/* ChainWatch landing — formal monochrome. Black on white, hairline borders,
   single black accent for primary actions. Severity colors only where meaning demands it. */
:root {
  --bg: #ffffff;
  --bg2: #fafafa;
  --panel: #ffffff;
  --inset: #f7f7f7;
  --border: #e2e2e2;
  --border-soft: #efefef;
  --text: #0a0a0a;
  --muted: #525252;
  --faint: #a3a3a3;
  --accent: #0a0a0a;
  --accent-ink: #ffffff;
  --accent-dim: rgba(10,10,10,.05);
  --green: #15803d; --yellow: #b45309; --red: #dc2626; --orange: #c2410c;
  --radius: 14px;
  --display: "Space Grotesk", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--font);
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  font-size: 16px; line-height: 1.6; }
::selection { background: rgba(10,10,10,.12); }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
section { padding: 88px 0; }
h1, h2, h3 { font-family: var(--display); letter-spacing: -0.03em; line-height: 1.12; margin: 0 0 14px; font-weight: 650; }
h1 { font-size: clamp(38px, 5.4vw, 62px); }
h2 { font-size: clamp(27px, 3.6vw, 40px); }
.kicker { font-family: var(--mono); font-size: 12.5px; color: var(--accent); letter-spacing: .06em;
  margin: 0 0 14px; display: flex; align-items: center; gap: 9px; }
.kicker::before { content: ""; width: 22px; height: 1px; background: var(--accent); display: inline-block; }
.lede { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 0 30px; }
.center { text-align: center; }
.center .lede { margin-left: auto; margin-right: auto; }
.center .kicker { justify-content: center; }

/* ---------- nav ---------- */
.nav { position: sticky; top: 0; z-index: 50; display: flex; align-items: center; gap: 30px;
  padding: 13px 28px; background: rgba(255,255,255,.86); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft); }
.logo { display: flex; align-items: center; gap: 9px; font-family: var(--display); font-weight: 700;
  font-size: 16.5px; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.logo img { border-radius: 7px; display: block; filter: grayscale(1); }
.nav-links { display: flex; gap: 24px; margin-left: auto; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; gap: 10px; align-items: center; }
@media (max-width: 820px) { .nav-links { display: none; } .nav { gap: 16px; padding: 12px 18px; } }

/* ---------- buttons ---------- */
.btn { display: inline-block; padding: 13px 24px; border-radius: 9px; font-weight: 600; font-size: 15px;
  text-decoration: none; border: 1px solid transparent; cursor: pointer; font-family: var(--font);
  transition: background .12s, border-color .12s, transform .08s; white-space: nowrap; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #262626; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--faint); background: rgba(10,10,10,.06); }
.btn-sm { padding: 9px 17px; font-size: 13.5px; }

/* ---------- hero ---------- */
.hero { position: relative; padding: 96px 0 70px; overflow: hidden; }
.radar { position: absolute; top: -140px; right: -120px; width: 560px; height: 560px;
  pointer-events: none; opacity: .5; }
.radar .ring { position: absolute; inset: 0; border: 1px solid rgba(10,10,10,.14); border-radius: 50%; }
.radar .ring:nth-child(2) { inset: 90px; }
.radar .ring:nth-child(3) { inset: 180px; }
.radar .ring:nth-child(4) { inset: 270px; }
.radar .sweep { position: absolute; inset: 0; border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(10,10,10,.10), transparent 22%);
  animation: sweep 7s linear infinite; }
@keyframes sweep { to { transform: rotate(360deg); } }
.hero-inner { position: relative; max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.live-line { display: inline-flex; align-items: center; gap: 9px; font-family: var(--mono); font-size: 12.5px;
  color: var(--muted); border: 1px solid var(--border-soft); border-radius: 20px; padding: 6px 14px; margin-bottom: 26px;
  background: #ffffff; }
.live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); animation: pulse 2.2s infinite; }
@keyframes pulse { 50% { opacity: .5; } }
.hero h1 { max-width: 760px; }
.hero h1 .accent-word { color: var(--accent); }
.hero .lede { font-size: 19px; max-width: 660px; }
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 6px 0 64px; }

/* product shot */
.shot-frame { border: 1px solid var(--border); border-radius: 14px; overflow: hidden;
  background: var(--panel); box-shadow: 0 24px 60px rgba(0,0,0,.10); }
.shot-bar { display: flex; align-items: center; gap: 14px; padding: 11px 16px;
  border-bottom: 1px solid var(--border-soft); background: var(--bg2); }
.traffic { display: flex; gap: 7px; }
.traffic span { width: 11px; height: 11px; border-radius: 50%; background: #d4d4d4; }



