/* ================================================================
   SAMUEL LEE JACKSON — Personal Site
   style.css
   ================================================================ */

/* ── Google Fonts ─────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@300;400&family=Spectral:ital,wght@0,300;0,400;0,500;0,600;1,300;1,400&family=Work+Sans:wght@300;400;500;600&display=swap');

/* ── Custom Properties ────────────────────────────────────────── */
:root {
  --ink:        #1C1C28;
  --ink-60:     rgba(28, 28, 40, 0.60);
  --ink-30:     rgba(28, 28, 40, 0.30);
  --ink-10:     rgba(28, 28, 40, 0.10);
  --bg:         #F3F0E8;
  --bg-dark:    #E8E4D8;
  --accent:     #C4521A;
  --accent-dim: rgba(196, 82, 26, 0.18);
  --navy:       #1E3A54;

  --f-serif:    'Spectral', Georgia, 'Times New Roman', serif;
  --f-sans:     'Work Sans', 'Helvetica Neue', Helvetica, sans-serif;
  --f-mono:     'IBM Plex Mono', 'Courier New', monospace;

  --nav-h:      58px;
  --max-w:      1040px;
  --gap:        clamp(1.25rem, 4vw, 3rem);
}

/* ── Reset ────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html  { font-size: 16px; scroll-behavior: smooth; }
body  {
  font-family: var(--f-serif);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img   { display: block; max-width: 100%; }
ul    { list-style: none; }
a     { color: inherit; text-decoration: none; }
button { cursor: pointer; font: inherit; }

/* ── Navigation ───────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: var(--bg);
  border-bottom: 1px solid var(--ink-10);
  transition: box-shadow 0.3s ease;
}
.site-nav.raised {
  box-shadow: 0 2px 24px rgba(28, 28, 40, 0.08);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  font-family: var(--f-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-brand:hover { color: var(--accent); }

/* Hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  background: none;
  border: none;
  flex-shrink: 0;
}
.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.28s ease, opacity 0.28s ease;
  transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Nav links */
.nav-links {
  display: flex;
  gap: 2rem;
}
.nav-links a {
  font-family: var(--f-sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-60);
  position: relative;
  padding-bottom: 2px;
  transition: color 0.2s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--ink); }
.nav-links a.active::after,
.nav-links a:hover::after { transform: scaleX(1); }

/* ── Page wrapper ─────────────────────────────────────────────── */
.wrap {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: clamp(2.5rem, 7vw, 5rem) var(--gap);
  animation: fadeUp 0.45s ease both;
}

/* ── Typography ───────────────────────────────────────────────── */
.page-h1 {
  font-family: var(--f-serif);
  font-weight: 300;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  letter-spacing: -0.025em;
  line-height: 1.15;
  color: var(--ink);
}
.page-desc {
  font-family: var(--f-sans);
  font-size: 0.86rem;
  color: var(--ink-60);
  margin-top: 0.6rem;
  margin-bottom: 2.5rem;
  line-height: 1.6;
}
p {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  margin-bottom: 1.15rem;
}
p:last-child { margin-bottom: 0; }
.lead {
  font-size: 1.05rem;
  line-height: 1.85;
}

/* Inline text links */
.text-link {
  color: var(--accent);
  border-bottom: 1px solid var(--accent-dim);
  transition: border-color 0.2s;
}
.text-link:hover { border-color: var(--accent); }

/* ── Section labels ───────────────────────────────────────────── */
.label {
  font-family: var(--f-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.label::before {
  content: '';
  display: block;
  width: 18px;
  height: 1px;
  background: var(--accent);
  flex-shrink: 0;
}
hr.rule {
  border: none;
  border-top: 1px solid var(--ink-10);
  margin: 2.5rem 0;
}

