:root {
  --ink: #132033;
  --muted: #5a6575;
  --line: #dce3ec;
  --paper: #f7f9fc;
  --white: #ffffff;
  --blue: #1664d9;
  --cyan: #1aa4b8;
  --green: #16835f;
  --gold: #c88418;
  --shadow: 0 16px 42px rgba(18, 32, 51, .16);
  --radius: 8px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  font-family: "Microsoft YaHei", "PingFang SC", "Segoe UI", Arial, sans-serif;
  background: var(--paper);
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; }
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px clamp(18px, 4vw, 56px);
  background: rgba(255, 255, 255, .92);
  border-bottom: 1px solid rgba(220, 227, 236, .8);
  backdrop-filter: blur(14px);
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  font-weight: 800;
}
.brand-mark {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  flex: 0 0 auto;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: 8px;
  font-size: 18px;
}
.brand-text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  color: #2d3a4c;
  font-size: 14px;
  white-space: nowrap;
}
.nav-links a { opacity: .92; }
.nav-join {
  padding: 8px 14px;
  color: var(--white);
  background: var(--blue);
  border-radius: 6px;
  font-weight: 700;
}
.hero {
  position: relative;
  min-height: 92vh;
  padding-top: 66px;
  color: var(--white);
  overflow: hidden;
  background: #101928;
}
.slider { position: absolute; inset: 0; }
.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity .55s ease;
}
.slide.is-active { opacity: 1; }
.slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.06);
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(8, 14, 25, .86), rgba(8, 14, 25, .46) 48%, rgba(8, 14, 25, .22)),
    linear-gradient(0deg, rgba(8, 14, 25, .66), rgba(8, 14, 25, 0) 38%);
  pointer-events: none;
}
.hero-content {
  position: relative;
  z-index: 2;
  display: grid;
  align-content: center;
  width: min(1180px, calc(100% - 36px));
  min-height: calc(92vh - 66px);
  margin: 0 auto;
  padding: 56px 0 120px;
}
.eyebrow {
  width: fit-content;
  margin: 0 0 18px;
  padding: 7px 12px;
  color: #d8f5ff;
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .24);
  border-radius: 6px;
  font-size: 14px;
  font-weight: 700;
}
h1 {
  max-width: 850px;
  margin: 0;
  font-size: clamp(40px, 7vw, 82px);
  line-height: 1.08;
  letter-spacing: 0;
}
.hero-subtitle {
  max-width: 720px;
  margin: 22px 0 0;
  color: rgba(255, 255, 255, .86);
  font-size: clamp(17px, 2vw, 22px);
}
.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 34px;
}
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 18px;
  border: 1px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 800;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn:hover { transform: translateY(-1px); }
.btn-primary {
  color: var(--white);
  background: var(--blue);
  box-shadow: 0 12px 28px rgba(22, 100, 217, .36);
}
.btn-light {
  color: var(--white);
  background: rgba(255, 255, 255, .14);
  border-color: rgba(255, 255, 255, .34);
}
.slider-controls {
  position: absolute;
  z-index: 3;
  right: clamp(18px, 4vw, 56px);
  bottom: 36px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.arrow {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  color: var(--white);
  background: rgba(255, 255, 255, .14);
  border: 1px solid rgba(255, 255, 255, .32);
  border-radius: 50%;
  cursor: pointer;
  backdrop-filter: blur(10px);
}
.dots { display: flex; gap: 7px; margin-left: 8px; }
.dot {
  width: 10px;
  height: 10px;
  padding: 0;
  background: rgba(255, 255, 255, .45);
  border: 0;
  border-radius: 50%;
  cursor: pointer;
}
.dot.is-active {
  width: 26px;
  background: var(--white);
  border-radius: 999px;
}
.section { padding: 72px clamp(18px, 4vw, 56px); }
.section-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}
.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 28px;
}
.section-kicker {
  margin: 0 0 6px;
  color: var(--blue);
  font-weight: 800;
}
h2 {
  margin: 0;
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.18;
  letter-spacing: 0;
}
.section-copy {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  font-size: 16px;
}
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.stat {
  padding: 22px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(19, 32, 51, .07);
  text-align: left;
}
.stat strong {
  display: block;
  color: var(--ink);
  font-size: 30px;
  line-height: 1;
}
.stat span {
  display: block;
