { display: grid; gap: 18px; max-width: 66ch; }
.prose strong { font-weight: 600; color: var(--black); }
code { font: 400 .88em var(--mono); background: var(--paper-2); padding: .1em .35em; border-radius: 5px; }

/* header + tabs */
body::before { content: ""; position: fixed; inset: 0 0 auto; height: env(safe-area-inset-top, 0px); background: var(--paper); z-index: 30; }
.top {
  position: sticky; top: env(safe-area-inset-top, 0px); z-index: 20;
  background: color-mix(in srgb, var(--paper) 86%, transparent); backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px); border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 12px; }
.brand { display: flex; align-items: baseline; gap: 10px; text-decoration: none; white-space: nowrap; }
.brand b { font: 600 19px/1 var(--serif); letter-spacing: -0.02em; color: var(--black); }
.brand span { font: 500 11px/1 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-4); }
.tabs { display: flex; gap: 4px; padding: 4px; background: var(--paper-2); border-radius: 999px; overflow-x: auto; scrollbar-width: none; }
.tabs::-webkit-scrollbar { display: none; }
.tabs a {
  font: 500 14px/1 var(--sans); padding: 9px 14px; border-radius: 999px; text-decoration: none; color: var(--ink-2);
  white-space: nowrap; transition: background .3s var(--ease), color .3s var(--ease), box-shadow .3s var(--ease);
}
.tabs a:hover { color: var(--black); }
.tabs a[aria-current="page"] { background: var(--card); color: var(--black); box-shadow: var(--shadow-1); }
@media (max-width: 720px) {
  .top .wrap { flex-direction: column; align-items: stretch; gap: 10px; }
  .brand span { display: none; }
  .tabs a { padding: 9px 11px; font-size: 13.5px; }
}

/* sections */
.view { animation: viewIn .7s var(--ease) both; }
@keyframes viewIn { from { opacity: 0; transform: translateY(10px); } }
.hero { padding-block: clamp(56px, 9vw, 120px) clamp(36px, 5vw, 64px); display: grid; gap: 26px; }
section.band { padding-block: clamp(48px, 7vw, 96px); border-top: 1px solid var(--line); }
section.band.alt { background: var(--paper-2); }
.head { display: grid; gap: 14px; margin-bottom: clamp(26px, 3.4vw, 44px); max-width: 70ch; }
.grid { display: grid; gap: 18px; }
.g2 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); }
.g3 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr)); }
.g4 { grid-template-columns: repeat(auto-fit, minmax(min(100%, 210px), 1fr)); }
.grid > * { min-width: 0; }

/* buttons, chips */
.btn {
  display: inline-flex; align-items: center; gap: 10px; padding: 13px 20px; border-radius: 999px; border: 0;
  background: var(--black); color: #fff; font: 500 15px/1 var(--sans); text-decoration: none; cursor: pointer;
  transition: transform .4s var(--ease), background .3s var(--ease);
}
.btn:hover { color: #fff; background: #000; transform: translateY(-1px); }
.btn .arr { transition: transform .4s var(--ease); }
.btn:hover .arr { transform: translateX(3px); }
.btn.ghost { background: transparent; color: var(--black); box-shadow: inset 0 0 0 1px var(--line-2); }
.btn.ghost:hover { background: var(--card); color: var(--black); }
.row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.chip {
  display: inline-flex; align-items: center; gap: 6px; padding: 5px 10px; border-radius: 999px;
  font: 500 12.5px/1.2 var(--mono); background: var(--card); box-shadow: inset 0 0 0 1px var(--line); color: var(--ink-2);
}
.chip.good { background: var(--good-bg); color: var(--good); box-shadow: none; }
.chip.bad { background: var(--bad-bg); color: var(--bad); box-shadow: none; }
.chip.warn { background: var(--warn-bg); color: var(--warn); box-shadow: none; }
.chip.accent { background: var(--accent-wash); color: var(--accent-2); box-shadow: none; }

