:root {
  --paper: #f1eee5;
  --paper-deep: #e7e0d2;
  --ink: #171714;
  --muted: #6e685f;
  --line: #c8c0b1;
  --signal: #d9472b;
  --signal-dark: #9e2c1a;
  --green: #1e6b56;
  --blue: #235aa6;
  --amber: #986e17;
  --display: "Iowan Old Style", "Baskerville", "Songti SC", serif;
  --body: "Avenir Next", "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --mono: "SFMono-Regular", "Roboto Mono", monospace;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  background: var(--ink);
}

body {
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(23, 23, 20, .035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 23, 20, .025) 1px, transparent 1px),
    var(--paper);
  background-size: 28px 28px;
  font: 16px/1.72 var(--body);
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

.skip-link {
  position: fixed;
  inset: 8px auto auto 8px;
  z-index: 20;
  padding: 10px 14px;
  color: #fff;
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus { transform: translateY(0); }

.masthead,
main,
.site-footer {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.masthead {
  position: relative;
  padding: 32px 0 72px;
  border-top: 8px solid var(--ink);
}

.masthead::after {
  content: "RESEARCH FILE  /  26·07·26";
  position: absolute;
  right: 0;
  top: 32px;
  color: var(--muted);
  font: 700 11px/1 var(--mono);
  letter-spacing: .15em;
}

.eyebrow,
.section-kicker,
.event-meta,
.metric-label,
.source-type {
  font: 700 11px/1.35 var(--mono);
  letter-spacing: .12em;
  text-transform: uppercase;
}

.eyebrow { color: var(--signal-dark); }

h1,
h2,
h3,
p { margin-top: 0; }

h1 {
  max-width: 940px;
  margin: 42px 0 24px;
  font: 700 clamp(50px, 9vw, 118px)/.88 var(--display);
  letter-spacing: -.055em;
}

.title-accent {
  color: var(--signal);
  font-style: italic;
}

.dek {
  max-width: 760px;
  margin-bottom: 42px;
  color: #3f3b35;
  font: 400 clamp(19px, 2.5vw, 29px)/1.45 var(--display);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr repeat(3, .65fr);
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.hero-cell {
  min-height: 138px;
  padding: 22px 18px;
  border-left: 1px solid var(--line);
}

.hero-cell:first-child { border-left: 0; padding-left: 0; }

.hero-cell strong {
  display: block;
  margin-top: 16px;
  font: 700 clamp(30px, 4vw, 52px)/1 var(--display);
}

.hero-cell p { margin: 14px 0 0; color: var(--muted); font-size: 13px; }

.thesis {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  padding: 76px 0;
  border-bottom: 1px solid var(--ink);
}

.thesis blockquote {
  margin: 0;
  font: 500 clamp(29px, 4vw, 54px)/1.2 var(--display);
  letter-spacing: -.025em;
}

.thesis em { color: var(--signal-dark); }

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin: 0 0 28px;
}

.section-head h2 {
  margin-bottom: 0;
  font: 700 clamp(34px, 5vw, 68px)/1 var(--display);
  letter-spacing: -.04em;
}

.section-head p { max-width: 420px; margin: 0; color: var(--muted); }

.timeline-section,
.analysis-section,
.forecast-section,
.methods-section { padding: 76px 0; border-bottom: 1px solid var(--ink); }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 48px;
}

.filter-button {
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  color: var(--ink);
  background: transparent;
  font: 700 13px/1 var(--body);
  cursor: pointer;
}

.filter-button:hover,
.filter-button:focus-visible,
.filter-button[aria-pressed="true"] {
  color: var(--paper);
  background: var(--ink);
  outline: 0;
}

.timeline {
  position: relative;
  margin-left: 132px;
}

.timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 0;
  left: 11px;
  width: 1px;
  background: var(--ink);
}

.event {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 40px;
  margin-bottom: 58px;
  padding: 0 0 54px 54px;
  border-bottom: 1px solid var(--line);
}

.event::before {
  content: "";
  position: absolute;
  top: 5px;
  left: 5px;
  width: 13px;
  height: 13px;
  border: 2px solid var(--paper);
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 1px var(--ink);
}

.event-date {
  position: absolute;
  top: 0;
  right: calc(100% - 2px);
  width: 144px;
  padding-right: 32px;
  text-align: right;
  font: 700 14px/1.2 var(--mono);
}

