/* ============================================================
   主题变量（修改 --accent 即可更换主题色）
   ============================================================ */
:root {
  --accent: #2563eb;
  --accent-2: #0284c7;
  --accent-soft: rgba(37, 99, 235, 0.1);
  --glow-2: rgba(14, 165, 233, 0.07);
  --on-accent: #ffffff;

  --bg: #f8fafc;
  --bg-elev: #ffffff;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: #e2e8f0;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 4px 16px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 10px 30px rgba(15, 23, 42, 0.1);

  --radius: 14px;
  --topbar-h: 64px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Source Serif 4", Georgia, "Songti SC", serif;
}

[data-theme="dark"] {
  --accent: #60a5fa;
  --accent-2: #38bdf8;
  --accent-soft: rgba(96, 165, 250, 0.14);
  --glow-2: rgba(56, 189, 248, 0.06);
  --on-accent: #0a1120;

  --bg: #0a1120;
  --bg-elev: #111b2e;
  --text: #e2e8f0;
  --text-2: #a3b1c6;
  --text-3: #64748b;
  --border: #1f2a44;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.4);
}

/* ============================================================
   基础
   ============================================================ */
*,
*::before,
*::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--topbar-h) + 16px); }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  background-image:
    radial-gradient(1200px 500px at 90% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(900px 400px at -10% 10%, var(--glow-2), transparent 60%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s, color .3s;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-2); }
.prose a { border-bottom: 1px solid color-mix(in srgb, var(--accent) 35%, transparent); }
.prose a:hover { border-bottom-color: var(--accent-2); }

button { font: inherit; cursor: pointer; }
h1, h2, h3 { line-height: 1.3; margin: 0; }
::selection { background: var(--accent); color: var(--on-accent); }

/* ============================================================
   顶部导航
   ============================================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--topbar-h);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}
.topbar-inner {
  max-width: 1200px;
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--accent); }

.nav { display: flex; gap: 4px; margin-left: auto; }
.nav a {
  position: relative;
  padding: 6px 12px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-2);
  border-radius: 8px;
}
.nav a:hover { color: var(--text); background: var(--accent-soft); }
.nav a.active { color: var(--accent); }
.nav a.active::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: -2px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.topbar-actions { display: flex; gap: 6px; }
.icon-btn {
  width: 38px; height: 38px;
  display: inline-grid; place-items: center;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--text-2);
  border-radius: 10px;
  transition: all .2s;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: none; }
[data-theme="dark"] .icon-moon { display: block; }
.menu-btn { display: none; }

/* ============================================================
   布局
   ============================================================ */
.layout {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 24px 0;
  display: grid;
  grid-template-columns: 290px minmax(0, 1fr);
  gap: 56px;
}

/* ============================================================
   侧边栏
   ============================================================ */
.sidebar { position: relative; }
.profile {
  position: sticky;
  top: calc(var(--topbar-h) + 32px);
  text-align: center;
  padding: 32px 24px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--shadow);
}
.avatar-frame {
  width: 190px;
  max-width: 100%;
  aspect-ratio: 1 / 1;
  margin: 0 auto 20px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 0 0 1px var(--border), var(--shadow-lg);
  isolation: isolate;
}
.avatar {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  display: block;
  transition: transform .5s cubic-bezier(.2, .8, .2, 1);
}
.avatar-frame:hover .avatar { transform: scale(1.30); }
.name {
  font-family: var(--font-serif);
  font-size: 1.65rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.name-alt { margin: 2px 0 0; color: var(--text-3); font-size: 0.95rem; }
.role {
  display: inline-block;
  margin: 14px 0 6px;
  padding: 3px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}
.affiliation { margin: 0; color: var(--text-2); font-size: 0.93rem; line-height: 1.55; }

.meta {
  list-style: none;
  margin: 20px 0 0;
  padding: 18px 0 0;
  border-top: 1px dashed var(--border);
  font-size: 0.9rem;
  color: var(--text-2);
  text-align: left;
}
.meta li { display: flex; align-items: center; gap: 10px; padding: 4px 0; }
.meta svg { flex-shrink: 0; color: var(--text-3); }
.meta a { color: var(--text-2); word-break: break-all; }
.meta a:hover { color: var(--accent); }

