:root {
  --bg: #0b0d12;
  --card: #141926;
  --card2: #1b2233;
  --text: #e8ecf4;
  --muted: #93a0b8;
  --accent: #6c8cff;
  --accent2: #35d0a5;
  --border: #232b3d;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 50% -10%, #16203a 0%, var(--bg) 60%);
  color: var(--text);
  line-height: 1.5;
}
.hero { max-width: 1000px; margin: 0 auto; padding: 56px 20px 24px; text-align: center; }
.brand { color: var(--accent); font-weight: 700; letter-spacing: .5px; margin: 0 0 12px; font-size: .9rem; text-transform: uppercase; }
h1 { font-size: clamp(1.7rem, 5vw, 2.8rem); line-height: 1.15; margin: 0 0 12px; }
.sub { color: var(--muted); max-width: 620px; margin: 0 auto 24px; }
.controls { display: flex; flex-direction: column; gap: 14px; align-items: center; }
#q {
  width: 100%; max-width: 560px; padding: 14px 16px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--card); color: var(--text); font-size: 1rem;
}
#q:focus { outline: none; border-color: var(--accent); }
.cats { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; }
.cat {
  padding: 7px 13px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); cursor: pointer; font-size: .85rem;
}
.cat.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.count { color: var(--muted); font-size: .85rem; margin: 18px 0 0; }
.grid {
  max-width: 1100px; margin: 0 auto; padding: 20px;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 18px;
}
.card {
  background: linear-gradient(180deg, var(--card) 0%, var(--card2) 100%);
  border: 1px solid var(--border); border-radius: 16px; padding: 20px; display: flex; flex-direction: column; gap: 10px;
}
.card h2 { font-size: 1.1rem; margin: 0; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag { font-size: .72rem; color: var(--accent2); border: 1px solid #244; background: #10202a; padding: 3px 8px; border-radius: 999px; }
.problema { color: var(--muted); font-size: .92rem; margin: 0; }
.for { font-size: .82rem; color: var(--muted); }
pre.prompt {
  background: #0a0e17; border: 1px solid var(--border); border-radius: 10px; padding: 12px;
  white-space: pre-wrap; word-break: break-word; font-size: .82rem; color: #cdd8ee; margin: 0;
  max-height: 190px; overflow: auto;
}
meta, .meta { display: flex; flex-wrap: wrap; gap: 10px; color: var(--muted); font-size: .78rem; }
.steps { margin: 0; padding-left: 18px; font-size: .85rem; color: #b9c4d8; }
button.copy {
  margin-top: auto; padding: 11px; border-radius: 10px; border: none; cursor: pointer;
  background: var(--accent); color: #fff; font-weight: 600; font-size: .9rem;
}
button.copy:hover { filter: brightness(1.1); }
button.copy.done { background: var(--accent2); }
.foot { max-width: 1000px; margin: 40px auto; padding: 24px 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: .85rem; text-align: center; }
.muted { color: var(--muted); }