:root {
  color-scheme: light;
  --ink: #111827;
  --muted: #5b6472;
  --line: #d9e1ea;
  --paper: #f8fbff;
  --panel: #ffffff;
  --dark: #0d1321;
  --cyan: #35d0c5;
  --lime: #d9f85d;
  --coral: #ff7a59;
  --indigo: #4158d0;
  --shadow: 0 24px 70px rgba(17, 24, 39, 0.12);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    linear-gradient(180deg, rgba(53,208,197,0.14), rgba(255,255,255,0) 430px),
    var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(18px, 4vw, 54px);
  background: rgba(248, 251, 255, 0.88);
  border-bottom: 1px solid rgba(217, 225, 234, 0.85);
  backdrop-filter: blur(16px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; letter-spacing: 0; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--dark);
  color: var(--lime);
  box-shadow: inset 0 -3px 0 rgba(53, 208, 197, 0.55);
}
nav { display: flex; align-items: center; gap: 18px; color: var(--muted); font-size: 14px; }
nav a:hover { color: var(--ink); }
.primary-action, .secondary-action, .nav-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-weight: 750;
  letter-spacing: 0;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.primary-action { background: var(--dark); color: #fff; box-shadow: 0 14px 36px rgba(13, 19, 33, 0.18); }
.secondary-action, .nav-cta { background: #fff; color: var(--dark); border-color: var(--line); }
.primary-action:hover, .secondary-action:hover, .nav-cta:hover { transform: translateY(-1px); box-shadow: 0 16px 34px rgba(17, 24, 39, 0.12); }
.full { width: 100%; }
.hero-lab {
  display: grid;
  grid-template-columns: minmax(320px, .85fr) minmax(520px, 1.15fr);
  gap: clamp(28px, 4vw, 54px);
  align-items: center;
  padding: clamp(46px, 7vw, 84px) clamp(18px, 5vw, 72px) 36px;
}
.hero-copy { max-width: 660px; }
.eyebrow {
  margin: 0 0 12px;
  color: #007a72;
  font-weight: 800;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: .08em;
}
h1, h2, h3, p { letter-spacing: 0; }
h1 {
  margin: 0;
  font-size: clamp(42px, 5.8vw, 76px);
  line-height: .98;
  max-width: 760px;
}
h2 { margin: 0; font-size: clamp(30px, 3.6vw, 48px); line-height: 1.06; }
h3 { margin: 0; font-size: 20px; }
.hero-lede, .section-head p, .resource-hero p, .checkout-page p, .legal-page p, .legal-page li {
  color: var(--muted);
  line-height: 1.7;
  font-size: 18px;
}
.hero-actions, .resource-actions, .cta-stack { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 26px; }
.model-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.model-row span {
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255,255,255,.72);
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}
.studio-console {
  background: #fff;
  border: 1px solid rgba(17, 24, 39, 0.1);
  border-radius: 8px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.console-topbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  padding: 14px;
  border-bottom: 1px solid var(--line);
  background: #f7fafc;
}
.console-topbar div { display: flex; align-items: center; gap: 8px; }
.status-dot { width: 10px; height: 10px; border-radius: 99px; background: var(--lime); box-shadow: 0 0 0 4px rgba(217,248,93,.24); }
select {
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 0 10px;
}
.prompt-tabs { display: grid; grid-template-columns: repeat(4, 1fr); padding: 10px; gap: 8px; border-bottom: 1px solid var(--line); }
.prompt-tabs button, .billing-toggle button, .modal-billing button {
  min-height: 38px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--muted);
  font-weight: 800;
}
.prompt-tabs .is-active, .billing-toggle .is-active, .modal-billing .is-active { background: var(--dark); color: #fff; border-color: var(--dark); }
.console-grid { display: grid; grid-template-columns: 1.25fr .75fr; gap: 0; min-height: 318px; }
.editor-pane { padding: 16px; border-right: 1px solid var(--line); }
