:root {
  --bg: #f5f7fb;
  --surface: #ffffff;
  --fg: #0f172a;
  --muted: #5b6475;
  --line: #e3e8f0;
  --accent: #1f6feb;
  --accent-soft: #e8f0fe;
  --accent-fg: #ffffff;
  --ok: #16a34a;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 8px 24px rgba(15, 23, 42, .06);
  --radius: 18px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --surface: #131a26;
    --fg: #eef2f8;
    --muted: #9aa4b5;
    --line: #232d3d;
    --accent: #5894ff;
    --accent-soft: #16233b;
    --accent-fg: #0b0f17;
    --ok: #4ade80;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 400 16.5px/1.65 "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap { max-width: 880px; margin: 0 auto; padding: 0 16px; }

/* Header */
.top {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--line);
}
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 12px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--fg); font-weight: 700; font-size: 18px; letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
/* The icon PNG is square; round it like iOS does (~22.5% corner radius). */
.mark {
  display: block; width: 32px; height: 32px; border-radius: 7.5px; flex: none;
  box-shadow: 0 1px 4px rgba(31, 111, 235, .3);
}
.mark.big {
  width: 88px; height: 88px; border-radius: 20px;
  box-shadow: 0 10px 30px rgba(31, 111, 235, .35), 0 2px 6px rgba(15, 23, 42, .12);
}
nav { display: flex; gap: 4px; }
nav a {
  color: var(--muted); font-size: 15px; font-weight: 500;
  padding: 6px 10px; border-radius: 8px;
}
nav a:hover { color: var(--fg); background: var(--accent-soft); text-decoration: none; }
nav a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

/* Page heading */
.hero { padding: 56px 0 32px; }
.hero h1 { font-size: clamp(30px, 6vw, 44px); line-height: 1.12; letter-spacing: -.025em; margin: 0 0 12px; font-weight: 800; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0; max-width: 60ch; }
.eyebrow {
  display: inline-block; font-size: 13px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
  color: var(--accent); background: var(--accent-soft); padding: 4px 10px; border-radius: 999px; margin-bottom: 16px;
}
.date { color: var(--muted); font-size: 14px; margin-top: 12px; }

/* Landing hero */
.home-hero { padding: 72px 0 40px; text-align: center; }
.home-hero .mark.big { margin: 0 auto 24px; }
.home-hero h1 { font-size: clamp(34px, 7vw, 54px); line-height: 1.08; letter-spacing: -.03em; margin: 0 0 16px; font-weight: 800; }
.home-hero h1 span { color: var(--accent); }
.home-hero p.lead { font-size: 19px; color: var(--muted); margin: 0 auto; max-width: 34em; }
.cta { margin-top: 28px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 20px; border-radius: 12px; font-weight: 600; font-size: 16px;
  background: var(--accent); color: var(--accent-fg);
}
.btn:hover { text-decoration: none; filter: brightness(1.06); }
.btn.ghost { background: var(--surface); color: var(--fg); border: 1px solid var(--line); }
.btn[aria-disabled="true"] { cursor: default; }

/* Exam facts */
.stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px;
  margin: 8px 0 48px;
}
.stat { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; text-align: center; box-shadow: var(--shadow); }
.stat b { display: block; font-size: 30px; line-height: 1.1; letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: 14px; }

/* Feature cards */
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin-bottom: 56px; }
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px; box-shadow: var(--shadow);
}
.card h3 { margin: 12px 0 4px; font-size: 17px; letter-spacing: -.01em; }
.card p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.55; }
.icon {
  width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent);
}
.icon svg { width: 22px; height: 22px; }
.section-title { font-size: 24px; letter-spacing: -.02em; margin: 0 0 16px; }

/* Long-form pages */
.summary {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow); margin-bottom: 20px;
}
.summary h2 { margin: 0 0 12px; font-size: 17px; }
.checks { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.checks li { display: flex; gap: 10px; align-items: flex-start; }
.checks svg { flex: none; width: 20px; height: 20px; margin-top: 3px; color: var(--ok); }

.doc {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 8px 28px 28px; box-shadow: var(--shadow); margin-bottom: 56px;
}
.doc h2 { font-size: 19px; letter-spacing: -.01em; margin: 28px 0 6px; }
.doc p { margin: 0 0 12px; }

/* Support */
.contact {
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  background: linear-gradient(135deg, var(--accent-soft), var(--surface));
  border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow);
  margin-bottom: 36px;
}
.contact h2 { margin: 0 0 4px; font-size: 20px; }
.contact p { margin: 0; color: var(--muted); }

.faq { display: grid; gap: 10px; margin-bottom: 56px; }
.faq details {
  background: var(--surface); border: 1px solid var(--line); border-radius: 14px;
  padding: 0 20px; box-shadow: var(--shadow);
}
.faq summary {
  cursor: pointer; list-style: none; padding: 16px 0; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; width: 10px; height: 10px; flex: none;
  border-right: 2px solid var(--muted); border-bottom: 2px solid var(--muted);
  transform: rotate(45deg) translateY(-3px); transition: transform .2s;
}
.faq details[open] summary::after { transform: rotate(-135deg) translateY(-2px); }
.faq details p { margin: 0 0 16px; color: var(--muted); }

/* Footer */
footer { border-top: 1px solid var(--line); padding: 28px 0 40px; color: var(--muted); font-size: 14px; }
footer .wrap { display: grid; gap: 10px; }
footer .links { display: flex; gap: 18px; flex-wrap: wrap; }
footer .links a { color: var(--muted); }
footer .links a:hover { color: var(--fg); }

@media (max-width: 560px) {
  body { font-size: 16px; }
  .brand span { display: none; }
  nav a { padding: 6px 8px; font-size: 14.5px; }
  .hero { padding: 36px 0 24px; }
  .home-hero { padding: 48px 0 32px; }
  .stats { gap: 8px; }
  .stat { padding: 16px 8px; }
  .stat b { font-size: 24px; }
  .doc { padding: 4px 20px 20px; }
}