:root {
  --bg: #f6f7f4;
  --surface: #ffffff;
  --text: #17201c;
  --muted: #5d6a63;
  --border: #e1e5df;
  --accent: #0f6e5a;
  --accent-soft: #e3f2ec;
  --danger: #c2412d;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1412;
    --surface: #171d1a;
    --text: #eef2ef;
    --muted: #9aa59f;
    --border: #28312d;
    --accent: #3fb59a;
    --accent-soft: #15302a;
    --danger: #ef7a66;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, "Geeza Pro", sans-serif;
}
a { color: var(--accent); }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 760px; }
.logo { width: 32px; height: 32px; display: block; }

.top { position: sticky; top: 0; z-index: 2; background: color-mix(in srgb, var(--bg) 82%, transparent); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 60px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 700; text-decoration: none; }
.top nav { display: flex; gap: 18px; font-size: 15px; }
.top nav a { color: var(--muted); text-decoration: none; }
.top nav a:hover { color: var(--text); }
@media (max-width: 420px) { .brand span { display: none; } }

main { padding: 32px 16px 56px; }

.hero { display: grid; gap: 32px; align-items: center; padding: 24px 0 40px; }
@media (min-width: 860px) { .hero { grid-template-columns: 1.1fr 1fr; padding: 48px 0 64px; } }
.chip { display: inline-block; margin: 0 0 14px; padding: 4px 12px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); font-size: 14px; font-weight: 600; }
.hero h1 { font-size: clamp(34px, 7vw, 54px); line-height: 1.08; letter-spacing: -0.02em; margin: 0 0 16px; text-wrap: balance; }
.lead { font-size: 19px; color: var(--muted); margin: 0; max-width: 34em; }

.demo { margin: 0; padding: 20px; border-radius: 22px; background: var(--surface); border: 1px solid var(--border); box-shadow: 0 18px 40px -24px color-mix(in srgb, var(--accent) 45%, transparent); }
.demo .line { padding: 12px 0; border-bottom: 1px solid var(--border); }
.demo .who { font-size: 12px; font-weight: 600; color: var(--accent); text-transform: uppercase; letter-spacing: 0.04em; }
.demo .ar { margin: 4px 0 2px; font-size: 21px; font-weight: 600; }
.demo .en { margin: 0; color: var(--muted); }
.demo figcaption { display: flex; align-items: center; gap: 8px; padding-top: 12px; font-size: 14px; color: var(--muted); }
.demo .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--danger); }

.features { display: grid; gap: 14px; grid-template-columns: repeat(auto-fit, minmax(min(100%, 280px), 1fr)); }
.features article { padding: 20px; border-radius: 18px; background: var(--surface); border: 1px solid var(--border); }
.features h2 { font-size: 18px; margin: 0 0 6px; }
.features p { margin: 0; color: var(--muted); font-size: 16px; }

.promise { margin-top: 40px; padding: 28px 24px; border-radius: 22px; background: var(--accent-soft); }
.promise h2 { margin: 0 0 8px; font-size: 24px; }
.promise p { margin: 0; max-width: 40em; }

.doc { overflow-wrap: anywhere; }
.doc h1 { font-size: 34px; line-height: 1.15; margin: 0 0 6px; }
.doc h1 + p { color: var(--muted); font-size: 15px; margin-top: 0; }
.doc h2 { font-size: 20px; margin: 32px 0 8px; }
.doc ul { padding-inline-start: 22px; }
.doc li + li { margin-top: 8px; }

footer { border-top: 1px solid var(--border); padding: 24px 0 40px; color: var(--muted); font-size: 14px; }
footer p { margin: 4px 0; }