:root {
    --f88-green: #00833E;
    --f88-green-light: #00A651;
    --f88-green-soft: #E6F4EC;
    --f88-yellow: #FDB913;
    --f88-yellow-soft: #FFF8E6;
    --bg-main: #F4F7F5;
    --bg-card: #FFFFFF;
    --text-primary: #111827;
    --text-secondary: #4B5563;
    --text-muted: #6B7280;
    --border-color: #D1D5DB;
    --danger: #DC2626;
    --danger-soft: #FEF2F2;
    --success: #059669;
    --radius-lg: 14px;
    --radius-md: 10px;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 8px 24px rgba(0, 50, 20, 0.08);
  }

  * {
    box-sizing: border-box;
  }

  body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, Arial, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
  }

  /* Layout Shells */
  .app-shell {
    max-width: 920px;
    margin: 0 auto;
    padding: 20px 16px 56px;
  }

  .admin-shell {
    max-width: 1240px;
    margin: 0 auto;
    padding: 20px 16px 64px;
  }

  /* Header F88 */
  .app-header {
    background: linear-gradient(135deg, var(--f88-green) 0%, #006830 100%);
    color: #FFFFFF;
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    box-shadow: var(--shadow-md);
    border-bottom: 5px solid var(--f88-yellow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 22px;
  }

  .brand-group {
    display: flex;
    align-items: center;
    gap: 16px;
  }

  /* Logo F88 nền trắng */
  .brand-badge {
    background: #FFFFFF;
    color: var(--f88-green);
    font-weight: 900;
    font-size: 21px;
    padding: 10px 16px;
    border-radius: 10px;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.16);
    border: 2px solid #FFFFFF;
  }

  .app-header h1 {
    margin: 0;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.2px;
  }

  .app-header p {
    margin: 4px 0 0;
    font-size: 14px;
    opacity: 0.94;
  }

  /* Status Pill */
  .status-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 600;
    background: rgba(255, 255, 255, 0.16);
    color: #FFFFFF;
    border: 1px solid rgba(255, 255, 255, 0.3);
  }

  .status-pill.status-read {
    background: var(--f88-yellow);
    color: #111827;
    border-color: var(--f88-yellow);
  }

  .status-pill.status-done {
    background: #10B981;
    color: #FFFFFF;
    border-color: #059669;
  }

  /* Stepper */
  .stepper {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 22px;
  }

  .step-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-muted);
    transition: all 0.2s ease;
  }

  .step-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #E5E7EB;
    color: #4B5563;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
    flex-shrink: 0;
  }

  .step-item.active {
    border-color: var(--f88-green);
    background: var(--f88-green-soft);
    color: var(--f88-green);
    box-shadow: 0 2px 6px rgba(0, 131, 62, 0.12);
  }

  .step-item.active .step-num {
    background: var(--f88-green);
    color: #FFFFFF;
  }

  .step-item.completed {
    border-color: #A7F3D0;
    background: #ECFDF5;
    color: #065F46;
  }

  .step-item.completed .step-num {
    background: var(--f88-yellow);
    color: #111827;
  }

  /* Cards */
  .card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 24px 26px;
    box-shadow: var(--shadow-sm);
    border: 1px solid #E5E7EB;
    margin-bottom: 20px;
  }

  .card-title {
    margin: 0 0 6px;
    font-size: 18px;
    font-weight: 700;
    color: var(--f88-green);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
  }

  .card-subtitle {
    margin: 0 0 20px;
    font-size: 14px;
    color: var(--text-secondary);
  }

  /* Summary Context Banner */
  .context-banner {
    background: var(--f88-yellow-soft);
    border: 1px solid #FDE68A;
    border-left: 5px solid var(--f88-yellow);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    margin-bottom: 18px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    font-size: 14px;
  }

  .context-items {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
  }

  .context-items span strong {
    color: var(--f88-green);
  }

  /* Form Controls */
  .form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 16px;
    margin-bottom: 18px;
  }

