:root {
  --bg: #f8f9fa;
  --card-bg: #ffffff;
  --primary: #0078d4;
  --primary-hover: #106ebe;
  --success: #107c10;
  --danger: #d13438;
  --warning: #ffb900;
  --text: #323130;
  --text-light: #605e5c;
  --border: #edebe9;
  --radius: 6px;
}

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

body {
  font-family: 'Segoe UI', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* --- Layout --- */
.app-header {
  background: var(--primary);
  color: white;
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.app-header h1 { font-size: 18px; font-weight: 600; }
.app-header .user-info { font-size: 13px; opacity: 0.9; }
.app-header a { color: white; margin-left: 16px; font-size: 13px; }

.container { max-width: 1200px; margin: 0 auto; padding: 24px; }

/* --- Toolbar --- */
.toolbar {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  align-items: center;
}

.toolbar input[type="text"] {
  flex: 1;
  min-width: 200px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
}

.toolbar select {
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  background: white;
}

/* --- Table --- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--card-bg);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.data-table th {
  background: #faf9f8;
  padding: 10px 14px;
  text-align: left;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  user-select: none;
}

.data-table th:hover { background: #f3f2f1; }

.data-table td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.data-table tr:hover { background: #f3f2f1; cursor: pointer; }
.data-table tr:last-child td { border-bottom: none; }

/* --- Status badges --- */
.badge {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
}

.badge-pending { background: #fff4ce; color: #835c00; }
.badge-approved { background: #dff6dd; color: #0b6a0b; }
.badge-rejected { background: #fde7e9; color: #a80000; }
.badge-merged { background: #deecf9; color: #004578; }

/* --- Buttons --- */
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-hover); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #0e6b0e; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b52e31; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}
.btn-outline:hover { background: #f3f2f1; }

/* --- Modal / Detail Panel --- */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 1000;
  justify-content: center;
  align-items: flex-start;
  padding-top: 40px;
}

.modal-overlay.active { display: flex; }

.modal {
  background: var(--card-bg);
  border-radius: 8px;
  width: 90%;
  max-width: 800px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}

.modal-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h2 { font-size: 18px; }

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-light);
  padding: 4px 8px;
}

.modal-body { padding: 24px; }

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 8px;
  justify-content: flex-end;
}

/* --- Form fields --- */
.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: inherit;
}

.form-group textarea { min-height: 100px; resize: vertical; }

.form-group input:disabled,
.form-group textarea:disabled,
.form-group select:disabled {
  background: #faf9f8;
  color: var(--text-light);
}

/* --- Stats bar --- */
.stats-bar {
  display: flex;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.stat-card {
  background: var(--card-bg);
  padding: 14px 20px;
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  min-width: 120px;
}

.stat-card .stat-value { font-size: 24px; font-weight: 700; }
.stat-card .stat-label { font-size: 12px; color: var(--text-light); }

/* --- Empty state --- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-light);
}

.empty-state h3 { margin-bottom: 8px; }

/* --- Toast notifications --- */
.toast {
  position: fixed;
  bottom: 20px;
  right: 20px;
  padding: 12px 20px;
  border-radius: var(--radius);
  color: white;
  font-weight: 600;
  z-index: 2000;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
}

.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* --- Loading --- */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--text-light);
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 10px 20px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-light);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.15s;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--primary); border-bottom-color: var(--primary); }