/* ============================================================
   个人主页
   ============================================================ */
:root {
  --ink: #16161a;
  --ink-2: #3a3a42;
  --ink-3: #6b6b75;
  --muted: #93939d;
  --line: #e6e5e0;
  --line-2: #f1f0ec;
  --bg: #fbfaf7;
  --paper: #ffffff;
  --accent: #1d4e6f;
  --accent-2: #2f7d8c;
  --accent-soft: #eef4f8;
  --radius: 10px;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --serif: "Source Han Serif SC", "Noto Serif SC", "Songti SC", SimSun, Georgia, serif;
  --mono: "SFMono-Regular", Consolas, monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--sans); font-size: 16px; line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* -------------------------------------------------- 顶栏 */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  transition: background .25s, border-color .25s, backdrop-filter .25s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(251, 250, 247, .86);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
}
.nav-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 32px;
  height: 62px; display: flex; align-items: center; justify-content: space-between;
}
.nav-brand { font-size: 15px; font-weight: 600; letter-spacing: .14em; }
.nav-links { display: flex; gap: 2px; }
.nav-links a {
  font-size: 13.5px; color: var(--ink-3); padding: 6px 13px; border-radius: 999px;
  transition: color .16s, background .16s;
}
.nav-links a:hover { color: var(--ink); background: var(--line-2); }
.nav-links a.cur { color: var(--accent); background: var(--accent-soft); font-weight: 500; }

/* -------------------------------------------------- Hero */
.hero {
  position: relative; overflow: hidden;
  max-width: 1080px; margin: 0 auto; padding: 168px 32px 96px;
}
.hero::before {
  content: ""; position: absolute; inset: 0 -40% auto -20%; height: 620px;
  background:
    radial-gradient(58% 62% at 74% 12%, rgba(47, 125, 140, .10), transparent 62%),
    radial-gradient(52% 56% at 12% 4%, rgba(29, 78, 111, .08), transparent 60%);
  pointer-events: none; z-index: 0;
}
.hero-inner { position: relative; z-index: 1; max-width: 660px; }
.hero-eyebrow {
  font-size: 12px; letter-spacing: .16em; color: var(--accent);
  margin: 0 0 20px; display: flex; flex-direction: column; gap: 2px;
}
.hero-eyebrow span { display: block; }
.hero-name {
  font-family: var(--serif);
  font-size: 58px; line-height: 1.16; font-weight: 600; letter-spacing: .02em;
  margin: 0 0 14px;
}
.hero-name-en {
  display: block; font-family: var(--sans); font-size: 13px;
  font-weight: 400; letter-spacing: .22em; color: var(--muted);
  text-transform: uppercase; margin-top: 14px;
}
.hero-tagline {
  font-size: 18px; color: var(--ink-2); margin: 0 0 34px; line-height: 1.7;
}
.hero-links { display: flex; gap: 11px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 20px; border-radius: 999px; font-size: 13.8px;
  border: 1px solid var(--line); background: var(--paper); color: var(--ink-2);
  transition: transform .16s, border-color .16s, background .16s, color .16s;
}
.btn:hover { transform: translateY(-1px); border-color: #d3d2cb; color: var(--ink); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #17435f; border-color: #17435f; color: #fff; }

.hero-mark {
  position: absolute; right: 32px; top: 190px; z-index: 0;
  font-family: var(--serif); color: rgba(29, 78, 111, .10);
  text-align: right; pointer-events: none; user-select: none;
}
.mark-eq { display: block; font-size: 52px; line-height: 1.1; }
.mark-sub { display: block; font-size: 30px; margin-top: 6px; }

/* -------------------------------------------------- 区块 */
.sec { max-width: 1080px; margin: 0 auto; padding: 0 32px; }
.sec + .sec { margin-top: 8px; }
.sec-head {
  display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap;
  padding-top: 64px; margin-bottom: 26px;
  border-top: 1px solid var(--line);
}
.sec-num {
  font-size: 11px; letter-spacing: .12em; color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.sec-head h2 {
  font-family: var(--serif);
  font-size: 26px; font-weight: 600; margin: 0; letter-spacing: .01em;
}
.sec-sub {
  font-size: 11px; letter-spacing: .14em; color: var(--muted);
  text-transform: uppercase; margin-left: auto;
}
.sec-body { padding-bottom: 12px; }

