:root {
  --ink: #1c1a17;
  --ink-soft: #4c463d;
  --paper: #faf8f3;
  --paper-deep: #f1ece1;
  --gold: #b08d4f;
  --gold-deep: #8f6f37;
  --line: rgba(28, 26, 23, 0.14);
  --dark: #16140f;
  --dark-soft: #201d16;
  --white: #fffdf8;
  --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow: 0 24px 60px -28px rgba(28, 26, 23, 0.35);
}

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

html { scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }

.container { width: min(1120px, 92%); margin: 0 auto; }

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  background: rgba(250, 248, 243, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}
.site-header.scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 30px -20px rgba(28, 26, 23, 0.3);
}
.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.brand .brand-dot { color: var(--gold); }
.brand small {
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--ink-soft);
  margin-left: 10px;
}
.main-nav {
  display: flex;
  gap: 34px;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
}
.main-nav a { position: relative; color: var(--ink-soft); transition: color 0.25s; }
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -5px;
  width: 0; height: 1px;
  background: var(--gold);
  transition: width 0.3s;
}
.main-nav a:hover, .main-nav a.active { color: var(--ink); }
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--ink);
  transition: transform 0.3s, opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  color: var(--white);
  background: var(--dark);
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 480px at 78% 18%, rgba(176, 141, 79, 0.18), transparent 60%),
    radial-gradient(720px 520px at 8% 88%, rgba(176, 141, 79, 0.10), transparent 60%),
    linear-gradient(160deg, #191712 0%, #13110d 100%);
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 64px;
  align-items: center;
}
.eyebrow {
  font-size: 0.78rem;
  letter-spacing: 0.32em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 18px;
}
.hero-name {
  font-family: var(--serif);
  font-size: clamp(3.6rem, 8vw, 6rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}
.hero-title {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  letter-spacing: 0.14em;
  color: #e9e2d2;
  margin-bottom: 26px;
}
.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 38px;
}
.hero-tags span {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: #d8cdb6;
  border: 1px solid rgba(216, 205, 182, 0.35);
  border-radius: 999px;
  padding: 7px 16px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  font-size: 0.92rem;
  letter-spacing: 0.14em;
  padding: 13px 30px;
  border-radius: 2px;
  transition: all 0.3s;
  cursor: pointer;
}
.btn-solid {
  background: var(--gold);
  color: #fff;
  border: 1px solid var(--gold);
}
.btn-solid:hover { background: var(--gold-deep); border-color: var(--gold-deep); }
.btn-ghost {
  border: 1px solid rgba(28, 26, 23, 0.35);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--ink); background: rgba(28, 26, 23, 0.05); }
.hero .btn-ghost { border-color: rgba(255, 253, 248, 0.4); color: var(--white); }
.hero .btn-ghost:hover { border-color: var(--white); background: rgba(255, 255, 255, 0.06); }

.hero-figure {
  position: relative;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 44px 90px -34px rgba(0, 0, 0, 0.75);
  border: 1px solid rgba(255, 253, 248, 0.14);
}
.hero-figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 62%, rgba(12, 10, 7, 0.72));
}
.hero-figure img { width: 100%; height: 100%; object-fit: cover; }
.hero-figure figcaption {
  position: absolute;
  left: 18px; right: 18px; bottom: 16px;
  z-index: 1;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: #efe7d6;
}
.scroll-hint {
  position: absolute;
  left: 50%; bottom: 28px;
  transform: translateX(-50%);
  width: 24px; height: 40px;
  border: 1px solid rgba(255, 253, 248, 0.45);
  border-radius: 999px;
}
.scroll-hint span {
  position: absolute;
  left: 50%; top: 8px;
  width: 3px; height: 8px;
  margin-left: -1.5px;
  border-radius: 2px;
  background: var(--gold);
  animation: scrollDot 1.8s ease-in-out infinite;
}
@keyframes scrollDot {
  0% { transform: translateY(0); opacity: 1; }
  70% { transform: translateY(14px); opacity: 0; }
  100% { transform: translateY(0); opacity: 0; }
}

