:root {
  color-scheme: light;
  --indigo: #6366f1;
  --indigo-700: #4338ca;
  --indigo-100: #e0e7ff;
  --teal: #14b8a6;
  --rose: #f43f5e;
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-600: #475569;
  --slate-900: #0f172a;
  --outline: #cbd5e1;
  --expected: #3b82f6;
  --conducted: #22c55e;
  --cancelled: #94a3b8;
  --paid: #f59e0b;
  --bg: #f1f5f9;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
}

html.theme-dark {
  color-scheme: dark;
  --bg: #0b1120;
  --surface: #151f32;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --outline: #334155;
  --indigo: #a5b4fc;
  --indigo-700: #c7d2fe;
  --indigo-100: #312e81;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  font-family: Manrope, system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-shell { display: grid; grid-template-columns: 240px 1fr; min-height: 100%; }
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--outline);
  padding: 20px 16px;
  position: sticky;
  top: 0;
  height: 100vh;
}
.brand { display: flex; gap: 12px; align-items: center; margin-bottom: 28px; }
.brand-mark {
  width: 42px; height: 42px; border-radius: 14px;
  background: linear-gradient(135deg, var(--indigo), var(--teal));
  color: white; display: grid; place-items: center; font-weight: 800;
}
.brand-title { font-weight: 800; font-size: 18px; }
.brand-sub { color: var(--muted); font-size: 12px; }
.nav { display: flex; flex-direction: column; gap: 6px; }
.nav a {
  text-decoration: none; color: var(--muted); padding: 10px 12px;
  border-radius: 12px; font-weight: 600;
}
.nav a.active, .nav a:hover { background: var(--indigo-100); color: var(--indigo-700); }

.content { padding: 24px 28px 48px; }
.page { max-width: 1180px; margin: 0 auto; display: grid; gap: 16px; }
.hero {
  background: linear-gradient(135deg, #4f46e5, #6366f1 45%, #14b8a6);
  color: white; border-radius: 20px; padding: 22px 24px;
}
.hero h1 { margin: 0; font-size: 28px; }
.hero p { margin: 6px 0 0; opacity: .9; }

.grid { display: grid; gap: 12px; }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.card {
  background: var(--surface); border: 1px solid var(--outline);
  border-radius: 16px; padding: 16px; box-shadow: var(--shadow);
}
.card.clickable { cursor: pointer; }
.card.clickable:hover { border-color: var(--indigo); }

.row { display: flex; gap: 12px; align-items: center; }
.space { justify-content: space-between; }
.muted { color: var(--muted); }
.stat { font-size: 28px; font-weight: 800; }
.section-title { font-weight: 700; font-size: 16px; margin: 8px 0; }

button, .btn, a.btn-primary, a.btn-outline, label.btn-outline {
  border: 0; border-radius: 12px; padding: 10px 14px; font-weight: 700;
  cursor: pointer; font-family: inherit; text-decoration: none; display: inline-block;
  text-align: center;
}
.btn-primary { background: var(--indigo); color: white; }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--outline); }
.btn-danger { background: #fee2e2; color: #be123c; }
.btn-ghost { background: transparent; color: var(--muted); }
button:disabled { opacity: .55; cursor: default; }

input, select, textarea {
  width: 100%; border: 1px solid var(--outline); border-radius: 12px;
  padding: 10px 12px; font-family: inherit; background: var(--surface); color: var(--text);
}
textarea { min-height: 80px; resize: vertical; }
label { display: grid; gap: 6px; font-size: 13px; font-weight: 600; color: var(--muted); }
.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  color: var(--text);
}
.check-row input { width: auto; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chip {
  border-radius: 999px; padding: 6px 10px; font-size: 12px; font-weight: 700;
  background: var(--indigo-100); color: var(--indigo-700);
}
.chip.expected { background: #dbeafe; color: #1d4ed8; }
.chip.conducted { background: #dcfce7; color: #15803d; }
.chip.cancelled { background: #e2e8f0; color: #475569; }
.chip.paid { background: #fef3c7; color: #b45309; }
.chip.active { outline: 2px solid var(--indigo); }

.avatar {
  width: 42px; height: 42px; border-radius: 50%; display: grid; place-items: center;
  font-weight: 800; background: #e0e7ff; color: #4338ca;
}

