.ess {
    --ess-primary: #3b82f6;
    --ess-accent: #f59e0b;
    --ess-success: #10b981;
    --ess-danger: #ef4444;
    --ess-warning: #f97316;
    --ess-bg: #f8fafc;
    --ess-surface: #fff;
    --ess-border: rgba(59, 130, 246, 0.2);
    --ess-text: #0f172a;
    --ess-muted: #475569;
    --ess-option-bg: #f1f5f9;
    --ess-option-border: rgba(0, 0, 0, 0.06);
    --ess-nav-bg: #f1f5f9;
    --ess-nav-border: #cbd5e1;
    --ess-nav-text: #1e293b;
    --ess-progress-track: rgba(0, 0, 0, 0.06);

    max-width: 860px;
    margin: 0 auto;
    padding: 1rem;
  }

  
  .ess__quiz,
  .ess__results {
    background: var(--ess-surface);
    border: 2px solid var(--ess-border);
    border-radius: 2.5rem;
    padding: 4rem;
    position: relative;
    overflow: hidden;
  }

  
  .ess__progress {
    height: 8px;
    background: var(--ess-progress-track);
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 3rem;
    border: 1px solid var(--ess-option-border);
  }

  .ess__progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--ess-primary), var(--ess-success));
    width: 0%;
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 0 12px rgba(59, 130, 246, 0.4);
  }

  
  .ess__card {
    display: none;
    animation: ess-slide-in 0.5s cubic-bezier(0.23, 1, 0.32, 1);
  }

  .ess__card--active {
    display: block;
  }

  @keyframes ess-slide-in {
    from { opacity: 0; transform: scale(0.97) translateY(16px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
  }

  .ess__question-header {
    margin-bottom: 3rem;
    text-align: center;
  }

  .ess__question-number {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    color: var(--ess-accent);
    font-weight: 900;
    margin-bottom: 1rem;
    display: block;
  }

  .ess__question-text {
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--ess-text);
    text-wrap: balance;
    margin: 0;
  }

  
  .ess__options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .ess__option {
    background: var(--ess-option-bg);
    border: 1px solid var(--ess-option-border);
    border-radius: 1.5rem;
    padding: 1.75rem 1.5rem;
    cursor: pointer;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
  }

  .ess__option:hover {
    background: rgba(59, 130, 246, 0.08);
    border-color: var(--ess-primary);
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.12);
  }

  .ess .ess__option--selected {
    background: var(--ess-primary);
    border-color: var(--ess-primary);
    color: #fff;
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
  }

  .ess .ess__option--selected .ess__option-label {
    color: #fff;
  }

  .ess__option-label {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--ess-text);
  }

  
  .ess__nav {
    margin-top: 3.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--ess-option-border);
    padding-top: 2rem;
  }

  .ess__nav-btn {
    background: var(--ess-nav-bg);
    border: 1px solid var(--ess-nav-border);
    color: var(--ess-nav-text);
    padding: 0.875rem 1.75rem;
    border-radius: 1rem;
    cursor: pointer;
    font-weight: 700;
    font-size: 1rem;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
  }

  .ess__nav-btn:hover:not(:disabled) {
    background: var(--ess-primary);
    border-color: var(--ess-primary);
    color: #fff;
    transform: scale(1.05);
  }

  .ess__nav-btn:disabled {
    opacity: 0.25;
    cursor: not-allowed;
  }

  .ess__step-indicator {
    font-weight: 700;
    opacity: 0.45;
    color: var(--ess-text);
  }

  
  .ess__results {
    display: none;
    text-align: center;
    animation: ess-result-reveal 0.7s cubic-bezier(0.19, 1, 0.22, 1);
  }

  .ess__results--visible {
    display: block;
  }

  @keyframes ess-result-reveal {
    from { opacity: 0; transform: translateY(24px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .ess__score-circle {
    width: 220px;
    height: 220px;
    border-radius: 50%;
    border: 10px solid var(--ess-border);
    background: var(--ess-option-bg);
    margin: 0 auto 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: inset 0 0 30px rgba(59, 130, 246, 0.08);
  }

  .ess__score-num {
    font-size: 5rem;
    font-weight: 950;
    line-height: 1;
    background: linear-gradient(135deg, var(--ess-text) 0%, var(--ess-primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .ess__score-of {
    font-size: 1.1rem;
    color: var(--ess-muted);
    font-weight: 700;
    margin-top: 0.25rem;
  }

  .ess__badge {
    display: inline-block;
    padding: 0.625rem 2.5rem;
    border-radius: 3rem;
    font-weight: 900;
    font-size: 1.15rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
  }

  .ess__badge--normal { background: rgba(16, 185, 129, 0.12); color: #10b981; border: 2px solid #10b981; }
  .ess__badge--mild { background: rgba(245, 158, 11, 0.12); color: #f59e0b; border: 2px solid #f59e0b; }
  .ess__badge--mod { background: rgba(249, 115, 22, 0.12); color: #f97316; border: 2px solid #f97316; }
  .ess__badge--severe { background: rgba(239, 68, 68, 0.12); color: #ef4444; border: 2px solid #ef4444; }

  .ess__result-desc {
    font-size: 1.2rem;
    line-height: 1.7;
    color: var(--ess-muted);
    max-width: 620px;
    margin: 0 auto 2.5rem;
  }

  .ess__reset-btn {
    background: linear-gradient(135deg, var(--ess-primary) 0%, #1e40af 100%);
    color: #fff;
    border: none;
    padding: 1.1rem 3rem;
    border-radius: 1.5rem;
    font-weight: 800;
    font-size: 1.15rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.25);
  }

  .ess__reset-btn:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 20px 45px rgba(30, 64, 175, 0.4);
    filter: brightness(1.1);
  }

  
  .theme-dark .ess {
    --ess-bg: #0f172a;
    --ess-surface: rgba(15, 23, 42, 0.85);
    --ess-border: rgba(59, 130, 246, 0.3);
    --ess-text: #f8fafc;
    --ess-muted: #94a3b8;
    --ess-option-bg: rgba(255, 255, 255, 0.04);
    --ess-option-border: rgba(255, 255, 255, 0.08);
    --ess-nav-bg: rgba(15, 23, 42, 0.5);
    --ess-nav-border: rgba(59, 130, 246, 0.3);
    --ess-nav-text: #f8fafc;
    --ess-progress-track: rgba(255, 255, 255, 0.05);
  }

  .theme-dark .ess__quiz,
  .theme-dark .ess__results {
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
  }

  .theme-dark .ess__score-circle {
    background: rgba(15, 23, 42, 0.5);
  }

  .theme-dark .ess__score-num {
    background: linear-gradient(135deg, #fff 0%, var(--ess-primary) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .theme-dark .ess__option:hover {
    background: rgba(59, 130, 246, 0.1);
  }

  
  @media (max-width: 768px) {
    .ess__quiz,
    .ess__results {
      padding: 2rem 1.5rem;
      border-radius: 1.75rem;
    }

    .ess__question-text {
      font-size: 1.6rem;
    }

    .ess__options {
      grid-template-columns: 1fr;
      gap: 0.875rem;
    }

    .ess__option {
      padding: 1.25rem;
    }

    .ess__score-circle {
      width: 170px;
      height: 170px;
      border-width: 6px;
    }

    .ess__score-num {
      font-size: 3.5rem;
    }
  }