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

html { scroll-behavior: smooth; font-size: 15px; }

body {
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  color: #494e52;
  background: #fff;
  line-height: 1.5;
}

a { color: #224b8d; text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus { outline: thin dotted #f89406; outline: 5px auto #f89406; outline-offset: -2px; }

ul { list-style: disc; padding-left: 1.4em; }
ul li { margin-bottom: 0.3em; }

/* ===== TOP NAVIGATION ===== */
.masthead {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #fff;
  border-bottom: 1px solid #e0e0e0;
  z-index: 1000;
  height: 48px;
}

.masthead__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  height: 100%;
}

.masthead__title {
  font-weight: bold;
  font-size: 1em;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  color: #494e52;
  margin-right: 2rem;
  white-space: nowrap;
}

.masthead__nav {
  display: flex;
  gap: 0;
  flex-wrap: nowrap;
  overflow: hidden;
}

.masthead__nav a {
  color: #494e52;
  font-size: 1em;
  padding: 0 0.85rem;
  height: 48px;
  display: flex;
  align-items: center;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.masthead__nav a:hover,
.masthead__nav a.active {
  color: #224b8d;
  border-bottom-color: #224b8d;
  text-decoration: none;
}

/* hamburger for mobile */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 0.4rem;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 22px;
  height: 2px;
  background: #444;
  position: relative;
  transition: 0.3s;
}
.nav-toggle span::before,
.nav-toggle span::after {
  content: '';
  position: absolute;
}
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after  { top:  6px; }

/* ===== PAGE LAYOUT ===== */
.page-wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 72px 1.5rem 3rem;
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 240px;
  flex-shrink: 0;
  position: sticky;
  top: 64px;
}

.profile-box {
  text-align: center;
}

.profile-box .avatar {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid #e8e8e8;
  margin-bottom: 0.75rem;
}

.profile-box .avatar-placeholder {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: #fff;
  margin-bottom: 0.75rem;
  border: 3px solid #e8e8e8;
}

.profile-name {
  font-size: 1.2em;
  font-weight: bold;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  color: #494e52;
  margin-bottom: 0.2rem;
}

.profile-affil {
  font-size: 1em;
  color: #494e52;
  margin-bottom: 0.75rem;
}

.profile-bio {
  font-size: 1em;
  color: #494e52;
  line-height: 1.5;
  text-align: left;
  margin-bottom: 1rem;
  padding: 0 0.25rem;
}

.social-links {
  list-style: none;
  padding: 0;
  text-align: left;
}

.social-links li {
  margin-bottom: 0.45rem;
}

.social-links a {
  font-size: 1em;
  color: #494e52;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.social-links a:hover { color: #224b8d; text-decoration: none; }

.social-links i {
  width: 18px;
  text-align: center;
  color: #494e52;
  flex-shrink: 0;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1;
  min-width: 0;
}

/* ===== SECTION ===== */
.section {
  margin-bottom: 2.8rem;
  scroll-margin-top: 64px;
}

.section h1 {
  font-size: 1.4em;
  font-weight: bold;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  color: #494e52;
  margin: 1em 0 0.5em;
  line-height: 1.2;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid #eaeaea;
}

.section p {
  margin-bottom: 0.75rem;
}

/* ===== NEWS ===== */
.news-list {
  list-style: none;
  padding: 0;
}

.news-list li {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
  font-size: 0.92rem;
  align-items: flex-start;
  line-height: 1.55;
}

.news-date {
  flex-shrink: 0;
  font-style: italic;
  color: #777a7d;
  min-width: 70px;
}

/* ===== PAPER BOX ===== */
.paper-box {
  display: flex;
  gap: 1.2rem;
  margin-bottom: 1.6rem;
  padding-bottom: 1.6rem;
  border-bottom: 1px solid #f0f0f0;
}

.paper-box:last-child { border-bottom: none; }

.paper-box-image {
  flex-shrink: 0;
  width: 200px;
}

.paper-box-image .badge {
  display: inline-block;
  background: #2a6db5;
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
}

