:root {
  --bg: #0a0e17;
  --bg-2: #0f1523;
  --card: #131a2b;
  --card-2: #182136;
  --border: #263149;
  --text: #e7ecf5;
  --muted: #93a0bd;
  --accent: #38e1c6;
  --accent-2: #ffd23f;
  --omega: #38e1c6;
  --L: #ffd23f;
  --w1: #ff6b6b;
  --w2: #4dabf7;
  --w3: #b197fc;
  --stable: #37d67a;
  --unstable: #ff6b6b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, sans-serif;
  background: radial-gradient(1200px 700px at 70% -10%, #16233f 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: "JetBrains Mono", monospace; }

/* ---------- Hero ---------- */
.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.6rem 1.5rem 1rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(600px 300px at 20% 90%, rgba(56, 225, 198, 0.08), transparent),
    radial-gradient(500px 300px at 85% 20%, rgba(255, 210, 63, 0.07), transparent);
  pointer-events: none;
}
.hero-inner { max-width: 780px; position: relative; z-index: 1; }
.credit {
  position: absolute;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
@media (max-width: 640px) {
  .credit { position: static; transform: none; display: block; margin-top: 0.5rem; }
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.72rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 0.4rem;
}
.hero h1 {
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
  line-height: 1.1;
  white-space: nowrap;
  margin: 0;
  font-weight: 700;
  background: linear-gradient(120deg, #ffffff 20%, var(--accent) 60%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede { font-size: 1.05rem; color: var(--muted); margin: 0 auto; max-width: 720px; }
.lab-lede { margin-top: 1.4rem; text-align: center; }

/* ---------- Lab ---------- */
.lab { max-width: 1240px; margin: 0 auto; padding: 1rem 1.5rem 3rem; }
.lab-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 1.25rem;
  align-items: start;
  position: relative;
}
.lab-grid.panel-closed { grid-template-columns: 1fr; }
.lab-grid.panel-closed .panel { display: none; }
@media (max-width: 900px) {
  .lab-grid { grid-template-columns: 1fr; }
}

.viewport-card, .panel, .graph-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.viewport-card { overflow: hidden; }
#viewport {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 10;
  max-height: 44vh;
  background: linear-gradient(180deg, #0c1322, #0a0e17);
}
#viewport canvas { display: block; width: 100% !important; height: 100% !important; }
#loading {
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  color: var(--muted); font-size: 0.95rem;
}
.viewport-hud {
  position: absolute; top: 12px; left: 14px;
  display: flex; flex-direction: column; gap: 4px;
  font-size: 0.8rem; color: var(--muted);
  pointer-events: none;
}
.viewport-hud span { display: flex; align-items: center; gap: 7px; }

.dot { width: 11px; height: 11px; border-radius: 50%; display: inline-block; flex: none; }
.dot-omega { background: var(--omega); }
.dot-L { background: var(--L); }
.dot-w1 { background: var(--w1); }
.dot-w2 { background: var(--w2); }
.dot-w3 { background: var(--w3); }

.conserved-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border-top: 1px solid var(--border);
}
.conserved {
  padding: 0.85rem 1rem;
  border-right: 1px solid var(--border);
}
.conserved:last-child { border-right: none; }
.conserved label { display: block; font-size: 0.72rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.05em; }
.conserved output { font-family: "JetBrains Mono", monospace; font-size: 1.15rem; font-weight: 500; color: var(--text); }

/* ---------- Panel ---------- */
.panel { padding: 1.1rem 1.1rem 1.3rem; }
.panel-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 1rem; }
.panel-head h2 { margin: 0; font-size: 1.15rem; }
.control-block { margin-bottom: 1.4rem; }
.block-title { display: block; font-size: 0.82rem; color: var(--muted); margin-bottom: 0.6rem; font-weight: 600; }

/* icon + open/close buttons */
.icon-btn {
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--muted);
  width: 30px; height: 30px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
  line-height: 1;
  transition: all 0.15s ease;
}
.icon-btn:hover { color: var(--text); border-color: var(--accent); }

.panel-open {
  position: absolute;
  top: 12px; right: 12px;
  z-index: 5;
  font-family: inherit;
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.5rem 0.9rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: rgba(19, 26, 43, 0.9);
  backdrop-filter: blur(6px);
  color: var(--text);
  cursor: pointer;
  box-shadow: var(--shadow);
  transition: all 0.15s ease;
}
.panel-open:hover { border-color: var(--accent); color: var(--accent); }
.panel-open[hidden] { display: none; }

/* collapsible sections */
.section {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-2);
  margin-bottom: 0.7rem;
  overflow: hidden;
}
.section > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.7rem 0.9rem;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}
.section > summary::-webkit-details-marker { display: none; }
.section > summary::after {
  content: "";
  width: 8px; height: 8px;
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: rotate(-45deg);
  transition: transform 0.2s ease;
  margin-right: 2px;
}
.section[open] > summary::after { transform: rotate(45deg); }
.section > summary:hover { color: var(--accent); }
.section > summary:hover::after { border-color: var(--accent); }
.section-body { padding: 0 0.9rem 0.95rem; }