/* ---------- Stats ---------- */
.stats {
  background: var(--paper-deep);
  border-bottom: 1px solid var(--line);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  text-align: center;
  padding: 40px 18px;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: 0; }
.stat b {
  display: block;
  font-family: var(--serif);
  font-size: 2rem;
  font-weight: 700;
  color: var(--gold-deep);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.stat span { font-size: 0.88rem; color: var(--ink-soft); letter-spacing: 0.08em; }

/* ---------- Sections ---------- */
.section { padding: 110px 0; }
.section-title {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.4vw, 2.45rem);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.45;
  margin-bottom: 48px;
}

/* ---------- About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: start;
}
.tab-bar {
  display: inline-flex;
  gap: 4px;
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px;
  margin-bottom: 26px;
}
.tab {
  border: 0;
  background: transparent;
  font-family: var(--sans);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
  padding: 9px 22px;
  border-radius: 999px;
  cursor: pointer;
  transition: all 0.3s;
}
.tab.active {
  background: var(--ink);
  color: var(--white);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.45s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
.tab-panel p {
  font-size: 1.02rem;
  text-align: justify;
  color: var(--ink-soft);
}
.tab-panel p em { color: var(--ink); font-style: normal; }
.bio-count {
  display: inline-block;
  margin-top: 18px;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.about-card {
  background: var(--dark);
  color: var(--white);
  border-radius: 4px;
  padding: 40px 34px;
  box-shadow: var(--shadow);
}
.about-card dl div {
  padding: 18px 0;
  border-bottom: 1px solid rgba(255, 253, 248, 0.12);
}
.about-card dl div:first-child { padding-top: 0; }
.about-card dl div:last-child { border-bottom: 0; padding-bottom: 0; }
.about-card dt {
  font-size: 0.74rem;
  letter-spacing: 0.28em;
  color: var(--gold);
  margin-bottom: 8px;
}
.about-card dd {
  font-size: 1rem;
  line-height: 1.8;
  color: #ece5d4;
}

/* ---------- Timeline ---------- */
.career { background: var(--paper-deep); }
.timeline { position: relative; max-width: 860px; margin: 0 auto; }
.timeline::before {
  content: "";
  position: absolute;
  left: 27px; top: 10px; bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(176, 141, 79, 0.15));
}
.timeline-item {
  position: relative;
  padding-left: 92px;
  padding-bottom: 72px;
}
.timeline-item:last-child { padding-bottom: 0; }
.tl-marker {
  position: absolute;
  left: 0; top: 0;
  width: 55px; height: 55px;
  border-radius: 50%;
  background: var(--paper);
  border: 1px solid var(--gold);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 6px var(--paper-deep);
}
.tl-marker span {
  font-family: var(--serif);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gold-deep);
  letter-spacing: 0.08em;
}
.tl-period {
  font-size: 0.8rem;
  letter-spacing: 0.26em;
  color: var(--gold-deep);
  margin-bottom: 10px;
}
.tl-body h3 {
  font-family: var(--serif);
  font-size: 1.45rem;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
}
.tl-body > p {
  color: var(--ink-soft);
  margin-bottom: 12px;
  text-align: justify;
}
.tl-list {
  margin: 18px 0 22px;
  padding: 22px 26px;
  background: var(--paper);
  border-left: 3px solid var(--gold);
  border-radius: 0 4px 4px 0;
}
.tl-list li {
  position: relative;
  color: var(--ink-soft);
  padding-left: 20px;
  margin-bottom: 10px;
}
.tl-list li:last-child { margin-bottom: 0; }
.tl-list li::before {
  content: "";
  position: absolute;
  left: 0; top: 0.78em;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--gold);
}
.tl-figure {
  margin: 22px 0;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.tl-figure figcaption, .science-figure figcaption {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  background: var(--paper);
  padding: 12px 18px;
}
blockquote {
  font-family: var(--serif);
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--ink);
  border-left: 3px solid var(--gold);
  background: rgba(176, 141, 79, 0.08);
  padding: 20px 24px;
  margin: 22px 0 4px;
  border-radius: 0 4px 4px 0;
}

