/* ============================================================
   Layout — Page sections, Lab grid, Timeline, Bio
   ============================================================ */

#site-canvas-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1 !important;
  pointer-events: none;
}

/* === Hero === */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: transparent;
}

.hero__bg-gradient {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 50% 80%, rgba(16,163,127,0.04) 0%, transparent 60%),
              radial-gradient(ellipse at 20% 20%, rgba(201,169,110,0.03) 0%, transparent 40%);
  z-index: 1;
}

#hero-canvas-container {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

.hero__watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  opacity: 0.03;
  pointer-events: none;
}

.hero__watermark img {
  width: 60vmin;
  height: auto;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: var(--space-5xl) var(--gutter);
  max-width: 800px;
}

.hero__tag {
  margin-bottom: var(--space-xl);
}

.hero__title {
  font-size: var(--text-display);
  line-height: 1.05;
  margin-bottom: var(--space-lg);
}

.hero__dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 50%;
  vertical-align: middle;
  margin-left: 4px;
  animation: pulse 3s var(--ease-in-out) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero__zh {
  font-size: 0.4em;
  color: var(--fg-muted);
  letter-spacing: 0.2em;
  display: block;
  margin-top: var(--space-sm);
}

.hero__subtitle {
  font-size: var(--text-body-lg);
  color: var(--fg-secondary);
  max-width: 55ch;
  margin: 0 auto var(--space-2xl);
  line-height: 1.7;
}

.hero__cta {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
  flex-wrap: wrap;
}

.hero__scroll-indicator {
  position: fixed;
  bottom: var(--space-3xl);
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--fg-muted), transparent);
  animation: scrollBounce 2s var(--ease-in-out) infinite;
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.5; }
  50% { transform: translateY(10px); opacity: 1; }
}

/* === Work Filters === */
.work-filters {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}

.filter-btn {
  font-family: var(--font-body);
  font-size: var(--text-small);
  font-weight: 500;
  padding: 6px 16px;
  border-radius: var(--radius-full);
  color: var(--fg-muted);
  transition: all var(--duration-fast) var(--ease-out);
}

.filter-btn:hover {
  color: var(--fg);
}

.filter-btn.active {
  background: var(--surface);
  color: var(--fg);
}

/* === Lab Section === */
.lab-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
}

.lab-category--full {
  grid-column: 1 / -1;
}

.lab-category__title {
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-sm);
  border-bottom: 1px solid var(--border-subtle);
}

.lab-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.lab-cards--research {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}

.lab-card {
  display: flex;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  transition: all var(--duration-normal) var(--ease-out);
  text-decoration: none;
  color: inherit;
}

.lab-card:hover {
  border-color: var(--border);
  background: var(--surface-alt);
  transform: translateY(-2px);
}

.lab-card--wide {
  grid-column: 1 / -1;
}

.lab-card__icon {
  font-size: 24px;
  color: var(--fg-muted);
  flex-shrink: 0;
  width: 40px;
  text-align: center;
  padding-top: 2px;
  transition: color var(--duration-normal) var(--ease-out);
}

.lab-card:hover .lab-card__icon {
  color: var(--accent);
}

.lab-card__content {
  flex: 1;
  min-width: 0;
}

.lab-card__title {
  font-size: var(--text-h3);
  margin-bottom: var(--space-xs);
}

.lab-card__desc {
  margin-bottom: var(--space-sm);
}

.lab-card__tag {
  font-size: var(--text-caption);
  color: var(--fg-muted);
}

/* === Timeline === */
.timeline {
  position: relative;
  padding-left: var(--space-3xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 23px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding: var(--space-lg) 0;
  border-bottom: 1px solid var(--border-subtle);
}

.timeline__item:last-child {
  border-bottom: none;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--space-3xl) + 18px);
  top: var(--space-lg);
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--border);
  z-index: 1;
  transition: all var(--duration-normal) var(--ease-out);
}

.timeline__item:hover::before {
  border-color: var(--accent);
}

.timeline__item--major::before {
  background: var(--warm);
  border-color: var(--warm);
}

.timeline__item--major:hover::before {
  transform: scale(1.25);
  box-shadow: 0 0 8px var(--warm);
}

.timeline__year {
  font-size: var(--text-caption);
  color: var(--fg-muted);
  margin-bottom: var(--space-xs);
  font-family: var(--font-mono);
}

.timeline__title {
  font-size: var(--text-h3);
  margin-bottom: var(--space-xs);
  transition: color var(--duration-fast);
}

.timeline__item:hover .timeline__title {
  color: var(--fg);
}

.timeline__venue {
  font-size: var(--text-small);
  margin-bottom: var(--space-xs);
  color: var(--fg-secondary);
}

.timeline__type {
  display: inline-block;
  padding: 2px 8px;
  background: var(--surface);
  color: var(--fg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-family: var(--font-mono);
  transition: all var(--duration-fast);
}

.timeline__item--major .timeline__type {
  background: rgba(201, 169, 110, 0.06);
  color: var(--warm);
  border-color: rgba(201, 169, 110, 0.25);
}

/* === Bio Section === */
.bio-grid {
  display: grid;
  grid-template-columns: 1fr 1.8fr;
  gap: var(--space-3xl);
  align-items: start;
}

.bio__portrait {
  width: 100%;
  aspect-ratio: 3/4;
  background: var(--surface);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.bio__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.bio__name {
  margin-bottom: var(--space-xl);
}

.bio__text {
  margin-bottom: var(--space-2xl);
}

.bio__text p {
  max-width: 65ch;
  margin-bottom: var(--space-md);
  line-height: 1.7;
  color: var(--fg-secondary);
}

.bio__social {
  display: flex;
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.social-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-small);
  color: var(--fg-secondary);
  transition: color var(--duration-fast);
}

