/* =========================================================
   Bingbing Xu — 个人主页样式
   手写 CSS，无构建步骤。改配色只需调下面这组变量。
   ========================================================= */

:root {
  /* 主色：深青绿，区别于常见的学术蓝 */
  --accent: #0f6f6a;
  --accent-hi: #0c5450;
  --accent-wash: #e8f2f1;

  /* 暖调中性色，而非纯灰 */
  --bg: #fbfaf8;
  --panel: #ffffff;
  --fg: #22201d;
  --fg-mid: #5f5a54;
  --fg-dim: #8c857d;
  --line: #e3ded7;

  /* News 各类别的标记色 */
  --k-paper: #0f6f6a;
  --k-award: #b4791c;
  --k-service: #5a5fa8;
  --k-misc: #8c857d;

  --radius: 12px;
  --rail-w: 268px;
  --page-w: 1140px;

  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  --serif: "Charter", "Iowan Old Style", Georgia, "Songti SC", serif;
}

html.dark {
  --accent: #5fbdb4;
  --accent-hi: #86d4cb;
  --accent-wash: #16302f;

  --bg: #16171a;
  --panel: #1d1f23;
  --fg: #e8e6e3;
  --fg-mid: #a7a29b;
  --fg-dim: #7d776f;
  --line: #2f3238;

  --k-paper: #5fbdb4;
  --k-award: #d6a24e;
  --k-service: #9298e0;
  --k-misc: #7d776f;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 15.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- 顶部导航 ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 0 28px;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  font-family: var(--serif);
  font-size: 1.12rem;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.tabs {
  display: flex;
  gap: 4px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }

.tabs a {
  position: relative;
  padding: 6px 13px;
  border-radius: 7px;
  color: var(--fg-mid);
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  transition: color .15s, background .15s;
}
.tabs a:hover { color: var(--fg); background: var(--accent-wash); text-decoration: none; }
.tabs a.on { color: var(--accent); font-weight: 650; }
.tabs a.on::after {
  content: "";
  position: absolute;
  left: 13px; right: 13px; bottom: -1px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px 2px 0 0;
}

#theme-toggle {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px; height: 32px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: transparent;
  color: var(--fg-mid);
  cursor: pointer;
  transition: color .15s, border-color .15s;
}
#theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
#theme-toggle svg { width: 16px; height: 16px; }
#theme-toggle .hidden { display: none; }

/* ---------- 双栏骨架 ---------- */

.shell {
  max-width: var(--page-w);
  margin: 0 auto;
  padding: 40px 28px 0;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

/* ---------- 左侧资料栏 ---------- */

.rail {
  position: sticky;
  top: 88px;
}

.rail-photo {
  width: 132px;
  height: 132px;
  border-radius: 18px;
  object-fit: cover;
  border: 1px solid var(--line);
  display: block;
}

.rail-photo-blank {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-wash);
  color: var(--accent);
  font-family: var(--serif);
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  user-select: none;
}

.rail-name {
  margin: 16px 0 0;
  font-family: var(--serif);
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.015em;
}
.rail-zh {
  margin: 2px 0 0;
  color: var(--fg-mid);
  font-size: 1rem;
}
.rail-title {
  margin: 10px 0 0;
  color: var(--accent);
  font-size: .95rem;
  font-weight: 650;
}
.rail-affil {
  margin: 4px 0 0;
  color: var(--fg-mid);
  font-size: .86rem;
  line-height: 1.5;
}

.rail-meta {
  list-style: none;
  margin: 18px 0 0;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 9px;
  font-size: .86rem;
}
.rail-meta li {
  display: flex;
  align-items: flex-start;
  gap: 9px;
  color: var(--fg-mid);
}
.rail-meta svg {
  flex: 0 0 auto;
  width: 15px; height: 15px;
  margin-top: 3px;
  color: var(--fg-dim);
}
.rail-meta a { color: var(--fg-mid); }
.rail-meta a:hover { color: var(--accent); }

/* ---------- 内容区 ---------- */

.content { min-width: 0; padding-bottom: 8px; }

section { margin-bottom: 52px; }

h2 {
  margin: 0 0 20px;
  font-family: var(--serif);
  font-size: 1.42rem;
  font-weight: 700;
  letter-spacing: -0.015em;
}

