@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Noto+Sans+SC:wght@400;500;600&family=Noto+Serif+SC:wght@500;600&display=swap");

:root {
  --bg: #06100c;
  --panel: #0a1712;
  --panel-strong: #0e2018;
  --line: rgba(190, 221, 204, 0.16);
  --ink: #edf5e9;
  --muted: #93a69b;
  --acid: #b8ff3d;
  --mint: #62deb4;
  --cyan: #67d5f3;
  --warm: #ffbd6b;
  --danger: #ff776f;
  --mono: "IBM Plex Mono", Consolas, monospace;
  --serif: "Noto Serif SC", serif;
  --sans: "Noto Sans SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(136, 173, 151, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(136, 173, 151, .025) 1px, transparent 1px),
    radial-gradient(circle at 76% 15%, rgba(103, 213, 243, .08), transparent 28rem),
    var(--bg);
  background-size: 100% 44px, 44px 100%, auto, auto;
  font-family: var(--sans);
}

button, a { font: inherit; }
a { color: inherit; text-decoration: none; }

.site-header {
  min-height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 clamp(22px, 5vw, 72px);
  border-bottom: 1px solid var(--line);
  background: rgba(4, 12, 9, .86);
  backdrop-filter: blur(18px);
}

.brand, .site-header nav { display: flex; align-items: center; gap: 22px; }
.brand { gap: 12px; font: 600 12px var(--mono); letter-spacing: .12em; }
.brand-mark {
  width: 29px; height: 29px; display: grid; place-items: center;
  border: 1px solid var(--acid); border-radius: 50%; color: var(--acid);
}
.site-header nav a { color: var(--muted); font-size: 13px; }
.site-header nav a:hover { color: var(--acid); }

main { width: min(1500px, calc(100% - 40px)); margin: 0 auto; }

.hero {
  min-height: 310px;
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  align-items: end;
  gap: 60px;
  padding: 70px 0 48px;
}

.eyebrow, .panel-label, .section-kicker {
  color: var(--acid);
  font: 600 10px var(--mono);
  letter-spacing: .13em;
}

.hero h1 {
  margin: 16px 0 0;
  font: 500 clamp(42px, 6vw, 82px)/1.15 var(--serif);
  letter-spacing: -.045em;
}
.hero h1 em, .principle h2 em { color: var(--acid); font-style: normal; }
.hero p { margin: 0 0 12px; color: var(--muted); font-size: 16px; line-height: 1.9; }

.lab {
  overflow: hidden;
  border: 1px solid rgba(184, 255, 61, .28);
  border-radius: 12px;
  background: rgba(5, 14, 10, .92);
  box-shadow: 0 34px 100px rgba(0, 0, 0, .32);
}

.scenario-tabs { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.scenario-tab {
  min-height: 78px;
  padding: 15px 20px;
  border: 0;
  border-right: 1px solid var(--line);
  color: var(--muted);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.scenario-tab:last-child { border-right: 0; }
.scenario-tab small { display: block; margin-bottom: 8px; color: var(--mint); font: 600 9px var(--mono); }
.scenario-tab span { font-size: 15px; }
.scenario-tab:hover { background: rgba(98, 222, 180, .05); color: var(--ink); }
.scenario-tab.is-active {
  color: var(--ink);
  background: linear-gradient(135deg, rgba(184, 255, 61, .13), rgba(98, 222, 180, .03));
  box-shadow: inset 0 -2px var(--acid);
}

.lab-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  padding: 19px 24px;
  border-bottom: 1px solid var(--line);
}
.lab-head h2 { margin: 5px 0 0; font: 500 22px var(--serif); }
.step-readout { display: flex; align-items: baseline; gap: 14px; font-family: var(--mono); }
.step-readout span { color: var(--acid); font-size: 11px; }
.step-readout strong { color: var(--muted); font-size: 13px; }

.case-tabs {
  display: flex;
  gap: 7px;
  padding: 11px 20px;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .012);
}
.case-tab {
  flex: 0 0 auto;
  min-height: 30px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  font: 9px var(--mono);
  cursor: pointer;
}
.case-tab:hover { color: var(--ink); border-color: rgba(98, 222, 180, .4); }
.case-tab.is-active { color: #06100c; border-color: var(--mint); background: var(--mint); }

