:root {
  color-scheme: light dark;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --radius: 14px;
  --t: 200ms;
  --bg: #f5f6f8; --surface: #ffffff; --surface-2: #eef0f4; --text: #14171c; --muted: #4e5868; --border: #dde1e8;
  --accent: #4338ca; --accent-soft: #eceafd; --on-accent: #ffffff;
  --success: #15803d; --success-soft: #e6f6ec; --warn: #8a5a00; --warn-soft: #fbf1dc; --danger: #b91c1c;
  --code-bg: #f8f9fb; --out-bg: #14171c; --out-text: #e6e9ee; --out-prompt: #9aa2ff;
  --k: #b4232f; --n: #1d4ed8; --f: #6d28d9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1015; --surface: #151a21; --surface-2: #1d232c; --text: #e8ebf0; --muted: #a3adbb; --border: #2a313c;
    --accent: #a5acff; --accent-soft: #232650; --on-accent: #0d1015;
    --success: #4ade80; --success-soft: #11291b; --warn: #fbbf24; --warn-soft: #30240b; --danger: #f87171;
    --code-bg: #10141a; --out-bg: #080a0d;
    --k: #ff7b86; --n: #79b8ff; --f: #c4a5ff;
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: var(--sans); line-height: 1.6; -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: 1rem; top: -4rem; background: var(--accent); color: var(--on-accent); padding: 0.6rem 1rem; border-radius: 8px; z-index: 10; }
.skip:focus { top: 1rem; }
.wrap { width: min(72rem, 100% - 2rem); margin-inline: auto; }
.narrow { width: min(46rem, 100% - 2rem); }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 0.6em; }
h1 { font-size: clamp(2rem, 1.3rem + 3.2vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.3rem); }
h3 { font-size: 1.15rem; }
.lead { font-size: clamp(1.05rem, 1rem + 0.4vw, 1.3rem); color: var(--muted); max-width: 42rem; }
.note, .hint { color: var(--muted); font-size: 0.95rem; }
.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.85rem; font-weight: 700; color: var(--accent); margin: 0 0 0.75rem; }
.site-header { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem 1.5rem; width: min(72rem, 100% - 2rem); margin: 0 auto; padding: 1rem 0; }
.brand { display: inline-flex; align-items: center; color: var(--text); text-decoration: none; }
.brand img { display: block; height: 2.75rem; width: auto; }
.site-header nav { display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 1.1rem; }
.site-header nav a:not(.btn) { color: var(--text); text-decoration: none; padding: 0.5rem 0.25rem; min-height: 2.75rem; display: inline-flex; align-items: center; }
.site-header nav a:not(.btn):hover, .site-header nav a[aria-current] { text-decoration: underline; }
@media (max-width: 40rem) { .nav-extra { display: none !important; } .site-header nav { gap: 0.25rem 0.9rem; } }
.btn { display: inline-flex; align-items: center; justify-content: center; border: 2px solid var(--accent); background: var(--accent); color: var(--on-accent); font: inherit; font-weight: 700; padding: 0.7rem 1.4rem; min-height: 3rem; border-radius: 999px; text-decoration: none; cursor: pointer; transition: transform var(--t) ease, background-color var(--t) ease; }
.btn:hover { transform: translateY(-1px); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.small { min-height: 2.5rem; padding: 0.35rem 1.1rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 1rem; }
.hero { padding: clamp(1.5rem, 4vw, 3.5rem) 0; }
.hero-grid { display: grid; gap: 2.5rem; align-items: center; }
@media (min-width: 60rem) { .hero-grid { grid-template-columns: 1.1fr 0.9fr; } }
.band { padding: clamp(2rem, 5vw, 4rem) 0; }
.band.alt { background: var(--surface); border-block: 1px solid var(--border); }
.cards { display: grid; gap: 1rem; grid-template-columns: 1fr; }
@media (min-width: 48rem) { .cards { grid-template-columns: repeat(3, 1fr); } .two { grid-template-columns: 1fr 1fr; } }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.25rem; }
.band.alt .card { background: var(--bg); }
.card p { margin: 0; color: var(--muted); }
.two { display: grid; gap: 1rem; grid-template-columns: 1fr; }
.card.yes { border-color: var(--success); }
.card.yes h3 span { color: var(--success); }
.card.maybe { border-color: var(--warn); }
.card.maybe h3 span { color: var(--warn); }
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 1.25rem; }
.steps li { display: flex; gap: 1rem; align-items: flex-start; }
.steps p { margin: 0; color: var(--muted); }
.step-n { flex: none; display: grid; place-items: center; width: 2.6rem; height: 2.6rem; border-radius: 50%; background: var(--accent); color: var(--on-accent); font-weight: 800; }
details { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 0.25rem 1.1rem; margin-bottom: 0.6rem; }
summary { cursor: pointer; font-weight: 700; min-height: 2.75rem; display: flex; align-items: center; }
details p { margin: 0 0 1rem; color: var(--muted); }
.form { display: grid; gap: 1rem; margin-top: 1.25rem; }
