/* Cadence landing page.
   Shares the console's language — near-black, sky/violet, mono numerals — but
   with editorial spacing, because this page has to make an argument rather
   than display an instrument. */

:root {
  --bg: #05070a;
  --panel: rgba(255, 255, 255, 0.028);
  --line: rgba(255, 255, 255, 0.075);
  --line-hi: rgba(255, 255, 255, 0.14);

  --text: #eaf1f8;
  --dim: #94a4b8;
  --faint: #5d6b80;

  --sky: #38bdf8;
  --sky-soft: #7dd3fc;
  --violet: #a78bfa;
  --amber: #fbbf24;
  --rose: #fb7185;
  --mint: #34d399;

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --max: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow-x: hidden;
  background-image:
    radial-gradient(1200px 700px at 12% 4%, rgba(56,189,248,0.10), transparent 62%),
    radial-gradient(1000px 620px at 88% 22%, rgba(167,139,250,0.085), transparent 60%);
  background-repeat: no-repeat;
}

.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 1; opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
}

code { font-family: var(--mono); font-size: 0.92em; }
em { font-style: normal; color: var(--sky); }
b { font-weight: 600; color: var(--text); }

/* ── nav ────────────────────────────────────────────────── */

.nav {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(5,7,10,0.8); backdrop-filter: blur(14px);
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); }
.mark {
  width: 22px; height: 22px; border-radius: 7px; position: relative; flex-shrink: 0;
  background: linear-gradient(140deg, var(--sky), #2a8fd4 48%, var(--violet));
  box-shadow: 0 0 20px rgba(56,189,248,0.4);
}
.mark::after { content: ""; position: absolute; inset: 8px 9.5px; background: var(--bg); border-radius: 1px; }
.mark.small { width: 16px; height: 16px; border-radius: 5px; display: inline-block; vertical-align: -3px; margin-right: 7px; }
.mark.small::after { inset: 6px 7px; }
.wordmark { font-weight: 600; font-size: 15px; letter-spacing: -0.02em; }

.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a {
  font-size: 13px; color: var(--dim); text-decoration: none; transition: color 0.16s;
}
.nav-links a:hover { color: var(--text); }
.nav-links .cta {
  color: var(--sky); border: 1px solid rgba(56,189,248,0.32);
  background: rgba(56,189,248,0.08); padding: 6px 14px; border-radius: 999px;
  font-weight: 500;
}
.nav-links .cta:hover { background: rgba(56,189,248,0.16); color: var(--sky-soft); }

/* ── hero ───────────────────────────────────────────────── */

.hero {
  position: relative; z-index: 2;
  max-width: var(--max); margin: 0 auto;
  padding: 88px 24px 64px;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 56px; align-items: center;
}

.eyebrow {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--faint);
  display: inline-block; margin-bottom: 20px;
  padding-bottom: 9px; border-bottom: 1px solid var(--line);
}

.hero h1 {
  font-size: clamp(34px, 4.4vw, 55px);
  line-height: 1.08; letter-spacing: -0.035em; font-weight: 700;
  margin-bottom: 22px;
}
.hero h1 em {
  background: linear-gradient(100deg, var(--amber), #f59e0b);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

.lede { font-size: 16.5px; color: var(--dim); margin-bottom: 14px; max-width: 46ch; }
.sub { font-size: 14.5px; color: var(--faint); margin-bottom: 30px; max-width: 46ch; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center;
  font-size: 14px; font-weight: 500; text-decoration: none;
  padding: 11px 22px; border-radius: 999px;
  transition: transform 0.12s, background 0.18s, border-color 0.18s;
}
.btn:active { transform: translateY(1px); }
.btn.primary {
  background: linear-gradient(135deg, var(--sky), #2a8fd4);
  color: #04121c; font-weight: 600;
  box-shadow: 0 10px 30px -10px rgba(56,189,248,0.65);
}
.btn.primary:hover { background: linear-gradient(135deg, var(--sky-soft), var(--sky)); }
.btn.ghost { border: 1px solid var(--line-hi); color: var(--dim); gap: 8px; }
.btn.ghost:hover { background: rgba(255,255,255,0.05); color: var(--text); }

/* Sets expectations before the click rather than after the permission
   prompt — a visitor who taps and hits a dead end does not come back. */
.btn-note {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--faint);
  padding: 2px 6px; border: 1px solid var(--line); border-radius: 999px;
}
.no-setup {
  margin-top: 14px; font-size: 12.5px; color: var(--faint);
}

