.fabric-calculator-card {
    --f-p: #4f46e5;
    --f-a: #818cf8;
    --f-side: rgba(79, 70, 229, 0.04);

    display: grid;
    grid-template-columns: 360px 1fr;
    max-width: 1200px;
    width: 95%;
    margin: 2rem auto;
    background: var(--bg-surface);
    backdrop-filter: blur(25px);
    border-radius: 32px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: 0 40px 100px rgba(0, 0, 0, 0.15);
    color: var(--text-main);
  }

  .theme-dark .fabric-calculator-card {
    --f-side: rgba(255, 255, 255, 0.03);
  }

  .fabric-sidebar {
    background: var(--f-side);
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    border-right: 1px solid var(--border-color);
  }

  .config-group {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
  }

  .config-group h3 {
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.18rem;
    color: var(--f-p);
    margin: 0;
  }

  .fabric-field {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .fabric-field label {
    font-size: 0.72rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.06rem;
    color: var(--text-muted);
  }

  .fabric-select {
    width: 100%;
    padding: 0.85rem 3rem 0.85rem 1.1rem;
    border-radius: 14px;
    border: 1.5px solid var(--border-color);
    background: var(--bg-surface);
    font-size: 0.875rem;
    font-weight: 700;
    color: inherit;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234F46E5' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
  }

  .fabric-select:focus {
    border-color: var(--f-p);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
  }

  .shop-stepper {
    display: grid;
    grid-template-columns: 48px 1fr 48px;
    align-items: center;
    background: var(--bg-surface);
    border-radius: 14px;
    border: 1.5px solid var(--border-color);
    overflow: hidden;
    height: 50px;
    max-width: 190px;
  }

  .step-btn {
    height: 100%;
    border: none;
    background: transparent;
    color: var(--f-p);
    font-size: 1.6rem;
    font-weight: 300;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.15s, color 0.15s;
    flex-shrink: 0;
  }

  .step-btn:hover {
    background: var(--f-p);
    color: white;
  }

  .fabric-input {
    width: 100%;
    height: 100%;
    border: none;
    background: transparent;
    text-align: center;
    font-size: 1rem;
    font-weight: 800;
    color: inherit;
    padding: 0;
    outline: none;
    box-shadow: none;
  }

  .preset-group {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
  }

  .preset-pill {
    padding: 0.75rem 0;
    border-radius: 12px;
    border: 1.5px solid rgba(79, 70, 229, 0.25);
    background: rgba(79, 70, 229, 0.06);
    font-size: 0.72rem;
    font-weight: 900;
    color: var(--f-p);
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
  }

  .theme-dark .preset-pill {
    background: rgba(79, 70, 229, 0.08);
    border-color: rgba(129, 140, 248, 0.3);
    color: var(--f-a);
  }

  .preset-pill:hover {
    background: rgba(79, 70, 229, 0.12);
    border-color: var(--f-p);
  }

  .preset-pill.active {
    background: var(--f-p);
    color: white;
    border-color: var(--f-p);
    box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
  }

  .btn-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: auto;
    padding-top: 1rem;
  }

  .f-btn {
    height: 50px;
    border-radius: 14px;
    font-size: 0.85rem;
    font-weight: 800;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
  }

  .f-seco {
    background: var(--bg-muted);
    color: var(--text-muted);
    border: 1.5px solid var(--border-color);
  }

  .f-seco:hover {
    filter: brightness(0.95);
  }

  .f-prim {
    background: var(--f-p);
    color: white;
  }

  .f-prim:hover {
    filter: brightness(1.1);
  }

  .fabric-main {
    padding: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    min-width: 0;
  }

  .magic-result-area {
    background: linear-gradient(145deg, rgba(79, 70, 229, 0.07), rgba(129, 140, 248, 0.03));
    padding: 2.5rem 2rem;
    border-radius: 28px;
    border: 1px solid rgba(79, 70, 229, 0.12);
  }

  .result-lbl {
    display: block;
    font-size: 0.68rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.12rem;
    color: var(--text-muted);
    margin-bottom: 0.4rem;
  }

  .magic-result-area .val {
    font-size: 6rem;
    font-weight: 950;
    letter-spacing: -5px;
    color: var(--f-p);
    line-height: 0.85;
  }

  .magic-result-area .unit {
    font-size: 1.75rem;
    font-weight: 900;
    opacity: 0.4;
    margin-left: 0.5rem;
  }

  .advice-tag {
    display: inline-flex;
    align-items: center;
    margin-top: 1.5rem;
    padding: 0.85rem 2rem;
    background: rgba(79, 70, 229, 0.1);
    border: 1.5px solid rgba(79, 70, 229, 0.22);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 800;
    color: var(--f-p);
  }

  .theme-dark .advice-tag {
    background: rgba(129, 140, 248, 0.12);
    border-color: rgba(129, 140, 248, 0.25);
    color: var(--f-a);
  }