.socials { display: flex; justify-content: center; flex-wrap: wrap; gap: 8px; margin: 18px 0 20px; }
.socials a {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: 10px;
  color: var(--text-2);
  background: var(--bg);
  border: 1px solid var(--border);
  transition: all .2s;
}
.socials a:hover {
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
  transform: translateY(-2px);
}

/* ============================================================
   按钮
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px;
  font-size: 0.92rem;
  font-weight: 600;
  border-radius: 10px;
  border: 1px solid transparent;
  transition: all .2s;
}
.btn-primary {
  color: var(--on-accent);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 6px 16px -6px var(--accent);
}
.btn-primary:hover { color: var(--on-accent); transform: translateY(-1px); box-shadow: 0 10px 22px -8px var(--accent); }
.btn-ghost { color: var(--text); background: var(--bg-elev); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

.link-btn {
  margin-top: 8px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
}
.link-btn:hover { color: var(--accent-2); }

/* ============================================================
   内容区
   ============================================================ */
.content { min-width: 0; }
.section { padding-bottom: 56px; }
.js .section {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .6s ease, transform .6s ease;
}
.js .section.visible { opacity: 1; transform: none; }

.section-head { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; }
.section-title {
  position: relative;
  font-family: var(--font-serif);
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 20px;
  padding-left: 16px;
  letter-spacing: -0.01em;
}
.section-title::before {
  content: "";
  position: absolute;
  left: 0; top: 0.25em; bottom: 0.25em;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
}
.sub-title {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin: 0 0 14px;
}
.muted-link { font-size: 0.9rem; color: var(--text-2); }
.muted-link:hover { color: var(--accent); }
.note { margin: -8px 0 16px; font-size: 0.85rem; color: var(--text-3); }

.prose p { margin: 0 0 14px; color: var(--text-2); }
.prose strong { color: var(--text); font-weight: 600; }

.interests { margin-top: 28px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag {
  padding: 6px 14px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all .2s;
}
.tag:hover { border-color: var(--accent); color: var(--accent); }

/* ---------------- News ---------------- */
.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li {
  display: grid;
  grid-template-columns: 84px 1fr;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  color: var(--text-2);
  font-size: 0.96rem;
}
.news-list li:last-child { border-bottom: 0; }
.news-list time {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--accent);
  padding-top: 1px;
}
.news-list strong { color: var(--text); }
.news-extra { display: none !important; }
.news-list.expanded .news-extra { display: grid !important; }
.new-badge {
  display: inline-block;
  margin-right: 6px;
  padding: 0 7px;
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.6;
  color: #fff;
  background: #ef4444;
  border-radius: 4px;
  vertical-align: 1px;
}

/* ---------------- Publications ---------------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip {
  padding: 6px 14px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-2);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: all .2s;
}
.chip:hover { color: var(--accent); border-color: var(--accent); }
.chip.active {
  color: var(--on-accent);
  background: var(--accent);
  border-color: var(--accent);
}

.pub-list { display: flex; flex-direction: column; gap: 16px; }
.pub {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  align-items: start;
  gap: 22px;
  padding: 18px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.pub:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}
.pub.hidden { display: none; }
.pub-compact { grid-template-columns: minmax(0, 1fr); padding: 16px 18px; }

.pub-thumb {
  position: relative;
  aspect-ratio: 16 / 10;
  border-radius: 10px;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--border);
}
.pub-thumb img { width: 100%; height: 100%; object-fit: contain; display: block; transition: transform .4s; }
.pub:hover .pub-thumb img { transform: scale(1.03); }
.venue-inline {
  display: inline-block;
  margin-right: 8px;
  padding: 0 8px;
  font-size: 0.72rem;
  font-weight: 700;
  line-height: 1.8;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 5px;
  vertical-align: 2px;
  white-space: nowrap;
}
.venue-badge {
  position: absolute;
  left: 8px; top: 8px;
  padding: 2px 9px;
  font-size: 0.74rem;
  font-weight: 700;
  color: #fff;
  background: rgba(15, 23, 42, 0.72);
  backdrop-filter: blur(6px);
  border-radius: 6px;
  letter-spacing: 0.02em;
}