.shot-url { font-family: var(--mono); font-size: 12.5px; color: var(--faint); background: var(--inset);
  border: 1px solid var(--border-soft); border-radius: 7px; padding: 5px 14px; flex: 1; text-align: center; }
.shot-frame img { display: block; width: 100%; height: auto; }
.shot-cap { text-align: center; color: var(--faint); font-size: 13.5px; margin-top: 16px; }
.shot-cap b { color: var(--muted); font-weight: 600; }

/* spec strip */
.specs { border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); background: var(--bg2); }
.specs .wrap { display: flex; flex-wrap: wrap; }
.spec { flex: 1 1 200px; padding: 20px 24px 20px 0; }
.spec + .spec { border-left: 1px solid var(--border-soft); padding-left: 24px; }
.spec b { display: block; font-family: var(--mono); font-size: 19px; font-weight: 600; color: var(--text);
  font-variant-numeric: tabular-nums; }
.spec span { font-size: 13px; color: var(--faint); }

/* ---------- scan demo ---------- */
.scan-card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px; margin: 34px 0 18px; }
.scan-row { display: flex; gap: 10px; }
.scan-row input { flex: 1; background: var(--inset); border: 1px solid var(--border); color: var(--text);
  border-radius: 9px; padding: 13px 15px; font-size: 14.5px; font-family: var(--mono); min-width: 0; }
.scan-row input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(10,10,10,.12); }
.scan-row select { background: var(--inset); border: 1px solid var(--border); color: var(--text);
  border-radius: 9px; padding: 0 12px; font-size: 14px; font-family: var(--font); }
.scan-note { color: var(--faint); font-size: 13px; margin: 12px 0 0; }
@media (max-width: 640px) { .scan-row { flex-direction: column; } }
#scan-result .scanning { text-align: center; color: var(--muted); padding: 30px; font-size: 14.5px; }
.spinner { width: 24px; height: 24px; border: 3px solid var(--border); border-top-color: var(--accent);
  border-radius: 50%; margin: 0 auto 12px; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.scan-report { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.scan-report h3 { margin: 0 0 4px; font-size: 17px; }
.scan-meta { color: var(--muted); font-size: 12.5px; margin-bottom: 16px; font-family: var(--mono); }
.scan-alert { border: 1px solid var(--border-soft); border-left: 3px solid var(--faint); border-radius: 9px;
  padding: 11px 14px; margin-bottom: 9px; background: rgba(10,10,10,.03); }
.scan-alert.critical { border-left-color: var(--red); }
.scan-alert.high { border-left-color: var(--orange); }
.scan-alert.medium { border-left-color: var(--yellow); }
.scan-alert .t { font-weight: 600; font-size: 14.5px; }
.scan-alert .s { color: var(--faint); font-size: 12px; font-family: var(--mono); margin-top: 3px; word-break: break-all; }
.all-clear { text-align: center; padding: 24px; color: var(--green); font-weight: 600; font-size: 16px; }
.scan-cta { margin-top: 16px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.scan-cta p { color: var(--muted); font-size: 13.5px; margin: 0; }
.scan-error { background: rgba(220,38,38,.07); border: 1px solid rgba(220,38,38,.3); color: var(--red);
  border-radius: 9px; padding: 13px 17px; font-size: 14px; }

/* ---------- detection table ---------- */
.detect-table { margin-top: 36px; border: 1px solid var(--border-soft); border-radius: var(--radius); overflow: hidden; }
.detect-row { display: grid; grid-template-columns: 190px 110px 1fr; gap: 18px; padding: 17px 22px;
  border-bottom: 1px solid var(--border-soft); align-items: baseline; background: var(--panel); }
.detect-row:last-child { border-bottom: none; }
.detect-row.head { background: var(--bg2); font-family: var(--mono); font-size: 11.5px; text-transform: uppercase;
  letter-spacing: .08em; color: var(--faint); padding: 12px 22px; }
.detect-row .rule-name { font-weight: 650; font-size: 15px; }
.sev { font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .07em;
  border-radius: 5px; padding: 3px 9px; white-space: nowrap; }
.sev-critical { background: rgba(220,38,38,.13); color: var(--red); }
.sev-high { background: rgba(194,65,12,.13); color: var(--orange); }
.sev-medium { background: rgba(180,83,9,.13); color: var(--yellow); }
.detect-row p { margin: 0; color: var(--muted); font-size: 14px; }
.detect-note { margin-top: 18px; color: var(--faint); font-size: 13.5px; }
.detect-note a { color: var(--accent); text-decoration: none; }
@media (max-width: 720px) { .detect-row { grid-template-columns: 1fr; gap: 6px; } .detect-row.head { display: none; } }

/* ---------- how ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 36px; }
@media (max-width: 800px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 24px; }
.step-n { font-family: var(--mono); font-size: 12px; color: var(--accent); border: 1px solid rgba(10,10,10,.3);
  border-radius: 7px; padding: 3px 10px; display: inline-block; margin-bottom: 14px; background: var(--accent-dim); }
.step h3 { margin: 0 0 8px; font-size: 17px; }
.step p { color: var(--muted); margin: 0; font-size: 14px; }