.head-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
}
.head-row h2 { margin: 0; }
.more { font-size: .88rem; white-space: nowrap; }

.lede {
  margin: -8px 0 22px;
  color: var(--fg-mid);
  font-size: .9rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}
.legend { display: inline-flex; align-items: center; gap: 5px; }

.prose p { margin: 0 0 13px; }
.prose p:last-child { margin-bottom: 0; }

.callout {
  margin-top: 22px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--accent-wash);
}
.callout strong {
  display: block;
  margin-bottom: 4px;
  color: var(--accent-hi);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
}
.callout p { margin: 0; font-size: .93rem; }

/* ---------- 代表作大卡片 ---------- */

.card {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 22px;
  padding: 18px;
  margin-bottom: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: border-color .18s, transform .18s;
}
.card:hover { border-color: var(--accent); transform: translateY(-2px); }

.card-visual { position: relative; }
.card-visual a { display: block; }
.card-visual img {
  width: 100%;
  max-height: 210px;
  object-fit: contain;
  border-radius: 8px;
  border: 1px solid var(--line);
  background: #fff;   /* 论文配图都是白底，深色模式下也保持白底以免线条消失 */
  padding: 6px;
  display: block;
}
.card-visual a:hover img { border-color: var(--accent); }

.card-visual-blank {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 118px;
  padding: 10px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent-wash), var(--bg));
  border: 1px dashed var(--line);
}
.card-visual-blank span {
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  line-height: 1.25;
}

.card-badge {
  position: absolute;
  top: 8px; left: 8px;
  padding: 3px 9px;
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  font-size: .71rem;
  font-weight: 700;
  letter-spacing: .03em;
}

.card-body { min-width: 0; }

.card-title {
  margin: 0 0 5px;
  font-size: 1.02rem;
  font-weight: 650;
  line-height: 1.38;
}
.card-title a { color: var(--fg); }
.card-title a:hover { color: var(--accent); }

.card-authors {
  margin: 0 0 8px;
  font-size: .87rem;
  color: var(--fg-mid);
}

.card-tldr {
  margin: 0 0 10px;
  font-size: .89rem;
  color: var(--fg-mid);
  line-height: 1.55;
}

.card-links { display: flex; flex-wrap: wrap; gap: 6px; }
.card-links a {
  padding: 3px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--fg-mid);
  font-size: .8rem;
  transition: color .15s, border-color .15s;
}
.card-links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.me {
  font-weight: 700;
  color: var(--fg);
  border-bottom: 1.5px solid var(--accent);
}

/* ---------- 完整论文列表 ---------- */

.years {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 26px;
}
.years a {
  padding: 3px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--fg-mid);
  font-size: .84rem;
  font-variant-numeric: tabular-nums;
}
.years a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.year {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 34px 0 14px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--line);
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--fg-dim);
  scroll-margin-top: 76px;
}
.year:first-of-type { margin-top: 0; }
.year-count {
  padding: 1px 8px;
  border-radius: 999px;
  background: var(--accent-wash);
  color: var(--accent);
  font-family: var(--sans);
  font-size: .72rem;
  font-weight: 700;
}

.row { padding: 13px 0; border-bottom: 1px solid var(--line); }
.row:last-child { border-bottom: none; }

.row-title { margin: 0 0 3px; font-size: .99rem; font-weight: 650; line-height: 1.4; }
.row-title a { color: var(--fg); }
.row-title a:hover { color: var(--accent); }

.row-authors { margin: 0 0 2px; font-size: .87rem; color: var(--fg-mid); }
.row-venue { margin: 0; font-size: .86rem; color: var(--fg-mid); }
.row-meta { color: var(--fg-dim); }

.kind {
  display: inline-block;
  width: 17px; height: 17px;
  margin-right: 6px;
  border-radius: 4px;
  color: #fff;
  font-size: .67rem;
  font-weight: 700;
  line-height: 17px;
  text-align: center;
  vertical-align: 1px;
}
.kind-c { background: var(--accent); }
.kind-j { background: #7b5ea7; }
.kind-p { background: var(--fg-dim); }

.row-links { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 7px; }
.row-links a {
  padding: 2px 9px;
  border: 1px solid var(--line);
  border-radius: 5px;
  color: var(--fg-mid);
  font-size: .78rem;
}
.row-links a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* ---------- News 时间流 ---------- */

