/* ==========================================================================
   Serene Ho — academic site
   Design concept: "customs ledger" — pale ledger paper, ink + stamp colors,
   numbered entries, hairline rules. The bar mark (varying heights) echoes
   the dissertation's core idea: firms are heterogeneous, not a uniform bloc.
   ========================================================================== */

:root {
  --paper: #EFEAE0;
  --paper-deep: #E4DCC8;
  --card: #F7F4EC;
  --ink: #20242B;
  --ink-soft: #565248;
  --ink-faint: #8A8272;
  --indigo: #2E3F6E;
  --indigo-soft: #5A6C9C;
  --ochre: #A8752A;
  --rule: #D6CEB8;
  --rule-strong: #B9AF94;

  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Public Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw: 880px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--indigo);
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
}
a:hover { color: var(--ochre); }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--ochre);
  outline-offset: 3px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--ink);
  line-height: 1.15;
  margin: 0 0 0.5em;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 28px;
}

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: 1px solid var(--rule);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.brand:hover { color: var(--ink); }
.brand .mark rect { transition: none; }

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--ink);
  border-bottom-color: var(--ochre);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 4px;
  padding: 6px 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink);
  cursor: pointer;
}

@media (max-width: 640px) {
  .nav-toggle { display: block; }
  .nav-links {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    flex-direction: column;
    gap: 0;
    padding: 8px 28px 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links li { border-top: 1px solid var(--rule); }
  .nav-links a { display: block; padding: 12px 0; }
}

/* ---------- hero ---------- */

.hero {
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--rule);
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: start;
}

.eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  color: var(--ochre);
  margin: 0 0 14px;
}

.hero h1 {
  font-size: clamp(2.1rem, 4vw, 2.9rem);
  margin-bottom: 0.2em;
}

.hero .role {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 22px;
}
.hero .role .sep { color: var(--rule-strong); margin: 0 8px; }

.hero .lede {
  max-width: 60ch;
  font-size: 1.05rem;
  color: var(--ink-soft);
}

.portrait {
  width: 168px;
  height: 168px;
  border-radius: 4px;
  border: 1px solid var(--rule-strong);
  overflow: hidden;
  background: var(--card);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; display: block; }

@media (max-width: 640px) {
  .hero .container { grid-template-columns: 1fr; }
  .portrait { width: 120px; height: 120px; order: -1; }
}

/* ---------- prose sections ---------- */

.section {
  padding: 44px 0;
  border-bottom: 1px solid var(--rule);
}
.section:last-of-type { border-bottom: none; }

.section h2 {
  font-size: 1.05rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}
.section h2::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
}

.prose p { margin: 0 0 1.1em; max-width: 68ch; }
.prose p:last-child { margin-bottom: 0; }

/* ---------- ledger entries (research/papers) ---------- */

.entry {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 20px;
  padding: 26px 0;
  border-top: 1px solid var(--rule);
}
.entry:first-child { border-top: none; padding-top: 4px; }

.entry-no {
  font-family: var(--font-mono);
  color: var(--ink-faint);
  font-size: 0.95rem;
  padding-top: 4px;
}

.entry-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin: 0 0 8px;
}

.entry-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 3px 9px;
  border-radius: 2px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-soft);
  white-space: nowrap;
}
.tag.status-jmp { background: var(--indigo); border-color: var(--indigo); color: var(--paper); }
.tag.status-wip { background: transparent; color: var(--ochre); border-color: var(--ochre); }

.entry p { max-width: 66ch; color: var(--ink-soft); margin: 0 0 10px; }

.data-tags {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

@media (max-width: 640px) {
  .entry { grid-template-columns: 1fr; }
  .entry-no { padding-top: 0; }
}

/* ---------- placeholder callouts (things Serene needs to fill in) ---------- */

.todo {
  border: 1px dashed var(--rule-strong);
  background: var(--card);
  border-radius: 4px;
  padding: 14px 16px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin: 14px 0;
}
.todo strong { color: var(--ochre); }

/* ---------- buttons / links list ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 10px 18px;
  border: 1px solid var(--ink);
  border-radius: 3px;
  color: var(--ink);
  text-decoration: none;
}
.btn:hover { background: var(--ink); color: var(--paper); }

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 18px;
}
.contact-row a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-decoration: none;
  border-bottom: 1px solid var(--rule-strong);
  padding-bottom: 2px;
}
.contact-row a:hover { color: var(--ochre); border-color: var(--ochre); }
.contact-row svg { width: 15px; height: 15px; stroke: currentColor; fill: none; }

/* ---------- simple table (CV / teaching) ---------- */

table.ledger {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
  margin: 18px 0;
}
table.ledger th, table.ledger td {
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--rule);
}
table.ledger th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  font-weight: 500;
}
table.ledger td.mono { font-family: var(--font-mono); font-size: 0.85rem; color: var(--ink-soft); }

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

.site-footer {
  padding: 36px 0 60px;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 0.78rem;
}