:root {
  --cc-bg: #071018;
  --cc-surface: #10202c;
  --cc-surface-2: #173042;
  --cc-ink: #e8f4f6;
  --cc-muted: #a9c0c9;
  --cc-line: #245066;
  --cc-accent-1: #3ecbff;
  --cc-accent-2: #ffb020;
  --cc-accent-3: #b09cff;
  --cc-accent-4: #3ee0a4;
  --cc-link: #8adfff;
  --cc-danger: #ff8d86;
  --cc-ok: #7dface;
  --cc-focus: #ffe14a;
  --cc-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --cc-serif: "Signal Serif", "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --cc-sans: "Signal Sans", "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  --cc-mono: ui-monospace, "SFMono-Regular", "Cascadia Code", Consolas, monospace;
  --cc-radius: 18px;
  --nav-w: 280px;
  --bottom-h: 0px;
  color-scheme: dark;
}

html[data-theme="light"] {
  --cc-bg: #f3f6f7;
  --cc-surface: #ffffff;
  --cc-surface-2: #e7f1f4;
  --cc-ink: #102028;
  --cc-muted: #3c5360;
  --cc-line: #c5d6de;
  --cc-accent-1: #0b5f78;
  --cc-accent-2: #8a4f00;
  --cc-accent-3: #4c3e9e;
  --cc-accent-4: #0c6b48;
  --cc-link: #0b5f78;
  --cc-danger: #9d1c2f;
  --cc-ok: #0c6b48;
  --cc-focus: #8a4f00;
  --cc-shadow: 0 16px 40px rgba(16, 40, 52, 0.08);
  color-scheme: light;
}

html[data-theme="contrast"] {
  --cc-bg: #000000;
  --cc-surface: #000000;
  --cc-surface-2: #111111;
  --cc-ink: #ffffff;
  --cc-muted: #ffffff;
  --cc-line: #ffffff;
  --cc-accent-1: #ffe14a;
  --cc-accent-2: #7dfff2;
  --cc-accent-3: #ff9cf0;
  --cc-accent-4: #c6ff4a;
  --cc-link: #ffe14a;
  --cc-danger: #ffb4b4;
  --cc-ok: #c6ff4a;
  --cc-focus: #ffe14a;
  --cc-shadow: none;
  color-scheme: dark;
}

html[data-theme="dusk"] {
  --cc-bg: #140f22;
  --cc-surface: #241833;
  --cc-surface-2: #312246;
  --cc-ink: #f7f1ff;
  --cc-muted: #d2c4ea;
  --cc-line: #5a4678;
  --cc-accent-1: #f0a3ff;
  --cc-accent-2: #ffd27a;
  --cc-accent-3: #9eb6ff;
  --cc-accent-4: #8dffc0;
  --cc-link: #ffd27a;
  --cc-danger: #ffb0c4;
  --cc-ok: #8dffc0;
  --cc-focus: #ffffff;
  --cc-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

@font-face {
  font-family: "Signal Sans";
  src: local("Avenir Next"), local("Segoe UI"), local("Helvetica Neue"), local("Arial");
  font-display: swap;
  size-adjust: 100%;
  ascent-override: 92%;
  descent-override: 22%;
  line-gap-override: 0%;
}
@font-face {
  font-family: "Signal Serif";
  src: local("Iowan Old Style"), local("Palatino Linotype"), local("Palatino"), local("Georgia");
  font-display: swap;
  size-adjust: 100%;
  ascent-override: 90%;
  descent-override: 22%;
  line-gap-override: 0%;
}

html[data-font="sm"] { font-size: 15px; }
html[data-font="md"] { font-size: 17px; }
html[data-font="lg"] { font-size: 19px; }
html[data-font="xl"] { font-size: 22px; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  min-height: 100vh;
  background:
    radial-gradient(1200px 500px at 10% -10%, color-mix(in srgb, var(--cc-accent-1) 18%, transparent), transparent 50%),
    radial-gradient(900px 420px at 100% 0%, color-mix(in srgb, var(--cc-accent-3) 16%, transparent), transparent 46%),
    var(--cc-bg);
  color: var(--cc-ink);
  font-family: var(--cc-sans);
  line-height: 1.55;
}
body::before {
  content: "";
  pointer-events: none;
  position: fixed;
  inset: 0;
  background-image: linear-gradient(transparent 95%, color-mix(in srgb, var(--cc-accent-1) 12%, transparent) 100%);
  background-size: 100% 8px;
  opacity: 0.25;
  mix-blend-mode: screen;
}
html[data-theme="light"] body::before { opacity: 0.15; mix-blend-mode: multiply; }
html[data-theme="contrast"] body::before { display: none; }

a { color: var(--cc-link); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--cc-focus); outline-offset: 2px; }
.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: #111111;
  color: #ffffff;
  padding: 8px 12px;
  z-index: 20;
  border: 2px solid var(--cc-focus);
}
.skip:focus { top: 12px; }

