:root {
  color-scheme: light;
  --ink: #1d2433;
  --muted: #718096;
  --bg: #f3f6fb;
  --panel: #ffffff;
  --line: #e7ebf3;
  --accent: #2164e8;
  --accent-soft: #e9f0ff;
  --danger: #b42318;
  --danger-soft: #fff1f0;
  --cancel: #d9ead3;
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; }
button, select { font: inherit; }
.app-shell { max-width: 760px; margin: 0 auto; padding: 24px 16px 48px; }
.hero { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.eyebrow { margin: 0 0 4px; color: var(--accent); font-weight: 700; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
h1 { margin: 0; font-size: clamp(28px, 8vw, 42px); letter-spacing: -.04em; }
.muted { color: var(--muted); margin: 5px 0 0; }
.badge { background: var(--accent-soft); color: var(--accent); border-radius: 999px; padding: 8px 12px; font-weight: 700; white-space: nowrap; }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 20px; padding: 18px; box-shadow: 0 10px 30px rgba(32, 53, 88, .06); }
.field-group + .field-group { margin-top: 16px; }
label { display: block; font-size: 12px; font-weight: 800; color: var(--muted); text-transform: uppercase; letter-spacing: .07em; margin-bottom: 8px; }
.segmented, .view-switcher, .week-switcher { display: flex; gap: 8px; overflow-x: auto; }
.segmented button, .view-switcher button, .week-switcher button { border: 1px solid var(--line); background: #fff; color: var(--ink); border-radius: 12px; padding: 10px 13px; cursor: pointer; white-space: nowrap; }
.segmented button.active, .view-switcher button.active, .week-switcher button.active { background: var(--accent); color: #fff; border-color: var(--accent); }
.view-switcher { margin: 20px 0 10px; padding: 4px; background: var(--accent-soft); border-radius: 16px; }
.view-switcher button { flex: 1; padding: 12px 15px; font-weight: 800; }
.week-switcher { margin: 10px 0 12px; }
select { width: 100%; border: 1px solid var(--line); border-radius: 12px; padding: 12px 13px; background: #fff; color: var(--ink); }
.actions { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 18px; }
.primary { border: 0; background: var(--ink); color: #fff; border-radius: 12px; padding: 12px 16px; cursor: pointer; font-weight: 700; }
.primary:disabled { opacity: .6; cursor: wait; }
.status { color: #20744a; font-size: 13px; }
.schedule-grid { display: grid; gap: 12px; }
.day-card { background: var(--panel); border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.day-header { display: flex; justify-content: space-between; gap: 12px; padding: 13px 15px; background: #fbfcff; border-bottom: 1px solid var(--line); font-weight: 800; }
.lesson { display: grid; grid-template-columns: 64px 1fr auto; gap: 12px; align-items: start; padding: 13px 15px; border-bottom: 1px solid var(--line); }
.lesson:last-child { border-bottom: 0; }
.lesson.cancelled { background: var(--cancel); color: #3c513a; }
.lesson-time { color: var(--muted); font-size: 12px; }
.lesson-subject { font-weight: 750; }
.lesson-meta { color: var(--muted); font-size: 12px; margin-top: 2px; }
.cancel-tag { color: var(--danger); background: var(--danger-soft); border-radius: 999px; padding: 4px 7px; font-size: 11px; font-weight: 800; white-space: nowrap; }
.empty-day { padding: 14px 15px; color: var(--muted); }
.hidden { display: none !important; }
@media (max-width: 500px) { .lesson { grid-template-columns: 1fr auto; } .lesson-time { grid-column: 1 / -1; } }