/* 关于 */
.about { max-width: 720px; }
.lede {
  font-family: var(--serif); font-size: 17px; line-height: 1.95;
  color: var(--ink-2); margin: 0 0 16px;
}
.lede:last-of-type { margin-bottom: 0; }
.body-p {
  font-size: 15px; line-height: 1.95; color: var(--ink-2); margin: 0 0 12px;
}
.body-p a { color: var(--accent); border-bottom: 1px solid rgba(29, 78, 111, .28); }
.body-p a:hover { border-bottom-color: var(--accent); }
.body-p-sm { font-size: 13.4px; color: var(--ink-3); }
.gap { height: 26px; }
.dot-sep { color: var(--muted); margin: 0 .5em; }

/* 关于里的两个站址 */
.addr { margin: 26px 0 0; border-top: 1px solid var(--line-2); }
.addr-row {
  display: flex; align-items: baseline; gap: 14px;
  padding: 12px 4px; border-bottom: 1px solid var(--line-2);
  transition: background .16s, padding-left .16s;
}
.addr-row:hover { background: rgba(29, 78, 111, .028); padding-left: 10px; }
.addr-k {
  flex: 0 0 62px; font-size: 11px; letter-spacing: .1em;
  color: var(--muted); text-transform: uppercase;
}
.addr-v {
  font-family: var(--mono); font-size: 13.4px; color: var(--ink-2); word-break: break-all;
}
.addr-a { margin-left: auto; font-size: 12px; color: var(--muted); }
.addr-row:hover .addr-a { color: var(--accent); }

.fill-note {
  font-size: 12.5px; color: var(--muted); line-height: 1.7;
  margin: 0 0 30px; padding-left: 11px; border-left: 2px solid var(--line);
}
.interests {
  list-style: none; margin: 34px 0 0; padding: 0;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px 40px;
}
.interests li { padding: 15px 0; border-top: 1px solid var(--line-2); }
.i-t {
  display: block; font-size: 15px; font-weight: 600; color: var(--ink); margin-bottom: 3px;
}
.i-d { display: block; font-size: 13.2px; color: var(--ink-3); line-height: 1.65; }

/* -------------------------------------------------- 书卡 */
.book {
  display: grid; grid-template-columns: 208px minmax(0, 1fr); gap: 38px;
  padding: 26px; border-radius: 14px;
  background: var(--paper); border: 1px solid var(--line);
  transition: border-color .2s, box-shadow .2s, transform .2s;
}
.book:hover {
  border-color: #d5d4cc;
  box-shadow: 0 10px 34px rgba(20, 30, 45, .07);
  transform: translateY(-2px);
}
.book-cover { position: relative; }
.book-cover img {
  width: 100%; border-radius: 8px;
  box-shadow: 0 8px 28px rgba(25, 35, 55, .18);
  border: 1px solid rgba(0, 0, 0, .06);
}
.book-badge {
  position: absolute; left: 0; bottom: 12px;
  background: rgba(22, 22, 26, .82); color: #fff;
  font-size: 11px; letter-spacing: .08em; padding: 4px 10px;
  border-radius: 0 999px 999px 0;
  backdrop-filter: blur(6px);
}
.book-info { display: flex; flex-direction: column; min-width: 0; padding: 6px 0; }
.book-title {
  font-family: var(--serif); font-size: 25px; font-weight: 600;
  margin: 0 0 6px; letter-spacing: .01em; line-height: 1.4;
}
.book-en {
  font-size: 11.5px; letter-spacing: .1em; color: var(--muted);
  text-transform: uppercase; margin: 0 0 16px;
}
.book-desc { font-size: 14.2px; line-height: 1.85; color: var(--ink-2); margin: 0 0 20px; }
.book-stats { display: flex; gap: 26px; margin: 0 0 22px; flex-wrap: wrap; }
.stat { display: flex; align-items: baseline; gap: 5px; }
.stat-n { font-family: var(--serif); font-size: 22px; font-weight: 600; color: var(--accent); }
.stat-u { font-size: 12px; color: var(--muted); }
.book-actions { margin-top: auto; display: flex; gap: 26px; flex-wrap: wrap; }
.book-cta {
  font-size: 13.8px; font-weight: 500; color: var(--accent);
  display: inline-flex; align-items: center; gap: 6px;
}
.arrow { transition: transform .2s; display: inline-block; }
.book-cta:hover .arrow { transform: translateX(4px); }

