:root {
  --bg: #0a0a0c;
  --bg-2: #131318;
  --bg-3: #1c1c24;
  --fg: #e8e6df;
  --fg-2: #a8a59c;
  --fg-3: #6b6960;
  --accent: #d4a574;
  --blue: #7fb3d5;
  --teal: #5fc9b3;
  --coral: #e8794a;
  --purple: #a78bfa;
  --border: rgba(255,255,255,0.07);
  --border-2: rgba(255,255,255,0.16);
  --serif: 'Cormorant Garamond', 'Georgia', serif;
  --sans: -apple-system, BlinkMacSystemFont, 'Inter', system-ui, sans-serif;
  --mono: 'JetBrains Mono', 'SF Mono', Menlo, Consolas, monospace;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 32px; }
.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 24px;
}
h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-bottom: 32px;
}
h1 em { font-style: italic; color: var(--accent); }
h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(32px, 4.5vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin-bottom: 24px;
}
.lede {
  font-size: clamp(17px, 1.6vw, 21px);
  color: var(--fg-2);
  max-width: 720px;
  margin-bottom: 40px;
  line-height: 1.55;
}
.section-intro {
  max-width: 760px;
  color: var(--fg-2);
  font-size: 17px;
  margin-bottom: 48px;
}
section { padding: 110px 0; border-bottom: 1px solid var(--border); }
.hero {
  min-height: 88vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 80px 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 70% 40%, rgba(212,165,116,0.06) 0%, transparent 60%);
  pointer-events: none;
}
.hero .wrap { position: relative; z-index: 2; }
.hero .instrument-tag {
  margin-top: 36px;
  font-family: var(--mono);
  font-size: 11px;
  color: var(--fg-3);
  letter-spacing: 0.05em;
  line-height: 1.9;
}

.ptable {
  display: grid;
  grid-template-columns: repeat(18, minmax(0, 1fr));
  grid-template-rows: repeat(7, minmax(0,1fr)) 18px repeat(2, minmax(0,1fr));
  gap: 3px;
  margin-bottom: 8px;
}
.cell {
  aspect-ratio: 1;
  background: var(--bg-2);
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  transition: transform 0.12s, border-color 0.12s, background 0.12s;
  font-family: var(--mono);
  position: relative;
  user-select: none;
}
.cell:hover {
  background: var(--bg-3);
  border-color: var(--accent);
  transform: scale(1.12);
  z-index: 5;
}
.cell.active {
  border-color: var(--accent);
  background: var(--bg-3);
  box-shadow: 0 0 0 1px var(--accent);
}
.cell .z {
  font-size: 8px;
  color: var(--fg-3);
  position: absolute;
  top: 3px;
  left: 4px;
  line-height: 1;
}
.cell .sym {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: -0.02em;
}
.cell.s-block .sym { color: var(--coral); }
.cell.p-block .sym { color: var(--blue); }
.cell.d-block .sym { color: var(--teal); }
.cell.f-block .sym { color: var(--purple); }
.legend {
  display: flex;
  gap: 28px;
  font-size: 11px;
  font-family: var(--mono);
  color: var(--fg-2);
  margin-top: 20px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.legend span::before { content: '■'; margin-right: 6px; font-size: 10px; }
.legend .s::before { color: var(--coral); }
.legend .p::before { color: var(--blue); }
.legend .d::before { color: var(--teal); }
.legend .f::before { color: var(--purple); }

.detail {
  background: var(--bg-2);
  border: 1px solid var(--border);
  padding: 36px;
  margin-top: 36px;
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: center;
}
.detail .sym-big {
  font-family: var(--serif);
  font-size: 110px;
  line-height: 0.95;
  color: var(--accent);
  font-weight: 400;
}
.detail .name { font-size: 22px; margin-top: 4px; letter-spacing: -0.01em; }
.detail .meta { color: var(--fg-2); font-family: var(--mono); font-size: 12px; margin-top: 4px; }
.detail .props {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px 24px;
}
.prop { border-left: 1px solid var(--border-2); padding-left: 14px; }
.prop label {
  display: block; font-size: 10px; color: var(--fg-3);
  font-family: var(--mono); text-transform: uppercase;
  letter-spacing: 0.1em; margin-bottom: 4px;
}
.prop .v { font-family: var(--mono); font-size: 15px; color: var(--fg); }
.prop .src {
  font-size: 9px; color: var(--fg-3); margin-top: 2px;
  letter-spacing: 0.05em; text-transform: uppercase;
}