.field { display: grid; gap: 0.35rem; }
.field label { font-weight: 600; }
.field input[type=email], .field input[type=text], .field select { font: inherit; color: var(--text); background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 0.65rem 0.85rem; min-height: 3rem; width: 100%; }
.field.check { display: flex; gap: 0.75rem; align-items: flex-start; }
.field.check input { width: 1.4rem; height: 1.4rem; margin-top: 0.2rem; accent-color: var(--accent); flex: none; }
.field.check label { font-weight: 400; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.dev-note { background: var(--warn-soft); color: var(--warn); border: 1px solid var(--warn); border-radius: var(--radius); padding: 0.75rem 1rem; font-weight: 600; margin: 0 0 1rem; }
.tiers { display: grid; gap: 1rem; margin: 2rem 0 1rem; grid-template-columns: 1fr; }
@media (min-width: 48rem) { .tiers { grid-template-columns: repeat(3, 1fr); } }
.tier { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 1.5rem; display: flex; flex-direction: column; gap: 0.75rem; }
.tier[data-featured] { border: 2px solid var(--accent); }
.tier h2 { font-size: 1.4rem; margin: 0; }
.tier .price { margin: 0; } .tier .price strong { font-size: 2rem; } .tier .price span { color: var(--muted); display: block; font-size: 0.9rem; }
.tier ul { padding-left: 1.2rem; margin: 0 0 0.5rem; flex: 1; }
.legal h2 { margin-top: 1.75rem; font-size: 1.3rem; }
.legal table { border-collapse: collapse; width: 100%; }
.legal th, .legal td { text-align: left; vertical-align: top; padding: 0.5rem 0.75rem 0.5rem 0; border-bottom: 1px solid var(--border); }
.legal th { width: 40%; font-weight: 600; color: var(--muted); }
.site-footer { width: min(72rem, 100% - 2rem); margin: 0 auto; padding: 2rem 0 3rem; color: var(--muted); font-size: 0.95rem; }
.site-footer p { margin: 0.25rem 0; }
.demo { margin: 0; }
.demo figcaption { font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); margin-bottom: 0.5rem; }
.demo-card { background: var(--surface); border: 1px solid var(--border); border-radius: calc(var(--radius) + 6px); padding: 1.25rem; display: grid; gap: 0.9rem; box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08); }
.demo-q { margin: 0; font-weight: 800; font-size: 1.25rem; }
.demo-code { margin: 0; background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 0.9rem 1rem; overflow-x: auto; font-family: var(--mono); font-size: 0.95rem; line-height: 1.55; }
.demo-code .k { color: var(--k); } .demo-code .n { color: var(--n); } .demo-code .f { color: var(--f); }
.demo-answers { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; grid-template-columns: 1fr 1fr; }
.demo-answers li { display: flex; align-items: center; gap: 0.5rem; border: 2px solid var(--border); border-radius: 10px; padding: 0.5rem 0.65rem; transition: border-color var(--t) ease, background-color var(--t) ease; min-height: 2.75rem; }
.demo-answers code { font-family: var(--mono); }
.demo-answers .badge { display: grid; place-items: center; width: 1.7rem; height: 1.7rem; border-radius: 50%; background: var(--surface-2); font-weight: 700; font-size: 0.85rem; flex: none; }
.demo-answers .tick { margin-left: auto; color: var(--success); font-weight: 800; }
.demo-answers li.correct { border-color: var(--success); background: var(--success-soft); }
.demo-answers li.selected { border-color: var(--accent); background: var(--accent-soft); }
.demo-status { display: flex; align-items: center; gap: 0.5rem; margin: 0; font-weight: 700; color: var(--success); }
.demo-status .ok { display: grid; place-items: center; width: 1.4rem; height: 1.4rem; border: 2px solid currentColor; border-radius: 50%; font-size: 0.8rem; }
.demo-status.checking { color: var(--muted); }
.demo-out { background: var(--out-bg); color: var(--out-text); border-radius: 10px; padding: 0.7rem 1rem; font-family: var(--mono); }
.demo-out strong { font-family: var(--sans); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; opacity: 0.7; }
.demo-out ol { list-style: none; margin: 0.25rem 0 0; padding: 0; }
.demo-out li::before { content: "› "; color: var(--out-prompt); }
.demo-out li { transition: opacity var(--t) ease, transform var(--t) ease; }
.demo-expl { margin: 0; color: var(--muted); font-size: 0.95rem; }
.is-anim .demo-out li, .is-anim .demo-expl { opacity: 0; transform: translateY(6px); }
.is-anim .demo-out li.on, .is-anim .demo-expl.on { opacity: 1; transform: none; }
.is-anim .demo-answers li.correct:not(.reveal) { border-color: var(--border); background: transparent; }
.is-anim .demo-answers li.correct:not(.reveal) .tick { visibility: hidden; }
.is-anim .demo-status { opacity: 0; transition: opacity var(--t) ease; }
.is-anim .demo-status.show { opacity: 1; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}