/* ============================================
   WAYNE FU PORTFOLIO — STYLESHEET
   ============================================ */

:root {
  --ink: #1a1814;
  --ink-light: #5a5650;
  --ink-faint: #9a9690;
  --paper: #f7f4ef;
  --paper-warm: #ede9e2;
  --accent: #b5432a;
  --accent-light: #e8c9c2;
  --border: #d8d4cd;
  --mono: 'IBM Plex Mono', monospace;
  --serif: 'Source Serif 4', Georgia, serif;
  --display: 'Playfair Display', 'Times New Roman', serif;
  --nav-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- TYPOGRAPHY ---- */
h1, h2, h3 { font-family: var(--display); font-weight: 700; line-height: 1.15; }
h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
h2 { font-size: clamp(1.4rem, 3vw, 2rem); }
h3 { font-size: 1.15rem; }
p { line-height: 1.75; color: var(--ink); }
a { color: var(--accent); text-decoration: none; transition: opacity 0.2s; }
a:hover { opacity: 0.7; }
em { font-style: italic; color: var(--accent); }
ul { list-style: none; }

/* ---- NAV ---- */
.nav {
  position: sticky; top: 0; z-index: 100;
  height: var(--nav-h);
  background: var(--paper);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem; gap: 2rem;
}

.nav-name a {
  font-family: var(--display);
  font-size: 1.1rem; color: var(--ink);
  font-weight: 700; letter-spacing: -0.01em;
}

.nav-links { display: flex; gap: 2rem; align-items: center; }
.nav-links > li { position: relative; }

.nav-links a, .nav-dropdown-label {
  font-family: var(--mono);
  font-size: 0.75rem; letter-spacing: 0.05em;
  color: var(--ink-light); text-transform: uppercase;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  cursor: pointer; user-select: none;
}

.nav-links a:hover, .nav-links a.active, .nav-dropdown-label.active {
  color: var(--ink); border-bottom-color: var(--accent); opacity: 1;
}

/* Dropdown */
.nav-dropdown { position: relative; }

.dropdown-menu {
  display: none; position: absolute;
  top: calc(100% + 18px); right: 0;
  background: var(--paper); border: 1px solid var(--border);
  min-width: 210px; box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  z-index: 200; flex-direction: column;
}

.dropdown-menu.open { display: flex; }

.dropdown-menu li a {
  display: block; padding: 0.75rem 1.25rem;
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.05em; text-transform: uppercase;
  color: var(--ink-light); transition: background 0.15s;
}
.dropdown-menu li:not(:last-child) a { border-bottom: 1px solid var(--border); }
.dropdown-menu li a:hover, .dropdown-menu li a.active {
  background: var(--paper-warm); color: var(--ink); opacity: 1;
}

.nav-toggle {
  display: none; background: none; border: none;
  font-size: 1.4rem; cursor: pointer; color: var(--ink);
}

/* ---- FOOTER ---- */
.footer {
  margin-top: auto; border-top: 1px solid var(--border);
  padding: 1.5rem 2.5rem;
  font-family: var(--mono); font-size: 0.72rem;
  color: var(--ink-faint); letter-spacing: 0.03em;
}
.footer a { color: var(--ink-faint); }
.footer a:hover { color: var(--accent); opacity: 1; }

/* ---- PAGE LAYOUTS ---- */
main { flex: 1; }

.page-inner { max-width: 860px; margin: 0 auto; padding: 4rem 2rem 6rem; }

.page-header {
  margin-bottom: 3.5rem; padding-bottom: 2rem;
  border-bottom: 1px solid var(--border);
}

.page-label {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); display: block; margin-bottom: 0.75rem;
}

.page-subtitle {
  margin-top: 0.75rem; font-size: 1.05rem;
  color: var(--ink-light); font-weight: 300;
}

/* ---- ABOUT / HERO ---- */
.page-about { max-width: 1100px; margin: 0 auto; padding: 0 2rem; }

