:root {
  --cc-bg: #f3f6f4;
  --cc-surface: #ffffff;
  --cc-ink: #10211c;
  --cc-muted: #3d534b;
  --cc-line: #d5e2dc;
  --cc-accent-1: #0b6e4a;
  --cc-accent-2: #0e7490;
  --cc-accent-3: #8a5a00;
  --cc-accent-4: #6d28d9;
  --cc-danger: #9f1239;
  --cc-ok: #067647;
  --cc-shadow: 0 18px 50px rgba(16, 33, 28, 0.08);
  --cc-font: 18px;
  --cc-radius: 18px;
  --rail: 272px;
  --top: 64px;
  color-scheme: light;
}

html[data-theme="orbit"] {
  --cc-bg: #07120f;
  --cc-surface: #10211c;
  --cc-ink: #e7f6f0;
  --cc-muted: #b7d0c6;
  --cc-line: #234238;
  --cc-accent-1: #3ddc97;
  --cc-accent-2: #5ee7ff;
  --cc-accent-3: #f5c16c;
  --cc-accent-4: #c4b5fd;
  --cc-danger: #ff8b9a;
  --cc-ok: #3ddc97;
  --cc-shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  color-scheme: dark;
}

html[data-theme="contrast"] {
  --cc-bg: #000000;
  --cc-surface: #0a0a0a;
  --cc-ink: #ffffff;
  --cc-muted: #f4f4f4;
  --cc-line: #ffffff;
  --cc-accent-1: #ffe14a;
  --cc-accent-2: #7dffe1;
  --cc-accent-3: #ffb020;
  --cc-accent-4: #ff8bd2;
  --cc-danger: #ff6b6b;
  --cc-ok: #b6ff4a;
  --cc-shadow: none;
  color-scheme: dark;
}

html[data-theme="aurora"] {
  --cc-bg: #141228;
  --cc-surface: #241c40;
  --cc-ink: #f7f3ff;
  --cc-muted: #ddd4f5;
  --cc-line: #4a3f72;
  --cc-accent-1: #7dffe1;
  --cc-accent-2: #9db7ff;
  --cc-accent-3: #ffd27a;
  --cc-accent-4: #f0abfc;
  --cc-danger: #ff9eb5;
  --cc-ok: #7dffe1;
  --cc-shadow: 0 18px 50px rgba(8, 6, 20, 0.45);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { font-size: var(--cc-font); }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(1200px 500px at 10% -10%, color-mix(in srgb, var(--cc-accent-1) 18%, transparent), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, color-mix(in srgb, var(--cc-accent-2) 14%, transparent), transparent 55%),
    var(--cc-bg);
  color: var(--cc-ink);
  font-family: "Avenir Next", "Segoe UI", ui-sans-serif, system-ui, sans-serif;
  line-height: 1.5;
}
button, input, select { font: inherit; color: inherit; }
a { color: var(--cc-accent-2); }
a:hover { color: var(--cc-accent-1); }
:focus-visible { outline: 3px solid var(--cc-accent-2); outline-offset: 2px; }
.skip {
  position: absolute;
  left: 12px;
  top: -40px;
  background: var(--cc-accent-1);
  color: #04140e;
  padding: 8px 12px;
  z-index: 5;
}
html[data-theme="lumen"] .skip { color: #ffffff; }
.skip:focus { top: 8px; }