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

  .form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
  }

  .req {
    color: var(--danger);
    margin-left: 2px;
  }

  input[type="text"],
  input[type="number"],
  input[type="date"],
  input[type="url"],
  select,
  textarea {
    width: 100%;
    padding: 10px 13px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 14.5px;
    font-family: inherit;
    color: var(--text-primary);
    background: #FFFFFF;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
  }

  input:focus,
  select:focus,
  textarea:focus {
    outline: none;
    border-color: var(--f88-green);
    box-shadow: 0 0 0 3px rgba(0, 131, 62, 0.15);
  }

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

  /* Buttons */
  .btn-row {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 18px;
  }

  .btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.18s ease;
    text-decoration: none;
    font-family: inherit;
  }

  .btn:disabled {
    opacity: 0.55;
    cursor: not-allowed;
  }

  .btn-primary {
    background: var(--f88-green);
    color: #FFFFFF;
  }

  .btn-primary:hover:not(:disabled) {
    background: #006B32;
  }

  .btn-accent {
    background: var(--f88-yellow);
    color: #111827;
  }

  .btn-accent:hover:not(:disabled) {
    background: #E5A50A;
  }

  .btn-outline {
    background: #FFFFFF;
    color: var(--text-primary);
    border-color: var(--border-color);
  }

  .btn-outline:hover:not(:disabled) {
    background: #F3F4F6;
    border-color: #9CA3AF;
  }

  .btn-sm {
    padding: 6px 12px;
    font-size: 13px;
  }

  /* Tables */
  .table-wrap {
    width: 100%;
    overflow-x: auto;
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-md);
    margin: 14px 0;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
    font-size: 14px;
  }

  th {
    background: var(--f88-green-soft);
    color: var(--f88-green);
    font-weight: 700;
    text-align: left;
    padding: 12px 14px;
    border-bottom: 2px solid #A7F3D0;
    white-space: nowrap;
  }

  td {
    padding: 12px 14px;
    border-bottom: 1px solid #E5E7EB;
    color: var(--text-primary);
    vertical-align: middle;
  }

  tr:last-child td {
    border-bottom: none;
  }

  tr:hover td {
    background: #F9FAFB;
  }

  .badge {
    display: inline-block;
    padding: 3px 9px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 600;
  }

  .badge-online {
    background: #DBEAFE;
    color: #1E40AF;
  }

  .badge-offline {
    background: #FEF3C7;
    color: #92400E;
  }

  .badge-blended {
    background: #EDE9FE;
    color: #5B21B6;
  }

  .badge-active {
    background: #D1FAE5;
    color: #065F46;
  }

  .badge-inactive {
    background: #FEE2E2;
    color: #991B1B;
  }

  /* Confirmation Box */
  .confirm-box {
    background: var(--f88-green-soft);
    border: 2px solid var(--f88-green);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    margin-top: 18px;
    display: flex;
    align-items: flex-start;
    gap: 12px;
    cursor: pointer;
  }

  .confirm-box input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-top: 2px;
    accent-color: var(--f88-green);
    cursor: pointer;
    flex-shrink: 0;
  }

  .confirm-box-text {
    font-size: 14.5px;
    font-weight: 600;
    color: #064E3B;
  }

  .confirm-box-sub {
    display: block;
    font-size: 13px;
    font-weight: 400;
    color: var(--text-secondary);
    margin-top: 3px;
  }

  /* Survey Question Groups */
  .survey-group-section {
    background: #FFFFFF;
    border: 1px solid #D1D5DB;
    border-radius: var(--radius-lg);
    margin-bottom: 24px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.04);
    overflow: hidden;
  }

  .survey-group-header {
    background: linear-gradient(135deg, var(--f88-green) 0%, #006830 100%);
    color: #FFFFFF;
    padding: 13px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 3.5px solid var(--f88-yellow);
  }

  .survey-group-badge {
    background: #FFFFFF;
    color: var(--f88-green);
    font-weight: 800;
    font-size: 13px;
    padding: 4px 10px;
    border-radius: 6px;
    letter-spacing: 0.3px;
    white-space: nowrap;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.15);
  }

  .survey-group-title {
    font-size: 16px;
    font-weight: 700;
    color: #FFFFFF;
    letter-spacing: 0.2px;
  }

