:root {
  color-scheme: dark;
  --ground: #101110;
  --surface: #1a1c19;
  --raised: #242722;
  --line: #373b35;
  --ink: #e8eeec;
  --muted: #a6aaa0;
  --signal: #76cfdd;
  --reference: #e2bc74;
  --range: #83979d;
  --complete: #9db89a;
  --paper: #e1e6dc;
  --paper-ink: #1c2520;
  font-family: "IBM Plex Sans", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body { min-width: 320px; min-height: 100vh; margin: 0; background: var(--ground); color: var(--ink); }
button, input, select { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: .42; }
button:focus-visible, a:focus-visible, input:focus-visible, select:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; }

.navbar { display: grid; grid-template-columns: 1fr auto; align-items: center; height: 66px; padding: 0 max(32px, calc((100vw - 1560px) / 2)); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; width: fit-content; color: var(--ink); text-decoration: none; font: 600 15px "IBM Plex Mono", monospace; letter-spacing: -.035em; }
.brand-symbol { display: grid; place-items: center; width: 30px; height: 30px; background: var(--ink); color: var(--ground); font-size: 14px; }
.navbar ul { display: flex; justify-content: flex-end; gap: 30px; height: 100%; margin: 0; padding: 0; list-style: none; }
.navbar li { display: flex; align-items: center; }
.navbar a:not(.brand) { color: var(--muted); text-decoration: none; font-size: 13px; }
.navbar a:not(.brand):hover, .navbar a[aria-current] { color: var(--ink); }
.navbar a[aria-current] { font-weight: 600; }

.comparison-intro, .parts-container { max-width: 1560px; margin-right: auto; margin-left: auto; padding-right: 32px; padding-left: 32px; }
.comparison-intro { margin-top: 26px; }
.chapter-label { color: var(--signal); font: 12px "IBM Plex Sans", sans-serif; }
.comparison-intro h1 { margin: 9px 0 7px; font-size: clamp(26px, 2.5vw, 32px); font-weight: 500; letter-spacing: -.045em; line-height: 1.1; }
.comparison-intro p { margin: 0; color: var(--muted); font-size: 14px; }
.parts-container { display: grid; grid-template-columns: 205px minmax(0, 1fr) 230px; align-items: start; gap: 18px; margin-top: 24px; margin-bottom: 50px; }

.checkboxes-container { position: sticky; top: 18px; border-top: 1px solid var(--line); }
.checkboxes-container h2 { margin: 17px 0 2px; font-size: 15px; font-weight: 600; }
#selected-count { margin: 0 0 14px; color: var(--muted); font: 11px "IBM Plex Mono", monospace; }
.checkboxes-container .outer > div { display: flex; align-items: center; min-height: 43px; border-top: 1px solid var(--line); }
.checkboxes-container .outer > div:last-child { border-bottom: 1px solid var(--line); }
.checkboxes-container input { width: 16px; height: 16px; margin: 0 9px 0 3px; accent-color: var(--signal); }
.checkboxes-container label { color: var(--ink); cursor: pointer; font-size: 13px; }

.canvases-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(265px, 1fr)); align-items: start; gap: 12px; min-width: 0; }
.visual-key { grid-column: 1 / -1; display: flex; flex-wrap: wrap; gap: 8px 14px; min-height: 28px; align-items: center; color: var(--muted); font-size: 11px; }
.visual-key span { display: inline-flex; align-items: center; gap: 6px; }
.visual-key span::before { width: 8px; height: 8px; content: ""; }
.key-active::before { background: var(--signal); }.key-reference::before { background: var(--reference); }.key-range::before { background: var(--range); }.key-complete::before { background: var(--complete); }
.empty-state { grid-column: 1 / -1; padding: 32px 40px; background: var(--surface); }
.empty-state[hidden] { display: none; }
.empty-content { max-width: 580px; }
.empty-content > span { color: var(--signal); font: 12px "IBM Plex Sans", sans-serif; }
.empty-content h2 { margin: 14px 0 11px; font-size: 25px; font-weight: 500; letter-spacing: -.035em; }
.empty-content p { max-width: 480px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.6; }
.empty-content ul { max-width: 530px; margin: 22px 0 0; padding: 0; list-style: none; }
.empty-content li { display: grid; grid-template-columns: 100px minmax(0,1fr); gap: 12px; padding: 9px 0; border-top: 1px solid var(--line); font-size: 13px; line-height: 1.5; }
.empty-content li strong { color: var(--ink); font-weight: 600; }
.empty-content li span { color: var(--muted); }
.empty-content button { margin-top: 23px; min-height: 36px; padding: 0 16px; border: 0; background: var(--ink); color: var(--ground); font-size: 13px; font-weight: 600; }
.empty-content button:hover { background: #d6ded2; }