.app {
  display: grid;
  grid-template-columns: var(--rail) 1fr;
  grid-template-rows: var(--top) 1fr;
  min-height: 100vh;
}
.top {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 18px;
  border-bottom: 1px solid var(--cc-line);
  background: color-mix(in srgb, var(--cc-surface) 88%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 3;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: inherit;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.brand svg { display: block; }
.search {
  flex: 1;
  max-width: 420px;
  background: var(--cc-bg);
  border: 1px solid var(--cc-line);
  border-radius: 999px;
  padding: 8px 14px;
}
.top-actions { margin-left: auto; display: flex; gap: 8px; }
.rail {
  border-right: 1px solid var(--cc-line);
  padding: 16px 12px 32px;
  overflow: auto;
  background: color-mix(in srgb, var(--cc-surface) 70%, transparent);
}
.rail h2 {
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cc-muted);
  margin: 8px 10px;
}
.rail a, .bottom-nav a {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  text-decoration: none;
  color: inherit;
  border-radius: 12px;
  padding: 8px 10px;
}
.rail a[aria-current="page"], .bottom-nav a[aria-current="page"] {
  background: color-mix(in srgb, var(--cc-accent-1) 18%, var(--cc-surface));
}
.main {
  padding: 28px 28px 72px;
  max-width: 1180px;
}
h1 {
  font-family: "Iowan Old Style", Palatino, Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0 0 12px;
  font-weight: 600;
}
h2 { font-size: 1.25rem; letter-spacing: -0.02em; margin: 0 0 8px; }
h3 { font-size: 1.05rem; margin: 0 0 6px; }
.lede { font-size: 1.1rem; max-width: 68ch; color: var(--cc-muted); }
.kicker {
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: var(--cc-accent-1);
  margin: 0 0 6px;
}
.card-grid, .stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  margin: 18px 0;
}
.card, .panel, .lesson-block {
  background: var(--cc-surface);
  border: 1px solid var(--cc-line);
  border-radius: var(--cc-radius);
  box-shadow: var(--cc-shadow);
}
.card {
  display: block;
  padding: 16px;
  text-decoration: none;
  color: inherit;
  min-height: 140px;
}
.card p, .panel p { color: var(--cc-muted); }
.panel { padding: 16px; }
.stat strong { display: block; font-size: 1.6rem; color: var(--cc-accent-1); }
.stack { display: flex; flex-direction: column; gap: 10px; }
.split { display: grid; grid-template-columns: minmax(260px, 360px) 1fr; gap: 16px; align-items: start; }
label { display: flex; flex-direction: column; gap: 4px; font-size: 0.92rem; }
input, select, textarea {
  background: var(--cc-bg);
  border: 1px solid var(--cc-line);
  border-radius: 10px;
  padding: 8px 10px;
}
textarea { min-height: 88px; }
.btn, .chip {
  border: 1px solid var(--cc-line);
  background: var(--cc-surface);
  border-radius: 999px;
  padding: 8px 14px;
  cursor: pointer;
  min-height: 44px;
}
.btn.primary { background: var(--cc-accent-1); color: #04140e; border-color: transparent; font-weight: 700; }
html[data-theme="lumen"] .btn.primary, html:not([data-theme]) .btn.primary { color: #ffffff; }
html[data-theme="contrast"] .btn.primary { color: #000; }
.chip-row, .flow-controls, .inline-form { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; }
.lesson-block { padding: 16px 18px; margin: 14px 0; }
.callout {
  border-left: 4px solid var(--cc-accent-2);
  padding: 8px 12px;
  background: color-mix(in srgb, var(--cc-accent-2) 10%, var(--cc-surface));
}
.callout.warn { border-color: var(--cc-accent-3); }
.callout.bad { border-color: var(--cc-danger); }
.figure { margin: 0; }
.figure svg, .ladder { width: 100%; height: auto; }
figcaption { color: var(--cc-muted); font-size: 0.9rem; margin-top: 6px; }
.diagram-bg { fill: color-mix(in srgb, var(--cc-bg) 70%, var(--cc-surface)); }
.diagram-card { fill: var(--cc-surface); stroke: var(--cc-line); }
.diagram-title { fill: var(--cc-ink); font-size: 15px; font-weight: 700; }
.diagram-sub, .diagram-edge-label { fill: var(--cc-muted); font-size: 12px; }
.diagram-edge { stroke: var(--cc-accent-1); stroke-width: 2; }
.diagram:not(.is-still) .diagram-edge {
  stroke-dasharray: 6 8;
  animation: dash 8s linear infinite;
}
.tone-2 .diagram-card { stroke: var(--cc-accent-2); }
.tone-3 .diagram-card { stroke: var(--cc-accent-3); }
.tone-4 .diagram-card { stroke: var(--cc-accent-4); }
@keyframes dash { to { stroke-dashoffset: -140; } }
.ladder-actor, .ladder-label { fill: var(--cc-ink); font-size: 13px; text-anchor: middle; }
.ladder-life { stroke: var(--cc-line); }
.ladder-msg, .ladder-head { stroke: var(--cc-muted); fill: var(--cc-muted); }
.ladder-msg.is-active, .ladder-head.is-active { stroke: var(--cc-accent-1); fill: var(--cc-accent-1); stroke-width: 3; }
.ladder-label.is-active { fill: var(--cc-accent-1); font-weight: 700; }
.inspect, .log {
