:root {
  --bg: #07090c;
  --bg-2: #0c1016;
  --surface: #121820;
  --surface-2: #18212c;
  --line: #273241;
  --line-2: #354557;
  --ink: #edf2f7;
  --muted: #8b97a6;
  --faint: #5d6b7a;
  --mint: #3ee0b0;
  --mint-2: #1bb889;
  --mint-dim: rgba(62, 224, 176, 0.14);
  --amber: #f0b429;
  --amber-dim: rgba(240, 180, 41, 0.14);
  --coral: #ff6b6b;
  --coral-dim: rgba(255, 107, 107, 0.14);
  --blue: #7aa2ff;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.42);
  --radius: 18px;
  --font: "Sora", "Segoe UI", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--bg); color: var(--ink); font-family: var(--font); }
html { color-scheme: dark; }
body {
  min-height: 100dvh;
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(62, 224, 176, 0.08), transparent 50%),
    radial-gradient(900px 500px at -10% 110%, rgba(122, 162, 255, 0.06), transparent 45%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
}
button, input, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--mint); }
img { max-width: 100%; display: block; }
[hidden] { display: none !important; }

.app {
  width: min(1180px, calc(100% - 28px));
  margin: 0 auto;
  padding: 18px 0 72px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 0 22px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.logo {
  width: 38px; height: 38px; border-radius: 11px;
  background: #0b1016;
  border: 1px solid var(--line);
  display: grid; place-items: center;
  box-shadow: inset 0 0 0 1px rgba(62, 224, 176, 0.08);
}
.logo svg { width: 22px; height: 22px; }
.brand-name { font-weight: 650; letter-spacing: -0.03em; font-size: 1.05rem; }
.brand-name span { color: var(--mint); }
.brand-sub { color: var(--muted); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; }

.nav { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.ghost, .solid, .danger, .amber {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
  border-radius: 12px;
  padding: 10px 14px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: 0.15s ease;
}
.ghost:hover, .solid:hover, .danger:hover { transform: translateY(-1px); border-color: var(--line-2); }
.solid {
  background: var(--mint);
  color: #06281d;
  border-color: transparent;
  box-shadow: 0 8px 24px rgba(62, 224, 176, 0.18);
}
.solid:disabled, .ghost:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.danger { background: var(--coral-dim); border-color: #5a2a2a; color: #ffd4d4; }
.amber { background: var(--amber-dim); border-color: #6b5314; color: #ffe7a3; }
.linkish {
  background: none; border: 0; color: var(--muted); padding: 8px;
  text-decoration: underline; text-underline-offset: 3px; font-size: 0.86rem;
}

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 28px;
  align-items: center;
  padding: 12px 0 8px;
}
.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  color: var(--mint); font-size: 0.78rem; letter-spacing: 0.12em; text-transform: uppercase; font-weight: 650;
}
.pulse {
  width: 8px; height: 8px; border-radius: 50%; background: var(--mint);
  box-shadow: 0 0 0 0 rgba(62, 224, 176, 0.7);
  animation: pulse 1.8s infinite;
}
@keyframes pulse {
  70% { box-shadow: 0 0 0 10px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
h1 {
  font-size: clamp(2rem, 4.4vw, 3.35rem);
  line-height: 1.05;
  letter-spacing: -0.045em;
  margin: 10px 0 12px;
}
h1 em { font-style: normal; color: var(--mint); }
.lede { color: var(--muted); font-size: 1.05rem; line-height: 1.6; max-width: 54ch; }

