.ss-card {
    --ss-bg: #fff;
    --ss-border: rgba(14, 165, 233, 0.2);
    --ss-shadow: rgba(14, 165, 233, 0.08);
    --ss-sidebar-bg: rgba(240, 249, 255, 0.4);
    --ss-sidebar-border: rgba(14, 165, 233, 0.15);
    --ss-primary: #0ea5e9;
    --ss-primary-hover: #0284c7;
    --ss-primary-soft: rgba(240, 249, 255, 0.8);
    --ss-primary-soft-border: rgba(14, 165, 233, 0.4);
    --ss-toggle-bg: rgba(226, 232, 240, 0.8);
    --ss-toggle-text: #475569;
    --ss-input-border: rgba(14, 165, 233, 0.3);
    --ss-input-bg: #fff;
    --ss-text: #0f172a;
    --ss-text-muted: #475569;
    --ss-text-secondary: #334155;
    --ss-text-label: #334155;
    --ss-surface: #f8fafc;
    --ss-surface-border: #e2e8f0;
    --ss-principal-bg: linear-gradient(135deg, rgba(14,165,233,0.05), rgba(240,249,255,1));
    --ss-principal-border: rgba(14, 165, 233, 0.2);
    --ss-canvas-bg: #fff;
    --ss-canvas-border: rgba(14, 165, 233, 0.15);
    --ss-copy-header: #0284c7;
    --ss-copy-text: #1e293b;
    --ss-hint: #475569;
    --ss-hint-error: #ef4444;

    display: flex;
    flex-direction: column;
    background: var(--ss-bg);
    border-radius: 1.5rem;
    border: 1px solid var(--ss-border);
    box-shadow: 0 10px 40px var(--ss-shadow);
    overflow: hidden;
    margin: 2rem 0;
  }

  .theme-dark .ss-card {
    --ss-bg: #18181b;
    --ss-border: rgba(56, 189, 248, 0.2);
    --ss-shadow: rgba(14, 165, 233, 0.1);
    --ss-sidebar-bg: rgba(39, 39, 42, 0.8);
    --ss-sidebar-border: rgba(56, 189, 248, 0.15);
    --ss-primary: #38bdf8;
    --ss-primary-hover: #0ea5e9;
    --ss-primary-soft: rgba(56, 189, 248, 0.07);
    --ss-primary-soft-border: rgba(56, 189, 248, 0.3);
    --ss-toggle-bg: #27272a;
    --ss-toggle-text: #a1a1aa;
    --ss-input-border: #52525b;
    --ss-input-bg: #3f3f46;
    --ss-text: #f4f4f5;
    --ss-text-muted: #a1a1aa;
    --ss-text-secondary: #d4d4d8;
    --ss-text-label: #d4d4d8;
    --ss-surface: #27272a;
    --ss-surface-border: #3f3f46;
    --ss-principal-bg: linear-gradient(135deg, rgba(56,189,248,0.08), rgba(12,74,110,0.2));
    --ss-principal-border: rgba(56, 189, 248, 0.25);
    --ss-canvas-bg: #27272a;
    --ss-canvas-border: #3f3f46;
    --ss-copy-header: #38bdf8;
    --ss-copy-text: #e4e4e7;
    --ss-hint: #a1a1aa;
    --ss-hint-error: #f87171;
  }

  .ss-sidebar {
    background: var(--ss-sidebar-bg);
    border-bottom: 1px solid var(--ss-sidebar-border);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0;
  }

  @media (min-width: 768px) {
    .ss-card { flex-direction: row; }
    .ss-sidebar {
      width: 320px;
      flex-shrink: 0;
      border-bottom: none;
      border-right: 1px solid var(--ss-sidebar-border);
      gap: 1.5rem;
    }
  }

  .ss-sidebar-heading {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--ss-text);
    margin-bottom: 1.5rem;
  }
  .ss-sidebar-heading [data-icon] {
    color: var(--ss-primary);
    font-size: 1.5em;
  }

  .ss-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1rem;
  }
  .ss-input-group label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--ss-text-label);
    display: flex;
    justify-content: space-between;
  }
  .ss-math {
    font-style: italic;
    font-weight: 600;
    color: var(--ss-text-muted);
  }
  .ss-input-group input,
  .ss-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--ss-input-border);
    background: var(--ss-input-bg);
    color: var(--ss-text);
    font-size: 1rem;
    transition: all 0.2s;
  }
  .ss-input-group input:focus,
  .ss-select:focus {
    outline: none;
    border-color: var(--ss-primary);
    box-shadow: 0 0 0 2px rgba(14, 165, 233, 0.2);
  }
  .ss-hint {
    font-size: 0.75rem;
    color: var(--ss-hint);
    line-height: 1.4;
  }
  .ss-hint-error {
    color: var(--ss-hint-error);
    font-weight: 700;
  }

  .ss-toggle {
    display: flex;
    background: var(--ss-toggle-bg);
    border-radius: 0.75rem;
    padding: 0.25rem;
    gap: 0.25rem;
  }
  .ss-toggle-btn {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border-radius: 0.5rem;
    border: none;
    background: transparent;
    color: var(--ss-toggle-text);
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s ease;
  }
  .ss-toggle-btn.active {
    background: var(--ss-primary);
    color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  }

  .ss-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    gap: 2rem;
  }

  .ss-results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
  }

  @media (min-width: 640px) {
    .ss-results-grid { grid-template-columns: 2fr 1fr; }
  }

  .ss-stat-block {
    background: var(--ss-surface);
    border-radius: 1rem;
    padding: 1.25rem;
    border: 1px solid var(--ss-surface-border);
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .ss-stat-principal {
    background: var(--ss-principal-bg);
    border-color: var(--ss-principal-border);
  }
  .ss-block-title {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--ss-text-secondary);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
  }
  .ss-block-title [data-icon] { color: var(--ss-primary); }
  .ss-stat-main {
    display: flex;
    flex-direction: column;
    align-items: center;
  }
  .ss-stat-big {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1;
    color: var(--ss-primary);
  }
  .ss-stat-sub {
    font-size: 1rem;
    font-weight: 600;
    color: var(--ss-text-muted);
    margin-top: 0.5rem;
  }
  .ss-stat-sec { text-align: center; }
  .ss-stat-medium {
    font-size: 2rem;
    font-weight: 800;
    color: var(--ss-text);
  }

  .ss-copy-block {
    background: var(--ss-primary-soft);
    border: 1px dashed var(--ss-primary-soft-border);
    border-radius: 1rem;
    padding: 1.5rem;
    position: relative;
  }
  .ss-copy-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--ss-copy-header);
    font-weight: 800;
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
  }
  .ss-copy-text {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--ss-copy-text);
    margin: 0;
    font-style: italic;
    font-weight: 500;
  }
  .ss-copy-btn {
    position: absolute;
    bottom: 1rem;
    right: 1.5rem;
    background: var(--ss-primary);
    color: #fff;
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    cursor: pointer;
    transition: background 0.2s;
  }
  .ss-copy-btn:hover { background: var(--ss-primary-hover); }

  .ss-visual {
    background: var(--ss-surface);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--ss-surface-border);
  }
  .ss-chart-desc {
    font-size: 0.85rem;
    color: var(--ss-text-muted);
    margin-top: -1rem;
    margin-bottom: 1rem;
    font-weight: 500;
  }
  #sensitivity-canvas {
    width: 100%;
    height: 250px;
    display: block;
    background: var(--ss-canvas-bg);
    border-radius: 0.75rem;
    padding: 0.5rem;
    border: 1px solid var(--ss-canvas-border);
  }