/* -------------------------------------------------- 研究 / 方向 */
.dir-grid {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px;
  margin-bottom: 22px;
}
.dir {
  padding: 22px 24px; border: 1px solid var(--line); border-radius: 12px;
  background: var(--paper); transition: border-color .2s, box-shadow .2s;
}
.dir:hover { border-color: #d5d4cc; box-shadow: 0 8px 26px rgba(20, 30, 45, .05); }
.dir-head { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.dir-head h3 {
  font-family: var(--serif); font-size: 19px; font-weight: 600; margin: 0; letter-spacing: .01em;
}
.dir-en { font-size: 11px; letter-spacing: .1em; color: var(--muted); text-transform: uppercase; }
.dir-d { font-size: 14px; line-height: 1.85; color: var(--ink-2); margin: 0 0 14px; }
.tags { list-style: none; display: flex; flex-wrap: wrap; gap: 7px; margin: 0; padding: 0; }
.tags li {
  font-size: 12.2px; color: var(--accent); background: var(--accent-soft);
  padding: 3px 10px; border-radius: 999px;
}

/* 工具箱 */
.toolbox {
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 40px;
  margin: 30px 0 10px; padding: 18px 0; border-top: 1px solid var(--line-2);
  border-bottom: 1px solid var(--line-2);
}
.tool { display: flex; gap: 12px; align-items: baseline; padding: 4px 0; }
.tool-t {
  flex: 0 0 auto; font-size: 12.5px; font-weight: 600; color: var(--ink-2);
  letter-spacing: .02em;
}
.tool-d { font-size: 13.2px; color: var(--ink-3); line-height: 1.75; }

/* 论文 */
.sub-h {
  display: flex; align-items: baseline; gap: 12px;
  font-family: var(--serif); font-size: 20px; font-weight: 600;
  margin: 40px 0 4px; letter-spacing: .01em;
}
.sub-h-en {
  font-family: var(--sans); font-size: 11px; letter-spacing: .14em;
  color: var(--muted); text-transform: uppercase; font-weight: 400;
}
.p-list { display: flex; flex-direction: column; }
.paper {
  display: grid; grid-template-columns: 300px minmax(0, 1fr); gap: 34px;
  padding: 28px 0; border-top: 1px solid var(--line-2);
}
.paper-fig { margin: 0; }
.paper-fig img {
  width: 100%; border-radius: 10px; background: var(--paper);
  border: 1px solid var(--line);
}
.paper-fig figcaption {
  font-size: 11.8px; color: var(--muted); line-height: 1.65; margin-top: 10px;
}
.paper-body { min-width: 0; }
.paper-venue {
  font-size: 11.5px; letter-spacing: .09em; color: var(--accent);
  text-transform: uppercase; margin: 0 0 10px;
}
.paper-title {
  font-family: var(--serif); font-size: 21px; font-weight: 600;
  line-height: 1.5; margin: 0 0 7px; letter-spacing: .01em;
}
.paper-en { font-size: 13px; color: var(--ink-3); line-height: 1.6; margin: 0 0 16px; }
.paper-meta {
  font-size: 12.8px; color: var(--ink-3); line-height: 1.8; margin: 0 0 4px;
  display: flex; gap: 10px; align-items: baseline;
}
.pm-label {
  flex: 0 0 30px; font-size: 10.8px; letter-spacing: .08em;
  color: var(--muted); text-transform: uppercase;
}
.paper-abs {
  font-size: 14px; line-height: 1.9; color: var(--ink-2);
  margin: 16px 0 0; padding-top: 16px; border-top: 1px dashed var(--line);
}
.paper-links { display: flex; gap: 20px; margin-top: 16px; }
.paper-links a {
  font-size: 13px; color: var(--accent); display: inline-flex; align-items: center; gap: 5px;
}
.paper-links a:hover .arrow { transform: translate(2px, -2px); }
.paper-links .arrow:hover { transform: none; }

