:root {
  --bg: #0b1020;
  --card: #121a2f;
  --muted: #8aa0bf;
  --text: #e6eefc;
  --primary: #4f8cff;
  --primary-700: #3f74d1;
  --danger: #ff6b6b;
  --success: #22c55e;
  --warning: #f59e0b;
  --border: #1f2a44;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.45;
}

.app-header, .app-footer {
  padding: 24px 16px;
  text-align: center;
}

.subtitle {
  color: var(--muted);
  margin-top: 4px;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 16px;
  display: grid;
  gap: 16px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.25);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 12px 16px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

label {
  color: var(--muted);
  font-size: 14px;
}

input[type="number"], select {
  background: #0e1528;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}

.checkbox-label {
  display: flex;
  gap: 8px;
  align-items: center;
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 12px;
}

.btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #0e1528;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
}

.btn.primary {
  background: var(--primary);
  border-color: transparent;
}

.btn.primary:hover {
  background: var(--primary-700);
}

.hidden { display: none; }

.tier-badge {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 700;
  margin-bottom: 8px;
}

.tier-a { background: rgba(34,197,94,0.15); color: #86efac; border-color: rgba(34,197,94,0.35); }
.tier-b { background: rgba(245,158,11,0.15); color: #fcd34d; border-color: rgba(245,158,11,0.35); }
.tier-c { background: rgba(239,68,68,0.15); color: #fca5a5; border-color: rgba(239,68,68,0.35); }

.score-text {
  color: var(--muted);
}

.tier-details {
  margin-top: 8px;
}

.highlights {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--border);
  color: var(--muted);
}

.about-tiers {
  padding-left: 18px;
}

.about-tiers li { margin: 6px 0; }