/* ════════════════════════════════════════════════════════════════════
   BKG MOTION — stylesheet half of the motion layer.
   Pair with motion/bkg-motion.js. Reads tokens from colors_and_type.css;
   every token has a literal fallback so this file also works standalone.
   All motion sits behind prefers-reduced-motion guards.
   ════════════════════════════════════════════════════════════════════ */

/* ─── THE LIVING MARK · <bkg-mark> ─────────────────────────────────── */
bkg-mark { display: inline-block; position: relative; overflow: hidden; flex: 0 0 auto; vertical-align: middle; }
bkg-mark img, bkg-mark video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: block; user-select: none;
}
bkg-mark video { opacity: 0; transition: opacity 560ms cubic-bezier(0.2, 0.8, 0.2, 1); }
bkg-mark.is-live video { opacity: 1; }

/* plate — the herbarium plate cropped to its sheet (default) */
bkg-mark.bkgm-plate {
  border: 1px solid var(--paper-edge, #D8CBA8);
  border-radius: var(--radius-xs, 2px);
  box-shadow: var(--shadow-page-1, 0 1px 2px rgba(42, 38, 32, 0.18));
  background: var(--paper-cream, #F2E9D2);
}
/* square — the full 1:1 frame, shown clean (no chrome) */
bkg-mark.bkgm-square { background: transparent; }
bkg-mark.bkgm-square img, bkg-mark.bkgm-square video { object-fit: contain; }
/* disk — a porthole crop for circular contexts (seals, avatars) */
bkg-mark.bkgm-disk {
  border-radius: 50%;
  border: 1px solid var(--specimen-brass-aged, #7C6235);
  box-shadow: inset 0 0 0 2px var(--specimen-brass-pale, #E2CFA6), var(--shadow-page-1, 0 1px 2px rgba(42, 38, 32, 0.18));
  background: var(--paper-cream, #F2E9D2);
}
bkg-mark.bkgm-disk img, bkg-mark.bkgm-disk video { transform: scale(1.32); transform-origin: 50% 46%; }

/* ─── SCROLL REVEALS · [data-reveal] / [data-draw] ─────────────────── */
@media (prefers-reduced-motion: no-preference) {
  [data-reveal] { opacity: 0; transform: translateY(14px); transition: opacity 640ms cubic-bezier(0.2, 0.8, 0.2, 1), transform 640ms cubic-bezier(0.2, 0.8, 0.2, 1); }
  [data-reveal].in { opacity: 1; transform: none; }
  [data-draw] path, [data-draw] circle, [data-draw] line {
    stroke-dasharray: 1; stroke-dashoffset: 1;
    transition: stroke-dashoffset 1100ms cubic-bezier(0.2, 0.8, 0.2, 1);
  }
  [data-draw].in path, [data-draw].in circle, [data-draw].in line { stroke-dashoffset: 0; }
}

/* Frozen-timeline guard — set by bkg-motion.js when the renderer can't
   tick transitions (print, DOM capture, hidden iframes): everything
   snaps to its revealed end-state. */
.bkg-static [data-reveal] { opacity: 1 !important; transform: none !important; transition: none !important; }
.bkg-static [data-draw] path, .bkg-static [data-draw] circle, .bkg-static [data-draw] line { stroke-dashoffset: 0 !important; transition: none !important; }
.bkg-static .m-rule[data-reveal]::before, .bkg-static .m-rule[data-reveal]::after { transform: scaleX(1) !important; transition: none !important; }
.bkg-static bkg-mark video { display: none; }