/* -------------------------------------------------- 写作 */
.w-list { display: flex; flex-direction: column; }
.w-item {
  display: grid; grid-template-columns: 104px minmax(0, 1fr); gap: 4px 20px;
  padding: 18px 4px; border-top: 1px solid var(--line-2);
  transition: background .16s;
}
.w-item:hover { background: rgba(29, 78, 111, .022); }
.w-date {
  grid-row: span 2; font-size: 12px; color: var(--muted);
  font-variant-numeric: tabular-nums; padding-top: 3px; letter-spacing: .02em;
}
.w-title { font-size: 16px; font-weight: 600; color: var(--ink); }
.w-item:hover .w-title { color: var(--accent); }
.w-desc { font-size: 13.4px; color: var(--ink-3); line-height: 1.7; }
.empty {
  padding: 30px 22px; border: 1px dashed var(--line); border-radius: var(--radius);
  background: rgba(255, 255, 255, .55);
  font-size: 13.8px; color: var(--ink-3);
}
.empty-hint { display: block; margin-top: 8px; font-size: 12.4px; color: var(--muted); line-height: 1.7; }
.empty code {
  font-family: var(--mono); font-size: 11.8px;
  background: var(--line-2); padding: 1px 5px; border-radius: 4px; color: var(--ink-2);
}

/* -------------------------------------------------- 联系 */
.contact-note { margin-bottom: 20px; max-width: 700px; }
.c-list { display: flex; flex-wrap: wrap; gap: 10px; }
.c-item {
  display: flex; flex-direction: column; gap: 2px; position: relative;
  padding: 13px 22px; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--paper); min-width: 190px; text-align: left;
  font-family: inherit; font-size: inherit; color: inherit; cursor: pointer;
  transition: border-color .16s, transform .16s, background .16s;
}
a.c-item:hover, button.c-item:hover { border-color: #d3d2cb; transform: translateY(-1px); }
.c-label { font-size: 11px; letter-spacing: .1em; color: var(--muted); text-transform: uppercase; }
.c-value { font-size: 14px; color: var(--ink-2); }
.c-hint {
  position: absolute; right: 12px; bottom: 8px;
  font-size: 10.5px; color: var(--muted); opacity: 0; transition: opacity .16s;
}
.c-copy:hover .c-hint { opacity: 1; }
.c-copy.copied { border-color: var(--accent); background: var(--accent-soft); }
.c-copy.copied .c-hint { opacity: 1; color: var(--accent); }
.c-pending { opacity: .62; border-style: dashed; cursor: default; }

/* -------------------------------------------------- 页脚 */
.foot { margin-top: 90px; border-top: 1px solid var(--line); }
.foot-inner {
  max-width: 1080px; margin: 0 auto; padding: 30px 32px 46px;
  display: flex; gap: 9px; align-items: center; flex-wrap: wrap;
  font-size: 12.4px; color: var(--muted);
}
.foot-inner a { color: var(--ink-3); }
.foot-inner a:hover { color: var(--accent); }
.dot { color: #cfcec9; }

/* -------------------------------------------------- 响应式 */
@media (max-width: 960px) {
  .paper { grid-template-columns: 240px minmax(0, 1fr); gap: 26px; }
  .toolbox { grid-template-columns: 1fr; gap: 0; }
}
@media (max-width: 860px) {
  .hero { padding: 132px 22px 66px; }
  .hero-name { font-size: 44px; }
  .hero-mark { display: none; }
  .sec { padding: 0 22px; }
  .sec-head { padding-top: 48px; }
  .book { grid-template-columns: 148px minmax(0, 1fr); gap: 24px; padding: 18px; }
  .book-title { font-size: 21px; }
  .book-stats { gap: 18px; }
  .interests { grid-template-columns: 1fr; gap: 0; }
  .dir-grid { grid-template-columns: 1fr; }
  .paper { grid-template-columns: 1fr; gap: 18px; }
  .paper-fig { max-width: 380px; }
  .nav-inner { padding: 0 22px; height: 56px; }
  .foot-inner { padding: 26px 22px 40px; }
}
@media (max-width: 620px) {
  .hero-name { font-size: 36px; }
  .hero-tagline { font-size: 16px; }
  .nav-links a { padding: 6px 9px; font-size: 12.8px; }
  .book { grid-template-columns: 1fr; }
  .book-cover { max-width: 168px; display: block; }
  .book-actions { gap: 16px; }
  .w-item { grid-template-columns: 1fr; }
  .w-date { grid-row: auto; }
  .c-item { min-width: 0; flex: 1 1 100%; }
  .addr-k { flex-basis: 48px; }
  .tool { flex-direction: column; gap: 2px; }
}