:root {
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  --bg-page: #f8fafc;
  --bg-card: #ffffff;
  --border-color: #e2e8f0;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.08);

  /* Status Colors */
  --status-present: #10b981;
  --status-present-bg: #ecfdf5;
  --status-present-border: #a7f3d0;
  --status-present-text: #065f46;

  --status-absent: #ef4444;
  --status-absent-bg: #fef2f2;
  --status-absent-border: #fecaca;
  --status-absent-text: #991b1b;

  --status-leave: #f59e0b;
  --status-leave-bg: #fffbeb;
  --status-leave-border: #fde68a;
  --status-leave-text: #92400e;

  --status-late: #8b5cf6;
  --status-late-bg: #f5f3ff;
  --status-late-border: #ddd6fe;
  --status-late-text: #5b21b6;

  --status-activity: #0284c7;
  --status-activity-bg: #f0f9ff;
  --status-activity-border: #bae6fd;
  --status-activity-text: #075985;
}

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

body {
  font-family: 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background-color: var(--bg-page);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
  padding-bottom: 80px;
}

/* Header & Nav */
.header {
  background: #ffffff;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 40;
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 12px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #2563eb, #3b82f6);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  box-shadow: 0 2px 5px rgba(37, 99, 235, 0.3);
}

.brand-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #1e3a8a;
  letter-spacing: -0.01em;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 6px;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-md);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.nav-link:hover {
  color: var(--primary);
  background-color: var(--primary-light);
}

.nav-link.active {
  color: var(--primary);
  background-color: var(--primary-light);
  font-weight: 600;
}

/* Container */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 16px;
}

/* Page Title & Controls */
.page-header {
  margin-bottom: 16px;
}

.page-title {
  font-size: 1.35rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 4px;
}

.page-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Controls Bar (Room & Date) */
.filter-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 16px;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: #475569;
  display: flex;
  align-items: center;
  gap: 4px;
}

.form-control {
  font-family: inherit;
  font-size: 0.95rem;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #fff;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Notice / Status Alert */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  border: 1px solid transparent;
}

.alert-info {
  background-color: #eff6ff;
  border-color: #bfdbfe;
  color: #1e40af;
}

.alert-success {
  background-color: #ecfdf5;
  border-color: #a7f3d0;
  color: #065f46;
}

.alert-warning {
  background-color: #fffbeb;
  border-color: #fde68a;
  color: #92400e;
}

/* Summary Stats Counter Bar */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 10px;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
}

.stat-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.1s;
}

.stat-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 2px;
}

.stat-value {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.2;
}

.stat-box.all .stat-value { color: #1e293b; }
.stat-box.present { background: var(--status-present-bg); border-color: var(--status-present-border); }
.stat-box.present .stat-value { color: var(--status-present-text); }
.stat-box.absent { background: var(--status-absent-bg); border-color: var(--status-absent-border); }
.stat-box.absent .stat-value { color: var(--status-absent-text); }
.stat-box.leave { background: var(--status-leave-bg); border-color: var(--status-leave-border); }
.stat-box.leave .stat-value { color: var(--status-leave-text); }
.stat-box.late { background: var(--status-late-bg); border-color: var(--status-late-border); }
.stat-box.late .stat-value { color: var(--status-late-text); }
.stat-box.activity { background: var(--status-activity-bg); border-color: var(--status-activity-border); }
.stat-box.activity .stat-value { color: var(--status-activity-text); }

/* Quick Action Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.search-input-wrap {
  position: relative;
  flex: 1;
  min-width: 200px;
}

.search-input {
  width: 100%;
  padding: 9px 12px 9px 36px;
  font-size: 0.88rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background-color: #fff;
  outline: none;
}

.search-input-wrap .search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: #94a3b8;
  pointer-events: none;
}

.quick-btns {
  display: flex;
  gap: 8px;
}

.btn {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--primary);
  color: #fff;
}
.btn-primary:hover {
  background-color: var(--primary-hover);
}

.btn-secondary {
  background-color: #f1f5f9;
  border-color: #cbd5e1;
  color: #334155;
}
.btn-secondary:hover {
  background-color: #e2e8f0;
}

.btn-success {
  background-color: #10b981;
  color: #fff;
}
.btn-success:hover {
  background-color: #059669;
}