/* cards */
.card { background: var(--card); border-radius: var(--r-4); box-shadow: var(--shadow-1); padding: clamp(20px, 2.4vw, 30px); display: grid; gap: 12px; align-content: start; }
.card.flat { box-shadow: inset 0 0 0 1px var(--line); }
.card .num { font: 600 clamp(40px, 4.6vw, 60px)/1 var(--serif); letter-spacing: -0.04em; color: var(--black); }
.card .num small { font-size: .42em; letter-spacing: -0.01em; color: var(--ink-3); font-weight: 500; }
.stat { display: grid; gap: 8px; }
.stat .num { font: 600 clamp(36px, 4vw, 52px)/1 var(--serif); letter-spacing: -0.04em; color: var(--black); }
.stat .num.bad { color: var(--bad); } .stat .num.good { color: var(--good); }
.step { display: grid; grid-template-columns: auto 1fr; gap: 4px 16px; align-items: baseline; }
.step .n { font: 500 13px/1 var(--mono); color: var(--accent); letter-spacing: .06em; grid-row: span 2; padding-top: 6px; }
.callout { border-left: 3px solid var(--accent); padding: 4px 0 4px 18px; color: var(--ink-2); max-width: 66ch; }
.callout.warn { border-color: var(--warn); }
.quote { font: italic 400 clamp(19px, 1.8vw, 23px)/1.5 var(--serif); color: var(--black); max-width: 60ch; }
.quote cite { display: block; margin-top: 10px; font: 500 12px/1.2 var(--mono); letter-spacing: .08em; text-transform: uppercase; color: var(--ink-3); font-style: normal; }

/* tables */
.tbl-wrap { overflow-x: auto; background: var(--card); border-radius: var(--r-3); box-shadow: var(--shadow-1); }
table { border-collapse: collapse; width: 100%; font-size: 14.5px; }
th, td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line); vertical-align: baseline; white-space: nowrap; }
th { font: 500 11.5px/1.2 var(--mono); letter-spacing: .07em; text-transform: uppercase; color: var(--ink-3); background: var(--paper); position: sticky; top: 0; }
td.n, th.n { text-align: right; font-variant-numeric: tabular-nums; }
tr:last-child td { border-bottom: 0; }
td.wrap-ok { white-space: normal; min-width: 220px; }
tbody tr:hover td { background: var(--paper); }
.meter { display: inline-flex; align-items: center; gap: 8px; justify-content: flex-end; width: 100%; }
.meter i { display: block; height: 6px; border-radius: 4px; background: var(--paper-3); width: 70px; position: relative; overflow: hidden; flex: none; }
.meter i b { position: absolute; inset: 0 auto 0 0; border-radius: 4px; background: var(--ink-3); }
.meter.hot i b { background: var(--bad); }
.meter.ok i b { background: var(--good); }
.cap { margin-top: 10px; font-size: 14px; color: var(--ink-3); max-width: 80ch; }
details.more { margin-top: 14px; }
details.more summary { cursor: pointer; font: 500 13px/1.2 var(--mono); letter-spacing: .05em; text-transform: uppercase; color: var(--ink-2); list-style: none; display: inline-flex; gap: 8px; align-items: center; }
details.more summary::before { content: "+"; font-size: 16px; color: var(--accent); }
details.more[open] summary::before { content: "−"; }
details.more > div { margin-top: 14px; }

/* comparison bars (findings) */
.bars { display: grid; gap: 14px; }
.bar-row { display: grid; grid-template-columns: minmax(120px, 210px) 1fr; gap: 6px 18px; align-items: center; }
.bar-row .name { font-size: 15px; color: var(--black); }
.bar-row .name small { display: block; font-size: 12.5px; color: var(--ink-3); }
.bar-pair { display: grid; gap: 5px; }
.bar { display: grid; grid-template-columns: 1fr 64px; align-items: center; gap: 10px; }
.bar .track { height: 12px; border-radius: 6px; background: var(--paper-3); overflow: hidden; }
.bar .fill { height: 100%; border-radius: 6px; width: 0; transition: width 1.2s var(--ease); }
.bar.def .fill { background: var(--bad); }
.bar.fix .fill { background: var(--good); }
.bar .v { font: 500 13px/1 var(--mono); text-align: right; color: var(--ink-2); }
.legend { display: flex; gap: 16px; flex-wrap: wrap; font-size: 13.5px; color: var(--ink-2); }
.legend span { display: inline-flex; gap: 7px; align-items: center; }
.legend i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
@media (max-width: 560px) { .bar-row { grid-template-columns: 1fr; } }