.hero-visual {
  position: relative;
  border: 1px solid var(--line); border-radius: 18px;
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(56,189,248,0.07), transparent 60%),
    linear-gradient(180deg, rgba(255,255,255,0.022), rgba(255,255,255,0.004));
  padding: 18px; height: 400px;
  box-shadow: 0 30px 70px -34px rgba(0,0,0,0.95);
  display: flex; flex-direction: column;
  overflow: hidden;
}
#hero-ribbon {
  flex: 1; width: 100%; display: block;
  /* The scene is the argument, not a control surface. */
  cursor: default;
}

/* Points at the canyon the 3D scene carves out. */
.canyon-label {
  position: absolute; left: 50%; top: 26px; transform: translateX(-50%);
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.09em;
  text-transform: uppercase; color: var(--amber);
  background: rgba(5,7,10,0.82); border: 1px solid rgba(251,191,36,0.3);
  padding: 5px 11px; border-radius: 999px;
  white-space: nowrap; pointer-events: none;
  animation: labelFloat 5s ease-in-out infinite;
}
.canyon-label b { color: var(--amber); font-weight: 700; }
@keyframes labelFloat {
  0%, 100% { opacity: 0.85; transform: translateX(-50%) translateY(0); }
  50% { opacity: 1; transform: translateX(-50%) translateY(-3px); }
}
.hero-annotations {
  display: flex; justify-content: space-between; gap: 8px; margin-top: 12px;
}
.ann {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.08em;
  text-transform: uppercase; display: flex; align-items: center; gap: 6px;
}
.ann::before { content: ""; width: 8px; height: 8px; border-radius: 2px; }
.ann.user { color: var(--sky); }        .ann.user::before { background: var(--sky); }
.ann.agent { color: var(--violet); }    .ann.agent::before { background: var(--violet); }
.ann.gap { color: var(--amber); }
.ann.gap::before {
  background: repeating-linear-gradient(135deg, var(--amber) 0 2px, transparent 2px 4px);
}

/* ── bands ──────────────────────────────────────────────── */

.band {
  position: relative; z-index: 2;
  max-width: var(--max); margin: 0 auto; padding: 78px 24px;
  border-top: 1px solid var(--line);
}
.band.alt::before {
  content: ""; position: absolute; inset: 0 -50vw;
  background: rgba(255,255,255,0.012); z-index: -1;
  border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
}

.band-head { max-width: 62ch; margin-bottom: 42px; }
.kicker {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--sky); display: block; margin-bottom: 13px;
}
.band-head h2 {
  font-size: clamp(24px, 3vw, 33px); line-height: 1.18;
  letter-spacing: -0.028em; font-weight: 700; margin-bottom: 15px;
}
.band-head p { color: var(--dim); font-size: 15.5px; }

/* cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); gap: 16px; }
.card {
  border: 1px solid var(--line); border-radius: 14px;
  background: var(--panel); padding: 22px 21px;
  transition: border-color 0.2s, transform 0.2s;
}
.card:hover { border-color: var(--line-hi); transform: translateY(-2px); }
.card-n {
  font-family: var(--mono); font-size: 11px; color: var(--sky);
  letter-spacing: 0.1em; display: block; margin-bottom: 12px; opacity: 0.75;
}
.card h3 { font-size: 16px; font-weight: 600; margin-bottom: 9px; letter-spacing: -0.015em; }
.card p { font-size: 13.5px; color: var(--dim); line-height: 1.62; }

/* span tree */
.model-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 34px; align-items: start; }
.tree {
  font-family: var(--mono); font-size: 12.2px; line-height: 1.95;
  border: 1px solid var(--line); border-radius: 14px;
  background: rgba(0,0,0,0.36); padding: 24px 22px;
  overflow-x: auto; color: var(--dim);
}
.t-root { color: var(--text); font-weight: 700; }
.t-turn { color: var(--sky); font-weight: 700; }
.t-user { color: var(--sky-soft); }
.t-agent { color: var(--violet); }
.t-chat { color: var(--mint); }
.t-barge { color: var(--rose); }
.t-c { color: #46536a; }