  margin-top: 9px;
  color: var(--muted);
  font-size: 14px;
}
.intro-band {
  background: var(--white);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 26px;
}
.about-copy {
  padding: 30px;
  background: #eef5ff;
  border: 1px solid #d4e5fb;
  border-radius: var(--radius);
}
.about-copy p {
  margin: 0;
  color: #2c405a;
  font-size: 18px;
}
.principles {
  display: grid;
  gap: 12px;
}
.principle {
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 5px solid var(--cyan);
  border-radius: var(--radius);
}
.principle:nth-child(2) { border-left-color: var(--green); }
.principle:nth-child(3) { border-left-color: var(--gold); }
.principle h3 { margin: 0 0 6px; font-size: 20px; }
.principle p { margin: 0; color: var(--muted); }
.tracks {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.track {
  min-height: 230px;
  padding: 24px;
  color: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  background: #1a3359;
  box-shadow: var(--shadow);
}
.track::after {
  content: "";
  position: absolute;
  right: -48px;
  bottom: -52px;
  width: 160px;
  height: 160px;
  border: 1px solid rgba(255, 255, 255, .2);
  border-radius: 50%;
}
.track:nth-child(2) { background: #0f604e; }
.track:nth-child(3) { background: #6e4b1f; }
.track:nth-child(4) { background: #673646; }
.track-icon {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  margin-bottom: 22px;
  background: rgba(255, 255, 255, .16);
  border-radius: 8px;
  font-size: 24px;
}
.track h3 { margin: 0 0 10px; font-size: 24px; }
.track p { margin: 0; color: rgba(255, 255, 255, .78); }
.gallery-band {
  background: #111b2b;
  color: var(--white);
}
.gallery-band .section-kicker { color: #7dd8ff; }
.gallery-band .section-copy { color: rgba(255, 255, 255, .68); }
.gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.photo {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 0;
  border-radius: var(--radius);
  background: #1d2c44;
  cursor: pointer;
  padding: 0;
}
.photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .28s ease;
}
.photo:hover img { transform: scale(1.05); }
.photo span {
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 12px;
  padding: 8px 10px;
  color: var(--white);
  background: rgba(0, 0, 0, .48);
  border-radius: 6px;
  font-weight: 700;
  font-size: 14px;
}
.join { background: var(--white); }
.join-panel {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 22px;
  align-items: center;
  padding: 34px;
  background: linear-gradient(135deg, #eef5ff, #ffffff 48%, #effaf6);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 14px 38px rgba(19, 32, 51, .08);
}
.join-panel p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 17px;
}
.qq-box {
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-align: center;
}
.qq-box span { display: block; color: var(--muted); font-size: 14px; }
.qq-number {
  margin: 8px 0 16px;
  color: var(--blue);
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 900;
  line-height: 1;
}
.notice {
  margin-top: 16px;
  padding: 16px 18px;
  color: #2f3d4f;
  background: #f3f7fb;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 15px;
}
.notice strong {
  color: var(--ink);
}
.footer {
  padding: 26px clamp(18px, 4vw, 56px);
  color: #7c8798;
  background: #101928;
  font-size: 14px;
  text-align: center;
}
.page { padding-top: 88px; }
.page-hero { padding: 64px clamp(18px, 4vw, 56px) 30px; }
.page-hero-inner {
  width: min(1180px, 100%);
  margin: 0 auto;
}
.page-hero-card {
  padding: 36px;
  color: var(--white);
  background: linear-gradient(135deg, #12315f, #17667d 70%, #144b57);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.page-hero-card p {
  max-width: 760px;
  margin: 14px 0 0;
  color: rgba(255, 255, 255, .84);
  font-size: 18px;
}
.content-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.professor-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 24px;
  align-items: start;
}
.professor-photo-panel {
  padding: 18px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(19, 32, 51, .06);
}
.professor-photo-panel img {
  display: block;
  width: 100%;
  border-radius: var(--radius);
}
.professor-photo-panel strong {
  display: block;
  margin-top: 14px;
  font-size: 22px;
}
.professor-photo-panel span {
  display: block;
  color: var(--muted);
}
.profile-section {
  margin-bottom: 16px;
}
.profile-section:last-child {
  margin-bottom: 0;
}
.profile-section p {
  margin: 0;
