:root {
  color-scheme: light dark;
  --bg: #0d1321;
  --card: #151f33;
  --card-soft: rgba(255,255,255,.06);
  --text: #f8fafc;
  --muted: #a8b3c7;
  --accent: #7dd3fc;
  --ok: #86efac;
  --danger: #fca5a5;
  --border: rgba(255,255,255,.12);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, rgba(125,211,252,.18), transparent 34rem), var(--bg);
  color: var(--text);
}
.shell { width: min(980px, calc(100% - 28px)); margin: 0 auto; padding: 28px 0 60px; }
.hero { margin-bottom: 20px; }
.eyebrow { color: var(--accent); font-weight: 800; text-transform: uppercase; letter-spacing: .14em; font-size: .78rem; margin: 0 0 .45rem; }
h1 { font-size: clamp(2rem, 8vw, 4.4rem); line-height: .98; margin: .2em 0; }
h2 { margin-top: 0; }
h3 { margin: .2rem 0 .7rem; }
p { color: var(--muted); }
.app-stack { display: grid; gap: 14px; }
.card { border: 1px solid var(--border); background: rgba(21,31,51,.88); border-radius: 22px; padding: 20px; box-shadow: 0 24px 80px rgba(0,0,0,.22); }
.row { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; }
.form { display: grid; gap: 14px; }
.two-col { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.full { grid-column: 1 / -1; }
label { display: grid; gap: 6px; color: var(--muted); font-size: .95rem; }
input, textarea {
  width: 100%; border: 1px solid var(--border); border-radius: 14px;
  background: var(--card-soft); color: var(--text); padding: 13px 14px; font: inherit;
}
textarea { resize: vertical; }
button { border: 0; border-radius: 999px; background: var(--accent); color: #08111f; font-weight: 800; padding: 12px 18px; font: inherit; cursor: pointer; }
button.secondary { background: rgba(255,255,255,.08); color: var(--text); border: 1px solid var(--border); }
.error, .message.error { color: var(--danger); }
.message.ok { color: var(--ok); }
.message { min-height: 1.2em; margin-bottom: 0; }
.muted { color: var(--muted); margin: 0; }
.hidden { display: none; }
.status-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); gap: 10px; margin-top: 16px; }
.status-grid article, .set-row { background: rgba(0,0,0,.18); border: 1px solid var(--border); border-radius: 16px; padding: 14px; }
.status-grid span { display: block; color: var(--muted); font-size: .86rem; margin-bottom: 4px; }
.status-grid strong { display: block; font-size: 1rem; }
.set-toolbar, .set-row-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
#sets { display: grid; gap: 10px; }
@media (max-width: 680px) {
  .shell { width: min(100% - 20px, 980px); padding-top: 18px; }
  .card { padding: 16px; border-radius: 18px; }
  .two-col { grid-template-columns: 1fr; }
  .row { align-items: stretch; }
  button { width: 100%; }
  .set-toolbar { align-items: stretch; flex-direction: column; }
}