:root {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
      line-height: 1.4;
      color: #111827;
      background: #f3f4f6;
    }
    body {
      margin: 0;
      padding: 1.5rem;
      background: radial-gradient(circle at top left, #e5e7eb, #f9fafb);
    }
    h1 {
      font-size: 1.6rem;
      margin-bottom: 0.5rem;
    }
    h2 {
      font-size: 1.1rem;
      margin-top: 1.5rem;
      margin-bottom: 0.5rem;
    }
    .page {
      max-width: 1150px;
      margin: 0 auto;
    }
    .card {
      background: #ffffff;
      border-radius: 1rem;
      box-shadow: 0 15px 35px rgba(0,0,0,0.08);
      padding: 1.2rem 1.4rem;
      margin-bottom: 1rem;
    }
    .grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 1rem;
    }
    label {
      display: block;
      font-size: 0.85rem;
      font-weight: 600;
      color: #374151;
      margin-bottom: 0.2rem;
    }
    select, input[type="number"] {
      width: 100%;
      padding: 0.4rem 0.5rem;
      border-radius: 0.5rem;
      border: 1px solid #d1d5db;
      font-size: 0.9rem;
      box-sizing: border-box;
    }
    input[type="number"]:focus,
    select:focus {
      outline: none;
      border-color: #6366f1;
      box-shadow: 0 0 0 1px #6366f1;
    }
    .field {
      margin-bottom: 0.7rem;
    }
    .inline-note {
      font-size: 0.75rem;
      color: #6b7280;
    }
    button {
      appearance: none;
      border: none;
      border-radius: 999px;
      padding: 0.55rem 1.4rem;
      font-size: 0.9rem;
      font-weight: 600;
      cursor: pointer;
      background: linear-gradient(135deg, #4f46e5, #3b82f6);
      color: white;
      box-shadow: 0 10px 20px rgba(59,130,246,0.35);
      transition: transform 0.08s ease, box-shadow 0.08s ease;
    }
    button:hover {
      transform: translateY(-1px);
      box-shadow: 0 14px 26px rgba(59,130,246,0.45);
    }
    button:active {
      transform: translateY(0);
      box-shadow: 0 8px 16px rgba(59,130,246,0.3);
    }

    .actions-row {
      margin-top: 0.7rem;
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 0.85rem;
    }
    .governing-chip {
      display: inline-flex;
      align-items: center;
      padding: 0.4rem 0.9rem;
      border-radius: 0.75rem;
      background: #e0e7ff;
      color: #312e81;
      font-weight: 600;
      font-size: 0.85rem;
      min-height: 2.25rem;
      min-width: 220px;
    }

    table {
      width: 100%;
      border-collapse: collapse;
      font-size: 0.8rem;
      margin-top: 0.5rem;
    }
    th, td {
      border: 1px solid #e5e7eb;
      padding: 0.35rem 0.4rem;
      text-align: right;
      white-space: nowrap;
    }
    th {
      background: #f3f4f6;
      font-weight: 600;
    }
    td.label {
      text-align: left;
      font-weight: 500;
      color: #374151;
    }

    #section-diagram-container {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.35rem;
    }
    #section-diagram {
      border-radius: 0.75rem;
      background: #f9fafb;
      border: 1px solid #e5e7eb;
    }
    .diagram-caption {
      font-size: 0.75rem;
      color: #6b7280;
      text-align: center;
    }
    .pill {
      display: inline-flex;
      align-items: center;
      gap: 0.25rem;
      padding: 0.15rem 0.55rem;
      border-radius: 999px;
      background: #eef2ff;
      color: #4338ca;
      font-size: 0.7rem;
      font-weight: 600;
    }

    #results {
      font-size: 0.85rem;
      white-space: pre-wrap;
      background: #0b1120;
      color: #e5e7eb;
      border-radius: 0.75rem;
      padding: 0.8rem 0.9rem;
      overflow-x: auto;
      font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
    }
    .utilization-badge {
      display: inline-flex;
      align-items: center;
      padding: 0.15rem 0.45rem;
      border-radius: 999px;
      font-size: 0.75rem;
      font-weight: 700;
      margin-left: 0.25rem;
    }
    .util-ok {
      background: rgba(34,197,94,0.14);
      color: #22c55e;
    }
    .util-high {
      background: rgba(249,115,22,0.15);
      color: #f97316;
    }
    .util-ng {
      background: rgba(239,68,68,0.15);
      color: #ef4444;
    }

    .shear-flag {
      display: inline-block;
      padding: 0.1rem 0.4rem;
      border-radius: 999px;
      font-size: 0.7rem;
      margin-left: 0.3rem;
    }
    .shear-normal {
      background: rgba(59,130,246,0.1);
      color: #60a5fa;
    }
    .shear-high {
      background: rgba(234,179,8,0.12);
      color: #eab308;
    }
    .shear-fail {
      background: rgba(239,68,68,0.12);
      color: #ef4444;
    }

    .small {
      font-size: 0.8rem;
      color: #6b7280;
    }