  .survey-group-body {
    padding: 20px 22px;
    display: flex;
    flex-direction: column;
    gap: 16px;
  }

  /* Survey Questions */
  .question-block {
    background: #FAFAFA;
    border: 1px solid #E5E7EB;
    border-radius: var(--radius-md);
    padding: 18px 20px;
    margin-bottom: 16px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
  }

  .question-block.question-missing {
    border: 2px solid var(--danger);
    background: #FEF2F2;
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
  }

  .question-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0 0 12px;
  }

  .options-list {
    display: flex;
    flex-direction: column;
    gap: 9px;
  }

  .option-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #E5E7EB;
    background: #FFFFFF;
    cursor: pointer;
    transition: all 0.15s ease;
  }

  .option-item:hover {
    border-color: var(--f88-green);
    background: var(--f88-green-soft);
  }

  .option-item input[type="radio"] {
    margin-top: 3px;
    width: 17px;
    height: 17px;
    accent-color: var(--f88-green);
    flex-shrink: 0;
  }

  .option-label-tag {
    font-weight: 700;
    color: var(--f88-green);
    min-width: 22px;
  }

  /* Alerts & Empty States */
  .alert {
    padding: 13px 16px;
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }

  .alert-error {
    background: var(--danger-soft);
    color: #991B1B;
    border: 1px solid #FECACA;
  }

  .alert-success {
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
  }

  .alert-warning {
    background: var(--f88-yellow-soft);
    color: #92400E;
    border: 1px solid #FDE68A;
  }

  .empty-state {
    text-align: center;
    padding: 32px 20px;
    background: #F9FAFB;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
  }

  /* Admin Navigation & KPIs */
  .admin-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
    background: #FFFFFF;
    padding: 8px;
    border-radius: var(--radius-md);
    border: 1px solid #E5E7EB;
  }

  .tab-btn {
    padding: 10px 18px;
    border-radius: 8px;
    border: none;
    background: transparent;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.15s ease;
  }

  .tab-btn:hover {
    background: #F3F4F6;
    color: var(--text-primary);
  }

  .tab-btn.active {
    background: var(--f88-green);
    color: #FFFFFF;
  }

  .kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 16px;
    margin-bottom: 22px;
  }

  .kpi-card {
    background: #FFFFFF;
    border-radius: var(--radius-md);
    padding: 18px 20px;
    border: 1px solid #E5E7EB;
    border-left: 5px solid var(--f88-green);
    box-shadow: var(--shadow-sm);
  }

  .kpi-card.accent {
    border-left-color: var(--f88-yellow);
  }

  .kpi-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
  }

  .kpi-value {
    font-size: 28px;
    font-weight: 800;
    color: var(--text-primary);
    margin-top: 6px;
  }

  .bar-row {
    margin-bottom: 10px;
  }

  .bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 13.5px;
    margin-bottom: 4px;
    font-weight: 500;
  }

  .bar-track {
    height: 10px;
    background: #E5E7EB;
    border-radius: 999px;
    overflow: hidden;
  }

  .bar-fill {
    height: 100%;
    background: var(--f88-green);
    border-radius: 999px;
    transition: width 0.3s ease;
  }

  /* Loading Overlay */
  .loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.78);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
  }

  .spinner {
    width: 42px;
    height: 42px;
    border: 4px solid #D1FAE5;
    border-top-color: var(--f88-green);
    border-radius: 50%;
    animation: spin 0.75s linear infinite;
  }

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

  /* Modal */
  .modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(17, 24, 39, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    z-index: 1000;
  }

  .modal-card {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    max-width: 640px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: 24px;
    box-shadow: 0 20px 35px rgba(0, 0, 0, 0.2);
  }

  /* Import Box in Admin */
  .import-panel {
    background: #F0FDF4;
    border: 1px dashed var(--f88-green);
    border-radius: var(--radius-md);
    padding: 16px 18px;
    margin-bottom: 18px;
  }

  [hidden] {
    display: none !important;
  }

  @media (max-width: 680px) {
    .stepper {
      grid-template-columns: 1fr;
    }
    .app-header {
      padding: 18px 20px;
    }
    .card {
      padding: 18px 16px;
    }
  }