/* =========================
   CMU Modern Light Theme
   ========================= */

/* CMU Colors */
:root {
  --cmu-red: #a6192e;
  --cmu-red-dark: #8e1627;
  --cmu-gray-900: #1a1a1a;
  --cmu-gray-700: #444;
  --cmu-gray-500: #666;
  --cmu-gray-300: #d6d9dc;
  --cmu-gray-100: #f7f8f9;
  --white: #ffffff;

  --bg: #fafafa;
  --text: var(--cmu-gray-900);
  --muted: var(--cmu-gray-500);
  --border: var(--cmu-gray-300);
  --link: var(--cmu-red);
  --link-hover: var(--cmu-red-dark);
  --shadow: 0 6px 14px rgba(0, 0, 0, 0.05);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 18px;

  --container-w: 960px;
  --gutter: 24px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  margin: 0 auto;
  padding: 0 var(--gutter);
  max-width: var(--container-w);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", sans-serif;
  line-height: 1.7;
  font-size: 16.5px;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

/* Headings */
h1, h2, h3 {
  color: var(--text);
  font-family: "Crimson Text", "Georgia", serif;
  letter-spacing: -0.01em;
  margin: 0 0 12px;
}

h1 { font-size: clamp(2rem, 4vw, 2.4rem); font-weight: 700; }
h2 { font-size: 1.6rem; font-weight: 600; border-bottom: 2px solid var(--border); padding-bottom: 6px; margin-bottom: 18px; }
h3 { font-size: 1.3rem; font-weight: 600; color: var(--cmu-red-dark); }

/* Links */
a {
  color: var(--link);
  text-decoration: none;
  transition: color 0.2s ease, text-decoration 0.2s ease;
}
a:hover {
  color: var(--link-hover);
  text-decoration: underline;
}

/* --- Top Banner / Navigation (Flat with Underline) --- */
.banner {
  background: transparent;
  padding: 30px 0 20px;
  text-align: center;
  border-bottom: 1.5px solid var(--border);
  margin-bottom: 40px;
}

.navbar {
  display: flex;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
}

.navbar .nav-link {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.02em;
  color: var(--cmu-gray-700);
  text-decoration: none;
  position: relative;
  padding-bottom: 4px;
  transition: color 0.2s ease;
}

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

.navbar .nav-link.active {
  color: var(--link);
  border-bottom: 2px solid var(--link);
}


/* --- Intro Section (Centered Layout) --- */
.intro-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
  margin: 0 auto 60px;
  max-width: 800px;
}

.profile-photo img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow);
  border: 4px solid var(--white);
}

.intro-text {
  max-width: 600px;
}

.intro-text h1 {
  font-family: "Crimson Text", "Georgia", serif;
  font-weight: 700;
  font-size: clamp(1.8rem, 3vw, 2.2rem);
  color: var(--cmu-gray-900);
  margin-bottom: 8px;
}

.intro-text p {
  font-size: 1.05rem;
  color: var(--muted);
  margin-top: 0;
}

.social-icons {
  margin-top: 16px;
  display: flex;
  justify-content: center;
  gap: 14px;
}

.social-icons a {
  color: var(--cmu-gray-500);
  font-size: 1.3rem;
  transition: color 0.2s ease;
}

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

.school-info {
  text-align: center;
  margin-top: 12px;
}

.school-info h1 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
}

.school-info p {
  font-size: 1rem;
  color: var(--muted);
  margin: 2px 0;
}




/* Section */
.section {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow);
  padding: 24px 28px;
  margin-bottom: 40px;
}

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

/* Publications */
.pub-container {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.pub-item {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background-color: var(--white);
  padding: 20px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.pub-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0,0,0,0.08);
}

.pub-item img {
  width: 120px;
  height: 90px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}

.pub-title {
  font-weight: 600;
  font-size: 1.15rem;
  margin-bottom: 4px;
}

.pub-authors {
  color: var(--muted);
  font-size: 0.95rem;
}

.pub-venue {
  color: var(--link);
  font-weight: 500;
  font-size: 0.9rem;
}

/* Buttons */
.btn {
  display: inline-block;
  background-color: var(--link);
  color: white;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 1rem;
  transition: background-color 0.2s ease, transform 0.15s ease;
}
.btn:hover {
  background-color: var(--link-hover);
  transform: translateY(-1px);
}

/* Footer */
footer {
  text-align: center;
  padding: 36px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 768px) {
  .intro-container {
    flex-direction: column;
    text-align: center;
  }
  .school-info { text-align: center; margin-top: 16px; }
  .pub-item {
    flex-direction: column;
  }
}