.hidden {
    display: none;
  }

  .pet-age-calculator {
    position: relative;
    max-width: 650px;
    margin: 2rem auto;
    background: var(--color-surface, #fff);
    border-radius: 2rem;
    padding: 2.5rem;
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.08);
    color: var(--color-text, #334155);
    border: 1px solid var(--color-border, #f1f5f9);
    min-height: 400px;
  }

  .theme-dark .pet-age-calculator {
    background: var(--color-surface-dark, #1e293b);
    color: var(--color-text-dark, #e2e8f0);
    border-color: var(--color-border-dark, #334155);
    box-shadow: 0 20px 50px -15px rgba(0, 0, 0, 0.3);
  }

  .age-loader {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-surface, #fff);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 2rem;
    z-index: 50;
    transition:
      opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
      visibility 0.4s;
  }

  .theme-dark .age-loader {
    background: var(--color-surface-dark, #1e293b);
  }

  .age-loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  .age-loader-spinner {
    width: 3rem;
    height: 3rem;
    color: var(--color-accent, #f59e0b);
    animation: age-spin 2s infinite linear;
  }

  @keyframes age-spin {
    from {
      transform: rotate(0deg);
    }
    to {
      transform: rotate(360deg);
    }
  }

  .age-container {
    display: flex;
    flex-direction: column;
    gap: 3rem;
    animation: age-fade-up 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  }

  @keyframes age-fade-up {
    from {
      opacity: 0;
      transform: translateY(10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .age-section {
    border-bottom: 1px dashed var(--color-border-dashed, #e2e8f0);
    padding-bottom: 2rem;
  }

  .age-section:last-of-type {
    border-bottom: none;
  }

  .theme-dark .age-section {
    border-bottom-color: var(--color-border-dark, #334155);
  }

  .age-section-title {
    font-size: 1.1rem;
    font-weight: 950;
    color: var(--color-heading, #0f172a);
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .theme-dark .age-section-title {
    color: var(--color-heading-dark, #f8fafc);
  }

  .age-section-title svg {
    width: 1.25rem;
    height: 1.25rem;
  }

  .age-input-item {
    margin-bottom: 2rem;
  }

  .age-input-item:last-child {
    margin-bottom: 0;
  }

  .age-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--color-label, #94a3b8);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
  }

  .age-text-input {
    width: 100%;
    padding: 0.875rem 1.25rem;
    background: var(--color-btn-bg, #f8fafc);
    border: 2px solid var(--color-btn-border, #e2e8f0);
    border-radius: 1rem;
    font-size: 1rem;
    font-weight: 700;
    color: var(--color-text, #334155);
    outline: none;
    transition:
      border-color 0.2s,
      box-shadow 0.2s;
    box-sizing: border-box;
  }

  .age-text-input::placeholder {
    color: var(--color-label, #94a3b8);
    font-weight: 500;
  }

  .age-text-input:focus {
    border-color: var(--color-accent, #f59e0b);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.1);
  }

  .theme-dark .age-text-input {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
    color: var(--color-text-dark, #e2e8f0);
  }

  .age-species-selector {
    display: flex;
    gap: 1rem;
  }

  .pet-type-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 1.25rem 0.75rem;
    background: var(--color-btn-bg, #f8fafc);
    border: 2px solid var(--color-btn-border, #e2e8f0);
    border-radius: 1rem;
    cursor: pointer;
    font-weight: 800;
    font-size: 1rem;
    color: var(--color-text, #334155);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .theme-dark .pet-type-btn {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
    color: var(--color-text-dark, #e2e8f0);
  }

  .pet-type-btn.active {
    background: var(--color-surface, #fff);
    border-color: var(--color-accent, #f59e0b);
    color: var(--color-accent, #f59e0b);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.15);
    transform: translateY(-2px);
  }

  .theme-dark .pet-type-btn.active {
    background: var(--color-surface-elevated-dark, #1e293b);
  }

  .age-icon {
    width: 1.5rem;
    height: 1.5rem;
  }

  .age-segmented {
    display: flex;
    background: var(--color-btn-bg, #f8fafc);
    padding: 6px;
    border-radius: 1rem;
    border: 1px solid var(--color-btn-border, #e2e8f0);
  }

  .theme-dark .age-segmented {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
  }

  .size-btn {
    flex: 1;
    text-align: center;
    padding: 0.85rem;
    border-radius: 0.75rem;
    cursor: pointer;
    font-weight: 700;
    font-size: 0.85rem;
    border: none;
    background: transparent;
    color: var(--color-muted, #64748b);
    transition: all 0.2s;
  }

  .size-btn.active {
    background: var(--color-accent, #f59e0b);
    color: var(--color-on-accent, #fff);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.3);
  }

  .age-year-wrap {
    display: flex;
    justify-content: center;
  }

  .age-year-input {
    width: 200px;
    text-align: center;
    padding: 1rem;
    background: var(--color-btn-bg, #f8fafc);
    border: 2px solid var(--color-btn-border, #e2e8f0);
    border-radius: 1rem;
    font-size: 2.5rem;
    font-weight: 900;
    color: var(--color-text, #334155);
    outline: none;
    transition:
      border-color 0.2s,
      box-shadow 0.2s;
    box-sizing: border-box;
  }

  .age-year-input::placeholder {
    color: var(--color-label, #94a3b8);
    font-weight: 400;
    font-size: 1rem;
  }

