@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: #07100f;
  --panel: #0b1716;
  --panel-2: #0e1d1b;
  --line: #28413d;
  --ink: #f3f7f5;
  --muted: #a8bab6;
  --mint: #79e0c2;
  --cyan: #7cd6ed;
  --lime: #c8f56b;
  --warm: #ffc878;
  --danger: #ff8580;
  --sans: "Noto Sans SC", "Microsoft YaHei UI", sans-serif;
  --serif: "Noto Serif SC", serif;
  --mono: "IBM Plex Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html { color-scheme: dark; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 78% 10%, rgba(124, 214, 237, .08), transparent 31rem),
    linear-gradient(rgba(121, 224, 194, .025) 1px, transparent 1px),
    var(--bg);
  background-size: auto, 100% 48px, auto;
  font-family: var(--sans);
}
button, select, a { font: inherit; }
a { color: inherit; text-decoration: none; }
button, select { color: var(--ink); }

.site-header {
  min-height: 72px; 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(5, 13, 12, .92); backdrop-filter: blur(16px);
}
.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: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--lime);
  border-radius: 50%; color: var(--lime);
}
.site-header nav a { color: var(--muted); font-size: 14px; }
.site-header nav a:hover { color: var(--lime); }

main { width: min(1560px, calc(100% - 40px)); margin: 0 auto; }
.hero {
  min-height: 320px; display: grid; grid-template-columns: minmax(0, 1.3fr) minmax(280px, .7fr);
  align-items: end; gap: 64px; padding: 74px 0 46px;
}
.eyebrow, .panel-label { color: var(--mint); font: 600 12px var(--mono); letter-spacing: .13em; }
.hero h1 { margin: 16px 0 0; font: 500 clamp(44px, 6vw, 82px)/1.15 var(--serif); letter-spacing: -.04em; }
.hero h1 em { color: var(--lime); font-style: normal; }
.hero p { margin: 0 0 10px; color: var(--muted); font-size: 17px; line-height: 1.9; }

.runtime-map {
  display: flex; align-items: center; gap: 10px; overflow-x: auto; margin-bottom: 22px;
  padding: 15px 18px; border: 1px solid var(--line); border-radius: 10px; background: #091412;
}
.runtime-map span {
  flex: 0 0 auto; padding: 8px 11px; border: 1px solid #36544f; border-radius: 6px;
  color: #d9e8e4; background: #0d1c1a; font: 500 12px var(--mono);
}
.runtime-map i { color: var(--mint); font-style: normal; }

.lab { overflow: hidden; border: 1px solid #3d6058; border-radius: 12px; background: #081311; box-shadow: 0 34px 90px #0006; }
.lab-head {
  display: flex; align-items: flex-end; justify-content: space-between; gap: 22px; padding: 21px 26px;
  border-bottom: 1px solid var(--line);
}
.lab-head h2 { margin: 6px 0 0; font: 500 24px var(--serif); }
.step-readout { display: flex; gap: 14px; align-items: baseline; font-family: var(--mono); }
.step-readout span { color: var(--lime); font-size: 12px; }
.step-readout strong { color: var(--muted); font-size: 14px; }

.case-tabs { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.case-tab {
  min-height: 58px; padding: 12px 18px; border: 0; border-right: 1px solid var(--line);
  color: var(--muted); background: #0a1514; font-size: 14px; cursor: pointer;
}
.case-tab:last-child { border-right: 0; }
.case-tab:hover { color: var(--ink); background: #10201d; }
.case-tab.is-active { color: var(--ink); background: #13241f; box-shadow: inset 0 -3px var(--lime); }

.scenario-parameters {
  display: grid; grid-template-columns: minmax(250px, 1.4fr) repeat(4, minmax(150px, 1fr));
  gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--line); background: #0b1715;
}
.parameter-note { display: flex; flex-direction: column; justify-content: center; gap: 5px; }
.parameter-note strong { color: var(--warm); font: 600 12px var(--mono); letter-spacing: .08em; }
.parameter-note span { color: var(--muted); font-size: 13px; }
.scenario-parameters label, .speed-control { display: grid; gap: 6px; color: var(--muted); font: 500 12px var(--mono); }
select {
  min-height: 36px; padding: 0 10px; border: 1px solid #3c5651; border-radius: 5px;
  background: #0d1c1a; font-size: 12px; cursor: pointer;
}
select:focus-visible, button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 2px; }