.axis-buttons { display: grid; gap: 0.5rem; }
.axis-buttons.two { grid-template-columns: 1fr 1fr; }
.custom-axis {
  margin-top: 0.7rem;
  padding: 0.85rem 0.9rem 0.6rem;
  border: 1px dashed var(--border);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.015);
}
.custom-axis[hidden] { display: none; }
.axis-buttons button {
  text-align: left;
  padding: 0.6rem 0.8rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--text);
  cursor: pointer;
  transition: all 0.15s ease;
  display: flex; flex-direction: column;
}
.axis-buttons button b { font-size: 0.92rem; }
.axis-buttons button small { color: var(--muted); font-size: 0.74rem; }
.axis-row { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.axis-status {
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.08rem 0.45rem;
  border-radius: 999px;
}
.axis-status.stable   { background: rgba(55, 214, 122, 0.16); color: var(--stable); }
.axis-status.unstable { background: rgba(255, 107, 107, 0.16); color: var(--unstable); }
.axis-status.marginal { background: rgba(255, 210, 63, 0.16); color: var(--accent-2); }
.axis-buttons button:hover { border-color: var(--accent); }
.axis-buttons button.active {
  border-color: var(--accent);
  background: linear-gradient(180deg, rgba(56, 225, 198, 0.14), rgba(56, 225, 198, 0.04));
  box-shadow: inset 0 0 0 1px rgba(56, 225, 198, 0.3);
}

.slider-label {
  display: flex; justify-content: space-between;
  font-size: 0.85rem; margin-bottom: 0.35rem; color: var(--text);
}
.slider-label span { color: var(--accent); font-family: "JetBrains Mono", monospace; }

input[type="range"] {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 5px; border-radius: 4px;
  background: var(--border); outline: none; margin: 0 0 0.4rem;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 17px; height: 17px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 3px solid var(--bg); box-shadow: 0 0 0 1px var(--accent);
}
input[type="range"]::-moz-range-thumb {
  width: 15px; height: 15px; border-radius: 50%;
  background: var(--accent); cursor: pointer; border: 3px solid var(--bg);
}

.hint { font-size: 0.76rem; color: var(--muted); margin: 0.4rem 0 0; line-height: 1.5; }
#orderHint { font-family: "JetBrains Mono", monospace; }

.button-row { display: flex; gap: 0.6rem; margin-bottom: 1rem; }
.button-row button, .axis-buttons button { font-family: inherit; }
.button-row button {
  flex: 1;
  padding: 0.65rem;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-2);
  color: var(--text);
  cursor: pointer;
  font-weight: 600;
  transition: all 0.15s ease;
}
.button-row button:hover { border-color: var(--accent); }
.button-row .primary { background: var(--accent); color: #04231e; border-color: var(--accent); }
.button-row .primary:hover { filter: brightness(1.08); }

.toggle { display: flex; align-items: center; gap: 0.55rem; font-size: 0.85rem; color: var(--muted); cursor: pointer; }
.toggle input { width: 16px; height: 16px; accent-color: var(--accent); }

/* ---------- Graph ---------- */
.graph-card { margin-top: 0.9rem; padding: 0.9rem 1.1rem 1rem; }
.graph-head { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.graph-head h3 { margin: 0; font-size: 1rem; }
.graph-controls { display: flex; align-items: center; gap: 1.1rem; flex-wrap: wrap; }
.legend { display: flex; gap: 1rem; font-size: 0.82rem; color: var(--muted); }
.legend span { display: flex; align-items: center; gap: 6px; }

.seg {
  display: inline-flex;
  background: var(--card-2);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 3px;
  gap: 3px;
}
.seg button {
  font-family: inherit;
  font-size: 0.8rem;
  padding: 0.32rem 0.7rem;
  border: none;
  background: transparent;
  color: var(--muted);
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.seg button:hover { color: var(--text); }
.seg button.active { background: var(--accent); color: #04231e; font-weight: 600; }
#graph { width: 100%; height: 20vh; min-height: 130px; max-height: 220px; margin-top: 0.6rem; display: block; }
.graph-caption { margin-top: 0.7rem; }
.graph-caption h3 { margin: 0 0 0.3rem; font-size: 1rem; }
.graph-caption .hint { margin-top: 0; }

/* ---------- Prose ---------- */
.prose { max-width: 820px; margin: 3rem auto 5rem; padding: 0 1.5rem; }
.prose section { margin-bottom: 3rem; }
.prose h2 {
  font-size: 1.7rem; margin: 0 0 1rem;
  border-left: 3px solid var(--accent); padding-left: 0.8rem;
}
.prose h3 { font-size: 1.15rem; margin: 1.8rem 0 0.6rem; color: var(--accent); }
.prose p, .prose li { color: #cdd6e8; }
.prose strong { color: #fff; }
.prose a { color: var(--accent); text-decoration: none; border-bottom: 1px solid rgba(56, 225, 198, 0.35); }
.prose a:hover { border-bottom-color: var(--accent); }
.prose ul, .prose ol { padding-left: 1.3rem; }
.prose li { margin-bottom: 0.4rem; }

.tag { font-size: 0.72rem; font-weight: 700; padding: 0.1rem 0.5rem; border-radius: 999px; text-transform: uppercase; letter-spacing: 0.04em; }
.tag.stable { background: rgba(55, 214, 122, 0.15); color: var(--stable); }
.tag.unstable { background: rgba(255, 107, 107, 0.15); color: var(--unstable); }

mjx-container { overflow-x: auto; overflow-y: hidden; max-width: 100%; }

.prose-footer { border-top: 1px solid var(--border); padding-top: 1.5rem; }
.prose-footer p { font-size: 0.88rem; color: var(--muted); }