:root {
  color-scheme: light dark;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  --accent: #1266f1;
  --border: rgba(0, 0, 0, 0.15);
  --bg: #f4f6fb;
  --card: #fff;
  --text: #111;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
}

.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

h1 {
  margin-bottom: 0.25rem;
}

.controls-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.field-group {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

label {
  font-weight: 600;
}

select,
input[type="date"] {
  padding: 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  background: #fff;
}

button {
  align-self: flex-start;
  background: var(--accent);
  border: none;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  cursor: pointer;
  transition: opacity 0.2s ease;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.repeat-field {
  margin-top: 0.5rem;
}

button.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.table-wrapper {
  overflow-x: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
}

table {
  width: 100%;
  border-collapse: collapse;
}

thead {
  background: rgba(0, 0, 0, 0.04);
}

th,
td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border);
  text-align: left;
}

tbody tr:hover {
  background: rgba(18, 102, 241, 0.08);
}

#status {
  min-height: 1.5rem;
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.calendar-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: stretch;
}

.calendar-month {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
  overflow: hidden;
  width: 100%;
  max-width: 700px;
  margin: 0 auto;
}

.calendar-month h3 {
  margin: 0;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.04);
}

.calendar-table th {
  width: 14.285%;
  border: 1px solid rgba(0, 0, 0, 0.06);
  text-align: center;
  font-weight: 600;
  background: rgba(0, 0, 0, 0.03);
  padding: 0.35rem;
  font-size: 0.85rem;
}

.calendar-table td {
  width: 14.285%;
  border: 1px solid rgba(0, 0, 0, 0.06);
  min-height: 130px;
  padding: 1.4rem 0.4rem 0.4rem;
  font-size: 0.85rem;
  vertical-align: top;
  position: relative;
}

.calendar-day-number {
  position: absolute;
  top: 0.4rem;
  left: 0.45rem;
  font-weight: 700;
  font-size: 0.9rem;
}

.calendar-cell {
  border-radius: 10px;
  padding: 0.35rem;
  width: 100%;
  min-height: 80px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 0.25rem;
  border: 1px solid transparent;
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
}

.calendar-cell--holiday {
  border: 2px solid rgba(234, 179, 8, 0.9);
  box-shadow: 0 0 8px rgba(234, 179, 8, 0.4);
}

.calendar-cell--day {
  background: rgba(72, 187, 120, 0.2);
  color: #0f6b3c;
}

.calendar-cell--night {
  background: rgba(59, 130, 246, 0.2);
  color: #1d4ed8;
}

.calendar-cell--off {
  background: rgba(156, 163, 175, 0.25);
  color: #374151;
}

.calendar-cell--empty {
  background: rgba(0, 0, 0, 0.02);
  color: #6b7280;
  border: 1px dashed rgba(0, 0, 0, 0.08);
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: #666;
  border-radius: 12px;
  background: var(--card);
  border: 1px dashed var(--border);
}

@media (max-width: 600px) {
  .controls-card {
    padding: 1rem;
  }

  .calendar-grid {
    gap: 1rem;
    align-items: center;
  }

  .calendar-month {
    max-width: 100%;
    margin: 0;
  }

  .calendar-table th {
    font-size: 0.65rem;
    padding: 0.25rem;
  }

  .calendar-table td {
    min-height: 90px;
    padding: 1.1rem 0.35rem 0.25rem;
    font-size: 0.7rem;
  }

  .calendar-day-number {
    font-size: 0.75rem;
  }

  .calendar-cell {
    min-height: 60px;
    font-size: 0.7rem;
  }

  .calendar-shift-label {
    font-size: 0.8rem;
  }
}