:root {
  color-scheme: light dark;
  --bg: #f4f7fb;
  --surface: rgba(255, 255, 255, 0.78);
  --text: #18202a;
  --secondary: #667180;
  --accent: #0a84ff;
  --border: rgba(255, 255, 255, 0.86);
  --shadow: 0 18px 55px rgba(29, 55, 85, 0.12);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  line-height: 1.65;
  background:
    radial-gradient(circle at 14% 8%, rgba(10, 132, 255, 0.16), transparent 34rem),
    radial-gradient(circle at 88% 25%, rgba(86, 201, 168, 0.15), transparent 30rem),
    var(--bg);
}

main { width: min(860px, calc(100% - 32px)); margin: 0 auto; padding: 42px 0 72px; }

nav { display: flex; justify-content: space-between; align-items: center; gap: 18px; margin-bottom: 32px; }
nav a { color: inherit; text-decoration: none; }
.brand { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; }
.links { display: flex; flex-wrap: wrap; gap: 18px; font-size: 0.92rem; }
.links a { color: var(--secondary); }

.hero, article, .card {
  border: 1px solid var(--border);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(135%);
  -webkit-backdrop-filter: blur(24px) saturate(135%);
}

.hero { padding: clamp(28px, 6vw, 54px); }
article { padding: clamp(24px, 5vw, 44px); }
h1 { margin: 0 0 10px; font-size: clamp(2.2rem, 8vw, 4.7rem); line-height: 1.02; letter-spacing: -0.055em; }
h2 { margin: 2.3rem 0 0.5rem; font-size: 1.22rem; letter-spacing: -0.015em; }
h3 { margin: 1.8rem 0 0.3rem; font-size: 1.02rem; }
p, li { color: var(--secondary); }
.lead { max-width: 620px; margin: 0 0 26px; font-size: 1.05rem; }
.eyebrow { margin: 0 0 12px; color: var(--accent); font-weight: 700; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 18px;
  border-radius: 15px;
  color: white;
  background: var(--accent);
  font-weight: 650;
  text-decoration: none;
}
.button.secondary { color: var(--text); background: rgba(127, 127, 127, 0.12); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 18px; }
.card { padding: 24px; }
.card h2 { margin-top: 0; }
.meta { margin: 0 0 28px; font-size: 0.9rem; }
a { color: var(--accent); }
footer { padding: 28px 6px 0; color: var(--secondary); font-size: 0.84rem; text-align: center; }

@media (max-width: 640px) {
  main { padding-top: 24px; }
  nav { align-items: flex-start; }
  .links { justify-content: flex-end; gap: 10px 14px; }
  .grid { grid-template-columns: 1fr; }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1218;
    --surface: rgba(25, 32, 41, 0.78);
    --text: #f5f7fa;
    --secondary: #adb7c3;
    --border: rgba(255, 255, 255, 0.1);
    --shadow: 0 18px 55px rgba(0, 0, 0, 0.26);
  }
}