* {
  box-sizing: border-box;
}

:root {
  color-scheme: light dark;
  --bg: #0f172a;
  --bg-accent: #1e293b;
  --card: rgba(255, 255, 255, 0.9);
  --card-dark: rgba(15, 23, 42, 0.82);
  --text: #0f172a;
  --text-dark: #e2e8f0;
  --muted: #475569;
  --muted-dark: #94a3b8;
  --primary: #0ea5e9;
  --primary-strong: #0284c7;
  --border: rgba(148, 163, 184, 0.28);
  --shadow: 0 20px 50px rgba(15, 23, 42, 0.22);
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at top, rgba(14, 165, 233, 0.28), transparent 32%),
    linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
  color: var(--text);
}

body.dark {
  background:
    radial-gradient(circle at top, rgba(14, 165, 233, 0.18), transparent 30%),
    linear-gradient(180deg, var(--bg) 0%, var(--bg-accent) 100%);
  color: var(--text-dark);
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 48px 0 72px;
}

.hero,
.section {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(16px);
}

body.dark .hero,
body.dark .section {
  background: var(--card-dark);
}

.hero {
  padding: 36px;
  margin-bottom: 24px;
}

.section {
  padding: 28px;
  margin-bottom: 20px;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(14, 165, 233, 0.12);
  color: var(--primary-strong);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

body.dark .badge {
  color: #7dd3fc;
}

h1,
h2,
h3 {
  margin: 0 0 14px;
  line-height: 1.2;
}

h1 {
  font-size: clamp(32px, 4vw, 48px);
}

h2 {
  font-size: clamp(24px, 3vw, 30px);
}

p,
li {
  font-size: 17px;
  line-height: 1.7;
}

p {
  margin: 0 0 14px;
}

ul {
  margin: 0;
  padding-left: 22px;
}

.muted {
  color: var(--muted);
}

body.dark .muted {
  color: var(--muted-dark);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.card {
  padding: 20px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.46);
}

body.dark .card {
  background: rgba(30, 41, 59, 0.52);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 14px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 700;
  transition: transform 0.15s ease, background 0.15s ease;
}

.button.secondary {
  background: transparent;
  color: inherit;
  border: 1px solid var(--border);
}

.button:hover {
  transform: translateY(-1px);
  background: var(--primary-strong);
}

.button.secondary:hover {
  background: rgba(148, 163, 184, 0.12);
}

a {
  color: var(--primary-strong);
}

body.dark a {
  color: #7dd3fc;
}

.footer {
  margin-top: 28px;
  text-align: center;
  font-size: 14px;
}

hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 26px 0;
}

@media (max-width: 640px) {
  main {
    width: min(100% - 20px, 920px);
    padding: 20px 0 40px;
  }

  .hero,
  .section {
    padding: 20px;
    border-radius: 20px;
  }

  p,
  li {
    font-size: 16px;
  }
}