:root {
  --bg: #0B0B14;
  --panel: #15151F;
  --border: #262636;
  --text: #F5F5FA;
  --muted: #A0A0B8;
  --faint: #6B6B85;
  --cefr: #5B50E8;
  --ielts: #0EA5E9;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 760px; margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }

a { color: #8B93FF; text-decoration: none; }
a:hover { text-decoration: underline; }

.brand {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0;
  background: linear-gradient(90deg, var(--cefr), var(--ielts));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.tagline { color: var(--muted); margin: 0.4rem 0 2rem; }

h1.doc-title { font-size: 1.7rem; margin: 0.5rem 0 0.25rem; }
.updated { color: var(--faint); font-size: 0.85rem; margin: 0 0 2rem; }

h2 { font-size: 1.15rem; margin: 2rem 0 0.5rem; }

p, li { color: #D6D6E4; }

.cards { display: grid; grid-template-columns: 1fr; gap: 1rem; margin: 1.5rem 0 2.5rem; }
@media (min-width: 560px) { .cards { grid-template-columns: 1fr 1fr; } }

.card {
  display: block;
  padding: 1.5rem;
  border-radius: 18px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-top: 3px solid var(--accent);
  transition: transform 0.15s ease, border-color 0.15s ease;
}
.card:hover { transform: translateY(-3px); border-color: var(--accent); text-decoration: none; }
.card h3 { margin: 0 0 0.35rem; color: var(--text); }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; }

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9rem;
}

.back { display: inline-block; margin-bottom: 1.5rem; color: var(--muted); font-size: 0.9rem; }

footer { color: var(--faint); font-size: 0.82rem; margin-top: 3rem; }