:root {
  --ict-blue: #003d73;
  --ict-blue-2: #075a9d;
  --ict-blue-3: #eaf3fb;
  --ict-red: #b42318;
  --ink: #1f2937;
  --muted: #667085;
  --line: #d9e2ec;
  --paper: #ffffff;
  --soft: #f5f8fb;
  --shadow: 0 18px 45px rgba(15, 23, 42, .10);
  --radius: 14px;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: #f7f9fc;
  font-family: "Noto Sans SC", "Microsoft YaHei", "PingFang SC", Arial, Helvetica, sans-serif;
  line-height: 1.72;
}
a { color: var(--ict-blue-2); text-decoration: none; }
a:hover { color: var(--ict-red); }
img { max-width: 100%; display: block; }

.lang-en { display: none !important; }
.lang-zh { display: inline !important; }
html[data-lang="en"] .lang-zh { display: none !important; }
html[data-lang="en"] .lang-en { display: inline !important; }
html[data-lang="zh-CN"] .lang-en { display: none !important; }
html[data-lang="zh-CN"] .lang-zh { display: inline !important; }

.topbar {
  background: #022b52;
  color: rgba(255,255,255,.88);
  font-size: 13px;
}
.topbar-inner, .header-inner, .container, .footer-inner {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
}
.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 36px;
  gap: 16px;
}
.top-links { display: flex; flex-wrap: wrap; gap: 18px; }
.top-links a { color: rgba(255,255,255,.88); }
.top-links a:hover { color: #fff; }
.lang-toggle {
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  background: transparent;
  padding: 4px 10px;
  border-radius: 999px;
  cursor: pointer;
  font-size: 12px;
}

.site-header {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 50;
  box-shadow: 0 2px 16px rgba(15, 23, 42, .04);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 84px;
}
.brand { display: flex; align-items: center; gap: 14px; color: var(--ink); }
.brand-mark { width: 54px; height: 54px; flex: 0 0 auto; }
.brand-name { font-weight: 800; font-size: 22px; line-height: 1.18; letter-spacing: .2px; }
.brand-sub { color: var(--muted); font-size: 13px; margin-top: 3px; }
.nav { display: flex; align-items: center; gap: 4px; }
.nav a {
  color: #26364a;
  font-weight: 700;
  padding: 10px 13px;
  border-radius: 10px;
  font-size: 15px;
}
.nav a:hover, .nav a.active { background: var(--ict-blue-3); color: var(--ict-blue); }
.menu-toggle { display: none; border: 0; background: var(--ict-blue); color: #fff; padding: 8px 11px; border-radius: 10px; }

.hero {
  background:
    linear-gradient(120deg, rgba(0, 61, 115, .96), rgba(7, 90, 157, .88)),
    radial-gradient(circle at top right, rgba(255,255,255,.18), transparent 32%);
  color: #fff;
  padding: 58px 0 42px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.5fr .8fr;
  gap: 34px;
  align-items: center;
}
.eyebrow { color: #bfdbfe; font-weight: 800; letter-spacing: .12em; text-transform: uppercase; font-size: 13px; }
.hero h1 { margin: 10px 0 14px; font-size: clamp(32px, 5vw, 55px); line-height: 1.12; }
.hero p { color: rgba(255,255,255,.88); font-size: 18px; margin: 0 0 24px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 18px;
  border-radius: 999px;
  font-weight: 800;
  border: 1px solid transparent;
}
.button.primary { background: #fff; color: var(--ict-blue); }
.button.primary:hover { color: var(--ict-red); }
.button.secondary { color: #fff; border-color: rgba(255,255,255,.45); }
.button.secondary:hover { background: rgba(255,255,255,.12); color: #fff; }
.hero-panel {
  background: rgba(255,255,255,.12);
  border: 1px solid rgba(255,255,255,.22);
  border-radius: 20px;
  padding: 22px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}
.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px; }
.stat {
  background: rgba(255,255,255,.13);
  border-radius: 15px;
  padding: 16px;
}
.stat strong { display: block; font-size: 27px; line-height: 1.1; }
.stat span { color: rgba(255,255,255,.82); font-size: 13px; }
.hero-photo-panel {
  padding: 14px;
  overflow: hidden;
}

.hero-photo {
  margin: 0;
  position: relative;
  border-radius: 17px;
  overflow: hidden;
  background: rgba(255,255,255,.08);
}

.hero-photo img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  object-position: center;
  border-radius: 17px;
}
.hero-photo-panel {
  overflow: hidden;
}