.principle-lenses {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(98, 222, 180, .025), rgba(184, 255, 61, .035));
}
.principle-lenses article { min-width: 0; padding: 15px 20px 17px; border-right: 1px solid var(--line); }
.principle-lenses article:last-child { border-right: 0; }
.principle-lenses span { color: var(--mint); font: 600 8px var(--mono); letter-spacing: .1em; }
.principle-lenses p { margin: 8px 0 0; color: #b9cbc0; font-size: 12px; line-height: 1.65; }

.lab-grid { display: grid; grid-template-columns: 300px minmax(0, 1fr) 300px; min-height: 570px; }
.explain-panel, .visual-panel, .inspect-panel { min-width: 0; padding: 28px; }
.explain-panel, .visual-panel { border-right: 1px solid var(--line); }
.explain-panel { display: flex; flex-direction: column; }
.phase { color: var(--mint); font: 600 10px var(--mono); letter-spacing: .1em; }
.explain-panel h2 { margin: 16px 0; font: 500 clamp(28px, 3vw, 42px)/1.25 var(--serif); }
.explain-panel > p { margin: 0; color: #cad9d0; font-size: 15px; line-height: 1.85; }
.why-box { margin-top: 26px; padding: 16px; border-left: 2px solid var(--acid); background: rgba(184, 255, 61, .055); }
.why-box span { color: var(--acid); font: 600 9px var(--mono); }
.why-box p { margin: 8px 0 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
.article-link { margin-top: auto; padding-top: 28px; color: var(--mint); font: 500 11px var(--mono); }

.visual-panel { background: radial-gradient(circle at 50% 32%, rgba(98, 222, 180, .08), transparent 22rem); }
.visual-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 20px; }
.visual-head h2 { margin: 7px 0 0; font: 500 24px var(--serif); }
.visual-status { color: var(--acid); font: 500 18px var(--mono); letter-spacing: .08em; }
.visual-stage { min-height: 430px; display: grid; place-items: center; padding: 34px 0 10px; }

.bit-register { width: min(600px, 100%); }
.bit-row { display: grid; grid-template-columns: repeat(6, 1fr); gap: 8px; }
.bit {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  position: relative;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, .02);
  color: #61766a;
  font: 500 clamp(20px, 4vw, 38px) var(--mono);
  transition: 400ms ease;
}
.bit small { position: absolute; bottom: -24px; color: var(--muted); font-size: 8px; }
.bit.is-on { border-color: rgba(184, 255, 61, .64); background: rgba(184, 255, 61, .14); color: var(--acid); box-shadow: 0 0 30px rgba(184, 255, 61, .08); }
.bit.is-focus { outline: 1px solid var(--cyan); outline-offset: 4px; }
.flag-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 58px; }
.flag-tag { padding: 8px 10px; border: 1px solid var(--line); border-radius: 999px; color: var(--muted); font: 10px var(--mono); }
.flag-tag.is-on { border-color: rgba(184, 255, 61, .4); color: var(--acid); }
.inline-sandbox {
  margin-top: 18px; padding: 13px; border: 1px solid rgba(98, 222, 180, .22);
  background: rgba(98, 222, 180, .035);
}
.sandbox-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.sandbox-head span { color: var(--mint); font: 600 8px var(--mono); letter-spacing: .08em; }
.sandbox-head strong { color: var(--acid); font: 10px var(--mono); }
.sandbox-actions, .flag-switches { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 11px; }
.sandbox-actions button, .flag-switches button {
  min-height: 29px; padding: 0 9px; border: 1px solid var(--line); border-radius: 4px;
  color: var(--muted); background: rgba(255, 255, 255, .02); font: 8px var(--mono); cursor: pointer;
}
.sandbox-actions button:hover, .flag-switches button:hover { border-color: var(--mint); color: var(--ink); }
.sandbox-actions button:disabled { opacity: .4; cursor: not-allowed; }
.flag-switches button.is-active { border-color: var(--acid); color: #06100c; background: var(--acid); }
.sandbox-message { margin: 10px 0 0; color: var(--muted); font: 9px/1.6 var(--mono); }
.sandbox-message.is-warning { color: var(--danger); }
.sandbox-message.is-hit { color: var(--acid); }
.tree-sandbox { display: grid; gap: 9px; }
.tree-live { display: grid; gap: 6px; }
.tree-live .tree-node-box { padding: 9px; }

.bit-equation {
  margin-top: 20px; padding: 16px; border: 1px solid rgba(103, 213, 243, .28);
  color: var(--cyan); background: rgba(103, 213, 243, .045); font: 11px/1.7 var(--mono); text-align: center;
}

