/* ==========================================================================
   Yufan Zhou · HKU CDS Academic Homepage
   Editorial Luxury + Spatial 3D Precision
   ========================================================================== */

:root {
  --bg: #f6f4ef;
  --bg-elevated: #fcfbf8;
  --bg-subtle: #ede9e0;
  --surface-glass: rgba(252, 251, 248, 0.82);

  --fg: #16181d;
  --fg-secondary: #4a4f5c;
  --fg-muted: #767b89;

  --border: rgba(22, 24, 29, 0.09);
  --border-strong: rgba(22, 24, 29, 0.18);

  --accent: #0f5f53;          /* HKU Emerald */
  --accent-soft: rgba(15, 95, 83, 0.09);
  --accent-border: rgba(15, 95, 83, 0.28);
  --gold: #9a7032;            /* Editorial Warm Bronze */
  --gold-soft: rgba(154, 112, 50, 0.11);

  --shadow-sm: 0 2px 10px rgba(18, 20, 26, 0.035);
  --shadow-md: 0 14px 36px rgba(18, 20, 26, 0.06);
  --shadow-lg: 0 24px 60px rgba(18, 20, 26, 0.09);

  --font-serif: "Cormorant Garamond", "Noto Serif SC", "Iowan Old Style", Georgia, serif;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --container: 1060px;
}

html[data-theme="dark"] {
  --bg: #0b0d11;
  --bg-elevated: #12161d;
  --bg-subtle: #191e28;
  --surface-glass: rgba(18, 22, 29, 0.82);

  --fg: #eceae4;
  --fg-secondary: #a8b0bf;
  --fg-muted: #6e7787;

  --border: rgba(236, 234, 228, 0.08);
  --border-strong: rgba(236, 234, 228, 0.18);

  --accent: #38b29a;
  --accent-soft: rgba(56, 178, 154, 0.12);
  --accent-border: rgba(56, 178, 154, 0.32);
  --gold: #d4a86a;
  --gold-soft: rgba(212, 168, 106, 0.14);

  --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 16px 40px rgba(0, 0, 0, 0.42);
  --shadow-lg: 0 28px 68px rgba(0, 0, 0, 0.55);
}

/* Base & Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
  overflow-x: hidden;
}

::selection {
  background: var(--accent-soft);
  color: var(--accent);
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

img {
  max-width: 100%;
  display: block;
}

/* Ambient 3D Spatial Backdrop */
.ambient-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.ambient-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 55% at 50% 12%, rgba(0, 0, 0, 0.42), transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 80% 55% at 50% 12%, rgba(0, 0, 0, 0.42), transparent 75%);
  opacity: 0.55;
}

.ambient-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.45;
}

.ambient-glow--1 {
  width: 520px;
  height: 520px;
  top: -180px;
  right: 8%;
  background: radial-gradient(circle, var(--accent-soft), transparent 70%);
}

.ambient-glow--2 {
  width: 460px;
  height: 460px;
  top: 220px;
  left: -120px;
  background: radial-gradient(circle, var(--gold-soft), transparent 70%);
}

/* Topbar Navigation */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: var(--surface-glass);
  border-bottom: 1px solid var(--border);
}

.topbar-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0.85rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--fg);
  color: var(--bg);
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.03em;
}

.brand-text {
  font-size: 0.95rem;
  color: var(--fg);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.15rem 0.48rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.nav-link {
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--fg-secondary);
  position: relative;
  padding: 0.2rem 0;
}

.nav-link:hover {
  color: var(--fg);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.cv-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  color: var(--fg);
  background: var(--bg-elevated);
}

.cv-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--bg-elevated);
  color: var(--fg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

html[data-theme="light"] .icon-moon {
  display: block;
}
html[data-theme="light"] .icon-sun {
  display: none;
}
html[data-theme="dark"] .icon-moon {
  display: none;
}
html[data-theme="dark"] .icon-sun {
  display: block;
}

/* Main Container */
.container {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: 4.25rem 2rem 5rem;
}

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero {
  display: grid;
  grid-template-columns: 1fr 295px;
  gap: 3.75rem;
  align-items: start;
  padding-bottom: 4rem;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-border);
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  margin-bottom: 1.25rem;
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.hero-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: clamp(2.75rem, 5vw, 3.85rem);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--fg);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.85rem;
}

.hero-cn {
  font-family: "Noto Serif SC", var(--font-serif);
  font-size: 1.55rem;
  font-weight: 500;
  color: var(--fg-muted);
  letter-spacing: 0.08em;
}

