/* ==========================================================================
   The 5000-Mile Think Tank for Africa-China Research — Stylesheet
   Redesigned to match the "Call for Submissions" flyer: bold black serif
   type on white, with an African-pattern block (top-right) and a
   Chinese-pattern block (bottom-left) framing every page.

   Design tokens:
     ink          #1A1A1A  text
     paper        #FFFFFF  page background
     paper-raised #F4EFE2  cards, dividers
     red          #C8281F  primary accent — links, buttons, African pattern
     navy         #1E3A73  secondary accent — nav state, dates, eyebrows
     gold         #D9A417  tertiary accent — used sparingly
   Type: Georgia / Times New Roman (system serif) throughout, bold for
   headings — matching the flyer's plain institutional serif.
   ========================================================================== */

:root {
  --ink: #1A1A1A;
  --paper: #FFFFFF;
  --paper-raised: #F4EFE2;
  --red: #C8281F;
  --navy: #1E3A73;
  --gold: #B8860B;

  --font-serif: Georgia, 'Times New Roman', Times, serif;

  --max-width: 880px;
  --edge: clamp(1.5rem, 5vw, 3rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.65;
}

a {
  color: var(--red);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover { color: var(--navy); }

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--navy);
  outline-offset: 3px;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-style: normal;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--ink);
}

h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.35rem, 3vw, 1.9rem); }
h3 { font-size: 1.15rem; }

p { margin: 0 0 1.1em; }

.eyebrow {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--navy);
  display: block;
  margin-bottom: 0.9em;
}

/* ---------- layout shell ---------- */

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--edge);
}

/* ---------- corner pattern blocks ---------- */
/* African pattern: top-right diagonal. Chinese pattern: bottom-left diagonal. */

.corner-triangle {
  position: absolute;
  pointer-events: none;
}
.corner-triangle--africa {
  top: 0;
  right: 0;
  background-image: url("../assets/patterns/african-pattern-tile.svg");
  background-repeat: repeat;
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}
.corner-triangle--china {
  bottom: 0;
  left: 0;
  background-image: url("../assets/patterns/china-pattern-tile.svg");
  background-repeat: repeat;
  clip-path: polygon(0 0, 100% 100%, 0 100%);
}

/* ---------- header / nav ---------- */

.site-header {
  border-bottom: 2px solid var(--ink);
  position: sticky;
  top: 0;
  background: var(--paper);
  z-index: 20;
  overflow: hidden;
}
.site-header .corner-triangle--africa {
  width: 76px;
  height: 76px;
  background-size: 22px 22px;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
  padding-right: calc(var(--edge) + 60px);
  max-width: 1040px;
  position: relative;
  z-index: 1;
}

.wordmark {
  color: var(--ink);
  text-decoration: none;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}
.wordmark:hover { color: var(--ink); }
.wordmark-main {
  font-family: var(--font-serif);
  font-weight: 700;
  font-style: normal;
  font-size: 1.15rem;
  white-space: nowrap;
}
.wordmark-sub {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--navy);
  white-space: nowrap;
}
.wordmark-sub-cn {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--red);
  display: flex;
  justify-content: space-between;
  width: 100%;
}

nav.primary-nav {
  display: flex;
  gap: clamp(0.9rem, 2vw, 1.6rem);
}
nav.primary-nav a {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink);
  text-decoration: none;
  padding: 0.3em 0;
  border-bottom: 2px solid transparent;
}
nav.primary-nav a:hover { color: var(--red); }
nav.primary-nav a[aria-current="page"] {
  color: var(--navy);
  border-bottom-color: var(--navy);
}

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--ink);
  padding: 0.4em 0.6em;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.75rem;
  color: var(--ink);
  cursor: pointer;
}

@media (max-width: 640px) {
  .nav-toggle { display: inline-block; }
  nav.primary-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 2px solid var(--ink);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem var(--edge) 1rem;
  }
  nav.primary-nav.open { display: flex; }
  nav.primary-nav a { padding: 0.6em 0; border-bottom: 1px solid rgba(26,26,26,0.12); }
  .site-header { position: sticky; }
  .site-header .corner-triangle--africa { width: 52px; height: 52px; background-size: 16px 16px; }
  .site-header .wrap { padding-right: calc(var(--edge) + 40px); }
}