.feed { list-style: none; margin: 0; padding: 0; }

.feed-item {
  position: relative;
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  padding: 11px 0 11px 16px;
  font-size: .92rem;
  border-left: 2px solid var(--line);
}
.feed-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 19px;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--k-misc);
}
.feed-paper::before  { border-color: var(--k-paper); }
.feed-award::before  { border-color: var(--k-award); background: var(--k-award); }
.feed-service::before{ border-color: var(--k-service); }

.feed-date {
  color: var(--fg-dim);
  font-size: .84rem;
  font-variant-numeric: tabular-nums;
  padding-top: 1px;
}
.feed-text { min-width: 0; }
.feed-text strong { color: var(--fg); font-weight: 650; }

.feed-full .feed-item { padding-top: 13px; padding-bottom: 13px; }

/* ---------- CV 页 ---------- */

.track { list-style: none; margin: 0; padding: 0; }
.track li {
  position: relative;
  padding: 0 0 22px 20px;
  border-left: 2px solid var(--line);
}
.track li:last-child { padding-bottom: 0; border-left-color: transparent; }
.track li::before {
  content: "";
  position: absolute;
  left: -6px; top: 7px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
}
.track-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
}
.track-role { font-weight: 650; }
.track-date {
  margin-left: auto;
  color: var(--fg-dim);
  font-size: .85rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.track-org { color: var(--fg-mid); font-size: .91rem; }
.track-note { margin-top: 3px; color: var(--fg-dim); font-size: .87rem; }

.plain { list-style: none; margin: 0; padding: 0; }
.plain li {
  display: flex;
  gap: 14px;
  padding: 8px 0;
  font-size: .93rem;
  border-bottom: 1px dashed var(--line);
}
.plain li:last-child { border-bottom: none; }
.plain-date {
  margin-left: auto;
  color: var(--fg-dim);
  font-size: .85rem;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.defs { margin: 0; }
.defs dt { margin-top: 15px; font-weight: 650; font-size: .93rem; }
.defs dt:first-child { margin-top: 0; }
.defs dd { margin: 2px 0 0; color: var(--fg-mid); font-size: .91rem; }

/* ---------- 页脚 ---------- */

footer {
  margin-top: 56px;
  padding: 18px 0 36px;
  border-top: 1px solid var(--line);
  color: var(--fg-dim);
  font-size: .83rem;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: space-between;
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .shell {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 28px;
  }
  /* 中等屏：照片与身份信息并排，联系方式另起一行占满宽度 */
  .rail {
    position: static;
    padding-bottom: 26px;
    border-bottom: 1px solid var(--line);
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    gap: 0 20px;
  }
  .rail-photo { width: 104px; height: 104px; }
  .rail-ident { flex: 1 1 260px; min-width: 0; }
  .rail-name  { margin-top: 0; }
  .rail-meta  { flex: 1 0 100%; margin-top: 16px; }
}

@media (max-width: 600px) {
  /* 窄屏把导航移到第二行，避免标签被挤掉 */
  .topbar-inner {
    height: auto;
    padding: 9px 16px;
    flex-wrap: wrap;
    gap: 8px 12px;
  }
  .brand { font-size: 1rem; }
  #theme-toggle { margin-left: auto; }
  .tabs {
    order: 3;
    flex: 1 0 100%;
    margin-left: 0;
    gap: 2px;
  }
  .tabs a { padding: 5px 10px; font-size: .88rem; }
  .tabs a.on::after { left: 10px; right: 10px; bottom: -9px; }
  .shell { padding-left: 16px; padding-right: 16px; }

  .card { grid-template-columns: 1fr; gap: 14px; }
  .card-visual img { max-height: 190px; width: 100%; }

  /* 窄屏下改回普通文档流，保证姓名→职称→单位→联系方式的顺序 */
  .rail {
    display: block;
  }
  .rail-name { margin-top: 14px; }
  .rail-meta { margin-top: 16px; }

  .feed-item { grid-template-columns: 1fr; gap: 3px; }
  .track-date { margin-left: 0; width: 100%; }
}

@media print {
  .topbar, #theme-toggle, .more, .years { display: none; }
  .shell { display: block; max-width: none; padding: 0; }
  .rail { position: static; margin-bottom: 24px; }
  .card { break-inside: avoid; border-color: #ccc; }
  body { font-size: 10.5pt; }
}