/* Accordion panels (tools, field notes): <details class="acc">, see js/accordion.js */
.block--acc { padding-top: clamp(28px, 4vw, 56px); }
.acc { border-top: 1.5px solid var(--navy-600); scroll-margin-top: 100px; }
.acc:last-child { border-bottom: 1.5px solid var(--navy-600); }
.acc__sum { list-style: none; cursor: pointer; display: grid; grid-template-columns: 172px minmax(0, 1fr) 40px; gap: 0 24px; align-items: center; padding: 26px 0; transition: background-color .15s ease; }
.acc__sum::-webkit-details-marker { display: none; }
.acc__sum:hover { background: rgba(0, 149, 198, 0.05); }
.acc__sum:focus-visible { outline: 2px solid var(--blue-500); outline-offset: 2px; }
.acc__no { font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--blue-500); padding-left: 2px; }
.acc__txt { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.acc .acc__title { margin: 0; font-size: clamp(22px, 2.3vw, 34px); line-height: 1.15; font-weight: 400; color: var(--navy-700); letter-spacing: -0.005em; }
.acc__sub { font-size: 15px; font-weight: 300; line-height: 1.5; color: var(--ink-2); max-width: 70ch; }
.acc__icon { position: relative; width: 36px; height: 36px; border: 1px solid var(--navy-600); justify-self: end; transition: background-color .15s ease; }
.acc__icon::before, .acc__icon::after { content: ""; position: absolute; left: 50%; top: 50%; width: 14px; height: 1.5px; background: var(--navy-600); transform: translate(-50%, -50%); transition: transform .2s ease, opacity .2s ease; }
.acc__icon::after { transform: translate(-50%, -50%) rotate(90deg); }
.acc[open] > .acc__sum .acc__icon { background: var(--navy-600); }
.acc[open] > .acc__sum .acc__icon::before { background: var(--white); }
.acc[open] > .acc__sum .acc__icon::after { opacity: 0; transform: translate(-50%, -50%) rotate(0deg); }
.acc[open] > .acc__sum { border-bottom: 0.5px solid rgba(0, 69, 112, 0.4); }
.acc__body { padding: clamp(24px, 3vw, 36px) 0 clamp(36px, 4vw, 56px); }
.acc__body > .block__intro:first-child { margin-top: 0; margin-bottom: clamp(24px, 3vw, 36px); max-width: var(--measure); }
@media (prefers-reduced-motion: no-preference) {
  .acc[open] > .acc__body { animation: acc-in .25s ease-out; }
  @keyframes acc-in { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
}
@media (max-width: 900px) {
  .acc { scroll-margin-top: 16px; }
  .acc__sum { grid-template-columns: minmax(0, 1fr) 36px; gap: 8px 16px; padding: 20px 0; }
  .acc__no { grid-column: 1 / -1; }
  .acc__txt { grid-column: 1; }
  .acc__icon { grid-column: 2; grid-row: 2; width: 32px; height: 32px; }
  .acc__sub { font-size: 14px; }
}