  .age-year-input:focus,
  .age-year-input.age-input-valid {
    border-color: var(--color-accent, #f59e0b);
    box-shadow: 0 0 0 4px rgba(245, 158, 11, 0.1);
  }

  .age-year-input.age-input-error {
    border-color: #ef4444;
    box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.1);
  }

  .theme-dark .age-year-input {
    background: var(--color-btn-bg-dark, #0f172a);
    border-color: var(--color-btn-border-dark, #334155);
    color: var(--color-text-dark, #e2e8f0);
  }

  .age-year-input::-webkit-inner-spin-button,
  .age-year-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
  }
  .age-year-input[type="number"] {
    -moz-appearance: textfield;
  }

  .age-results {
    background: var(--color-results-bg, #0f172a);
    border-radius: 2rem;
    padding: 2.5rem;
    color: var(--color-results-text, #fff);
    box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.3);
  }

  .theme-dark .age-results {
    background: var(--color-accent, #f59e0b);
    color: var(--color-results-text-dark, #0f172a);
    box-shadow: 0 20px 40px -10px rgba(245, 158, 11, 0.2);
  }

  .age-res-main {
    text-align: center;
    margin-bottom: 1.5rem;
  }

  .age-res-label {
    display: block;
    font-size: 0.8rem;
    font-weight: 900;
    text-transform: uppercase;
    color: var(--color-accent, #f59e0b);
    letter-spacing: 0.15em;
    margin-bottom: 0.5rem;
  }

  .theme-dark .age-res-label {
    color: var(--color-results-bg, #0f172a);
    opacity: 0.7;
  }

  .age-res-number {
    font-size: 5rem;
    font-weight: 950;
    line-height: 1;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
  }

  .age-res-number small {
    font-size: 1.5rem;
    font-weight: 700;
    opacity: 0.6;
  }

  .age-res-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 1.5rem 0;
  }

  .theme-dark .age-res-divider {
    background: rgba(0, 0, 0, 0.1);
  }

  .age-res-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .age-res-card {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1rem;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
  }

  .theme-dark .age-res-card {
    background: rgba(0, 0, 0, 0.1);
    border-color: rgba(0, 0, 0, 0.1);
  }

  .age-res-card-label {
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.6;
  }

  .age-res-card-val {
    font-size: 0.9rem;
    font-weight: 700;
    line-height: 1.2;
  }

  .age-res-footer {
    display: flex;
    justify-content: center;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .theme-dark .age-res-footer {
    border-top-color: rgba(0, 0, 0, 0.1);
  }

  .age-share-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    font-weight: 700;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
  }

  .age-share-btn:hover {
    background: rgba(255, 255, 255, 0.2);
  }

  .theme-dark .age-share-btn {
    background: rgba(0, 0, 0, 0.15);
    border-color: rgba(0, 0, 0, 0.2);
    color: var(--color-results-bg, #0f172a);
  }

  .age-share-btn.age-btn-success {
    background: rgba(255, 255, 255, 0.25);
  }

  .age-icon-sm {
    width: 1rem;
    height: 1rem;
  }

  .age-share-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: #0f172a;
    padding: 1.5rem;
  }

  .age-share-overlay.visible {
    display: flex;
  }

  .age-share-wrap {
    width: 100%;
    max-width: 420px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
  }

  .age-share-card {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 2.5rem;
    overflow: hidden;
    color: #fff;
  }

  .age-share-card-header {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .age-share-badge {
    background: rgba(99, 102, 241, 0.8);
    color: #fff;
    font-size: 0.65rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    padding: 0.4rem 1rem;
    border-radius: 2rem;
  }

  .age-share-animal {
    width: 5rem;
    height: 5rem;
    background: rgba(15, 23, 42, 0.8);
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #a5b4fc;
  }

  .age-share-animal svg {
    width: 3rem;
    height: 3rem;
  }

  #share-pet-name {
    font-size: 2rem;
    font-weight: 900;
    text-align: center;
    color: #fff;
    margin: 0;
  }

  .age-share-card-body {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
  }

  .age-share-human-label {
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: rgba(165, 180, 252, 0.7);
  }

  #share-human-age {
    font-size: 7rem;
    font-weight: 900;
    line-height: 0.9;
    color: #fff;
  }

  .age-share-years-label {
    font-size: 1.5rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(255, 255, 255, 0.4);
    margin-top: -0.5rem;
  }

  .age-share-info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
    width: 100%;
    margin-top: 0.75rem;
  }

  .age-share-info-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
    text-align: center;
  }

  .age-share-info-label {
    font-size: 0.65rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: rgba(165, 180, 252, 0.5);
  }

  .age-share-info-val {
    font-size: 0.85rem;
    font-weight: 700;
    color: #fff;
  }

  .age-share-card-footer {
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
    font-size: 0.65rem;
    font-weight: 900;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.3);
  }

  .age-share-new-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    padding: 0.75rem 1.5rem;
    border-radius: 2rem;
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.2s;
  }

  .age-share-new-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
  }

  .age-share-new-btn svg {
    width: 1rem;
    height: 1rem;
  }

  @media (max-width: 600px) {
    .pet-age-calculator {
      padding: 1.5rem;
      margin: 1rem;
    }

    .age-species-selector {
      flex-direction: column;
    }

    .age-res-grid {
      grid-template-columns: 1fr;
    }

    .age-res-number {
      font-size: 4rem;
    }

    .age-year-input {
      font-size: 2rem;
    }
  }