.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin: 28px 0 22px;
}
.step {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 16px 18px;
  min-height: 132px;
  position: relative;
  overflow: hidden;
}
.step::after {
  content: "";
  position: absolute; inset: auto -20% -40% 40%;
  height: 90px;
  background: radial-gradient(circle, var(--mint-dim), transparent 70%);
  pointer-events: none;
}
.step-num {
  width: 28px; height: 28px; border-radius: 8px;
  background: var(--mint-dim); color: var(--mint);
  display: grid; place-items: center; font-weight: 700; font-size: 0.84rem;
  margin-bottom: 12px;
}
.step h3 { margin: 0 0 6px; font-size: 1rem; letter-spacing: -0.02em; }
.step p { margin: 0; color: var(--muted); font-size: 0.88rem; line-height: 1.45; }

.cta-row { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.fine { color: var(--faint); font-size: 0.78rem; margin-top: 10px; }

.preview-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 12px;
  box-shadow: var(--shadow);
  position: relative;
}
.preview-card .chrome {
  display: flex; gap: 6px; padding: 4px 6px 10px;
}
.preview-card .chrome i { width: 9px; height: 9px; border-radius: 50%; background: #2a3544; display: block; }
.preview-card .chrome i:first-child { background: #ff6b6b; }
.mock {
  border-radius: 14px; overflow: hidden; background: #0e1420;
  border: 1px solid var(--line);
  min-height: 280px;
  position: relative;
}
.mock svg { width: 100%; height: auto; display: block; }
.float-tip {
  position: absolute; right: 14px; bottom: 14px;
  width: min(230px, 70%);
  background: #111820;
  border: 1px solid var(--line-2);
  border-radius: 14px;
  padding: 12px;
  box-shadow: var(--shadow);
}
.float-tip strong { display: block; font-size: 0.82rem; margin-bottom: 4px; }
.float-tip span { color: var(--muted); font-size: 0.75rem; line-height: 1.4; display: block; }

.scanner {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(300px, 0.8fr);
  gap: 18px;
}
.stage {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 22px;
  overflow: hidden;
  min-height: 420px;
  position: relative;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.stage-bar {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px; border-bottom: 1px solid var(--line); gap: 8px;
}
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 0.75rem; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: 5px 10px;
}
.pill.on { color: var(--mint); border-color: #1d4d3e; background: var(--mint-dim); }
.pill.warn { color: var(--amber); border-color: #5c4814; background: var(--amber-dim); }
.frame-wrap {
  position: relative;
  background: #080c12;
  min-height: 320px;
  display: grid;
  place-items: center;
}
#liveVideo, #stillImage, #frameCanvas {
  max-width: 100%; max-height: 58vh; width: 100%; height: auto;
  object-fit: contain; background: #080c12;
}
#arrowLayer {
  position: absolute; inset: 0; width: 100%; height: 100%;
  pointer-events: none;
}
.stage-actions {
  display: flex; flex-wrap: wrap; gap: 8px;
  padding: 12px; border-top: 1px solid var(--line);
  background: var(--surface-2);
}
.ask-box { display: flex; gap: 8px; flex: 1; min-width: 200px; }
.ask-box input {
  flex: 1; background: #0d131b; border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px; outline: none;
}
.ask-box input:focus { border-color: var(--mint-2); }

.side { display: flex; flex-direction: column; gap: 12px; }
.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
}
.card h2 { margin: 0 0 8px; font-size: 1.05rem; letter-spacing: -0.02em; }
.meta {
  display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 12px;
}
.tag {
  font-size: 0.72rem; color: var(--muted);
  border: 1px solid var(--line); border-radius: 999px; padding: 3px 8px;
}
.tag.hit { color: var(--mint); border-color: #1d4d3e; }
.expl { color: var(--ink); line-height: 1.55; font-size: 0.95rem; margin: 0 0 12px; }
.steps-ol { margin: 0; padding: 0; list-style: none; display: grid; gap: 8px; }
.steps-ol li {
  display: grid; grid-template-columns: 26px 1fr; gap: 10px; align-items: start;
  padding: 10px; border-radius: 12px; border: 1px solid transparent;
}
.steps-ol li.current {
  background: var(--mint-dim); border-color: #1d4d3e;
}
.steps-ol .n {
  width: 26px; height: 26px; border-radius: 8px;
  background: #0d141c; border: 1px solid var(--line);
  display: grid; place-items: center; font-size: 0.75rem; font-weight: 700;
}
.steps-ol li.current .n { background: var(--mint); color: #06281d; border-color: transparent; }
.steps-ol p { margin: 0; color: var(--muted); font-size: 0.9rem; line-height: 1.45; }
.steps-ol li.current p { color: var(--ink); }
.card-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.empty {
  color: var(--muted); font-size: 0.92rem; line-height: 1.55;
}
.ocr-box {
  font-family: var(--mono); font-size: 0.72rem; color: var(--faint);
  max-height: 90px; overflow: auto; white-space: pre-wrap;
  background: #0b1016; border-radius: 10px; padding: 8px; border: 1px solid var(--line);
}

