/* MBSE Shepherd
   Layout: a flight strip. Sticky route header, one scene per screen, thumb dock at the bottom.
   Palette borrowed from aeronautical charts: pasture tint for the ground, magenta for the
   route (things you do), chart blue for what you read. */

:root {
  --bg: #e8eee1;
  --bg-line: #d2dcc8;
  --surface: #fbfdf8;
  --surface-2: #eff4e9;
  --line: #c4cfbc;
  --ink: #15221a;
  --ink-2: #41524a;
  --ink-3: #647367;
  --route: #ad1167;
  --route-soft: #f6dbe9;
  --on-route: #ffffff;
  --sky: #1a4c99;
  --sky-soft: #dbe6f8;
  --amber: #875000;
  --amber-soft: #f8e7c3;
  --grass: #236b3a;
  --grass-soft: #d4ebd1;
  --danger: #b3261e;
  --danger-soft: #f9dfdc;
  --pasture: #a6de90;
  --pasture-edge: #2c5a33;
  --wool: #34343a;
  --paper: #ffffff;
  --paper-ink: #1c1c1c;
  --shadow: 0 1px 0 rgba(21, 34, 26, 0.05), 0 18px 40px -24px rgba(21, 34, 26, 0.45);
  --scrim: rgba(15, 25, 20, 0.55);

  --font-display: "Bricolage Grotesque", "Atkinson Hyperlegible Next", "Segoe UI", system-ui, sans-serif;
  --font-body: "Atkinson Hyperlegible Next", "Atkinson Hyperlegible", "Segoe UI", system-ui, -apple-system, Roboto, sans-serif;
  --font-mono: "Atkinson Hyperlegible Mono", ui-monospace, "Cascadia Code", Consolas, "Liberation Mono", monospace;

  --r: 14px;
  --r-sm: 8px;
  --gutter: clamp(16px, 4vw, 40px);
  --top-h: 4.4rem;
  --dock-h: 4.5rem;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0e1814;
    --bg-line: #19281f;
    --surface: #16241d;
    --surface-2: #1d2f26;
    --line: #2f4439;
    --ink: #e8f0e4;
    --ink-2: #b9c7b9;
    --ink-3: #8c9c8f;
    --route: #ff8fcb;
    --route-soft: #452038;
    --on-route: #2a0b1c;
    --sky: #93bbff;
    --sky-soft: #1c2f4f;
    --amber: #f3c468;
    --amber-soft: #43330f;
    --grass: #8ad48f;
    --grass-soft: #1c3a25;
    --danger: #ff8f85;
    --danger-soft: #4a1f1c;
    --pasture: #3f7a45;
    --pasture-edge: #a6de90;
    --wool: #e8e6df;
    --paper: #f4f4f1;
    --paper-ink: #1c1c1c;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 18px 40px -24px rgba(0, 0, 0, 0.9);
    --scrim: rgba(0, 0, 0, 0.66);
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0e1814;
  --bg-line: #19281f;
  --surface: #16241d;
  --surface-2: #1d2f26;
  --line: #2f4439;
  --ink: #e8f0e4;
  --ink-2: #b9c7b9;
  --ink-3: #8c9c8f;
  --route: #ff8fcb;
  --route-soft: #452038;
  --on-route: #2a0b1c;
  --sky: #93bbff;
  --sky-soft: #1c2f4f;
  --amber: #f3c468;
  --amber-soft: #43330f;
  --grass: #8ad48f;
  --grass-soft: #1c3a25;
  --danger: #ff8f85;
  --danger-soft: #4a1f1c;
  --pasture: #3f7a45;
  --pasture-edge: #a6de90;
  --wool: #e8e6df;
  --paper: #f4f4f1;
  --paper-ink: #1c1c1c;
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 18px 40px -24px rgba(0, 0, 0, 0.9);
  --scrim: rgba(0, 0, 0, 0.66);
  color-scheme: dark;
}

/* ───────── base ───────── */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
/* No sideways panning on phones: Chrome Android ignores overflow-x on body alone, so it is set on both. */
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--top-h) + 1rem); overflow-x: hidden; overflow-x: clip; max-width: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: clamp(1.0625rem, 1rem + 0.3vw, 1.1875rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-x: clip;
  max-width: 100%;
}
img, svg { max-width: 100%; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
a { color: var(--sky); }
:focus-visible { outline: 3px solid var(--sky); outline-offset: 2px; border-radius: 4px; }
::selection { background: var(--route-soft); color: var(--ink); }

.skip {
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--bg); padding: 0.5rem 0.9rem; border-radius: var(--r-sm);
}
.skip:focus { top: 12px; }

.chart-bg {
  position: fixed; inset: 0; width: 100%; height: 100%; z-index: -1; pointer-events: none;
  max-width: none;
}
.chart-bg .contour { fill: none; stroke: var(--bg-line); stroke-width: 1.5; }
.chart-bg .patrol { fill: none; stroke: var(--route); stroke-opacity: 0.16; stroke-width: 2; stroke-dasharray: 10 9; }

.mono-label {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.09em; text-transform: uppercase;
  color: var(--ink-3);
}

/* ───────── top bar and route ───────── */
.top {
  position: sticky; top: 0; z-index: 30;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
  padding: env(safe-area-inset-top, 0px) var(--gutter) 0;
}
.top-row { display: flex; align-items: center; gap: 0.6rem; height: 2.9rem; }
.brand {
  display: grid; place-items: center; width: 2.25rem; height: 2.25rem; flex: none;
  border: 0; border-radius: 10px; background: var(--ink); color: var(--surface); padding: 0;
}
.brand svg { width: 1.45rem; height: 1.45rem; }
.crumb { min-width: 0; flex: 1; display: flex; align-items: baseline; gap: 0.55rem; }
.crumb-code {
  flex: none; font-family: var(--font-mono); font-weight: 700; font-size: 0.8rem;
  padding: 0.1rem 0.45rem; border: 1.5px solid var(--ink); border-radius: 5px; line-height: 1.3;
}
.crumb-title {
  min-width: 0; font-family: var(--font-display); font-weight: 700; font-size: 1rem;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.crumb-count { flex: none; font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-3); }
.top-actions { display: flex; gap: 0.25rem; flex: none; }
.icon-btn {
  display: inline-flex; align-items: center; gap: 0.4rem; height: 2.25rem; min-width: 2.25rem;
  padding: 0 0.55rem; border: 1.5px solid transparent; border-radius: 10px; background: transparent;
  font-size: 0.85rem; font-weight: 600;
}
.icon-btn svg { width: 1.25rem; height: 1.25rem; flex: none; }
.icon-btn:hover { background: var(--surface-2); border-color: var(--line); }
.icon-btn .txt { display: none; }
@media (min-width: 720px) { .icon-btn .txt { display: inline; } }

.route {
  position: relative; display: flex; gap: 5px; width: 100%; height: 1.5rem; align-items: center;
  padding: 0; margin: 0; border: 0; background: transparent;
}
.leg {
  position: relative; flex: var(--n) 1 0; height: 6px; border-radius: 3px; min-width: 6px;
  background: var(--line); overflow: visible;
}
.leg i {
  position: absolute; inset: 0 auto 0 0; width: 0; border-radius: 3px; background: var(--route);
  transition: width 0.5s var(--ease);
}
.leg.now { background: color-mix(in srgb, var(--route) 28%, var(--line)); }
.leg b {
  display: none; position: absolute; left: 0; top: -0.95rem;
  font-family: var(--font-mono); font-size: 0.62rem; font-weight: 700; color: var(--ink-3);
}
.leg.now b { color: var(--route); }
.route-drone {
  position: absolute; top: 50%; left: 0; width: 22px; height: 22px; margin: -11px 0 0 -11px;
  transition: left 0.7s var(--ease); pointer-events: none; color: var(--ink);
  filter: drop-shadow(0 1px 0 var(--surface)) drop-shadow(0 0 3px var(--surface));
}
.route-drone svg { display: block; width: 100%; height: 100%; }
.route-drone.flying .rotor { animation: rotor 0.25s linear 3; transform-box: fill-box; transform-origin: center; }
@keyframes rotor { 50% { transform: scale(0.55); } }

/* ───────── stage and scene ───────── */
#stage {
  display: block; outline: none;
  padding: 1.4rem var(--gutter) calc(var(--dock-h) + 2.5rem + env(safe-area-inset-bottom, 0px));
  min-height: calc(100vh - var(--top-h));
  min-height: calc(100dvh - var(--top-h));
}
.scene { max-width: 52rem; margin: 0 auto; }
.scene-head { display: grid; gap: 0.7rem; margin-bottom: 1.5rem; }
.stamp-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.5rem 0.6rem; }
.kind {
  display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.22rem 0.6rem 0.22rem 0.45rem;
  border-radius: 999px; font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700;
  letter-spacing: 0.07em; text-transform: uppercase; line-height: 1.3;
}
.kind svg { width: 1rem; height: 1rem; }
.kind-read { background: var(--sky-soft); color: var(--sky); }
.kind-do { background: var(--route-soft); color: var(--route); }
.kind-answer { background: var(--amber-soft); color: var(--amber); }
.kind-try { background: var(--grass-soft); color: var(--grass); }
.ref { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-3); }
/* points of a marked question */
.pts {
  font-family: var(--font-mono); font-size: 0.72rem; font-weight: 700; letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--amber); border: 1.5px solid var(--amber); border-radius: 999px; padding: 0.12rem 0.55rem; line-height: 1.3;
}
.pts.bonus { color: var(--grass); border-color: var(--grass); }
.done-stamp {
  margin-left: auto; font-family: var(--font-mono); font-weight: 700; font-size: 0.75rem;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--grass);
  border: 2px solid var(--grass); border-radius: 4px; padding: 0.1rem 0.5rem; transform: rotate(-4deg);
}
.done-stamp.slap { animation: slap 0.5s var(--ease); }
@keyframes slap {
  0% { transform: rotate(-14deg) scale(2.2); opacity: 0; }
  60% { transform: rotate(-2deg) scale(0.94); opacity: 1; }
  100% { transform: rotate(-4deg) scale(1); }
}
.scene h1 {
  margin: 0; font-family: var(--font-display); font-weight: 800; letter-spacing: -0.02em;
  font-size: clamp(1.7rem, 1.2rem + 2.6vw, 2.75rem); line-height: 1.08; text-wrap: balance;
  max-width: 22ch;
}
.lead { margin: 0; font-size: 1.12em; line-height: 1.5; color: var(--ink-2); max-width: 36rem; text-wrap: pretty; }
.waypoint-rule { display: flex; align-items: center; gap: 0.5rem; color: var(--route); margin-top: 0.3rem; }
.waypoint-rule::after {
  content: ""; flex: 1; height: 0; border-top: 2px dashed currentColor; opacity: 0.45;
}
.waypoint-rule svg { width: 0.9rem; height: 0.9rem; flex: none; }

