:root {
  color-scheme: light;
  --paper: #f3f6f2;
  --ink: #07140f;
  --muted: #55615b;
  --line: #aeb8b1;
  --signal: #c7ff3f;
  --signal-dark: #8fce00;
  --white: #fff;
  --page: min(1520px, calc(100% - 48px));
  --display: "Microsoft YaHei UI", "PingFang SC", "Hiragino Sans GB", sans-serif;
  --body: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  line-break: strict;
  overflow-wrap: break-word;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--body);
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}
button, input, select { color: inherit; font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { border: 0; }
a { color: inherit; }
img { display: block; width: 100%; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; }
p { text-wrap: pretty; }
[hidden] { display: none !important; }

.skip-link {
  position: fixed;
  z-index: 100;
  top: 8px;
  left: 8px;
  padding: 10px 14px;
  color: var(--ink);
  background: var(--signal);
  transform: translateY(-160%);
}
.skip-link:focus { transform: none; }
:focus-visible { outline: 3px solid #4575ff; outline-offset: 4px; }

.topbar {
  width: var(--page);
  min-height: 64px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  margin: 0 auto;
  border-bottom: 1px solid var(--ink);
  font-size: 12px;
}
.brand { display: flex; width: max-content; align-items: center; gap: 10px; text-decoration: none; }
.brand span {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  color: var(--signal);
  background: var(--ink);
  font-family: var(--display);
  font-size: 18px;
  font-weight: 900;
}
.brand strong { font-size: 14px; }
.topbar > p:nth-child(2) { color: var(--muted); letter-spacing: .08em; }
#library-status { justify-self: end; font-variant-numeric: tabular-nums; }

.question-stage {
  width: var(--page);
  min-height: calc(100svh - 84px);
  display: grid;
  grid-template-columns: minmax(330px, .8fr) minmax(520px, 1.35fr);
  gap: clamp(40px, 7vw, 120px);
  margin: 20px auto 0;
  padding: clamp(36px, 6vw, 88px);
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}
.question-intro { display: flex; flex-direction: column; justify-content: space-between; min-width: 0; }
.eyebrow {
  width: max-content;
  padding: 5px 8px;
  color: var(--ink);
  background: var(--signal);
  font-size: 11px;
  font-weight: 800;
}
.question-intro h1 {
  margin: clamp(36px, 7vh, 72px) 0;
  font-size: clamp(64px, 8.2vw, 136px);
  font-weight: 950;
  letter-spacing: -.09em;
  line-height: .82;
}
.question-intro h1 em { color: var(--signal); font-style: normal; }
.question-deck { max-width: 34em; color: #bdc7c1; font-size: clamp(15px, 1.25vw, 19px); }

.route-console {
  position: relative;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-content: center;
  gap: 0 20px;
}
.route-line {
  position: relative;
  grid-row: 1 / 3;
  min-height: 620px;
  border-left: 1px solid #486055;
}
.route-line-fill {
  position: absolute;
  top: 0;
  left: -2px;
  width: 3px;
  height: 100%;
  background: var(--signal);
  transform: scaleY(var(--route-progress, .12));
  transform-origin: top;
  transition: transform 700ms cubic-bezier(.2,.75,.2,1);
}
.route-line i {
  position: absolute;
  left: -7px;
  width: 13px;
  height: 13px;
  border: 2px solid var(--ink);
  outline: 1px solid #6f8278;
  background: var(--ink);
  transform: rotate(45deg);
}
.route-line i:nth-of-type(1) { top: 5%; }
.route-line i:nth-of-type(2) { top: 48%; }
.route-line i:nth-of-type(3) { bottom: 4%; }

.situation-list { align-self: center; border-top: 1px solid #50645a; }
.situation-list button {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 4px 24px;
  padding: clamp(24px, 3vw, 38px) 0;
  border-bottom: 1px solid #50645a;
  color: var(--white);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.situation-list button::after {
  content: "→";
  grid-column: 2;
  grid-row: 1 / 4;
  align-self: center;
  color: var(--signal);
  font-size: 30px;
}
.situation-list button:hover strong,
.situation-list button[aria-pressed="true"] strong { color: var(--signal); }
.situation-list button[aria-pressed="true"] { border-bottom-color: var(--signal); }
.situation-list span, .situation-list small { color: #91a198; font-size: 12px; }
.situation-list strong { font-size: clamp(22px, 2.4vw, 39px); line-height: 1.15; }