.samples { display: grid; gap: 8px; }
.sample {
  text-align: left; width: 100%;
  background: var(--surface-2); border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px;
}
.sample:hover { border-color: var(--mint-2); }
.sample b { display: block; font-size: 0.86rem; margin-bottom: 2px; }
.sample span { color: var(--muted); font-size: 0.76rem; }

.drawer-back {
  position: fixed; inset: 0; background: rgba(4, 6, 9, 0.62);
  backdrop-filter: blur(6px);
  display: grid; place-items: end center;
  z-index: 30;
}
.drawer {
  width: min(720px, 100%);
  max-height: min(86dvh, 820px);
  overflow: auto;
  background: #10161e;
  border: 1px solid var(--line);
  border-radius: 20px 20px 0 0;
  padding: 20px 20px 28px;
  box-shadow: var(--shadow);
}
.drawer header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.hist-item {
  border: 1px solid var(--line); border-radius: 14px; padding: 12px; margin-bottom: 10px;
  background: var(--surface);
}
.hist-item time { color: var(--faint); font-size: 0.74rem; }
.toast {
  position: fixed; left: 50%; bottom: 18px; transform: translateX(-50%);
  background: #121b25; border: 1px solid var(--line-2); color: var(--ink);
  padding: 10px 14px; border-radius: 12px; z-index: 50; font-size: 0.88rem;
  box-shadow: var(--shadow);
}

.offline-banner {
  background: var(--amber-dim); color: #ffe7a3; border: 1px solid #6b5314;
  border-radius: 12px; padding: 10px 12px; margin-bottom: 14px; font-size: 0.88rem;
}

.share-label {
  display: block; font-size: 0.76rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--faint); margin: 8px 0 6px;
}
.share-copy-row { display: flex; gap: 8px; }
.share-copy-row input {
  flex: 1; background: #0d131b; border: 1px solid var(--line);
  border-radius: 12px; padding: 10px 12px; color: var(--ink);
}
.share-grid { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0; }
.socials { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.socials a {
  text-decoration: none; color: var(--ink);
  border: 1px solid var(--line); background: var(--surface-2);
  border-radius: 999px; padding: 7px 12px; font-size: 0.82rem; font-weight: 600;
}
.socials a:hover { border-color: var(--mint-2); color: var(--mint); }
.qr-wrap {
  display: grid; grid-template-columns: 168px 1fr; gap: 16px; align-items: center;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 16px; padding: 14px;
}
.qr-wrap img { border-radius: 12px; width: 168px; height: 168px; }
.qr-wrap h3 { margin: 0 0 6px; font-size: 1rem; }
.hist-item header { display: block; margin: 0; }
.hist-item .mini-share {
  margin-top: 8px;
}

@media (max-width: 860px) {
  .qr-wrap { grid-template-columns: 1fr; justify-items: start; }
}

@media (max-width: 860px) {
  .hero, .scanner, .steps { grid-template-columns: 1fr; }
  .preview-card { display: none; }
  .app { width: min(100% - 18px, 1180px); }
  .stage { min-height: 300px; }
}