:root {
      --primary-color: #0d6efd;
      --bg-gradient: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
      --card-bg: rgba(255, 255, 255, 0.9);
      --btn-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
      --btn-hover-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
    }

    body {
      background: var(--bg-gradient);
      min-height: 100vh;
      display: flex;
      align-items: center;
      font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }

    .calculator-card {
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border: 1px solid rgba(255, 255, 255, 0.3);
      border-radius: 24px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
      overflow: hidden;
      transition: transform 0.3s ease;
    }

    .calculator-card:hover {
      transform: translateY(-5px);
    }

    .display-container {
      background: #f8f9fa;
      padding: 20px;
      border-radius: 16px;
      margin-bottom: 20px;
      box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
      height: 100px;
      display: flex;
      align-items: center;
      justify-content: flex-end;
    }

    #result {
      text-align: right;
      font-size: 38px;
      font-weight: 600;
      height: auto;
      border: none;
      background: transparent;
      padding: 0;
      color: #212529;
      box-shadow: none;
      width: 100%;
    }

    .word-display-area {
      margin-top: 15px;
      background: rgba(255, 255, 255, 0.6);
      border-radius: 16px;
      padding: 12px 18px;
      border: 1px dashed rgba(13, 110, 253, 0.2);
      display: none;
      align-items: center;
      justify-content: space-between;
      gap: 15px;
      animation: slideUp 0.3s ease-out;
    }

    @keyframes slideUp {
      from {
        opacity: 0;
        transform: translateY(10px);
      }

      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    #word-result {
      font-size: 14px;
      color: #495057;
      font-weight: 400;
      line-height: 1.4;
      word-wrap: break-word;
      flex-grow: 1;
    }

    #word-result strong {
      color: var(--primary-color);
      font-weight: 600;
    }

    .small-label {
      font-size: 10px;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #adb5bd;
      font-weight: 700;
      display: block;
      margin-bottom: 2px;
    }

    #speak-btn {
      background: var(--primary-color);
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      flex-shrink: 0;
      box-shadow: 0 4px 10px rgba(13, 110, 253, 0.2);
    }

    #speak-btn:hover:not(:disabled) {
      transform: scale(1.05);
      background: #0b5ed7;
    }

    #speak-btn:disabled {
      background: #e9ecef;
      color: #adb5bd;
      box-shadow: none;
    }

    #speak-btn.speaking {
      background: #fa5252;
      animation: pulse 1s infinite;
    }

    @keyframes pulse {
      0% {
        box-shadow: 0 0 0 0 rgba(250, 82, 82, 0.4);
      }

      70% {
        box-shadow: 0 0 0 10px rgba(250, 82, 82, 0);
      }

      100% {
        box-shadow: 0 0 0 0 rgba(250, 82, 82, 0);
      }
    }

    .btn-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 12px;
    }

    .calculator .btn {
      height: 60px;
      border-radius: 14px;
      font-size: 18px;
      font-weight: 600;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      border: none;
      box-shadow: var(--btn-shadow);
    }

    .calculator .btn:hover {
      transform: translateY(-2px);
      box-shadow: var(--btn-hover-shadow);
    }

    .calculator .btn:active {
      transform: translateY(0);
    }

    .btn-light {
      background: #ffffff;
      color: #495057;
    }

    .btn-light:hover {
      background: #f1f3f5;
    }

    .btn-operator {
      background: #e7f1ff;
      color: var(--primary-color);
    }

    .btn-operator:hover {
      background: #cfe2ff;
    }

    .btn-action {
      background: #fff5f5;
      color: #fa5252;
    }

    .btn-redo {
      background: #e7f1ff;
      color: var(--primary-color);
      font-size: 20px;
      font-weight: 600;
    }

    .btn-redo:hover:not(:disabled) {
      background: #cfe2ff;
      transform: translateY(-2px);
    }

    .btn-redo:disabled {
      background: #e9ecef;
      color: #adb5bd;
      cursor: not-allowed;
      opacity: 0.6;
    }

    .btn-action:hover {
      background: #ffe3e3;
    }

    .btn-equals {
      background: var(--primary-color);
      color: white;
      grid-column: span 1;
    }