.random-map { width: min(660px, 100%); display: grid; gap: 20px; }
.method-strip { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.method-chip { padding: 9px 4px; border: 1px solid var(--line); color: #71857a; font: 8px var(--mono); text-align: center; }
.method-chip.is-active { border-color: var(--cyan); color: var(--cyan); background: rgba(103, 213, 243, .08); }
.weight-bar { position: relative; display: grid; grid-template-columns: 10fr 30fr 60fr; height: 82px; overflow: visible; border: 1px solid var(--line); border-radius: 8px; }
.weight-bar div { display: grid; place-items: center; border-right: 1px solid rgba(6, 16, 12, .5); font: 600 10px var(--mono); }
.weight-bar div:nth-child(1) { background: rgba(255, 189, 107, .55); }
.weight-bar div:nth-child(2) { background: rgba(103, 213, 243, .45); }
.weight-bar div:nth-child(3) { background: rgba(98, 222, 180, .45); }
.roll-lab { display: grid; gap: 8px; padding-top: 3px; }
.roll-input-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.roll-label { color: var(--muted); font: 9px var(--mono); }
.roll-input {
  width: 116px; min-height: 34px; padding: 0 10px; border: 1px solid rgba(103, 213, 243, .42);
  border-radius: 5px; outline: 0; color: var(--ink); background: #07110d; font: 11px var(--mono);
}
.roll-input:focus { border-color: var(--acid); box-shadow: 0 0 0 2px rgba(184, 255, 61, .1); }
.roll-axis { position: relative; height: 13px; color: var(--muted); font: 8px var(--mono); }
.roll-axis span { position: absolute; transform: translateX(-50%); }
.roll-axis span:nth-child(1) { left: 0; transform: none; }
.roll-axis span:nth-child(2) { left: 10%; }
.roll-axis span:nth-child(3) { left: 40%; }
.roll-axis span:nth-child(4) { right: 0; transform: none; }
.roll-marker {
  position: absolute; z-index: 2; top: -9px; bottom: -9px; width: 2px; opacity: 0;
  background: #fff; box-shadow: 0 0 0 3px rgba(6, 16, 12, .7), 0 0 14px var(--acid);
  transform: translateX(-1px); transition: left 260ms ease, opacity 160ms ease;
}
.roll-marker::before { content: ""; position: absolute; top: -4px; left: -4px; border: 5px solid transparent; border-top-color: #fff; }
.roll-marker.is-visible { opacity: 1; }
.roll-result { min-height: 23px; color: var(--muted); font: 10px/1.6 var(--mono); }
.roll-result.is-hit { color: var(--acid); }
.roll-result.is-error { color: var(--danger); }
.random-note { min-height: 96px; display: grid; place-items: center; padding: 20px; border: 1px dashed var(--line); color: #d6e3dc; text-align: center; line-height: 1.8; }
.bag-row { display: grid; grid-template-columns: repeat(10, 1fr); gap: 5px; }
.bag-item { min-height: 48px; display: grid; place-items: center; border: 1px solid var(--line); color: var(--muted); font: 9px var(--mono); }
.bag-item.rare { color: var(--cyan); }
.bag-item.epic { color: var(--warm); }
.pity-track { display: grid; grid-template-columns: repeat(6, 1fr); gap: 6px; }
.pity-step { min-height: 58px; display: grid; place-items: center; border: 1px solid var(--line); color: var(--muted); font: 9px var(--mono); }
.pity-step.is-active { border-color: var(--acid); color: var(--acid); background: rgba(184, 255, 61, .09); }
.seed-panel { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 12px; }
.seed-box { padding: 18px; border: 1px solid var(--line); color: var(--cyan); font: 10px/1.8 var(--mono); white-space: pre-line; }
.seed-arrow { color: var(--acid); font: 18px var(--mono); }

