.sc-root {
    --sc-accent: #f97316;
    --sc-accent-hover: #ea580c;
    --sc-bg-surface: #fff;
    --sc-bg-input: #f8fafc;
    --sc-border: #e2e8f0;
    --sc-text-main: #1e293b;
    --sc-text-dim: #64748b;
    --sc-text-on-accent: #fff;
    --sc-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --sc-advice-bg: #fff7ed;
    --sc-advice-border: #ffedd5;
    --sc-advice-text: #9a3412;
    --sc-root-bg: #fff;
    --sc-root-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.05);

    padding: 2.5rem;
    background: var(--sc-root-bg);
    border: 1px solid var(--sc-border);
    border-radius: 2.5rem;
    box-shadow: var(--sc-root-shadow);
    max-width: 1000px;
    margin: 0 auto;
  }

  .theme-dark .sc-root {
    --sc-bg-surface: rgba(255, 255, 255, 0.03);
    --sc-bg-input: #0f172a;
    --sc-border: rgba(255, 255, 255, 0.1);
    --sc-text-main: #f1f5f9;
    --sc-text-dim: #94a3b8;
    --sc-advice-bg: rgba(249, 115, 22, 0.1);
    --sc-advice-border: rgba(249, 115, 22, 0.2);
    --sc-advice-text: #fdba74;
    --sc-root-bg: rgba(15, 23, 42, 0.6);
    --sc-root-shadow: 0 20px 50px -10px rgba(0, 0, 0, 0.3);
    
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
  }

  .shrinkage-calculator {
    color: var(--sc-text-main);
  }

  .calculator-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2rem;
    background: var(--sc-bg-input);
    padding: 0.5rem;
    border-radius: 0.75rem;
    border: 1px solid var(--sc-border);
  }

  .tab-button {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    background: transparent;
    color: var(--sc-text-dim);
    font-weight: 600;
    cursor: pointer;
    border-radius: 0.5rem;
    transition: all 0.2s;
  }

  .tab-button:hover {
    color: var(--sc-text-main);
  }

  .tab-button.active {
    background: var(--sc-bg-surface);
    color: var(--sc-accent);
    box-shadow: var(--sc-shadow);
  }

  .calculator-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }

  @media (max-width: 768px) {
    .calculator-grid {
      grid-template-columns: 1fr;
    }
  }

  .settings-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .form-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .margin-top {
    margin-top: 0.5rem;
  }

  .form-label {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--sc-text-dim);
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .small-label {
    font-weight: 400;
    opacity: 0.8;
  }

  .material-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(70px, 1fr));
    gap: 0.5rem;
  }

  .material-choice {
    padding: 0.5rem;
    background: var(--sc-bg-input);
    border: 1px solid var(--sc-border);
    border-radius: 0.5rem;
    color: var(--sc-text-main);
    font-size: 0.75rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
  }

  .material-choice:hover {
    border-color: var(--sc-accent);
    color: var(--sc-accent);
  }

  .material-choice.active {
    background: var(--sc-accent);
    border-color: var(--sc-accent);
    color: var(--sc-text-on-accent);
  }

  .numeric-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--sc-bg-input);
    border: 2px solid var(--sc-border);
    border-radius: 0.75rem;
    color: var(--sc-text-main);
    font-size: 1.125rem;
    font-weight: 600;
    transition: all 0.2s;
  }

  .numeric-input:focus {
    outline: none;
    border-color: var(--sc-accent);
    background: var(--sc-bg-surface);
  }

  .numeric-input.read-only {
    background: transparent;
    border-style: dashed;
    cursor: default;
  }

  .axes-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
  }

  .axis-input-box {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .axis-label {
    font-size: 0.75rem;
    font-weight: 800;
    color: var(--sc-accent);
  }

  .warning-note {
    font-size: 0.75rem;
    color: var(--sc-text-dim);
    font-style: italic;
    margin-top: 0.5rem;
  }

  .advice-box {
    padding: 1.25rem;
    background: var(--sc-advice-bg);
    border: 1px solid var(--sc-advice-border);
    border-radius: 1rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
  }

  .advice-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 800;
    color: var(--sc-advice-text);
  }

  .advice-content {
    font-size: 0.875rem;
    line-height: 1.5;
    color: var(--sc-advice-text);
    margin: 0;
  }

  .display-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .preview-area {
    aspect-ratio: 16/9;
    background: var(--sc-bg-input);
    border-radius: 1.25rem;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--sc-border);
  }

  .cube-scene {
    position: relative;
    width: 80px;
    height: 80px;
    perspective: 400px;
    transform: rotateX(-30deg) rotateY(45deg);
    transform-style: preserve-3d;
  }

  .ghost-cube, .solid-cube {
    position: absolute;
    inset: 0;
    transform-style: preserve-3d;
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .face, .ghost-face {
    position: absolute;
    width: 80px;
    height: 80px;
    border: 1px solid;
  }

  .ghost-face {
    background: rgba(148, 163, 184, 0.05);
    border-color: var(--sc-border);
    border-style: dashed;
  }

  .face {
    background: rgba(249, 115, 22, 0.2);
    border-color: var(--sc-accent);
  }

  .f-front  { transform: rotateY(0deg) translateZ(40px); }
  .f-back   { transform: rotateY(180deg) translateZ(40px); }
  .f-right  { transform: rotateY(90deg) translateZ(40px); }
  .f-left   { transform: rotateY(-90deg) translateZ(40px); }
  .f-top    { transform: rotateX(90deg) translateZ(40px); }
  .f-bottom { transform: rotateX(-90deg) translateZ(40px); }

  .summary-card {
    background: var(--sc-bg-surface);
    border: 2px solid var(--sc-border);
    border-radius: 1.25rem;
    padding: 1.5rem;
    box-shadow: var(--sc-shadow);
  }

  .summary-entry {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    padding: 1rem 0;
  }

  .summary-entry:first-child { padding-top: 0; }
  .summary-entry:last-child { padding-bottom: 0; }
  .border-top { border-top: 1px solid var(--sc-border); }

  .summary-title {
    font-size: 0.625rem;
    font-weight: 800;
    color: var(--sc-text-dim);
    letter-spacing: 0.05em;
  }

  .summary-value {
    font-size: 1.5rem;
    font-weight: 900;
  }

  .summary-value.highlight {
    font-size: 2.25rem;
    color: var(--sc-accent);
  }

  .action-btn {
    padding: 1rem;
    background: var(--sc-accent);
    color: var(--sc-text-on-accent);
    border: none;
    border-radius: 1rem;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
  }

  .action-btn:hover {
    background: var(--sc-accent-hover);
    transform: translateY(-2px);
  }

  .action-btn:active {
    transform: translateY(0);
  }

  .hidden { display: none; }