:root {
  --bg: #0e1116;
  --panel: #161a22;
  --ink: #e6e8eb;
  --muted: #8b95a3;
  --accent: #6ee7b7;
  --border: #232a36;
  --radius: 14px;
  --max: 920px;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  min-height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.hero {
  padding: 64px 24px 32px;
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
}

.mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 10px;
  background: var(--accent);
  color: #06231a;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-bottom: 20px;
}

h1 { font-size: 2.25rem; margin: 0 0 6px; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 0; }

main {
  flex: 1;
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px 64px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 32px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  transition: border-color 120ms ease, transform 120ms ease;
}

.card:hover { border-color: var(--accent); transform: translateY(-1px); }

.card h2 { margin: 0 0 6px; font-size: 1.05rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.92rem; line-height: 1.45; }
.card.placeholder { border-style: dashed; }
.card code { background: #11151c; padding: 1px 6px; border-radius: 6px; font-size: 0.85em; }

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

footer {
  border-top: 1px solid var(--border);
  padding: 16px 24px;
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.85rem;
  max-width: var(--max);
  margin: 0 auto;
  width: 100%;
}