.event h3 {
  margin: 10px 0 15px;
  font: 700 clamp(25px, 3vw, 39px)/1.1 var(--display);
  letter-spacing: -.025em;
}

.event-quote {
  margin: 22px 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--signal);
  color: #403c36;
  font: italic 18px/1.55 var(--display);
}

.event-aside { padding-top: 28px; }

.event-aside dl { margin: 0; }
.event-aside div { margin-bottom: 16px; }
.event-aside dt { color: var(--muted); font: 700 10px/1.2 var(--mono); letter-spacing: .1em; text-transform: uppercase; }
.event-aside dd { margin: 4px 0 0; font-size: 14px; }

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  margin: 0 6px 6px 0;
  padding: 5px 9px;
  border: 1px solid currentColor;
  border-radius: 3px;
  font: 700 10px/1 var(--mono);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.tag.fact { color: var(--green); }
.tag.inference { color: var(--amber); }
.tag.grade { color: var(--blue); }
.tag.card { color: var(--signal-dark); }

.source-link {
  display: inline-flex;
  min-height: 44px;
  align-items: center;
  gap: 8px;
  margin-top: 12px;
  font-weight: 700;
  text-underline-offset: 4px;
}

.source-link::after { content: "↗"; color: var(--signal); }

.reason-grid,
.forecast-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
}

.reason-card,
.forecast-card {
  min-height: 270px;
  padding: 24px;
  background: var(--paper);
}

.reason-card strong {
  display: block;
  margin: 24px 0 16px;
  font: 700 27px/1.1 var(--display);
}

.reason-card p,
.forecast-card p { color: var(--muted); font-size: 14px; }

.reason-index { color: var(--signal); font: 700 12px/1 var(--mono); }

.forecast-grid { grid-template-columns: 1fr 1fr; }
.forecast-card { min-height: 320px; }

.forecast-level {
  display: inline-block;
  margin: 30px 0 14px;
  padding: 8px 13px;
  color: #fff;
  background: var(--ink);
  font: 800 12px/1 var(--mono);
  letter-spacing: .12em;
}

.signal-list { margin: 18px 0 0; padding-left: 18px; }
.signal-list li { margin: 8px 0; }

.method-grid {
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 70px;
}

.method-grid h3 { font: 700 28px/1.2 var(--display); }

.source-list {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.source-list li {
  display: grid;
  grid-template-columns: 54px 1fr;
  gap: 14px;
  padding: 13px 0;
  border-top: 1px solid var(--line);
  font-size: 13px;
}

.site-footer {
  padding: 48px 0 64px;
  color: #cfc8bb;
  background: var(--ink);
}

.site-footer p { margin-bottom: 8px; }
.site-footer a { color: #fff; }
.is-hidden { display: none !important; }

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr 1fr; }
  .hero-cell:nth-child(3) { border-left: 0; }
  .thesis { grid-template-columns: 1fr; gap: 18px; }
  .reason-grid { grid-template-columns: 1fr 1fr; }
  .reason-card:last-child { grid-column: span 2; }
  .timeline { margin-left: 96px; }
  .event { grid-template-columns: 1fr; gap: 0; }
  .method-grid { grid-template-columns: 1fr; gap: 36px; }
}

@media (max-width: 560px) {
  .masthead,
  main,
  .site-footer { width: min(100% - 28px, 1180px); }
  .masthead { padding-bottom: 44px; }
  .masthead::after { display: none; }
  h1 { margin-top: 28px; }
  .hero-grid,
  .forecast-grid,
  .reason-grid { grid-template-columns: 1fr; }
  .hero-cell,
  .hero-cell:first-child { min-height: 112px; padding: 18px 0; border-left: 0; border-top: 1px solid var(--line); }
  .hero-cell:first-child { border-top: 0; }
  .section-head { display: block; }
  .section-head p { margin-top: 16px; }
  .timeline { margin-left: 0; }
  .timeline::before { left: 6px; }
  .event { padding-left: 34px; margin-bottom: 42px; }
  .event::before { left: 0; }
  .event-date { position: static; width: auto; margin-bottom: 10px; padding: 0; text-align: left; }
  .reason-card:last-child { grid-column: auto; }
  .reason-card,
  .forecast-card { min-height: auto; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}