/* ============================================
   Jack Ng Academic Homepage - main.css
   Inspired by rongtingting.github.io style
   ============================================ */

:root {
  --primary:     #2563eb;
  --primary-dark:#1d4ed8;
  --accent:      #0ea5e9;
  --text:        #1e293b;
  --text-light:  #64748b;
  --border:      #e2e8f0;
  --bg:          #f8fafc;
  --white:       #ffffff;
  --sidebar-w:   280px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
}

/* ── 整体布局 ── */
.container {
  display: flex;
  min-height: 100vh;
  max-width: 1200px;
  margin: 0 auto;
  background: var(--white);
  box-shadow: 0 0 40px rgba(0,0,0,0.06);
}

/* ─────────────────────────────────────────
   左侧边栏
───────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  background: var(--white);
  border-right: 1px solid var(--border);
}

.sidebar-inner {
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

/* 头像 */
.avatar {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--border);
  margin-bottom: 18px;
  transition: border-color 0.2s;
}
.avatar:hover { border-color: var(--primary); }

/* 姓名职位 */
.name {
  font-size: 1.35em;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}
.role {
  font-size: 0.88em;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 10px;
}
.institution, .location {
  font-size: 0.83em;
  color: var(--text-light);
  margin-bottom: 4px;
}
.institution i, .location i {
  margin-right: 5px;
  color: var(--primary);
  font-size: 0.85em;
}

.divider {
  width: 100%;
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}

/* 导航 */
.sidebar nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
}
.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 8px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 0.9em;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}
.sidebar nav a i { width: 16px; font-size: 0.85em; }
.sidebar nav a:hover,
.sidebar nav a.active {
  background: #eff6ff;
  color: var(--primary);
}

/* 社交图标 */
.social-links {
  display: flex;
  gap: 12px;
  margin-bottom: 16px;
}
.social-links a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-light);
  font-size: 1em;
  text-decoration: none;
  transition: background 0.15s, color 0.15s;
}
.social-links a:hover {
  background: var(--primary);
  color: var(--white);
}

/* CV 按钮 */
.cv-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 18px;
  background: var(--primary);
  color: var(--white);
  border-radius: 6px;
  font-size: 0.85em;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.15s;
}
.cv-btn:hover { background: var(--primary-dark); }

/* ─────────────────────────────────────────
   右侧主内容
───────────────────────────────────────── */
.main-content {
  flex: 1;
  padding: 60px 56px;
  max-width: 860px;
}

/* Section 通用样式 */
section {
  margin-bottom: 64px;
  scroll-margin-top: 30px;
}

section h2 {
  font-size: 1.45em;
  font-weight: 700;
  color: var(--text);
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}
section h2 i { color: var(--primary); font-size: 0.85em; }

/* ── Biography ── */
#biography p { color: var(--text); margin-bottom: 12px; }

.interests-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.interest-tag {
  background: #eff6ff;
  color: var(--primary);
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.82em;
  font-weight: 500;
}

/* ── Experience ── */
.exp-list { display: flex; flex-direction: column; gap: 20px; }
.exp-item {
  display: flex;
  gap: 20px;
  padding: 16px;
  background: var(--bg);
  border-radius: 10px;
  border-left: 4px solid var(--primary);
}
.exp-year {
  min-width: 120px;
  font-size: 0.82em;
  color: var(--text-light);
  font-weight: 500;
  padding-top: 2px;
}
.exp-body strong { display: block; font-weight: 600; margin-bottom: 2px; }
.exp-body em { color: var(--text-light); font-size: 0.88em; }
.exp-body p { font-size: 0.9em; color: var(--text-light); margin-top: 4px; }

/* ── Publications ── */
.pub-list { display: flex; flex-direction: column; gap: 18px; }
.pub-item {
  padding: 18px 20px;
  background: var(--bg);
  border-radius: 10px;
  border-left: 4px solid var(--accent);
}
.pub-title {
  font-weight: 600;
  font-size: 0.97em;
  margin-bottom: 4px;
  color: var(--text);
}
.pub-authors { font-size: 0.86em; color: var(--text-light); margin-bottom: 4px; }
.pub-authors .me { font-weight: 700; color: var(--text); }
.pub-venue { font-size: 0.84em; color: var(--primary); font-style: italic; margin-bottom: 8px; }
.pub-links { display: flex; gap: 8px; flex-wrap: wrap; }
.pub-links a {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.78em;
  color: var(--text-light);
  text-decoration: none;
  font-weight: 500;
  transition: border-color 0.15s, color 0.15s;
}
.pub-links a:hover { border-color: var(--primary); color: var(--primary); }

/* ── Contact ── */
.contact-list { display: flex; flex-direction: column; gap: 12px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.93em;
}
.contact-item i {
  width: 20px;
  color: var(--primary);
  font-size: 1em;
}
.contact-item a { color: var(--primary); text-decoration: none; }
.contact-item a:hover { text-decoration: underline; }

/* ─────────────────────────────────────────
   响应式（手机）
───────────────────────────────────────── */
@media (max-width: 768px) {
  .container { flex-direction: column; }

  .sidebar {
    width: 100%;
    min-width: unset;
    height: auto;
    position: relative;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }
  .sidebar-inner { padding: 28px 20px; }

  .main-content { padding: 36px 20px; }

  .exp-item { flex-direction: column; gap: 6px; }
  .exp-year { min-width: unset; }
}