.badge-findings { background: #5a9a5a; }
.badge-arxiv    { background: #b55a2a; }
.badge-in-progress { background: #888; }

.paper-box-image img {
  width: 100%;
  border-radius: 4px;
  border: 1px solid #e0e0e0;
  display: block;
  margin-top: 0.35rem;
}

.paper-img-placeholder {
  width: 100%;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8edf5 100%);
  border-radius: 4px;
  border: 1px solid #dde2ee;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #aaa;
  font-size: 0.75rem;
  text-align: center;
}

.paper-box-text {
  flex: 1;
  min-width: 0;
}

.paper-box-text h3 {
  font-size: 1em;
  font-weight: bold;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  color: #494e52;
  margin-bottom: 0.3rem;
  line-height: 1.2;
}

.paper-box-text .authors {
  font-size: 1em;
  color: #494e52;
  margin-bottom: 0.4rem;
}

.paper-box-text .authors strong {
  color: #494e52;
}

.paper-box-text .venue {
  font-size: 1em;
  font-style: italic;
  color: #494e52;
  margin-bottom: 0.5rem;
}

.paper-box-text .links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.6rem;
  align-items: center;
}

.paper-box-text .links img {
  display: block;
  height: 20px;
}

.link-btn {
  display: inline-block;
  font-size: 1em;
  font-weight: bold;
  font-family: "Trebuchet MS", Helvetica, sans-serif;
  padding: 0.15rem 0.55rem;
  border: 1px solid #224b8d;
  border-radius: 3px;
  color: #224b8d;
  transition: background 0.15s, color 0.15s;
}

.link-btn:hover {
  background: #224b8d;
  color: #fff;
  text-decoration: none;
}

.paper-box-text ul {
  font-size: 1em;
  color: #494e52;
  padding-left: 1.2em;
}

.paper-box-text ul li { margin-bottom: 0.25rem; }

/* ===== PLAIN PUBLICATION LIST ===== */
.pub-list {
  list-style: none;
  padding: 0;
}

.pub-list li {
  margin-bottom: 1rem;
  font-size: 1em;
  padding-left: 1rem;
  border-left: 3px solid #e0e0e0;
  line-height: 1.5;
}

.pub-list li .pub-venue {
  font-weight: normal;
  color: #494e52;
}

/* ===== EDUCATION ===== */
.edu-list {
  list-style: none;
  padding: 0;
}

.edu-list li {
  margin-bottom: 0.9rem;
  font-size: 1em;
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.edu-date {
  flex-shrink: 0;
  font-style: italic;
  color: #777a7d;
  min-width: 140px;
}

/* ===== SKILLS ===== */
.skills-box {
  font-size: 1em;
  color: #494e52;
  background: #f8f9fa;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  border-left: 3px solid #224b8d;
}

/* ===== HONORS ===== */
.honors-list { font-size: 1em; color: #494e52; }
.honors-list li { margin-bottom: 0.4rem; }

/* ===== FOOTER ===== */
.site-footer {
  text-align: center;
  font-size: 1em;
  color: #777a7d;
  padding: 1.5rem;
  border-top: 1px solid #eee;
  margin-top: 2rem;
}

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

  .masthead__nav {
    display: none;
    position: absolute;
    top: 48px;
    left: 0;
    width: 100%;
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    flex-direction: column;
    padding: 0.5rem 0;
  }

  .masthead__nav.open { display: flex; }

  .masthead__nav a {
    height: auto;
    padding: 0.6rem 1.5rem;
    border-bottom: none;
    border-left: 3px solid transparent;
  }

  .masthead__nav a:hover,
  .masthead__nav a.active {
    border-bottom: none;
    border-left-color: #2a6db5;
  }

  .page-wrap {
    flex-direction: column;
    padding-top: 64px;
  }

  .sidebar {
    width: 100%;
    position: static;
  }

  .profile-box { text-align: center; }

  .social-links { display: inline-block; text-align: left; }

  .paper-box {
    flex-direction: column;
  }

  .paper-box-image { width: 100%; max-width: 260px; }

  .edu-date { min-width: 110px; }
}