.blocks { display: grid; gap: 1.25rem; }
.blocks > * { min-width: 0; }
.b-p, .b-list { margin: 0; max-width: 38rem; }
.b-h {
  margin: 0.6rem 0 -0.4rem; font-family: var(--font-display); font-weight: 700; font-size: 1.15rem;
  line-height: 1.25; text-wrap: balance;
}
.b-list { padding: 0; list-style: none; display: grid; gap: 0.55rem; }
.b-list li { position: relative; padding-left: 1.5rem; }
.b-list li::before {
  content: ""; position: absolute; left: 0.2rem; top: 0.6em; width: 0.5rem; height: 0.5rem;
  transform: rotate(45deg); border: 2px solid var(--sky);
}
strong { font-weight: 700; }

/* scene entrance */
.scene.enter .scene-head, .scene.enter .blocks > * {
  animation: rise 0.42s var(--ease) both; animation-delay: calc(var(--i, 0) * 45ms);
}
.scene.enter[data-dir="back"] .scene-head, .scene.enter[data-dir="back"] .blocks > * { animation-name: rise-back; }
@keyframes rise { from { opacity: 0; transform: translate3d(26px, 0, 0); } to { opacity: 1; transform: none; } }
@keyframes rise-back { from { opacity: 0; transform: translate3d(-26px, 0, 0); } to { opacity: 1; transform: none; } }

/* ───────── inline pieces ───────── */
.ui {
  font-family: var(--font-mono); font-size: 0.88em; font-weight: 700; white-space: nowrap;
  padding: 0.08em 0.4em; border-radius: 5px; background: var(--surface-2);
  border: 1px solid var(--line); border-bottom-width: 2px;
}
.ui i { font-style: normal; color: var(--ink-3); padding: 0 0.1em; }
.ico {
  display: inline-block; height: 1.5em; width: auto; vertical-align: -0.4em;
  border-radius: 4px; background: var(--paper); border: 1px solid var(--line); padding: 1px;
}
.ico-svg {
  width: 1.5em; height: 1.5em; background: none; border: 0; padding: 0; border-radius: 0;
  color: inherit;
}
.ico-svg svg { display: block; width: 100%; height: 100%; }
.nb { white-space: nowrap; }
.nb > * { white-space: normal; }
.mlink, .cchip {
  display: inline-flex; align-items: center; gap: 0.35em; max-width: 100%;
  padding: 0.05em 0.5em 0.05em 0.35em; margin: 0 0.05em; vertical-align: baseline;
  border-radius: 7px; font-weight: 700; font-size: 0.94em; line-height: 1.45; text-align: left;
}
.mlink {
  border: 1.5px solid var(--route); background: var(--route-soft); color: var(--route);
  transition: transform 0.15s var(--ease), box-shadow 0.15s var(--ease);
}
.mlink:hover { transform: translateY(-1px); box-shadow: 0 3px 0 -1px var(--route); }
.mlink:active { transform: translateY(0); box-shadow: none; }
.mlink svg { width: 1.05em; height: 1.05em; flex: none; }
.mlink .unset {
  font-family: var(--font-mono); font-size: 0.68em; font-weight: 700; letter-spacing: 0.04em;
  padding: 0 0.35em; border-radius: 4px; background: var(--amber-soft); color: var(--amber);
}
.cchip {
  border: 1.5px dashed var(--ink-3); background: var(--surface); color: var(--ink);
  font-family: var(--font-mono); font-size: 0.86em;
}
.cchip svg { width: 0.95em; height: 0.95em; flex: none; color: var(--ink-3); }
.cchip:hover { border-style: solid; border-color: var(--ink); }
.cchip.copied { border-style: solid; border-color: var(--grass); background: var(--grass-soft); }

/* ───────── buttons ───────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  min-height: 2.75rem; padding: 0.5rem 1.1rem; border-radius: 10px; border: 2px solid var(--route);
  background: var(--route); color: var(--on-route); font-weight: 700; text-decoration: none;
  transition: transform 0.15s var(--ease), box-shadow 0.15s var(--ease), background 0.15s;
}
.btn:hover { transform: translateY(-1px); box-shadow: 0 4px 0 -1px color-mix(in srgb, var(--route) 55%, var(--ink)); }
.btn:active { transform: translateY(1px); box-shadow: none; }
.btn svg { width: 1.15rem; height: 1.15rem; flex: none; }
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn.ghost:hover { border-color: var(--ink); box-shadow: none; }
.btn.small { min-height: 2.25rem; padding: 0.25rem 0.8rem; font-size: 0.9rem; }
.btn[disabled] { opacity: 0.45; cursor: default; transform: none; box-shadow: none; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.6rem; }

/* ───────── steps ───────── */
.steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.5rem; max-width: 44rem; }
.step {
  position: relative; display: grid; grid-template-columns: 2.5rem minmax(0, 1fr); gap: 0.85rem;
  padding: 0.8rem 0.9rem 0.8rem 0.7rem; background: var(--surface); border: 1.5px solid var(--line);
  border-radius: 10px; cursor: pointer; transition: border-color 0.2s, background 0.3s;
  -webkit-tap-highlight-color: transparent;
}
.step:hover { border-color: var(--ink-3); }
.step-n {
  position: relative; display: grid; place-items: center; width: 2.5rem; height: 2.5rem;
  border: 2px solid var(--ink); border-radius: 8px; font-family: var(--font-mono); font-weight: 700;
  background: var(--surface); transition: background 0.25s, border-color 0.25s, transform 0.25s var(--ease);
}
.step-n svg { position: absolute; width: 1.5rem; height: 1.5rem; color: var(--on-route); opacity: 0; }
.step-n svg path { stroke-dasharray: 24; stroke-dashoffset: 24; }
.step-body { min-width: 0; align-self: center; }
.step-note { margin-top: 0.45rem; font-size: 0.92em; color: var(--ink-2); padding: 0.5rem 0.7rem; background: var(--surface-2); border-radius: 8px; }
.step-fig { margin-top: 0.6rem; }
.step-split { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.9rem; align-items: center; }
.step-split .step-fig { margin-top: 0; }
.step[aria-checked="true"] { background: var(--grass-soft); border-color: color-mix(in srgb, var(--grass) 50%, var(--line)); }
.step[aria-checked="true"] .step-n { background: var(--grass); border-color: var(--grass); }
.step[aria-checked="true"] .step-n b { opacity: 0; }
.step[aria-checked="true"] .step-n svg { opacity: 1; }
.step[aria-checked="true"] .step-n svg path { stroke-dashoffset: 0; }
.step.just .step-n { animation: pop 0.45s var(--ease); }
.step.just .step-n svg path { transition: stroke-dashoffset 0.35s 0.08s ease-out; }
.step.just::after {
  content: ""; position: absolute; inset: -1.5px; border-radius: 10px; border: 2px solid var(--grass);
  animation: ring 0.6s ease-out forwards; pointer-events: none;
}
@keyframes pop { 0% { transform: scale(1); } 40% { transform: scale(1.22) rotate(-6deg); } 100% { transform: scale(1); } }
@keyframes ring { from { opacity: 0.9; transform: scale(1); } to { opacity: 0; transform: scale(1.04, 1.25); } }
.steps-foot { display: flex; align-items: center; gap: 0.6rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); }
.meter { flex: 1; max-width: 12rem; height: 6px; border-radius: 3px; background: var(--line); overflow: hidden; }
.meter i { display: block; height: 100%; width: 0; background: var(--grass); transition: width 0.4s var(--ease); }

/* ───────── figures ───────── */
.fig { margin: 0; display: grid; gap: 0.5rem; justify-items: start; }
.fig-frame {
  position: relative; display: block; padding: 6px; border: 1.5px solid var(--line); border-radius: 10px;
  background: var(--paper); cursor: zoom-in; max-width: 100%; line-height: 0;
  transition: border-color 0.2s, transform 0.2s var(--ease);
}
.fig-frame:hover { border-color: var(--ink-3); transform: translateY(-1px); }
.fig-frame img { display: block; height: auto; border-radius: 5px; }
.fig-zoom {
  position: absolute; right: 10px; bottom: 10px; display: grid; place-items: center; width: 2rem; height: 2rem;
  border-radius: 8px; background: rgba(21, 34, 26, 0.82); color: #fff;
}
.fig-zoom svg { width: 1.1rem; height: 1.1rem; }
.fig.xs .fig-zoom, .fig.sm .fig-zoom { display: none; }
.fig.xs img { max-width: min(100%, 15rem); }
.fig.sm img { max-width: min(100%, 24rem); }
.fig figcaption { font-size: 0.9rem; color: var(--ink-2); max-width: 36rem; }
/* compact by default, so a video never forces a long scroll: the size follows the
   video's own ratio (--w / --h set on the figure), hover enlarges, the button pins it open */
.video-fig { position: relative; z-index: 1; max-width: 100%; }
.video-frame {
  position: relative; padding: 6px; border: 1.5px solid var(--line); border-radius: 10px; background: var(--paper);
  width: min(100%, 26rem, calc(18rem * var(--w, 16) / var(--h, 9)));
  max-width: 100%; transform-origin: top left;
  transition: width 0.3s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s;
}
.video-frame video { display: block; width: 100%; height: auto; border-radius: 5px; }
.video-fig.is-open .video-frame { width: min(100%, 44rem, calc(70vh * var(--w, 16) / var(--h, 9))); }
.video-zoom {
  position: absolute; top: 10px; right: 10px; z-index: 1; display: grid; place-items: center; width: 2rem; height: 2rem;
  border: 0; border-radius: 8px; background: rgba(21, 34, 26, 0.82); color: #fff; cursor: zoom-in;
}
.video-zoom svg { width: 1.1rem; height: 1.1rem; }
.video-fig.is-open .video-zoom { cursor: zoom-out; }
@media (hover: hover) and (pointer: fine) and (min-width: 640px) {
  .video-fig:hover .video-frame {
    transform: scale(1.4); z-index: 2; box-shadow: 0 12px 32px rgba(21, 34, 26, 0.22);
    transition-delay: 0.2s;
  }
  .video-fig.is-open:hover .video-frame { transform: none; box-shadow: none; }
}