.path-panel { align-self: end; margin-top: 32px; }
.path-panel > p { color: #91a198; font-size: 13px; }
.path-title { display: flex; align-items: baseline; justify-content: space-between; gap: 20px; margin-bottom: 14px; }
.path-title h2 { max-width: 14em; font-size: 19px; }
.path-title span { color: var(--signal); font-size: 11px; }
.path-stages { display: grid; gap: 0; }
.path-stage {
  width: 100%;
  display: grid;
  grid-template-columns: 38px minmax(0, 1fr) auto;
  gap: 10px 16px;
  padding: 16px 0;
  border-top: 1px solid #3f534a;
  color: var(--white);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.path-stage b { color: var(--signal); font-size: 12px; font-variant-numeric: tabular-nums; }
.path-stage strong { font-size: 15px; }
.path-stage small { grid-column: 2; color: #91a198; }
.path-stage::after { content: "↗"; grid-column: 3; grid-row: 1 / 3; align-self: center; }

.recent, .featured, .archive, .site-footer { width: var(--page); margin-inline: auto; }
.recent { padding: clamp(70px, 8vw, 120px) 0 0; }
.recent-heading {
  display: grid;
  grid-template-columns: 1fr minmax(280px, .65fr);
  gap: 40px;
  align-items: end;
  padding-bottom: 22px;
  border-bottom: 4px solid var(--ink);
}
.recent-heading > div > p { font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.recent-heading h2 { margin-top: 8px; font-size: clamp(34px, 4.2vw, 64px); letter-spacing: -.05em; line-height: 1; }
.recent-heading > p { color: var(--muted); font-size: 13px; }
.recent-list { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); border-bottom: 1px solid var(--ink); }
.recent-item {
  min-height: 280px;
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto 1fr auto;
  gap: 14px;
  padding: 22px;
  border-right: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.recent-item:last-child { border-right: 0; }
.recent-date, .recent-number { color: var(--muted); font-size: 11px; font-variant-numeric: tabular-nums; }
.recent-item strong { grid-column: 1 / -1; align-self: end; font-family: var(--display); font-size: clamp(20px, 2vw, 31px); line-height: 1.12; }
.recent-item small { grid-column: 1 / -1; display: -webkit-box; overflow: hidden; color: var(--muted); -webkit-box-orient: vertical; -webkit-line-clamp: 3; }
.recent-arrow { justify-self: end; color: var(--signal-dark); }
.recent-item:hover { color: var(--signal); background: var(--ink); }
.recent-item:hover :is(.recent-date, .recent-number, small) { color: #aebbb4; }
.featured { padding: clamp(80px, 10vw, 150px) 0; }
.section-heading {
  display: grid;
  grid-template-columns: .55fr 1.2fr .8fr;
  align-items: end;
  gap: 42px;
  padding-bottom: 24px;
  border-bottom: 4px solid var(--ink);
}
.section-heading > p:first-child, .archive-heading > div > p {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: .12em;
}
.section-heading h2, .archive-heading h2 { font-size: clamp(35px, 4.4vw, 68px); letter-spacing: -.055em; line-height: .98; }
.section-heading > p:last-child { color: var(--muted); font-size: 14px; }
.featured-grid {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  grid-template-rows: repeat(4, minmax(132px, auto));
  border-bottom: 1px solid var(--ink);
}
.feature-card {
  position: relative;
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  padding: 22px 0 22px 24px;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.feature-card:not(.feature-lead) { grid-column: 2; }
.feature-card:last-child { border-bottom: 0; }
.feature-lead {
  grid-column: 1;
  grid-row: 1 / 5;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 0 38px 0 0;
  border-right: 1px solid var(--ink);
  border-bottom: 0;
}
.feature-cover { aspect-ratio: 4 / 3; overflow: hidden; background: #d6e1da; }
.feature-cover img { height: 100%; object-fit: cover; filter: grayscale(1) contrast(1.12); mix-blend-mode: multiply; transition: transform 250ms ease; }
.feature-card:hover img { transform: scale(1.018); }
.feature-lead .feature-cover { width: 100%; aspect-ratio: 16 / 10; }
.feature-copy { min-width: 0; }
.feature-lead .feature-copy { padding: 26px 0; }
.feature-meta { color: var(--muted); font-size: 11px; }
.feature-title { display: block; margin-top: 6px; font-family: var(--display); font-size: clamp(19px, 2vw, 31px); font-weight: 800; line-height: 1.17; }
.feature-lead .feature-title { max-width: 15em; font-size: clamp(35px, 4vw, 62px); letter-spacing: -.045em; line-height: 1.04; }
.feature-summary { display: -webkit-box; margin-top: 10px; overflow: hidden; color: var(--muted); font-size: 13px; -webkit-box-orient: vertical; -webkit-line-clamp: 2; }
.feature-byline { display: block; margin-top: 12px; color: var(--ink); font-size: 11px; }
.loading { padding: 48px 0; color: var(--muted); }