.hero-subtitle {
  margin: 0.9rem 0 1.4rem;
  font-size: 1.12rem;
  font-weight: 500;
  color: var(--fg-secondary);
}

.hero-subtitle a,
.hero-bio a,
.news-body a,
.timeline-col a {
  color: var(--fg);
  text-decoration: underline;
  text-decoration-color: var(--accent-border);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.hero-subtitle a:hover,
.hero-bio a:hover,
.news-body a:hover,
.timeline-col a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

.hero-bio p {
  margin: 0 0 0.95rem;
  color: var(--fg-secondary);
  font-size: 0.98rem;
  line-height: 1.78;
}

.hero-bio strong {
  color: var(--fg);
  font-weight: 600;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 1.65rem;
}

.social-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.44rem 0.85rem;
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--fg);
  box-shadow: var(--shadow-sm);
  transition: all 0.18s ease;
}

.social-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

.citation-pill {
  display: none;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.08rem 0.42rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.citation-pill.is-loaded {
  display: inline-block;
}

/* Portrait Frame */
.hero-visual {
  position: relative;
}

.portrait-frame {
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 0.75rem;
  box-shadow: var(--shadow-lg);
  transition: transform 0.3s ease;
}

.portrait-img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  object-position: center 18%;
  border-radius: calc(var(--radius-lg) - 6px);
  filter: contrast(1.02);
}

.portrait-caption {
  margin-top: 0.75rem;
  padding: 0.55rem 0.4rem 0.2rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
}

.caption-line {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.75rem;
}

.caption-label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--fg-muted);
}

.caption-val {
  font-weight: 500;
  color: var(--fg);
}

/* ==========================================================================
   SECTIONS & HEADERS
   ========================================================================== */
.section {
  padding-top: 4rem;
}

.section-header {
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin-bottom: 2rem;
}

.section-index {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.06em;
}

.section-title {
  margin: 0;
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--fg);
}

.section-rule {
  flex: 1;
  height: 1px;
  background: var(--border);
  align-self: center;
}

.section-note {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--fg-muted);
}

/* ==========================================================================
   RESEARCH PILLARS (3D & EMBODIED AI)
   ========================================================================== */
.pillars-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.pillar-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.pillar-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.pillar-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.pillar-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--gold);
  background: var(--gold-soft);
  padding: 0.18rem 0.52rem;
  border-radius: 4px;
}

.pillar-icon {
  color: var(--accent);
}

.pillar-title {
  margin: 0 0 0.6rem;
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--fg);
}

.pillar-desc {
  margin: 0 0 1.25rem;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--fg-secondary);
  flex: 1;
}

.pillar-keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
}

.pillar-keywords span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--fg-muted);
  background: var(--bg-subtle);
  padding: 0.18rem 0.5rem;
  border-radius: 4px;
}

/* ==========================================================================
   NEWS / HIGHLIGHTS
   ========================================================================== */
.news-list {
  list-style: none;
  margin: 0;
  padding: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  divide-y: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.news-item {
  display: grid;
  grid-template-columns: 95px 1fr;
  gap: 1.25rem;
  padding: 0.95rem 1.4rem;
  align-items: baseline;
  border-bottom: 1px solid var(--border);
  font-size: 0.92rem;
}

.news-item:last-child {
  border-bottom: none;
}

.news-item--featured {
  background: linear-gradient(90deg, var(--accent-soft), transparent 85%);
}

.news-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
  font-weight: 500;
}

.news-body {
  color: var(--fg-secondary);
}

.news-body strong {
  color: var(--fg);
  font-weight: 600;
}

.news-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.48rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--accent-border);
  margin-right: 0.45rem;
  vertical-align: middle;
}

/* ==========================================================================
   SELECTED PUBLICATIONS
   ========================================================================== */
.pub-list {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.pub-card {
  display: grid;
  grid-template-columns: 290px 1fr;
  gap: 1.75rem;
  padding: 1.4rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.22s ease, box-shadow 0.22s ease;
}

.pub-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.pub-media {
  position: relative;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  align-self: start;
}

.pub-venue-tag {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 0.22rem 0.58rem;
  border-radius: 5px;
  background: rgba(18, 22, 29, 0.84);
  color: #ffffff;
  backdrop-filter: blur(6px);
}

.pub-venue-tag--highlight {
  background: var(--accent);
  color: #ffffff;
}

.pub-thumb-link {
  display: block;
  overflow: hidden;
}

.pub-thumb {
  width: 100%;
  height: 185px;
  object-fit: cover;
  transition: transform 0.35s ease;
}

