.under-keel-calculator {
    --n-bg: #fff;
    --n-bg-muted: #f1f5f9;
    --n-text: #0f172a;
    --n-text-muted: #475569;
    --n-text-dim: #64748b;
    --n-border: #e2e8f0;
    --n-shadow: rgba(0, 0, 0, 0.05);
    --n-primary: #3b82f6;
    --n-primary-on: #fff;
    --n-accent: #6366f1;
    --n-cyan: #0891b2;
    --n-success: #10b981;
    --n-warning: #f59e0b;
    --n-error: #f43f5e;
    --ukc-label-size: 0.75rem;
    --ukc-label-weight: 800;
    --ukc-label-spacing: 0.06em;

    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 1000px;
    margin: 0 auto;
  }

  .theme-dark .under-keel-calculator {
    --n-bg: #0f172a;
    --n-bg-muted: #1e293b;
    --n-text: #f8fafc;
    --n-text-muted: #94a3b8;
    --n-text-dim: #64748b;
    --n-border: #334155;
    --n-shadow: rgba(0, 0, 0, 0.3);
    --n-primary: #60a5fa;
    --n-primary-on: #fff;
    --n-accent: #818cf8;
    --n-cyan: #22d3ee;
    --n-success: #34d399;
    --n-warning: #fbbf24;
    --n-error: #fb7185;
  }

  .ukc-main-card {
    background: var(--n-bg);
    border: 1px solid var(--n-border);
    border-radius: 2rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    overflow: hidden;
    box-shadow: 0 20px 40px var(--n-shadow);
  }

  @media (max-width: 850px) {
    .ukc-main-card {
      grid-template-columns: 1fr;
    }
  }

  .ukc-calc-sidebar {
    background: var(--n-primary);
    color: var(--n-primary-on);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
  }

  .ukc-sidebar-header h3 {
    font-size: 1.1rem;
    margin: 0;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.9;
  }

  .ukc-input-set {
    display: flex;
    flex-direction: column;
    gap: 1.2rem;
  }

  .ukc-input-block {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
  }

  .ukc-input-block label {
    font-size: var(--ukc-label-size);
    font-weight: var(--ukc-label-weight);
    color: var(--n-primary-on);
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: var(--ukc-label-spacing);
  }

  .ukc-unit-input {
    position: relative;
    display: flex;
    align-items: center;
  }

  .ukc-unit-input input {
    width: 100%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.8rem;
    padding: 0.7rem 2.5rem 0.7rem 1rem;
    color: var(--n-primary-on);
    font-size: 1rem;
    outline: none;
  }

  .ukc-unit-input span {
    position: absolute;
    right: 12px;
    font-size: 0.85rem;
    font-weight: 700;
    opacity: 0.6;
  }

  .ukc-hr-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0.5rem 0;
  }

  .ukc-row {
    display: flex;
    gap: 0.5rem;
  }

  .under-keel-calculator input[type='time'],
  .under-keel-calculator input[type='number'] {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 0.8rem;
    padding: 0.7rem;
    color: var(--n-primary-on);
    font-size: 1rem;
    outline: none;
  }

  .ukc-mini-num {
    width: 80px;
  }

  .ukc-calc-content {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    background: var(--n-bg-muted);
  }

  .ukc-top-row {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
  }

  .ukc-result-display {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
  }

  .ukc-result-display .label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--n-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  .ukc-time-range {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--n-text);
    line-height: 1;
  }

  .ukc-arrow-sep {
    color: var(--n-cyan);
    opacity: 0.4;
  }

  .ukc-status-indicator {
    padding: 0.4rem 1.2rem;
    border-radius: 2rem;
    font-size: 0.9rem;
    font-weight: 700;
    width: fit-content;
    background: var(--n-bg-muted);
    color: var(--n-text-dim);
  }

  .ukc-status-indicator.success {
    background: color-mix(in srgb, var(--n-success), transparent 80%);
    color: var(--n-success);
  }

  .ukc-status-indicator.warning {
    background: color-mix(in srgb, var(--n-warning), transparent 80%);
    color: var(--n-warning);
  }

  .ukc-status-indicator.danger {
    background: color-mix(in srgb, var(--n-error), transparent 80%);
    color: var(--n-error);
  }

  .ukc-data-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
  }

  .ukc-stat-pill {
    background: var(--n-bg);
    padding: 0.5rem 1rem;
    border-radius: 0.8rem;
    border: 1px solid var(--n-border);
    display: flex;
    justify-content: space-between;
    gap: 2rem;
    font-size: 0.9rem;
  }

  .ukc-stat-pill span {
    color: var(--n-text-muted);
    font-weight: 500;
  }

  .ukc-stat-pill strong {
    color: var(--n-text);
    font-weight: 700;
  }

  .ukc-visual-container {
    background: var(--n-bg);
    border: 1px solid var(--n-border);
    border-radius: 1.5rem;
    padding: 2rem;
    height: 300px;
    display: flex;
    justify-content: center;
    position: relative;
  }

  .ukc-ocean-frame {
    width: 200px;
    height: 100%;
    background: var(--n-bg-muted);
    border: 4px solid var(--n-border);
    border-radius: 1rem;
    position: relative;
    overflow: hidden;
  }

  .ukc-water-volume {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: linear-gradient(to top, var(--n-primary), var(--n-cyan));
    opacity: 0.6;
    transition: height 0.6s ease;
  }

  .ukc-surface-line {
    position: absolute;
    top: 0;
    width: 100%;
    height: 3px;
    background: var(--n-cyan);
  }

  .ukc-ship-silhouette {
    position: absolute;
    left: 20px;
    right: 20px;
    height: 30px;
    color: var(--n-text);
    z-index: 10;
    transition: bottom 0.6s ease;
  }

  .ukc-sand-bottom {
    position: absolute;
    bottom: 0;
    width: 100%;
    height: 40px;
    background: color-mix(in srgb, var(--n-warning), transparent 40%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    font-weight: 800;
    color: var(--n-text);
    letter-spacing: 0.2em;
    z-index: 5;
  }

  @media (max-width: 640px) {
    .ukc-time-range {
      font-size: 2.2rem;
    }

    .ukc-top-row {
      flex-direction: column;
      gap: 2rem;
    }
  }