/* ── About layout ─────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: clamp(2.5rem, 5vw, 5rem);
  align-items: start;
}
.about-aside {
  position: sticky;
  top: calc(var(--nav-h) + 2rem);
}
.about-photo {
  width: 100%;
  height: auto;
  filter: grayscale(8%) contrast(1.03);
  border: 1px solid var(--bg-dark);
}
.about-identity { margin-top: 1.15rem; }
.about-name {
  font-family: var(--f-serif);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.about-role {
  font-family: var(--f-sans);
  font-size: 0.78rem;
  color: var(--ink-60);
  line-height: 1.5;
  margin-top: 0.2rem;
}
.about-org {
  font-family: var(--f-sans);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 0.1rem;
}
.contact-list {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.contact-list a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--f-sans);
  font-size: 0.74rem;
  color: var(--ink-60);
  transition: color 0.2s;
}
.contact-list a:hover { color: var(--accent); }
.contact-list .ci {
  width: 14px;
  font-size: 0.78rem;
  text-align: center;
  flex-shrink: 0;
  color: var(--ink-30);
  transition: color 0.2s;
}
.contact-list a:hover .ci { color: var(--accent); }

/* ── Entry list (education / awards) ─────────────────────────── */
.entry-list { margin-top: 0.2rem; }
.entry {
  display: grid;
  grid-template-columns: 1fr auto;
  column-gap: 1.25rem;
  row-gap: 0.15rem;
  padding: 0.9rem 0;
  border-bottom: 1px solid var(--ink-10);
  align-items: baseline;
}
.entry:last-child { border-bottom: none; }
.entry-name {
  font-family: var(--f-serif);
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--ink);
  grid-column: 1;
}
.entry-detail {
  font-family: var(--f-sans);
  font-size: 0.77rem;
  color: var(--ink-60);
  line-height: 1.55;
  grid-column: 1;
}
.entry-year {
  font-family: var(--f-mono);
  font-size: 0.7rem;
  color: var(--ink-30);
  white-space: nowrap;
  grid-column: 2;
  grid-row: 1;
  padding-top: 0.15rem;
}

/* ── Publications ─────────────────────────────────────────────── */
.pub-list { margin-top: 0.5rem; }
.pub-item {
  display: flex;
  gap: 1.25rem;
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--ink-10);
}
.pub-item:last-child { border-bottom: none; }
.pub-yr {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  color: var(--ink-30);
  min-width: 2.4rem;
  padding-top: 0.2rem;
  flex-shrink: 0;
}
.pub-body { flex: 1; }
.pub-title {
  font-family: var(--f-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
  line-height: 1.5;
  display: block;
  margin-bottom: 0.25rem;
}
.pub-authors {
  font-family: var(--f-sans);
  font-size: 0.78rem;
  color: var(--ink-60);
  line-height: 1.6;
  display: block;
  margin-bottom: 0.2rem;
}
.pub-authors strong { color: var(--ink); font-weight: 600; }
.pub-venue {
  font-family: var(--f-sans);
  font-size: 0.78rem;
  font-style: italic;
  color: var(--ink-60);
}
.pub-access {
  font-family: var(--f-mono);
  font-size: 0.68rem;
  color: var(--accent);
  margin-left: 0.6rem;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: opacity 0.2s;
}
.pub-access:hover { opacity: 0.65; }