.pub-title { font-size: 1.05rem; font-weight: 600; color: var(--text); margin-bottom: 6px; }
.pub-authors { margin: 0 0 4px; font-size: 0.92rem; color: var(--text-2); }
.pub-authors .me { color: var(--text); font-weight: 700; text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; }
.pub-venue { margin: 0 0 8px; font-size: 0.9rem; color: var(--text-2); }
.highlight {
  display: inline-block;
  margin-left: 6px;
  padding: 0 8px;
  font-size: 0.75rem;
  font-weight: 700;
  font-style: normal;
  line-height: 1.7;
  color: #b45309;
  background: #fef3c7;
  border-radius: 4px;
}
[data-theme="dark"] .highlight { color: #fcd34d; background: rgba(252, 211, 77, 0.14); }
.pub-tldr { margin: 0 0 10px; font-size: 0.9rem; color: var(--text-2); }

.pub-links { display: flex; flex-wrap: wrap; gap: 6px; }
.pill {
  padding: 3px 11px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: transparent;
  border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  border-radius: 6px;
  transition: all .2s;
}
.pill:hover, .pill.active { color: var(--on-accent); background: var(--accent); border-color: var(--accent); }

.bibtex {
  position: relative;
  display: none;
  margin: 12px 0 0;
  padding: 14px 16px;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 0.78rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  white-space: pre;
}
.bibtex.open { display: block; animation: fadeIn .25s ease; }
.copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  padding: 2px 10px;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  color: var(--text-2);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: none; } }

/* ---------------- Timeline ---------------- */
.timeline { list-style: none; margin: 0; padding: 0 0 0 20px; border-left: 2px solid var(--border); }
.timeline li { position: relative; padding: 0 0 22px 4px; }
.timeline li:last-child { padding-bottom: 0; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -28px; top: 6px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--bg-elev);
  border: 3px solid var(--accent);
}
.tl-date { font-size: 0.8rem; font-weight: 600; color: var(--accent); font-variant-numeric: tabular-nums; }
.tl-title { font-weight: 600; color: var(--text); }
.tl-sub { font-size: 0.9rem; color: var(--text-2); }

/* ---------------- Contact ---------------- */
.contact {
  padding: 32px;
  margin-bottom: 40px;
  background: linear-gradient(135deg, var(--accent-soft), transparent);
  border: 1px solid var(--border);
  border-radius: 20px;
}
.contact p { margin: 0 0 18px; color: var(--text-2); }
.contact-row { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------------- Footer ---------------- */
.footer {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  padding: 24px 0 40px;
  border-top: 1px solid var(--border);
  font-size: 0.86rem;
  color: var(--text-3);
}
.footer p { margin: 0; }

/* ---------------- Toast ---------------- */
.toast {
  position: fixed;
  left: 50%; bottom: 28px;
  z-index: 100;
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 500;
  color: #fff;
  background: #0f172a;
  border-radius: 10px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 12px);
  transition: all .25s;
}
[data-theme="dark"] .toast { background: var(--accent); color: var(--on-accent); }
.toast.show { opacity: 1; transform: translate(-50%, 0); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
  .layout { grid-template-columns: 250px minmax(0, 1fr); gap: 36px; }
  .pub { grid-template-columns: 180px minmax(0, 1fr); }
  .pub.pub-compact { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 860px) {
  .menu-btn { display: inline-grid; }
  .nav {
    position: absolute;
    top: var(--topbar-h); left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    padding: 8px 16px 16px;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: all .2s;
  }
  .nav.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav a { padding: 10px 12px; }
  .nav a.active::after { display: none; }
  .nav a.active { background: var(--accent-soft); }
  .topbar-actions { margin-left: auto; }

  .layout { grid-template-columns: 1fr; gap: 32px; padding-top: 24px; }
  .profile { position: static; }
}

@media (max-width: 560px) {
  .topbar-inner, .layout { padding-left: 16px; padding-right: 16px; }
  .pub { grid-template-columns: 1fr; gap: 14px; }
  .news-list li { grid-template-columns: 1fr; gap: 0; }
  .section-title { font-size: 1.5rem; }
  .contact { padding: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .js .section { opacity: 1; transform: none; }
}

@media print {
  .topbar, .filters, .pub-links, .toast, .contact-row, .link-btn { display: none !important; }
  .layout { display: block; }
  .js .section { opacity: 1; transform: none; }
  .pub.hidden, .news-extra { display: grid !important; }
}