/* ascent-map.css — prefix .am-  (PHASE2-CONTRACT.md §1).
   Does NOT define .is-lit / .is-dim (lenses.css owns those shared state classes;
   this file may rely on them existing). Inherits the site tokens from styles.css. */

:root {
  --am-spine-base: var(--accent, #c2693b);
  --am-spine-top: #6b4a8a;
}

/* ---- stage + svg ----
   Full-bleed: break out of the .territory 840px reading column and own the viewport
   width + (most of) its height, so the map isn't a thin centred strip with dead paper.
   The camera (ascent-map.js) keeps the SVG viewBox == this box's pixel rect. */
.am-stage {
  position: relative;
  width: 100vw;
  margin-left: calc(50% - 50vw);
  margin-right: calc(50% - 50vw);
  height: clamp(560px, 90vh, 1600px);
  background:
    radial-gradient(120% 80% at 50% 102%, color-mix(in srgb, var(--accent) 9%, transparent), transparent 60%),
    var(--paper);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  touch-action: none;           /* pointer gestures own the surface */
  user-select: none;
}
.am-stage[hidden] { display: none; }

.am-svg {
  display: block;
  width: 100%;
  height: 100%;
  cursor: grab;
}
.am-svg:active { cursor: grabbing; }

/* ---- bands (fuller-width backing strata) ---- */
.am-band {
  fill: color-mix(in srgb, var(--accent) 7%, var(--paper));
  stroke: var(--line);
  stroke-width: 1.5;
}
.am-band:nth-of-type(even) { fill: color-mix(in srgb, #6b4a8a 7%, var(--paper)); }

/* Band titles live in a counter-scaled foreignObject (font-size ÷ k) so they hold a
   constant ~21px on screen at every altitude — legible in the overview, never vanishing —
   AND wrap to the label box width so the longest title sits inside its band instead of
   overflowing into the right margin. --am-k is written by the pan/zoom controller on every
   transform; the fallback 0.2 is a sane overview scale before the first commit. */
.am-band-label { overflow: visible; pointer-events: none; }
.am-band-label-inner {
  font-family: var(--serif);
  font-size: calc(21px / var(--am-k, 0.2));
  line-height: 1.16;
  text-wrap: balance;
}
.am-band-id {
  display: inline-block;
  color: var(--accent);
  font-family: var(--sans);
  font-weight: 700;
  font-size: 0.6em;             /* relative to the counter-scaled parent → also scales */
  letter-spacing: 0.04em;
  margin-right: 0.5em;
  vertical-align: 0.08em;
}
.am-band-title {
  color: var(--ink);
  font-weight: 600;
}

/* ---- spine + bookends ---- */
.am-spine { stroke-width: 4; stroke-linecap: round; }
.am-cap { stroke: var(--paper); stroke-width: 3; }
.am-cap-base { fill: var(--am-spine-base); }
.am-cap-summit { fill: var(--am-spine-top); }
/* Bookend phrases: counter-scaled <text>, constant ~16px on screen, never clipped. */
.am-cap-text {
  font-family: var(--serif);
  font-style: italic;
  font-size: calc(16px / var(--am-k, 0.2));
  fill: var(--ink-faint);
  pointer-events: none;
}

/* ---- arc nodes ---- */
.am-arc-node { cursor: pointer; }
.am-arc-dot {
  fill: var(--card);
  stroke: var(--accent);
  stroke-width: 2.5;
  transition: r 0.15s ease, fill 0.15s ease;
}
.am-arc-node:hover .am-arc-dot,
.am-arc-node:focus-visible .am-arc-dot { fill: var(--accent); r: 9; }
.am-arc-node:focus-visible { outline: none; }
.am-arc-node:focus-visible .am-arc-card {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.am-arc-card {
  font-family: var(--sans);
  display: flex;
  align-items: flex-start;
  gap: 0.55rem;
  padding: 0.15rem 0;
}
.am-arc-rank {
  font-size: 13px;
  font-weight: 700;
  color: var(--ink-faint);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}
.am-arc-main { display: flex; flex-direction: column; min-width: 0; }
.am-arc-title-row { display: flex; align-items: baseline; gap: 0.4rem; flex-wrap: wrap; }
.am-arc-title {
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.2;
}
.am-arc-marker {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 999px;
  padding: 0 0.4em;
}
.am-arc-door {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.35;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.am-arc-badge {
  align-self: flex-start;
  font-size: 10px;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  white-space: nowrap;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.05em 0.55em;
  background: var(--card);
}
.am-arc-badge.am-st-published { color: #2e7d52; border-color: color-mix(in srgb, #2e7d52 40%, transparent); }
.am-arc-badge.am-st-in-production { color: #b06a16; border-color: color-mix(in srgb, #b06a16 40%, transparent); }
/* designed = "the trail ahead": honest, never greyed away (kept full strength) */