.decisions { display: flex; flex-direction: column; gap: 20px; }
.decision { padding-left: 17px; border-left: 2px solid var(--line-hi); }
.decision h4 { font-size: 14.5px; font-weight: 600; margin-bottom: 7px; letter-spacing: -0.012em; }
.decision p { font-size: 13.5px; color: var(--dim); line-height: 1.62; }

/* split diagnostic */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.split-half { border: 1px solid var(--line); border-radius: 14px; padding: 24px 22px; }
.split-half.low  { background: linear-gradient(160deg, rgba(251,113,133,0.07), transparent 60%); }
.split-half.high { background: linear-gradient(160deg, rgba(251,191,36,0.07), transparent 60%); }
.split-tag {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.06em;
  display: inline-block; margin-bottom: 12px; padding: 3px 9px; border-radius: 4px;
}
.split-half.low .split-tag  { color: var(--rose); border: 1px solid rgba(251,113,133,0.3); }
.split-half.high .split-tag { color: var(--amber); border: 1px solid rgba(251,191,36,0.3); }
.split-half h3 { font-size: 17px; font-weight: 600; margin-bottom: 9px; letter-spacing: -0.018em; }
.split-half p { font-size: 13.5px; color: var(--dim); }
.split-note { margin-top: 20px; font-size: 14px; color: var(--dim); max-width: 66ch; }

/* loop */
.loop {
  display: flex; align-items: center; gap: 16px; flex-wrap: wrap;
  margin-bottom: 34px;
}
.loop-step {
  flex: 1; min-width: 170px;
  border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px;
  background: var(--panel); display: flex; flex-direction: column; gap: 3px;
}
.loop-n {
  font-family: var(--mono); font-size: 10px; color: var(--sky); letter-spacing: 0.1em;
}
.loop-step b { font-size: 14.5px; }
.loop-step span:last-child { font-size: 12.5px; color: var(--faint); }
.loop-arrow { width: 34px; color: var(--faint); flex-shrink: 0; }

/* metric table */
.metric-table { border: 1px solid var(--line); border-radius: 13px; overflow: hidden; }
.mt-head, .mt-row {
  display: grid; grid-template-columns: 1.25fr 0.42fr 1.8fr;
  gap: 16px; padding: 12px 18px; align-items: center;
}
.mt-head {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--faint);
  background: rgba(255,255,255,0.025); border-bottom: 1px solid var(--line);
}
.mt-row { border-bottom: 1px solid var(--line); font-size: 13px; color: var(--dim); }
.mt-row:last-child { border-bottom: none; }
.mt-row code { color: var(--sky); font-size: 12px; word-break: break-all; }
.mt-t {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.06em;
  padding: 2px 7px; border-radius: 3px; justify-self: start;
}
.mt-t.hist { color: var(--amber); border: 1px solid rgba(251,191,36,0.28); }
.mt-t.ctr  { color: var(--mint); border: 1px solid rgba(52,211,153,0.28); }

.note {
  margin-top: 20px; font-size: 13.5px; color: var(--faint);
  border-left: 2px solid var(--line-hi); padding-left: 16px; max-width: 72ch;
}
.note code { color: var(--sky); }

/* code block */
.code {
  font-family: var(--mono); font-size: 13px; line-height: 1.85;
  border: 1px solid var(--line); border-radius: 14px;
  background: rgba(0,0,0,0.38); padding: 24px 22px; overflow-x: auto;
  color: var(--dim);
}
.c-k { color: var(--violet); }
.c-s { color: var(--mint); }
.c-c { color: #46536a; }

/* ── footer ─────────────────────────────────────────────── */

.foot {
  position: relative; z-index: 2;
  max-width: var(--max); margin: 0 auto; padding: 32px 24px 52px;
  border-top: 1px solid var(--line);
  display: flex; align-items: center; justify-content: space-between;
  gap: 18px; flex-wrap: wrap;
  font-size: 13px; color: var(--faint);
}
.foot a { color: var(--dim); text-decoration: none; }
.foot a:hover { color: var(--sky); }
.foot-links { display: flex; gap: 18px; }

/* ── responsive ─────────────────────────────────────────── */

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 56px; }
  .hero-visual { height: 240px; }
  .model-grid, .split { grid-template-columns: 1fr; }
  .mt-head { display: none; }
  .mt-row { grid-template-columns: 1fr; gap: 6px; }
  .nav-links a:not(.cta) { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}