.space-stack { width: min(620px, 100%); display: grid; gap: 18px; }
.space-stack > .space-map, .space-stack > .tree-map, .space-stack > .candidate-list { width: 100%; }
.space-contract { display: grid; grid-template-columns: repeat(2, 1fr); border: 1px solid var(--line); }
.space-contract span { padding: 11px 13px; color: var(--muted); font: 9px var(--mono); }
.space-contract span:first-child { border-right: 1px solid var(--line); color: var(--cyan); }
.space-map { width: min(620px, 100%); }
.space-grid { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.space-cell {
  aspect-ratio: 1.2;
  display: grid;
  place-items: center;
  position: relative;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: #5f7468;
  transition: 400ms ease;
}
.space-cell:nth-child(4n) { border-right: 0; }
.space-cell:nth-last-child(-n + 4) { border-bottom: 0; }
.space-cell.is-interactive {
  padding: 0; appearance: none; cursor: pointer; font-family: var(--mono);
}
.space-cell.is-interactive:hover { background: rgba(103, 213, 243, .11); color: var(--cyan); }
.space-cell.is-previous { background: rgba(255, 119, 111, .08); box-shadow: inset 0 0 0 1px var(--danger); }
.space-cell.is-current { background: rgba(184, 255, 61, .09); box-shadow: inset 0 0 0 2px var(--acid); }
.space-cell.is-interactive:focus-visible { z-index: 2; outline: 2px solid var(--acid); outline-offset: -3px; }
.cell-coordinate { position: absolute; top: 7px; left: 8px; color: #65796e; font: 8px var(--mono); }
.interactive-grid { display: grid; gap: 14px; }
.grid-prompt { display: grid; grid-template-columns: 1fr auto; align-items: baseline; gap: 7px 18px; }
.grid-prompt span { color: var(--mint); font: 600 8px var(--mono); letter-spacing: .08em; }
.grid-prompt strong { color: var(--acid); font: 10px var(--mono); }
.grid-prompt em { grid-column: 1 / -1; color: var(--muted); font: normal 10px/1.5 var(--mono); }
.grid-comparison { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
.grid-comparison div { min-width: 0; padding: 11px 12px; border-right: 1px solid var(--line); }
.grid-comparison div:last-child { border-right: 0; }
.grid-comparison span { display: block; color: var(--muted); font: 8px var(--mono); }
.grid-comparison strong { display: block; margin-top: 7px; color: var(--acid); font: 13px var(--mono); }
.space-cell.is-scan { background: rgba(103, 213, 243, .06); }
.space-cell.is-near { background: rgba(184, 255, 61, .09); }
.space-cell.is-candidate { box-shadow: inset 0 0 0 2px var(--warm); }
.unit {
  width: 36px; height: 36px; display: grid; place-items: center;
  border-radius: 50%; color: #06100c; font: 700 10px var(--mono);
}
.unit.player { background: var(--acid); }
.unit.enemy { background: var(--warm); }
.space-formula { margin-top: 20px; padding: 14px; border-left: 2px solid var(--cyan); background: rgba(103, 213, 243, .06); color: var(--cyan); font: 11px var(--mono); }
.tree-map { width: min(620px, 100%); display: grid; gap: 18px; }
.tree-node-box { padding: 18px; border: 1px solid var(--line); color: var(--muted); font: 10px var(--mono); text-align: center; }
.tree-node-box.is-active { border-color: var(--acid); color: var(--acid); background: rgba(184, 255, 61, .07); }
.tree-children { display: grid; grid-template-columns: repeat(4, 1fr); gap: 7px; }
.candidate-list { width: min(580px, 100%); display: grid; gap: 8px; }
.candidate { display: flex; justify-content: space-between; padding: 14px; border: 1px solid var(--line); color: var(--muted); font: 10px var(--mono); }
.candidate.is-candidate { border-color: var(--warm); color: var(--warm); }
.candidate.is-hit { border-color: var(--acid); color: var(--acid); background: rgba(184, 255, 61, .06); }
.candidate.is-reject { opacity: .48; text-decoration: line-through; }

.inspect-panel { display: flex; flex-direction: column; gap: 26px; }
.metrics { display: grid; gap: 8px; margin: 14px 0 0; }
.metrics div { display: flex; justify-content: space-between; gap: 18px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.metrics dt { color: var(--muted); font: 9px var(--mono); text-transform: uppercase; }
.metrics dd { margin: 0; color: var(--acid); font: 500 11px var(--mono); text-align: right; }
.code-block { margin-top: auto; border: 1px solid var(--line); background: #050c09; }
.code-head { display: flex; justify-content: space-between; padding: 11px 13px; border-bottom: 1px solid var(--line); color: var(--muted); font: 8px var(--mono); }
.code-head strong { color: var(--acid); }
.code-block ol { margin: 0; padding: 8px 0; list-style: none; counter-reset: line; }
.code-block li { min-height: 29px; padding: 7px 12px 7px 38px; position: relative; color: #75887d; font: 10px/1.5 var(--mono); white-space: pre-wrap; }
.code-block li::before { counter-increment: line; content: counter(line); position: absolute; left: 14px; color: #405147; }
.code-block li.is-active { color: var(--ink); background: rgba(184, 255, 61, .07); box-shadow: inset 2px 0 var(--acid); }