.lesson-card { display: grid; grid-template-columns: auto 1fr auto; gap: 12px; align-items: center; }
.actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}
.actions .chip {
  height: 36px;
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  line-height: 1;
  white-space: nowrap;
}
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  font-size: 16px;
  line-height: 1;
  flex-shrink: 0;
}
.btn-icon.ok { background: var(--indigo); color: white; }
.btn-icon.no {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--outline);
}
.btn-icon.no:hover { background: #fee2e2; color: #be123c; border-color: #fecaca; }
@media (max-width: 720px) {
  .lesson-card { grid-template-columns: auto 1fr; }
  .actions { grid-column: 1 / -1; justify-content: flex-end; }
}

.month-wrap {
  overflow: auto;
  max-height: calc(100vh - 220px);
  border: 1px solid var(--outline);
  border-radius: 16px;
  background: var(--surface);
}
.month-grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(120px, 1fr));
  min-width: 840px;
}
.month-head {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 10px 8px;
  text-align: center;
  font-weight: 700;
  font-size: 13px;
  color: var(--muted);
  background: var(--surface);
  border-bottom: 1px solid var(--outline);
}
.month-cell {
  min-height: 128px;
  padding: 8px;
  border-right: 1px solid var(--outline);
  border-bottom: 1px solid var(--outline);
  display: flex;
  flex-direction: column;
  gap: 4px;
  background: var(--surface);
}
.month-cell.empty { background: transparent; opacity: .45; }
.month-cell.weekend { background: color-mix(in srgb, var(--bg) 55%, var(--surface)); }
.month-cell.today { box-shadow: inset 0 0 0 2px var(--indigo); }
.month-num {
  font-weight: 800;
  font-size: 13px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
}
.month-cell.today .month-num { background: var(--indigo); color: white; }
.month-list { display: grid; gap: 3px; }
.month-item {
  display: grid;
  grid-template-columns: 40px 1fr auto;
  gap: 4px;
  align-items: center;
  width: 100%;
  margin: 0;
  border: 0;
  border-radius: 6px;
  padding: 3px 6px;
  font: inherit;
  font-size: 11px;
  line-height: 1.2;
  text-align: left;
  cursor: pointer;
  background: #dbeafe;
  color: #1d4ed8;
  min-width: 0;
}
.month-item.conducted { background: #dcfce7; color: #15803d; }
.month-item.cancelled { background: #e2e8f0; color: #475569; }
html.theme-dark .month-item { background: #1e3a5f; color: #93c5fd; }
html.theme-dark .month-item.conducted { background: #14532d; color: #86efac; }
html.theme-dark .month-item.cancelled { background: #334155; color: #cbd5e1; }
.month-time { font-variant-numeric: tabular-nums; font-weight: 700; opacity: .85; }
.month-who { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.month-subj { font-weight: 600; opacity: .75; white-space: nowrap; }
.month-more { font-size: 11px; font-weight: 700; color: var(--muted); padding: 0 6px; }
.hour-wrap {
  overflow: auto;
  max-height: calc(100vh - 220px);
  border: 1px solid var(--outline);
  border-radius: 16px;
  background: var(--surface);
}
.hour-grid { display: grid; grid-template-columns: 64px repeat(7, minmax(0, 1fr)); }
.hour-grid.days-1 { grid-template-columns: 64px minmax(0, 1fr); }
.week-board {
  display: grid;
  grid-template-columns: 64px repeat(7, minmax(0, 1fr));
  grid-template-rows: 40px auto;
}
.week-board.days-1 { grid-template-columns: 64px minmax(0, 1fr); }
.hour-corner,
.hour-head {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--surface);
}
.hour-corner {
  z-index: 6;
  left: 0;
  border-right: 1px solid var(--outline);
  border-bottom: 1px solid var(--outline);
}
.hour-head {
  padding: 10px 8px;
  text-align: center;
  font-weight: 700;
  font-size: 13px;
  border-left: 1px solid var(--outline);
  border-bottom: 1px solid var(--outline);
}
.hour-head.today { color: var(--indigo); background: var(--indigo-100); }
.time-col {
  position: sticky;
  left: 0;
  z-index: 3;
  background: var(--surface);
  border-right: 1px solid var(--outline);
}
.hour-label {
  height: 56px;
  color: var(--muted);
  font-size: 12px;
  padding: 6px 8px 0 0;
  text-align: right;
  box-sizing: border-box;
  border-top: 1px solid var(--outline);
}
.day-col {
  min-width: 0;
  border-left: 1px solid var(--outline);
}
.day-track { position: relative; overflow: hidden; }
.hour-line {
  position: absolute;
  left: 0;
  right: 0;
  height: 56px;
  box-sizing: border-box;
  border-top: 1px solid var(--outline);
  pointer-events: none;
}
.hour-event {
  position: absolute;
  box-sizing: border-box;
  min-width: 0;
  margin: 0;
  border: 0;
  border-radius: 8px;
  padding: 4px 6px;
  font: inherit;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 1px;
  text-align: left;
  overflow: hidden;
  z-index: 1;
  max-width: 100%;
  white-space: nowrap;
  background: #dbeafe;
  color: #1d4ed8;
}
.hour-event small {
  font-weight: 600;
  font-size: 11px;
  opacity: .8;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}
.cal-item { cursor: pointer; }
.cal-subject { font-weight: 600; }
.hour-event.conducted { background: #dcfce7; color: #15803d; }
.hour-event.cancelled { background: #e2e8f0; color: #475569; }
html.theme-dark .hour-event { background: #1e3a5f; color: #93c5fd; }
html.theme-dark .hour-event.conducted { background: #14532d; color: #86efac; }
html.theme-dark .hour-event.cancelled { background: #334155; color: #cbd5e1; }

