/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary: #2b2d3c;
  --primary-light: #ec5566;
  --accent: #ec5566;
  --accent-strong: #d83f50;
  --accent-soft: #ffe4e7;
  --care: #23b2a4;
  --care-soft: #d9f4f0;
  --text: #3b3d49;
  --text-light: #8a8d9b;
  --text-muted: #8a8d9b;
  --bg: #ffffff;
  --bg-alt: #f6f7fb;
  --card: #ffffff;
  --border: #ebecf3;
  --shadow: 0 2px 12px rgba(43,45,60,0.06);
  --shadow-md: 0 14px 34px rgba(43,45,60,0.12);
  --radius: 16px;
  --font-head: 'Quicksand', 'Nunito Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: 'Nunito Sans', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  font-size: 16px;
}

h1, h2, h3, h4,
.nav-name,
.pub-year,
.project-category,
.resume-subtitle {
  font-family: var(--font-head);
  letter-spacing: -0.01em;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--primary);
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Navigation ===== */
#navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

#navbar.scrolled {
  box-shadow: var(--shadow-md);
}

.nav-container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

.nav-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--primary);
}

.nav-name:hover {
  color: var(--primary);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.2rem;
  color: var(--text);
  cursor: pointer;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 32px;
}

.nav-links a {
  color: var(--text-light);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
}

/* ===== Hero ===== */
#hero {
  padding: 130px 24px 70px;
  background: linear-gradient(100deg, rgba(255, 255, 255, 0.94) 0%, rgba(255, 255, 255, 0.82) 42%, rgba(255, 246, 247, 0.45) 72%, rgba(255, 244, 245, 0.18) 100%),
    url("background/baymax_v3.png") 88% 18% / cover no-repeat;
  background-color: #fdf6f6;
  border-bottom: 1px solid var(--border);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 48px;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 168px;
  height: 168px;
  border-radius: 50%;
  object-fit: cover;
  border: 5px solid #ffffff;
  box-shadow: 0 14px 34px rgba(43,45,60,0.16), 0 0 0 2px var(--accent-soft);
}

.hero-text h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 4px;
}

.hero-text .title {
  font-size: 1.15rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 4px;
  min-height: 1.5em;
}

.typing-cursor {
  animation: blink 0.8s step-end infinite;
  font-weight: 300;
  color: var(--accent);
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-text .affiliation {
  font-size: 1rem;
  color: var(--text);
  margin-bottom: 2px;
}

.hero-text .prev-affiliation {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-bottom: 16px;
}

.hero-links {
  display: flex;
  gap: 16px;
}

.hero-links a {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  font-size: 1.1rem;
  box-shadow: 0 6px 16px rgba(236,85,102,0.30);
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
}

.hero-links a:hover {
  background: var(--accent-strong);
  transform: translateY(-3px);
  color: white;
  box-shadow: 0 10px 22px rgba(236,85,102,0.40);
}

/* ===== Sections ===== */
section {
  padding: 64px 0;
}

section:nth-child(odd) {
  background: var(--bg-alt);
}

/* ===== Baymax silhouette motifs ===== */
#awards,
#contact {
  position: relative;
  overflow: hidden;
}

#awards > .container,
#contact > .container {
  position: relative;
  z-index: 1;
}

#awards::after,
#contact::after {
  content: "";
  position: absolute;
  background: url("baymax-silhouette.svg") center / contain no-repeat;
  pointer-events: none;
  z-index: 0;
}

#awards::after {
  width: 260px;
  height: 350px;
  left: -64px;
  bottom: -48px;
  opacity: 0.045;
  transform: rotate(-9deg) scaleX(-1);
}

#contact::after {
  width: 240px;
  height: 320px;
  right: -52px;
  top: -40px;
  opacity: 0.04;
  transform: rotate(-6deg);
}

section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 3px solid var(--accent);
  display: inline-block;
}

/* ===== About ===== */
.about-content {
  display: flex;
  align-items: center;
  gap: 40px;
}