.controls { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 15px 20px; border-top: 1px solid var(--line); }
.step-dots { display: flex; gap: 6px; }
.step-dot { width: 22px; height: 3px; border: 0; background: rgba(190, 221, 204, .18); }
.step-dot.is-past { background: var(--mint); }
.step-dot.is-active { background: var(--acid); }
.control-buttons { display: flex; gap: 8px; }
.control-buttons button {
  min-height: 38px; padding: 0 14px; border: 1px solid var(--line); border-radius: 5px;
  color: #cbd9d1; background: rgba(255, 255, 255, .02); font: 10px var(--mono); cursor: pointer;
}
.control-buttons button:hover { border-color: rgba(184, 255, 61, .5); color: var(--acid); }
.control-buttons .next-button { border-color: var(--acid); color: #06100c; background: var(--acid); }
.control-buttons .auto-button[aria-pressed="true"] { color: var(--acid); }

.principle { padding: 100px 0 120px; }
.principle h2 { margin: 18px 0 46px; font: 500 clamp(38px, 5vw, 68px)/1.25 var(--serif); }
.principle-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.principle-grid div { padding: 26px 28px 0 0; }
.principle-grid span { color: var(--acid); font: 10px var(--mono); }
.principle-grid h3 { margin: 22px 0 10px; font: 500 21px var(--serif); }
.principle-grid p { margin: 0; color: var(--muted); line-height: 1.75; }

@media (max-width: 1100px) {
  .lab-grid { grid-template-columns: 290px minmax(0, 1fr); }
  .inspect-panel { grid-column: 1 / -1; display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--line); }
  .visual-panel { border-right: 0; }
}

@media (max-width: 760px) {
  main { width: min(100% - 24px, 1500px); }
  .site-header { padding: 12px 18px; }
  .site-header nav a:not(:first-child) { display: none; }
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 26px; padding: 54px 0 34px; }
  .hero h1 { font-size: 42px; }
  .scenario-tabs { grid-template-columns: 1fr; }
  .scenario-tab { min-height: 58px; border-right: 0; border-bottom: 1px solid var(--line); }
  .scenario-tab:last-child { border-bottom: 0; }
  .principle-lenses { grid-template-columns: 1fr; }
  .principle-lenses article { border-right: 0; border-bottom: 1px solid var(--line); }
  .principle-lenses article:last-child { border-bottom: 0; }
  .lab-grid { grid-template-columns: 1fr; }
  .explain-panel, .visual-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .visual-stage { min-height: 360px; }
  .inspect-panel { grid-column: auto; grid-template-columns: 1fr; }
  .controls { align-items: stretch; flex-direction: column; }
  .control-buttons { display: grid; grid-template-columns: 1fr 1fr; }
  .principle-grid { grid-template-columns: 1fr; }
  .method-strip { grid-template-columns: repeat(3, 1fr); }
  .grid-prompt { grid-template-columns: 1fr; }
  .grid-prompt em { grid-column: auto; }
  .grid-comparison { grid-template-columns: repeat(2, 1fr); }
  .grid-comparison div:nth-child(2) { border-right: 0; }
  .grid-comparison div:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition-duration: .01ms !important; }
}