.pane-head, .asset-rail, .score-grid { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.pane-head { color: var(--muted); font-size: 13px; font-weight: 700; margin-bottom: 12px; }
textarea {
  width: 100%;
  min-height: 172px;
  resize: vertical;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
  padding: 14px;
  line-height: 1.55;
  color: var(--ink);
  background: #fcfdff;
}
.asset-rail { flex-wrap: wrap; justify-content: flex-start; margin-top: 12px; }
.asset-rail span {
  padding: 8px 10px;
  border-radius: 8px;
  background: #eff6ff;
  color: #1f4b8f;
  font-size: 13px;
  font-weight: 750;
}
.run-pane { padding: 16px; display: grid; gap: 12px; align-content: start; }
.run-pane label { display: grid; gap: 8px; color: var(--muted); font-size: 13px; font-weight: 800; }
input[type=range] { width: 100%; accent-color: var(--cyan); }
.score-grid { display: grid; grid-template-columns: repeat(3, 1fr); }
.score-grid div {
  display: grid;
  gap: 4px;
  padding: 12px;
  background: #f8fafc;
  border: 1px solid var(--line);
  border-radius: 8px;
}
.score-grid span { color: var(--muted); font-size: 12px; font-weight: 800; }
.score-grid strong { font-size: 20px; }
.history-panel { display: grid; gap: 8px; padding: 14px; background: #101827; color: #dbeafe; }
.branch-line { display: grid; grid-template-columns: 18px 1fr auto; align-items: center; gap: 10px; font-size: 13px; }
.branch-line span { width: 12px; height: 12px; border-radius: 99px; border: 2px solid #6b7280; }
.branch-line.active span { background: var(--lime); border-color: var(--lime); }
.branch-line em { color: #9fb0c8; font-style: normal; }
.signal-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  margin: 20px clamp(18px, 5vw, 72px) 0;
  border: 1px solid var(--line);
  background: var(--line);
  border-radius: 8px;
  overflow: hidden;
}
.signal-strip article { display: grid; gap: 8px; padding: 18px; background: rgba(255,255,255,.84); }
.signal-strip span, .feature-card p, .plain-grid p, .risk-list p, .step-row p, .pricing-card p, .pricing-card li, .pricing-card small, .product-figure figcaption, .fineprint {
  color: var(--muted);
  line-height: 1.65;
}
.band, .split-band, .faq-band, .pricing-page, .resource-page, .legal-page, .checkout-page {
  max-width: 1180px;
  margin: 0 auto;
  padding: clamp(58px, 8vw, 96px) clamp(18px, 4vw, 28px);
}
.split-band { display: grid; grid-template-columns: 1fr .72fr; gap: 34px; align-items: center; max-width: 1240px; }
.section-head { max-width: 780px; margin-bottom: 28px; }
.feature-grid, .pricing-grid, .plain-grid, .risk-list, .step-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.feature-grid { grid-template-columns: repeat(2, 1fr); margin-top: 22px; }
.plain-grid { grid-template-columns: repeat(2, 1fr); }
.risk-list { grid-template-columns: repeat(3, 1fr); }
.feature-card, .plain-grid article, .risk-list article, .step-row article, .pricing-card {
  background: rgba(255,255,255,.9);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
.step-row article span {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  margin-bottom: 12px;
  border-radius: 8px;
  background: var(--cyan);
  color: #003734;
  font-weight: 900;
}
.product-figure { margin: 0; }
.product-figure img {
  display: block;
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.product-figure figcaption { margin-top: 12px; font-size: 14px; }
.billing-toggle, .modal-billing { display: inline-flex; gap: 8px; padding: 6px; border: 1px solid var(--line); border-radius: 8px; background: #fff; margin-bottom: 22px; }
.pricing-grid { grid-template-columns: repeat(3, 1fr); }
.pricing-card { position: relative; display: grid; gap: 14px; }
.pricing-card.featured { border-color: rgba(53, 208, 197, 0.8); box-shadow: 0 26px 60px rgba(53, 208, 197, 0.2); }
.pricing-card.is-selected { outline: 3px solid rgba(53, 208, 197, 0.18); }