/* ─── BUTTONS · press-into-paper physics, ink + brass optics ───────── */
.mbtn {
  --mbtn-ink: var(--ink-graphite, #2A2620);
  --mbtn-deep: var(--specimen-teal-deep, #234C5A);
  position: relative; display: inline-flex; align-items: center; justify-content: center; gap: 9px;
  font-family: var(--font-ui, Archivo, sans-serif); font-size: 14px; font-weight: 600; letter-spacing: 0.01em; line-height: 1.1;
  padding: 12px 22px; cursor: pointer; text-decoration: none; white-space: nowrap;
  border: 1.5px solid var(--mbtn-ink); border-radius: var(--radius-xs, 2px);
  background: var(--mbtn-ink); color: var(--paper-cream, #F2E9D2);
  overflow: hidden; isolation: isolate;
  transition: background-color 180ms cubic-bezier(0.2, 0.8, 0.2, 1), border-color 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
              color 180ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 180ms cubic-bezier(0.2, 0.8, 0.2, 1),
              transform 80ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mbtn:focus-visible { outline: none; box-shadow: var(--shadow-focus, 0 0 0 3px rgba(60, 122, 138, 0.45)); }
.mbtn:hover { background: var(--mbtn-deep); border-color: var(--mbtn-deep); }
.mbtn:active { transform: translateY(1px); transition-duration: 80ms; }
.mbtn[disabled] { opacity: 0.45; pointer-events: none; }
/* brass light passes over the face on hover — lacquer, not glass */
.mbtn::before {
  content: ""; position: absolute; top: -40%; bottom: -40%; left: -38%; width: 34%;
  background: linear-gradient(100deg, transparent 0%, rgba(226, 207, 166, 0.34) 50%, transparent 100%);
  transform: skewX(-18deg) translateX(0); z-index: 1; pointer-events: none;
}
@media (prefers-reduced-motion: no-preference) {
  .mbtn:hover::before { transform: skewX(-18deg) translateX(460%); transition: transform 700ms cubic-bezier(0.2, 0.8, 0.2, 1); }
}
.mbtn > * { position: relative; z-index: 2; }
.mbtn-teal { --mbtn-ink: var(--specimen-teal, #3C7A8A); --mbtn-deep: var(--specimen-teal-deep, #234C5A); }
.mbtn-rust { --mbtn-ink: var(--specimen-rust, #A53A2D); --mbtn-deep: #7E2C22; }

/* scribe — quiet outline whose border is re-inked by a compass on hover */
.mbtn-scribe { background: transparent; color: var(--mbtn-ink); border-color: color-mix(in oklab, var(--mbtn-ink) 38%, transparent); }
.mbtn-scribe::before { display: none; }
.mbtn-scribe::after {
  content: ""; position: absolute; inset: -1.5px; border-radius: inherit; pointer-events: none;
  border: 1.5px solid var(--specimen-brass-aged, #7C6235); z-index: 1;
  clip-path: inset(0 100% 0 0); transition: clip-path 420ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mbtn-scribe:hover { background: color-mix(in oklab, var(--specimen-brass-pale, #E2CFA6) 26%, transparent); color: var(--mbtn-deep); }
.mbtn-scribe:hover::after { clip-path: inset(0 0 0 0); }

/* stamp — mono engineering chip; pressing leaves an ink ring */
.mbtn-stamp {
  font-family: var(--font-mono, "JetBrains Mono", monospace); font-size: 11px; font-weight: 700;
  letter-spacing: 0.14em; text-transform: uppercase; padding: 10px 16px;
  background: var(--specimen-brass, #B08D5C); border-color: var(--specimen-brass-aged, #7C6235);
}
.mbtn-stamp:hover { background: var(--specimen-brass-aged, #7C6235); border-color: var(--specimen-brass-aged, #7C6235); }
@media (prefers-reduced-motion: no-preference) {
  .mbtn-stamp:active::after {
    content: ""; position: absolute; inset: 0; border-radius: inherit; z-index: 1;
    animation: mbtnStamp 460ms cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  }
  @keyframes mbtnStamp {
    0% { box-shadow: inset 0 0 0 0 rgba(90, 59, 31, 0.55); }
    35% { box-shadow: inset 0 0 0 5px rgba(90, 59, 31, 0.35); }
    100% { box-shadow: inset 0 0 0 1px rgba(90, 59, 31, 0); }
  }
}

/* root — a text action whose underline grows like a taproot */
.mbtn-root {
  background: transparent; border-color: transparent; color: var(--mbtn-deep);
  padding: 8px 4px; overflow: visible;
}
.mbtn-root::before { display: none; }
.mbtn-root::after {
  content: ""; position: absolute; left: 2px; right: 2px; bottom: 2px; height: 1.5px;
  background: currentColor; transform: scaleX(0); transform-origin: 0 50%;
  transition: transform 360ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mbtn-root:hover { color: var(--specimen-rust, #A53A2D); background: transparent; border-color: transparent; }
.mbtn-root:hover::after { transform: scaleX(1); }