.hero-photo-panel {
  overflow: hidden;
}

.hero-carousel {
  position: relative;
  width: 100%;
  margin: 0;
  overflow: hidden;
  border-radius: 24px;
  background: transparent; /* 不要灰底 */
}

.carousel-track {
  position: relative;
  width: 100%;
  overflow: hidden;
}

.carousel-slide {
  display: none;
  position: relative;
  width: 100%;
}

.carousel-slide.active {
  display: block;
}

.carousel-slide img {
  display: block;
  width: 100%;
  height: auto;      /* 关键：高度自适应 */
  max-width: 100%;
  object-fit: unset; /* 不再用 contain / cover */
  background: transparent;
  border-radius: 24px;
}


.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.55);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  z-index: 5;
  transition: background 0.2s ease, transform 0.2s ease;
}

.carousel-btn:hover {
  background: rgba(15, 23, 42, 0.75);
}

.carousel-prev {
  left: 14px;
}

.carousel-next {
  right: 14px;
}

.carousel-dots {
  position: absolute;
  left: 50%;
  bottom: 46px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
  z-index: 6;
}

.carousel-dots .dot {
  width: 9px;
  height: 9px;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.55);
  cursor: pointer;
  padding: 0;
}

.carousel-dots .dot.active {
  background: #ffffff;
}

.hero-carousel figcaption {
  position: absolute;
  left: 18px;
  bottom: 16px;
  z-index: 6;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.65);
  color: #fff;
  font-size: 14px;
}
.hero-photo figcaption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  display: inline-flex;
  align-items: center;
  padding: 6px 11px;
  border-radius: 999px;
  background: rgba(2, 43, 82, .72);
  color: #fff;
  font-size: 13px;
  font-weight: 800;
  backdrop-filter: blur(8px);
}
.section { padding: 48px 0; }
.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 20px;
  border-bottom: 3px solid var(--ict-blue);
  padding-bottom: 10px;
}
.section-title h2 { margin: 0; color: var(--ict-blue); font-size: 27px; line-height: 1.25; }
.section-title p { margin: 0; color: var(--muted); font-size: 14px; }

.two-col { display: grid; grid-template-columns: 1.55fr .85fr; gap: 24px; align-items: start; }
.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 10px 30px rgba(15, 23, 42, .06);
}
.card-body { padding: 22px; }
.card h3 { margin: 0 0 12px; color: #123a63; font-size: 20px; }
.card p { margin-top: 0; }

.news-list, .publication-list, .people-list { list-style: none; padding: 0; margin: 0; }
.news-list li {
  display: grid;
  grid-template-columns: 92px 1fr;
  gap: 14px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.news-list li:last-child { border-bottom: 0; }
.news-date {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: var(--ict-blue-3);
  color: var(--ict-blue);
  border-radius: 12px;
  min-height: 62px;
  font-weight: 800;
}
.news-date small { font-size: 12px; color: var(--muted); }
.news-title { font-weight: 800; color: #1d3557; }
.news-desc { color: var(--muted); font-size: 14px; margin-top: 2px; }

.side-block + .side-block { margin-top: 18px; }
.tag-list { display: flex; flex-wrap: wrap; gap: 9px; }
.tag {
  background: var(--ict-blue-3);
  color: var(--ict-blue);
  border: 1px solid #c7def1;
  border-radius: 999px;
  padding: 5px 10px;
  font-size: 13px;
  font-weight: 700;
}

.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature-card { padding: 22px; min-height: 210px; }
.feature-icon {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--ict-blue-3);
  display: grid;
  place-items: center;
  color: var(--ict-blue);
  font-weight: 900;
  margin-bottom: 14px;
}

.page-hero {
  background: linear-gradient(120deg, #003d73, #0a67ad);
  color: #fff;
  padding: 42px 0;
}
.page-hero h1 { margin: 0 0 8px; font-size: clamp(30px, 4vw, 44px); }
.page-hero p { margin: 0; color: rgba(255,255,255,.86); font-size: 17px; max-width: 780px; }
.breadcrumb { color: #bfdbfe; font-size: 14px; margin-bottom: 10px; }
.breadcrumb a { color: #fff; }

.teacher-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.teacher-card { padding: 22px; display: grid; grid-template-columns: 72px 1fr; gap: 18px; align-items: start; }
.avatar {
  width: 72px;
  height: 72px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--ict-blue), #4e9bd4);
  color: #fff;
  display: grid;
  place-items: center;
  font-weight: 900;
  font-size: 24px;
}
.role { color: var(--ict-red); font-weight: 800; font-size: 14px; }
.meta { color: var(--muted); font-size: 14px; }

