.mt-root {
    --mt-card-bg: #fff;
    --mt-border: #e2e8f0;
    --mt-text: #1e293b;
    --mt-muted: #64748b;
    --mt-accent: #6366f1;
    --mt-accent-bg: rgba(99, 102, 241, 0.08);
    --mt-input-bg: #f8fafc;
    --mt-input-border: #e2e8f0;
    --mt-calc-bg: rgba(99, 102, 241, 0.05);
    --mt-calc-border: rgba(99, 102, 241, 0.15);
    --mt-preview-bg: #f8fafc;
    --mt-base-color: #6366f1;
    --mt-btn-bg: #4f46e5;
    --mt-btn-hover: #4338ca;
    --mt-feedback-color: #059669;
  }

  .theme-dark .mt-root {
    --mt-card-bg: #1e293b;
    --mt-border: #334155;
    --mt-text: #f1f5f9;
    --mt-muted: #94a3b8;
    --mt-input-bg: #0f172a;
    --mt-input-border: #475569;
    --mt-calc-bg: rgba(99, 102, 241, 0.1);
    --mt-calc-border: rgba(99, 102, 241, 0.25);
    --mt-preview-bg: rgba(15, 23, 42, 0.5);
    --mt-base-color: #818cf8;
    --mt-btn-bg: #4f46e5;
    --mt-btn-hover: #6366f1;
    --mt-feedback-color: #34d399;
  }

  .mt-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
  }

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

  .mt-card {
    background: var(--mt-card-bg);
    border: 1px solid var(--mt-border);
    border-radius: 1rem;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    overflow: hidden;
  }

  .mt-card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--mt-border);
  }

  .mt-card-header-preview {
    background: rgba(236, 72, 153, 0.04);
  }

  .theme-dark .mt-card-header-preview {
    background: rgba(236, 72, 153, 0.08);
  }

  .mt-card-title {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--mt-text);
    margin: 0;
  }

  .mt-card-body {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .mt-preview-body {
    flex: 1;
  }

  .mt-card-preview {
    display: flex;
    flex-direction: column;
  }

  .mt-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--mt-text);
    margin-bottom: 0.5rem;
  }

  .mt-input-wrap {
    position: relative;
  }

  .mt-input,
  .mt-select {
    display: block;
    width: 100%;
    padding: 0.625rem 0.75rem;
    background: var(--mt-input-bg);
    border: 1px solid var(--mt-input-border);
    border-radius: 0.625rem;
    color: var(--mt-text);
    font-size: 0.875rem;
    box-sizing: border-box;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
    transition: border-color 0.15s, box-shadow 0.15s;
  }

  .mt-input {
    padding-right: 2.5rem;
  }

  .mt-input:focus,
  .mt-select:focus {
    outline: 2px solid var(--mt-accent);
    outline-offset: 2px;
    border-color: var(--mt-accent);
  }

  .mt-input-suffix {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.875rem;
    color: var(--mt-muted);
    pointer-events: none;
  }

  .mt-hint {
    margin: 0.375rem 0 0;
    font-size: 0.75rem;
    color: var(--mt-muted);
  }

  .mt-calc-box {
    background: var(--mt-calc-bg);
    border: 1px solid var(--mt-calc-border);
    border-radius: 0.75rem;
    padding: 1rem;
  }

  .mt-calc-title {
    font-size: 0.6875rem;
    font-weight: 700;
    color: var(--mt-accent);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0 0 0.75rem;
  }

  .mt-scale-list {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
  }

  .mt-scale-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.8125rem;
    color: var(--mt-muted);
    padding: 0.125rem 0;
  }

  .mt-scale-base {
    color: var(--mt-base-color);
    font-weight: 700;
    background: var(--mt-accent-bg);
    border-radius: 0.25rem;
    padding: 0.125rem 0.375rem;
    margin: 0 -0.375rem;
  }

  .mt-preview-scroll-wrap {
    background: var(--mt-preview-bg);
    border: 1px solid var(--mt-border);
    border-radius: 0.75rem;
    height: 18rem;
    overflow: hidden;
    position: relative;
  }

  .mt-preview-scroll {
    position: absolute;
    inset: 0;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
  }

  .mt-preview-scroll::-webkit-scrollbar {
    width: 6px;
  }

  .mt-preview-scroll::-webkit-scrollbar-track {
    background: transparent;
  }

  .mt-preview-scroll::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.3);
    border-radius: 9999px;
  }

  .mt-prev-item {
    border-bottom: 1px solid var(--mt-border);
    padding-bottom: 1rem;
  }

  .mt-prev-meta {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
    margin-bottom: 0.25rem;
    font-size: 0.75rem;
    color: var(--mt-muted);
  }

  .mt-prev-text {
    font-weight: 700;
    color: var(--mt-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin: 0;
  }

  .mt-sub {
    color: var(--mt-muted);
    margin: 0.25rem 0 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    line-height: 1.4;
  }

  .mt-copy-section {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .mt-copy-btn {
    width: 100%;
    padding: 0.75rem 1.5rem;
    background: var(--mt-btn-bg);
    color: #fff;
    border: none;
    border-radius: 0.75rem;
    font-size: 0.875rem;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
    transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  }

  .mt-copy-btn:hover {
    background: var(--mt-btn-hover);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.4);
  }

  .mt-copy-btn:active {
    transform: scale(0.98);
  }

  .mt-feedback {
    text-align: center;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--mt-feedback-color);
    opacity: 0;
    transition: opacity 0.3s;
    margin: 0;
  }