:root {
  --bg: #f6f5fb;
  --surface: #ffffff;
  --text: #1c1a2e;
  --muted: #6b6884;
  --border: #e3e1ef;
  --accent: #5b4bdb;
  --accent-soft: #ece9ff;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12111c;
    --surface: #1c1b2b;
    --text: #edecf7;
    --muted: #a3a0bd;
    --border: #2d2b42;
    --accent: #9d91ff;
    --accent-soft: #2a2650;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
main { max-width: 1000px; margin: 0 auto; padding: 32px 16px 64px; }
header h1 { margin: 0; font-size: 2rem; letter-spacing: -0.02em; }
header h1 span { color: var(--accent); }
header p { margin: 4px 0 0; color: var(--muted); }
header a { color: var(--accent); }
#filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 24px 0 16px; }
#filters button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 6px 14px;
  border-radius: 999px;
  font: inherit;
  cursor: pointer;
}
#filters button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
#grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  color: inherit;
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }
.card .icon { font-size: 1.6rem; }
.card .cat { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent); }
.card p { margin: 0; color: var(--muted); font-size: 0.9rem; }
section.ask {
  margin-top: 32px;
  padding: 20px;
  background: var(--accent-soft);
  border-radius: 16px;
}
section.ask h2 { margin: 0 0 12px; font-size: 1.1rem; }
#ask { display: flex; flex-wrap: wrap; gap: 8px; }
#ask input {
  flex: 1 1 200px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text);
  font: inherit;
}
#ask input#code { flex: 0 1 160px; }
#ask button {
  padding: 10px 18px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: #fff;
  font: inherit;
  cursor: pointer;
}
#ask button:disabled { opacity: 0.6; }
#answer { white-space: pre-wrap; margin: 12px 0 0; }