/* SPATIAL_HASH_BUCKET_EXPLAINER */
.hash-sandbox { gap: 18px; }
.hash-flow {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border: 1px solid var(--line);
}
.hash-flow-step {
  min-width: 0;
  padding: 11px 12px;
  border-right: 1px solid var(--line);
  background: rgba(255, 255, 255, .015);
}
.hash-flow-step:nth-child(2n) { border-right: 0; }
.hash-flow-step:nth-child(-n + 2) { border-bottom: 1px solid var(--line); }
.hash-flow-step span,
.hash-key-trace span,
.hash-bucket span {
  display: block;
  color: var(--muted);
  font: 10px var(--mono);
}
.hash-flow-step strong {
  display: block;
  margin-top: 7px;
  color: #71877b;
  font: 11px/1.5 var(--mono);
}
.hash-flow-step.is-active {
  background: rgba(103, 213, 243, .07);
  box-shadow: inset 0 -2px var(--cyan);
}
.hash-flow-step.is-active span { color: var(--cyan); }
.hash-flow-step.is-active strong { color: var(--ink); }
.hash-sandbox .cell-coordinate { color: #587064; font-size: 9px; }
.hash-key-trace {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--line);
}
.hash-key-trace > div {
  padding: 11px 12px;
  border-right: 1px solid var(--line);
}
.hash-key-trace > div:last-child { border-right: 0; }
.hash-key-trace strong {
  display: block;
  margin-top: 7px;
  color: var(--acid);
  font: 13px var(--mono);
}
.hash-key-trace small {
  display: block;
  margin-top: 7px;
  color: var(--muted);
  font: 10px var(--mono);
}
.hash-buckets {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: stretch;
  gap: 14px;
}
.hash-bucket {
  padding: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, .02);
}
.hash-bucket.is-current {
  border-color: rgba(184, 255, 61, .35);
  background: rgba(184, 255, 61, .05);
}
.hash-bucket strong {
  display: block;
  margin: 7px 0;
  color: var(--cyan);
  font: 10px var(--mono);
}
.hash-bucket code {
  display: block;
  color: var(--acid);
  font: 700 13px var(--mono);
}
.hash-transfer {
  min-width: 112px;
  display: grid;
  place-content: center;
  text-align: center;
}
.hash-transfer strong {
  color: var(--warm);
  font: 11px var(--mono);
}
.hash-transfer span {
  margin-top: 7px;
  color: var(--muted);
  font: 10px var(--mono);
}
.hash-transfer.is-skip strong { color: var(--mint); }
.hash-sparse-note {
  margin: 0;
  padding: 11px 12px;
  border-left: 2px solid var(--mint);
  color: var(--muted);
  background: rgba(102, 221, 180, .05);
  font: 10px/1.6 var(--mono);
}

/* SPATIAL_HASH_BUCKET_MOBILE */
@media (max-width: 760px) {
  .hash-flow { grid-template-columns: 1fr; }
  .hash-flow-step:nth-child(n) { border-right: 0; }
  .hash-flow-step:nth-child(-n + 3) { border-bottom: 1px solid var(--line); }
  .hash-buckets { grid-template-columns: 1fr; }
  .hash-transfer { min-height: 60px; }
}
/* CLEAN_NEUTRAL_SYSTEMS_PALETTE */
:root {
  --bg: #07090d;
  --panel: #0c1118;
  --panel-strong: #111925;
  --line: rgba(164, 181, 202, .17);
  --ink: #f4f7fb;
  --muted: #9aa8b7;
  --acid: #baf24a;
  --mint: #55e0be;
  --cyan: #55d6ff;
  --warm: #ffb45c;
  --danger: #ff707b;
}
body {
  background:
    linear-gradient(rgba(120, 150, 184, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 150, 184, .025) 1px, transparent 1px),
    radial-gradient(circle at 76% 15%, rgba(85, 214, 255, .07), transparent 28rem),
    var(--bg);
}
.site-header { background: rgba(7, 9, 13, .9); }
.lab {
  border-color: rgba(85, 214, 255, .2);
  background: rgba(9, 13, 19, .96);
  box-shadow: 0 34px 100px rgba(0, 0, 0, .42);
}
.scenario-tab:hover { background: rgba(85, 214, 255, .045); }
.scenario-tab.is-active {
  background: linear-gradient(135deg, rgba(85, 214, 255, .1), rgba(85, 224, 190, .025));
}
.case-tabs { background: rgba(255, 255, 255, .01); }
.case-tab.is-active,
.flag-switches button.is-active,
.control-buttons .next-button { color: var(--bg); }
.principle-lenses {
  background: linear-gradient(90deg, rgba(85, 214, 255, .025), rgba(85, 224, 190, .018));
}
.principle-lenses p { color: #cbd5e1; }
.explain-panel > p { color: #d5dde7; }
.why-box { background: rgba(186, 242, 74, .04); }
.visual-panel {
  background: radial-gradient(circle at 50% 32%, rgba(85, 214, 255, .065), transparent 22rem);
}
.bit,
.sandbox-actions button,
.flag-switches button,
.control-buttons button,
.hash-flow-step,
.hash-bucket { background: rgba(255, 255, 255, .018); }
.bit,
.method-chip,
.space-cell,
.code-block li { color: #718096; }
.inline-sandbox { border-color: rgba(85, 214, 255, .2); background: rgba(85, 214, 255, .025); }
.roll-input { background: #090d13; }
.random-note { color: #d8e0ea; }
.space-cell {
  background: #0e151e;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, .012);
}
.space-cell.is-interactive:hover { background: #122230; }
.space-cell.is-previous { background: rgba(255, 112, 123, .07); }
.space-cell.is-current { background: rgba(186, 242, 74, .075); }
.cell-coordinate,
.hash-sandbox .cell-coordinate { color: #77879a; }
.code-block { background: #080b10; }
.code-block li::before { color: #465363; }
.code-block li.is-active { background: rgba(85, 214, 255, .055); box-shadow: inset 2px 0 var(--cyan); }
.hash-flow-step.is-active { background: rgba(85, 214, 255, .065); }
.hash-bucket.is-current { border-color: rgba(186, 242, 74, .32); background: rgba(186, 242, 74, .045); }
.hash-sparse-note { background: rgba(85, 224, 190, .035); }

