:root {
  --bg: #07111f;
  --bg-2: #0c1c30;
  --card: #0f2238;
  --card-hover: #14304d;
  --border: #1c3a5a;
  --text: #e6eef7;
  --muted: #8ba6c2;
  --accent: #38c8e8;
  --accent-2: #7fe0f2;
  --link: #5ad0ec;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 60%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  font-size: 17px;
}

a { color: var(--link); text-decoration: none; }
a:hover { color: var(--accent-2); text-decoration: underline; }

.container { max-width: 860px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  background: rgba(7, 17, 31, 0.85);
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }
.logo { font-weight: 700; font-size: 20px; color: var(--text); }
.logo span { color: var(--accent); }
.nav { display: flex; gap: 18px; flex-wrap: wrap; font-size: 15px; }
.nav a { color: var(--muted); }
.nav a:hover { color: var(--text); }

/* Main */
main { padding: 40px 0 60px; }

h1 {
  font-size: 34px;
  line-height: 1.25;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}
h2 { font-size: 24px; margin: 36px 0 12px; letter-spacing: -0.01em; }
h3 { font-size: 19px; margin: 24px 0 8px; }

p { margin-bottom: 16px; color: #c4d4e6; }

.lede { font-size: 19px; color: #dbe7f2; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 16px;
}
.card:hover { background: var(--card-hover); }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.tag {
  display: inline-block;
  background: rgba(56, 200, 232, 0.12);
  color: var(--accent-2);
  border: 1px solid rgba(56, 200, 232, 0.3);
  border-radius: 999px;
  padding: 2px 12px;
  font-size: 13px;
  margin-right: 6px;
}

.badge {
  display: inline-block;
  background: var(--accent);
  color: #04121f;
  font-weight: 600;
  border-radius: 6px;
  padding: 1px 8px;
  font-size: 13px;
}

ul, ol { margin: 0 0 16px 22px; color: #c4d4e6; }
li { margin-bottom: 8px; }

strong { color: var(--text); }

blockquote {
  border-left: 3px solid var(--accent);
  padding: 8px 16px;
  margin: 0 0 16px;
  background: rgba(56, 200, 232, 0.06);
  border-radius: 0 8px 8px 0;
  color: #b8cde2;
}

.callout {
  background: rgba(56, 200, 232, 0.08);
  border: 1px solid rgba(56, 200, 232, 0.35);
  border-radius: 10px;
  padding: 16px 18px;
  margin: 20px 0;
}

table { width: 100%; border-collapse: collapse; margin: 16px 0; font-size: 15px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--accent-2); font-weight: 600; }
td { color: #c4d4e6; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  color: var(--muted);
  font-size: 14px;
}
.site-footer .container { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; }

/* FAQ */
details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 18px;
  margin-bottom: 10px;
}
details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--text);
}
details[open] summary { margin-bottom: 8px; }

@media (max-width: 640px) {
  h1 { font-size: 27px; }
  body { font-size: 16px; }
  .nav { gap: 12px; }
}