/* ── Accordion ────────────────────────────────────────────────── */
.acc-section { margin-top: 2.5rem; }
.acc-section:first-child { margin-top: 0; }
.acc-group-label {
  font-family: var(--f-sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-30);
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--ink-10);
  margin-bottom: 0;
}
.acc-subgroup { margin-top: 1.5rem; }
.acc-subgroup-label {
  font-family: var(--f-sans);
  font-size: 0.73rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--ink-60);
  font-style: italic;
  padding: 0 0 0.6rem;
  display: block;
}
.acc-item { border-bottom: 1px solid var(--ink-10); }
.acc-trigger {
  width: 100%;
  background: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.9rem 0;
  text-align: left;
  gap: 1rem;
}
.acc-trigger-text {
  font-family: var(--f-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--ink);
  transition: color 0.2s;
}
.acc-trigger:hover .acc-trigger-text { color: var(--accent); }
.acc-icon {
  font-family: var(--f-mono);
  font-size: 1rem;
  font-weight: 300;
  color: var(--ink-30);
  line-height: 1;
  transition: transform 0.28s ease, color 0.2s;
  flex-shrink: 0;
  user-select: none;
}
.acc-trigger[aria-expanded="true"] .acc-icon {
  transform: rotate(45deg);
  color: var(--accent);
}
.acc-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s ease;
}
.acc-panel.open { grid-template-rows: 1fr; }
.acc-panel-inner { overflow: hidden; }
.acc-panel-inner p {
  font-family: var(--f-sans);
  font-size: 0.84rem;
  line-height: 1.72;
  color: var(--ink-60);
  padding-bottom: 1rem;
  margin-bottom: 0;
}

/* ── CV page ──────────────────────────────────────────────────── */
.cv-action {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--f-sans);
  font-size: 0.76rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  border: 1px solid var(--ink-10);
  padding: 0.45rem 0.9rem;
  margin-bottom: 1.5rem;
  transition: border-color 0.2s, color 0.2s;
}
.cv-action:hover { border-color: var(--accent); color: var(--accent); }
.cv-frame {
  border: 1px solid var(--ink-10);
}
.cv-frame object {
  display: block;
  width: 100%;
  height: 84vh;
  min-height: 560px;
}

/* ── Footer ───────────────────────────────────────────────────── */
.site-footer {
  margin-top: 5rem;
  padding: 1.75rem var(--gap);
  border-top: 1px solid var(--ink-10);
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.footer-copy {
  font-family: var(--f-sans);
  font-size: 0.73rem;
  color: var(--ink-30);
  margin: 0;
}
.footer-social {
  display: flex;
  gap: 1.5rem;
}
.footer-social a {
  font-family: var(--f-sans);
  font-size: 0.73rem;
  color: var(--ink-30);
  transition: color 0.2s;
}
.footer-social a:hover { color: var(--accent); }

/* ── Back to top ──────────────────────────────────────────────── */
#back-top {
  position: fixed;
  bottom: 1.75rem;
  right: 1.75rem;
  width: 36px;
  height: 36px;
  background: var(--navy);
  color: var(--bg);
  border: none;
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 150;
  opacity: 0.85;
  transition: background 0.2s, opacity 0.2s;
}
#back-top.visible { display: flex; }
#back-top:hover   { background: var(--accent); opacity: 1; }

/* ── Animations ───────────────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeUp 0.5s ease both; }
.fade-in-2 { animation: fadeUp 0.5s 0.1s ease both; }
.fade-in-3 { animation: fadeUp 0.5s 0.2s ease both; }

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 760px) {
  /* Hamburger menu */
  .nav-toggle { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--ink-10);
    flex-direction: column;
    gap: 0;
    box-shadow: 0 8px 24px rgba(28,28,40,0.07);
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 0.8rem var(--gap);
    font-size: 0.82rem;
  }
  .nav-links a::after { display: none; }

  /* About layout */
  .about-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .about-aside {
    position: static;
    display: flex;
    gap: 1.25rem;
    align-items: flex-start;
  }
  .about-photo {
    width: 110px;
    flex-shrink: 0;
  }
  .about-identity { margin-top: 0; }

  /* Entry list */
  .entry { grid-template-columns: 1fr; gap: 0.1rem; }
  .entry-year { grid-column: 1; grid-row: auto; }

  /* Pubs */
  .pub-item { flex-direction: column; gap: 0.25rem; }
  .pub-yr { min-width: auto; }
}

@media (max-width: 460px) {
  .about-aside { flex-direction: column; }
  .about-photo { width: 130px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}