/* ---------- Science ---------- */
.science {
  background: var(--dark);
  color: var(--white);
}
.science .section-title { color: var(--white); }
.science .eyebrow { color: var(--gold); }
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 48px;
}
.chips span {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: #d8cdb6;
  border: 1px solid rgba(216, 205, 182, 0.3);
  border-radius: 999px;
  padding: 8px 18px;
}
.science-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 56px;
}
.sc-card {
  background: var(--dark-soft);
  border: 1px solid rgba(255, 253, 248, 0.1);
  border-radius: 4px;
  padding: 34px 30px;
  transition: transform 0.3s, border-color 0.3s;
}
.sc-card:hover { transform: translateY(-5px); border-color: rgba(176, 141, 79, 0.55); }
.sc-card b {
  font-family: var(--serif);
  font-size: 0.9rem;
  color: var(--gold);
  letter-spacing: 0.2em;
}
.sc-card h3 {
  font-family: var(--serif);
  font-size: 1.22rem;
  margin: 12px 0 10px;
  letter-spacing: 0.04em;
}
.sc-card p { color: #bdb39e; font-size: 0.95rem; }
.science-figure {
  max-width: 760px;
  margin: 0 auto;
  border-radius: 4px;
  overflow: hidden;
  border: 1px solid rgba(255, 253, 248, 0.14);
}
.science-figure figcaption {
  background: var(--dark-soft);
  color: #d8cdb6;
}

/* ---------- News ---------- */
.section-note { color: var(--ink-soft); margin: -26px 0 34px; font-size: 0.92rem; }
.news-list {
  border-top: 1px solid var(--line);
}
.news-list li { border-bottom: 1px solid var(--line); }
.news-list a {
  display: grid;
  grid-template-columns: 110px 1fr auto;
  gap: 22px;
  align-items: baseline;
  padding: 24px 8px;
  transition: background 0.3s, padding-left 0.3s;
}
.news-list a:hover { background: var(--paper-deep); padding-left: 18px; }
.nl-date {
  font-family: var(--serif);
  color: var(--gold-deep);
  font-weight: 700;
  letter-spacing: 0.08em;
}
.nl-title { font-weight: 600; letter-spacing: 0.03em; }
.nl-src {
  font-size: 0.8rem;
  color: var(--ink-soft);
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.news-extra {
  margin-top: 40px;
  padding: 28px 32px;
  background: var(--paper-deep);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 26px;
  flex-wrap: wrap;
}
.news-extra p { color: var(--ink-soft); font-size: 0.94rem; max-width: 680px; text-align: justify; }
.news-extra strong { color: var(--ink); }

/* ---------- Contact ---------- */
.contact {
  background:
    radial-gradient(700px 380px at 85% 10%, rgba(176, 141, 79, 0.12), transparent 60%),
    var(--paper-deep);
}
.contact-inner { text-align: center; max-width: 760px; }
.contact .section-title { margin-bottom: 20px; }
.contact p { color: var(--ink-soft); }
.contact-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 34px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--dark);
  color: #9c927c;
  padding: 34px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.84rem;
  letter-spacing: 0.1em;
}
.footer-domain { font-family: var(--serif); color: var(--gold); letter-spacing: 0.22em; }

/* ---------- Reveal animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .scroll-hint span { animation: none; }
}

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .hero-grid { grid-template-columns: 1fr; gap: 48px; }
  .hero { padding-top: 130px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: 0; }
  .stat:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .about-grid { grid-template-columns: 1fr; }
  .section { padding: 84px 0; }
  .science-grid { grid-template-columns: 1fr; }
  .news-list a { grid-template-columns: 90px 1fr; }
  .nl-src { grid-column: 2; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: fixed;
    top: 72px; left: 0; right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    padding: 10px 6vw 18px;
    transform: translateY(-110%);
    transition: transform 0.35s ease;
    box-shadow: 0 26px 40px -28px rgba(28, 26, 23, 0.4);
  }
  .main-nav.open { transform: translateY(0); }
  .main-nav a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .main-nav a:last-child { border-bottom: 0; }
  .brand small { display: none; }
  .hero-name { font-size: 3.1rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat { padding: 28px 10px; }
  .stat b { font-size: 1.55rem; }
  .timeline-item { padding-left: 66px; }
  .timeline::before { left: 19px; }
  .tl-marker { width: 40px; height: 40px; }
  .tl-list { padding: 18px; }
  .section-title { margin-bottom: 34px; }
  .footer-inner { flex-direction: column; gap: 6px; text-align: center; }
}