/* ───────── placeholders (author mode only) ───────── */
.ph {
  display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.9rem; align-items: start;
  padding: 0.9rem; border: 2px dashed var(--amber); border-radius: var(--r);
  background: repeating-linear-gradient(-45deg, transparent 0 10px, color-mix(in srgb, var(--amber-soft) 55%, transparent) 10px 20px);
}
.ph-art {
  display: grid; place-items: center; width: 3.4rem; height: 3.4rem; border-radius: 10px;
  background: var(--amber-soft); color: var(--amber);
}
.ph-art svg { width: 1.7rem; height: 1.7rem; }
.ph[data-kind="gif"] .ph-art svg { animation: wobble 2.4s ease-in-out infinite; }
@keyframes wobble { 0%, 100% { transform: rotate(0); } 25% { transform: rotate(-8deg); } 75% { transform: rotate(8deg); } }
.ph-tag {
  display: inline-block; font-family: var(--font-mono); font-size: 0.68rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase; color: var(--amber);
}
.ph-title { display: block; font-weight: 700; line-height: 1.3; }
.todo-list { list-style: none; margin: 0.5rem 0 0; padding: 0; display: grid; gap: 0.3rem; font-size: 0.92rem; }
.todo-list label { display: grid; grid-template-columns: 1.3rem minmax(0, 1fr); gap: 0.5rem; align-items: start; cursor: pointer; }
.todo-list input { width: 1.1rem; height: 1.1rem; margin: 0.25rem 0 0; accent-color: var(--amber); }
.todo-list input:checked + span { text-decoration: line-through; color: var(--ink-3); }
body:not(.author) .ph, body:not(.author) .author-only { display: none; }

/* ───────── callouts, quotes, cards ───────── */
.callout {
  display: grid; grid-template-columns: 2.25rem minmax(0, 1fr); gap: 0.8rem; padding: 0.9rem 1rem;
  border-radius: var(--r); background: var(--tone-soft); max-width: 40rem;
}
.callout-ico { display: grid; place-items: center; width: 2.25rem; height: 2.25rem; border-radius: 50%; background: var(--tone); color: var(--surface); }
.callout-ico svg { width: 1.25rem; height: 1.25rem; }
.callout-title { display: block; font-family: var(--font-display); font-weight: 700; color: var(--tone); line-height: 1.3; }
.callout p { margin: 0.15rem 0 0; }
.tone-note { --tone: var(--sky); --tone-soft: var(--sky-soft); }
.tone-tip { --tone: var(--grass); --tone-soft: var(--grass-soft); }
.tone-warn { --tone: var(--amber); --tone-soft: var(--amber-soft); }
.tone-goal { --tone: var(--route); --tone-soft: var(--route-soft); }

.quote {
  margin: 0; padding: 1.1rem 1.2rem 1.2rem; background: var(--surface); border: 1.5px solid var(--ink);
  border-radius: 4px var(--r) var(--r) var(--r); box-shadow: 5px 5px 0 var(--line); max-width: 40rem;
}
.quote .mono-label { display: inline-block; margin-bottom: 0.5rem; color: var(--ink); background: var(--surface-2); padding: 0.1rem 0.45rem; border-radius: 4px; }
.quote p { margin: 0; font-size: 1.06em; line-height: 1.55; }

.cards { display: grid; gap: 0.8rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.card { padding: 1rem 1.1rem 1.1rem; background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--r); display: grid; gap: 0.35rem; align-content: start; }
.card-n {
  width: 2rem; height: 2rem; display: grid; place-items: center; border-radius: 50%;
  font-family: var(--font-mono); font-weight: 700; background: var(--ink); color: var(--surface);
}
.card-title { font-family: var(--font-display); font-weight: 700; font-size: 1.1rem; line-height: 1.25; }
.card p { margin: 0; color: var(--ink-2); }
.card-top { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; }
.card-ico {
  width: 3.1rem; height: 3.1rem; display: grid; place-items: center; border-radius: var(--r-sm);
  background: var(--tone-soft, var(--surface-2)); color: var(--tone, var(--ink)); border: 1.5px solid var(--tone, var(--line));
}
.card-ico svg { width: 1.9rem; height: 1.9rem; }

/* ───────── icon row: small pictures with a label ───────── */
.icon-row { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 1rem 1.8rem; }
.icon-row li { display: grid; justify-items: center; gap: 0.4rem; }
.icon-row img {
  width: 4.5rem; height: 4.5rem; object-fit: contain; padding: 0.35rem;
  background: #fff; border: 1px solid var(--line); border-radius: var(--r);
}
.icon-row span { font-size: 0.92rem; color: var(--ink-2); }

/* ───────── model path card ───────── */
.pathcard {
  display: grid; gap: 0.8rem; padding: 1rem; border-radius: var(--r); background: var(--surface);
  border: 1.5px solid var(--route); max-width: 40rem;
}
.pathcard-head { display: flex; align-items: center; justify-content: space-between; gap: 0.6rem; flex-wrap: wrap; }
.pathcard-head .mono-label { color: var(--route); }
.tree { list-style: none; margin: 0; padding: 0; font-size: 0.98rem; }
.tree li {
  display: flex; align-items: center; gap: 0.5rem; min-height: 2rem; padding-left: calc(var(--d) * 1.15rem);
  position: relative; animation: unfold 0.35s var(--ease) both; animation-delay: calc(var(--d) * 90ms + 80ms);
}
.tree li::before {
  content: ""; position: absolute; left: calc(var(--d) * 1.15rem - 0.75rem); top: -0.2rem; width: 0.55rem; height: 1.25rem;
  border-left: 1.5px solid var(--line); border-bottom: 1.5px solid var(--line); border-bottom-left-radius: 5px;
}
.tree li:first-child::before { display: none; }
.tree svg { width: 1.2rem; height: 1.2rem; flex: none; color: var(--ink-2); }
.tree li.target { font-weight: 700; }
.tree li.target span { background: var(--route-soft); color: var(--route); padding: 0.05rem 0.45rem; border-radius: 6px; }
.tree li.target svg { color: var(--route); }
.tree .tkind { font-family: var(--font-mono); font-size: 0.68rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 400; }
@keyframes unfold { from { opacity: 0; transform: translateX(-8px); } to { opacity: 1; transform: none; } }
.path-note { font-size: 0.9rem; color: var(--ink-2); margin: 0; }
.unset-note { font-family: var(--font-mono); font-size: 0.75rem; color: var(--amber); background: var(--amber-soft); padding: 0.3rem 0.55rem; border-radius: 6px; }

/* ───────── copy field ───────── */
.copyfield {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 0.2rem 0.8rem;
  padding: 0.6rem 0.6rem 0.6rem 0.9rem; border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface);
  max-width: 34rem;
}
.copyfield .mono-label { grid-column: 1; }
.copyfield code { grid-column: 1; font-family: var(--font-mono); font-size: 1rem; font-weight: 700; overflow-wrap: anywhere; white-space: pre-line; }
.copyfield .btn { grid-column: 2; grid-row: 1 / span 2; }

/* ───────── questions, notes, answers ───────── */
.question { display: grid; gap: 1rem; padding: 1.2rem; background: var(--surface); border: 2px solid var(--amber); border-radius: var(--r); max-width: 42rem; }
.q-prompt { margin: 0; font-family: var(--font-display); font-weight: 700; font-size: 1.3rem; line-height: 1.25; text-wrap: balance; }
.q-options { display: grid; gap: 0.6rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 11rem), 1fr)); }
.q-opt { position: relative; }
.q-opt input { position: absolute; opacity: 0; inset: 0; }
.q-opt span {
  display: flex; align-items: center; gap: 0.7rem; padding: 0.85rem 1rem; border: 2px solid var(--line);
  border-radius: 10px; font-weight: 700; cursor: pointer; transition: border-color 0.2s, background 0.2s, transform 0.2s var(--ease);
}
.q-opt span::before { content: ""; width: 1.25rem; height: 1.25rem; border-radius: 50%; border: 2px solid var(--ink-3); flex: none; transition: box-shadow 0.2s, border-color 0.2s; }
.q-opt input:checked + span { transform: scale(1.02); }
/* one color per option: 1st option blue, 2nd option green */
.q-opt:nth-child(1) input:checked + span { border-color: var(--sky); background: var(--sky-soft); }
.q-opt:nth-child(1) input:checked + span::before { border-color: var(--sky); box-shadow: inset 0 0 0 4px var(--sky-soft), inset 0 0 0 10px var(--sky); }
.q-opt:nth-child(2) input:checked + span { border-color: var(--grass); background: var(--grass-soft); }
.q-opt:nth-child(2) input:checked + span::before { border-color: var(--grass); box-shadow: inset 0 0 0 4px var(--grass-soft), inset 0 0 0 10px var(--grass); }
.q-opt input:focus-visible + span { outline: 3px solid var(--sky); outline-offset: 2px; }
.field { display: grid; gap: 0.3rem; }
.field label { font-weight: 700; font-size: 0.92rem; }
.field input[type="text"], .field textarea {
  width: 100%; padding: 0.65rem 0.8rem; border: 1.5px solid var(--ink-3); border-radius: 8px; background: var(--surface);
  line-height: 1.5;
}
.field textarea { min-height: 6.5rem; resize: vertical; }
.field input:focus, .field textarea:focus { outline: 3px solid var(--sky-soft); border-color: var(--sky); }
.q-list { display: grid; gap: 0.6rem; }
.q-item { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: 0.6rem; align-items: center; }
.q-item b { display: grid; place-items: center; width: 2rem; height: 2rem; border-radius: 50%; background: var(--amber-soft); color: var(--amber); font-family: var(--font-mono); }
.saved { font-family: var(--font-mono); font-size: 0.75rem; color: var(--grass); opacity: 0; transition: opacity 0.3s; }
.saved.show { opacity: 1; }
.q-call { display: flex; align-items: center; gap: 0.6rem; padding: 0.7rem 0.9rem; border-radius: var(--r); background: var(--amber-soft, var(--surface)); color: var(--ink); font-weight: 600; }
.q-call[hidden] { display: none; }
.q-call svg { width: 1.6rem; height: 1.6rem; flex: none; }