.day-agenda { display: grid; gap: 10px; }
.day-agenda h3 { margin: 0; font-size: 20px; }
.day-event {
  width: 100%;
  display: grid;
  grid-template-columns: 72px 1fr auto;
  gap: 12px;
  align-items: center;
  text-align: left;
  border: 1px solid var(--outline);
  background: var(--surface);
  color: var(--text);
  border-radius: 16px;
  padding: 14px 16px;
  cursor: pointer;
  font: inherit;
  box-shadow: var(--shadow);
}
.day-event:hover { border-color: var(--indigo); }
.day-event-time { display: grid; gap: 2px; font-variant-numeric: tabular-nums; }
.day-event-time b { font-size: 18px; }
.day-event-body { min-width: 0; }
.day-event-flags { display: flex; gap: 6px; flex-wrap: wrap; justify-content: flex-end; }
.day-event.conducted { border-left: 4px solid #22c55e; }
.day-event.cancelled { border-left: 4px solid #94a3b8; opacity: .72; }
.day-event.expected { border-left: 4px solid #3b82f6; }
@media (max-width: 640px) {
  .day-event { grid-template-columns: 64px 1fr; }
  .day-event-flags { grid-column: 2; justify-content: flex-start; }
}

.modal-backdrop {
  position: fixed; inset: 0; background: rgba(15, 23, 42, .45);
  display: grid; place-items: center; z-index: 30; padding: 20px;
}
.modal { background: var(--surface); border-radius: 20px; width: min(640px, 100%); padding: 20px; max-height: 90vh; overflow: auto; }
.toast {
  position: sticky; top: 8px; z-index: 20; background: #0f172a; color: white;
  padding: 10px 14px; border-radius: 12px; width: fit-content; margin-bottom: 12px;
}
.hidden { display: none !important; }
.empty { padding: 32px; text-align: center; color: var(--muted); }

.week-bar { display: flex; gap: 8px; align-items: center; }
.toolbar { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

@media (max-width: 900px) {
  .app-shell { grid-template-columns: 1fr; }
  .sidebar { height: auto; position: static; }
  .nav { flex-direction: row; overflow: auto; }
  .grid.cols-3, .grid.cols-2 { grid-template-columns: 1fr; }
}

.login-body {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: 24px;
  background:
    radial-gradient(circle at top left, #c7d2fe 0, transparent 40%),
    var(--bg);
}
.login-card {
  width: min(420px, 100%);
  background: var(--surface);
  border: 1px solid var(--outline);
  border-radius: 24px;
  padding: 28px 24px;
  box-shadow: var(--shadow);
}
.login-form { display: grid; gap: 14px; margin-top: 18px; }
.login-form .btn-primary { width: 100%; }
.login-error {
  margin-top: 16px;
  background: #fee2e2;
  color: #be123c;
  border-radius: 12px;
  padding: 10px 12px;
  font-weight: 600;
}
.login-hint { margin: 16px 0 0; font-size: 13px; }