.pub-card:hover .pub-thumb {
  transform: scale(1.03);
}

.pub-content {
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.pub-domains {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.pub-domains span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--gold);
  background: var(--gold-soft);
  padding: 0.12rem 0.48rem;
  border-radius: 4px;
}

.pub-title {
  margin: 0 0 0.45rem;
  font-family: var(--font-serif);
  font-size: 1.42rem;
  font-weight: 600;
  line-height: 1.3;
  color: var(--fg);
}

.pub-title a:hover {
  color: var(--accent);
}

.pub-authors {
  margin: 0 0 0.65rem;
  font-size: 0.88rem;
  color: var(--fg-muted);
  line-height: 1.55;
}

.pub-authors .me {
  color: var(--fg);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

.pub-summary {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--fg-secondary);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.pub-btn {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 500;
  padding: 0.3rem 0.72rem;
  border-radius: 5px;
  border: 1px solid var(--border-strong);
  background: transparent;
  color: var(--fg);
  cursor: pointer;
  transition: all 0.15s ease;
}

.pub-btn:hover,
.pub-btn.is-active {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

.pub-btn--primary {
  background: var(--fg);
  color: var(--bg);
  border-color: var(--fg);
}

.pub-btn--primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.bibtex-box {
  margin: 0.85rem 0 0;
  padding: 0.85rem 1rem;
  background: var(--bg-subtle);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.55;
  color: var(--fg-secondary);
  overflow-x: auto;
}

/* ==========================================================================
   EDUCATION & RESEARCH EXPERIENCE TIMELINE
   ========================================================================== */
.dual-timeline {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

.col-label {
  margin: 0 0 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-muted);
}

.timeline {
  position: relative;
  border-left: 1px solid var(--border-strong);
  padding-left: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.85rem;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 2px solid var(--fg-muted);
}

.timeline-item--active::before {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.timeline-meta {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--accent);
  margin-bottom: 0.2rem;
}

.timeline-role {
  margin: 0 0 0.2rem;
  font-family: var(--font-serif);
  font-size: 1.26rem;
  font-weight: 600;
  color: var(--fg);
}

.timeline-org {
  margin: 0 0 0.4rem;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--fg-secondary);
}

.timeline-detail {
  margin: 0;
  font-size: 0.86rem;
  color: var(--fg-muted);
  line-height: 1.6;
}

/* ==========================================================================
   SELECTED PROJECTS & SURVEYS
   ========================================================================== */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.15rem;
}

.project-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.35rem 1.5rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

.project-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.project-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.55rem;
}

.project-type {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 0.15rem 0.5rem;
  border-radius: 4px;
}

.project-arrow {
  font-size: 0.95rem;
  color: var(--fg-muted);
  transition: transform 0.2s ease, color 0.2s ease;
}

.project-card:hover .project-arrow {
  transform: translate(2px, -2px);
  color: var(--accent);
}

.project-name {
  margin: 0 0 0.45rem;
  font-family: var(--font-serif);
  font-size: 1.28rem;
  font-weight: 600;
  color: var(--fg);
}

.project-desc {
  margin: 0;
  font-size: 0.87rem;
  color: var(--fg-secondary);
  line-height: 1.6;
}

/* ==========================================================================
   HONORS & AWARDS
   ========================================================================== */
.honors-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.honor-item {
  display: flex;
  gap: 1rem;
  align-items: baseline;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.honor-year {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--gold);
  background: var(--gold-soft);
  padding: 0.16rem 0.5rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.honor-name {
  margin: 0 0 0.18rem;
  font-size: 0.94rem;
  font-weight: 600;
  color: var(--fg);
}

.honor-org {
  margin: 0;
  font-size: 0.82rem;
  color: var(--fg-muted);
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 2.25rem 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.84rem;
  color: var(--fg-muted);
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.footer-name {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--fg);
}

.footer-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.footer-right a:hover {
  color: var(--accent);
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .hero-visual {
    max-width: 280px;
  }

  .pillars-grid {
    grid-template-columns: 1fr;
  }

  .pub-card {
    grid-template-columns: 1fr;
  }

  .pub-thumb {
    height: 210px;
  }

  .dual-timeline,
  .projects-grid,
  .honors-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .topbar-inner {
    padding: 0.75rem 1.25rem;
  }

  .nav {
    display: none;
  }

  .container {
    padding: 2.5rem 1.25rem 3.5rem;
  }

  .news-item {
    grid-template-columns: 1fr;
    gap: 0.25rem;
  }
}