:root {
  --bg: #f4f6fb;
  --panel: #ffffff;
  --line: #dbe3f0;
  --text: #122033;
  --muted: #62748b;
  --accent: #4769b8;
  font-family: Inter, system-ui, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: var(--bg); color: var(--text); }
button, input { font: inherit; }
.page { width: min(1180px, calc(100% - 24px)); margin: 0 auto; padding: 24px 0 40px; display: grid; gap: 18px; }
.header { display: flex; justify-content: space-between; gap: 16px; align-items: end; }
.eyebrow { margin: 0 0 8px; color: var(--accent); text-transform: uppercase; letter-spacing: .08em; font-size: 12px; font-weight: 700; }
h1, h2, h3, p { margin: 0; }
.controls input {
  min-height: 44px; padding: 0 14px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--panel); color: var(--text); width: min(320px, 70vw);
}
.layout { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 18px; }
.list-panel, .hero, .card, .detail-card {
  border: 1px solid var(--line); border-radius: 22px; background: var(--panel); box-shadow: 0 18px 40px rgba(16, 24, 40, .06);
}
.list-panel { padding: 14px; display: grid; gap: 10px; align-content: start; }
.card {
  padding: 14px; text-align: left; color: inherit; cursor: pointer;
}
.card.is-active { border-color: var(--accent); }
.card h3 { margin-bottom: 6px; font-size: 16px; }
.muted { color: var(--muted); }
.hero {
  min-height: 240px; padding: 26px;
  background: linear-gradient(135deg, var(--hero-start), var(--hero-end));
  color: white;
}
.hero .subtitle, .hero .summary { color: rgba(255,255,255,.84); }
.hero .summary { margin-top: 16px; line-height: 1.6; max-width: 56ch; }
.detail-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 18px; }
.detail-card { padding: 18px; }
.stack { display: grid; gap: 10px; margin-top: 12px; }
.item { padding: 12px; border-radius: 14px; background: #f8faff; border: 1px solid var(--line); }
@media (max-width: 900px) {
  .layout, .detail-grid, .header { grid-template-columns: 1fr; display: grid; }
}