/* AI, explained (/ai-explained and /ai-explained/<slug>). Generated pages, see tools/ai-explained. */

/* ---------- Shared: cards, tiles, chips ---------- */
.aix { background: var(--cream); color: var(--ink); }
.aix main h1, .aix main h2, .aix main h3 { max-width: none; }
.aix-wrap { width: min(100% - 2rem, max(1180px, 88vw)); margin-inline: auto; }
.aix-card { display: flex; flex-direction: column; min-width: 0; background: #fff; border: 1px solid var(--line); border-top: 5px solid var(--c, var(--blue)); border-radius: var(--radius-md); box-shadow: 0 1px 2px rgb(23 71 158 / .06); transition: box-shadow .18s cubic-bezier(.2,.7,.2,1); }
.aix-card:hover { box-shadow: 0 8px 24px rgb(23 71 158 / .12); }
.aix-tile { display: block; padding: clamp(.55rem, .3rem + .6vh, .8rem) .9rem; color: inherit; }
.aix-tile h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1rem, .7rem + .45vw, 1.35rem); line-height: 1.2; color: var(--blue); letter-spacing: 0; }
.aix-tile p { margin-top: .2rem; color: var(--muted); font-size: clamp(.8rem, .62rem + .3vw, 1.02rem); line-height: 1.35; }
.aix-tile:hover h2, .aix-tile:focus-visible h2 { text-decoration: underline; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.aix-chips { display: flex; flex-wrap: wrap; gap: .35rem; padding: 0 .9rem .7rem; }
.aix-chip { display: inline-block; font-family: var(--font-display); font-weight: 600; font-size: clamp(.72rem, .58rem + .22vw, .92rem); line-height: 1.2; padding: .25rem .7rem; border-radius: var(--radius-full); color: var(--chip-ink, var(--teal-dark)); background: var(--chip-bg, #e6f6f3); border: 1px solid var(--chip-line, #b3e5dc); }
.aix-chip:hover { border-color: currentColor; }
[data-aix="rail-gov"] { --chip-ink: #c52335; --chip-bg: #fdecee; --chip-line: #f8c2c8; }
[data-aix="rail-cost"] { --chip-ink: #5f6c00; --chip-bg: #f6f9dc; --chip-line: #e3eba0; }

/* ---------- Front page ---------- */
.aix-front { padding-block: clamp(.9rem, 2vh, 1.6rem); }
.aix-head h1 { max-width: none; font-size: clamp(1.9rem, 1.2rem + 1.6vw, 3.2rem); line-height: 1.05; text-transform: uppercase; color: var(--blue); font-weight: 800; }
.aix-sub { margin-top: .35rem; color: var(--muted); font-size: clamp(.92rem, .8rem + .3vw, 1.2rem); }
.aix-asof { display: inline-block; margin-left: .5rem; font-family: var(--font-display); font-weight: 700; font-size: .72em; letter-spacing: .14em; text-transform: uppercase; color: var(--muted); opacity: .8; }
.aix-stack { display: grid; grid-template-columns: minmax(180px, 13.5%) minmax(0, 1fr) minmax(140px, 10%); gap: .6rem; margin-top: clamp(.6rem, 1.6vh, 1.1rem); min-height: clamp(460px, calc(100svh - 290px), 1100px); }
.aix-rail .aix-tile h2 { font-size: clamp(1rem, .7rem + .35vw, 1.3rem); }
.aix-rail .aix-chips { flex-direction: column; align-items: flex-start; padding-top: .2rem; }
.aix-layers { display: grid; padding-bottom: 2px; grid-template-rows: repeat(3, minmax(min-content, 1fr)) minmax(min-content, 1.5fr) minmax(min-content, 1fr); gap: .55rem; min-height: 0; }
.aix-layer { display: grid; grid-template-columns: clamp(96px, 7.5vw, 160px) minmax(0, 1fr); gap: .6rem; min-height: 0; }
.aix-layer-label { display: flex; align-items: center; padding-left: .65rem; border-left: 4px solid var(--c); font-family: var(--font-display); font-weight: 700; font-size: clamp(.66rem, .5rem + .25vw, .9rem); letter-spacing: .14em; line-height: 1.3; text-transform: uppercase; color: var(--c); }
.aix-row { display: grid; grid-template-columns: repeat(var(--n), minmax(0, 1fr)); gap: .55rem; min-height: 0; }
.aix-row--fuel { grid-template-columns: 1fr 1.6fr; }
.aix-start { display: flex; align-items: center; gap: 1.1rem; margin-top: .6rem; padding: clamp(.55rem, .3rem + .7vh, .9rem) 1.25rem; border-radius: var(--radius-md); background: var(--blue); color: #fff; }
.aix-start .aix-pill { font-family: var(--font-display); font-weight: 800; font-size: .85rem; letter-spacing: .04em; text-transform: uppercase; background: var(--teal); border-radius: var(--radius-full); padding: .35rem .9rem; white-space: nowrap; }
.aix-start h2 { font-family: var(--font-display); font-weight: 700; font-size: clamp(1rem, .8rem + .45vw, 1.4rem); color: #fff; }
.aix-start:hover h2 { text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 820px) {
  .aix-stack { display: flex; flex-direction: column; height: auto; }
  .aix-rail { height: auto; }
  .aix-rail .aix-chips { flex-direction: row; }
  [data-aix="rail-gov"] { order: -1; }
  [data-aix="rail-cost"] { order: 1; }
  .aix-layers { display: flex; flex-direction: column; gap: .9rem; }
  .aix-layer { grid-template-columns: 1fr; gap: .4rem; }
  .aix-layer-label { padding-block: .1rem; }
  .aix-row, .aix-row--fuel { grid-template-columns: 1fr; }
  .aix-start { flex-wrap: wrap; gap: .6rem; }
}