/* ---- semantic-zoom LOD (data-lod on <svg>) ---- */
.am-svg[data-lod="bands"] .am-arc-label { display: none; }
.am-svg[data-lod="bands"] .am-arc-dot { r: 5; }
.am-svg[data-lod="bands"] #band-labels { opacity: 1; }
.am-svg[data-lod="bands"] #station-ridge { opacity: 0; pointer-events: none; }

.am-svg[data-lod="arcs"] #band-labels { opacity: 1; }
.am-svg[data-lod="arcs"] #station-ridge { opacity: 0; pointer-events: none; }

.am-svg[data-lod="stations"] #band-labels { opacity: 0.35; }
.am-svg[data-lod="stations"] .am-arc-label { opacity: 0.55; }

/* ---- station ridge (L2) ---- */
.am-ridge-path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
  stroke-dasharray: 2 6;
  stroke-linecap: round;
  opacity: 0.5;
}
.am-station-dot { fill: var(--card); stroke: var(--accent); stroke-width: 2; }
.am-finale-ring { fill: none; stroke: var(--am-spine-top); stroke-width: 2.5; stroke-dasharray: 3 4; }

.am-station-card {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  font-family: var(--sans);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.45rem 0.6rem;
  text-decoration: none;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--ink) 8%, transparent);
}
.am-station-card:hover { border-color: var(--accent); text-decoration: none; }
/* readable station (transcript exists): subtle accent inset bar + a "read" cue. */
.am-station-read {
  border-color: color-mix(in srgb, var(--accent) 45%, var(--line));
  box-shadow: 0 2px 8px color-mix(in srgb, var(--ink) 8%, transparent),
              inset 3px 0 0 var(--accent);
}
.am-station-read .am-station-ep::after { content: " · read"; color: var(--accent); }
.am-station-head { display: flex; align-items: baseline; gap: 0.4rem; }
.am-station-ep {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 700;
  color: var(--accent);
}
.am-station-title { font-family: var(--serif); font-size: 16px; font-weight: 600; color: var(--ink); }
.am-station-blurb {
  font-size: 13px; line-height: 1.35; color: var(--ink-soft);
  overflow: hidden; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical;
}
.am-finale-line { font-style: italic; color: var(--am-spine-top); -webkit-line-clamp: 2; }

.am-ridge-fallback {
  font-family: var(--sans); font-size: 13px; font-weight: 600;
  color: var(--accent); background: var(--card);
  border: 1px solid var(--line); border-radius: 8px; padding: 0.3rem 0.6rem;
}

/* ---- fixed chrome (breadcrumb + zoom-out) ---- */
.am-chrome {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.7rem clamp(1rem, 4vw, 2rem);
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 90%, white);
  position: sticky;
  top: 0;
  z-index: 10;
}
.am-chrome[hidden] { display: none; }
.am-breadcrumb { display: flex; align-items: center; gap: 0.35rem; flex-wrap: wrap; font-family: var(--sans); }
.am-crumb {
  font: inherit; font-size: 13px;
  background: none; border: none; cursor: pointer;
  color: var(--ink-soft); padding: 0.1rem 0.25rem; border-radius: 6px;
}
.am-crumb:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, transparent); }
.am-crumb[aria-current="true"] { color: var(--ink); font-weight: 600; }
.am-crumb-sep { color: var(--ink-faint); font-size: 13px; }
.am-zoomout {
  font: inherit; font-size: 12px; cursor: pointer;
  color: var(--ink-soft); background: var(--card);
  border: 1px solid var(--line-strong); border-radius: 999px;
  padding: 0.25rem 0.8rem; white-space: nowrap;
}
.am-zoomout:hover { color: var(--accent); border-color: var(--accent); }

/* ---- lens dimming (state classes owned by lenses.css; we only adjust opacity feel) ---- */
.am-arc-node.is-dim { opacity: 0.35; }
.am-arc-node.is-lit .am-arc-dot { fill: var(--accent); }

/* ---- ridge-focus: when an arc is open, de-emphasise the spine so the station ridge
   reads cleanly on top (set by ascent-map.js as .am-ridge-open + .am-arc-focused). The
   ridge group itself is NOT dimmed; restored to full strength on close. ---- */
.am-svg.am-ridge-open #arcs .am-arc-node {
  opacity: 0.16;
  transition: opacity 200ms ease;
}
.am-svg.am-ridge-open #arcs .am-arc-node.am-arc-focused { opacity: 1; }
.am-svg.am-ridge-open #threads { opacity: 0.32; transition: opacity 200ms ease; }
.am-svg.am-ridge-open #bands { opacity: 0.5; transition: opacity 200ms ease; }
#arcs .am-arc-node { transition: opacity 200ms ease; }

/* ---- reduced motion: kill all camera/scale transitions for determinism ---- */
@media (prefers-reduced-motion: reduce) {
  .am-arc-dot,
  .am-station-card,
  #viewport,
  #arcs .am-arc-node,
  .am-svg.am-ridge-open #arcs .am-arc-node,
  .am-svg.am-ridge-open #threads,
  .am-svg.am-ridge-open #bands { transition: none !important; }
}