.hero {
  display: grid; grid-template-columns: 1fr 260px;
  gap: 4rem; align-items: end;
  padding: 5rem 0 4rem;
  border-bottom: 1px solid var(--border);
}

.hero-label {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); display: block; margin-bottom: 1.25rem;
}

.hero-name {
  font-size: clamp(3rem, 7vw, 5.5rem);
  line-height: 1.0; letter-spacing: -0.02em; margin-bottom: 1.25rem;
}

.hero-title {
  font-family: var(--mono); font-size: 0.78rem;
  color: var(--ink-light); letter-spacing: 0.03em; line-height: 1.8;
}

/* ---- ABOUT BODY ---- */
.about-body {
  display: grid; grid-template-columns: 1fr 240px;
  gap: 5rem; padding: 4rem 0 3rem;
}

.about-bio h2 { font-size: 1.6rem; margin-bottom: 1.25rem; }
.about-bio p { margin-bottom: 1.25rem; font-size: 1.05rem; }

.info-block { margin-bottom: 2.25rem; }

.info-block h3 {
  font-family: var(--mono); font-size: 0.68rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 0.65rem; font-weight: 500;
}

.info-block li {
  font-size: 0.88rem; color: var(--ink-light);
  margin-bottom: 0.3rem; line-height: 1.6;
}

.info-block a { color: var(--ink-light); }
.info-block a:hover { color: var(--accent); opacity: 1; }

/* ---- HONORS STRIP ---- */
.honors-strip {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 0; border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 4rem;
}

.honor-item {
  padding: 1.75rem 1.5rem;
  border-right: 1px solid var(--border);
}
.honor-item:last-child { border-right: none; }

.honor-year {
  display: block; font-family: var(--mono);
  font-size: 0.7rem; letter-spacing: 0.1em;
  color: var(--accent); margin-bottom: 0.5rem;
}

.honor-item p {
  font-size: 0.85rem; color: var(--ink-light); line-height: 1.5;
}

/* ---- RESEARCH PAGE ---- */
.research-intro { margin-bottom: 3rem; }
.lead { font-size: 1.1rem; color: var(--ink-light); line-height: 1.85; max-width: 700px; }

.research-areas { display: flex; flex-direction: column; margin-bottom: 4rem; }

.research-card {
  display: grid; grid-template-columns: 80px 1fr;
  gap: 2rem; padding: 2.5rem 0;
  border-bottom: 1px solid var(--border);
}
.research-card:first-child { border-top: 1px solid var(--border); }

.card-number {
  font-family: var(--display); font-size: 2.5rem;
  color: var(--accent-light); font-weight: 700;
  line-height: 1; padding-top: 0.2rem;
}

.card-content h2 { font-size: 1.25rem; margin-bottom: 0.75rem; }
.card-content p { font-size: 0.95rem; color: var(--ink-light); margin-bottom: 1rem; }

.card-tags { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.card-tags span {
  font-family: var(--mono); font-size: 0.68rem;
  letter-spacing: 0.06em; padding: 0.25rem 0.6rem;
  background: var(--paper-warm); border: 1px solid var(--border);
  color: var(--ink-light); border-radius: 2px;
}

.research-collab {
  background: var(--paper-warm); border: 1px solid var(--border);
  padding: 2rem; border-radius: 2px;
}
.research-collab h2 { font-size: 1.2rem; margin-bottom: 0.75rem; }
.research-collab p { font-size: 0.95rem; }

/* ---- WORK PAGE ---- */
.work-section { margin-bottom: 4rem; }

.section-heading {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 1.5rem;
  padding-bottom: 0.75rem; border-bottom: 1px solid var(--border);
  font-weight: 500;
}

.project-card { padding: 1.75rem 0; border-bottom: 1px solid var(--border); }

.project-status {
  display: inline-block; font-family: var(--mono);
  font-size: 0.65rem; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); border: 1px solid var(--accent-light);
  padding: 0.2rem 0.5rem; margin-bottom: 0.75rem; border-radius: 2px;
}