  color: var(--muted);
}
.paper-list {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}
.paper-list li {
  margin-bottom: 8px;
}
.card {
  display: block;
  padding: 24px;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 8px 28px rgba(19, 32, 51, .06);
}
.card h3 { margin: 0 0 8px; font-size: 22px; }
.card p { margin: 0; color: var(--muted); }
.page-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.award-category {
  margin-bottom: 42px;
}
.award-category:last-child {
  margin-bottom: 0;
}
.category-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}
.category-head h2 {
  font-size: clamp(24px, 3vw, 34px);
}
.category-count {
  color: var(--muted);
  font-size: 14px;
  white-space: nowrap;
}
.placeholder-gallery {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
}
.blank-photo,
.coach-card {
  display: grid;
  place-items: center;
  min-height: 190px;
  padding: 20px;
  color: #718096;
  background:
    linear-gradient(135deg, #f8fafc, #eef3f8);
  border: 1px dashed #b9c5d3;
  border-radius: var(--radius);
  cursor: pointer;
  text-align: center;
}
.blank-photo strong,
.coach-card strong {
  display: block;
  color: var(--ink);
  font-size: 18px;
}
.blank-photo span,
.coach-card span {
  display: block;
  margin-top: 8px;
  font-size: 14px;
}
.coach-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}
.coach-card {
  min-height: 220px;
  background: var(--white);
  border-style: solid;
  box-shadow: 0 8px 28px rgba(19, 32, 51, .06);
}
.profile-photo {
  width: 96px;
  height: 96px;
  margin-bottom: 14px;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid #eef4fb;
}
.coach-avatar {
  display: grid;
  width: 72px;
  height: 72px;
  place-items: center;
  margin-bottom: 14px;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-radius: 50%;
  font-weight: 900;
  font-size: 24px;
}
.coach-modal-body {
  padding: 26px;
  color: var(--muted);
  background: var(--white);
  max-height: calc(88vh - 62px);
  overflow: auto;
  white-space: pre-line;
}
.coach-modal-body h3 {
  margin: 0 0 10px;
  color: var(--ink);
  font-size: 28px;
}
.modal-profile-photo {
  width: 138px;
  height: 138px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--line);
  float: right;
  margin: 0 0 18px 22px;
}
.coach-modal-body p {
  margin: 0;
}
.slide-gallery {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.slide-gallery .photo {
  aspect-ratio: 16 / 9;
}
.modal {
  position: fixed;
  inset: 0;
  z-index: 40;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 18px;
  background: rgba(8, 14, 25, .78);
}
.modal.is-open { display: flex; }
.modal-content {
  width: min(980px, 100%);
  max-height: min(760px, 88vh);
  overflow: hidden;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.modal-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border-bottom: 1px solid var(--line);
}
.modal-top strong { color: var(--ink); }
.close {
  width: 36px;
  height: 36px;
  color: var(--ink);
  background: #eef2f7;
  border: 0;
  border-radius: 50%;
  cursor: pointer;
  font-size: 22px;
  line-height: 1;
}
.modal-content img {
  display: block;
  width: 100%;
  max-height: calc(88vh - 62px);
  object-fit: contain;
  background: #101928;
}
@media (max-width: 920px) {
  .nav-links a:not(.nav-join):not(:first-child) { display: none; }
  .stats, .tracks, .gallery, .page-gallery, .placeholder-gallery, .coach-grid, .content-grid, .about-grid, .join-panel, .professor-layout { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  .nav { padding: 10px 14px; }
  .brand-mark { width: 34px; height: 34px; }
  .brand-text { max-width: 178px; font-size: 14px; }
  .hero { min-height: 88vh; padding-top: 55px; }
  .hero-content { min-height: calc(88vh - 55px); width: min(100% - 28px, 1180px); padding: 44px 0 106px; }
  .hero-subtitle { font-size: 17px; }
  .hero-actions, .section-head { align-items: stretch; flex-direction: column; }
  .btn { width: 100%; }
  .slider-controls { left: 14px; right: 14px; bottom: 24px; justify-content: space-between; }
  .dots { margin-left: 0; }
  .section, .page-hero { padding-left: 14px; padding-right: 14px; }
  .section { padding-top: 52px; padding-bottom: 52px; }
  .stats, .tracks, .gallery, .page-gallery, .placeholder-gallery, .coach-grid, .content-grid, .professor-layout { grid-template-columns: 1fr; }
  .about-copy, .join-panel, .page-hero-card, .card { padding: 22px; }
  .gallery { gap: 12px; }
}