#three-container {
  width: 100%; height: 620px;
  background: radial-gradient(ellipse at center, #14141c 0%, #07070a 100%);
  border: 1px solid var(--border);
  position: relative; overflow: hidden; cursor: grab;
}
#three-container:active { cursor: grabbing; }
.three-overlay {
  position: absolute; top: 18px; left: 18px;
  font-family: var(--mono); font-size: 11px; color: var(--fg-2);
  pointer-events: none; line-height: 1.7;
}
.three-overlay .key { color: var(--accent); display: inline-block; width: 14px; }
.three-controls {
  position: absolute; bottom: 18px; right: 18px; display: flex; gap: 6px;
}
.three-controls button {
  background: rgba(15,15,20,0.85); border: 1px solid var(--border-2);
  color: var(--fg); padding: 7px 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.05em;
  cursor: pointer; text-transform: uppercase;
  transition: border-color 0.15s, background 0.15s;
}
.three-controls button:hover {
  background: rgba(30,30,38,0.95); border-color: var(--accent); color: var(--accent);
}

.formula {
  background: var(--bg-2); padding: 28px 32px;
  border-left: 2px solid var(--accent);
  margin: 36px 0 16px;
  font-family: var(--mono); font-size: 15px; color: var(--fg-2);
  overflow-x: auto; letter-spacing: 0.01em;
}
.formula .term { color: var(--fg); }
.formula .shell-term { color: var(--accent); }
.formula .name-tag { color: var(--accent); }
.formula sub, .formula sup { font-size: 0.75em; }
.formula-note {
  font-family: var(--mono); font-size: 11px; color: var(--fg-3);
  margin-bottom: 40px; max-width: 780px; line-height: 1.75;
}

.predictor {
  display: grid; grid-template-columns: 1fr 1.2fr; gap: 32px; align-items: start;
}
.controls { background: var(--bg-2); border: 1px solid var(--border); padding: 32px; }
.control { margin-bottom: 28px; }
.control:last-child { margin-bottom: 0; }
.control label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 11px; color: var(--fg-2);
  margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.1em;
}
.control label .v { color: var(--accent); font-size: 18px; letter-spacing: 0; }
.control input[type=range], .z-control input[type=range] {
  width: 100%; -webkit-appearance: none; appearance: none;
  background: var(--bg-3); height: 2px; outline: none; cursor: pointer;
}
.control input[type=range]::-webkit-slider-thumb,
.z-control input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px;
  background: var(--accent); border-radius: 50%;
  cursor: pointer; border: 2px solid var(--bg);
}
.control input[type=range]::-moz-range-thumb,
.z-control input[type=range]::-moz-range-thumb {
  width: 14px; height: 14px;
  background: var(--accent); border-radius: 50%;
  cursor: pointer; border: 2px solid var(--bg);
}
.results {
  background: var(--bg-2); border: 1px solid var(--border); padding: 32px;
  font-family: var(--mono); font-size: 13px;
}
.results .row {
  display: flex; justify-content: space-between; align-items: baseline;
  padding: 9px 0; border-bottom: 1px solid var(--border);
}
.results .row:last-of-type { border: none; padding-bottom: 14px; }
.results .label {
  color: var(--fg-2); font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.06em;
}
.results .value { color: var(--fg); font-size: 14px; }
.results .row.shell .value { color: var(--accent); }
.results .row.measured .value { color: var(--teal); }
.verdict { margin-top: 14px; padding: 18px 20px; border: 1px solid var(--border-2); }
.verdict.bound { border-color: rgba(95,201,179,0.4); background: rgba(95,201,179,0.05); }
.verdict.unbound { border-color: rgba(232,121,74,0.4); background: rgba(232,121,74,0.05); }
.verdict h4 {
  font-family: var(--sans); font-size: 13px; margin-bottom: 8px;
  letter-spacing: 0.02em; text-transform: uppercase;
}
.verdict.bound h4 { color: var(--teal); }
.verdict.unbound h4 { color: var(--coral); }
.verdict p { font-size: 12px; color: var(--fg-2); line-height: 1.6; font-family: var(--sans); }