    .btn-equals:hover {
      background: #0b5ed7;
      color: white;
    }

    .btn-special {
      background: #e7f6ed;
      color: #198754;
      font-size: 16px;
    }

    .btn-special:hover {
      background: #d1f0dd;
    }

    .group-header {
      color: #495057;
      font-weight: 700;
      letter-spacing: 2px;
      margin-bottom: 20px;
      text-transform: uppercase;
      font-size: 1.2rem;
    }

    .theme-toggle-btn {
      position: fixed;
      top: 20px;
      right: 20px;
      z-index: 1000;
    }

    body.dark-mode {
      background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
      color: #e0e0e0;
    }

    body.dark-mode .calculator-card {
      background: rgba(45, 45, 45, 0.9);
      border-color: rgba(255, 255, 255, 0.1);
    }

    body.dark-mode .display-container {
      background: #333333;
      color: #e0e0e0;
    }

    body.dark-mode #result {
      color: #e0e0e0;
    }

    body.dark-mode .btn-light {
      background: #444444;
      color: #e0e0e0;
    }

    body.dark-mode .btn-light:hover {
      background: #555555;
    }

    body.dark-mode .accordion-button {
      background-color: #444444;
      color: #e0e0e0;
    }

    body.dark-mode .accordion-button:not(.collapsed) {
      background-color: #555555;
      color: #e0e0e0;
    }

    body.dark-mode .form-control,
    body.dark-mode .form-select {
      background-color: #444444;
      color: #e0e0e0;
      border-color: #555555;
    }

    body.dark-mode .form-control:focus,
    body.dark-mode .form-select:focus {
      background-color: #555555;
      color: #e0e0e0;
      border-color: #0d6efd;
    }

    #hausa-btn {
      background: #198754;
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: bold;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: 0 4px 10px rgba(25, 135, 84, 0.2);
    }

    #hausa-btn:hover:not(:disabled) {
      background: #157347;
      transform: scale(1.05);
    }

    #hausa-btn:disabled {
      background: #e9ecef;
      color: #adb5bd;
      box-shadow: none;
    }

    #english-btn {
      background: #0d6efd;
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: bold;
    }

    #portuguese-btn {
      background: #dc3545;
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: bold;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: 0 4px 10px rgba(220, 53, 69, 0.2);
    }

    #portuguese-btn:hover:not(:disabled) {
      background: #bb2d3b;
      transform: scale(1.05);
    }

    #portuguese-btn:disabled {
      background: #e9ecef;
      color: #adb5bd;
      box-shadow: none;
    }

    #history-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    }

    .history-item {
      background: rgba(255, 255, 255, 0.85);
      border-radius: 12px;
      padding: 12px 16px;
      display: flex;
      flex-direction: column;
      box-shadow: 0 4px 8px rgba(0, 0, 0, 0.08);
      cursor: pointer;
      transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.5s ease;
      opacity: 0;
    }

    .history-item.show {
      opacity: 1;
    }

    .history-item:hover {
      transform: translateY(-3px);
      box-shadow: 0 6px 12px rgba(0, 0, 0, 0.12);
    }

    .history-item-expression {
      font-weight: 600;
      color: #212529;
      font-size: 16px;
    }

    .history-item-words {
      font-style: italic;
      color: #495057;
      font-size: 14px;
      margin-top: 4px;
    }

    .history-item-time {
      font-size: 12px;
      color: #6c757d;
      margin-top: 2px;
      text-align: right;
    }

    #clear-history-btn {
      text-align: center;
      font-size: 14px;
      font-weight: 600;
      color: white;
      background: var(--primary-color);
      border: none;
      border-radius: 12px;
      padding: 6px 0;
      cursor: pointer;
      transition: background 0.2s ease, transform 0.2s ease;
    }

    #clear-history-btn:hover {
      background: #0b5ed7;
      transform: translateY(-2px);
    }

    #clear-history-btn:active {
      transform: translateY(0);
    }

    .history-actions {
      display: none;
      gap: 8px;
      margin-top: 8px;
    }