.group-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.people-list li { padding: 10px 0; border-bottom: 1px dashed var(--line); }
.people-list li:last-child { border-bottom: 0; }
.people-name { font-weight: 800; color: #243b53; }

.pub-year { color: var(--ict-blue); font-size: 23px; margin: 28px 0 12px; }
.publication-item {
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}
.publication-item:last-child { border-bottom: 0; }
.pub-title { font-weight: 900; color: #17324d; font-size: 16px; }
.pub-authors { color: var(--muted); font-size: 14px; margin: 4px 0; }
.pub-venue { color: var(--ict-red); font-weight: 800; font-size: 14px; }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.contact-item { display: flex; gap: 14px; padding: 16px 0; border-bottom: 1px solid var(--line); }
.contact-item:last-child { border-bottom: 0; }
.contact-icon { width: 38px; height: 38px; border-radius: 12px; background: var(--ict-blue-3); display: grid; place-items: center; color: var(--ict-blue); font-weight: 900; flex: 0 0 auto; }

.footer {
  background: #092b4d;
  color: rgba(255,255,255,.84);
  margin-top: 48px;
}
.footer-inner { padding: 34px 0; display: grid; grid-template-columns: 1.2fr .8fr; gap: 28px; }
.footer h3 { color: #fff; margin: 0 0 10px; }
.footer a { color: rgba(255,255,255,.88); }
.footer a:hover { color: #fff; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px; }
.copyright { border-top: 1px solid rgba(255,255,255,.13); padding: 16px 0; color: rgba(255,255,255,.65); font-size: 13px; }

@media (max-width: 900px) {
  .header-inner { min-height: 72px; }
  .menu-toggle { display: inline-flex; }
  .nav {
    display: none;
    position: absolute;
    top: 72px;
    left: 18px;
    right: 18px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    padding: 10px;
    flex-direction: column;
    align-items: stretch;
  }
  .nav.open { display: flex; }
  .nav a { display: block; }
  .hero-grid, .two-col, .contact-grid, .footer-inner { grid-template-columns: 1fr; }
  .feature-grid, .teacher-grid, .group-grid { grid-template-columns: 1fr; }
}

@media (max-width: 560px) {
  .hero-photo-panel { padding: 10px; }
  .hero-photo figcaption { left: 10px; bottom: 10px; }
  .topbar-inner { align-items: flex-start; flex-direction: column; padding: 8px 0; }
  .brand-name { font-size: 18px; }
  .brand-sub { display: none; }
  .hero { padding: 40px 0 32px; }
  .stat-grid { grid-template-columns: 1fr; }
  .news-list li { grid-template-columns: 1fr; }
  .section-title { display: block; }
  .teacher-card { grid-template-columns: 1fr; }
}
.card .button.primary, .page-hero + .section .button.primary { background: var(--ict-blue); color: #fff; }
.card .button.primary:hover, .page-hero + .section .button.primary:hover { background: var(--ict-red); color: #fff; }

.mail-icon-link {
  width: 34px;
  height: 34px;
  display: inline-grid;
  place-items: center;
  border-radius: 999px;
  color: inherit;
  border: 1px solid currentColor;
  line-height: 1;
  flex: 0 0 auto;
}
.mail-icon-link svg {
  width: 19px;
  height: 19px;
  display: block;
}
.topbar .mail-icon-link {
  color: rgba(255,255,255,.9);
  border-color: rgba(255,255,255,.38);
}
.topbar .mail-icon-link:hover {
  color: #fff;
  background: rgba(255,255,255,.12);
}
.footer .mail-icon-link {
  color: rgba(255,255,255,.9);
  border-color: rgba(255,255,255,.35);
}
.footer .mail-icon-link:hover {
  color: #fff;
  background: rgba(255,255,255,.10);
}
.contact-icon.mail-icon-link {
  color: var(--ict-blue);
  border-color: #c7def1;
}
.contact-icon.mail-icon-link:hover {
  color: #fff;
  background: var(--ict-blue);
}
.mail-action {
  margin-top: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.mail-icon-large {
  width: 52px;
  height: 52px;
  color: var(--ict-blue);
  border-color: #c7def1;
  background: var(--ict-blue-3);
}
.mail-icon-large svg {
  width: 27px;
  height: 27px;
}
.mail-icon-large:hover {
  color: #fff;
  background: var(--ict-blue);
}
.mail-hint {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}