:root {
  --bg: #0f172a;
  --card: #1e293b;
  --ink: #f8fafc;
  --muted: #94a3b8;
  --g1: #38bdf8;
  --g2: #a855f7;
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-tap-highlight-color: transparent;
}
.chooser {
  max-width: 480px;
  margin: 0 auto;
  padding: 20px 16px 40px;
}
.chooser-kicker {
  margin: 0;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.chooser-head h1 {
  margin: 6px 0 10px;
  font-size: 1.75rem;
  line-height: 1.2;
}
.chooser-lead {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.4;
}
.grade-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.grade-card {
  display: flex;
  align-items: stretch;
  min-height: 104px;
  text-decoration: none;
  color: inherit;
  border-radius: 16px;
  overflow: hidden;
  border: 2px solid #334155;
  background: var(--card);
  touch-action: manipulation;
}
.grade-1 {
  border-color: color-mix(in srgb, var(--g1) 55%, #334155);
  background: color-mix(in srgb, var(--g1) 22%, #0f172a);
}
.grade-2 {
  border-color: color-mix(in srgb, var(--g2) 45%, #334155);
  background: color-mix(in srgb, var(--g2) 18%, #0f172a);
  opacity: 0.92;
}
.grade-bar {
  flex: 0 0 16px;
}
.grade-1 .grade-bar { background: var(--g1); }
.grade-2 .grade-bar { background: var(--g2); }
.grade-body {
  flex: 1;
  padding: 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.grade-name {
  font-size: 1.25rem;
  font-weight: 800;
}
.grade-meta {
  font-size: 0.95rem;
  color: var(--muted);
  line-height: 1.35;
}
.grade-cta {
  margin-top: 6px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--ink);
}
.chooser-foot {
  margin-top: 28px;
  text-align: center;
  font-size: 0.85rem;
}
.muted { color: var(--muted); }