/* READABLE_SYSTEMS_TYPOGRAPHY */
body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
.eyebrow,
.panel-label,
.section-kicker { font-size: 11px; }
.scenario-tab small { font-size: 10px; }
.scenario-tab span { font-size: 16px; }
.lab-head h2 { font-size: 24px; }
.step-readout span { font-size: 12px; }
.step-readout strong { font-size: 14px; }
.case-tab {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 500;
  line-height: 1.25;
}
.principle-lenses span { font-size: 10px; }
.principle-lenses p { font-size: 14px; line-height: 1.75; }
.phase { font-size: 11px; }
.explain-panel > p { font-size: 16px; line-height: 1.9; }
.why-box span { font-size: 10px; }
.why-box p { font-size: 14px; line-height: 1.8; }
.article-link { font-family: var(--sans); font-size: 13px; }
.visual-head h2 { font-size: 27px; }
.bit small { font-size: 10px; }
.flag-tag { font-size: 12px; }
.sandbox-head span {
  font-family: var(--sans);
  font-size: 11px;
}
.sandbox-head strong { font-size: 12px; }
.sandbox-actions button,
.flag-switches button {
  font-family: var(--sans);
  font-size: 11px;
}
.sandbox-message { font-family: var(--sans); font-size: 13px; line-height: 1.7; }
.bit-equation { font-size: 13px; }
.method-chip { font-size: 10px; }
.weight-bar div { font-size: 12px; }
.roll-label { font-family: var(--sans); font-size: 12px; }
.roll-input { font-size: 13px; }
.roll-axis { font-size: 10px; }
.roll-result { font-family: var(--sans); font-size: 13px; }
.random-note { font-size: 15px; }
.bag-item,
.pity-step { font-size: 11px; }
.seed-box { font-size: 12px; }
.space-contract span { font-size: 11px; }
.cell-coordinate,
.hash-sandbox .cell-coordinate { font-size: 10px; }
.grid-prompt span {
  font-family: var(--sans);
  font-size: 11px;
  letter-spacing: 0;
}
.grid-prompt strong { font-size: 12px; }
.grid-prompt em {
  font-family: var(--sans);
  font-size: 13px;
  line-height: 1.7;
}
.grid-comparison span { font-size: 10px; }
.grid-comparison strong { font-size: 15px; }
.space-formula { font-size: 13px; }
.tree-node-box,
.candidate { font-family: var(--sans); font-size: 12px; }
.metrics dt { font-size: 10px; }
.metrics dd { font-size: 13px; }
.code-head { font-size: 10px; }
.code-block li { font-size: 12px; line-height: 1.65; }
.control-buttons button { font-family: var(--sans); font-size: 12px; }
.hash-flow-step span { font-size: 11px; }
.hash-flow-step strong { font-family: var(--sans); font-size: 13px; line-height: 1.6; }
.hash-key-trace span,
.hash-bucket span { font-size: 11px; }
.hash-key-trace strong { font-size: 15px; }
.hash-key-trace small { font-family: var(--sans); font-size: 12px; }
.hash-bucket strong { font-size: 12px; }
.hash-bucket code { font-size: 15px; }
.hash-transfer strong { font-size: 12px; }
.hash-transfer span { font-family: var(--sans); font-size: 12px; }
.hash-sparse-note { font-family: var(--sans); font-size: 12px; line-height: 1.75; }