/* ============================================================
   Theme variables
============================================================ */
:root {
  /* Light mode (grey-blue) */
  --bg: #eef2f7;
  --bg-elev: #e2e8f0;
  --surface: #f4f7fb;
  --text: #1f2a37;
  --text-muted: #5a6878;
  --accent: #3b6ea5;
  --accent-soft: #8aaed2;
  --accent-bg: #dde7f2;
  --border: #cdd7e3;
  --line: #b8c4d3;
  --link: #2f5e8f;
  --shadow: 0 4px 18px rgba(30, 60, 100, 0.08);
}

[data-theme="dark"] {
  --bg: #161b22;
  --bg-elev: #1c222b;
  --surface: #1a2029;
  --text: #dfe6ee;
  --text-muted: #93a1b3;
  --accent: #6fa3d4;
  --accent-soft: #4f7fae;
  --accent-bg: #213040;
  --border: #2e3a48;
  --line: #3a4a5c;
  --link: #8fb8e0;
  --shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s ease, color 0.3s ease;
}

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
a:hover { border-bottom-color: var(--link); }

/* ============================================================
   Top bar
============================================================ */
.top-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: saturate(150%) blur(8px);
}
.top-bar-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 18px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  border-bottom: none;
}
.top-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}
.cv-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 18px;
  border-radius: 999px;
  border: 1.5px solid var(--accent);
  color: var(--accent);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.2s ease, color 0.2s ease;
}
.cv-button:hover {
  background: var(--accent);
  color: #fff;
  border-bottom-color: var(--accent);
}
.theme-toggle {
  background: transparent;
  border: none;
  color: var(--text);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background 0.2s ease;
}
.theme-toggle:hover { background: var(--bg-elev); }

/* ============================================================
   Layout
============================================================ */
.layout {
  max-width: 1180px;
  margin: 0 auto;
  padding: 36px 32px 80px;
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}

/* ============================================================
   Sidebar
============================================================ */
.sidebar {
  position: sticky;
  top: 96px;
}
.profile { text-align: left; }
.avatar {
  width: 220px;
  height: 220px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 20%;
  display: block;
  margin: 0 auto 22px;
  box-shadow: var(--shadow);
}
.name {
  font-size: 1.7rem;
  font-weight: 800;
  margin: 8px 0 14px;
  letter-spacing: -0.02em;
}
.name-cn {
  font-weight: 600;
  color: var(--text-muted);
  font-size: 1.4rem;
}

.socials {
  display: flex;
  gap: 8px;
  margin-bottom: 18px;
  flex-wrap: wrap;
}
.social {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
  font-size: 0.95rem;
  transition: transform 0.2s ease, background 0.2s ease, color 0.2s ease;
}
.social:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-2px);
  border-color: var(--accent);
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 14px 0 24px;
  font-size: 0.92rem;
  color: var(--text-muted);
}
.contact-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 0;
}
.contact-list i {
  color: var(--accent);
  width: 16px;
  text-align: center;
}

.interests-card {
  border: 1.5px dashed var(--line);
  border-radius: 12px;
  padding: 18px 20px;
  background: transparent;
}
.interests-card h3 {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 1.05rem;
  font-weight: 700;
}
.interests-card ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.interests-card li {
  padding: 4px 0 4px 16px;
  position: relative;
  font-size: 0.95rem;
}
.interests-card li::before {
  content: "•";
  color: var(--accent);
  position: absolute;
  left: 0;
  font-weight: 700;
}

/* ============================================================
   Content
============================================================ */
.content { min-width: 0; }
.block { margin-bottom: 44px; }

.section-heading {
  color: var(--accent);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0 0 18px;
  padding-bottom: 6px;
  border-bottom: 2px solid var(--accent-soft);
  display: inline-block;
}

.content p { margin: 0 0 14px; }

/* Timeline (news / awards / experience) */
.timeline {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--line);
}
.timeline > li {
  padding: 8px 0 8px 18px;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}
.news-text { flex: 1 1 auto; }
.news-date {
  color: var(--text-muted);
  font-size: 0.88rem;
  white-space: nowrap;
}

/* Entry list (education / experience) */
.entry-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.entry,
.exp,
.timeline > .exp {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 16px;
  padding: 12px 0 12px 18px;
  align-items: flex-start;
}
.entry-logo,
.exp-logo {
  width: 44px;
  height: 44px;
  border-radius: 8px;
  background: var(--surface);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.15rem;
  flex-shrink: 0;
  border: 1px solid var(--border);
  overflow: hidden;
  margin-top: 4px;
}
.entry-logo img,
.exp-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 4px;
}
.entry-body h3,
.exp-body h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 700;
}
.entry-sub,
.exp-sub {
  margin: 0 0 4px;
  color: var(--text);
}
.entry-meta {
  margin: 0 0 4px;
  font-size: 0.92rem;
  color: var(--text-muted);
}
.entry-date {
  margin: 4px 0 0;
  color: var(--accent);
  font-weight: 500;
  font-size: 0.9rem;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 6px 0 4px;
}
.tag {
  font-size: 0.82rem;
  padding: 3px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

/* Publications */
.pubs {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--line);
}
.pubs > li {
  padding: 14px 0 14px 18px;
}
.pubs h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  line-height: 1.4;
}
.authors {
  margin: 0 0 4px;
  color: var(--text-muted);
  font-size: 0.94rem;
}
.venue {
  margin: 0 0 8px;
  font-weight: 600;
  font-size: 0.94rem;
}
.highlight {
  background: var(--accent-bg);
  color: var(--accent);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.8rem;
  font-weight: 600;
}
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}
.badge {
  font-size: 0.82rem;
  font-weight: 600;
  padding: 3px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}
.badge:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

/* Show more buttons + hidden items */
.hidden-extra { display: none; }
.expanded .hidden-extra { display: list-item; }
.expanded .show-more { display: none; }
.show-more {
  margin-top: 14px;
  margin-left: 18px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  cursor: pointer;
  padding: 4px 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: color 0.2s ease;
}
.show-more:hover { color: var(--accent); }

/* Footer */
.site-footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 24px 32px 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  border-top: 1px solid var(--border);
}

/* ============================================================
   Responsive
============================================================ */
@media (max-width: 880px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 24px 20px 60px;
  }
  .sidebar {
    position: static;
    text-align: center;
  }
  .profile { text-align: center; }
  .avatar { width: 180px; height: 180px; }
  .socials,
  .contact-list { justify-content: center; }
  .contact-list li { justify-content: center; }
  .top-bar-inner { padding: 14px 20px; }
  .cv-button span { display: none; }
  .cv-button { padding: 8px 12px; }
}