/* ───────── links to the scenes of another guide (Part 1) ───────── */
.recall { display: grid; gap: 0.5rem; padding: 0.8rem 0.9rem; border: 1.5px dashed var(--sky); border-radius: var(--r); max-width: 40rem; }
.recall .mono-label { color: var(--sky); }
.recall-list { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.recall-item {
  display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.35rem 0.7rem; border-radius: 999px;
  background: var(--sky-soft); color: var(--sky); font-weight: 600; font-size: 0.92rem; text-decoration: none; line-height: 1.3;
}
.recall-item:hover { text-decoration: underline; }
.recall-item svg { width: 0.95rem; height: 0.95rem; flex: none; }
.xlink { color: var(--sky); font-weight: 600; text-underline-offset: 2px; }
.xlink svg { width: 0.85em; height: 0.85em; margin-left: 0.2em; vertical-align: -0.05em; }
.link-ready { font-family: var(--font-mono); font-weight: 700; color: var(--grass); }
/* A pink frame around the drone button of the top bar, bouncing to invite a click. Kept even when the
   phone asks for reduced motion: this is the one movement the step asks for. */
#sim-btn.hint { color: #e4007c; background: rgba(255, 95, 162, 0.18); border: 2px solid #ff5fa2; border-radius: 8px; outline: 3px solid #ff5fa2; outline-offset: 3px; animation: sim-hint-bounce 0.9s ease-in-out infinite; }
@keyframes sim-hint-bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
.reveal.solution { max-width: none; }
.solution-cover { display: flex; flex-direction: column; align-items: center; gap: 0.6rem; width: 100%; padding: 1.6rem 1rem; border: 2px dashed var(--line); border-radius: var(--r); background: var(--surface); color: var(--ink); font: inherit; font-weight: 700; cursor: pointer; }
.solution-cover { transition: padding 0.4s var(--ease); }
.solution-cover svg { width: 5rem; height: 5rem; flex: none; transition: width 0.4s var(--ease), height 0.4s var(--ease); }
.solution-cover .eye-open { display: none; }
.reveal.solution.open .solution-cover { padding: 0.5rem 1rem; }
.reveal.solution.open .solution-cover svg { width: 2.4rem; height: 2.4rem; }
.reveal.solution.open .solution-cover .eye-closed { display: none; }
.reveal.solution.open .solution-cover .eye-open { display: block; animation: solution-eye-open 0.4s var(--ease); }
@keyframes solution-eye-open { from { opacity: 0; transform: scaleY(0.2); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) {
  .solution-cover, .solution-cover svg, .reveal.solution.open .solution-cover .eye-open { transition: none; animation: none; }
}
.solution-cover .when-open { display: none; }
.reveal.solution.open .solution-cover .when-open { display: inline; }
.reveal.solution.open .solution-cover .when-closed { display: none; }
.reveal.solution .reveal-body > div { display: grid; gap: 1rem; }
.notes { display: grid; gap: 0.4rem; max-width: 42rem; }

.sheet-answers { display: grid; gap: 1rem; padding: 1.2rem; background: var(--surface); border: 1.5px solid var(--ink); border-radius: 4px var(--r) var(--r) var(--r); box-shadow: 5px 5px 0 var(--line); max-width: 44rem; }
.sheet-answers h2 { margin: 0; font-family: var(--font-display); font-size: 1.35rem; }
.ans { display: grid; gap: 0.15rem; padding-top: 0.8rem; border-top: 1.5px dashed var(--line); }
.ans .mono-label { color: var(--amber); }
.ans p, .ans ol { margin: 0; white-space: pre-wrap; overflow-wrap: anywhere; }
.ans ol { padding-left: 1.3rem; white-space: normal; }
.ans .empty { color: var(--ink-3); font-style: italic; }
.ans .why { color: var(--ink-2); }

/* ───────── reveal, faq, tabs ───────── */
.reveal { max-width: 40rem; }
.reveal-body { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.4s var(--ease); }
.reveal-body > div { overflow: hidden; }
.reveal.open .reveal-body { grid-template-rows: 1fr; }
.reveal-body p { margin: 0.7rem 0 0; padding: 0.8rem 1rem; background: var(--grass-soft); border-radius: 10px; }
.tip-toggle .tip-body { display: grid; gap: 0.7rem; margin-top: 0.7rem; padding: 0.9rem 1rem; background: var(--grass-soft); border-radius: 10px; }
.reveal-body .tip-body p { margin: 0; padding: 0; background: none; }
.tip-toggle .tip-body .copyfield { background: var(--surface); }

.faq { display: grid; gap: 0.5rem; max-width: 44rem; }
.faq-item { border: 1.5px solid var(--line); border-radius: 10px; background: var(--surface); overflow: hidden; }
.faq-q {
  display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 0.8rem; align-items: center; width: 100%;
  padding: 0.9rem 1rem; border: 0; background: transparent; text-align: left; font-weight: 700; line-height: 1.35;
}
.faq-q svg { width: 1.3rem; height: 1.3rem; transition: transform 0.3s var(--ease); color: var(--sky); }
.faq-item.open .faq-q svg { transform: rotate(45deg); }
.faq-a { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 0.4s var(--ease); }
.faq-a > div { overflow: hidden; }
.faq-item.open .faq-a { grid-template-rows: 1fr; }
.faq-a p { margin: 0 1rem 0.8rem; color: var(--ink-2); }
.faq-a p:last-child { margin-bottom: 1.1rem; }

.tabs { display: grid; gap: 0.8rem; }
.tablist { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tab {
  display: grid; text-align: left; padding: 0.55rem 0.9rem; border-radius: 10px; border: 1.5px solid var(--line);
  background: var(--surface); line-height: 1.25;
}
.tab b { font-family: var(--font-display); }
.tab small { color: var(--ink-3); font-size: 0.8rem; }
.tab[aria-selected="true"] { border-color: var(--sky); background: var(--sky-soft); }
.tabpanel { display: grid; gap: 0.8rem; animation: rise 0.35s var(--ease) both; }

/* ───────── dock ───────── */
.dock {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 30;
  display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 0.6rem;
  padding: 0.6rem var(--gutter) calc(0.6rem + env(safe-area-inset-bottom, 0px));
  background: color-mix(in srgb, var(--surface) 94%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-top: 1px solid var(--line);
}
.dock-inner { display: contents; }
.dock .btn { min-height: 3.1rem; }
.dock-back { padding-inline: 0.9rem; }
.dock-next { min-width: 8.5rem; justify-content: space-between; text-align: left; }
.dock-next .lbl { display: grid; line-height: 1.15; }
.dock-next small { font-weight: 400; font-size: 0.72rem; opacity: 0.85; max-width: 11rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.dock-next.ready { animation: nudge 1.6s ease-in-out 2; }
@keyframes nudge { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--route) 60%, transparent); } 50% { box-shadow: 0 0 0 10px transparent; } }
.dock-info { min-width: 0; display: grid; justify-items: center; gap: 0.1rem; font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); text-align: center; }
.dock-info b { color: var(--ink); font-size: 0.9rem; white-space: nowrap; }
.dock-info span { white-space: nowrap; }
.dock-back .txt { display: none; }
@media (min-width: 560px) { .dock-back .txt { display: inline; } }
@media (min-width: 900px) {
  .dock { grid-template-columns: 1fr minmax(0, 52rem) 1fr; }
  .dock-inner { grid-column: 2; display: grid; grid-template-columns: auto minmax(0, 1fr) auto; align-items: center; gap: 0.8rem; }
  .dock-next small { max-width: 16rem; }
  .leg b { display: block; }
  .route { height: 1.9rem; align-items: flex-end; padding-bottom: 0.55rem; }
  .route-drone { top: auto; bottom: 0.55rem; margin-top: 0; margin-bottom: -8px; }
  :root { --top-h: 4.9rem; }
}