/* ---------- why ---------- */
.why { background: var(--bg2); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.compare { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 36px; }
@media (max-width: 800px) { .compare { grid-template-columns: 1fr; } }
.cmp { background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius); padding: 24px; }
.cmp.hl { border-color: #0a0a0a; }
.cmp h3 { margin: 0 0 4px; font-size: 16px; }
.cmp .tag { font-family: var(--mono); font-size: 11.5px; color: var(--faint); display: block; margin-bottom: 14px; }
.cmp ul { margin: 0; padding: 0; list-style: none; }
.cmp li { color: var(--muted); font-size: 13.5px; padding: 6px 0 6px 22px; position: relative; }
.cmp li::before { content: "—"; position: absolute; left: 0; color: var(--faint); }
.cmp.hl li::before { content: ""; position: absolute; left: 2px; top: 12px; width: 8px; height: 5px;
  border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }

/* ---------- pricing ---------- */
.plans { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin-top: 36px; align-items: stretch; }
@media (max-width: 800px) { .plans { grid-template-columns: 1fr; max-width: 430px; margin-left: auto; margin-right: auto; } }
.plan { background: var(--panel); border: 1px solid var(--border-soft); border-radius: var(--radius);
  padding: 28px 24px; position: relative; display: flex; flex-direction: column; }
.plan.hl { border-color: #0a0a0a; border-width: 1.5px; }
.plan .flag { position: absolute; top: -12px; left: 50%; transform: translateX(-50%); background: var(--accent);
  color: var(--accent-ink); font-size: 10.5px; font-weight: 700; text-transform: uppercase; letter-spacing: .06em;
  padding: 4px 13px; border-radius: 14px; white-space: nowrap; }
.plan h3 { margin: 0; font-size: 16px; color: var(--muted); font-weight: 600; }
.price { font-family: var(--display); font-size: 42px; font-weight: 700; margin: 8px 0 0; letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums; }
.price span { font-size: 16px; color: var(--muted); font-weight: 500; font-family: var(--font); letter-spacing: 0; }
.per { color: var(--faint); font-size: 12.5px; margin: 2px 0 16px; font-family: var(--mono); }
.plan ul { list-style: none; margin: 0 0 24px; padding: 0; flex: 1; }
.plan li { font-size: 13.5px; padding: 6px 0 6px 22px; position: relative; color: var(--muted); }
.plan li::before { content: ""; position: absolute; left: 2px; top: 12px; width: 8px; height: 5px;
  border-left: 2px solid var(--green); border-bottom: 2px solid var(--green); transform: rotate(-45deg); }
.plan .btn { text-align: center; }
.fine { text-align: center; color: var(--faint); margin-top: 26px; font-size: 13.5px; max-width: 640px; margin-left: auto; margin-right: auto; }
.fine a { color: var(--accent); text-decoration: none; }

/* ---------- faq ---------- */
.faq-list { margin-top: 30px; max-width: 780px; }
.faq-list details { border-bottom: 1px solid var(--border-soft); }
.faq-list details:first-child { border-top: 1px solid var(--border-soft); }
.faq-list summary { cursor: pointer; padding: 19px 4px; font-weight: 600; font-size: 15.5px; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px; letter-spacing: -0.01em; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; color: var(--accent); font-size: 20px; font-weight: 400; flex-shrink: 0; }
.faq-list details[open] summary::after { content: "–"; }
.faq-list summary:hover { color: var(--accent); }
.faq-list .a { color: var(--muted); font-size: 14.5px; padding: 0 4px 22px; max-width: 680px; }
.faq-list .a p { margin: 0; }

/* ---------- final cta ---------- */
.final { text-align: center; border-top: 1px solid var(--border-soft); }
.final h2 { max-width: 640px; margin: 0 auto 14px; }
.final .lede { margin: 0 auto 30px; }

/* ---------- footer ---------- */
footer { border-top: 1px solid var(--border-soft); padding: 52px 0 34px; background: var(--bg2); }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 32px; margin-bottom: 40px; }
@media (max-width: 700px) { .foot-grid { grid-template-columns: 1fr; } }
.foot-brand p { color: var(--faint); font-size: 13.5px; margin: 12px 0 0; max-width: 280px; }
.foot-col h4 { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: .09em;
  color: var(--faint); margin: 0 0 14px; font-weight: 600; }
.foot-col a { display: block; color: var(--muted); text-decoration: none; font-size: 14px; padding: 5px 0; }
.foot-col a:hover { color: var(--text); }
.foot-base { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  border-top: 1px solid var(--border-soft); padding-top: 24px; color: var(--faint); font-size: 12.5px; font-family: var(--mono); }