.principle-lenses { display: grid; grid-template-columns: repeat(3, 1fr); border-bottom: 1px solid var(--line); }
.principle-lenses article { padding: 17px 21px; border-right: 1px solid var(--line); background: #0a1513; }
.principle-lenses article:last-child { border-right: 0; }
.principle-lenses span { color: var(--mint); font: 600 12px var(--mono); letter-spacing: .09em; }
.principle-lenses p { margin: 8px 0 0; color: #c2d1cd; font-size: 13px; line-height: 1.7; }

.lab-grid { display: grid; grid-template-columns: 310px minmax(440px, 1fr) 340px; min-height: 680px; }
.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 12px var(--mono); letter-spacing: .1em; }
.explain-panel h2 { margin: 15px 0; font: 500 34px/1.3 var(--serif); }
.explain-panel > p { margin: 0; color: #d0ddda; font-size: 16px; line-height: 1.85; }
.change-box, .why-box { margin-top: 22px; padding: 15px 16px; border-left: 2px solid var(--cyan); background: #0d1d1b; }
.why-box { border-left-color: var(--lime); }
.change-box span, .why-box span { color: var(--cyan); font: 600 12px var(--mono); letter-spacing: .06em; }
.why-box span { color: var(--lime); }
.change-box p, .why-box p { margin: 8px 0 0; color: var(--muted); font-size: 14px; line-height: 1.7; }
.article-link { margin-top: auto; padding-top: 26px; color: var(--mint); font: 500 12px var(--mono); }

.visual-panel { background: radial-gradient(circle at 50% 22%, rgba(121, 224, 194, .07), transparent 24rem), #091513; }
.visual-head { display: flex; justify-content: space-between; gap: 20px; align-items: flex-start; }
.visual-head h2 { margin: 6px 0 0; font: 500 25px var(--serif); }
.visual-status { color: var(--lime); font: 600 14px var(--mono); letter-spacing: .07em; }
.effect-state { display: grid; grid-template-columns: 180px 1fr; gap: 20px; align-items: center; margin: 26px 0; }
.value-ring {
  aspect-ratio: 1; display: grid; place-content: center; text-align: center; border: 1px solid #52756c;
  border-radius: 50%; background: #0d1d1a; box-shadow: inset 0 0 44px rgba(121, 224, 194, .055);
}
.value-ring small { color: var(--mint); font: 600 12px var(--mono); letter-spacing: .1em; }
.value-ring strong { margin: 7px 0; color: var(--lime); font: 600 48px var(--mono); }
.value-ring span { color: var(--muted); font: 12px var(--mono); }
.value-ring b { color: var(--ink); }
.state-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.state-cards div { min-height: 75px; padding: 13px; border: 1px solid var(--line); border-radius: 7px; background: #0c1a18; }
.state-cards span { display: block; margin-bottom: 9px; color: var(--muted); font: 12px var(--mono); }
.state-cards strong { color: #e6efec; font: 500 14px var(--mono); }

.lifecycle-track { display: grid; grid-template-columns: repeat(5, 1fr); gap: 7px; padding: 0; margin: 8px 0 22px; list-style: none; }
.lifecycle-track li {
  min-height: 52px; display: grid; place-items: center; padding: 7px; border: 1px solid var(--line);
  border-radius: 5px; color: #6f8781; background: #0a1514; font: 500 12px/1.45 var(--mono); text-align: center;
}
.lifecycle-track li.is-past { color: #a9c9c0; border-color: #36564f; }
.lifecycle-track li.is-current { color: #07100f; border-color: var(--lime); background: var(--lime); }
.period-log { padding: 16px; border: 1px solid var(--line); border-radius: 7px; background: #0b1816; }
.period-log > span { color: var(--warm); font: 600 12px var(--mono); letter-spacing: .09em; }
.period-log ul { margin: 11px 0 0; padding-left: 20px; color: #cbd8d4; font: 12px/1.75 var(--mono); }

