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

:root {
  --primary: #e86c25;
  --primary-dark: #d35a15;
  --success: #16a34a;
  --danger: #dc2626;
  --warning: #f59e0b;
  --bg: #f1f5f9;
  --card: #ffffff;
  --text: #1e293b;
  --text-light: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* === NAVBAR === */
.navbar {
  background: linear-gradient(135deg, #e86c25, #f5a623);
  color: white;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-lg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.navbar .logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.navbar nav { display: flex; gap: 4px; }

.navbar nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.navbar nav a:hover, .navbar nav a.active {
  background: rgba(255,255,255,0.2);
  color: white;
}

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

.page-title {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 24px;
  color: var(--text);
}

/* === CARDS === */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* === GRID === */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .navbar { flex-direction: column; height: auto; padding: 12px; gap: 8px; }
  .navbar nav { flex-wrap: wrap; justify-content: center; }
}

/* === STATS === */
.stat-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  text-align: center;
}

.stat-card .stat-value {
  font-size: 32px;
  font-weight: 700;
  color: var(--primary);
}

.stat-card .stat-label {
  font-size: 13px;
  color: var(--text-light);
  margin-top: 4px;
}

/* === FORMS === */
.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-light);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--bg);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #15803d; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-warning { background: var(--warning); color: white; }
.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover { background: var(--primary); color: white; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-lg { padding: 14px 28px; font-size: 16px; }

/* === TABLE === */
.table-wrap { overflow-x: auto; max-height: 75vh; overflow-y: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

table th {
  background: var(--bg);
  padding: 12px 16px;
  text-align: left;
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-light);
  border-bottom: 2px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

table thead tr:nth-child(2) th {
  top: 38px;
}

/* Freeze columns: checkbox, STT, Ma NV, Ho Ten */
table td:nth-child(1), table th:nth-child(1) { position: sticky; left: 0; z-index: 5; background: #fff; }
table td:nth-child(2), table th:nth-child(2) { position: sticky; left: 40px; z-index: 5; background: #fff; }
table td:nth-child(3), table th:nth-child(3) { position: sticky; left: 80px; z-index: 5; background: #fff; }
table td:nth-child(4), table th:nth-child(4) { position: sticky; left: 160px; z-index: 5; background: #fff; min-width: 120px; }
table th:nth-child(1), table th:nth-child(2), table th:nth-child(3), table th:nth-child(4) { z-index: 15; background: var(--bg); }

table td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

table tr:hover { background: #f8fafc; }

/* === CAMERA === */
.camera-container {
  position: relative;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
}

.camera-container video {
  width: 100%;
  display: block;
  transform: scaleX(-1);
}

.camera-container canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transform: scaleX(-1);
}

.camera-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(transparent, rgba(0,0,0,0.7));
  color: white;
  text-align: center;
}

/* === STATUS === */
.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
}

.status-success { background: #dcfce7; color: #166534; }
.status-danger { background: #fef2f2; color: #991b1b; }
.status-warning { background: #fef9c3; color: #854d0e; }
.status-info { background: #fff3e0; color: #bf5a0a; }

/* === MODAL === */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  background: var(--card);
  border-radius: var(--radius);
  padding: 24px;
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  transform: translateY(20px);
  transition: transform 0.2s;
}

.modal-backdrop.active .modal {
  transform: translateY(0);
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* === ATTENDANCE PAGE === */
.attendance-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 20px;
  flex-wrap: wrap;
}

.recognition-result {
  text-align: center;
  padding: 20px;
  margin-top: 16px;
}

.recognition-result .name {
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
}

.recognition-result .code {
  font-size: 14px;
  color: var(--text-light);
}

/* === WIFI STATUS === */
.wifi-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
}

.wifi-ok { background: #dcfce7; color: #166534; }
.wifi-fail { background: #fef2f2; color: #991b1b; }

/* === TOAST === */
.toast-container {
  position: fixed;
  top: 80px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 14px 20px;
  border-radius: 8px;
  color: white;
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }
.toast-info { background: var(--primary); }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(232,108,37,0.4); }
  50% { box-shadow: 0 0 0 8px rgba(232,108,37,0); }
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

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

.tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-light);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

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

.tab-content { display: none; }
.tab-content.active { display: block; }

/* === LOADING === */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
  color: var(--text-light);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  margin-right: 12px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* === FACE CAPTURE === */
.face-samples {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin: 16px 0;
}

.face-sample {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  object-fit: cover;
  border: 2px solid var(--success);
}

.face-sample-placeholder {
  width: 80px;
  height: 80px;
  border-radius: 8px;
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: 12px;
}

/* === SALARY TABLE === */
.salary-total {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

.salary-highlight {
  background: #eff6ff;
  font-weight: 600;
}

/* Print styles */
@media print {
  .navbar, .btn, .no-print { display: none !important; }
  .card { box-shadow: none; border: 1px solid #ddd; }
  body { background: white; }
}