/* demo */
.demo { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 22px; align-items: start; }
@media (max-width: 960px) { .demo { grid-template-columns: 1fr; } }
.browser { background: var(--card); border-radius: var(--r-4); box-shadow: var(--frame); overflow: hidden; }
.chrome { display: flex; align-items: center; gap: 12px; padding: 11px 14px; border-bottom: 1px solid var(--line); background: var(--paper); }
.lights { display: flex; gap: 6px; flex: none; }
.lights i { width: 11px; height: 11px; border-radius: 50%; background: var(--paper-3); box-shadow: inset 0 0 0 1px var(--line); }
.url { flex: 1; min-width: 0; font: 400 13px/1 var(--mono); color: var(--ink-2); background: var(--card); border-radius: 999px; padding: 8px 14px; box-shadow: inset 0 0 0 1px var(--line); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fpsbadge { flex: none; font: 500 12px/1 var(--mono); padding: 6px 9px; border-radius: 999px; background: var(--good-bg); color: var(--good); min-width: 74px; text-align: center; transition: background .2s, color .2s; }
.fpsbadge.bad { background: var(--bad-bg); color: var(--bad); }
.viewport { position: relative; display: grid; grid-template-columns: minmax(0, 1fr) 230px; min-height: 340px; }
@media (max-width: 640px) { .viewport { grid-template-columns: 1fr; } }
.viewport canvas.scene { width: 100%; height: 100%; display: block; min-height: 300px; background: #101114; }
.agent { border-left: 1px solid var(--line); padding: 16px; display: grid; align-content: start; gap: 12px; background: var(--card); }
@media (max-width: 640px) { .agent { border-left: 0; border-top: 1px solid var(--line); } }
.agent .label { color: var(--ink-4); }
.agent .status { font-size: 14px; color: var(--black); display: flex; gap: 8px; align-items: center; }
.agent .status i { width: 8px; height: 8px; border-radius: 50%; background: var(--ink-4); flex: none; }
.agent .status.prefill i { background: #E0723F; animation: pulse 1s infinite; }
.agent .status.decode i { background: var(--good); }
@keyframes pulse { 50% { opacity: .35; } }
.agent .prog { height: 6px; border-radius: 3px; background: var(--paper-3); overflow: hidden; }
.agent .prog b { display: block; height: 100%; width: 0; background: #E0723F; }
.agent .out { font-size: 14px; line-height: 1.55; color: var(--ink-2); min-height: 6.5em; }
.agent .out .caret { display: inline-block; width: 7px; height: 1.05em; background: var(--black); vertical-align: -2px; margin-left: 2px; animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.timeline { border-top: 1px solid var(--line); padding: 12px 14px 14px; display: grid; gap: 8px; }
.timeline canvas { width: 100%; height: 120px; display: block; }
.tl-legend { display: flex; flex-wrap: wrap; gap: 14px; font-size: 12.5px; color: var(--ink-3); }
.tl-legend span { display: inline-flex; gap: 6px; align-items: center; }
.tl-legend i { width: 10px; height: 10px; border-radius: 2px; display: inline-block; }
.controls { display: grid; gap: 16px; background: var(--card); border-radius: var(--r-4); box-shadow: var(--shadow-1); padding: 20px; }
.ctl { display: grid; gap: 8px; }
.seg { display: flex; flex-wrap: wrap; gap: 4px; padding: 4px; background: var(--paper-2); border-radius: 12px; }
.seg button {
  flex: 1 1 auto; border: 0; background: transparent; padding: 9px 10px; border-radius: 9px; cursor: pointer;
  font: 500 13.5px/1 var(--sans); color: var(--ink-2); transition: background .25s var(--ease), color .25s;
}
.seg button:hover:not(:disabled) { color: var(--black); }
.seg button[aria-pressed="true"] { background: var(--card); color: var(--black); box-shadow: var(--shadow-1); }
.seg button:disabled { opacity: .35; cursor: not-allowed; }
.readout { display: grid; grid-template-columns: 1fr auto; gap: 7px 12px; font-size: 14px; border-top: 1px solid var(--line); padding-top: 14px; }
.readout dt { color: var(--ink-3); }
.readout dd { margin: 0; font: 500 14px/1.3 var(--mono); text-align: right; color: var(--black); }
.note-pred { font-size: 13.5px; line-height: 1.5; background: var(--warn-bg); color: var(--warn); border-radius: 10px; padding: 10px 12px; }