.project-status.under-review { color: #6b7280; border-color: #d1d5db; }

.project-card h3 { font-size: 1.1rem; margin-bottom: 0.35rem; line-height: 1.35; }

.project-collab {
  font-size: 0.83rem; color: var(--ink-faint);
  font-family: var(--mono); margin-bottom: 0.65rem;
}

.project-links { margin-top: 0.75rem; display: flex; gap: 1.25rem; }
.project-links a { font-size: 0.83rem; font-family: var(--mono); }

/* Publications */
.pub-year-group {
  display: grid; grid-template-columns: 60px 1fr;
  gap: 2rem; margin-bottom: 0;
}

.pub-year {
  font-family: var(--mono); font-size: 0.82rem;
  color: var(--ink-faint); padding-top: 1.4rem;
  letter-spacing: 0.03em;
}

.pub-list { display: flex; flex-direction: column; }

.pub-entry {
  padding: 1.25rem 0; border-bottom: 1px solid var(--border);
}

.pub-title {
  font-family: var(--display); font-size: 1.02rem;
  font-weight: 700; margin-bottom: 0.3rem; line-height: 1.4;
}

.pub-meta { font-size: 0.87rem; color: var(--ink-light); margin-bottom: 0.2rem; }
.pub-venue { font-size: 0.85rem; color: var(--ink-faint); margin-bottom: 0.4rem; }

.pub-award {
  font-family: var(--mono); font-size: 0.68rem;
  color: var(--accent); margin: 0.35rem 0 0.5rem;
  line-height: 1.6;
}

.pub-links { display: flex; gap: 1rem; }
.pub-links a { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.05em; }

/* Talks */
.talks-group { margin-bottom: 2rem; }

.talks-subhead {
  font-family: var(--mono); font-size: 0.68rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 0.75rem; font-weight: 500;
}

.talk-list { display: flex; flex-direction: column; }

.talk-entry {
  display: grid; grid-template-columns: 75px 1fr;
  gap: 1.5rem; align-items: start;
  padding: 0.85rem 0; border-bottom: 1px solid var(--border);
}

.talk-date {
  font-family: var(--mono); font-size: 0.7rem;
  color: var(--ink-faint); letter-spacing: 0.04em;
  padding-top: 0.15rem;
}

.talk-title { font-size: 0.93rem; margin-bottom: 0.2rem; line-height: 1.4; }
.talk-venue { font-size: 0.82rem; color: var(--ink-faint); }
.talk-link { font-family: var(--mono); font-size: 0.72rem; white-space: nowrap; }

/* ---- TEACHING PAGE ---- */
.teaching-photo-wrap {
  margin-bottom: 0.5rem;
  border: 1px solid var(--border);
  overflow: hidden;
}

.teaching-photo {
  width: 100%; max-height: 420px;
  object-fit: cover; object-position: center 30%;
  display: block;
}

.teaching-photo-caption {
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.06em; color: var(--ink-faint);
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--paper-warm);
}

.teaching-interests {
  display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1rem;
}

.interest-pill {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.06em; padding: 0.4rem 0.9rem;
  background: var(--paper-warm); border: 1px solid var(--border);
  color: var(--ink-light); border-radius: 2px;
}

.course-card {
  padding: 1.75rem 0; border-bottom: 1px solid var(--border);
}
.course-card:first-of-type { border-top: 1px solid var(--border); }

.course-meta {
  display: flex; gap: 1rem; align-items: center;
  margin-bottom: 0.5rem; flex-wrap: wrap;
}

.course-code {
  font-family: var(--mono); font-size: 0.75rem;
  letter-spacing: 0.08em; color: var(--accent);
  font-weight: 500;
}

.course-inst {
  font-family: var(--mono); font-size: 0.7rem;
  color: var(--ink-faint); letter-spacing: 0.04em;
}

.course-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.course-card p { font-size: 0.93rem; color: var(--ink-light); }

.service-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 2.5rem 3rem;
}

.service-block h3 {
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); margin-bottom: 0.75rem; font-weight: 500;
}