.about-text {
  flex: 1;
}

.about-content p {
  margin-bottom: 16px;
  color: var(--text);
}

.about-mascot {
  flex-shrink: 0;
  width: 190px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.about-mascot::before {
  content: "";
  position: absolute;
  inset: 8% 0 4% 0;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 45%, var(--accent-soft) 0%, rgba(255,228,231,0.35) 45%, rgba(255,228,231,0) 72%);
  z-index: 0;
}

.about-mascot img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  filter: drop-shadow(0 14px 22px rgba(43,45,60,0.16));
  animation: mascot-float 4.5s ease-in-out infinite;
}

@keyframes mascot-float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

/* ===== Publications ===== */
.pub-year {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
  margin-top: 8px;
}

.pub-item {
  display: flex;
  gap: 16px;
  padding: 20px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 16px;
  transition: box-shadow 0.2s;
}

.pub-item:hover {
  box-shadow: var(--shadow-md);
}

.pub-item.has-thumb {
  flex-direction: row;
  align-items: center;
  gap: 20px;
}

.pub-thumb {
  flex-shrink: 0;
  width: 280px;
  border-radius: 12px;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid var(--border);
  line-height: 0;
  font-size: 0;
  align-self: stretch;
  display: flex;
  align-items: center;
  justify-content: center;
}

.pub-thumb--small {
  width: 140px;
}

.pub-thumb--wide {
  width: 360px;
}

.pub-item.has-thumb.pub-item--banner {
  flex-direction: column;
  align-items: stretch;
  gap: 16px;
}

.pub-item--banner .pub-thumb {
  width: 100%;
}

.pub-thumb img,
.pub-thumb video {
  width: 100%;
  height: auto;
  display: block;
  vertical-align: bottom;
}

.venue-tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  white-space: nowrap;
}

a.venue-tag {
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

a.venue-tag:hover {
  opacity: 0.88;
  transform: translateY(-1px);
}

.venue-tag.aaai {
  background: #fef3c7;
  color: #92400e;
}

.venue-tag.cvpr {
  background: #dbeafe;
  color: #1e40af;
}

.venue-tag.ieie {
  background: #d1fae5;
  color: #065f46;
}

.venue-tag.miccai {
  background: #ede9fe;
  color: #5b21b6;
}

.venue-tag.neurips {
  background: #e0f2fe;
  color: #075985;
}

.venue-tag.arxiv {
  background: #fee2e2;
  color: #b31b1b;
}

.venue-tag.other {
  background: #e2e8f0;
  color: #475569;
}

.pub-details h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 3px;
  line-height: 1.3;
}

.pub-authors {
  font-size: 0.83rem;
  color: var(--text-light);
  margin-bottom: 3px;
}

.pub-venue-text {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-bottom: 6px;
}

.pub-status {
  font-style: italic;
  color: var(--accent);
}

.pub-links {
  display: flex;
  gap: 12px;
}

.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 0.82rem;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 999px;
  background: var(--bg-alt);
  color: var(--accent);
  border: 1px solid var(--border);
  transition: all 0.2s;
}

.pub-links a:hover {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ===== Resume ===== */
.resume-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.resume-subtitle {
  font-size: 1.15rem;
  margin-bottom: 1.2rem;
  padding-left: 1.5rem;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.resume-subtitle i {
  font-size: 1rem;
}

.resume-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 0;
  padding: 0 0 1.5rem 1.5rem;
  position: relative;
  border-left: 2px solid rgba(236, 85, 102, 0.22);
}

.resume-item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.resume-dot {
  position: absolute;
  left: -6px;
  top: 4px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--care);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 2px var(--care);
  flex-shrink: 0;
}

.resume-content h4 {
  font-size: 1.05rem;
  margin-bottom: 0.15rem;
}

.resume-org {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.resume-org a {
  color: var(--accent);
  text-decoration: none;
}

.resume-org a:hover {
  text-decoration: underline;
}

.resume-date {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.resume-lab {
  font-size: 0.85rem;
}

.resume-lab a {
  color: var(--accent);
  text-decoration: none;
}

.resume-lab a:hover {
  text-decoration: underline;
}

/* ===== Awards ===== */
.awards-list {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}

.award-item {
  display: flex;
  align-items: flex-start;
  gap: 1.5rem;
  padding: 1rem 1.2rem;
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.award-item:hover {
  transform: translateY(-2px);
}

