:root {
  --bg: #f6f7fb;
  --card: #ffffff;
  --text: #16192c;
  --muted: #6b7089;
  --primary: #4f46e5;
  --on-primary: #ffffff;
  --border: #e3e5ef;
  --success: #16a34a;
  --success-bg: #dcfce7;
  --error: #dc2626;
  --error-bg: #fee2e2;
  --glow: rgba(79, 70, 229, 0.18);
  --radius: 20px;
  --max: 1080px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e1020;
    --card: #1a1d33;
    --text: #f1f2fa;
    --muted: #9a9fbc;
    --primary: #818cf8;
    --on-primary: #0e1020;
    --border: #2b2f4d;
    --success: #4ade80;
    --success-bg: #12301f;
    --error: #f87171;
    --error-bg: #3a1a1f;
    --glow: rgba(129, 140, 248, 0.22);
  }
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 Inter, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--primary); }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* nav */
header.nav {
  position: sticky; top: 0; z-index: 10;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; color: var(--text); text-decoration: none; letter-spacing: -0.01em; }
.brand img { width: 32px; height: 32px; border-radius: 9px; }
.nav nav { display: flex; gap: 22px; align-items: center; }
.nav nav a { color: var(--muted); text-decoration: none; font-size: 15px; font-weight: 500; }
.nav nav a:hover { color: var(--text); }
@media (max-width: 720px) { .nav nav a.hide-sm { display: none; } }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 22px; border-radius: 14px; font-weight: 700; font-size: 16px;
  text-decoration: none; border: 1px solid transparent; transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn.primary { background: var(--primary); color: var(--on-primary); box-shadow: 0 10px 30px -8px var(--glow), 0 4px 12px -4px var(--glow); }
.btn.ghost { border-color: var(--border); color: var(--text); background: var(--card); }
.btn.small { padding: 9px 16px; font-size: 14px; border-radius: 12px; }

/* hero */
.hero { position: relative; overflow: hidden; padding: 84px 0 72px; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto auto; width: 720px; height: 720px; z-index: -1;
  background: radial-gradient(closest-side, var(--glow), transparent);
}
.hero::after {
  content: ""; position: absolute; left: -200px; bottom: -300px; width: 600px; height: 600px; z-index: -1;
  background: radial-gradient(closest-side, var(--glow), transparent);
}
.hero .wrap { display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .hero .wrap { grid-template-columns: 1fr; } .hero { padding-top: 48px; } }
.pill {
  display: inline-block; padding: 6px 14px; border-radius: 99px; font-size: 13px; font-weight: 700;
  background: var(--card); border: 1px solid var(--border); color: var(--primary); margin-bottom: 20px;
}
h1 { font-size: clamp(38px, 6vw, 62px); line-height: 1.05; letter-spacing: -0.03em; margin: 0 0 20px; font-weight: 850; }
h1 span { padding-bottom: 0.15em; background: linear-gradient(90deg, var(--primary), #ec4899); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { font-size: 20px; color: var(--muted); max-width: 540px; margin: 0 0 32px; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; }
.note { margin-top: 16px; font-size: 14px; color: var(--muted); }

/* phone mockup */
.phone {
  width: min(320px, 100%); margin: 0 auto; background: var(--card); border: 1px solid var(--border);
  border-radius: 40px; padding: 18px; box-shadow: 0 40px 80px -30px var(--glow), 0 10px 30px -10px rgba(0,0,0,.15);
  transform: rotate(2deg);
}
.phone .bar { width: 90px; height: 6px; border-radius: 9px; background: var(--border); margin: 0 auto 18px; }
.q-label { font-size: 12px; font-weight: 700; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
.q-text { font-size: 19px; font-weight: 700; margin: 6px 0 16px; line-height: 1.35; }
.opt { padding: 12px 14px; border-radius: 14px; border: 1.5px solid var(--border); margin-bottom: 9px; font-weight: 600; font-size: 15px; }
.opt.ok { border-color: var(--success); background: var(--success-bg); }
.opt.bad { border-color: var(--error); background: var(--error-bg); }
.score { display: flex; justify-content: space-between; margin-top: 14px; font-size: 13px; color: var(--muted); font-weight: 600; }
.track { height: 6px; border-radius: 9px; background: var(--border); margin-top: 8px; overflow: hidden; }
.track i { display: block; height: 100%; width: 62%; background: var(--primary); border-radius: 9px; }

