/* Fahrenheit to Celsius Converter — Custom Styles */

    .converter-card {
      padding: 28px;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-md);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    }

    .converter-card:hover {
      border-color: var(--color-border);
    }

    .converter-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 20px;
      gap: 12px;
      flex-wrap: wrap;
    }

    .converter-direction {
      font-size: 0.82rem;
      font-weight: 600;
      padding: 4px 14px;
      border-radius: 999px;
      background: #f3f0ff;
      color: #8b5cf6;
    }

    .converter-input-group {
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }

    .input-block {
      flex: 1;
      min-width: 180px;
    }

    .input-block label {
      display: block;
      font-size: 0.82rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--color-text-muted);
      margin-bottom: 8px;
    }

    .input-block input[type="number"] {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--color-text);
      background: var(--color-surface);
      transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
      outline: none;
      -moz-appearance: textfield;
    }

    .input-block input[type="number"]::-webkit-inner-spin-button,
    .input-block input[type="number"]::-webkit-outer-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }

    .input-block input[type="number"]:focus {
      border-color: #8b5cf6;
      box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
    }

    .input-block input[type="number"]::placeholder {
      color: var(--color-text-muted);
      font-weight: 400;
    }

    .swap-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 1px solid var(--color-border);
      background: var(--color-surface);
      color: #8b5cf6;
      font-size: 1.2rem;
      cursor: pointer;
      transition: all var(--transition-fast);
      flex-shrink: 0;
      margin-top: 22px;
    }

    .swap-btn:hover {
      background: #f3f0ff;
      border-color: #8b5cf6;
      transform: rotate(180deg);
    }

    .action-row {
      display: flex;
      gap: 10px;
      margin-top: 16px;
      flex-wrap: wrap;
    }

    .btn-copy, .btn-reset {
      padding: 8px 18px;
      border-radius: var(--radius-sm);
      font-family: var(--font-body);
      font-size: 0.85rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid var(--color-border);
      background: var(--color-surface);
      color: var(--color-text-secondary);
      transition: all var(--transition-fast);
    }

    .btn-copy:hover {
      border-color: #8b5cf6;
      color: #8b5cf6;
      background: #f3f0ff;
    }

    .btn-reset:hover {
      border-color: var(--color-error);
      color: var(--color-error);
      background: var(--color-error-bg);
    }

    .btn-copy.copied {
      border-color: var(--color-success);
      color: var(--color-success);
      background: var(--color-success-bg);
    }

    /* Results panel */
    .results-panel {
      margin-top: 20px;
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 12px;
    }

    .result-box {
      padding: 16px;
      background: var(--color-surface);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-sm);
      text-align: center;
    }

    .result-box .result-label {
      font-size: 0.72rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--color-text-muted);
      margin-bottom: 6px;
      display: block;
    }

    .result-box .result-value {
      font-size: 1.35rem;
      font-weight: 700;
      color: #8b5cf6;
      font-family: var(--font-mono);
    }

    .result-box .result-label-tag {
      display: inline-block;
      margin-top: 6px;
      font-size: 0.72rem;
      font-weight: 600;
      padding: 2px 8px;
      border-radius: 999px;
      background: #f3f0ff;
      color: #8b5cf6;
    }

    /* Formula step-by-step */
    .formula-card {
      margin-top: 20px;
      padding: 20px;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-md);
    }

    .formula-card-title {
      font-size: 0.82rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--color-text-muted);
      margin-bottom: 12px;
    }

    .formula-steps {
      font-family: var(--font-mono);
      font-size: 0.9rem;
      color: var(--color-text);
      line-height: 2;
    }

    .formula-steps .step-highlight {
      color: #8b5cf6;
      font-weight: 600;
    }

    /* Thermometer */
    .thermometer-section {
      margin-top: 20px;
    }

    .thermometer-wrap {
      position: relative;
      height: 32px;
      background: linear-gradient(90deg, #3b82f6 0%, #06b6d4 20%, #10b981 35%, #f59e0b 55%, #ef4444 75%, #dc2626 100%);
      border-radius: 999px;
      overflow: hidden;
    }

    .thermometer-marker {
      position: absolute;
      top: -4px;
      width: 3px;
      height: 40px;
      background: var(--color-text);
      border-radius: 2px;
      transition: left var(--transition-base);
      z-index: 2;
    }

    .thermometer-marker::after {
      content: attr(data-label);
      position: absolute;
      bottom: -22px;
      left: 50%;
      transform: translateX(-50%);
      font-size: 0.72rem;
      font-weight: 600;
      color: var(--color-text);
      white-space: nowrap;
      font-family: var(--font-mono);
    }

    .thermometer-labels {
      display: flex;
      justify-content: space-between;
      margin-top: 28px;
      font-size: 0.7rem;
      color: var(--color-text-muted);
      font-weight: 500;
    }

    .thermometer-labels span {
      text-align: center;
    }

    /* Reference table */
    .ref-table-card {
      margin-top: 24px;
      padding: 0;
      background: var(--color-bg);
      border: 1px solid var(--color-border-light);
      border-radius: var(--radius-md);
      overflow: hidden;
    }

    .ref-table-card-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--color-text);
      padding: 16px 20px 12px;
    }

    .ref-table {
      width: 100%;
      border-collapse: collapse;
    }

    .ref-table thead th {
      padding: 10px 16px;
      font-size: 0.75rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      color: var(--color-text-muted);
      background: var(--color-surface);
      border-top: 1px solid var(--color-border-light);
      border-bottom: 1px solid var(--color-border-light);
      text-align: left;
    }

    .ref-table tbody td {
      padding: 10px 16px;
      font-size: 0.88rem;
      color: var(--color-text);
      border-bottom: 1px solid var(--color-border-light);
      font-family: var(--font-mono);
      font-size: 0.85rem;
    }

    .ref-table tbody tr:last-child td {
      border-bottom: none;
    }

    .ref-table tbody tr:hover {
      background: var(--color-surface);
    }

    .ref-table .temp-label {
      font-family: var(--font-body);
      font-size: 0.78rem;
      font-weight: 500;
      color: var(--color-text-muted);
      font-style: italic;
    }

    /* Responsive */
    @media (max-width: 700px) {
      .results-panel {
        grid-template-columns: 1fr;
      }

      .converter-input-group {
        flex-direction: column;
        align-items: stretch;
      }

      .swap-btn {
        margin-top: 0;
        align-self: center;
        transform: rotate(90deg);
      }

      .swap-btn:hover {
        transform: rotate(270deg);
      }

      .input-block {
        min-width: 100%;
      }

      .converter-header {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 480px) {
      .ref-table thead th,
      .ref-table tbody td {
        padding: 8px 10px;
        font-size: 0.78rem;
      }
    }

    /* Print styles */
    @media print {
      .no-print,
      .ad-zone,
      .action-row,
      .swap-btn,
      header,
      footer,
      .related-tools {
        display: none !important;
      }

      .tool-workspace {
        box-shadow: none;
        border: 1px solid #ccc;
      }

      .thermometer-wrap {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
      }
    }