.algorithm-card { min-width: 0; padding: 16px; background: var(--surface); }
.card-heading { display: flex; justify-content: space-between; align-items: start; gap: 10px; min-height: 43px; }
.card-heading h2 { margin: 0; font-size: 17px; font-weight: 500; letter-spacing: -.02em; }
.card-time { display: flex; align-items: flex-end; flex-direction: column; white-space: nowrap; }
.card-time span { color: var(--muted); font-size: 11px; }
.card-time output { color: var(--ink); font: 12px "IBM Plex Mono", monospace; font-variant-numeric: tabular-nums; }
.algorithm-card canvas { display: block; width: 100%; height: auto; background: #111310; }
.algorithm-status { min-height: 37px; margin: 10px 0; color: var(--muted); font-size: 13px; line-height: 1.4; overflow-wrap: anywhere; }
.card-metrics { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin: 0; padding-top: 11px; border-top: 1px solid var(--line); }
.card-metrics dt { color: var(--muted); font-size: 11px; }
.card-metrics dd { margin: 3px 0 0; color: var(--ink); font: 500 18px "IBM Plex Mono", monospace; font-variant-numeric: tabular-nums; }

.setting-container { position: sticky; top: 18px; padding: 20px; background: var(--paper); color: var(--paper-ink); }
.setting-container h2 { margin: 0 0 18px; font-size: 20px; font-weight: 500; letter-spacing: -.03em; }
.setting-outer { display: flex; flex-direction: column; }
.setting-container label { display: block; margin-bottom: 7px; color: #4f5e52; font-size: 12px; }
.setting-container select { width: 100%; height: 36px; padding: 0 9px; border: 1px solid #879487; border-radius: 0; background: var(--paper); color: var(--paper-ink); font-size: 13px; }
.setting-container .data-controls { display: flex; flex-direction: column; gap: 0; }
.setting-container .data-controls select { margin-bottom: 14px; }
.speed-heading { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.speed-heading output { font: 12px "IBM Plex Mono", monospace; white-space: nowrap; }
.setting-container input[type="range"] { display: block; width: 100%; height: 34px; margin: 0; appearance: none; -webkit-appearance: none; background: transparent; }
.setting-container input[type="range"]::-webkit-slider-runnable-track { height: 2px; background: #718174; }
.setting-container input[type="range"]::-moz-range-track { height: 2px; background: #718174; }
.setting-container input[type="range"]::-webkit-slider-thumb { width: 14px; height: 14px; margin-top: -6px; border: 2px solid var(--paper); border-radius: 50%; background: var(--paper-ink); appearance: none; -webkit-appearance: none; }
.setting-container input[type="range"]::-moz-range-thumb { width: 12px; height: 12px; border: 2px solid var(--paper); border-radius: 50%; background: var(--paper-ink); box-shadow: 0 0 0 1px var(--paper-ink); }
.speed-ends { display: flex; justify-content: space-between; color: #4f5e52; font: 11px "IBM Plex Sans", sans-serif; }
.setting-container button { width: 100%; min-height: 36px; margin-top: 8px; padding: 0 8px; border: 1px solid #879487; border-radius: 0; background: transparent; color: var(--paper-ink); font-size: 13px; }
.setting-container button:not(:disabled):hover { background: #cbd3c8; }
.setting-container #start-btn { margin-top: 22px; border-color: var(--paper-ink); background: var(--paper-ink); color: var(--paper); font-weight: 600; }
.setting-container #start-btn:not(:disabled):hover { background: #344038; }
.metric-note { margin: 17px 0 0; padding-top: 14px; border-top: 1px solid #a9b2a5; color: #586559; font-size: 11px; line-height: 1.5; }

@media (max-width: 1050px) {
  .parts-container { grid-template-columns: 170px minmax(0,1fr) 200px; gap: 12px; }
  .empty-state { padding: 26px; }
}
@media (max-width: 800px) {
  .parts-container { grid-template-columns: 1fr; }
  .checkboxes-container, .setting-container { position: static; }
  .checkboxes-container .outer { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); column-gap: 12px; }
  .checkboxes-container h2, #selected-count { grid-column: 1 / -1; }
  .setting-container { grid-row: 2; }
  .canvases-container { grid-row: 3; }
  .setting-outer { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px 12px; }
  .setting-container h2, .setting-container .data-controls, .metric-note { grid-column: 1 / -1; }
  .setting-container .data-controls { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); column-gap: 12px; }
  .setting-container .data-controls label { grid-row: 1; }
  .setting-container .data-controls select { grid-row: 2; }
  .setting-container #start-btn { margin-top: 8px; }
}
@media (max-width: 720px) {
  .navbar { grid-template-columns: 1fr auto; height: 56px; padding: 0 16px; }
  .navbar ul { gap: 18px; }
  .comparison-intro, .parts-container { padding-right: 16px; padding-left: 16px; }
  .comparison-intro { margin-top: 25px; }.comparison-intro h1 { font-size: 29px; }
  .parts-container { margin-top: 25px; }
  .empty-state { padding: 23px; }.empty-content h2 { font-size: 21px; }
  .empty-content li { grid-template-columns: 1fr; gap: 2px; }
}