:root {
  color-scheme: light dark;
  --bg: var(--tg-theme-bg-color, #f4f6f8);
  --card: var(--tg-theme-secondary-bg-color, #ffffff);
  --text: var(--tg-theme-text-color, #17212b);
  --muted: var(--tg-theme-hint-color, #6b7785);
  --accent: var(--tg-theme-button-color, #2aabee);
  --accent-text: var(--tg-theme-button-text-color, #ffffff);
  --border: color-mix(in srgb, var(--muted) 25%, transparent);
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
.app-shell { max-width: 720px; margin: 0 auto; padding: 24px 16px 32px; }
.app-header { margin-bottom: 24px; }
.eyebrow { color: var(--accent); font-size: .8rem; font-weight: 700; letter-spacing: .08em; margin: 0 0 4px; text-transform: uppercase; }
h1, h2 { line-height: 1.2; margin: 0; }
h1 { font-size: 1.75rem; }
h2 { font-size: 1.25rem; margin-bottom: 8px; }
.muted { color: var(--muted); margin: 6px 0 18px; }
.step { background: var(--card); border-radius: 16px; padding: 20px; }
.field { display: grid; gap: 6px; margin: 16px 0; }
.compact-field { margin: 10px 0; }
label { font-weight: 600; }
select, input[type="number"] { background: var(--card); border: 1px solid var(--border); border-radius: 10px; color: var(--text); font: inherit; min-height: 46px; padding: 8px 12px; width: 100%; }
.option-list, .discipline-groups { display: grid; gap: 8px; margin-top: 12px; }
.option { align-items: center; border: 1px solid var(--border); border-radius: 10px; display: flex; gap: 10px; min-height: 46px; padding: 9px 12px; }
.option:has(input:checked) { border-color: var(--accent); }
.option input, .select-all input { accent-color: var(--accent); height: 20px; width: 20px; }
.select-all { align-items: center; display: flex; gap: 10px; margin: 14px 0; min-height: 44px; }
.discipline-group { border-top: 1px solid var(--border); padding-top: 14px; }
.discipline-group h3 { font-size: 1rem; margin: 0 0 8px; }
details { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 16px; }
summary { cursor: pointer; font-weight: 700; min-height: 32px; }
.lesson-grid { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
.review { display: grid; gap: 12px; margin: 20px 0 0; }
.review div { border-bottom: 1px solid var(--border); padding-bottom: 8px; }
.review dt { color: var(--muted); font-size: .85rem; }
.review dd { margin: 2px 0 0; }
.feedback { background: color-mix(in srgb, var(--accent) 15%, var(--card)); border-radius: 10px; margin-bottom: 16px; padding: 12px; }
.feedback.error { background: #ffe5e5; color: #8a1c1c; }
.actions { display: flex; gap: 10px; justify-content: space-between; margin-top: 16px; }
button { border: 0; border-radius: 10px; cursor: pointer; font: inherit; font-weight: 700; min-height: 46px; padding: 8px 16px; }
button.primary { background: var(--accent); color: var(--accent-text); margin-left: auto; }
button.secondary { background: transparent; border: 1px solid var(--border); color: var(--text); }
button:disabled { cursor: wait; opacity: .6; }
@media (max-width: 420px) {
  .app-shell { padding: 18px 12px 24px; }
  .step { padding: 16px; }
  .lesson-grid { grid-template-columns: 1fr; }
}