:root {
  --paper: #faf9f7;
  --ink: #171714;
  --forest: #164ea6;
  --quiet: #74736d;
  --rule: #d8d4cc;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--paper);
  color: var(--ink);
  /* Noto Sans Mono covers Vietnamese diacritics JetBrains Mono may miss */
  font-family: "JetBrains Mono", "Noto Sans Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.45;
  letter-spacing: -0.018em;
  word-spacing: -0.18em;
  -webkit-font-smoothing: antialiased;
}

html[lang="vi"] body {
  word-spacing: normal;
  letter-spacing: -0.01em;
  line-height: 1.5;
}

.page {
  width: min(100% - 48px, 804px);
  margin: 0 auto;
  padding: 32px 0 64px;
}

.lang-switch {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 7px;
  margin: 0 0 18px;
  color: var(--quiet);
  font-size: 12px;
  line-height: 1.4;
}

.lang-switch a.is-active {
  color: var(--ink);
  text-decoration: none;
  pointer-events: none;
}

.page:has(.intro:not([hidden])) > .lang-switch {
  width: 85%;
  margin-left: auto;
  margin-right: auto;
}

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

h1 {
  color: var(--forest);
  font-size: clamp(22.05px, 3.528vw, 28.224px);
  line-height: 1.18;
  letter-spacing: -0.055em;
  font-weight: 1000;
  white-space: nowrap;
}

.intro-copy { margin-top: 20px; }
.intro-copy p + p { margin-top: 14px; }

a {
  color: var(--forest);
  text-decoration: none;
  text-underline-offset: 3px;
}

a:hover, a:focus-visible { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--forest); outline-offset: 3px; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0 7px;
  margin: 28px 0 0;
  color: var(--quiet);
}

.page:has(.intro:not([hidden])) > .intro {
  width: 85%;
  margin: 0 auto;
}

.page:has(.intro:not([hidden])) > nav {
  width: 85%;
  margin: 28px auto 0;
}

.view { padding-top: 4px; }

h2 {
  display: inline-block;
  margin: 5px 0 20px;
  color: var(--ink);
  font-size: 18.6px;
  line-height: 1.3;
  font-weight: 960;
}

.breadcrumb {
  display: flex;
  gap: 11px;
  align-items: baseline;
  margin-bottom: 8px;
  font-size: inherit;
}

article { padding: 16px 0 19px; border-top: 1px solid var(--rule); }
article:last-child { border-bottom: 1px solid var(--rule); }

.research-list { display: grid; width: 100%; gap: 25px; margin: 0; padding: 0; list-style: none; }
.research-list > li { position: relative; }
.research-list > li::before {
  content: '•';
  position: absolute;
  top: 0;
  left: -1.05em;
}
.research-list h3 {
  margin-bottom: 8px;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  font-style: italic;
  line-height: inherit;
  letter-spacing: inherit;
}
.research-points { display: grid; gap: 7px; margin: 0; padding: 0; list-style: none; }
.research-points li { position: relative; padding-left: 1.15em; }
.research-points li::before { content: '›'; position: absolute; left: 0; color: var(--ink); }
.research-points span { display: block; margin-bottom: 7px; color: var(--quiet); font-size: 11px; }
.research-points .research-meta { padding-left: 0; }
.research-points .research-meta::before { content: none; }
.research-points .research-meta span { margin-bottom: 0; }

.eyebrow {
  margin-bottom: 5px;
  color: var(--quiet);
  font-size: 11px;
  line-height: 1.4;
}

h3 { margin-bottom: 7px; font-size: 14px; line-height: 1.5; font-weight: 840; }

.materials {
  display: flex;
  flex-wrap: wrap;
  gap: 0 7px;
  margin-top: 11px;
  font-size: 12px;
}

.plain-list { margin: 0; padding: 0; list-style: none; }
.plain-list li { padding: 15px 0; border-top: 1px solid var(--rule); }
.plain-list li:last-child { border-bottom: 1px solid var(--rule); }
.plain-list span { display: inline-block; min-width: 113px; color: var(--quiet); font-size: 11px; }
.plain-list.compact li { padding: 10px 0; }

.presentation-list li { padding: 17px 0; }
.presentation-title { font-weight: 840; line-height: 1.4; }
.presentation-meta { margin-top: 5px; color: var(--quiet); font-size: 12px; line-height: 1.45; }
.presentation-action { display: inline-block; margin-top: 6px; }

footer { margin-top: 56px; color: var(--quiet); font-size: 12px; }

@media (max-width: 560px) {
  body { font-size: 13px; line-height: 1.4; }
  html[lang="vi"] body { line-height: 1.48; }
  .page { width: min(100% - 36px, 804px); padding-top: 28px; }
  .breadcrumb { font-size: inherit; }
  .plain-list span { display: block; margin-bottom: 3px; }
  .page:has(.intro:not([hidden])) > .intro,
  .page:has(.intro:not([hidden])) > nav,
  .page:has(.intro:not([hidden])) > .lang-switch { width: 100%; }
}