:root {
    --cell-primary: #f43f5e;
    --cell-secondary: #8b5cf6;
    --cell-text: #0f172a;
    --cell-text-muted: #475569;
    --cell-bg: #fff;
    --cell-bg-secondary: #f8fafc;
    --cell-bg-tertiary: #f1f5f9;
    --cell-border: #e2e8f0;
    --cell-bar: linear-gradient(90deg, #f43f5e 0%, #8b5cf6 100%);
  }

  .theme-dark {
    --cell-primary: #ff6b7a;
    --cell-secondary: #a78bfa;
    --cell-text: #fff;
    --cell-text-muted: #a0aec0;
    --cell-bg: #0f172a;
    --cell-bg-secondary: #1c1f2e;
    --cell-bg-tertiary: #151720;
    --cell-border: #2d3748;
    --cell-bar: linear-gradient(90deg, #ff6b7a 0%, #a78bfa 100%);
  }

  .cellular-app {
    max-width: 850px;
    margin: 0 auto;
  }

  .cellular-card {
    background: var(--cell-bg);
    border: 1px solid var(--cell-border);
    border-radius: 24px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  }

  .theme-dark .cellular-card {
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  .input-section {
    margin-bottom: 3.5rem;
  }

  .input-group {
    background: var(--cell-bg-secondary);
    padding: 2rem;
    border-radius: 20px;
    border: 1px solid var(--cell-border);
  }

  .input-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--cell-text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
    display: block;
  }

  .age-display {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
  }

  #ageDisplay {
    font-size: 3.5rem;
    font-weight: 950;
    color: var(--cell-primary);
    line-height: 1;
  }

  .age-unit {
    font-size: 0.95rem;
    color: var(--cell-primary);
    font-weight: 500;
  }

  input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 10px;
    background: var(--cell-bg-tertiary);
    border-radius: 8px;
    outline: none;
    border: 1px solid var(--cell-border);
  }

  input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    background: var(--cell-primary);
    border: 3px solid var(--cell-bg);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.1s;
  }

  input[type="range"]::-webkit-slider-thumb:active {
    transform: scale(1.2);
  }

  input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    background: var(--cell-primary);
    border: 3px solid var(--cell-bg);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.1s;
  }

  input[type="range"]::-moz-range-thumb:active {
    transform: scale(1.2);
  }

  .results-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2.5rem;
  }

  @media (max-width: 640px) {
    .results-grid {
      grid-template-columns: 1fr;
    }
  }

  .main-stat {
    background: var(--cell-bg-secondary);
    padding: 2.5rem;
    border-radius: 20px;
    border: 2px solid var(--cell-primary);
    text-align: center;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 280px;
  }

  .main-stat-label {
    font-size: 0.875rem;
    color: var(--cell-text-muted);
    font-weight: 600;
    margin-bottom: 1.5rem;
    line-height: 1.4;
  }

  .main-stat-value {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 1.5rem;
  }

  #newStatVal {
    font-size: 5rem;
    font-weight: 950;
    color: var(--cell-primary);
    line-height: 1;
  }

  .percent-sign {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--cell-primary);
  }

  .main-stat-sublabel {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--cell-primary);
    letter-spacing: 2px;
    text-transform: uppercase;
  }

  .tissue-list {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .tissue-item {
    background: var(--cell-bg-secondary);
    padding: 1.25rem;
    border-radius: 14px;
    border: 1px solid var(--cell-border);
  }

  .tissue-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
  }

  .tissue-name {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--cell-text);
  }

  .tissue-percentage {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--cell-primary);
  }

  .bar-container {
    width: 100%;
    height: 10px;
    background: var(--cell-bg-tertiary);
    border-radius: 5px;
    overflow: hidden;
  }

  .bar-fill {
    height: 100%;
    background: var(--cell-bar);
    border-radius: 4px;
    transition: width 0.3s ease;
  }

  .disclaimer {
    font-size: 0.875rem;
    color: #78660b;
    line-height: 1.7;
    padding: 1.5rem;
    background-color: #fef9e7;
    border-radius: 12px;
    border: 1px solid #fce8aa;
    margin: 2.5rem auto 0;
    max-width: 600px;
    text-align: center;
  }

  .theme-dark .disclaimer {
    color: #78660b;
    background-color: #fef9e7;
    border-color: #fce8aa;
  }

  @media (max-width: 640px) {
    .cellular-card {
      padding: 1.5rem;
    }

    #newStatVal {
      font-size: 2.5rem;
    }

    .input-group {
      padding: 1rem;
    }
  }