    .history-item:hover .history-actions {
      display: flex;
    }

    .history-action-btn {
      font-size: 12px;
      padding: 4px 10px;
      border-radius: 20px;
      border: none;
      cursor: pointer;
      transition: all 0.2s ease;
    }

    .btn-delete {
      background: #ffe3e3;
      color: #fa5252;
    }

    .btn-delete:hover {
      background: #ffc9c9;
    }

    .btn-remark {
      background: #e7f1ff;
      color: #0d6efd;
    }

    .btn-remark:hover {
      background: #cfe2ff;
    }

    .remark-box {
      margin-top: 8px;
      display: flex;
      gap: 6px;
    }

    .remark-box input {
      flex: 1;
      border-radius: 12px;
      border: 1px solid #ced4da;
      padding: 4px 10px;
      font-size: 12px;
    }

    .remark-text {
      font-size: 13px;
      color: #6c757d;
      font-style: italic;
      margin-top: 4px;
    }

    #scroll-to-calculator {
      position: fixed;
      bottom: 24px;
      right: 24px;
      width: 46px;
      height: 46px;
      border-radius: 14px;
      background: rgba(13, 110, 253, 0.15);
      color: var(--primary-color);
      border: none;
      font-size: 22px;
      font-weight: 700;
      cursor: pointer;
      opacity: 0.15;
      transform: translateY(10px);
      pointer-events: none;
      transition: all 0.3s ease;
      box-shadow: 0 8px 20px rgba(13, 110, 253, 0.15);
      backdrop-filter: blur(6px);
      z-index: 999;
    }

    body:hover #scroll-to-calculator {
      opacity: 0.6;
      transform: translateY(0);
      pointer-events: auto;
    }

    #scroll-to-calculator:hover {
      opacity: 1;
      background: var(--primary-color);
      color: white;
      transform: scale(1.05);
    }

    #answer-preview {
      padding: 0 16px;
      border-radius: 16px;
      background: #1d1d1e !important;
      display: block;
      font-size: 1.2rem;
      color: #ffffff;
      font-style: italic;
      letter-spacing: 0.02em;
      transition: opacity 0.2s ease;
    }

    #answer-preview:empty {
      opacity: 0;
    }

    .currency-panel {
      margin-top: 20px;
    }

    #igbo-btn {
      background: #6f42c1;
      border: none;
      color: white;
      width: 40px;
      height: 40px;
      border-radius: 12px;
      font-size: 12px;
      font-weight: bold;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
      box-shadow: 0 4px 10px rgba(111, 66, 193, 0.2);
    }

    #igbo-btn:hover:not(:disabled) {
      background: #5a32a3;
      transform: scale(1.05);
    }

    #igbo-btn:disabled {
      background: #e9ecef;
      color: #adb5bd;
      box-shadow: none;
    }
     .wrapper { width: 100%; max-width: 680px; }
 
    /* ── Age / Date accordion card ── */
    .adc-card {
      background: var(--card-bg);
      border-radius: 18px;
      box-shadow: 0 12px 32px rgba(0,0,0,0.10);
      overflow: hidden;
    }
    .adc-tabs {
      display: flex;
      background: #f1f3f5;
      border-bottom: 2px solid #dee2e6;
    }
    .adc-tab {
      flex: 1;
      padding: 10px 6px;
      text-align: center;
      font-size: .78rem;
      font-weight: 700;
      letter-spacing: .3px;
      cursor: pointer;
      border: none;
      background: transparent;
      color: #6c757d;
      transition: background .18s, color .18s;
      border-bottom: 3px solid transparent;
    }
    .adc-tab.active {
      background: white;
      color: var(--primary-color);
      border-bottom: 3px solid var(--primary-color);
    }
    .adc-tab:hover:not(.active) { background: #e9ecef; color: #495057; }
 
    .adc-pane { display: none; padding: 20px; }
    .adc-pane.active { display: block; }
 
    /* Result chip strip */
    .chip-row {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }
    .camera-solver-modal {
      display: none;
      position: fixed;
      inset: 0;
      z-index: 10000;
      background: rgba(15, 23, 42, 0.72);
      padding: 20px;
      align-items: center;
      justify-content: center;
    }