.dripwrap { position: relative; background: var(--bg-2); border: 1px solid var(--border); }
#driplines { width: 100%; height: 560px; display: block; }
.dripinfo {
  position: absolute; top: 16px; left: 16px;
  font-family: var(--mono); font-size: 11px; color: var(--fg-2);
  pointer-events: none;
}

/* section V and VI shared panel style */
.electronic, .charge-layout {
  display: grid; grid-template-columns: 340px 1fr; gap: 32px; align-items: start;
}
.panel {
  background: var(--bg-2); border: 1px solid var(--border); padding: 32px;
}
.panel .big-sym {
  font-family: var(--serif); font-size: 120px; line-height: 0.88;
  color: var(--accent); font-weight: 400; letter-spacing: -0.02em;
}
.panel .big-sym sup {
  font-size: 40px; color: var(--coral); font-family: var(--mono);
  font-weight: 400; vertical-align: super; letter-spacing: 0;
}
.panel .big-name { font-size: 22px; margin-top: 6px; letter-spacing: -0.01em; }
.panel .config-text {
  font-family: var(--mono); font-size: 13px; color: var(--fg-2);
  margin-top: 10px; word-break: break-word; line-height: 1.6;
}
.panel .block-label {
  font-family: var(--mono); font-size: 10px;
  text-transform: uppercase; letter-spacing: 0.12em; color: var(--accent);
  margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border);
}
.z-control { margin-top: 24px; }
.z-control label {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 11px; color: var(--fg-2);
  margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.1em;
}
.z-control label .v { color: var(--accent); font-size: 18px; }
.rel-container { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--border); }
.rel-label {
  font-family: var(--mono); font-size: 10px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 10px;
}
.rel-bar {
  position: relative; height: 10px;
  background: linear-gradient(to right, #1e3a2a 0%, #3a5025 32%, #8a6520 68%, #9a2f1a 100%);
  border: 1px solid var(--border-2);
}
.rel-marker {
  position: absolute; top: -4px; width: 2px; height: 18px;
  background: var(--accent); transition: left 0.1s;
}
.rel-regions {
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 9px; color: var(--fg-3);
  margin-top: 8px; text-transform: uppercase; letter-spacing: 0.05em;
}
.rel-readout {
  font-family: var(--mono); font-size: 11px; color: var(--fg-2); margin-top: 12px;
}
.rel-readout .v { color: var(--accent); }

.orbital-grid-wrap {
  background: var(--bg-2); border: 1px solid var(--border); padding: 28px;
}
.orbital-grid {
  display: grid; grid-template-columns: repeat(6, 1fr);
  grid-auto-rows: minmax(68px, 1fr); gap: 8px;
}
.orbital-grid-header {
  display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px;
  margin-bottom: 8px; font-family: var(--mono); font-size: 10px;
  color: var(--fg-3); text-transform: uppercase; letter-spacing: 0.1em; text-align: center;
}
.orbital {
  background: var(--bg-3); border: 1px solid var(--border); padding: 10px 12px;
  position: relative; font-family: var(--mono);
  display: flex; flex-direction: column; justify-content: space-between;
  overflow: hidden; transition: border-color 0.15s, background 0.15s;
}
.orbital .olabel { font-size: 17px; font-weight: 500; color: var(--fg); line-height: 1; }
.orbital .ocount { font-size: 10px; color: var(--fg-3); margin-top: 4px; }
.orbital .ofill {
  position: absolute; bottom: 0; left: 0; height: 3px;
  background: var(--fg-3); transition: width 0.25s, background 0.15s;
}
.orbital.s-block.partial .ofill, .orbital.s-block.full .ofill { background: var(--coral); }
.orbital.p-block.partial .ofill, .orbital.p-block.full .ofill { background: var(--blue); }
.orbital.d-block.partial .ofill, .orbital.d-block.full .ofill { background: var(--teal); }
.orbital.f-block.partial .ofill, .orbital.f-block.full .ofill { background: var(--purple); }
.orbital.g-block.partial .ofill, .orbital.g-block.full .ofill { background: var(--accent); }
.orbital.empty .olabel { color: var(--fg-3); }
.orbital.empty .ocount { opacity: 0.5; }
.orbital.empty { opacity: 0.55; }
.orbital.current { border-color: var(--accent); background: rgba(212,165,116,0.08); }
.orbital.current .olabel { color: var(--accent); }
.econ-note {
  font-family: var(--mono); font-size: 11px; color: var(--fg-3);
  margin-top: 18px; line-height: 1.7; max-width: 760px;
}