.inspect-panel { display: flex; flex-direction: column; gap: 24px; background: #091311; }
.metrics { display: grid; grid-template-columns: 1fr auto; gap: 10px 14px; margin: 15px 0 0; }
.metrics div { display: contents; }
.metrics dt { color: var(--muted); font-size: 13px; }
.metrics dd { margin: 0; color: var(--ink); font: 500 12px var(--mono); text-align: right; }
.comparison { padding: 15px; border: 1px solid #38554f; border-radius: 7px; background: #0d1b19; }
.compare-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 13px; }
.compare-grid div { padding: 11px; border: 1px solid var(--line); border-radius: 5px; }
.compare-grid small { display: block; color: var(--muted); font: 12px var(--mono); }
.compare-grid strong { display: block; margin-top: 7px; color: var(--lime); font: 500 12px var(--mono); }
.comparison p { margin: 11px 0 0; color: var(--muted); font-size: 12px; line-height: 1.65; }
.code-block { margin-top: auto; overflow: hidden; border: 1px solid var(--line); border-radius: 7px; background: #07100f; }
.code-head { display: flex; justify-content: space-between; padding: 10px 12px; border-bottom: 1px solid var(--line); color: var(--muted); font: 12px var(--mono); }
.code-head strong { color: var(--mint); }
#code-lines { margin: 0; padding: 13px 12px 13px 45px; font: 13px/1.72 var(--mono); white-space: pre; overflow-x: auto; }
#code-lines li { padding: 1px 7px; color: #93aaa4; }
#code-lines li.is-active { color: #f5f9f7; background: #16302a; box-shadow: inset 2px 0 var(--lime); }

.controls {
  display: grid; grid-template-columns: 150px 1fr auto; align-items: end; gap: 18px; padding: 17px 22px;
  border-top: 1px solid var(--line); background: #0b1715;
}
.step-dots { display: flex; justify-content: center; gap: 7px; padding-bottom: 12px; }
.lab-dot {
  width: 9px; height: 9px; padding: 0; border: 1px solid #547069; border-radius: 50%;
  background: transparent; cursor: pointer;
}
.lab-dot.is-past { border-color: var(--mint); background: #346b5c; }
.lab-dot.is-active { border-color: var(--lime); background: var(--lime); transform: scale(1.25); }
.control-buttons { display: flex; gap: 8px; justify-content: flex-end; }
.control-buttons button {
  min-height: 42px; padding: 0 15px; border: 1px solid #45615b; border-radius: 5px;
  color: #dce7e4; background: #101f1d; cursor: pointer;
}
.control-buttons button:hover:not(:disabled) { border-color: var(--mint); }
.control-buttons button:disabled { opacity: .36; cursor: not-allowed; }
.control-buttons .auto-button.is-playing { color: #07100f; border-color: var(--warm); background: var(--warm); }
.control-buttons .next-button { color: #07100f; border-color: var(--lime); background: var(--lime); font-weight: 600; }

.reading-notes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 70px 0 90px; border: 1px solid var(--line); background: var(--line); }
.reading-notes div { min-height: 220px; padding: 28px; background: var(--bg); }
.reading-notes span { color: var(--mint); font: 600 12px var(--mono); }
.reading-notes h2 { margin: 22px 0 12px; font: 500 24px var(--serif); }
.reading-notes p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.8; }

@media (max-width: 1180px) {
  .scenario-parameters { grid-template-columns: repeat(2, 1fr); }
  .parameter-note { grid-column: 1 / -1; }
  .lab-grid { grid-template-columns: 280px minmax(420px, 1fr); }
  .inspect-panel { grid-column: 1 / -1; border-top: 1px solid var(--line); }
  .inspect-panel { display: grid; grid-template-columns: .7fr .8fr 1.5fr; }
  .code-block { margin-top: 0; }
}

@media (max-width: 780px) {
  main { width: min(100% - 24px, 1560px); }
  .site-header { align-items: flex-start; padding: 16px 18px; }
  .site-header nav { justify-content: flex-end; flex-wrap: wrap; gap: 10px 16px; }
  .hero { min-height: 0; grid-template-columns: 1fr; gap: 24px; padding: 52px 0 36px; }
  .hero h1 { font-size: clamp(38px, 12vw, 58px); }
  .case-tabs, .principle-lenses, .reading-notes { grid-template-columns: 1fr; }
  .case-tab, .principle-lenses article { border-right: 0; border-bottom: 1px solid var(--line); }
  .scenario-parameters { grid-template-columns: 1fr; }
  .lab-grid { display: block; }
  .explain-panel, .visual-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .effect-state { grid-template-columns: 1fr; }
  .value-ring { width: 180px; margin: 0 auto; }
  .lifecycle-track { grid-template-columns: repeat(2, 1fr); }
  .inspect-panel { display: flex; }
  .controls { grid-template-columns: 1fr; align-items: stretch; }
  .step-dots { order: -1; }
  .control-buttons { display: grid; grid-template-columns: 1fr 1fr; }
}