.archive { padding-bottom: 100px; }
.archive-heading {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: end;
  padding: 42px 0 28px;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.archive-heading h2 { max-width: 14em; margin-top: 8px; }
.archive-trigger {
  min-width: 250px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 18px;
  color: var(--signal);
  background: var(--ink);
  cursor: pointer;
  font-weight: 800;
}
.archive-tools {
  display: grid;
  grid-template-columns: 1fr 220px 180px;
  gap: 24px;
  padding: 22px 0;
  border-bottom: 1px solid var(--ink);
}
.archive-tools label { display: grid; gap: 5px; }
.archive-tools span { color: var(--muted); font-size: 10px; font-weight: 700; }
.archive-tools input, .archive-tools select { height: 38px; border: 0; border-bottom: 1px solid var(--ink); border-radius: 0; background: transparent; }
.archive-count { padding: 16px 0 8px; color: var(--muted); font-size: 12px; }
.archive-list { border-top: 1px solid var(--ink); }
.archive-item {
  width: 100%;
  display: grid;
  grid-template-columns: 112px 190px minmax(260px, 1fr) minmax(220px, .8fr) 28px;
  gap: 20px;
  align-items: center;
  padding: 21px 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.archive-item time, .archive-item .archive-section { color: var(--muted); font-size: 12px; }
.archive-title { font-family: var(--display); font-size: 18px; font-weight: 800; line-height: 1.25; }
.archive-summary { color: var(--muted); font-size: 12px; }
.archive-item:hover .archive-title { text-decoration: underline; text-underline-offset: 4px; }

.site-footer {
  min-height: 330px;
  display: grid;
  grid-template-columns: .5fr 1fr auto;
  gap: 48px;
  align-items: center;
  padding: 54px;
  color: var(--white);
  background: var(--ink);
}
.footer-mark { color: var(--signal); font-family: var(--display); font-size: clamp(100px, 15vw, 220px); font-weight: 950; line-height: .7; }
.site-footer h2 { font-size: clamp(27px, 3vw, 46px); line-height: 1.1; }
.site-footer div p { max-width: 42em; margin-top: 18px; color: #aab8b0; }
.site-footer a { align-self: end; color: var(--signal); font-size: 12px; }

.detail-backdrop { position: fixed; z-index: 40; inset: 0; background: rgb(7 20 15 / 72%); }
.detail {
  position: fixed;
  z-index: 50;
  top: 0;
  right: 0;
  width: min(680px, 92vw);
  height: 100dvh;
  padding: 28px clamp(24px, 5vw, 62px) 60px;
  overflow-y: auto;
  background: var(--paper);
  box-shadow: -18px 0 0 var(--signal);
  transform: translateX(calc(100% + 24px));
  transition: transform 320ms cubic-bezier(.2,.75,.2,1);
}
.detail.is-open { transform: none; }
.detail-close { margin-left: auto; padding: 8px 0; border-bottom: 1px solid; background: transparent; cursor: pointer; }
.detail-cover { margin: 36px 0 28px; aspect-ratio: 16 / 9; overflow: hidden; background: #d6e1da; }
.detail-cover img { height: 100%; object-fit: cover; }
.detail-kicker { color: var(--muted); font-size: 11px; font-weight: 800; }
.detail-cover img { filter: grayscale(1) contrast(1.12); mix-blend-mode: multiply; }
.detail h2 { margin-top: 10px; overflow-wrap: anywhere; font-size: clamp(34px, 4.6vw, 56px); letter-spacing: -.05em; line-height: 1.03; }
.detail-summary { margin-top: 24px; font-size: 17px; line-height: 1.8; }
.detail-attribution { margin-top: 30px; padding: 18px 0; border-top: 1px solid; border-bottom: 1px solid; }
.detail-attribution strong { display: block; font-size: 15px; }
.detail-attribution p { margin-top: 7px; color: var(--muted); font-size: 12px; }
.detail-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 22px; }
.detail-tags span { padding: 5px 8px; border: 1px solid var(--ink); font-size: 11px; }
.detail-link { display: flex; justify-content: space-between; margin-top: 34px; padding: 18px; color: var(--signal); background: var(--ink); text-decoration: none; font-weight: 800; }
body.detail-open { overflow: hidden; }
.noscript { margin: 20px; padding: 18px; border: 1px solid; }

