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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: #222;
  background: #fff;
  -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 280px;
  height: 100vh;
  overflow-y: auto;
  border-right: 1px solid #e8e8e8;
  background: #fafafa;
}

.sidebar-inner {
  padding: 40px 28px 32px;
}

.main {
  margin-left: 280px;
  max-width: 740px;
  padding: 48px 48px 40px;
}

/* ===== Sidebar ===== */
.sidebar-photo {
  width: 100%;
  max-width: 200px;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center top;
  border-radius: 50%;
  display: block;
  margin-bottom: 20px;
}

.sidebar-name {
  font-size: 1.35rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: #111;
  margin-bottom: 2px;
}

.sidebar-title {
  font-size: 0.88rem;
  color: #555;
  margin-bottom: 16px;
}

.sidebar-contact {
  font-size: 0.78rem;
  color: #777;
  line-height: 1.6;
  margin-bottom: 14px;
}

.sidebar-contact a {
  color: #666;
  text-decoration: none;
  border-bottom: 1px solid #ddd;
  transition: border-color 0.15s;
}

.sidebar-contact a:hover {
  border-bottom-color: #888;
}

.sidebar-links {
  font-size: 0.85rem;
  margin-bottom: 24px;
}

.sidebar-links a {
  font-weight: 500;
  color: #333;
  text-decoration: none;
  border-bottom: 1px solid #ccc;
  transition: border-color 0.15s;
}

.sidebar-links a:hover {
  border-bottom-color: #666;
}

.sidebar-links .sep {
  color: #ccc;
  margin: 0 5px;
}

/* Sidebar navigation */
.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-top: 16px;
  border-top: 1px solid #e0e0e0;
}

.sidebar-nav a {
  font-size: 0.82rem;
  font-weight: 500;
  color: #666;
  text-decoration: none;
  padding: 3px 0;
  transition: color 0.15s;
}

.sidebar-nav a:hover {
  color: #111;
}


/* ===== About / Bio ===== */
#about {
  padding-bottom: 28px;
  border-bottom: 1px solid #eee;
  margin-bottom: 8px;
}

.bio {
  font-size: 0.95rem;
  line-height: 1.7;
  color: #333;
  margin-bottom: 10px;
}

.bio:last-child {
  margin-bottom: 0;
}

.bio a {
  color: #333;
  text-decoration: none;
  border-bottom: 1px solid #ccc;
  transition: border-color 0.15s;
}

.bio a:hover {
  border-bottom-color: #666;
}

/* ===== Sections ===== */
section {
  padding: 28px 0 12px;
}

section h2 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #111;
  letter-spacing: -0.01em;
  margin-bottom: 18px;
  padding-bottom: 8px;
  border-bottom: 1px solid #eee;
}

/* ===== Paper entries ===== */
.paper {
  margin-bottom: 18px;
}

.paper-title {
  font-size: 0.92rem;
  font-weight: 500;
  line-height: 1.45;
  margin-bottom: 2px;
}

.paper-title a {
  color: #222;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.paper-title a:hover {
  border-bottom-color: #888;
}

.paper-authors {
  font-size: 0.82rem;
  color: #666;
  margin-bottom: 2px;
}

.paper-authors a {
  color: #555;
  text-decoration: none;
  border-bottom: 1px solid #ddd;
  transition: border-color 0.15s;
}

.paper-authors a:hover {
  border-bottom-color: #888;
}

.paper-journal {
  font-size: 0.82rem;
  color: #555;
  margin-bottom: 2px;
}

.paper-links {
  font-size: 0.8rem;
  color: #888;
}

.paper-links a {
  color: #666;
  text-decoration: none;
  border-bottom: 1px solid #ddd;
  transition: border-color 0.15s;
}

.paper-links a:hover {
  border-bottom-color: #888;
}

.paper-links .note {
  font-style: italic;
  color: #999;
}

/* ===== Teaching ===== */
.teaching-list {
  list-style: none;
  padding: 0;
}

.teaching-list li {
  font-size: 0.9rem;
  padding: 4px 0;
  color: #444;
}

.teaching-list li a {
  color: #333;
  text-decoration: none;
  border-bottom: 1px solid #ddd;
  transition: border-color 0.15s;
}

.teaching-list li a:hover {
  border-bottom-color: #888;
}

/* ===== Generic link style ===== */
a {
  color: #333;
  text-decoration: none;
}

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid #e8e8e8;
  }

  .sidebar-inner {
    padding: 28px 24px 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 0 28px;
    align-items: flex-start;
  }

  .sidebar-photo {
    width: 120px;
    max-width: 120px;
    margin-bottom: 0;
  }

  .sidebar-inner > *:not(.sidebar-photo) {
    flex: 1;
    min-width: 200px;
  }

  .sidebar-name {
    margin-top: 0;
  }

  .sidebar-nav {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px 16px;
    width: 100%;
    flex-basis: 100%;
  }

  .main {
    margin-left: 0;
    padding: 32px 24px 24px;
  }
}

@media (max-width: 480px) {
  .sidebar-inner {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .sidebar-photo {
    width: 140px;
    max-width: 140px;
    margin-bottom: 16px;
  }

  .sidebar-nav {
    justify-content: center;
  }

  .main {
    padding: 24px 16px 20px;
  }
}