*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, sans-serif;
  font-size: 14px;
  color: #1a1a1a;
  background: #f5f5f5;
}

header { background: #2563eb; color: white; padding: 16px 24px; }
header h1 { font-size: 18px; font-weight: 600; }

.tabs { display: flex; gap: 2px; background: #e5e7eb; padding: 8px 24px 0; }
.tab-btn {
  padding: 8px 20px; border: none; background: #d1d5db;
  cursor: pointer; border-radius: 6px 6px 0 0; font-size: 14px; color: #374151;
}
.tab-btn.active { background: white; color: #2563eb; font-weight: 600; }
.tab-content { background: white; min-height: calc(100vh - 100px); padding: 24px; }
.hidden { display: none; }

button {
  cursor: pointer; padding: 6px 14px; border-radius: 4px;
  border: 1px solid #d1d5db; background: white; font-size: 13px;
}
button.primary { background: #2563eb; color: white; border-color: #2563eb; }
button.danger { background: #ef4444; color: white; border-color: #ef4444; }
input, select { padding: 5px 8px; border: 1px solid #d1d5db; border-radius: 4px; font-size: 13px; }

table { border-collapse: collapse; width: 100%; }
th, td { text-align: left; padding: 8px 12px; border-bottom: 1px solid #e5e7eb; }
th { background: #f9fafb; font-weight: 600; }

.section-title { font-size: 16px; font-weight: 600; margin-bottom: 16px; }
.row { display: flex; gap: 8px; align-items: center; margin-bottom: 12px; flex-wrap: wrap; }

.calendar-outer { overflow-x: auto; }
.calendar-header-grid { display: grid; grid-template-columns: repeat(7,1fr); gap: 6px; margin-bottom: 6px; }
.calendar-body-grid { display: grid; grid-template-columns: repeat(7,1fr); gap: 6px; }
.cal-day { border: 1px solid #e5e7eb; border-radius: 6px; padding: 8px; background: white; min-height: 80px; }
.cal-day.weekend { background: #f3f4f6; color: #9ca3af; }
.cal-day.holiday { background: #fef3c7; }
.cal-day.closure { background: #fee2e2; }
.cal-day.empty-cell { border: none; background: transparent; min-height: 0; }
.day-num { font-weight: 600; font-size: 13px; }
.day-tag { font-size: 10px; color: #6b7280; }

.employee-item { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-bottom: 1px solid #f3f4f6; }
.employee-name { font-weight: 500; flex: 1; }
.constraint-form { background: #f9fafb; padding: 16px; border-radius: 8px; margin-top: 4px; margin-bottom: 8px; }
.constraint-form label { display: block; margin-bottom: 4px; font-size: 12px; color: #6b7280; }
.constraint-row { margin-bottom: 12px; }
.day-toggle-group { display: flex; gap: 4px; }
.day-toggle {
  width: 32px; height: 32px; border-radius: 50%; border: 1px solid #d1d5db;
  background: white; font-size: 11px; cursor: pointer;
}
.day-toggle.active { background: #2563eb; color: white; border-color: #2563eb; }