/* ───────── overlays ───────── */
.ov { position: fixed; inset: 0; z-index: 60; display: grid; background: var(--scrim); animation: fade 0.25s ease-out both; }
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.ov-panel {
  position: relative; display: grid; grid-template-rows: auto minmax(0, 1fr); background: var(--surface); color: var(--ink);
  box-shadow: var(--shadow); max-height: 100%; min-height: 0;
}
.ov-head {
  display: flex; align-items: center; justify-content: space-between; gap: 0.8rem; padding: 0.9rem 1rem 0.8rem 1.2rem;
  border-bottom: 1px solid var(--line);
}
.ov-head h2 { margin: 0; font-family: var(--font-display); font-size: 1.25rem; line-height: 1.2; }
.ov-head .mono-label { display: block; }
.ov-body { overflow-y: auto; padding: 1.1rem 1.2rem calc(1.4rem + env(safe-area-inset-bottom, 0px)); overscroll-behavior: contain; }
.ov.drawer { justify-items: end; }
.ov.drawer .ov-panel { width: min(100%, 27rem); height: 100%; animation: slide-in 0.35s var(--ease) both; }
@keyframes slide-in { from { transform: translateX(40px); opacity: 0; } to { transform: none; opacity: 1; } }
.ov.dialog { place-items: end center; }
.ov.dialog .ov-panel { width: min(100%, 34rem); max-height: 88%; border-radius: 18px 18px 0 0; animation: sheet-up 0.35s var(--ease) both; }
.ov.dialog.wide .ov-panel { width: min(100%, 46rem); }
@keyframes sheet-up { from { transform: translateY(40px); opacity: 0; } to { transform: none; opacity: 1; } }
@media (min-width: 640px) {
  .ov.dialog { place-items: center; padding: 1.5rem; }
  .ov.dialog .ov-panel { border-radius: 18px; }
}
.ov.lightbox { background: rgba(8, 12, 10, 0.94); grid-template-rows: auto minmax(0, 1fr); }
.lb-bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.6rem var(--gutter); color: #e8f0e4; font-size: 0.9rem; }
.lb-bar .icon-btn { color: #e8f0e4; border-color: rgba(255, 255, 255, 0.3); }
.lb-bar .icon-btn:hover { background: rgba(255, 255, 255, 0.12); }
.lb-scroll { overflow: auto; display: grid; place-items: center; padding: 0 var(--gutter) 1.5rem; }
.lb-scroll img { background: #fff; border-radius: 6px; max-width: 100%; max-height: 100%; height: auto; width: auto; cursor: zoom-in; animation: sheet-up 0.3s var(--ease) both; }
.lb-scroll.zoomed { place-items: start; }
.lb-scroll.zoomed img { max-width: none; max-height: none; cursor: zoom-out; }

/* flight plan (table of contents) */
.toc { display: grid; gap: 1.2rem; }
.toc-ch { display: grid; gap: 0.3rem; }
.toc-ch-head { display: flex; align-items: baseline; gap: 0.6rem; }
.toc-ch-head .crumb-code { font-size: 0.72rem; }
.toc-ch-head b { font-family: var(--font-display); font-size: 1.05rem; }
.toc-ch-head span:last-child { margin-left: auto; font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); }
.toc-list { list-style: none; margin: 0; padding: 0 0 0 0.55rem; border-left: 2px dashed var(--line); display: grid; }
.toc-item {
  display: grid; grid-template-columns: 1.1rem minmax(0, 1fr) auto; gap: 0.6rem; align-items: center; width: 100%;
  padding: 0.45rem 0.6rem; border: 0; border-radius: 8px; background: transparent; text-align: left; line-height: 1.3;
}
.toc-item:hover { background: var(--surface-2); }
.toc-item[aria-current="true"] { background: var(--route-soft); color: var(--route); font-weight: 700; }
.dot { width: 0.8rem; height: 0.8rem; border-radius: 50%; border: 2px solid var(--ink-3); justify-self: center; }
.dot.seen { border-color: var(--route); }
.dot.part { border-color: var(--route); background: linear-gradient(90deg, var(--route) 50%, transparent 50%); }
.dot.done { border-color: var(--grass); background: var(--grass); }
.toc-kind { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--ink-3); }
.menu-group { display: grid; gap: 0.5rem; padding-top: 1rem; border-top: 1.5px dashed var(--line); }
.menu-row { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.switch { position: relative; display: inline-flex; align-items: center; gap: 0.6rem; cursor: pointer; font-weight: 600; }
.switch input { position: absolute; opacity: 0; }
.switch i { width: 2.6rem; height: 1.5rem; border-radius: 999px; background: var(--line); position: relative; transition: background 0.2s; flex: none; }
.switch i::after { content: ""; position: absolute; top: 3px; left: 3px; width: 1.125rem; height: 1.125rem; border-radius: 50%; background: var(--surface); transition: transform 0.25s var(--ease); box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3); }
.switch input:checked + i { background: var(--grass); }
.switch input:checked + i::after { transform: translateX(1.1rem); }
.switch input:focus-visible + i { outline: 3px solid var(--sky); outline-offset: 2px; }

/* authoring board */
.board { display: grid; gap: 1.4rem; }
.board h3 { margin: 0 0 0.4rem; font-family: var(--font-display); font-size: 1.05rem; }
.board-item { display: grid; gap: 0.2rem; padding: 0.7rem 0; border-top: 1.5px dashed var(--line); }
.board-item .btn { justify-self: start; margin-top: 0.3rem; }
.board-where { font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-3); }
.board p { margin: 0; }
.pill { display: inline-block; font-family: var(--font-mono); font-size: 0.7rem; font-weight: 700; padding: 0.1rem 0.5rem; border-radius: 999px; background: var(--amber-soft); color: var(--amber); }

#toast {
  position: fixed; left: 50%; bottom: calc(var(--dock-h) + 1.2rem + env(safe-area-inset-bottom, 0px)); z-index: 80;
  transform: translate(-50%, 20px); opacity: 0; pointer-events: none; padding: 0.55rem 1rem; border-radius: 999px;
  background: var(--ink); color: var(--bg); font-weight: 700; font-size: 0.92rem; white-space: nowrap;
  transition: opacity 0.25s, transform 0.25s var(--ease);
}
#toast.show { opacity: 1; transform: translate(-50%, 0); }

.confetti { position: fixed; inset: 0; pointer-events: none; z-index: 70; overflow: hidden; }
.confetti i { position: absolute; top: -12px; width: 9px; height: 14px; border-radius: 2px; animation: fall linear forwards; }
@keyframes fall { to { transform: translate3d(var(--dx), 105vh, 0) rotate(var(--rot)); opacity: 0.9; } }

/* ───────── widgets: shared ───────── */
.w { display: grid; gap: 1rem; padding: 1rem; background: var(--surface); border: 1.5px solid var(--line); border-radius: var(--r); }
.w svg { display: block; width: 100%; height: auto; }
.w svg text { font-family: var(--font-body); fill: var(--ink); }
.w-caption { margin: 0; color: var(--ink-2); font-size: 0.95rem; max-width: 38rem; }
.w-live { min-height: 3.2em; padding: 0.7rem 0.9rem; border-radius: 10px; background: var(--surface-2); }
.w-live b { color: var(--route); }
.w-live.ok { background: var(--grass-soft); }
.w-live.no { background: var(--danger-soft); }
.shake { animation: shake 0.4s ease-in-out; }
@keyframes shake { 20% { transform: translateX(-6px); } 40% { transform: translateX(6px); } 60% { transform: translateX(-4px); } 80% { transform: translateX(4px); } }
.chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.chip {
  display: inline-flex; align-items: center; gap: 0.4rem; min-height: 2.6rem; padding: 0.3rem 0.9rem; border-radius: 999px;
  border: 2px solid var(--ink-3); background: var(--surface); font-weight: 700; transition: transform 0.15s var(--ease), background 0.2s, border-color 0.2s;
}
.chip svg { width: 1.1rem; height: 1.1rem; }
.chip:hover { border-color: var(--ink); }
.chip[aria-pressed="true"] { border-color: var(--route); background: var(--route-soft); color: var(--route); transform: translateY(-2px); box-shadow: 0 4px 0 -1px var(--route); }
.chip[disabled] { border-color: var(--grass); background: var(--grass-soft); color: var(--grass); cursor: default; }

/* generic SVG vocabulary shared by the diagrams */
.s-box { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.4; }
.s-frame { fill: var(--surface-2); stroke: var(--ink-3); stroke-width: 1.2; }
.s-line { fill: none; stroke: var(--ink-2); stroke-width: 1.4; }
.s-head { fill: var(--ink-2); stroke: none; }
.s-dash { stroke-dasharray: 5 4; }
.s-dot { fill: var(--ink); }
.s-name { font-size: 11px; font-weight: 700; }
.s-sub { font-size: 9.5px; fill: var(--ink-2) !important; }
.s-lbl { font-size: 10.5px; font-weight: 700; }
.s-token { fill: var(--danger); stroke: var(--surface); stroke-width: 2; }
.s-muted { opacity: 0.35; }

/* ───────── cover ───────── */
.cover { display: grid; gap: 1.6rem; }
.cover-hero { display: grid; gap: 1.2rem; align-items: center; }
.cover-kicker { font-family: var(--font-mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--route); font-weight: 700; }
.cover h1 { max-width: 16ch; font-size: clamp(2.1rem, 1.3rem + 4.2vw, 3.9rem); line-height: 1.02; }
.cover-sub { margin: 0; font-size: 1.1em; color: var(--ink-2); max-width: 32rem; }
.cover-authors { margin: 0; font-size: 0.9rem; color: var(--ink-3); }
.cover-art { border-radius: var(--r); border: 1.5px solid var(--line); background: var(--surface); overflow: hidden; }
.cover-art svg { display: block; width: 100%; height: auto; }
.cover-art .c-route { fill: none; stroke: var(--route); stroke-width: 2.5; stroke-dasharray: 9 8; animation: march-17 1.2s linear infinite; }
/* Each dashed line moves by exactly one pattern (the sum of its dasharray), so the loop has no jump. */
@keyframes march-10 { to { stroke-dashoffset: -10; } }
@keyframes march-14 { to { stroke-dashoffset: -14; } }
@keyframes march-17 { to { stroke-dashoffset: -17; } }
.cover-art .c-wp { fill: var(--surface); stroke: var(--route); stroke-width: 2.5; }
.cover-art .c-wp.end { fill: var(--route); }
.cover-art .c-lbl { font-family: var(--font-mono); font-size: 11px; font-weight: 700; fill: var(--ink-2); }
.cover-art .c-grid { stroke: var(--bg-line); stroke-width: 1; }
.cover-art .c-zone { fill: var(--pasture); fill-opacity: 0.45; stroke: var(--pasture-edge); stroke-width: 1.2; stroke-dasharray: 3 3; }
.how { display: grid; gap: 0.7rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 13.5rem), 1fr)); }
.how > div { display: grid; grid-template-columns: auto minmax(0, 1fr); gap: 0.7rem; align-items: start; padding: 0.85rem; border-radius: var(--r); background: var(--surface); border: 1.5px solid var(--line); }
.how p { margin: 0; font-size: 0.95rem; color: var(--ink-2); }
.how b { display: block; color: var(--ink); }
.how .kind { padding: 0.35rem; }
@media (min-width: 860px) { .cover-hero { grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr); gap: 2rem; } }

