/* Information architecture extension. Shared approved styles stay unchanged. */
.field-notes-page .fn-hero h1 { font-size: clamp(3.3rem,4.45vw,4rem); }
.field-notes-page .fn-hero-panel h2 { font-size: 2.65rem; }
.field-notes-page .fn-path a { color: var(--midnight); font-size: .8rem; font-weight: 700; text-decoration: none; }
.field-notes-page .fn-path a:hover { text-decoration: underline; text-underline-offset: 4px; }
.field-notes-page .ia-foundation, .field-notes-page .ia-questions { padding-block: 48px; scroll-margin-top: 20px; }
.field-notes-page .ia-shorthand { border-left: 3px solid var(--accent-blue); padding: 12px 20px; margin: 0 0 28px; background: #edf5f9; color: var(--accent-navy); font-size: .96rem; max-width: 950px; }
.field-notes-page .ia-principles { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 26px 24px; }
.field-notes-page .ia-principles article { border-top: 1px solid #bed2df; padding-top: 16px; }
.field-notes-page .ia-principles article > span { color: var(--accent-blue); font-size: .68rem; font-weight: 700; letter-spacing: .15em; }
.field-notes-page .ia-principles h3 { font-size: 1.65rem; line-height: 1.05; margin: 8px 0 10px; }
.field-notes-page .ia-principles p { font-size: .81rem; line-height: 1.6; margin: 0; color: #435c6b; }
.field-notes-page .ia-source { font-size: .71rem; color: #526674; margin: 26px 0 0; max-width: 1030px; }
.field-notes-page .ia-source a { color: #285e80; text-underline-offset: 3px; }
.field-notes-page .ia-model-wrap { background: #e8f1f7; border-block: 1px solid #c6d9e6; padding-block: 46px 32px; scroll-margin-top: 20px; }
.field-notes-page .ia-model { display: grid; grid-template-columns: minmax(260px,.75fr) minmax(0,1.7fr); border: 1px solid #b9cedd; background: #f8fbfd; }
.field-notes-page .ia-tabs { background: #edf4f9; border-right: 1px solid #c3d6e3; }
.field-notes-page .ia-tabs button { display: grid; grid-template-columns: 24px 1fr 12px; gap: 13px; align-items: center; width: 100%; text-align: left; padding: 20px 24px; min-height: 66px; border: 0; border-bottom: 1px solid #c3d6e3; background: transparent; color: #324e63; font-size: .82rem; font-weight: 600; }
.field-notes-page .ia-tabs button:last-child { border-bottom: 0; }
.field-notes-page .ia-tabs button span { color: #497695; font-size: .68rem; }
.field-notes-page .ia-tabs button i { font-size: .65rem; }
.field-notes-page .ia-tabs button[aria-selected=true] { background: var(--midnight); color: white; }
.field-notes-page .ia-tabs button[aria-selected=true] span { color: var(--accent-blue-light); }
.field-notes-page .ia-panels { padding: 32px 38px; }
.field-notes-page .ia-panels h3 { font-size: 2.55rem; line-height: 1; margin: 0 0 25px; }
.field-notes-page .ia-panels .section-label { font-size: .64rem; color: #356584; margin-bottom: 10px; }
.field-notes-page .ia-panels dl { margin: 0; }
.field-notes-page .ia-panels dt { font-size: .72rem; font-weight: 700; color: var(--midnight); margin-bottom: 5px; }
.field-notes-page .ia-panels dd { margin: 0 0 19px; color: #40535f; font-size: .88rem; }
.field-notes-page .ia-model-example { border-left: 3px solid #86b2cb; padding: 13px 18px; background: #edf5f9; margin: 0 0 22px; }
.field-notes-page .ia-model-example p:not(.section-label) { font-size: .83rem; color: #40535f; margin: 0; }
.field-notes-page .ia-example { display: grid; grid-template-columns: .9fr 1.1fr; gap: 64px; align-items: center; padding-block: 48px; border-bottom: 1px solid #c6d9e6; }
.field-notes-page .ia-example h2 { font-size: 3rem; line-height: 1; margin: 0 0 24px; }
.field-notes-page .ia-example-copy > p:not(.section-label) { color: #40535f; font-size: .9rem; margin: 0 0 18px; }
.field-notes-page .ia-object { padding: 25px 28px; background: var(--midnight); color: #e2edf4; }