.shell { display: grid; grid-template-columns: var(--nav-w) 1fr; min-height: 100vh; }
.rail {
  position: sticky;
  top: 0;
  height: 100vh;
  padding: 18px 14px 24px;
  border-right: 1px solid var(--cc-line);
  background: color-mix(in srgb, var(--cc-surface) 88%, transparent);
  backdrop-filter: blur(10px);
  overflow: auto;
}
.brand { display: flex; gap: 12px; align-items: center; text-decoration: none; color: inherit; margin-bottom: 18px; }
.mark {
  width: 42px; height: 42px; border-radius: 50%;
  border: 2px solid var(--cc-accent-1);
  box-shadow: inset 0 0 0 6px color-mix(in srgb, var(--cc-accent-2) 70%, transparent), inset 0 0 0 12px color-mix(in srgb, var(--cc-accent-3) 55%, transparent);
  flex: none;
}
.brand b { font-family: var(--cc-serif); font-size: 1.15rem; display: block; letter-spacing: -0.03em; }
.brand span { color: var(--cc-muted); font-size: 0.78rem; }
.rail nav { display: flex; flex-direction: column; gap: 4px; }
.menu-item, .bar-item, .menu-toggle, .brand-link {
  min-height: 44px;
}
.menu-item {
  display: flex; align-items: center; gap: 8px;
  width: 100%; text-align: left;
  color: inherit; text-decoration: none;
  background: transparent; border: 1px solid transparent;
  border-radius: 12px; padding: 6px 10px;
  font: inherit; cursor: pointer;
  box-sizing: border-box;
}
.menu-ico {
  width: 28px; height: 28px; flex: none;
  display: grid; place-items: center;
  border-radius: 8px;
  background: var(--cc-surface-2);
  color: var(--cc-accent-1);
  font-size: 0.95rem;
  line-height: 1;
}
.menu-copy { min-width: 0; display: grid; gap: 1px; }
.menu-label { font-weight: 700; line-height: 1.15; }
.menu-hint {
  color: var(--cc-muted);
  font-size: 0.72rem;
  font-weight: 500;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.menu-item[aria-current="page"], .bar-item[aria-current="page"] {
  background: color-mix(in srgb, var(--cc-accent-1) 18%, var(--cc-surface));
  border-color: var(--cc-accent-1);
  box-shadow: inset 3px 0 0 var(--cc-accent-1);
  color: var(--cc-ink);
}
.menu-item:hover, .rail a:hover {
  background: var(--cc-surface-2);
  border-color: var(--cc-line);
}
.menu-filter-status { min-height: 1.2em; margin: 0 0 8px; color: var(--cc-muted); font-size: 0.85rem; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--cc-accent-1); flex: none; }
.dot.a2 { background: var(--cc-accent-2); }
.dot.a3 { background: var(--cc-accent-3); }
.dot.a4 { background: var(--cc-accent-4); }
.rail-foot { margin-top: 18px; color: var(--cc-muted); font-size: 0.78rem; }

.top {
  display: flex; gap: 10px; align-items: center; justify-content: space-between;
  padding: 12px 18px; position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--cc-bg) 84%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--cc-line);
}
.search { display: flex; gap: 8px; flex: 1; max-width: 560px; }
.search input, input, select, textarea {
  font: inherit; color: inherit; background: var(--cc-surface);
  border: 1px solid var(--cc-line); border-radius: 12px; padding: 8px 10px;
}
.search input { flex: 1; min-width: 0; }
.icon-btn, button.solid, button.ghost {
  font: inherit; cursor: pointer; border-radius: 12px; padding: 8px 12px;
}
.icon-btn, button.ghost { background: var(--cc-surface); color: inherit; border: 1px solid var(--cc-line); }
button.solid { background: var(--cc-accent-1); color: #061018; border: 1px solid transparent; font-weight: 700; }
html[data-theme="light"] button.solid { color: #fff; }
html[data-theme="contrast"] button.solid { color: #000; }
button:disabled { opacity: 0.55; cursor: not-allowed; }

