* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    
    body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #000;
      color: #fff;
      min-height: 100vh;
      padding: 24px;
    }
    
    .container {
      max-width: 1024px;
      margin: 0 auto;
    }
    
    .calculator {
      background: #171717;
      border-radius: 16px;
      border: 1px solid rgba(127, 29, 29, 0.5);
      overflow: hidden;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    
    .header {
      background: linear-gradient(to right, #7f1d1d, #991b1b);
      padding: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }
    
    .header-left {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    
    .header-title {
      font-size: 28px;
      font-weight: bold;
      color: #fecaca;
    }
    
    .header-subtitle {
      color: #fca5a5;
      font-size: 14px;
      margin-top: 4px;
    }
    
    .update-btn {
      background: rgba(127, 29, 29, 0.5);
      color: #fecaca;
      border: none;
      padding: 10px 16px;
      border-radius: 8px;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: background 0.2s;
    }
    
    .update-btn:hover:not(:disabled) {
      background: rgba(185, 28, 28, 0.5);
    }
    
    .update-btn:disabled {
      opacity: 0.5;
      cursor: not-allowed;
    }
    
    .status-bar {
      padding: 12px 24px;
      background: #0a0a0a;
      border-bottom: 1px solid rgba(127, 29, 29, 0.3);
      display: flex;
      justify-content: space-between;
      font-size: 14px;
      color: #fca5a5;
    }
    
    .instrument-section {
      padding: 24px;
      background: #0a0a0a;
      border-bottom: 1px solid rgba(127, 29, 29, 0.3);
    }
    
    .instrument-label {
      display: block;
      color: #fca5a5;
      font-weight: 500;
      margin-bottom: 8px;
    }
    
    .select, .input {
      width: 100%;
      background: #171717;
      border: 1px solid rgba(127, 29, 29, 0.5);
      border-radius: 8px;
      padding: 12px 16px;
      color: #fecaca;
      font-size: 14px;
    }
    
    .select:focus, .input:focus {
      outline: none;
      ring: 2px solid #dc2626;
    }
    
    .instrument-info {
      display: flex;
      justify-content: space-between;
      margin-top: 8px;
      font-size: 14px;
      color: #fca5a5;
    }
    
    .tabs {
      display: flex;
      overflow-x: auto;
      background: #0a0a0a;
      border-bottom: 1px solid rgba(127, 29, 29, 0.3);
    }
    
    .tab {
      padding: 16px 24px;
      background: none;
      border: none;
      color: #f87171;
      cursor: pointer;
      white-space: nowrap;
      transition: all 0.2s;
      border-bottom: 2px solid transparent;
    }
    
    .tab:hover {
      color: #fca5a5;
      background: #171717;
    }
    
    .tab.active {
      background: #7f1d1d;
      color: #fecaca;
      border-bottom-color: #dc2626;
    }
    
    .content {
      padding: 24px;
    }
    
    .tab-content {
      display: none;
    }
    
    .tab-content.active {
      display: block;
    }
    
    .form-group {
      margin-bottom: 24px;
    }

    .form-row {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }

    .form-row .form-group {
      flex: 1;
      margin-bottom: 0;
    }
    
    .label {
      display: block;
      color: #fca5a5;
      font-weight: 500;
      margin-bottom: 8px;
    }
    
    .direction-btns {
      display: flex;
      gap: 16px;
    }
    
    .direction-btn {
      flex: 1;
      padding: 12px;
      border-radius: 8px;
      border: none;
      font-weight: 500;
      cursor: pointer;
      transition: background 0.2s;
      background: #171717;
      color: #fca5a5;
    }
    
    .direction-btn.active {
      background: #7f1d1d;
      color: #fecaca;
    }
    
    .result-box {
      background: linear-gradient(to right, #450a0a, #7f1d1d);
      border: 1px solid rgba(127, 29, 29, 0.5);
      border-radius: 8px;
      padding: 24px;
      margin-top: 24px;
    }
    
    .result-label {
      color: #fca5a5;
      font-size: 14px;
      margin-bottom: 8px;
    }
    
    .result-value {
      font-size: 36px;
      font-weight: bold;
      color: #fecaca;
    }
    
    .info-box {
      margin-top: 24px;
      background: #171717;
      border: 1px solid rgba(127, 29, 29, 0.5);
      border-radius: 8px;
      padding: 24px;
    }
    
    .info-title {
      color: #fecaca;
      font-weight: bold;
      margin-bottom: 12px;
      font-size: 16px;
    }
    
    .info-text {
      color: #fca5a5;
      font-size: 14px;
      line-height: 1.6;
    }
    
    .spin {
      animation: spin 1s linear infinite;
    }
    
    @keyframes spin {
      from { transform: rotate(0deg); }
      to { transform: rotate(360deg); }
    }
    
    .warning-box {
      background: #450a0a;
      border: 1px solid rgba(127, 29, 29, 0.5);
      border-radius: 8px;
      padding: 24px;
      color: #fca5a5;
    }