:root {
  color-scheme: light dark;
  --canvas: #f5f3ef;
  --surface: rgba(255, 255, 255, 0.78);
  --ink: #17181a;
  --muted: #606167;
  --accent: #655cc8;
  --accent-soft: #e4e0ff;
  --line: rgba(62, 57, 76, 0.11);
}

* { box-sizing: border-box; }
html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; background: var(--canvas); color: var(--ink); }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 88% 4%, rgba(110, 99, 217, .14), transparent 25rem), var(--canvas); }
a { color: var(--accent); text-decoration-thickness: .08em; text-underline-offset: .18em; }
.shell { width: min(760px, calc(100% - 40px)); margin: 0 auto; padding: 28px 0 72px; }
nav { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 72px; }
.brand { color: var(--ink); text-decoration: none; font-size: 1.15rem; font-weight: 700; letter-spacing: -.03em; }
.navlinks { display: flex; gap: 18px; font-size: .92rem; }
.eyebrow { color: var(--accent); font-size: .78rem; font-weight: 750; letter-spacing: .11em; text-transform: uppercase; }
h1 { margin: 12px 0 18px; max-width: 18ch; font-size: clamp(2.35rem, 8vw, 4.5rem); line-height: .98; letter-spacing: -.055em; }
h2 { margin-top: 44px; font-size: 1.35rem; letter-spacing: -.025em; }
p, li { color: var(--muted); font-size: 1.04rem; line-height: 1.72; }
.lede { max-width: 57ch; font-size: 1.2rem; }
.glass { margin: 36px 0; padding: 22px; border: 1px solid rgba(255,255,255,.66); border-radius: 28px; background: var(--surface); box-shadow: 0 18px 45px rgba(32, 27, 48, .08); backdrop-filter: blur(18px); }
.promise { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.promise article { padding: 18px; border-radius: 20px; background: rgba(228, 224, 255, .66); }
.promise h2 { margin: 0 0 6px; font-size: 1rem; }
.promise p { margin: 0; font-size: .91rem; line-height: 1.5; }
.meta { padding-top: 26px; border-top: 1px solid var(--line); font-size: .9rem; }
details { border-top: 1px solid var(--line); padding: 18px 0; }
details:last-child { border-bottom: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 650; }
footer { margin-top: 60px; color: var(--muted); font-size: .88rem; }
@media (max-width: 640px) { nav { margin-bottom: 48px; } .promise { grid-template-columns: 1fr; } .navlinks { gap: 12px; } }
@media (prefers-color-scheme: dark) {
  :root { --canvas: #0d0e11; --surface: rgba(28,29,35,.84); --ink: #f5f3ee; --muted: #b8b8bf; --accent: #a79eff; --accent-soft: #302c58; --line: rgba(255,255,255,.12); }
  body { background: radial-gradient(circle at 88% 4%, rgba(110, 99, 217, .18), transparent 25rem), var(--canvas); }
  .glass { border-color: rgba(255,255,255,.14); }
  .promise article { background: rgba(48,44,88,.7); }
}