/* sections */
section { padding: 80px 0; }
.eyebrow { color: var(--primary); font-weight: 800; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; }
h2 { font-size: clamp(30px, 4vw, 42px); letter-spacing: -0.02em; line-height: 1.12; margin: 8px 0 14px; font-weight: 800; }
.sub { color: var(--muted); max-width: 620px; margin: 0 0 44px; font-size: 18px; }
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid { grid-template-columns: 1fr; } }
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: transform .2s, box-shadow .2s; }
.card:hover { transform: translateY(-4px); box-shadow: 0 20px 40px -20px var(--glow); }
.card .ico {
  width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; font-size: 22px; margin-bottom: 16px;
  background: color-mix(in srgb, var(--primary) 14%, transparent);
}
.card h3 { margin: 0 0 6px; font-size: 19px; }
.card p { margin: 0; color: var(--muted); font-size: 15.5px; }

.levels { display: flex; flex-wrap: wrap; gap: 12px; }
.level { flex: 1 1 140px; background: var(--card); border: 1px solid var(--border); border-radius: 18px; padding: 20px; text-align: center; }
.level b { display: block; font-size: 30px; letter-spacing: -0.02em; color: var(--primary); }
.level span { color: var(--muted); font-size: 14px; }

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center; }
@media (max-width: 860px) { .split { grid-template-columns: 1fr; gap: 28px; } }
.ticks { list-style: none; padding: 0; margin: 20px 0 0; }
.ticks li { padding-left: 32px; position: relative; margin-bottom: 12px; }
.ticks li::before {
  content: "✓"; position: absolute; left: 0; top: 2px; width: 22px; height: 22px; border-radius: 50%;
  background: var(--success-bg); color: var(--success); font-size: 13px; font-weight: 800; display: grid; place-items: center;
}
.room { text-align: center; }
.room .code { font-size: 44px; font-weight: 850; letter-spacing: .25em; margin: 6px 0 14px; color: var(--primary); }
.rank { text-align: left; margin-top: 8px; }
.rank div { display: flex; justify-content: space-between; padding: 10px 0; border-top: 1px solid var(--border); font-weight: 600; }
.rank div span:last-child { color: var(--muted); font-variant-numeric: tabular-nums; }

.banner {
  background: linear-gradient(135deg, var(--primary), #7c3aed 60%, #ec4899);
  color: #fff; border-radius: 32px; padding: 56px 32px; text-align: center;
}
.banner h2 { color: #fff; margin-top: 0; }
.banner p { color: rgba(255,255,255,.85); margin: 0 auto 28px; max-width: 520px; }
.banner .btn { background: #fff; color: #4f46e5; }

footer { border-top: 1px solid var(--border); padding: 36px 0 48px; color: var(--muted); font-size: 15px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; }
footer a { color: var(--muted); margin-left: 18px; }
footer a:first-child { margin-left: 0; }

/* text pages */
.doc { padding: 56px 20px 80px; max-width: 800px; }
.doc h1 { font-size: 40px; }
.doc h2 { font-size: 24px; margin-top: 40px; }
.doc p, .doc li { color: var(--text); }
.doc .updated { color: var(--muted); }

@media (prefers-reduced-motion: no-preference) {
  .reveal { animation: up .7s both; }
  @keyframes up { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: none; } }
}

/* language switch */
.nav nav a.lang {
  padding: 4px 10px; border: 1px solid var(--border); border-radius: 99px;
  font-size: 13px; font-weight: 700; letter-spacing: .04em; color: var(--muted); background: var(--card);
}
.nav nav a.lang:hover { color: var(--text); }