/* ========== Variables & Reset ========== */
:root {
  --iu-red: #990000;
  --iu-red-dark: #7a0000;
  --iu-red-light: #b30000;
  --iu-cream: #f7f3ee;
  --text-primary: #222222;
  --text-secondary: #555555;
  --text-light: #777777;
  --bg-white: #ffffff;
  --bg-alt: #faf8f5;
  --border-color: #e8e0d8;
  --max-width: 1060px;
  --nav-height: 56px;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.7;
  font-size: 16px;
}

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

a:hover {
  color: var(--iu-red-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ========== Navigation ========== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--iu-red);
  z-index: 1000;
  transition: box-shadow 0.3s;
}

.navbar.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  color: #ffffff;
  font-family: 'Roboto Slab', serif;
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.nav-brand:hover {
  color: #ffffff;
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 8px;
}

.nav-links a {
  color: rgba(255, 255, 255, 0.9);
  font-size: 0.9rem;
  font-weight: 400;
  padding: 6px 12px;
  border-radius: 4px;
  transition: background 0.2s, color 0.2s;
}

.nav-links a:hover {
  color: #ffffff;
  background: rgba(255, 255, 255, 0.15);
  text-decoration: none;
}

/* Hamburger */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 22px;
  height: 2px;
  background: #ffffff;
  border-radius: 2px;
  transition: transform 0.3s;
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-toggle.active .hamburger { background: transparent; }
.nav-toggle.active .hamburger::before { top: 0; transform: rotate(45deg); }
.nav-toggle.active .hamburger::after { top: 0; transform: rotate(-45deg); }

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

.section-bio {
  padding-top: calc(var(--nav-height) + 48px);
}

.section-alt {
  background: var(--bg-alt);
}

.section-title {
  font-family: 'Roboto Slab', serif;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--iu-red);
  margin-bottom: 32px;
  padding-bottom: 8px;
  border-bottom: 3px solid var(--iu-red);
  display: inline-block;
}

.section-note {
  color: var(--text-light);
  font-size: 0.9rem;
  margin-top: -20px;
  margin-bottom: 24px;
}

/* ========== Bio Section ========== */
.bio-container {
  display: flex;
  gap: 48px;
  align-items: flex-start;
}

.bio-photo {
  flex-shrink: 0;
  width: 200px;
}

.bio-photo img {
  width: 200px;
  height: 200px;
  border-radius: 12px;
  object-fit: cover;
  border: 3px solid var(--border-color);
  background: var(--bg-alt);
}

.bio-text h1 {
  font-family: 'Roboto Slab', serif;
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.bio-title {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
}

.bio-affiliation {
  font-size: 1rem;
  color: var(--iu-red);
  font-weight: 500;
  margin-bottom: 2px;
}

.bio-email {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-top: 12px;
  margin-bottom: 16px;
}

.bio-description {
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-size: 0.95rem;
}

.bio-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 20px;
}

.bio-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--iu-red);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 6px 14px;
  border: 1.5px solid var(--iu-red);
  border-radius: 6px;
  transition: all 0.2s;
}

.bio-links a:hover {
  background: var(--iu-red);
  color: #ffffff;
  text-decoration: none;
}

/* ========== News Section ========== */
.news-list {
  border-left: 3px solid var(--iu-red);
  padding-left: 24px;
}

.news-item {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  font-size: 0.95rem;
}

.news-date {
  flex-shrink: 0;
  width: 80px;
  color: var(--iu-red);
  font-weight: 500;
  font-size: 0.85rem;
}

.news-content {
  color: var(--text-secondary);
}

/* ========== Education Section ========== */
.education-list {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.education-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.edu-icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--iu-red);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  margin-top: 2px;
}

.edu-details h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 2px;
}

.edu-school {
  color: var(--iu-red);
  font-weight: 500;
  font-size: 0.95rem;
}

.edu-year {
  color: var(--text-light);
  font-size: 0.88rem;
}

.edu-note {
  color: var(--text-secondary);
  font-size: 0.88rem;
  font-style: italic;
}

/* ========== Publications Section ========== */
.publication-list {
  list-style: none;
  counter-reset: pub-counter;
}

.publication-item {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.pub-thumbnail {
  flex-shrink: 0;
  width: 160px;
  height: 100px;
  border-radius: 6px;
  overflow: hidden;
  background: var(--bg-alt);
  border: 1px solid var(--border-color);
}

.pub-thumbnail img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.pub-title {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.pub-authors {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pub-venue {
  font-size: 0.88rem;
  color: var(--text-light);
  font-style: italic;
  margin-bottom: 8px;
}

.pub-venue-tag {
  display: inline-block;
  background: var(--iu-red);
  color: #ffffff;
  font-style: normal;
  font-weight: 700;
  font-size: 0.78rem;
  padding: 1px 8px;
  border-radius: 4px;
  margin-right: 4px;
  vertical-align: middle;
}

.pub-award {
  font-size: 0.85rem;
  font-weight: 600;
  color: #b8860b;
  margin-top: 4px;
}

.pub-award a {
  color: #b8860b;
}

.pub-award a:hover {
  color: #996515;
}

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

.pub-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--iu-red);
}

.pub-links a:hover {
  text-decoration: underline;
}

/* ========== Awards Section ========== */
.awards-list {
  list-style: none;
}

.award-item {
  display: flex;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

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

.award-year {
  flex-shrink: 0;
  min-width: 120px;
  white-space: nowrap;
  color: var(--iu-red);
  font-weight: 700;
  font-size: 0.9rem;
}

.award-name {
  color: var(--text-secondary);
}

/* ========== Footer ========== */
.footer {
  background: var(--iu-red);
  color: rgba(255, 255, 255, 0.85);
  text-align: center;
  padding: 28px 0;
  font-size: 0.88rem;
}

.footer-clustrmaps {
  margin-bottom: 16px;
}

.footer-note {
  margin-top: 4px;
  font-size: 0.8rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--iu-red-dark);
    flex-direction: column;
    padding: 12px 0;
  }

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

  .nav-links a {
    padding: 10px 24px;
    border-radius: 0;
  }

  .bio-container {
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 24px;
  }

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

  .publication-item {
    flex-direction: column;
  }

  .pub-thumbnail {
    width: 100%;
    height: 160px;
  }

  .news-item {
    flex-direction: column;
    gap: 4px;
  }

  .news-date {
    width: auto;
  }

  .section-title {
    font-size: 1.3rem;
  }
}