main { padding: 22px 22px 64px; max-width: 1180px; min-height: calc(100svh - 180px); }
h1 { font-family: var(--cc-serif); font-weight: 600; letter-spacing: -0.03em; font-size: clamp(1.8rem, 3vw, 3rem); line-height: 1.1; margin: 0 0 8px; }
h2 { font-family: var(--cc-serif); font-size: 1.45rem; margin: 1.4rem 0 0.4rem; }
h3 { font-size: 1.05rem; margin: 1rem 0 0.3rem; }
.lede { font-size: 1.08rem; max-width: 68ch; }
.muted { color: var(--cc-muted); }
.row { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.chips { display: flex; flex-wrap: wrap; gap: 6px; margin: 8px 0 14px; }
.chip {
  border: 1px solid var(--cc-line); border-radius: 999px; padding: 2px 10px;
  font-size: 0.82rem; background: var(--cc-surface);
}
.grid { display: grid; gap: 14px; }
.cards { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.card {
  display: block; text-decoration: none; color: inherit;
  background: var(--cc-surface); border: 1px solid var(--cc-line);
  border-radius: var(--cc-radius); padding: 14px 14px 12px;
  box-shadow: var(--cc-shadow);
}
.card header { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.card h2, .card h3 { margin: 0; }
.card p { margin: 8px 0 0; color: var(--cc-muted); }
.bar { height: 4px; border-radius: 99px; background: var(--cc-line); margin-top: 12px; overflow: hidden; }
.bar span { display: block; height: 100%; background: var(--cc-accent-1); }
.accent-2 .bar span, .tone-2 { background: var(--cc-accent-2); }
.accent-3 .bar span { background: var(--cc-accent-3); }
.accent-4 .bar span { background: var(--cc-accent-4); }

.hero {
  display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 18px; align-items: stretch;
  margin-bottom: 18px;
}
.hero-copy, .panel, .callout, .lesson-block, .player, .quiz, .studio, .sim, .topo-wrap, dialog {
  background: color-mix(in srgb, var(--cc-surface) 92%, transparent);
  border: 1px solid var(--cc-line);
  border-radius: var(--cc-radius);
}
.hero-copy { padding: 22px; }
.tape {
  margin-top: 16px; border-top: 1px dashed var(--cc-line); padding-top: 8px;
  font-family: var(--cc-mono); font-size: 0.78rem; color: var(--cc-muted);
  overflow: hidden; white-space: nowrap;
}
.tape b { color: var(--cc-accent-2); font-weight: 600; }
html[data-motion="full"] .tape span { display: inline-block; animation: tape 28s linear infinite; }
@keyframes tape { from { transform: translateX(0); } to { transform: translateX(-50%); } }
.bullseye {
  min-height: 220px; display: grid; place-items: center; position: relative;
}
.ring {
  position: absolute; border-radius: 50%; border: 2px solid var(--cc-accent-1);
  display: grid; place-items: center; text-align: center; padding: 8px;
}
.ring strong { font-family: var(--cc-serif); }
.figure { background: var(--cc-surface-2); border-radius: 16px; padding: 8px; overflow: auto; }
.figure svg, .mind svg { width: 100%; height: auto; display: block; aspect-ratio: 780 / 380; min-height: 180px; }
.figure figcaption { font-size: 0.85rem; color: var(--cc-muted); padding: 4px 6px 2px; }

.player { padding: 12px; margin: 12px 0; }
.ladder { width: 100%; overflow: auto; }
.controls { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 8px; }
.inspect { font-family: var(--cc-mono); font-size: 0.82rem; background: var(--cc-surface-2); padding: 8px; border-radius: 12px; }
.callout { padding: 12px 14px; margin: 12px 0; border-left: 4px solid var(--cc-accent-2); }
.callout.danger { border-left-color: var(--cc-danger); }
.callout.ok { border-left-color: var(--cc-accent-4); }
pre.log {
  font-family: var(--cc-mono); font-size: 0.8rem; line-height: 1.45;
  background: #061018; color: #d7f6ff; padding: 12px; border-radius: 12px; overflow: auto;
}
html[data-theme="contrast"] pre.log { background: #000; color: #fff; border: 1px solid #fff; }
.card-flip { min-height: 140px; }
.quiz { padding: 12px 14px; }
fieldset { border: 1px solid var(--cc-line); border-radius: 12px; margin: 0 0 12px; }
label.choice { display: flex; gap: 8px; align-items: flex-start; padding: 4px 0; }
.sources { font-size: 0.85rem; }
.sources li { margin: 4px 0; }