  background: #07120f;
  color: #d8f5ea;
  border-radius: 12px;
  padding: 12px;
  overflow: auto;
}
html[data-theme="lumen"] .inspect, html[data-theme="lumen"] .log { background: #10211c; }
pre { white-space: pre-wrap; margin: 0; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.86rem; }
.choices { display: flex; flex-direction: column; gap: 8px; border: 0; margin: 0; padding: 0; }
.choices label {
  flex-direction: row;
  align-items: flex-start;
  gap: 8px;
  border: 1px solid var(--cc-line);
  border-radius: 12px;
  padding: 8px;
}
.card-face {
  min-height: 140px;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 18px;
  font-size: 1.15rem;
}
.progress-dot { width: 8px; height: 8px; border-radius: 99px; background: var(--cc-line); display: inline-block; }
.progress-dot.done { background: var(--cc-accent-1); }
.designer { display: grid; grid-template-columns: 200px 1fr 260px; gap: 12px; }
.palette, .hub-nav { display: flex; flex-direction: column; gap: 6px; }
.pal-btn { text-align: left; border: 1px solid var(--cc-line); background: var(--cc-surface); border-radius: 12px; padding: 8px; cursor: pointer; min-height: 44px; }
.board { min-height: 460px; }
.board-canvas {
  position: relative;
  min-height: 460px;
  background:
    linear-gradient(var(--cc-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--cc-line) 1px, transparent 1px);
  background-size: 24px 24px;
  border: 1px solid var(--cc-line);
  border-radius: 16px;
  overflow: auto;
}
.flow-node {
  position: absolute;
  width: 160px;
  text-align: left;
  background: var(--cc-surface);
  border: 1px solid var(--cc-line);
  border-radius: 12px;
  padding: 8px;
  display: flex;
  flex-direction: column;
  cursor: pointer;
}
.flow-node.is-selected { border-color: var(--cc-accent-1); box-shadow: 0 0 0 3px color-mix(in srgb, var(--cc-accent-1) 35%, transparent); }
.wire {
  position: absolute;
  height: 2px;
  background: var(--cc-accent-2);
  transform-origin: 0 50%;
  pointer-events: none;
}
.hub { display: grid; grid-template-columns: 220px 1fr; gap: 12px; }
.hub-nav button[aria-selected="true"] { border-color: var(--cc-accent-1); }
.coach { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--cc-line); }
.topo-layout { display: grid; grid-template-columns: 1fr 320px; gap: 12px; }
.topo-stage { min-height: 520px; position: relative; border-radius: 16px; overflow: hidden; background: #07120f; }
.topo-stage canvas { width: 100%; height: 520px; display: block; }
.static-map { position: relative; margin: 0; color: #e7f6f0; }
.static-hit { position: absolute; inset: 0; }
.map-btn {
  position: absolute;
  transform: translate(-10px, -10px);
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 99px;
  border: 0;
  background: transparent;
  color: transparent;
  cursor: pointer;
}
.check { flex-direction: row; align-items: center; gap: 8px; }
.trace { margin: 0; padding-left: 18px; }
.dialog[hidden] { display: none; }
.dialog {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 6;
  display: grid;
  place-items: center;
  padding: 18px;
}
.dialog .panel { width: min(520px, 100%); max-height: min(86vh, 760px); overflow: auto; }
.bottom-nav {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: var(--cc-surface);
  border-top: 1px solid var(--cc-line);
  z-index: 4;
  justify-content: space-around;
  padding: 6px 8px calc(6px + env(safe-area-inset-bottom));
}
.bottom-nav a { flex-direction: column; align-items: center; font-size: 0.78rem; min-width: 56px; min-height: 44px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.hero-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 18px; align-items: center; }
.pill { display: inline-flex; gap: 6px; align-items: center; border: 1px solid var(--cc-line); border-radius: 999px; padding: 4px 10px; color: var(--cc-muted); font-size: 0.85rem; }

@media (max-width: 960px) {
  .split, .designer, .hub, .topo-layout, .hero-grid { grid-template-columns: 1fr; }
  .app { grid-template-columns: 220px 1fr; }
}
@media (max-width: 640px) {
  .app { grid-template-columns: 1fr; }
  .rail { display: none; }
  .bottom-nav { display: flex; }
  .main { padding: 18px 14px 96px; }
  .search { max-width: none; }
  .top { gap: 8px; }
  .brand span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
}

@media (prefers-reduced-motion: reduce) {
  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-motion="reduce"] *, html[data-motion="reduce"] *::before, html[data-motion="reduce"] *::after {
  animation: none !important;
  transition: none !important;
}

html, body { max-width: 100%; overflow-x: clip; }
.lab-links, .uni-menu, .top, .app, .main, .search, .bottom-nav, .rail {
  max-width: 100%;
  min-width: 0;
}
.uni-menu, .lab-links { flex-wrap: wrap; }
.top { flex-wrap: wrap; }
.search { width: 100%; min-width: 0; }