@media (max-width: 1000px) {
  .question-stage { grid-template-columns: minmax(270px, .65fr) minmax(420px, 1fr); padding: 42px; gap: 48px; }
  .question-intro h1 { font-size: clamp(58px, 8vw, 86px); }
  .section-heading { grid-template-columns: .5fr 1.3fr; }
  .section-heading > p:last-child { grid-column: 2; }
  .featured-grid { grid-template-columns: 1.1fr .9fr; }
  .archive-item { grid-template-columns: 90px 150px minmax(220px, 1fr) 24px; }
  .archive-summary { display: none; }
}

@media (max-width: 760px) {
  :root { --page: calc(100% - 24px); }
  .topbar { grid-template-columns: 1fr auto; min-height: 56px; }
  .topbar > p:nth-child(2) { display: none; }
  #library-status { font-size: 10px; }
  .question-stage {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 54px;
    margin-top: 12px;
    padding: 28px 20px 44px;
  }
  .question-intro h1 { margin: 42px 0 28px; font-size: clamp(66px, 21vw, 98px); }
  .question-deck { max-width: 28em; font-size: 14px; }
  .route-console { grid-template-columns: 20px minmax(0, 1fr); gap: 0 12px; }
  .route-line { min-height: 620px; }
  .situation-list button { padding: 24px 0; }
  .situation-list strong { font-size: 23px; }
  .path-stage { grid-template-columns: 28px minmax(0, 1fr) 18px; gap: 8px; }
  .featured { padding: 76px 0; }
  .section-heading { display: block; padding-bottom: 18px; }
  .recent-heading { display: block; }
  .recent-heading > p { margin-top: 18px; }
  .recent-list { grid-template-columns: 1fr; }
  .recent-item { min-height: 0; grid-template-columns: 68px 28px minmax(0, 1fr) 18px; grid-template-rows: auto auto; gap: 8px 10px; padding: 20px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .recent-item strong { grid-column: 3; grid-row: 1; align-self: start; font-size: 18px; }
  .recent-item small { grid-column: 3; grid-row: 2; }
  .recent-arrow { grid-column: 4; grid-row: 1 / 3; align-self: center; }
  .section-heading h2 { margin: 10px 0 20px; font-size: 42px; }
  .featured-grid { display: block; }
  .feature-card, .feature-card:not(.feature-lead) { display: grid; grid-template-columns: 100px minmax(0, 1fr); padding: 18px 0; border-right: 0; border-bottom: 1px solid var(--line); }
  .feature-lead { display: block; }
  .feature-lead .feature-copy { padding: 20px 0 28px; }
  .feature-lead .feature-title { font-size: 38px; }
  .feature-copy .feature-title { font-size: 18px; }
  .feature-card:not(.feature-lead) .feature-summary { display: none; }
  .archive-heading { display: block; }
  .archive-heading h2 { font-size: 39px; }
  .archive-trigger { width: 100%; margin-top: 26px; }
  .archive-tools { grid-template-columns: 1fr 1fr; gap: 16px; }
  .archive-tools label:first-child { grid-column: 1 / -1; }
  .archive-item { grid-template-columns: 74px minmax(0, 1fr) 18px; gap: 12px; padding: 18px 0; }
  .archive-item .archive-section { display: none; }
  .archive-title { font-size: 16px; }
  .site-footer { grid-template-columns: 1fr; gap: 28px; padding: 48px 24px; }
  .footer-mark { font-size: 120px; }
  .site-footer a { justify-self: start; }
  .detail { width: calc(100vw - 14px); box-shadow: -8px 0 0 var(--signal); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .001ms !important; animation-duration: .001ms !important; }
  .route-line-fill { transform: scaleY(1); }
}