.studio { padding: 12px; display: grid; grid-template-columns: 190px 1fr 230px; gap: 10px; min-height: 70vh; }
.palette, .inspector { display: flex; flex-direction: column; gap: 6px; }
.canvas-wrap { position: relative; background:
  linear-gradient(var(--cc-line) 1px, transparent 1px),
  linear-gradient(90deg, var(--cc-line) 1px, transparent 1px);
  background-size: 24px 24px; background-color: color-mix(in srgb, var(--cc-bg) 70%, var(--cc-surface));
  border-radius: 14px; min-height: 640px; overflow: hidden;
}
.s-node {
  position: absolute; width: 168px; background: var(--cc-surface);
  border: 1px solid var(--cc-line); border-radius: 12px; padding: 8px;
  box-shadow: var(--cc-shadow);
}
.s-node header { font-weight: 700; font-size: 0.82rem; color: var(--cc-accent-1); }
.s-node.selected { border-color: var(--cc-focus); }
.links { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.sim { padding: 12px; display: grid; grid-template-columns: 280px 1fr; gap: 12px; }
.agents { display: grid; gap: 8px; }
.agent {
  display: grid; grid-template-columns: 1fr auto; gap: 6px; align-items: center;
  border: 1px solid var(--cc-line); border-radius: 12px; padding: 8px; background: var(--cc-surface);
}
.topo-wrap { display: grid; grid-template-columns: 1fr 280px; min-height: 72vh; overflow: hidden; }
.topo-wrap canvas { width: 100%; height: 100%; min-height: 520px; display: block; }
.fallback-map { padding: 16px; }
.mind { width: 100%; overflow: auto; }

dialog {
  color: inherit; max-width: min(560px, calc(100vw - 24px)); width: 100%;
  padding: 16px; border: 1px solid var(--cc-line);
}
dialog::backdrop { background: rgba(0, 0, 0, 0.55); }
.form-grid { display: grid; gap: 10px; }
.form-grid label { display: grid; gap: 4px; font-size: 0.92rem; }

.bottom {
  display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 6;
  background: var(--cc-surface); border-top: 1px solid var(--cc-line);
  grid-template-columns: repeat(6, minmax(0, 1fr));
}
.bottom a, .bottom button {
  background: transparent; border: 0; color: inherit; font: inherit;
  padding: 8px 4px 10px; text-decoration: none; text-align: center; font-size: 0.72rem;
}
.bottom [aria-current="page"] { color: var(--cc-accent-1); font-weight: 700; }
.sheet {
  position: fixed; inset: auto 8px calc(var(--bottom-h) + 8px) 8px;
  background: var(--cc-surface); border: 1px solid var(--cc-line); border-radius: 16px;
  padding: 10px; display: grid; gap: 6px; z-index: 7;
}
.sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.status { min-height: 1.2em; }

@media (max-width: 960px) {
  .hero, .studio, .sim, .topo-wrap { grid-template-columns: 1fr; }
  .studio { min-height: auto; }
  .canvas-wrap { min-height: 520px; }
}
@media (max-width: 640px) {
  .shell { grid-template-columns: 1fr; }
  .rail { display: none; }
  .bottom { display: grid; --bottom-h: 64px; }
  body { --bottom-h: 64px; }
  main { padding: 14px 12px calc(var(--bottom-h) + 28px); }
  .top { padding: 10px 12px; }
  button, .bottom a, .icon-btn { min-height: 44px; }
  .hero-copy { padding: 14px; }
}

html[data-motion="reduce"] *, html[data-motion="reduce"] *::before, html[data-motion="reduce"] *::after {
  animation: none !important;
  transition: none !important;
  scroll-behavior: auto !important;
}
@media (prefers-reduced-motion: reduce) {
  html:not([data-motion="full"]),
  html:not([data-motion="full"]) *,
  html:not([data-motion="full"]) *::before,
  html:not([data-motion="full"]) *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
html[data-theme="contrast"] .card,
html[data-theme="contrast"] .hero-copy,
html[data-theme="contrast"] .player,
html[data-theme="contrast"] button,
html[data-theme="contrast"] input,
html[data-theme="contrast"] select {
  border-width: 2px;
}
html[data-theme="contrast"] a { text-decoration: underline; }

