:root {
  color-scheme: dark;
  --background: #08111f;
  --panel: #101d30;
  --panel-border: rgba(191, 219, 254, 0.16);
  --text: #e8f1ff;
  --muted: #a4b5cf;
  --blue: #5ab0ff;
  --orange: #f6821f;
  --shadow: 0 22px 65px rgba(0, 0, 0, 0.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 85% 0%, rgba(246, 130, 31, 0.2), transparent 29rem),
    radial-gradient(circle at 0% 24%, rgba(90, 176, 255, 0.17), transparent 28rem),
    var(--background);
}

.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 28px 0; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--text); }
.brand { color: var(--text) !important; font-weight: 760; letter-spacing: -0.03em; }
.brand span { color: var(--orange); }

.hero { max-width: 790px; padding: 82px 0 68px; }
.eyebrow { margin: 0 0 15px; color: var(--blue); font-size: 0.81rem; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { max-width: 740px; margin-bottom: 22px; font-size: clamp(2.65rem, 7vw, 5.7rem); line-height: 0.97; letter-spacing: -0.065em; }
h2 { margin-bottom: 10px; font-size: 1.22rem; letter-spacing: -0.025em; }
.intro { max-width: 630px; color: var(--muted); font-size: clamp(1.05rem, 2vw, 1.25rem); line-height: 1.65; }

.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 46px; padding: 0 18px; border: 1px solid transparent; border-radius: 9px; font: inherit; font-weight: 700; text-decoration: none; cursor: pointer; transition: transform 160ms ease, background 160ms ease; }
.button:hover { transform: translateY(-2px); }
.primary { color: #0d1a2d; background: var(--orange); }
.secondary { color: var(--text); border-color: var(--panel-border); background: rgba(16, 29, 48, 0.72); }
.result { min-height: 24px; margin: 19px 0 0; color: var(--muted); font-size: 0.93rem; }
.result.success { color: #87e9bd; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card, .checklist { border: 1px solid var(--panel-border); background: rgba(16, 29, 48, 0.72); box-shadow: var(--shadow); }
.card { min-height: 218px; padding: 25px; border-radius: 13px; }
.card p { margin-bottom: 0; color: var(--muted); line-height: 1.58; }
.icon { display: inline-grid; place-items: center; width: 35px; height: 35px; margin-bottom: 32px; border-radius: 50%; color: var(--orange); background: rgba(246, 130, 31, 0.14); font-size: 0.75rem; font-weight: 800; }

.checklist { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 45px; margin: 74px 0 43px; padding: 36px; border-radius: 14px; }
.checklist h2 { margin-bottom: 0; font-size: clamp(1.45rem, 3vw, 2rem); }
.checklist ol { display: grid; gap: 12px; margin: 0; padding-left: 22px; color: var(--muted); line-height: 1.5; }
code { padding: 0.12em 0.35em; border-radius: 4px; color: #d7e7ff; background: rgba(90, 176, 255, 0.11); font-size: 0.92em; }
footer { display: flex; justify-content: space-between; padding: 0 0 35px; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 720px) {
  .hero { padding: 58px 0 52px; }
  .grid, .checklist { grid-template-columns: 1fr; }
  .checklist { gap: 28px; margin-top: 48px; padding: 26px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .button { transition: none; }
}