:root {
  --paper: #f6f2ea;
  --card: #fffdf8;
  --ink: #1b1915;
  --muted: #6f685c;
  --line: #e2dbcd;
  --accent: #e5482b;
  --accent-soft: #fbe3dc;
  --ok: #1f8a5b;
  --ok-soft: #dcf1e6;
  --warn: #b7791f;
  --warn-soft: #f8ecd6;
  --shadow: 0 1px 0 rgba(27, 25, 21, .04), 0 8px 24px -12px rgba(27, 25, 21, .18);
}
:root:not([data-theme="light"]) { color-scheme: light; }

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.5 Inter, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}
button { font: inherit; cursor: pointer; }

.top {
  display: flex; justify-content: space-between; align-items: center;
  padding: 18px 32px; border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -.01em; }
.mark {
  width: 22px; height: 22px; background: var(--ink);
  clip-path: polygon(0 100%, 50% 0, 100% 100%, 50% 72%);
}
.models { display: flex; gap: 6px; }
.chip {
  font: 500 11px/1 "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .04em;
  padding: 6px 8px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); background: var(--card);
}

main { max-width: 1180px; margin: 0 auto; padding: 0 32px 96px; }

.hero { padding: 56px 0 36px; max-width: 760px; }
.hero h1 {
  font: 400 64px/1 "Instrument Serif", serif; letter-spacing: -.02em; margin: 0 0 18px;
}
.hero h1 em { color: var(--accent); }
.hero p { font-size: 17px; color: var(--muted); margin: 0; max-width: 600px; }

.sample { margin-top: 22px; }
.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 0 0 28px; }
.how-card { border-top: 1.5px solid var(--ink); padding-top: 12px; }
.how-n { font: 500 11px "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .05em; color: var(--accent); }
.how-card p { margin: 6px 0 0; font-size: 14px; color: var(--muted); }
.how-card strong { color: var(--ink); font-weight: 600; }
.foot { max-width: 1180px; margin: 0 auto; padding: 24px 32px 40px; color: var(--muted); font-size: 12px; border-top: 1px solid var(--line); }

details.seen { margin-top: 18px; background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 12px 16px; }
details.seen summary { cursor: pointer; font-weight: 600; }
details.seen summary span { font-weight: 400; color: var(--muted); font-size: 13px; }
.seen ol { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-direction: column; gap: 8px; }
.seen li { display: grid; grid-template-columns: 90px 1fr; gap: 10px; font-size: 13.5px; }
.seen li button { font: 500 12px "JetBrains Mono", monospace; color: var(--muted); background: none; border: 0; padding: 0; text-align: left; text-decoration: underline dotted; }
.seen li em { display: block; color: var(--muted); font-style: normal; }
.seen .final { margin: 12px 0 0; font-size: 13.5px; }

.stage { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.panel {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px; padding: 18px;
  box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 14px;
}
.panel-head { display: flex; gap: 12px; align-items: center; }
.panel-head h2 { margin: 0; font-size: 16px; }
.panel-head p { margin: 0; color: var(--muted); font-size: 13px; }
.step-no {
  width: 28px; height: 28px; border-radius: 50%; display: grid; place-items: center;
  background: var(--ink); color: var(--paper); font: 500 13px "JetBrains Mono", monospace;
}

.media { position: relative; border-radius: 12px; overflow: hidden; background: #ece6da; aspect-ratio: 16 / 10; }
.media video { width: 100%; height: 100%; object-fit: contain; background: #111; display: block; }
.picker { position: absolute; inset: 0; display: flex; flex-direction: column; gap: 10px; padding: 14px; }
.drop {
  flex: 1; border: 1.5px dashed #c9bfac; border-radius: 10px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 4px; cursor: pointer; transition: background .15s, border-color .15s;
}
.drop:hover, .drop.over { background: #f3ede1; border-color: var(--ink); }
.drop-icon { font-size: 22px; }
.drop-title { font-weight: 600; }
.drop-sub { color: var(--muted); font-size: 13px; }