    .camera-solver-modal.open {
      display: flex;
    }

    .camera-solver-card {
      width: min(720px, 100%);
      background: #ffffff;
      border-radius: 24px;
      padding: 20px;
      box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
    }

    .camera-solver-preview {
      width: 100%;
      min-height: 280px;
      max-height: 420px;
      object-fit: cover;
      background: #0f172a;
      border-radius: 18px;
      border: 1px solid rgba(13, 110, 253, 0.15);
    }

    .camera-solver-canvas {
      display: none;
    }

    .camera-solver-toolbar {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 14px;
    }
    .camera-solver-status {
      margin-top: 14px;
      font-size: 14px;
      color: #495057;
      min-height: 21px;
    }

    .camera-solver-result {
      margin-top: 14px;
      background: #f8f9fa;
      border-radius: 16px;
      padding: 14px 16px;
      border: 1px solid rgba(13, 110, 253, 0.12);
    }

    .camera-solver-input {
      width: 100%;
      border: 1px solid rgba(13, 110, 253, 0.2);
      border-radius: 12px;
      padding: 10px 12px;
      min-height: 88px;
      resize: vertical;
      font-size: 16px;
      color: #0d6efd;
      background: #ffffff;
    }
    
    .chip {
      background: #e7f1ff;
      border-radius: 12px;
      padding: 8px 14px;
      text-align: center;
      flex: 1 1 130px;
    }
    .chip .chip-val {
      display: block;
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-color);
      line-height: 1.1;
    }
    .chip .chip-lbl {
      display: block;
      font-size: .72rem;
      color: #6c757d;
      text-transform: uppercase;
      letter-spacing: .5px;
      margin-top: 2px;
    }
 
    /* Zodiac badge */
    .zodiac-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: linear-gradient(135deg, #667eea, #764ba2);
      color: white;
      padding: 8px 16px;
      border-radius: 20px;
      font-weight: 700;
      font-size: .9rem;
      margin-top: 12px;
    }
    .zodiac-badge .z-emoji { font-size: 1.4rem; }
 
    /* Highlight result box */
    .highlight-box {
      background: #f8f9fa;
      border-left: 4px solid var(--primary-color);
      border-radius: 8px;
      padding: 12px 16px;
      margin-top: 14px;
      font-size: .9rem;
    }
    .highlight-box strong { color: var(--primary-color); }
 
    /* Progress bar for day-of-year */
    .year-bar-wrap { margin-top: 14px; }
    .year-bar-label {
      display: flex;
      justify-content: space-between;
      font-size: .75rem;
      color: #6c757d;
      margin-bottom: 4px;
    }
    .year-bar .progress-bar { transition: width .5s ease; }
 
    /* Countdown ring */
    .countdown-ring-wrap {
      display: flex;
      justify-content: center;
      margin: 14px 0 8px;
    }
    .ring-svg { transform: rotate(-90deg); }
    .ring-bg { fill: none; stroke: #e9ecef; stroke-width: 10; }
    .ring-fg { fill: none; stroke: var(--primary-color); stroke-width: 10;
               stroke-linecap: round; transition: stroke-dashoffset .6s ease; }
    .ring-text {
      font-size: .82rem;
      font-weight: 700;
      fill: #212529;
      dominant-baseline: middle;
      text-anchor: middle;
    }
    .ring-sub {
      font-size: .55rem;
      fill: #6c757d;
      dominant-baseline: middle;
      text-anchor: middle;
    }
 
    .section-title {
      font-size: .7rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: #adb5bd;
      margin-bottom: 8px;
    }
    #yoruba-btn {
  background: #f59f00;
  border: none;
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: bold;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  box-shadow: 0 4px 10px rgba(245, 159, 0, 0.2);
}

#yoruba-btn:hover:not(:disabled) {
  background: #d97706;
  transform: scale(1.05);
}

#yoruba-btn:disabled {
  background: #e9ecef;
  color: #adb5bd;
  box-shadow: none;
}
 
  /* error state */
  .adc-error { color: #dc3545; font-size: .85rem; margin-top: 6px; display: none; }