:root {
      --color-teal-primary: #1DB88D;
      --color-teal-hover: #17a67d;
      --color-orange-accent: #FFC000;
      --color-gold-accent: #d4af37;
      --color-gold-hover: #e5c158;
      --color-background: #FFFFFF;
      --color-surface: #FFFFFF;
      --color-secondary-bg: #F5F5F5;
      --color-tertiary-bg: #F8F9FA;
      --color-text: #1A1A1A;
      --color-text-secondary: #666666;
      --color-text-light: #888888;
      --color-border: #E0E0E0;
      --color-primary: var(--color-teal-primary);
      --color-primary-hover: var(--color-teal-hover);
      --color-success: #10B981;
      --color-error: #EF4444;
      --color-warning: #FFC000;
      --color-info: #3B82F6;
      --color-dark-bg: #22262e;
      --color-dark-surface: #2a3142;
      --color-dark-sidebar: #2a3142;
      --color-dark-text: #FFFFFF;
      --color-dark-text-secondary: #B0B0B0;
      --color-dark-border: #3a4452;
      --font-family: 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      --font-size-xs: 12px; --font-size-sm: 14px; --font-size-base: 16px;
      --font-size-lg: 18px; --font-size-xl: 20px; --font-size-2xl: 24px; --font-size-3xl: 32px;
      --space-xs: 4px; --space-sm: 8px; --space-md: 12px; --space-lg: 16px;
      --space-xl: 24px; --space-2xl: 32px; --space-3xl: 48px;
      --radius-sm: 6px; --radius-md: 8px; --radius-lg: 12px; --radius-xl: 16px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.1); --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
      --sidebar-width: 300px; --sidebar-collapsed-width: 100px; --header-height: 74px;
    }
    [data-theme="dark"] {
      --color-background: var(--color-dark-bg); --color-surface: var(--color-dark-surface);
      --color-secondary-bg: var(--color-dark-sidebar); --color-tertiary-bg: var(--color-dark-bg);
      --color-text: var(--color-dark-text); --color-text-secondary: var(--color-dark-text-secondary);
      --color-border: var(--color-dark-border);
      --color-primary: var(--color-gold-accent); --color-primary-hover: var(--color-gold-hover);
    }
    
    body { font-family: var(--font-family); font-size: var(--font-size-base); line-height: 1.5; color: var(--color-text); background: var(--color-background); transition: background 250ms, color 250ms; zoom: 0.8; }
    .app-container { display: flex; flex-direction: column; min-height: 100vh; }
    .page-wrapper { display: flex; flex: 1; overflow: hidden; }
    .main-content { flex: 1; padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl); overflow-y: auto; }
    .content-wrapper { max-width: 1400px; margin: 0 auto; }
    .page-header { margin-bottom: var(--space-2xl); }
    .page-title { font-size: var(--font-size-3xl); font-weight: 700; color: var(--color-text); margin-bottom: var(--space-sm); }
    .page-description { font-size: var(--font-size-base); color: var(--color-text-secondary); max-width: 800px; }
    .btn { display: inline-flex; align-items: center; gap: var(--space-sm); padding: var(--space-md) var(--space-lg); border-radius: var(--radius-md); font-size: var(--font-size-sm); font-weight: 500; cursor: pointer; transition: all 200ms; border: none; text-decoration: none; white-space: nowrap; }
    
    
    .btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
    .btn-secondary { background: var(--color-secondary-bg); color: var(--color-text); border: 1px solid var(--color-border); }
    .btn-secondary:hover { background: var(--color-tertiary-bg); border-color: var(--color-primary); }
    .btn-sm { padding: var(--space-sm) var(--space-md); font-size: var(--font-size-xs); }
    .btn-lg { padding: var(--space-lg) var(--space-2xl); font-size: var(--font-size-base); }
    .btn-icon { width: 16px; height: 16px; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; fill: none; }
    
    .card-header { font-size: var(--font-size-xl); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-lg); display: flex; justify-content: space-between; align-items: center; }
    .card-title { font-size: var(--font-size-xl); font-weight: 600; color: var(--color-text); }
    .scenario-selector { background: var(--color-secondary-bg); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: var(--space-xl); margin-bottom: var(--space-xl); }
    .scenario-selector-row { display: flex; gap: var(--space-lg); align-items: flex-end; }
    .scenario-field { flex: 1; }
    .scenario-label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-text); margin-bottom: var(--space-sm); display: block; }
    .scenario-select { width: 100%; padding: var(--space-md); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-background); font-size: var(--font-size-base); color: var(--color-text); cursor: pointer; }
    
    
    .form-input { width: 100%; padding: var(--space-md); border: 1px solid var(--color-border); border-radius: var(--radius-md); background: var(--color-background); font-size: var(--font-size-base); color: var(--color-text); font-family: var(--font-family); }
    .form-input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(29,184,141,0.1); }
    .stepper { display: flex; align-items: center; justify-content: center; margin-bottom: var(--space-2xl); padding: var(--space-xl) 0; }
    .stepper-step { display: flex; align-items: center; gap: var(--space-sm); cursor: pointer; }
    .stepper-circle { width: 36px; height: 36px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: var(--font-size-sm); font-weight: 700; border: 2px solid var(--color-border); color: var(--color-text-secondary); background: var(--color-background); transition: all 300ms; }
    .stepper-step.active .stepper-circle { background: var(--color-primary); color: white; border-color: var(--color-primary); }
    .stepper-step.completed .stepper-circle { background: var(--color-success); color: white; border-color: var(--color-success); }
    .stepper-label { font-size: var(--font-size-sm); font-weight: 500; color: var(--color-text-secondary); transition: color 200ms; }
    .stepper-step.active .stepper-label { color: var(--color-primary); font-weight: 600; }
    .stepper-step.completed .stepper-label { color: var(--color-success); }
    .stepper-line { width: 60px; height: 2px; background: var(--color-border); margin: 0 var(--space-md); transition: background 300ms; }
    .stepper-line.completed { background: var(--color-success); }
    .survey-nav { display: flex; justify-content: space-between; align-items: center; margin-top: var(--space-2xl); padding-top: var(--space-xl); border-top: 1px solid var(--color-border); }
    .results-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--space-2xl); flex-wrap: wrap; gap: var(--space-md); }
    .results-actions { display: flex; gap: var(--space-md); align-items: center; }
    .strategy-toggle { display: inline-flex; align-items: center; gap: 6px; padding: 6px 14px; border: 1px solid var(--color-border); border-radius: 20px; background: transparent; font-size: 12px; font-weight: 500; color: var(--color-text-secondary); cursor: pointer; transition: all 200ms; font-family: inherit; }
    .strategy-toggle.active { font-weight: 600; }
    .strategy-toggle:hover { border-color: var(--color-primary); }
    .loading { display: inline-block; width: 16px; height: 16px; border: 2px solid var(--color-border); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 0.6s linear infinite; }
    .loading-lg { width: 32px; height: 32px; border-width: 3px; }
    @keyframes spin { to { transform: rotate(360deg); } }
    .loading-overlay { display: flex; align-items: center; justify-content: center; padding: var(--space-3xl); color: var(--color-text-secondary); gap: var(--space-md); }
    .modal-overlay { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); z-index: 10000; align-items: center; justify-content: center; }
    .modal-overlay.visible { display: flex; }
    @media (max-width: 768px) {
      .stepper-label { display: none; }
      .stepper-line { width: 30px; }
    }