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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: 'Source Sans 3', 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: #2c2c2c;
  background: #fafafa;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===== NAVIGATION ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.97);
  border-bottom: 1px solid #e0e0e0;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

nav .nav-inner {
  max-width: 1060px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 60px;
}

nav .nav-name {
  font-weight: 700;
  font-size: 1.1rem;
  color: #07294d;
  text-decoration: none;
  letter-spacing: 0.01em;
}

nav .nav-links {
  display: flex;
  gap: 1.8rem;
  list-style: none;
}

nav .nav-links a {
  text-decoration: none;
  color: #555;
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
  letter-spacing: 0.01em;
}

nav .nav-links a:hover {
  color: #07294d;
}

nav .hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

nav .hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #2c2c2c;
  margin: 5px 0;
  transition: all 0.3s;
}

/* ===== HERO / ABOUT ===== */
.hero {
  padding: 8rem 2rem 4rem;
  max-width: 1060px;
  margin: 0 auto;
  display: flex;
  gap: 3.5rem;
  align-items: flex-start;
}

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

.hero-photo img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #e0e0e0;
}

.hero-text h1 {
  font-size: 2.2rem;
  font-weight: 700;
  color: #07294d;
  margin-bottom: 0.25rem;
}

.hero-text .title {
  font-size: 1.05rem;
  color: #666;
  margin-bottom: 0.15rem;
}

.hero-text .affiliation {
  font-size: 0.95rem;
  color: #888;
  margin-bottom: 1.25rem;
}

.hero-text .bio {
  font-size: 1rem;
  line-height: 1.8;
  color: #3a3a3a;
  max-width: 640px;
}

.hero-text .bio p {
  margin-bottom: 1rem;
}

.hero-links {
  display: flex;
  gap: 1rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: #07294d;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.4rem 0.85rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  transition: all 0.2s;
}

.hero-links a:hover {
  background: #07294d;
  color: #fff;
  border-color: #07294d;
}

.hero-links a svg {
  width: 16px;
  height: 16px;
}

/* ===== SECTIONS ===== */
section {
  padding: 3.5rem 2rem;
  max-width: 1060px;
  margin: 0 auto;
}

section h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: #07294d;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid #07294d;
}

section h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: #333;
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

/* ===== RESEARCH ===== */
.research-intro {
  font-size: 1rem;
  line-height: 1.8;
  color: #3a3a3a;
  max-width: 780px;
  margin-bottom: 1.5rem;
}

.research-areas {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.research-area {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 6px;
  padding: 1.5rem;
  transition: box-shadow 0.2s;
}

.research-area:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

.research-area h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #07294d;
  margin-bottom: 0.5rem;
}

.research-area p {
  font-size: 0.92rem;
  color: #555;
  line-height: 1.65;
}

/* ===== PUBLICATIONS ===== */
.pub-list {
  list-style: none;
}

.pub-list li {
  padding: 1rem 0;
  border-bottom: 1px solid #eee;
  line-height: 1.65;
}

.pub-list li:last-child {
  border-bottom: none;
}

.pub-title {
  font-weight: 600;
  color: #2c2c2c;
}

a.pub-title {
  transition: border-color 0.2s;
}

a.pub-title:hover {
  border-color: #07294d;
}

.pub-journal {
  font-style: italic;
  color: #666;
}

.pub-year {
  color: #888;
  font-size: 0.9rem;
}

.pub-award {
  display: inline-block;
  background: #fef3cd;
  color: #856404;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-left: 0.5rem;
}

.pub-status {
  display: inline-block;
  background: #e8f4fd;
  color: #0c5a8a;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-left: 0.5rem;
}

.pub-category {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: #999;
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

/* ===== TEACHING ===== */
.teaching-block {
  margin-bottom: 2rem;
}

.teaching-block p {
  font-size: 1rem;
  line-height: 1.8;
  color: #3a3a3a;
  max-width: 780px;
  margin-bottom: 0.75rem;
}

.course-list {
  list-style: none;
  margin-top: 0.75rem;
}

.course-list li {
  padding: 0.6rem 0;
  border-bottom: 1px solid #f0f0f0;
  font-size: 0.95rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
}

.course-list li:last-child {
  border-bottom: none;
}

.course-code {
  font-weight: 600;
  color: #07294d;
  font-size: 0.85rem;
  min-width: 90px;
}

.course-name {
  color: #3a3a3a;
}

.course-level {
  color: #888;
  font-size: 0.85rem;
  margin-left: auto;
}

/* ===== AI & EXECUTIVE ED ===== */
.ai-exec-intro {
  font-size: 1rem;
  line-height: 1.8;
  color: #3a3a3a;
  max-width: 780px;
  margin-bottom: 1.5rem;
}

.highlight-box {
  background: #fff;
  border-left: 3px solid #07294d;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  border-radius: 0 6px 6px 0;
}

.highlight-box p {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #3a3a3a;
}

.exec-roles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.exec-role {
  background: #fff;
  border: 1px solid #e8e8e8;
  border-radius: 6px;
  padding: 1.5rem;
}

.exec-role h4 {
  font-size: 1rem;
  font-weight: 600;
  color: #07294d;
  margin-bottom: 0.5rem;
}

.exec-role p {
  font-size: 0.92rem;
  color: #555;
  line-height: 1.65;
}

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

.awards-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid #f0f0f0;
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.awards-list li:last-child {
  border-bottom: none;
}

.award-year {
  font-weight: 600;
  color: #07294d;
  font-size: 0.9rem;
  min-width: 42px;
}

.award-text {
  font-size: 0.95rem;
  color: #3a3a3a;
  line-height: 1.55;
}

.award-org {
  color: #888;
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}

.contact-item {
  font-size: 0.95rem;
  color: #3a3a3a;
}

.contact-item strong {
  display: block;
  color: #07294d;
  margin-bottom: 0.25rem;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.contact-item a {
  color: #07294d;
  text-decoration: none;
  border-bottom: 1px solid #ccc;
  transition: border-color 0.2s;
}

.contact-item a:hover {
  border-color: #07294d;
}

/* ===== FOOTER ===== */
footer {
  text-align: center;
  padding: 2rem;
  font-size: 0.82rem;
  color: #aaa;
  border-top: 1px solid #eee;
  margin-top: 2rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  nav .nav-links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 1rem 2rem;
    border-bottom: 1px solid #e0e0e0;
    gap: 0.75rem;
  }

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

  nav .hamburger {
    display: block;
  }

  .hero {
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding-top: 6rem;
    gap: 1.5rem;
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }

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

  .hero-photo img {
    width: 160px;
    height: 160px;
  }

  section {
    padding: 2.5rem 1.25rem;
  }

  .course-list li {
    flex-direction: column;
    gap: 0.15rem;
  }

  .course-level {
    margin-left: 0;
  }

  .awards-list li {
    flex-direction: column;
    gap: 0.25rem;
  }
}