.btn-sm {
  padding: 6px 10px;
  font-size: 0.8rem;
}

/* Student Attendance List */
.student-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.student-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: all 0.15s ease;
}

.student-card:hover {
  border-color: #cbd5e1;
  box-shadow: var(--shadow-md);
}

.student-info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.student-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.seat-badge {
  background-color: #f1f5f9;
  color: #334155;
  font-size: 0.8rem;
  font-weight: 700;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  min-width: 38px;
  text-align: center;
}

.student-code {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: monospace;
}

.student-name {
  font-size: 0.98rem;
  font-weight: 600;
  color: #0f172a;
}

/* 5-Button Segmented Status Controller */
.status-buttons {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 6px;
}

@media (max-width: 580px) {
  .status-buttons {
    gap: 4px;
  }
}

.btn-status {
  font-family: inherit;
  border: 1px solid var(--border-color);
  background: #ffffff;
  padding: 8px 4px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 0.12s ease;
  min-height: 44px;
}

.btn-status:active {
  transform: scale(0.97);
}

.btn-status .status-icon {
  font-size: 0.9rem;
}

/* Active Status Button Styles */
.btn-status.present.active {
  background-color: var(--status-present);
  border-color: var(--status-present);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.btn-status.absent.active {
  background-color: var(--status-absent);
  border-color: var(--status-absent);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(239, 68, 68, 0.3);
}

.btn-status.leave.active {
  background-color: var(--status-leave);
  border-color: var(--status-leave);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(245, 158, 11, 0.3);
}

.btn-status.late.active {
  background-color: var(--status-late);
  border-color: var(--status-late);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(139, 92, 246, 0.3);
}

.btn-status.activity.active {
  background-color: var(--status-activity);
  border-color: var(--status-activity);
  color: #ffffff;
  box-shadow: 0 2px 4px rgba(2, 132, 199, 0.3);
}

/* Remark / Note inside student card */
.student-remark-row {
  margin-top: 2px;
}

.student-remark-input {
  width: 100%;
  font-family: inherit;
  font-size: 0.8rem;
  padding: 6px 10px;
  border: 1px dashed var(--border-color);
  border-radius: var(--radius-sm);
  background-color: #fafafa;
  color: #475569;
  outline: none;
}

.student-remark-input:focus {
  border-style: solid;
  border-color: var(--primary);
  background-color: #fff;
}

/* Sticky Bottom Action Bar */
.sticky-bottom-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  padding: 10px 16px;
  z-index: 50;
  box-shadow: 0 -4px 10px rgba(0, 0, 0, 0.05);
}

.sticky-content {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.sticky-summary {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.sticky-summary .badge {
  font-weight: 700;
  color: var(--primary);
}

.btn-save-sticky {
  font-size: 1rem;
  padding: 10px 24px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Status Badges */
.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 600;
}

.badge-status.present { background: var(--status-present-bg); color: var(--status-present-text); border: 1px solid var(--status-present-border); }
.badge-status.absent { background: var(--status-absent-bg); color: var(--status-absent-text); border: 1px solid var(--status-absent-border); }
.badge-status.leave { background: var(--status-leave-bg); color: var(--status-leave-text); border: 1px solid var(--status-leave-border); }
.badge-status.late { background: var(--status-late-bg); color: var(--status-late-text); border: 1px solid var(--status-late-border); }
.badge-status.activity { background: var(--status-activity-bg); color: var(--status-activity-text); border: 1px solid var(--status-activity-border); }

/* Table Styles (For History) */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-top: 16px;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.88rem;
}

.data-table th {
  background-color: #f8fafc;
  color: #475569;
  font-weight: 600;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 12px 14px;
  border-bottom: 1px solid #f1f5f9;
  color: #1e293b;
}

.data-table tr:hover td {
  background-color: #f8fafc;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 100;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: #ffffff;
  border-radius: var(--radius-md);
  padding: 12px 18px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  border-left: 4px solid var(--primary);
  animation: slideIn 0.25s ease-out;
  min-width: 260px;
}

.toast.success { border-left-color: #10b981; }
.toast.error { border-left-color: #ef4444; }

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-muted);
}

.empty-icon {
  font-size: 2.5rem;
  margin-bottom: 12px;
  color: #94a3b8;
}

/* Loading Spinner */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: #fff;
  animation: spin 0.8s linear infinite;
}

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