.field-notes-page .ia-example-switch { display: flex; gap: 8px; border-bottom: 1px solid #394b60; padding-bottom: 22px; margin-bottom: 23px; }
.field-notes-page .ia-example-switch button { border: 1px solid #526a82; border-radius: 24px; padding: 10px 15px; min-height: 44px; background: transparent; color: #d6e6f1; font-size: .75rem; font-weight: 600; }
.field-notes-page .ia-example-switch button[aria-pressed=true] { background: #d3e8f5; border-color: #d3e8f5; color: var(--midnight); }
.field-notes-page .ia-object .section-label { color: var(--accent-blue-light); font-size: .6rem; margin-bottom: 8px; }
.field-notes-page .ia-object h3 { font-size: 2.25rem; line-height: 1.05; color: white; margin: 0 0 20px; }
.field-notes-page .ia-object dl { display: grid; grid-template-columns: .8fr 1.2fr; column-gap: 20px; margin: 0; }
.field-notes-page .ia-object dt, .field-notes-page .ia-object dd { font-size: .77rem; padding-block: 11px; border-top: 1px solid #2c3c51; margin: 0; }
.field-notes-page .ia-object dt { color: #a9cfe7; font-weight: 600; }
.field-notes-page .ia-context-note { color: #b7cbda; font-size: .68rem; margin: 20px 0 0; }
.field-notes-page .fn-note > .fn-ia-lens { border-left: 2px solid #91b5cc; padding-left: 10px; font-size: .73rem !important; color: #36576d !important; margin-bottom: 17px !important; }
.field-notes-page .ia-faq { border-top: 1px solid #b9cedd; }
.field-notes-page .ia-faq:last-child { border-bottom: 1px solid #b9cedd; }
.field-notes-page .ia-faq summary { display: flex; justify-content: space-between; align-items: center; gap: 25px; list-style: none; cursor: pointer; padding: 23px 0; color: var(--midnight); font-family: var(--serif); font-weight: 600; font-size: 1.65rem; line-height: 1.1; }
.field-notes-page .ia-faq summary::-webkit-details-marker { display: none; }
.field-notes-page .ia-faq summary i { color: var(--accent-blue); font-size: .85rem; }
.field-notes-page .ia-faq[open] summary i { transform: rotate(45deg); }
.field-notes-page .ia-faq > div { padding: 0 45px 24px 0; max-width: 950px; }
.field-notes-page .ia-faq p { font-size: .9rem; color: #40535f; margin: 0 0 16px; }
.field-notes-page .ia-faq .ia-try { border-left: 3px solid var(--accent-blue); background: #edf5f9; padding: 14px 18px; margin-bottom: 0; }
@media (max-width:1050px) {
  .field-notes-page .ia-principles { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .field-notes-page .ia-example { gap: 30px; }
  .field-notes-page .ia-model { grid-template-columns: 260px minmax(0,1fr); }
  .field-notes-page .ia-panels { padding: 28px; }
  .field-notes-page .fn-hero h1 { font-size: 3.25rem; }
  .field-notes-page .fn-hero-panel h2 { font-size: 2.3rem; }
}
@media (max-width:760px) {
  .field-notes-page .fn-hero h1 { font-size: clamp(2.65rem,8vw,3.6rem); }
  .field-notes-page .fn-path a { font-size: .85rem; }
  .field-notes-page .ia-principles { gap: 20px 18px; }
  .field-notes-page .ia-principles h3 { font-size: 1.5rem; }
  .field-notes-page .ia-principles p { font-size: .79rem; }
  .field-notes-page .ia-model, .field-notes-page .ia-example { grid-template-columns: minmax(0,1fr); }
  .field-notes-page .ia-tabs { border-right: 0; border-bottom: 1px solid #c3d6e3; }
  .field-notes-page .ia-tabs button { min-height: 50px; padding: 15px 20px; }
  .field-notes-page .ia-panels { padding: 27px 22px; }
  .field-notes-page .ia-panels h3 { font-size: 2.25rem; }
  .field-notes-page .ia-object { padding: 24px 20px; }
  .field-notes-page .ia-object dl { column-gap: 14px; }
  .field-notes-page .ia-example h2 { font-size: 2.7rem; }
  .field-notes-page .ia-example-switch button { font-size: .72rem; padding-inline: 12px; }
  .field-notes-page .ia-faq summary { font-size: 1.5rem; }
  .field-notes-page .ia-faq > div { padding-right: 0; }
}