:root {
  color-scheme: light dark;
  --ink: #17203a;
  --muted: #5d6680;
  --panel: rgba(255, 255, 255, 0.82);
  --line: rgba(23, 32, 58, 0.12);
  --accent: #5b4bdb;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 5%, rgba(255, 194, 92, .34), transparent 32rem),
    radial-gradient(circle at 90% 15%, rgba(91, 75, 219, .25), transparent 35rem),
    #f6f7ff;
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

main { width: min(760px, calc(100% - 32px)); margin: 0 auto; padding: 64px 0 40px; }

.hero { display: flex; align-items: center; gap: 24px; margin-bottom: 34px; }
.hero.compact { display: block; }
.eyebrow { margin: 0; color: var(--accent); font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
h1 { margin: 0; font-size: clamp(2.7rem, 9vw, 4.8rem); line-height: 1; letter-spacing: -.055em; }
.intro { margin: 14px 0 0; color: var(--muted); font-size: 1.08rem; }

.app-mark { width: 96px; aspect-ratio: 1; flex: 0 0 auto; padding: 15px; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; border-radius: 25%; background: #171936; box-shadow: 0 18px 45px rgba(23, 25, 54, .22); }
.app-mark span { border-radius: 50%; background: #ffbd3f; }
.app-mark span:nth-child(2) { background: #ff4f87; }
.app-mark span:nth-child(3) { background: #54d5dc; }
.app-mark span:nth-child(4) { background: #7868ff; }

section { margin: 18px 0; padding: 24px 28px; border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: 0 10px 30px rgba(41, 45, 90, .06); backdrop-filter: blur(15px); }
h2 { margin: 0 0 10px; font-size: 1.3rem; }
p, ol { margin-top: 8px; margin-bottom: 0; }
ol { padding-left: 1.4rem; }
li + li { margin-top: 6px; }
a { color: var(--accent); font-weight: 650; }
details { padding: 13px 0; border-top: 1px solid var(--line); }
details:first-of-type { border-top: 0; }
summary { cursor: pointer; font-weight: 700; }
nav { margin: 28px 4px; }
footer { color: var(--muted); font-size: .9rem; }

@media (max-width: 560px) {
  main { padding-top: 36px; }
  .hero { align-items: flex-start; flex-direction: column; }
  .app-mark { width: 76px; }
  section { padding: 21px; }
}

@media (prefers-color-scheme: dark) {
  :root { --ink: #f4f5ff; --muted: #b8bdd2; --panel: rgba(27, 29, 54, .82); --line: rgba(255, 255, 255, .12); --accent: #b0a7ff; }
  body { background: radial-gradient(circle at 15% 5%, rgba(178, 112, 38, .2), transparent 32rem), radial-gradient(circle at 90% 15%, rgba(91, 75, 219, .25), transparent 35rem), #10111f; }
}