.award-year {
  flex-shrink: 0;
  font-weight: 700;
  font-size: 1rem;
  color: var(--accent);
  min-width: 48px;
  padding-top: 2px;
}

.award-details h3 {
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.award-details p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* ===== Media ===== */
.media-row {
  display: flex;
  gap: 16px;
  align-items: stretch;
  max-width: 700px;
}

.media-video {
  flex: 1;
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 16 / 9;
}

.media-video iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.media-article {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0;
  padding: 0;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  color: var(--text);
  overflow: hidden;
  transition: box-shadow 0.2s, background 0.2s;
}

.media-article:hover {
  background: var(--bg-alt);
  box-shadow: var(--shadow-md);
  color: var(--text);
}

.media-article-img {
  width: 100%;
  border-radius: 6px 6px 0 0;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.media-article-text {
  padding: 12px;
}

.media-article-text h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 2px;
}

.media-source {
  font-size: 0.78rem;
  color: var(--text-light);
}

/* ===== Projects ===== */
#projects {
  position: relative;
  overflow: hidden;
}

#projects > .container {
  position: relative;
  z-index: 1;
}

.section-mascot {
  position: absolute;
  pointer-events: none;
  z-index: 0;
}

.section-mascot--fly {
  width: 150px;
  height: auto;
  top: 40px;
  right: -10px;
  filter: drop-shadow(0 14px 22px rgba(43,45,60,0.16));
  animation: mascot-float 5s ease-in-out infinite;
}

.project-category {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 16px;
  margin-top: 8px;
}

.project-category:not(:first-of-type) {
  margin-top: 32px;
}

.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.project-card {
  display: block;
  padding: 24px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  transition: all 0.2s;
  color: var(--text);
}

.project-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  border-color: var(--accent);
  color: var(--text);
}

.project-icon {
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--accent-soft) 0%, var(--care-soft) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 14px;
  font-size: 1.2rem;
  color: var(--accent);
}

.project-card h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 6px;
}

.project-card p {
  font-size: 0.85rem;
  color: var(--text-light);
  line-height: 1.5;
  margin-bottom: 12px;
}

.project-meta {
  display: flex;
  gap: 14px;
  font-size: 0.8rem;
  color: var(--text-light);
}

.project-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

.project-meta i {
  font-size: 0.75rem;
}

/* ===== Contact ===== */
.contact-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.contact-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-map {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 24px;
  background: white;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.contact-item > i {
  font-size: 1.3rem;
  color: var(--accent);
  margin-top: 2px;
}

.contact-item h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 4px;
}

.contact-item p {
  font-size: 0.88rem;
  color: var(--text-light);
}

.contact-item a {
  color: var(--accent);
}

/* ===== Back to Top ===== */
#back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
  box-shadow: 0 8px 20px rgba(236, 85, 102, 0.38);
  z-index: 999;
}

#back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

#back-to-top:hover {
  transform: translateY(-3px);
}

/* ===== Footer ===== */
footer {
  padding: 24px 0;
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.footer-social {
  display: flex;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 0.8rem;
}

.footer-social a {
  color: var(--text-light);
  font-size: 1.2rem;
  transition: color 0.2s, transform 0.2s;
}

.footer-social a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

footer p {
  font-size: 0.82rem;
  color: var(--text-light);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  #awards::after,
  #contact::after,
  .section-mascot {
    display: none;
  }

  .about-content {
    flex-direction: column-reverse;
    gap: 20px;
  }

  .about-mascot {
    width: 150px;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
    gap: 24px;
  }

  .hero-links {
    justify-content: center;
  }

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

  .media-row {
    flex-direction: column;
  }

  .contact-wrapper {
    grid-template-columns: 1fr;
  }

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

  .pub-item {
    flex-direction: column;
    gap: 8px;
  }

  .pub-item.has-thumb {
    flex-direction: column;
  }

  .pub-thumb {
    width: 100%;
    height: auto;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: white;
    flex-direction: column;
    padding: 16px 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }
}

@media (max-width: 480px) {
  .hero-text h1 {
    font-size: 1.7rem;
  }

  section {
    padding: 48px 0;
  }
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}