/* ─── VINE LINK · inline text links ────────────────────────────────── */
.mlink {
  color: var(--specimen-teal-deep, #234C5A); text-decoration: none; cursor: pointer;
  background-image: linear-gradient(currentColor, currentColor);
  background-repeat: no-repeat; background-size: 0% 1.5px; background-position: 0 96%;
  transition: background-size 360ms cubic-bezier(0.2, 0.8, 0.2, 1), color 180ms cubic-bezier(0.2, 0.8, 0.2, 1);
}
.mlink:hover { color: var(--specimen-rust, #A53A2D); background-size: 100% 1.5px; }

/* ─── BRANCH RULE · a divider that draws itself ────────────────────── */
.m-rule { display: flex; align-items: center; gap: 14px; border: 0; margin: 0; }
.m-rule::before, .m-rule::after {
  content: ""; height: 1px; flex: 1; background: var(--paper-edge, #D8CBA8);
}
.m-rule svg { flex: 0 0 auto; display: block; color: var(--specimen-brass-aged, #7C6235); }
@media (prefers-reduced-motion: no-preference) {
  .m-rule::before { transform-origin: 100% 50%; }
  .m-rule::after { transform-origin: 0 50%; }
  .m-rule[data-reveal]::before, .m-rule[data-reveal]::after { transform: scaleX(0); transition: transform 900ms cubic-bezier(0.2, 0.8, 0.2, 1) 120ms; }
  .m-rule[data-reveal].in::before, .m-rule[data-reveal].in::after { transform: scaleX(1); }
}
.m-rule[data-reveal] { opacity: 1; }

/* ─── SURVEY TICKER · slow engineering-ruler marquee ───────────────── */
.m-ticker {
  position: relative; overflow: hidden; user-select: none;
  border-top: 1px solid var(--paper-edge, #D8CBA8); border-bottom: 1px solid var(--paper-edge, #D8CBA8);
  background:
    repeating-linear-gradient(90deg, color-mix(in oklab, var(--specimen-brass-aged, #7C6235) 38%, transparent) 0 1px, transparent 1px 14px)
    0 100% / 100% 7px no-repeat,
    var(--paper-cream, #F2E9D2);
}
.m-ticker .m-ticker-track { display: flex; gap: 0; width: max-content; }
.m-ticker .m-ticker-seg {
  display: inline-flex; align-items: center; gap: 28px; padding: 13px 14px 13px 28px;
  font-family: var(--font-mono, "JetBrains Mono", monospace); font-size: 11px; font-weight: 700;
  letter-spacing: 0.22em; text-transform: uppercase; color: var(--ink-faded, #6B6052); white-space: nowrap;
}
.m-ticker .m-ticker-seg b { color: var(--specimen-rust, #A53A2D); font-weight: 700; }
.m-ticker .m-ticker-seg::after { content: "·"; color: var(--specimen-brass-aged, #7C6235); }
@media (prefers-reduced-motion: no-preference) {
  .m-ticker .m-ticker-track { animation: mTicker 36s linear infinite; }
  @keyframes mTicker { from { transform: translateX(0); } to { transform: translateX(-50%); } }
}

/* ─── COMPASS HOVER · any .m-compass child svg sweeps on hover ─────── */
@media (prefers-reduced-motion: no-preference) {
  .m-compass svg { transition: transform 700ms cubic-bezier(0.2, 0.8, 0.2, 1); }
  .m-compass:hover svg { transform: rotate(180deg); }
}

/* ─── SPECIMEN CARD LIFT · hover physics from the README, packaged ─── */
.m-lift { transition: transform 180ms cubic-bezier(0.2, 0.8, 0.2, 1), box-shadow 180ms cubic-bezier(0.2, 0.8, 0.2, 1), border-color 180ms cubic-bezier(0.2, 0.8, 0.2, 1); }
@media (prefers-reduced-motion: no-preference) {
  .m-lift:hover { transform: translateY(-2px); box-shadow: var(--shadow-page-2, 0 3px 8px rgba(42, 38, 32, 0.22)); }
}