.menu-item[hidden] { display: none !important; }
.rail-search { position: sticky; top: 0; z-index: 1; margin: 0 0 8px; background: var(--cc-surface); }
.rail-search input { width: 100%; min-height: 44px; box-sizing: border-box; }
.dock-stack {
  position: fixed;
  left: 14px;
  bottom: 14px;
  z-index: 12;
  width: min(340px, calc(100vw - 120px));
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}
.dock-stack .guide,
.dock-stack .audio-dock {
  position: static;
  left: auto;
  right: auto;
  bottom: auto;
  width: auto;
}
.dock-stack:has(#guide-panel:not([hidden])) .audio-dock {
  display: none;
}
.guide {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
}
.guide-toggle, .guide-chip, #guide-close, .guide-form button, .guide-form input {
  min-height: 44px;
}
.guide-toggle {
  align-self: flex-start;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  border-radius: 999px;
  padding: 0 16px;
  border: 1px solid var(--cc-accent-1);
  background: var(--cc-accent-1);
  color: #061018;
}
html[data-theme="light"] .guide-toggle { color: #fff; }
html[data-theme="contrast"] .guide-toggle { color: #000; }
.guide-panel {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: min(52vh, 420px);
  padding: 12px;
  border-radius: 18px;
  background: color-mix(in srgb, var(--cc-bg) 94%, transparent);
  border: 1px solid var(--cc-line);
  box-shadow: var(--cc-shadow);
  backdrop-filter: blur(12px);
}
.guide-panel[hidden] { display: none !important; }
#guide-log[hidden],
#guide-chips[hidden],
#guide-form[hidden],
#guide-mic[hidden] { display: none !important; }
.guide-panel { overflow: auto; }
.callflow-banner {
  margin: 0 0 12px;
  padding: 10px 12px;
  border: 2px solid var(--cc-accent-2, var(--cc-accent-1));
  border-radius: 12px;
  background: color-mix(in srgb, var(--cc-accent-1) 16%, var(--cc-bg));
}
.callflow-stage {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 10px;
  margin: 16px 0;
  perspective: 800px;
}
.callflow-hop {
  min-height: 88px;
  font: inherit;
  color: var(--cc-ink);
  background: var(--cc-surface, var(--cc-bg));
  border: 2px solid var(--cc-line);
  border-radius: 16px;
  cursor: pointer;
  transform: translateZ(12px);
}
.callflow-hop:focus-visible { outline: 3px solid var(--cc-accent-1); outline-offset: 3px; }
.callflow-hop.is-down { transform: translateZ(0) rotateX(8deg); border-color: var(--cc-accent-2, #f472b6); }
.callflow-hop-label, .callflow-hop-state { display: block; }
.callflow-math { display: flex; flex-wrap: wrap; gap: 12px; }
.callflow-math label { display: flex; flex-direction: column; gap: 4px; font-weight: 700; }
.callflow-math input { min-height: 44px; font: inherit; color: inherit; background: var(--cc-bg); border: 1px solid var(--cc-line); border-radius: 8px; padding: 0 8px; }
.callflow-result { font-size: 1.05rem; }
@media (max-width: 800px) {
  .callflow-stage { grid-template-columns: 1fr 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .callflow-hop, .callflow-hop.is-down { transform: none; }
}
.guide-bar { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.guide-bar h2 { margin: 0; font-size: 1.15rem; }
.guide-log {
  overflow: auto;
  min-height: 140px;
  max-height: 280px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.guide-bubble {
  margin: 0;
  max-width: 92%;
  padding: 8px 12px;
  border-radius: 14px;
  overflow-wrap: anywhere;
}
.guide-bubble.user {
  align-self: flex-end;
  background: var(--cc-accent-1);
  color: #061018;
}
html[data-theme="light"] .guide-bubble.user { color: #fff; }
html[data-theme="contrast"] .guide-bubble.user { color: #000; }
.guide-bubble.bot {
  align-self: flex-start;
  background: var(--cc-surface-2);
  border: 1px solid var(--cc-line);
}
.guide-chips { display: flex; flex-wrap: wrap; gap: 6px; }
.guide-chip {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  padding: 0 12px;
  border: 1px solid var(--cc-line);
  background: var(--cc-surface);
  color: inherit;
}
.guide-form { display: flex; gap: 8px; }
.guide-form input { flex: 1; min-width: 0; }
.guide-note { margin: 0; color: var(--cc-muted); font-size: 0.75rem; }