/* ───────── nine diagrams ───────── */
.d9 { display: grid; gap: 0.6rem; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.d9-tile {
  display: grid; gap: 0.3rem; justify-items: start; text-align: left; padding: 0.7rem 0.75rem; border-radius: 12px;
  border: 1.5px solid var(--line); background: var(--surface); color: var(--ink-3); transition: transform 0.2s var(--ease), border-color 0.2s;
}
.d9-tile svg { width: 3rem; height: 2.2rem; }
.d9-tile b { font-family: var(--font-display); font-size: 0.98rem; line-height: 1.2; color: var(--ink-2); }
.d9-tile small { font-family: var(--font-mono); font-size: 0.66rem; letter-spacing: 0.05em; text-transform: uppercase; }
.d9-tile.used { border-color: var(--sky); background: var(--sky-soft); color: var(--sky); }
.d9-tile.used b { color: var(--ink); }
.d9-tile.also { border-style: dashed; border-color: var(--sky); color: var(--sky); }
.d9-tile:hover { transform: translateY(-2px); }
.d9-tile[aria-pressed="true"] { outline: 3px solid var(--sky); outline-offset: 2px; }
.scene.enter .d9-tile.used { animation: lightup 0.6s var(--ease) both; animation-delay: calc(0.5s + var(--k) * 140ms); }
@keyframes lightup { from { background: var(--surface); border-color: var(--line); transform: scale(0.94); } }

/* ───────── stages ───────── */
.stages { display: grid; gap: 0.6rem; }
.stage-row {
  display: grid; grid-template-columns: 3rem minmax(0, 1fr); gap: 0.9rem; align-items: center; padding: 0.9rem 1rem;
  border-radius: var(--r); background: var(--surface); border: 1.5px solid var(--line); margin-left: calc(var(--k) * clamp(0.6rem, 3vw, 2rem));
}
.stage-row .num { width: 3rem; height: 3rem; display: grid; place-items: center; border-radius: 50%; font-family: var(--font-display); font-weight: 800; font-size: 1.4rem; background: var(--stage, var(--ink)); color: var(--stage-ink, var(--surface)); }
.stage-row b { font-family: var(--font-display); font-size: 1.15rem; display: block; line-height: 1.2; }
.stage-row span { color: var(--ink-2); font-size: 0.95rem; }

/* ───────── scope ───────── */
.scope .soi { fill: var(--route-soft); stroke: var(--route); stroke-width: 2; stroke-dasharray: 8 6; animation: march-14 2.4s linear infinite; }
.scope .out { fill: var(--surface-2); stroke: var(--ink-3); stroke-width: 1.4; stroke-dasharray: 3 3; }
.scope .tag { font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.06em; }
.drone-body { fill: var(--ink); }
.drone-rotor { fill: var(--surface); stroke: var(--ink); stroke-width: 1.6; }

/* ───────── delete demo ───────── */
.dd { display: grid; gap: 0.8rem; }
.dd-panes { display: grid; gap: 0.8rem; grid-template-columns: minmax(0, 1fr); }
@media (min-width: 620px) { .dd-panes { grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr); } }
.dd-pane { border: 1.5px solid var(--ink-3); border-radius: 10px; overflow: hidden; background: var(--surface-2); }
.dd-pane h3 { margin: 0; padding: 0.35rem 0.7rem; font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; text-transform: uppercase; background: var(--ink); color: var(--surface); }
.dd-tree, .dd-canvas { padding: 0.7rem; min-height: 9.5rem; display: grid; gap: 0.4rem; align-content: start; }
.dd-canvas { grid-template-columns: repeat(auto-fit, minmax(7rem, 1fr)); background-image: radial-gradient(var(--line) 1px, transparent 1px); background-size: 14px 14px; }
.dd-el {
  display: flex; align-items: center; gap: 0.45rem; padding: 0.45rem 0.6rem; border-radius: 8px; border: 2px solid transparent;
  background: transparent; text-align: left; font-weight: 600; font-size: 0.92rem; transition: transform 0.3s var(--ease), opacity 0.3s;
}
.dd-el svg { width: 1.15rem; height: 1.15rem; flex: none; }
.dd-canvas .dd-el { background: var(--surface); border-color: var(--ink-2); justify-content: center; text-align: center; min-height: 3.4rem; }
.dd-el[aria-pressed="true"] { border-color: var(--route); background: var(--route-soft); color: var(--route); }
.dd-el.gone { opacity: 0; transform: scale(0.6) rotate(-6deg); pointer-events: none; }
.dd-el.ghost { opacity: 0.25; pointer-events: none; }

/* ───────── model tree widget ───────── */
.mt { display: grid; gap: 0.2rem; font-size: 0.98rem; }
.mt ul { list-style: none; margin: 0; padding: 0 0 0 1.25rem; border-left: 1.5px solid var(--line); margin-left: 0.6rem; }
.mt > ul { padding: 0; border: 0; margin: 0; display: grid; gap: 0.5rem; }
.mt-row { display: flex; align-items: center; gap: 0.45rem; width: 100%; min-height: 2.3rem; padding: 0.2rem 0.5rem; border: 0; border-radius: 8px; background: transparent; text-align: left; }
.mt-row:hover { background: var(--surface-2); }
.mt-row svg { width: 1.2rem; height: 1.2rem; flex: none; color: var(--ink-2); }
.mt-row .caret { width: 0.9rem; height: 0.9rem; transition: transform 0.25s var(--ease); color: var(--ink-3); }
.mt li.open > .mt-row .caret { transform: rotate(90deg); }
.mt li > ul { display: none; }
.mt li.open > ul { display: block; animation: unfold 0.3s var(--ease) both; }
.mt-top > .mt-row { font-family: var(--font-display); font-weight: 700; font-size: 1.08rem; background: var(--surface-2); border: 1.5px solid var(--line); }
.mt-leaf .mt-row { color: var(--route); font-weight: 700; }
.mt-leaf .mt-row svg { color: var(--route); }
.mt-made { font-family: var(--font-mono); font-size: 0.66rem; padding: 0 0.4rem; border-radius: 999px; background: var(--grass-soft); color: var(--grass); text-transform: uppercase; letter-spacing: 0.05em; }

/* ───────── mission ───────── */
.mission { display: grid; gap: 1rem; }
@media (min-width: 760px) { .mission { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); align-items: start; } }
.mission-text { display: grid; gap: 0.5rem; }
.mission-part {
  display: grid; grid-template-columns: 2.2rem minmax(0, 1fr); gap: 0.7rem; align-items: start; text-align: left; padding: 0.75rem 0.85rem;
  border-radius: 10px; border: 1.5px solid var(--line); background: var(--surface); line-height: 1.45; transition: border-color 0.2s, background 0.2s;
}
.mission-part b { width: 2.2rem; height: 2.2rem; display: grid; place-items: center; border-radius: 50%; background: var(--surface-2); font-family: var(--font-mono); }
.mission-part[aria-pressed="true"] { border-color: var(--route); background: var(--route-soft); }
.mission-part[aria-pressed="true"] b { background: var(--route); color: var(--on-route); }
.mission-art { border-radius: 10px; overflow: hidden; border: 1.5px solid var(--line); background: var(--surface-2); }
.m-zone { fill: var(--pasture); stroke: var(--pasture-edge); stroke-width: 2; }
.m-path { fill: none; stroke: var(--route); stroke-width: 2; stroke-dasharray: 7 5; }
.m-wool { fill: var(--wool); }
.m-face { fill: var(--surface); }
.m-eye { fill: var(--wool); }
.m-range { fill: var(--route); fill-opacity: 0.16; stroke: var(--route); stroke-width: 1.5; }
.m-alert { fill: var(--danger); }
.m-link { stroke: var(--danger); stroke-width: 2; stroke-dasharray: 4 4; fill: none; }
.m-tag { font-family: var(--font-mono); font-size: 10px; font-weight: 700; letter-spacing: 0.06em; }
.m-tagbox { fill: var(--pasture-edge); }
.m-tagbox + text { fill: var(--pasture) !important; }
.m-ping { fill: none; stroke: var(--danger); stroke-width: 2; transform-box: fill-box; transform-origin: center; animation: ping 1.2s ease-out infinite; }
@keyframes ping { from { transform: scale(0.4); opacity: 1; } to { transform: scale(2.2); opacity: 0; } }
.m-shepherd { fill: var(--ink); }

/* ───────── the bear comes closer (three steps) ───────── */
.b-track { fill: var(--sky-soft); stroke: var(--sky); stroke-width: 2; }
.w svg text.b-track-tag { fill: var(--sky); }
.b-bear { fill: var(--ink); }
.b-zone-danger { fill: var(--danger-soft); stroke: var(--danger); }
.b-range-danger { fill: var(--danger); stroke: var(--danger); }
.b-banner--ink { fill: var(--ink); }
.b-banner--amber { fill: var(--amber); }
.b-banner--danger { fill: var(--danger); }
.w svg text.b-banner-txt { fill: var(--surface); font-size: 11px; }
.b-cone { fill: var(--amber); fill-opacity: 0.35; }
.b-wave { fill: none; stroke: var(--danger); stroke-width: 2.4; stroke-linecap: round; animation: b-wave 1.1s ease-out infinite; }
@keyframes b-wave { from { opacity: 1; } to { opacity: 0.15; } }
@media (prefers-reduced-motion: reduce) { .b-wave, .m-ping { animation: none; } }
.marks .recap-row { grid-template-columns: 3.2rem minmax(0, 1fr) auto; }
.marks .recap-row .crumb-code { min-width: 2.6rem; text-align: center; }
.marks-total { margin: 0.3rem 0 0; font-family: var(--font-mono); font-size: 0.9rem; color: var(--ink-2); text-align: right; }
.marks-total b { color: var(--ink); }