/* stage 2 */
.phase-list { display: grid; gap: 0; counter-reset: ph; }
.phase { display: grid; grid-template-columns: 90px minmax(0, 1fr); gap: 20px; padding-block: 30px; border-top: 1px solid var(--line); }
.phase:first-child { border-top: 0; padding-top: 0; }
.phase .k { font: 500 13px/1.3 var(--mono); color: var(--accent); letter-spacing: .06em; text-transform: uppercase; padding-top: 6px; }
.phase .body { display: grid; gap: 14px; }
@media (max-width: 640px) { .phase { grid-template-columns: 1fr; gap: 8px; } }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 6px 18px; font-size: 15px; }
.kv dt { font: 500 12px/1.9 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.kv dd { margin: 0; }
@media (max-width: 560px) { .kv { grid-template-columns: 1fr; } .kv dd { margin-bottom: 8px; } }
ul.clean { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
ul.clean li { padding-left: 22px; position: relative; }
ul.clean li::before { content: "→"; position: absolute; left: 0; color: var(--accent); }

/* application */
.letter { display: grid; gap: 22px; font-size: clamp(18px, 1.55vw, 20px); line-height: 1.65; max-width: 64ch; }
.letter p strong { color: var(--black); font-weight: 600; }
.sig { display: grid; gap: 4px; margin-top: 10px; }
.sig b { font: 600 24px/1.2 var(--serif); letter-spacing: -0.02em; }
.copyline { display: inline-flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.copyline .addr { font: 400 15px/1 var(--mono); user-select: all; background: var(--card); padding: 10px 14px; border-radius: 999px; box-shadow: inset 0 0 0 1px var(--line); }
.copyline button { border: 0; background: var(--paper-2); border-radius: 999px; padding: 9px 14px; font: 500 13px/1 var(--sans); cursor: pointer; color: var(--ink-2); }
.copyline button:hover { background: var(--paper-3); color: var(--black); }
.video {
  display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 20px; align-items: center; text-decoration: none;
  background: var(--card); border-radius: var(--r-4); box-shadow: var(--shadow-1); padding: 16px; transition: transform .5s var(--ease), box-shadow .5s var(--ease);
}
.video:hover { transform: translateY(-2px); box-shadow: var(--shadow-2); color: inherit; }
.video .play { aspect-ratio: 16/10; border-radius: 12px; background: var(--black); display: grid; place-items: center; max-width: 100%; }
.video .play::after { content: ""; border-left: 16px solid #fff; border-top: 10px solid transparent; border-bottom: 10px solid transparent; margin-left: 4px; }
@media (max-width: 480px) { .video { grid-template-columns: 1fr; } }

.marquee { overflow: hidden; border-block: 1px solid var(--line); padding-block: 14px; background: var(--card); }
.marquee .track { display: flex; gap: 46px; width: max-content; animation: marq 38s linear infinite; font: 500 13px/1 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-3); }
.marquee .track span b { color: var(--black); font-weight: 500; }
@keyframes marq { to { transform: translateX(-50%); } }

footer { padding-block: 40px 60px; border-top: 1px solid var(--line); color: var(--ink-3); font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; }

/* scroll reveal */
.rv { opacity: 0; transform: translateY(18px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.rv.in { opacity: 1; transform: none; }
.rv.d1 { transition-delay: .08s; } .rv.d2 { transition-delay: .16s; } .rv.d3 { transition-delay: .24s; }
@media (prefers-reduced-motion: reduce) {
  .rv { opacity: 1; transform: none; transition: none; }
  .view, .marquee .track { animation: none; }
  html { scroll-behavior: auto; }
}

/* application: letter + forge */
.app-grid { display: grid; grid-template-columns: minmax(0, 1fr) 340px; gap: clamp(28px, 5vw, 72px); align-items: start; }
.forge-col { position: sticky; top: 96px; display: grid; gap: 16px; }
@media (max-width: 900px) { .app-grid { grid-template-columns: 1fr; } .forge-col { position: static; max-width: 420px; } }
.forge { margin: 0; background: #15161E; border-radius: var(--r-4); box-shadow: var(--frame); overflow: hidden; }
.forge canvas { display: block; width: 100%; height: auto; aspect-ratio: 128 / 104; image-rendering: pixelated; image-rendering: crisp-edges; }
.forge figcaption { display: grid; gap: 4px; padding: 14px 16px 16px; background: var(--card); }
.me { display: flex; align-items: center; gap: 14px; background: var(--card); border-radius: var(--r-3); box-shadow: var(--shadow-1); padding: 12px; }
.me img { width: 64px; height: 64px; border-radius: 12px; image-rendering: pixelated; flex: none; }
.me div { display: grid; gap: 2px; }
.me b { font: 600 18px/1.2 var(--serif); letter-spacing: -0.01em; }