:root {
  /* Modern Light Palette - Indigo & Zinc */
  --primary: #4f46e5;         /* Indigo-600 */
  --primary-hover: #4338ca;   /* Indigo-700 */
  --primary-light: rgba(79, 70, 229, 0.1);
  
  --text-main: #18181b;       /* Zinc-900 */
  --text-secondary: #71717a;  /* Zinc-500 */
  
  --bg-body: #f4f4f5;         /* Zinc-100 */
  --bg-surface: #ffffff;
  --bg-highlight: #f4f4f5;    /* Zinc-100 */
  --border-color: #e4e4e7;    /* Zinc-200 */
  
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;

  /* Status Colors - Modern Light Mode */
  --color-holiday: #ffe4e6;        /* Rose-100 */
  --color-holiday-text: #be123c;   /* Rose-700 */
  
  --color-weekend: #f3f4f6;        /* Gray-100 */
  --color-weekend-text: #4b5563;   /* Gray-600 */
  
  --color-makeup: #fef3c7;         /* Amber-100 */
  --color-makeup-text: #b45309;    /* Amber-700 */
  
  --status-rest-bg: #dcfce7;       /* Emerald-100 */
  --status-rest-text: #15803d;     /* Emerald-700 */
  
  --status-duty-bg: #dbeafe;       /* Blue-100 */
  --status-duty-text: #1d4ed8;     /* Blue-700 */
  
  --status-oncall-bg: #ffedd5;     /* Orange-100 */
  --status-oncall-text: #c2410c;   /* Orange-700 */
}

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

body {
  margin: 0;
  padding: 0;
  background: var(--bg-body);
  color: var(--text-main);
  font-family: system-ui, -apple-system, sans-serif;
  line-height: 1.5;
  height: 100vh;
  overflow: hidden;
}

/* Layout */
.app-container {
  display: flex;
  height: 100%;
  width: 100%;
}

.sidebar {
  width: 320px;
  flex-shrink: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.content-area {
  flex: 1;
  overflow: hidden;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
}

/* Sidebar Components */
.sidebar-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  color: var(--text-main);
}

.sidebar-header .lead {
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin: 0;
  text-indent: 2em;
}

.sidebar-header a {
  color: var(--primary);
  text-decoration: none;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.form-group label span {
  display: flex;
  justify-content: space-between;
}

select, input[type="number"] {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: var(--bg-body);
  color: var(--text-main);
  font-size: 0.95rem;
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
}

select:focus, input:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px var(--primary-light);
}

/* Custom Select Arrow for Light Mode */
select {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
  background-position: right 0.5rem center;
  background-repeat: no-repeat;
  background-size: 1.5em 1.5em;
  padding-right: 2.5rem;
}

input[type="range"] {
  width: 100%;
  height: 6px;
  background: var(--bg-highlight);
  border-radius: var(--radius-full);
  outline: none;
  -webkit-appearance: none;
  margin-top: 0.5rem;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: var(--primary);
  border-radius: 50%;
  cursor: pointer;
}

.btn-block {
  width: 100%;
  padding: 0.75rem;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: background 0.2s;
}

.btn-block:hover {
  background: var(--primary-hover);
}

/* Legend in Sidebar */
.legend-title {
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text-main);
}

.legend-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.legend-grid span {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.swatch {
  width: 0.75rem;
  height: 0.75rem;
  border-radius: 3px;
  flex-shrink: 0;
}

/* Main Content */
.panel.schedule-panel {
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
}

.schedule-wrapper {
  flex: 1;
  overflow: auto;
  position: relative;
  border-top: 1px solid var(--border-color);
}

.table-title-bar {
  padding: 1rem 1.5rem;
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border-color);
}

#table-title-input {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  outline: none;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  border: 1px solid transparent;
  background: transparent;
}

#table-title-input:hover {
  background: var(--bg-highlight);
}

#table-title-input:focus {
  background: var(--bg-body);
  border-color: var(--primary);
}

/* Table */
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}

th, td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  text-align: center;
  white-space: nowrap;
  font-size: 0.9rem;
}

thead th {
  background: var(--bg-highlight);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.8rem;
  position: sticky;
  top: 0; 
  z-index: 30;
}

/* Fixed Columns */
td[data-role="name"], th:first-child {
  position: sticky;
  left: 0;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  z-index: 20;
}

thead th:first-child {
  background: var(--bg-highlight); /* Ensure header corner matches header row */
  z-index: 35; 
}

/* States & Colors */
td.holiday { background-color: var(--color-holiday); color: var(--color-holiday-text); }
td.weekend { background-color: var(--color-weekend); color: var(--color-weekend-text); }
td.makeup-day { background-color: var(--color-makeup); color: var(--color-makeup-text); }

td.status-rest { background-color: var(--status-rest-bg) !important; color: var(--status-rest-text); font-weight: 600; }
td.status-duty { background-color: var(--status-duty-bg) !important; color: var(--status-duty-text); font-weight: 600; }
td.status-oncall { background-color: var(--status-oncall-bg) !important; color: var(--status-oncall-text); font-weight: 600; }

/* Cell Interactions */
td:not([data-role="name"]) {
  cursor: pointer;
  transition: filter 0.1s;
}

td:not([data-role="name"]):hover {
  filter: brightness(1.2); /* Lighten on hover for dark mode */
}

caption {
  padding: 1rem;
  color: var(--text-secondary);
  text-align: left;
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
  background: var(--bg-highlight);
  position: sticky;
  bottom: 0;
  left: 0;
}

/* Actions */
.action-row {
  padding: 1rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border-color);
  display: flex;
  gap: 1rem;
  justify-content: flex-end;
}

button[data-variant="ghost"] {
  background: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s;
}

button[data-variant="ghost"]:hover {
  background: var(--bg-highlight);
  color: var(--text-main);
  border-color: var(--text-secondary);
}

/* Mobile */
@media (max-width: 768px) {
  body {
    height: auto;
    overflow: auto;
  }

  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    overflow: visible;
  }

  .content-area {
    height: auto;
    overflow: visible;
    padding: 1rem;
  }
  
  .panel.schedule-panel {
    height: auto;
    overflow: visible;
  }
  
  .schedule-wrapper {
    overflow-x: auto;
  }
  
  .table-title-bar, thead th {
    position: static; 
  }
}