.service-list { display: flex; flex-direction: column; gap: 0; }
.service-list li {
  font-size: 0.88rem; color: var(--ink-light);
  padding: 0.5rem 0; border-bottom: 1px solid var(--border);
  line-height: 1.5;
}

/* ---- JOURNAL PAGE ---- */
.journal-intro { margin-bottom: 2rem; }

.journal-filters {
  display: flex; gap: 0.5rem; align-items: center;
  flex-wrap: wrap; margin-bottom: 3rem;
  padding-bottom: 1.5rem; border-bottom: 1px solid var(--border);
}

.filter-label {
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); margin-right: 0.5rem;
}

.tag-btn {
  font-family: var(--mono); font-size: 0.7rem;
  letter-spacing: 0.06em; padding: 0.3rem 0.8rem;
  background: none; border: 1px solid var(--border);
  color: var(--ink-light); cursor: pointer;
  border-radius: 2px; transition: all 0.15s;
}
.tag-btn:hover, .tag-btn.active {
  background: var(--ink); color: var(--paper); border-color: var(--ink);
}

.journal-entries { display: flex; flex-direction: column; }

.journal-entry { padding: 3rem 0; border-bottom: 1px solid var(--border); }
.journal-entry:first-child { border-top: 1px solid var(--border); }

.entry-meta {
  display: flex; align-items: center; gap: 1rem;
  margin-bottom: 1rem; flex-wrap: wrap;
}

.entry-date {
  font-family: var(--mono); font-size: 0.72rem;
  color: var(--ink-faint); letter-spacing: 0.06em;
}

.entry-tags { display: flex; gap: 0.4rem; }
.entry-tags span {
  font-family: var(--mono); font-size: 0.62rem;
  letter-spacing: 0.06em; padding: 0.15rem 0.5rem;
  background: var(--accent-light); color: var(--accent); border-radius: 2px;
}

.entry-title { font-size: clamp(1.3rem, 3vw, 1.75rem); margin-bottom: 1.5rem; }

.entry-body p { margin-bottom: 1.1rem; font-size: 1rem; max-width: 680px; }
.entry-body h3 {
  font-family: var(--mono); font-size: 0.72rem;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--ink-faint); margin: 1.75rem 0 0.75rem; font-weight: 500;
}
.entry-body ul { list-style: none; padding-left: 0; max-width: 680px; }
.entry-body ul li {
  padding: 0.6rem 0 0.6rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.93rem; position: relative; line-height: 1.6;
}
.entry-body ul li::before {
  content: '—'; position: absolute; left: 0;
  color: var(--accent); font-family: var(--mono);
}

/* ---- MOBILE ---- */
@media (max-width: 800px) {
  .honors-strip { grid-template-columns: 1fr 1fr; }
  .service-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  .nav { padding: 0 1.25rem; }
  .nav-links {
    display: none; flex-direction: column;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--paper); border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem 1.5rem; gap: 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .dropdown-menu {
    position: static; display: none;
    box-shadow: none; border: none;
    border-left: 2px solid var(--border);
    padding-left: 1rem; margin-top: 0.5rem;
  }
  .dropdown-menu.open { display: flex; }
  .nav-dropdown-label { display: inline-block; }
  .hero { grid-template-columns: 1fr; padding: 2.5rem 0; }
  .hero-photo { display: none; }
  .about-body { grid-template-columns: 1fr; gap: 2rem; }
  .honors-strip { grid-template-columns: 1fr; }
  .honor-item { border-right: none; border-bottom: 1px solid var(--border); }
  .pub-year-group { grid-template-columns: 1fr; gap: 0; }
  .pub-year { padding-top: 1.25rem; padding-bottom: 0.25rem; }
  .talk-entry { grid-template-columns: 1fr; }
  .talk-date { display: none; }
  .page-inner { padding: 2.5rem 1.25rem 4rem; }
  .page-about { padding: 0 1.25rem; }
  .research-card { grid-template-columns: 1fr; gap: 0.5rem; }
  .card-number { font-size: 1.5rem; }
}