  .layout-container {
    min-width: 0;
  }

  .canvas-wrapper {
    background: var(--bg-muted);
    padding: 24px 24px 14px 12px;
    border-radius: 28px;
  }

  .scheme-area {
    display: flex;
    align-items: stretch;
    gap: 10px;
  }

  .ruler {
    width: 34px;
    flex-shrink: 0;
    position: relative;
  }

  .ruler-mark {
    position: absolute;
    left: 0;
    right: 0;
    display: flex;
    align-items: flex-start;
    transform: translateY(-50%);
  }

  .ruler-mark::before {
    content: '';
    width: 8px;
    height: 1.5px;
    background: var(--text-muted);
    flex-shrink: 0;
    margin-top: 0.42em;
    margin-right: 4px;
  }

  .ruler-mark span {
    font-size: 0.58rem;
    font-weight: 700;
    color: var(--text-muted);
    white-space: nowrap;
  }

  .fabric-board {
    flex: 1;
    height: 300px;
    background: var(--bg-surface);
    border: 2.5px solid var(--f-p);
    padding: 6px 6px 28px;
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.09);
    display: flex;
    flex-direction: column;
    gap: 4px;
    position: relative;
    overflow: hidden;
    border-radius: 4px;
  }

  .piece-row {
    display: flex;
    flex-direction: row;
    gap: 4px;
    flex-shrink: 0;
    align-items: stretch;
  }

  .piece-block {
    border-radius: 4px;
    border: 1.5px solid;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    padding: 4px 8px;
    overflow: hidden;
    min-width: 0;
    transition: filter 0.15s;
  }

  .piece-block:hover {
    filter: brightness(1.08);
  }

  .piece-name {
    font-size: 0.62rem;
    font-weight: 800;
    color: var(--text-main);
    line-height: 1.2;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    width: 100%;
  }

  .piece-fold {
    border-left: 3px dashed rgba(79, 70, 229, 0.65);
  }

  .fold-indicator {
    font-size: 0.48rem;
    font-weight: 800;
    color: rgba(79, 70, 229, 0.75);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-top: 2px;
  }

  .board-empty-state {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    padding: 2rem;
  }

  .scheme-info {
    font-size: 0.68rem;
    font-weight: 700;
    color: var(--text-muted);
    margin-top: 0.6rem;
    text-align: right;
  }

  .merch-section {
    min-width: 0;
  }

  .merch-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--border-color);
  }

  .merch-title {
    font-size: 0.7rem;
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.18rem;
    color: var(--f-p);
    margin: 0;
  }

  .copy-list-btn {
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--f-p);
    background: rgba(79, 70, 229, 0.08);
    border: 1px solid rgba(79, 70, 229, 0.2);
    border-radius: 8px;
    padding: 0.35rem 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
  }

  .copy-list-btn:hover {
    background: rgba(79, 70, 229, 0.15);
  }

  .merceria-checklist {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
  }

  .merch-item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-main);
  }

  .merch-dot {
    color: var(--f-p);
    font-size: 0.5rem;
    flex-shrink: 0;
    opacity: 0.65;
  }

  .warning-banner {
    display: none;
    background: #fff7ed;
    color: #c2410c;
    border: 1.5px solid #fed7aa;
    padding: 1rem 1.25rem;
    border-radius: 16px;
    font-size: 0.85rem;
    font-weight: 600;
  }

  @media (max-width: 1100px) {
    .fabric-calculator-card {
      grid-template-columns: 1fr;
      width: 100%;
      border-radius: 1rem;
      margin: 0;
    }

    .fabric-sidebar {
      border-right: none;
      border-bottom: 1px solid var(--border-color);
      padding: 1.75rem 1.5rem;
    }

    .btn-actions {
      margin-top: 1rem;
    }

    .fabric-main {
      padding: 2rem 1.5rem;
      gap: 2rem;
    }

    .magic-result-area .val {
      font-size: 4.5rem;
      letter-spacing: -3px;
    }
  }

  @media (max-width: 600px) {
    .fabric-sidebar {
      padding: 1.25rem;
    }

    .fabric-main {
      padding: 1.25rem;
      gap: 1.5rem;
    }

    .magic-result-area {
      padding: 1.5rem 1.25rem;
      border-radius: 1rem;
    }

    .magic-result-area .val {
      font-size: 3rem;
      letter-spacing: -2px;
    }

    .magic-result-area .unit {
      font-size: 1.2rem;
    }

    .advice-tag {
      font-size: 0.875rem;
      padding: 0.7rem 1.25rem;
    }

    .canvas-wrapper {
      padding: 14px 14px 10px 8px;
      border-radius: 16px;
    }

    .fabric-board {
      height: 220px;
      padding-bottom: 20px;
    }
  }