/* ---------- page header block ---------- */

.page-head {
  padding: 3rem 0 0;
}
.page-head .intro {
  max-width: 60ch;
  color: var(--ink);
  opacity: 0.85;
}

main { min-height: 60vh; }

section { padding: 1rem 0 3.5rem; }

/* ---------- hero (home / about) ---------- */

.hero {
  padding: 3.4rem 0 1rem;
  position: relative;
}
.hero h1 { max-width: 16ch; }
.hero .lede {
  max-width: 62ch;
  font-size: 1.15rem;
  color: var(--ink);
  opacity: 0.85;
}
.statement {
  font-family: var(--font-serif);
  font-weight: 400;
  font-style: normal;
  font-size: clamp(1.5rem, 3.8vw, 2.15rem);
  line-height: 1.4;
  color: var(--ink);
  max-width: 42ch;
  margin: 0;
}

/* ---------- cards: publications ---------- */

.pub-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 2px solid var(--ink);
}
.pub-item {
  display: grid;
  grid-template-columns: 7.5rem 1fr auto;
  gap: 1.2rem;
  align-items: start;
  padding: 1.5rem 0;
  border-bottom: 1px solid rgba(26,26,26,0.18);
}
.pub-item .pub-date {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--navy);
  padding-top: 0.2rem;
}
.pub-item h3 { margin-bottom: 0.3em; }
.pub-item .pub-meta {
  font-family: var(--font-serif);
  font-size: 0.78rem;
  color: var(--ink);
  opacity: 0.65;
  margin-bottom: 0.6em;
}
.pub-item p.pub-desc { margin-bottom: 0.4em; color: var(--ink); opacity: 0.85; }
.pub-item .pub-action { white-space: nowrap; align-self: center; }

.btn {
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--paper);
  background: var(--ink);
  padding: 0.6em 1.1em;
  border: 2px solid var(--ink);
}
.btn:hover { background: var(--red); border-color: var(--red); color: var(--paper); }

@media (max-width: 560px) {
  .pub-item { grid-template-columns: 1fr; }
  .pub-item .pub-date { padding-top: 0; }
}

/* ---------- events ---------- */

.event-block {
  padding: 2rem 0;
  border-bottom: 1px solid rgba(26,26,26,0.18);
}
.event-block:first-child { border-top: 2px solid var(--ink); }
.event-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.3rem;
}
.event-head .event-date {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.78rem;
  color: var(--navy);
  white-space: nowrap;
}
.event-upcoming-tag {
  display: inline-block;
  background: var(--red);
  color: var(--paper);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.65rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15em 0.5em;
  margin-right: 0.4em;
}
.event-block .event-desc { max-width: 62ch; opacity: 0.85; }

.event-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}
.event-gallery img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid rgba(26,26,26,0.18);
  display: block;
  background: var(--paper-raised);
}
.event-gallery figure { margin: 0; }

/* ---------- announcements ---------- */

.announce-list { display: flex; flex-direction: column; gap: 1.1rem; }
.announce-item {
  border: 2px solid var(--ink);
  background: var(--paper-raised);
  padding: 1.3rem 1.4rem;
}
.announce-item .announce-top {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  align-items: baseline;
  flex-wrap: wrap;
}
.announce-item .announce-expiry {
  font-family: var(--font-serif);
  font-size: 0.7rem;
  color: var(--ink);
  opacity: 0.6;
  white-space: nowrap;
}
.announce-item h3 { margin-bottom: 0.4em; }
.announce-item p { margin-bottom: 0; opacity: 0.88; }

.empty-state {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.9rem;
  color: var(--ink);
  opacity: 0.55;
  padding: 2rem 0;
  border-top: 1px dashed rgba(26,26,26,0.3);
}

/* ---------- contact ---------- */

.contact-card {
  border: 2px solid var(--ink);
  padding: 2rem;
  max-width: 40ch;
  text-align: center;
  margin-top: 1.5rem;
}
.contact-card .eyebrow { text-align: center; }
.contact-card a {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.05rem;
  word-break: break-all;
}

/* ---------- footer ---------- */

footer.site-footer {
  border-top: 2px solid var(--ink);
  margin-top: 2rem;
  position: relative;
  overflow: hidden;
}
footer.site-footer .corner-triangle--china {
  width: 76px;
  height: 76px;
  background-size: 20px 20px;
}
footer.site-footer .wrap {
  padding: 1.8rem 0;
  padding-left: calc(var(--edge) + 60px);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-family: var(--font-serif);
  font-size: 0.75rem;
  color: var(--ink);
  opacity: 0.7;
  position: relative;
  z-index: 1;
}
footer.site-footer a { color: var(--ink); }

@media (max-width: 640px) {
  footer.site-footer .corner-triangle--china { width: 52px; height: 52px; background-size: 15px 15px; }
  footer.site-footer .wrap { padding-left: calc(var(--edge) + 40px); }
}