.ghost {
  border: 1px solid var(--line); background: var(--card); border-radius: 10px; padding: 9px 12px; color: var(--ink);
}
.ghost:hover { border-color: var(--ink); }
.primary {
  border: 0; background: var(--ink); color: var(--paper); border-radius: 10px; padding: 13px 16px; font-weight: 600;
  transition: transform .1s, opacity .15s;
}
.primary:disabled { opacity: .35; cursor: not-allowed; }
.primary:not(:disabled):hover { transform: translateY(-1px); }

.rec-bar {
  position: absolute; left: 12px; right: 12px; bottom: 12px; display: flex; justify-content: space-between; align-items: center;
}
.rec-dot { color: #fff; font: 500 12px "JetBrains Mono", monospace; display: flex; align-items: center; gap: 6px; text-shadow: 0 1px 2px #000; }
.rec-dot::before { content: ""; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); animation: pulse 1s infinite; }

.status { min-height: 20px; font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 8px; }
.status.busy::before {
  content: ""; width: 12px; height: 12px; border-radius: 50%; border: 2px solid var(--line); border-top-color: var(--ink);
  animation: spin .8s linear infinite;
}
.status.error { color: var(--accent); }

.section-head { display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap; margin: 48px 0 16px; }
.section-head h2 { font: 400 36px/1.1 "Instrument Serif", serif; margin: 0; }
.sub { color: var(--muted); font-size: 13px; }

.steps { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; }
.step {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow);
  animation: rise .35s ease both;
}
.step-body { padding: 12px 14px 14px; }
.step-title { font-weight: 600; display: flex; gap: 8px; align-items: baseline; }
.step-title .n { font: 500 12px "JetBrains Mono", monospace; color: var(--muted); }
.step p { margin: 6px 0 0; font-size: 13.5px; }
.step .obj { margin-top: 8px; font: 500 11px "JetBrains Mono", monospace; color: var(--ok); text-transform: uppercase; letter-spacing: .04em; }

.frame { position: relative; background: #111; line-height: 0; }
.frame img { width: 100%; display: block; }
.frame svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.frame .loading {
  position: absolute; left: 10px; bottom: 10px; line-height: 1; font: 500 11px "JetBrains Mono", monospace; color: #fff;
  background: rgba(0,0,0,.55); padding: 5px 7px; border-radius: 6px;
}
.frame .tag {
  position: absolute; left: 10px; top: 10px; line-height: 1; font: 600 11px Inter, sans-serif; letter-spacing: .03em; text-transform: uppercase;
  color: #fff; padding: 5px 8px; border-radius: 6px;
}
.mask-ok path { fill: rgba(31, 138, 91, .35); stroke: #3fe39b; }
.mask-bad path { fill: rgba(229, 72, 43, .38); stroke: #ff6a4d; animation: glow 1.4s ease-in-out infinite; }
.mask-ok path, .mask-bad path { stroke-width: 3; vector-effect: non-scaling-stroke; }
.frame-placeholder { aspect-ratio: 16/10; background: #1d1b18; }

.verdict {
  margin: 48px 0 18px; padding: 22px 24px; border-radius: 16px; display: flex; gap: 18px; align-items: center;
  animation: rise .35s ease both;
}
.verdict.fail { background: var(--accent-soft); }
.verdict.pass { background: var(--ok-soft); }
.verdict .big { font: 400 44px/1 "Instrument Serif", serif; }
.verdict.fail .big { color: var(--accent); }
.verdict.pass .big { color: var(--ok); }
.verdict p { margin: 4px 0 0; font-size: 16px; }

.results { display: flex; flex-direction: column; gap: 12px; }
.result {
  background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 14px 16px; box-shadow: var(--shadow);
  animation: rise .35s ease both;
}
.result-head { display: flex; align-items: center; gap: 10px; }
.result-head .title { font-weight: 600; flex: 1; }
.result-head .time { font: 500 12px "JetBrains Mono", monospace; color: var(--muted); background: none; border: 0; padding: 0; text-decoration: underline dotted; }
.badge { font: 600 11px Inter, sans-serif; text-transform: uppercase; letter-spacing: .04em; padding: 4px 8px; border-radius: 999px; }
.badge.ok { background: var(--ok-soft); color: var(--ok); }
.badge.wrong, .badge.missed { background: var(--accent-soft); color: var(--accent); }
.badge.unclear { background: var(--warn-soft); color: var(--warn); }
.result .observed { margin: 6px 0 0; color: var(--muted); font-size: 14px; }
.result .fix { margin: 10px 0 0; font-size: 15px; font-weight: 500; }
.result .fix::before { content: "Fix → "; color: var(--accent); font-weight: 600; }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 14px; }
.compare .frame { border-radius: 10px; overflow: hidden; }