/* Section VI charge state */
.charge-readouts { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--border); }
.charge-readouts .ro {
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); padding: 6px 0;
}
.charge-readouts .ro label {
  font-size: 10px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.08em;
}
.charge-readouts .ro .v { font-size: 14px; color: var(--fg); }
.charge-readouts .ro.kalpha .v { color: var(--accent); }

.orbital-bars-wrap {
  background: var(--bg-2); border: 1px solid var(--border); padding: 32px;
}
.orbital-bars-wrap h4 {
  font-family: var(--mono); font-size: 10px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 20px;
}
.orbital-bars {
  display: flex; flex-direction: column; gap: 6px;
  font-family: var(--mono);
}
.ob-row {
  display: grid; grid-template-columns: 44px 1fr 100px;
  align-items: center; gap: 14px; font-size: 12px;
}
.ob-label { color: var(--fg); font-weight: 500; font-size: 13px; }
.ob-track {
  position: relative; height: 18px; background: var(--bg-3);
  border-left: 1px solid var(--border);
}
.ob-bar {
  height: 100%; min-width: 2px;
  transition: width 0.3s ease-out, background 0.2s;
}
.ob-row.s-block .ob-bar { background: var(--coral); }
.ob-row.p-block .ob-bar { background: var(--blue); }
.ob-row.d-block .ob-bar { background: var(--teal); }
.ob-row.f-block .ob-bar { background: var(--purple); }
.ob-row.g-block .ob-bar { background: var(--accent); }
.ob-value { color: var(--fg-2); text-align: right; font-size: 11px; }

.scale-ticks {
  display: grid; grid-template-columns: 44px 1fr 100px; gap: 14px;
  font-family: var(--mono); font-size: 9px; color: var(--fg-3);
  margin-top: 12px; text-transform: uppercase; letter-spacing: 0.05em;
}
.scale-ticks .tick-track {
  display: flex; justify-content: space-between;
  border-top: 1px solid var(--border); padding-top: 4px;
}

/* Section VII · deformation */
.deformation-layout {
  display: grid; grid-template-columns: 340px 1fr; gap: 32px; align-items: start;
}
.fission-wrap, .betamap-wrap {
  background: var(--bg-2); border: 1px solid var(--border); padding: 28px;
}
.plot-title {
  font-family: var(--mono); font-size: 10px; color: var(--fg-3);
  text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 18px; font-weight: 400;
}
#fissioncurve { width: 100%; height: 260px; display: block; }
#betamap { width: 100%; height: 340px; display: block; }
@media (max-width: 900px) {
  .deformation-layout { grid-template-columns: 1fr; }
}

footer {
  padding: 80px 0 100px; text-align: center; color: var(--fg-3);
  font-family: var(--mono); font-size: 11px; line-height: 1.9; letter-spacing: 0.05em;
}

@media (max-width: 900px) {
  .wrap { padding: 0 20px; }
  .predictor { grid-template-columns: 1fr; }
  .electronic, .charge-layout { grid-template-columns: 1fr; }
  .detail { grid-template-columns: 1fr; gap: 24px; padding: 24px; }
  .detail .sym-big { font-size: 80px; }
  .detail .props { grid-template-columns: 1fr 1fr; }
  .ptable { gap: 1px; }
  .cell .sym { font-size: 8px; }
  .cell .z { font-size: 5px; }
  section { padding: 70px 0; }
  #three-container { height: 480px; }
  .orbital .olabel { font-size: 14px; }
  .orbital .ocount { font-size: 9px; }
  .ob-row { grid-template-columns: 36px 1fr 78px; gap: 10px; }
}

/* ─── Astro / Layout reset for the instrument ─────────────── */
/* Keep instrument self-styled but yield body height to Layout flex */
.tensor-instrument-root { display: block; }
.tensor-instrument-root section { padding: 110px 0; border-bottom: 1px solid var(--border); }
.tensor-instrument-root .hero { min-height: 88vh; }