/* ---------- Segment pages ---------- */
.aix-seg { padding-block: clamp(.9rem, 2vh, 1.6rem) clamp(2rem, 4vh, 3rem); }
.aix-seg[data-layer="rail-cost"] { --c-ink: #6b7a00; }
.aix-crumb { font-family: var(--font-display); font-weight: 600; font-size: .85rem; color: var(--muted); }
.aix-crumb a { color: var(--blue); }
.aix-seg-grid { display: grid; grid-template-columns: 170px minmax(0, 1fr) minmax(290px, 23%); gap: clamp(1.25rem, 2.2vw, 2.25rem); margin-top: .8rem; align-items: start; }
.aix-mini { display: grid; grid-template-columns: 14px 1fr 14px; gap: 5px; }
.aix-mini-layers { display: flex; flex-direction: column; gap: 5px; }
.aix-mini-layers a { font-family: var(--font-display); font-weight: 600; font-size: .74rem; padding: .45rem .6rem; border-radius: 7px; background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--c); color: var(--muted); }
.aix-mini-layers a.on { background: var(--c); border-color: var(--c); color: #fff; }
.aix-mini-rail { border-radius: 7px; background: var(--c); opacity: .3; }
.aix-mini-rail.on { opacity: 1; }
.aix-mini p { grid-column: 1 / -1; font-size: .74rem; color: var(--muted); margin-top: .2rem; }
.aix-seg-main h1 { font-size: clamp(2rem, 1.3rem + 1.8vw, 3.4rem); line-height: 1.02; text-transform: uppercase; color: var(--blue); font-weight: 800; }
.aix-one { margin: .7rem 0 .4rem; padding-left: 1rem; border-left: 5px solid var(--c); font-family: var(--font-display); font-weight: 600; font-size: clamp(1.1rem, .9rem + .55vw, 1.55rem); line-height: 1.3; color: var(--ink); }
.aix-seg-main h2, .aix-side h2 { margin: 1rem 0 .4rem; font-family: var(--font-display); font-weight: 700; font-size: .85rem; letter-spacing: .14em; text-transform: uppercase; line-height: 1.3; color: var(--c-ink, var(--c)); }
.aix-seg-main h2 .hd-dot, .aix-side h2 .hd-dot { color: inherit; }
.aix-seg-body { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: clamp(1rem, 2vw, 2rem); align-items: start; margin-top: .4rem; }
.aix-seg-text ul { padding-left: 1.15rem; }
.aix-seg-text li { font-size: clamp(.92rem, .82rem + .2vw, 1.08rem); line-height: 1.5; color: #333; margin-bottom: .25rem; }
.aix-figure { margin: 0; padding: .75rem; background: #fff; border: 1px solid var(--line); border-radius: var(--radius-md); }
.aix-diagram { display: block; width: 100%; height: auto; max-height: 420px; }
.aix-terms { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: .6rem; }
.aix-term { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--c); border-radius: var(--radius-sm); padding: .6rem .8rem; scroll-margin-top: 100px; transition: box-shadow .24s cubic-bezier(.2,.7,.2,1); }
.aix-term h3 { font-family: var(--font-display); font-weight: 700; font-size: .98rem; color: var(--blue); letter-spacing: 0; line-height: 1.25; }
.aix-term p { margin-top: .15rem; font-size: .86rem; line-height: 1.4; color: #333; }
.aix-term:target { box-shadow: 0 0 0 3px var(--c), 0 8px 24px rgb(23 71 158 / .14); }
.aix-side { display: flex; flex-direction: column; gap: .8rem; }
.aix-side .aix-card { border-top-width: 1px; padding: 1rem 1.1rem; }
.aix-side h2 { margin-top: 0; }
.aix-helps { background: var(--blue); border-color: var(--blue); color: #fff; }
.aix-helps h2 { color: var(--cyan); }
.aix-helps p { font-size: .95rem; line-height: 1.5; }
.aix-helps a { display: inline-block; margin-top: .6rem; font-weight: 700; color: #fff; text-decoration: underline; text-underline-offset: 3px; }
.aix-learn-link { display: block; padding: .6rem 0; border-top: 1px solid var(--line); }
.aix-learn-link em { display: block; font-style: normal; font-family: var(--font-display); font-weight: 700; font-size: .68rem; letter-spacing: .12em; text-transform: uppercase; color: var(--teal-dark); }
.aix-learn-link b { display: block; font-family: var(--font-display); font-weight: 600; font-size: .95rem; line-height: 1.3; color: var(--blue); }
.aix-learn-link span { display: block; font-size: .82rem; color: var(--muted); }
.aix-learn-link:hover b { text-decoration: underline; text-underline-offset: 3px; }
.aix-pager { display: grid; grid-template-columns: 1fr auto 1fr; gap: 1rem; margin-top: 1.4rem; padding-top: 1rem; border-top: 1px solid var(--line); font-family: var(--font-display); font-weight: 600; color: var(--blue); }
.aix-pager .aix-next { text-align: right; }
.aix-pager a:hover { text-decoration: underline; text-underline-offset: 3px; }

@media (max-width: 1100px) {
  .aix-seg-grid { grid-template-columns: minmax(0, 1fr) minmax(260px, 34%); }
  .aix-mini { display: none; }
}
@media (max-width: 820px) {
  .aix-seg-grid, .aix-seg-body { grid-template-columns: 1fr; }
  .aix-terms { grid-template-columns: 1fr; }
  .aix-pager { grid-template-columns: 1fr 1fr; }
  .aix-pager .aix-back { grid-column: 1 / -1; grid-row: 2; text-align: center; }
}