/* ───────── scenario ───────── */
.scn-steps { margin: 0; padding-left: 1.8rem; display: grid; gap: 0.5rem; max-width: 38rem; font-size: 1.05em; line-height: 1.6; }
.scn-steps li::marker { font-family: var(--font-mono); font-weight: 700; color: var(--ink-2); }
.scn-steps span { border-radius: 4px; padding: 0.05em 0.1em; transition: background 0.3s, color 0.3s, box-shadow 0.3s; }
.scn.hl-op .a-op, .scn.hl-gs .a-gs, .scn.hl-soi .a-soi { color: var(--ink); font-weight: 700; }
.scn.hl-op .a-op { background: var(--amber-soft); box-shadow: 0 2px 0 var(--amber); }
.scn.hl-gs .a-gs { background: var(--sky-soft); box-shadow: 0 2px 0 var(--sky); }
.scn.hl-soi .a-soi { background: var(--route-soft); box-shadow: 0 2px 0 var(--route); }
.chip.c-op[aria-pressed="true"] { border-color: var(--amber); background: var(--amber-soft); color: var(--amber); box-shadow: 0 4px 0 -1px var(--amber); }
.chip.c-gs[aria-pressed="true"] { border-color: var(--sky); background: var(--sky-soft); color: var(--sky); box-shadow: 0 4px 0 -1px var(--sky); }

/* ───────── weather ───────── */
.weather { display: grid; gap: 0.8rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.wx { position: relative; overflow: hidden; display: grid; gap: 0.3rem; padding: 1.1rem; border-radius: var(--r); min-height: 12.5rem; align-content: end; border: 1.5px solid var(--line); }
.wx.sun { background: var(--amber-soft); }
.wx.rain { background: var(--sky-soft); }
.wx-code { font-family: var(--font-display); font-weight: 800; font-size: 2.6rem; line-height: 1; }
.wx.sun .wx-code { color: var(--amber); }
.wx.rain .wx-code { color: var(--sky); }
.wx b { font-family: var(--font-display); font-size: 1.2rem; }
.wx p { margin: 0; color: var(--ink-2); }
.wx code { font-family: var(--font-mono); font-size: 0.85rem; font-weight: 700; }
.wx-art { position: absolute; top: 0.6rem; right: 0.6rem; width: 5.5rem; height: 5.5rem; }
.wx.sun .rays { transform-origin: 50% 50%; animation: spin 14s linear infinite; stroke: var(--amber); }
.wx.sun .disc { fill: var(--amber); }
@keyframes spin { to { transform: rotate(360deg); } }
.wx.rain .cloud { fill: var(--sky); }
.wx.rain .drop { stroke: var(--sky); stroke-width: 3; stroke-linecap: round; animation: drip 0.9s linear infinite; }
.wx.rain .drop:nth-of-type(2) { animation-delay: 0.3s; }
.wx.rain .drop:nth-of-type(3) { animation-delay: 0.6s; }
@keyframes drip { from { transform: translateY(-6px); opacity: 0; } 30% { opacity: 1; } to { transform: translateY(16px); opacity: 0; } }

/* ───────── sequence ───────── */
.seq { display: grid; gap: 0.9rem; }
@media (min-width: 760px) { .seq { grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr); align-items: start; } }
.seq-art { max-width: 27rem; }
.seq.seq-solo { display: block; }
.seq-solo .seq-art { max-width: 12rem; }
.seq .ll-head { fill: var(--grass-soft); stroke: var(--ink-2); stroke-width: 1.3; }
.seq .ll-line { stroke: var(--ink-3); stroke-width: 1.2; stroke-dasharray: 5 4; }
.seq .act-bar { fill: var(--grass-soft); stroke: var(--ink-3); stroke-width: 1; }
.seq .msg { transition: opacity 0.3s; }
.seq .msg.hidden { opacity: 0; }
.seq .msg.now .s-line { stroke: var(--route); stroke-width: 2.4; }
.seq .msg.now .s-head { fill: var(--route); }
.seq .msg.now text { fill: var(--route); }
.seq .msg text { font-size: 10px; font-weight: 600; paint-order: stroke; stroke: var(--surface); stroke-width: 3px; stroke-linejoin: round; }
.seq-side { display: grid; gap: 0.7rem; }
.seq-steps { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.25rem; counter-reset: m; }
.seq-steps li { display: grid; grid-template-columns: 1.7rem minmax(0, 1fr); gap: 0.5rem; padding: 0.3rem 0.5rem; border-radius: 8px; font-size: 0.95rem; line-height: 1.4; color: var(--ink-3); transition: background 0.3s, color 0.3s; }
.seq-steps li b { font-family: var(--font-mono); }
.seq-steps li.shown { color: var(--ink); }
.seq-steps li.now { background: var(--route-soft); color: var(--ink); }
.seq-steps li.now b { color: var(--route); }

/* ───────── message to function ───────── */
.m2f .fn { fill: var(--sky-soft); stroke: var(--sky); stroke-width: 1.6; }
.m2f .hint { font-size: 10px; fill: var(--ink-3) !important; font-family: var(--font-mono); letter-spacing: 0.05em; }
.m2f .flow { stroke: var(--sky); stroke-width: 2; fill: none; stroke-dasharray: 5 5; animation: march-10 1.4s linear infinite; }

/* ───────── anatomy ───────── */
.anat { display: grid; gap: 0.9rem; }
@media (min-width: 760px) { .anat { grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr); align-items: center; } }
.anat-keys { display: grid; gap: 0.45rem; }
.anat-key { display: grid; grid-template-columns: 2rem minmax(0, 1fr); gap: 0.7rem; align-items: start; padding: 0.6rem 0.7rem; border-radius: 10px; border: 1.5px solid var(--line); background: var(--surface); text-align: left; line-height: 1.35; }
.anat-key i { font-style: normal; width: 2rem; height: 2rem; display: grid; place-items: center; border-radius: 50%; background: var(--ink); color: var(--surface); font-family: var(--font-mono); font-weight: 700; }
.anat-key b { display: block; font-family: var(--font-display); }
.anat-key span { color: var(--ink-2); font-size: 0.93rem; }
.anat-key[aria-pressed="true"] { border-color: var(--route); background: var(--route-soft); }
.anat-key[aria-pressed="true"] i { background: var(--route); color: var(--on-route); }
.anat .pin circle { fill: var(--ink); }
.anat .pin text { fill: var(--surface) !important; font-family: var(--font-mono); font-size: 10px; font-weight: 700; }
.anat [data-part] { transition: opacity 0.3s; }
.anat.focus [data-part]:not(.hot) { opacity: 0.25; }
.anat .hot .s-box { stroke: var(--route); stroke-width: 2.6; }
.anat .hot .s-line { stroke: var(--route); stroke-width: 2.6; }
.anat .hot .s-head { fill: var(--route); }
.anat .hot text { fill: var(--route) !important; }
.anat .hot.pin circle { fill: var(--route); }
.anat .hot.pin text { fill: var(--on-route) !important; }

/* ───────── element sketches: one drawing per step ───────── */
.sketch svg { width: 100%; max-width: 30rem; justify-self: center; }
.sketch .sk-hot { fill: var(--route-soft); }
.sketch .w-caption { max-width: none; width: 100%; text-align: center; }
.sketch .item-flow .s-line { stroke: var(--route); stroke-width: 2.4; }
.sketch .item-flow .s-head { fill: var(--route); }

/* ───────── item flow: kettle and cup ───────── */
.ifw-art { max-width: 34rem; }
.ifw-ctl { display: grid; gap: 0.5rem; }
.ifw .item, .ifw .drops { opacity: 0; transition: opacity 0.3s; }
.ifw.picked .item, .ifw.picked .drops { opacity: 1; }
.ifw .item .s-head { fill: var(--route); }
.ifw .item text { fill: var(--route) !important; }
.ifw .drop { stroke: var(--surface); stroke-width: 1.5; }
.ifw .drop.liquid { fill: var(--ink-3); }
.ifw .drop.water { fill: var(--sky); }
.ifw .drop.coffee { fill: #8a5a33; }
.ifw .steam { opacity: 0; transition: opacity 0.4s; }
.ifw .steam .s-line { stroke: var(--ink-3); stroke-linecap: round; }
.ifw.boiling .steam { opacity: 1; }

