:root {
  --bg: #0d1117;
  --panel: #161b22;
  --panel-2: #1c232d;
  --border: #2a313c;
  --text: #e6edf3;
  --muted: #9aa7b4;
  --accent: #5b8cff;
  --accent-2: #7c5cff;
  --good: #3fb950;
  --warn: #d29922;
  --bad: #f85149;
  --radius: 14px;
  --maxw: 940px;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #18223b 0%, var(--bg) 55%);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

header.site {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; backdrop-filter: blur(8px);
  background: rgba(13, 17, 23, 0.72); z-index: 10;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand .mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: grid; place-items: center; font-size: 14px; font-weight: 800; color: white;
}
nav.site a { color: var(--muted); margin-left: 18px; font-size: 14px; }
nav.site a:hover, nav.site a.active { color: var(--text); }
.badge {
  font-size: 12px; padding: 3px 9px; border-radius: 999px;
  border: 1px solid var(--border); color: var(--muted); margin-left: 18px;
}
.badge.pro { color: var(--good); border-color: rgba(63,185,80,.4); }

.hero { text-align: center; padding: 54px 0 26px; }
.hero h1 { font-size: 40px; line-height: 1.15; margin: 0 0 12px; letter-spacing: -0.5px; }
.hero h1 .grad { background: linear-gradient(90deg, var(--accent), var(--accent-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--muted); font-size: 18px; max-width: 620px; margin: 0 auto; }

.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.tool { margin: 18px 0 40px; }

.seg { display: inline-flex; background: var(--panel-2); border: 1px solid var(--border); border-radius: 10px; padding: 4px; gap: 4px; }
.seg button { background: transparent; color: var(--muted); border: 0; padding: 7px 16px; border-radius: 7px; cursor: pointer; font-size: 14px; font-weight: 600; }
.seg button.active { background: var(--accent); color: white; }
.seg.modality button.active { background: var(--accent-2); }
.row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.row + .row { margin-top: 14px; }

textarea {
  width: 100%; min-height: 200px; resize: vertical; margin-top: 14px;
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px; font: 15px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace;
}
textarea:focus { outline: none; border-color: var(--accent); }

.controls { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin-top: 12px; }
.controls label { font-size: 14px; color: var(--muted); display: inline-flex; align-items: center; gap: 7px; }
button.primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: white;
  border: 0; padding: 11px 22px; border-radius: 10px; font-size: 15px; font-weight: 700; cursor: pointer;
}
button.primary:disabled { opacity: .5; cursor: not-allowed; }
button.ghost { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); padding: 9px 16px; border-radius: 9px; cursor: pointer; font-size: 14px; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.result { margin-top: 16px; }
.hidden { display: none !important; }
.notice { border: 1px solid var(--border); background: var(--panel-2); border-radius: 10px; padding: 12px 14px; font-size: 14px; }
.notice.warn { border-color: rgba(210,153,34,.4); }
.notice.upgrade { border-color: rgba(124,92,255,.5); background: linear-gradient(180deg, rgba(124,92,255,.12), transparent); }

pre.out { white-space: pre-wrap; word-break: break-word; background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px; font: 15px/1.65 ui-monospace, monospace; max-height: 320px; overflow: auto; }

/* detection gauge */
.gauge { display: flex; align-items: center; gap: 18px; }
.gauge .dial { --p: 0; width: 96px; height: 96px; border-radius: 50%; flex: 0 0 auto;
  background: conic-gradient(var(--g) calc(var(--p) * 1%), var(--panel-2) 0); display: grid; place-items: center; }
.gauge .dial > div { width: 74px; height: 74px; border-radius: 50%; background: var(--panel); display: grid; place-items: center; font-weight: 800; font-size: 22px; }
.gauge .verdict { font-size: 18px; font-weight: 700; }
.signals { margin-top: 14px; display: grid; gap: 8px; }
.sig { display: grid; grid-template-columns: 160px 1fr 44px; gap: 10px; align-items: center; font-size: 13px; }
.sig .bar { height: 8px; background: var(--panel-2); border-radius: 999px; overflow: hidden; }
.sig .bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.sig .name { color: var(--muted); }

.tag { font-size: 11px; padding: 2px 7px; border-radius: 6px; border: 1px solid var(--border); color: var(--muted); margin-left: 8px; }

.pricing { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin: 26px 0 40px; }
.plan { padding: 24px; }
.plan h3 { margin: 0 0 4px; font-size: 18px; }
.plan .price { font-size: 38px; font-weight: 800; margin: 8px 0; }
.plan .price span { font-size: 15px; color: var(--muted); font-weight: 500; }
.plan ul { list-style: none; padding: 0; margin: 14px 0; }
.plan li { padding: 6px 0; color: var(--muted); }
.plan li::before { content: "✓"; color: var(--good); margin-right: 8px; }
.plan.featured { border-color: var(--accent-2); box-shadow: 0 0 0 1px rgba(124,92,255,.3); }

/* account */
.acct-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 18px; align-items: start; margin: 8px 0 40px; }
.acct-grid .span { grid-column: 1 / -1; }
.card h2 { margin: 0 0 4px; font-size: 17px; }
.card .card-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 12px; }
.field { display: grid; grid-template-columns: 120px 1fr; gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--border); }
.field:last-child { border-bottom: 0; }
.field .k { color: var(--muted); font-size: 13px; align-self: center; }
.field .v { font-size: 15px; word-break: break-word; }
.field .v code { font: 13px/1.5 ui-monospace, monospace; color: var(--muted); }
.acct-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }
button.danger, a.danger { background: transparent; color: var(--bad); border: 1px solid rgba(248,81,73,.5); padding: 9px 16px; border-radius: 9px; cursor: pointer; font-size: 14px; text-decoration: none; }
button.danger:hover, a.danger:hover { background: rgba(248,81,73,.12); color: #fff; }
.quota-row { display: flex; align-items: center; justify-content: space-between; padding: 8px 0; font-size: 14px; }
.quota-row .bar { flex: 1; height: 8px; margin: 0 12px; background: var(--panel-2); border-radius: 999px; overflow: hidden; }
.quota-row .bar > span { display: block; height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.quota-row .n { color: var(--muted); font-size: 13px; min-width: 92px; text-align: right; }
.acct-note { color: var(--muted); font-size: 13px; margin-top: 14px; line-height: 1.6; }

footer.site { border-top: 1px solid var(--border); padding: 26px 0; color: var(--muted); font-size: 14px; margin-top: 40px; }
footer.site .row { align-items: flex-start; }

.modal-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,.6); display: grid; place-items: center; z-index: 50; }
.modal { width: 360px; max-width: calc(100vw - 32px); }
.modal input { width: 100%; padding: 11px 13px; margin: 7px 0; background: var(--bg); border: 1px solid var(--border); border-radius: 9px; color: var(--text); font-size: 15px; }
.modal h3 { margin-top: 0; }
.err { color: var(--bad); font-size: 13px; min-height: 18px; }
.ok { color: var(--good); font-size: 13px; min-height: 18px; }

@media (max-width: 680px) {
  .pricing { grid-template-columns: 1fr; }
  .sig { grid-template-columns: 120px 1fr 40px; }
  .hero h1 { font-size: 32px; }
}