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

.social-link__icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--surface);
  border-radius: var(--radius-full);
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--fg-muted);
}

.bio__downloads {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.bio__contact {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--border);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .lab-grid {
    grid-template-columns: 1fr;
  }
  .lab-cards--research {
    grid-template-columns: 1fr;
  }
  .lab-card--wide {
    grid-column: auto;
  }
}

@media (max-width: 768px) {
  .bio-grid {
    grid-template-columns: 1fr;
  }
  .bio__portrait {
    max-width: 300px;
    margin: 0 auto;
  }
  .timeline {
    padding-left: var(--space-2xl);
  }
  .hero__title {
    font-size: clamp(32px, 8vw, 56px);
  }
  .hero__cta {
    flex-direction: column;
    align-items: center;
  }
}

@media (max-width: 480px) {
  .lab-card {
    flex-direction: column;
    gap: var(--space-md);
  }
  .lab-card__icon {
    width: auto;
  }
}

/* === News Section === */
.news-feature {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.news-card {
  position: relative;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-3xl);
  background: var(--surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  overflow: hidden;
  transition: border-color var(--duration-normal) var(--ease-out),
              background-color var(--duration-normal) var(--ease-out);
}

.news-card:hover {
  border-color: var(--border);
  background-color: var(--surface-alt);
}

.news-card__badge {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  font-size: var(--text-caption);
  padding: 4px 10px;
  background: var(--accent-muted);
  border: 1px solid var(--accent);
  border-radius: var(--radius-full);
}

.news-card__content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  justify-content: center;
}

.news-card__date {
  font-size: var(--text-caption);
  color: var(--fg-muted);
}

.news-card__title {
  margin-top: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.news-card__venue {
  font-size: var(--text-small);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.news-card__desc p {
  margin-bottom: var(--space-sm);
  color: var(--fg-secondary);
  line-height: 1.7;
}

.news-card__desc p:last-child {
  margin-bottom: 0;
}

.news-card__left-col {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 100%;
  gap: var(--space-lg);
}

.news-card__thumbnails {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-md);
  width: 100%;
}

.news-card__thumb {
  width: 100%;
  aspect-ratio: 1.5;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              transform var(--duration-normal) var(--ease-out);
}

.news-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-card__thumb:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  border-color: var(--fg-secondary);
}

.news-card__thumb.active {
  border-color: var(--accent);
  opacity: 1;
}

.news-card__right-col {
  display: flex;
  align-items: stretch;
  width: 100%;
  height: 100%;
}

.news-card__img-main-wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 380px;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
  background: var(--bg);
}

.news-card__img-main-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.news-card__img-caption {
  display: block;
  font-size: var(--text-caption);
  color: var(--fg-muted);
  text-align: center;
  margin-top: var(--space-xs);
}

/* Responsive News Section */
@media (max-width: 1024px) {
  .news-card {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}

@media (max-width: 768px) {
  .news-card__badge {
    position: static;
    display: inline-block;
    align-self: flex-start;
    margin-bottom: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .news-card {
    padding: var(--space-md);
  }
}

/* ============================================================
   Animations & Transitions (Scroll Reveal, Stagger, Loading)
   ============================================================ */

/* 1. Page-load Staggering (Hero entrance) */
.nav {
  transform: translateY(-100%);
  transition: background-color var(--duration-slow) var(--ease-out),
              border-bottom-color var(--duration-slow) var(--ease-out),
              transform 1.2s var(--ease-out) !important;
}

.hero__tag,
.hero__title,
.hero__subtitle,
.hero__cta {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1.2s var(--ease-out), transform 1.2s var(--ease-out);
}

.hero__scroll-indicator {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  transition: opacity 1.2s var(--ease-out), transform 1.2s var(--ease-out);
}

/* Active states when body has .page-loaded */
body.page-loaded .nav {
  transform: translateY(0);
}

body.page-loaded .hero__tag {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.15s;
}

body.page-loaded .hero__title {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.3s;
}

body.page-loaded .hero__subtitle {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.45s;
}

body.page-loaded .hero__cta {
  opacity: 1;
  transform: translateY(0);
  transition-delay: 0.6s;
}

body.page-loaded .hero__scroll-indicator {
  opacity: 0.6;
  transform: translateX(-50%) translateY(0);
  transition-delay: 0.75s;
}

/* 2. Scroll Reveal Observer Styles */
.scroll-reveal {
  opacity: 0;
  transform: translateY(25px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
  will-change: transform, opacity;
}

.scroll-reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered entry for columns/grids */
.scroll-reveal-stagger > * {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
  will-change: transform, opacity;
}

.scroll-reveal-stagger.revealed > * {
  opacity: 1;
  transform: translateY(0);
}

.scroll-reveal-stagger.revealed > *:nth-child(1) { transition-delay: 0.05s; }
.scroll-reveal-stagger.revealed > *:nth-child(2) { transition-delay: 0.1s; }
.scroll-reveal-stagger.revealed > *:nth-child(3) { transition-delay: 0.15s; }
.scroll-reveal-stagger.revealed > *:nth-child(4) { transition-delay: 0.2s; }
.scroll-reveal-stagger.revealed > *:nth-child(5) { transition-delay: 0.25s; }
.scroll-reveal-stagger.revealed > *:nth-child(6) { transition-delay: 0.3s; }
.scroll-reveal-stagger.revealed > *:nth-child(7) { transition-delay: 0.35s; }
.scroll-reveal-stagger.revealed > *:nth-child(8) { transition-delay: 0.4s; }

/* 3. Progressive Image Loading (Fade-in on load) */
img.lazy-load {
  opacity: 0;
  transition: opacity 0.8s var(--ease-out);
  will-change: opacity;
}

img.lazy-load.loaded {
  opacity: 1;
}