/* ───────── state machine ───────── */
.sm { display: grid; gap: 1rem; }
@media (min-width: 760px) { .sm { grid-template-columns: minmax(0, 24rem) minmax(0, 1fr); align-items: start; } }
.sm-art { position: relative; max-width: 21rem; width: 100%; margin-inline: auto; }
@media (min-width: 760px) { .sm-art { max-width: 26rem; } }
.sm .st .s-box { transition: stroke 0.25s, fill 0.25s, stroke-width 0.25s; }
.sm .st.was .s-box { stroke: var(--grass); stroke-width: 2; }
.sm .st.on .s-box { stroke: var(--danger); stroke-width: 3; fill: var(--danger-soft); }
.sm .st.on.pulse .s-box { animation: st-pulse 0.5s var(--ease); }
@keyframes st-pulse { 0% { stroke-width: 9; } 100% { stroke-width: 3; } }
.sm .frame.on .s-frame { stroke: var(--danger); stroke-width: 2; }
.sm .tr.was .s-line { stroke: var(--grass); stroke-width: 2; }
.sm .tr.was .s-head { fill: var(--grass); }
.sm .tr.fire .s-line { stroke: var(--danger); stroke-width: 2.6; }
.sm .tr.fire .s-head { fill: var(--danger); }
.sm .tr text { font-size: 10.5px; font-weight: 700; paint-order: stroke; stroke: var(--surface-2); stroke-width: 3px; stroke-linejoin: round; }
.sm .tr .q text { stroke: none; }
.sm .tr.todo .s-line { stroke-dasharray: 4 4; stroke: var(--route); }
.sm .tr.todo .s-head { fill: var(--route); }
.sm .tr.todo text.sig { display: none; }
.sm .tr .q { display: none; }
.sm .tr.todo .q { display: block; cursor: pointer; }
.sm .tr .q circle { fill: var(--route); }
.sm .tr .q text { fill: var(--on-route) !important; font-family: var(--font-mono); font-size: 12px; }
.sm .tr .hit { stroke: transparent; stroke-width: 30; fill: none; pointer-events: none; }
.sm .tr.todo .hit { pointer-events: stroke; cursor: pointer; }
.sm .tr.placed text.sig { animation: sig-in 0.5s var(--ease) both; fill: var(--grass) !important; transform-box: fill-box; transform-origin: center; }
@keyframes sig-in { from { opacity: 0; transform: scale(1.8); } }
.sm .st.target .s-box { stroke: var(--route); stroke-width: 2.4; stroke-dasharray: 5 4; cursor: pointer; }
.sm .st .act, .sm .st .act-rule { transition: opacity 0.3s; }
.sm .st.no-act .act, .sm .st.no-act .act-rule { opacity: 0; }
.sm .st.act-in .act { animation: sig-in 0.5s var(--ease) both; fill: var(--grass) !important; transform-box: fill-box; transform-origin: center; }
.sm .st.busy .act { fill: var(--danger) !important; animation: blink 0.7s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0.35; } }
.sm-panel { display: grid; gap: 0.8rem; align-content: start; }
.sm-now { display: grid; gap: 0.1rem; padding: 0.55rem 0.9rem; border-radius: 10px; background: var(--danger-soft); border: 2px solid var(--danger); }
.sm-now strong { font-family: var(--font-display); font-size: 1.2rem; line-height: 1.2; }
.sm-triggers { display: grid; gap: 0.4rem; grid-template-columns: repeat(2, minmax(0, 1fr)); }
.sm-trigger {
  display: flex; align-items: center; gap: 0.5rem; min-height: 2.6rem; padding: 0.35rem 0.7rem; border-radius: 8px; border: 1.5px solid var(--ink-3);
  background: var(--surface); text-align: left; font-weight: 600; font-size: 0.86rem; line-height: 1.2; transition: transform 0.12s, background 0.2s;
}
.sm-trigger span { min-width: 0; overflow-wrap: anywhere; }
.sm-trigger svg { width: 1.05rem; height: 1.05rem; flex: none; color: var(--ink-3); }
.sm-trigger:hover { border-color: var(--ink); background: var(--surface-2); }
.sm-trigger:active { transform: scale(0.97); }
.sm-trigger.flash-ok { background: var(--grass-soft); border-color: var(--grass); }
.sm-trigger.flash-no { background: var(--danger-soft); border-color: var(--danger); }
.sm-log { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.3rem; font-size: 0.9rem; min-height: 4.5rem; align-content: start; }
.sm-log li { display: grid; grid-template-columns: 1.2rem minmax(0, 1fr); gap: 0.4rem; padding: 0.3rem 0.5rem; border-radius: 6px; background: var(--surface-2); animation: rise 0.3s var(--ease) both; }
.sm-log li.no { background: var(--danger-soft); }
.sm-log li.auto { background: var(--sky-soft); }
.sm-menu {
  position: absolute; z-index: 5; display: grid; min-width: 9rem; padding: 0.25rem; border-radius: 8px; background: var(--paper); color: var(--paper-ink);
  border: 1px solid #999; box-shadow: 0 8px 24px -8px rgba(0, 0, 0, 0.5); animation: sheet-up 0.2s var(--ease) both;
}
.sm-menu button { padding: 0.45rem 0.8rem; border: 0; background: transparent; text-align: left; color: inherit; border-radius: 5px; font-size: 0.95rem; }
.sm-menu button:hover { background: #dbe6f8; }

/* ───────── sd vs ad ───────── */
.duo { display: grid; gap: 0.8rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr)); }
.duo-card { display: grid; gap: 0.5rem; padding: 1rem; border-radius: var(--r); border: 1.5px solid var(--line); background: var(--surface); align-content: start; }
.duo-card b { font-family: var(--font-display); font-size: 1.15rem; }
.duo-card p { margin: 0; color: var(--ink-2); font-size: 0.97rem; }
.duo-card .way { fill: none; stroke: var(--ink-2); stroke-width: 2; }
.duo-card .way.hot { stroke: var(--route); stroke-width: 3; stroke-dasharray: 8 6; animation: march-14 1.2s linear infinite; }
.duo-card .way.wet { stroke: var(--sky); stroke-width: 3; stroke-dasharray: 8 6; animation: march-14 1.2s linear infinite; }
.duo-card .node { fill: var(--surface); stroke: var(--ink-2); stroke-width: 2; }
.duo-card .sunny { fill: var(--amber); }
.duo-card .rainy { fill: var(--sky); }

/* ───────── decision and fork ───────── */
.dec { display: grid; gap: 0.9rem; }
.dec-ctl { display: grid; gap: 0.3rem; max-width: 26rem; }
.dec-ctl label { font-weight: 700; display: flex; justify-content: space-between; gap: 1rem; }
.dec-ctl output { font-family: var(--font-mono); color: var(--route); }
.dec-ctl input[type="range"] { width: 100%; accent-color: var(--route); height: 2rem; }
.dec .branch { transition: opacity 0.3s; }
.dec .branch.off { opacity: 0.3; }
.dec .branch.on .s-line { stroke: var(--route); stroke-width: 2.6; }
.dec .branch.on .s-head { fill: var(--route); }
.dec .branch.on .s-box { stroke: var(--route); stroke-width: 2.4; fill: var(--route-soft); }
.dec .branch.on .guard { fill: var(--route) !important; }
.dec .guard { font-family: var(--font-mono); font-size: 10.5px; font-weight: 700; }
.dec .diamond { fill: var(--surface); stroke: var(--ink-2); stroke-width: 1.6; }
.fk .bar { fill: var(--ink); }
.fk .act.run .s-box { stroke: var(--danger); stroke-width: 2.6; fill: var(--danger-soft); }
.fk-art, .dec-art { max-width: 30rem; }

/* ───────── crud ───────── */
.crud { display: grid; gap: 0.6rem; grid-template-columns: repeat(auto-fit, minmax(min(100%, 9rem), 1fr)); }
.crud div { display: grid; gap: 0.1rem; padding: 0.8rem 0.9rem; border-radius: 12px; background: var(--surface); border: 1.5px solid var(--line); }
.crud i { font-style: normal; font-family: var(--font-display); font-weight: 800; font-size: 2.2rem; line-height: 1; color: var(--sky); }
.crud b { font-family: var(--font-display); }

/* ───────── recap ───────── */
.recap { display: grid; gap: 0.5rem; }
.recap-row { display: grid; grid-template-columns: 2.2rem minmax(0, 1fr) auto; gap: 0.7rem; align-items: center; padding: 0.55rem 0.8rem; border-radius: 10px; background: var(--surface); border: 1.5px solid var(--line); width: 100%; text-align: left; }
.recap-row:hover { border-color: var(--ink-3); }
.recap-row .crumb-code { justify-self: center; }
.recap-row b { font-family: var(--font-display); }
.recap-row span:last-child { font-family: var(--font-mono); font-size: 0.78rem; color: var(--ink-3); }
.recap-row.done { background: var(--grass-soft); border-color: color-mix(in srgb, var(--grass) 50%, var(--line)); }
.recap-row.done span:last-child { color: var(--grass); font-weight: 700; }

/* ───────── small screens ───────── */
@media (max-width: 480px) {
  .scene-head { margin-bottom: 1.2rem; }
  .step { grid-template-columns: 2.2rem minmax(0, 1fr); gap: 0.7rem; padding: 0.7rem 0.75rem 0.7rem 0.6rem; }
  .step-n { width: 2.2rem; height: 2.2rem; }
  .step-split { grid-template-columns: minmax(0, 1fr); }
  .w { padding: 0.8rem; margin-inline: -4px; }
  .crumb-count { display: none; }
  .ph { grid-template-columns: minmax(0, 1fr); }
  .ph-art { width: 2.6rem; height: 2.6rem; }
  .copyfield { grid-template-columns: minmax(0, 1fr); }
  .copyfield .btn { grid-column: 1; grid-row: auto; justify-self: start; }
  .dock-next { min-width: 0; }
  .dock-next small { max-width: 8rem; }
  .dock { gap: 0.45rem; }
}

/* ───────── motion and print ───────── */
@media (prefers-reduced-motion: reduce) {
  /* the pasture of the simulation panel is the motion the student asked for: it keeps moving */
  *:not(.poc-scene *):not(#sim-btn.hint), *:not(.poc-scene *)::before, *:not(.poc-scene *)::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; scroll-behavior: auto !important; }
}
@media print {
  .top, .dock, .chart-bg, #toast, .ov, .ph, .btn-row, .recap, .scene-head .stamp-row, .waypoint-rule { display: none !important; }
  body { background: #fff; color: #000; }
  #stage { padding: 0; min-height: 0; }
  .sheet-answers { box-shadow: none; border-color: #000; max-width: none; }
}

/* Connection to Cameo */
#cameo-btn .dot { width: .6rem; height: .6rem; border-radius: 50%; background: var(--ink-3); flex: none; }
#cameo-btn[data-status="connected"] .dot { background: #2e9d57; }
#cameo-btn[data-status="connecting"] .dot, #cameo-btn[data-status="waiting"] .dot { background: #d4a017; }