.live-grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 16px; }
.live-cam {
  position: relative; border-radius: 16px; overflow: hidden; background: #111; aspect-ratio: 16 / 10; box-shadow: var(--shadow);
}
.live-cam video, .live-cam svg { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.live-flash { position: absolute; inset: 0; pointer-events: none; box-shadow: inset 0 0 0 0 transparent; transition: box-shadow .25s; }
.live-flash.ok { box-shadow: inset 0 0 0 8px #3fe39b; }
.live-flash.bad { box-shadow: inset 0 0 0 8px #ff6a4d; }
.live-state {
  position: absolute; top: 14px; left: 14px; font: 600 11px Inter, sans-serif; text-transform: uppercase; letter-spacing: .05em;
  padding: 6px 10px; border-radius: 999px; background: rgba(0,0,0,.6); color: #fff;
}
.live-state[data-s="done"] { background: var(--ok); }
.live-state[data-s="mistake"] { background: var(--accent); }
.live-state[data-s="checking"] { background: var(--warn); }
.live-state[data-s="working"]::before { content: "● "; animation: pulse 1s infinite; }
.live-caption {
  position: absolute; left: 50%; bottom: 18px; transform: translateX(-50%); max-width: calc(100% - 40px);
  background: rgba(15, 14, 12, .82); color: #fff; padding: 12px 18px; border-radius: 12px;
  font: 400 26px/1.2 "Instrument Serif", serif; text-align: center; backdrop-filter: blur(6px);
}
.live-start { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); padding: 16px 22px; font-size: 16px; background: var(--accent); }
.live-start:not(:disabled):hover { transform: translate(-50%, -52%); }
.live-side { display: flex; flex-direction: column; gap: 14px; }
.target { background: var(--card); border: 1px solid var(--line); border-radius: 14px; overflow: hidden; box-shadow: var(--shadow); }
.target-label { padding: 10px 12px; font: 500 11px "JetBrains Mono", monospace; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.live-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 6px; }
.live-steps li {
  display: flex; gap: 10px; align-items: center; padding: 9px 12px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); font-size: 14px; color: var(--muted); transition: all .25s;
}
.live-steps li .dot {
  width: 20px; height: 20px; flex: none; border-radius: 50%; border: 1.5px solid var(--line); display: grid; place-items: center;
  font: 500 11px "JetBrains Mono", monospace;
}
.live-steps li.now { color: var(--ink); border-color: var(--ink); font-weight: 600; }
.live-steps li.now .dot { border-color: var(--ink); }
.live-steps li.done { color: var(--ok); }
.live-steps li.done .dot { background: var(--ok); border-color: var(--ok); color: #fff; }
.live-steps li.bad { border-color: var(--accent); }
.live-tools { display: flex; align-items: center; gap: 10px; font-size: 13px; color: var(--muted); }
.toggle { display: flex; align-items: center; gap: 6px; cursor: pointer; }
.latency { margin-left: auto; font: 500 11px "JetBrains Mono", monospace; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .3; } }
@keyframes glow { 50% { fill: rgba(229, 72, 43, .12); } }
@keyframes rise { from { opacity: 0; transform: translateY(8px); } }

@media (max-width: 760px) {
  .top { padding: 14px 16px; }
  main { padding: 0 16px 64px; }
  .hero h1 { font-size: 42px; }
  .stage, .compare, .live-grid, .how { grid-template-columns: 1fr; }
  .foot { padding: 20px 16px 32px; }
  .live-caption { font-size: 19px; }
  .models { display: none; }
}