.badge { justify-self: start; padding: 6px 9px; border-radius: 8px; background: var(--lime); color: #263100; font-size: 12px; font-weight: 900; }
.badge.subtle { background: #e2e8f0; color: #334155; }
.price-line { display: flex; align-items: baseline; gap: 6px; }
.price-line strong { font-size: 34px; }
.pricing-card ul { padding-left: 18px; min-height: 158px; }
.pricing-card button { width: 100%; }
.resource-page section, .legal-page section { margin-top: 42px; }
.resource-hero {
  padding: 42px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 20px 60px rgba(17,24,39,.08);
}
.resource-hero h1 { max-width: 860px; }
.resource-cta { display: grid; grid-template-columns: 1fr auto; gap: 24px; align-items: center; padding: 24px; border-radius: 8px; border: 1px solid var(--line); background: #fff; }
.faq-list { display: grid; gap: 12px; max-width: 900px; }
details {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 18px;
}
summary { cursor: pointer; font-weight: 850; }
.checkout-page { min-height: 62vh; display: grid; align-content: center; justify-items: start; gap: 18px; }
.legal-page { max-width: 940px; }
.legal-page h1, .checkout-page h1 { font-size: clamp(36px, 5vw, 58px); }
.legal-page h2 { margin-top: 32px; font-size: 26px; }
.site-footer {
  padding: 42px clamp(18px, 5vw, 72px);
  background: var(--dark);
  color: #e5eefb;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr .8fr; gap: 28px; }
.footer-grid p, .fineprint { color: #adbbcf; }
.footer-grid div { display: grid; align-content: start; gap: 10px; }
.footer-grid a { color: #e5eefb; }
.footer-brand .brand-mark { background: #fff; color: var(--dark); }
.fineprint { margin-top: 28px; font-size: 13px; }
.checkout-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 18px;
  background: rgba(13, 19, 33, .42);
}
.checkout-overlay[hidden] { display: none; }
body.checkout-open > :not(.checkout-overlay) { filter: blur(4px); }
.checkout-dialog {
  width: min(560px, 100%);
  max-height: 90vh;
  overflow: auto;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.22);
  background: #fff;
  padding: 24px;
  box-shadow: 0 30px 100px rgba(0,0,0,.28);
  position: relative;
}
.dialog-close {
  position: absolute;
  right: 14px;
  top: 14px;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
}
.modal-plan-list { display: grid; gap: 8px; margin: 10px 0 16px; }
.modal-plan-list button {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
  min-height: 54px;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;
  text-align: left;
}
.modal-plan-list .is-selected { border-color: var(--cyan); box-shadow: inset 4px 0 0 var(--cyan); }
.modal-plan-list span { color: var(--muted); font-size: 13px; }
.checkout-summary { display: grid; gap: 4px; padding: 16px; background: #f8fafc; border: 1px solid var(--line); border-radius: 8px; margin-bottom: 16px; }
.checkout-summary strong { font-size: 32px; }
.checkout-error { padding: 12px; border-radius: 8px; background: #fff1f2; color: #9f1239; }
.secondary-link { color: #007a72; font-weight: 850; }
@media (max-width: 1020px) {
  nav { display: none; }
  .hero-lab, .split-band { grid-template-columns: 1fr; }
  .studio-console { order: -1; }
  .signal-strip, .feature-grid, .pricing-grid, .plain-grid, .risk-list, .step-row, .footer-grid { grid-template-columns: 1fr 1fr; }
  .resource-cta { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .site-header { align-items: stretch; }
  .nav-cta { display: none; }
  h1 { font-size: 42px; }
  .hero-lab { padding-top: 28px; }
  .console-grid, .signal-strip, .feature-grid, .pricing-grid, .plain-grid, .risk-list, .step-row, .footer-grid { grid-template-columns: 1fr; }
  .score-grid { grid-template-columns: 1fr; }
  .prompt-tabs { grid-template-columns: 1fr 1fr; }
  .pricing-card ul { min-height: auto; }
  .resource-hero { padding: 24px; }
}