.masthead {
      text-decoration: none;
      color: inherit;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 24px;
    }

    .bju-mode-intro b {
      color: var(--ink-soft);
    }

    .hero-metric::after {
      content: '';
      position: absolute;
      right: -30px;
      top: -30px;
      width: 110px;
      height: 110px;
      border-radius: 50%;
      background: radial-gradient(circle, rgba(137, 108, 255, 0.25), transparent 70%);
    }

    .hero-breakdown {
      position: relative;
      font-size: 12px;
      color: var(--ink-soft);
      margin-top: 6px;
      font-family: 'Golos Text', sans-serif;
    }

    .info-tooltip {
      display: none;
      position: fixed;
      width: 190px;
      background: var(--ink);
      color: #fff;
      font-family: 'Golos Text', sans-serif;
      font-style: normal;
      font-weight: 500;
      font-size: 11px;
      line-height: 1.4;
      padding: 8px 10px;
      border-radius: 8px;
      text-align: left;
      z-index: 999;
      box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    }

    .bmi-low {
      background: #8FB7E8;
      border-radius: 6px 0 0 6px;
    }

    .grid-bmi {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      align-items: stretch;
      max-width: 920px;
      margin: 0 auto;
    }

    @media (max-width: 760px) {
      .grid-bmi {
        grid-template-columns: 1fr;
      }
    }

    .field-hint {
      font-size: 11px;
      color: var(--ink-faint);
      margin-top: -8px;
      margin-bottom: 12px;
      line-height: 1.4;
    }

    .bmi-range-box {
      margin-top: 16px;
      padding: 14px 16px;
      border-radius: 12px;
      background: rgba(255, 255, 255, 0.16);
      color: #fff;
    }

    .bmi-range-box .brb-label {
      font-size: 11px;
      text-transform: uppercase;
      letter-spacing: 0.04em;
      opacity: 0.85;
      margin-bottom: 4px;
    }

    .bmi-range-box .brb-value {
      font-family: 'Roboto', sans-serif;
      font-weight: 800;
      font-size: 19px;
    }

    .bmi-category-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      margin-top: 10px;
      padding: 8px 16px;
      border-radius: 20px;
      background: var(--violet-soft);
      color: var(--violet-deep);
      font-size: 16px;
      font-weight: 800;
    }

    .fn-label+details {
      margin-top: 8px;
    }

    details {
      border-bottom: 1px solid var(--line);
      padding: 10px 0;
    }

    details:last-child {
      border-bottom: none;
    }

    summary {
      cursor: pointer;
      font-weight: 700;
      font-size: 13.5px;
      color: var(--ink);
      list-style: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      gap: 10px;
    }

    summary::-webkit-details-marker {
      display: none;
    }

    summary::after {
      content: '+';
      color: var(--violet-deep);
      font-size: 18px;
      font-weight: 700;
      transition: transform .15s;
    }

    details[open] summary::after {
      transform: rotate(45deg);
    }

    details p {
      margin: 8px 0 0;
      font-size: 12.5px;
      color: var(--ink-soft);
      line-height: 1.6;
    }