* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --white: #ffffff;
  --off: #f4f4f2;
  --black: #111111;
  --gray: #6b6b6b;
  --light: #e8e8e6;
  --accent: #d9ff3d;   /* 荧光黄绿，少量点缀 */
}
html { scroll-behavior: smooth; }
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
.container { max-width: 1400px; margin: 0 auto; padding: 0 40px; }

/* 导航 */
header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(255,255,255,.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--light);
}
.nav {
  display: flex; align-items: center; justify-content: space-between;
  height: 74px;
}
.logo {
  font-size: 18px; font-weight: 800; letter-spacing: -.5px;
}
.logo span { color: var(--gray); font-weight: 400; }
.nav-links { display: flex; gap: 2px; list-style: none; }
.nav-links a {
  display: block; padding: 8px 18px; font-size: 14px;
  color: var(--gray); transition: .2s; letter-spacing: .3px;
}
.nav-links a:hover, .nav-links a.active { color: var(--black); }
.nav-links a.active { font-weight: 700; }
.nav-cta {
  padding: 10px 22px; background: var(--black); color: var(--white);
  font-size: 13px; letter-spacing: .5px; transition: .25s;
}
.nav-cta:hover { background: var(--accent); color: var(--black); }
.menu-toggle {
  display: none; background: none; border: none;
  font-size: 24px; cursor: pointer; color: var(--black);
}

/* Hero */
.hero {
  padding: 180px 0 100px;
  border-bottom: 1px solid var(--light);
}
.hero-top {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 50px; flex-wrap: wrap; gap: 20px;
}
.hero-index {
  font-size: 13px; color: var(--gray); letter-spacing: 2px;
}
.hero-index strong { color: var(--black); font-weight: 700; }
.hero h1 {
  font-size: clamp(56px, 9vw, 132px);
  line-height: .95; font-weight: 800; letter-spacing: -4px;
  text-transform: uppercase;
}
.hero h1 .thin { font-weight: 300; color: var(--gray); }
.hero h1 .dot { color: var(--accent); }
.hero-sub {
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
  margin-top: 60px; padding-top: 40px; border-top: 1px solid var(--light);
}
.hero-sub p { color: var(--gray); font-size: 16px; max-width: 480px; line-height: 1.8; }
.hero-actions { display: flex; gap: 14px; align-items: flex-start; justify-content: flex-end; }
.btn-solid {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 30px; background: var(--black); color: var(--white);
  font-size: 14px; letter-spacing: .5px; transition: .25s;
}
.btn-solid:hover { background: var(--accent); color: var(--black); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 15px 30px; border: 1px solid var(--black); font-size: 14px;
  transition: .25s;
}
.btn-outline:hover { background: var(--black); color: var(--white); }

/* 跑马灯 */
.marquee {
  border-bottom: 1px solid var(--light);
  overflow: hidden; padding: 22px 0;
  background: var(--off);
}
.marquee-track {
  display: flex; gap: 60px; white-space: nowrap;
  animation: scroll 28s linear infinite;
  font-size: 15px; color: var(--gray); letter-spacing: 1px;
}
.marquee-track span { display: inline-flex; align-items: center; gap: 60px; }
.marquee-track span::after { content: '✦'; color: var(--accent); font-size: 12px; }
@keyframes scroll { from { transform: translateX(0); } to { transform: translateX(-50%); } }

/* 通用区块 */
.section { padding: 120px 0; }
.section-off { background: var(--off); }
.section-head {
  display: flex; justify-content: space-between; align-items: flex-end;
  margin-bottom: 70px; padding-bottom: 24px;
  border-bottom: 1px solid var(--light); flex-wrap: wrap; gap: 20px;
}
.section-head .label {
  font-size: 13px; color: var(--gray); letter-spacing: 2px; text-transform: uppercase;
}
.section-head h2 {
  font-size: clamp(32px, 4.5vw, 56px); font-weight: 800;
  letter-spacing: -2px; line-height: 1.05;
}
.section-head h2 em { font-style: normal; font-weight: 300; color: var(--gray); }
.section-head .desc { color: var(--gray); font-size: 15px; max-width: 380px; }

/* 数据 */
.stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--black); border-bottom: 1px solid var(--light);
}
.stat {
  padding: 40px 30px; border-right: 1px solid var(--light);
  transition: .25s;
}
.stat:last-child { border-right: none; }
.stat:hover { background: var(--off); }
.stat .num {
  font-size: clamp(40px, 5vw, 64px); font-weight: 800; letter-spacing: -3px;
  line-height: 1;
}
.stat .num sup { font-size: .4em; vertical-align: super; color: var(--accent); }
.stat .label { font-size: 13px; color: var(--gray); margin-top: 10px; letter-spacing: .5px; }

/* 项目网格 */
.works-grid {
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 2px;
  background: var(--light);
}
.work {
  position: relative; overflow: hidden; background: var(--white);
  aspect-ratio: 4/3; cursor: pointer;
}
.work img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .6s cubic-bezier(.2,.8,.2,1);
  filter: grayscale(1);
}
.work:hover img { transform: scale(1.05); filter: grayscale(0); }
.work-meta {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 30px; display: flex; justify-content: space-between; align-items: flex-end;
  background: linear-gradient(transparent, rgba(0,0,0,.7));
  color: var(--white);
  transform: translateY(10px); opacity: .0; transition: .35s;
}
.work:hover .work-meta { transform: translateY(0); opacity: 1; }
.work-meta .idx { font-size: 12px; letter-spacing: 2px; opacity: .8; }
.work-meta h3 { font-size: 22px; font-weight: 700; letter-spacing: -.5px; }
.work-meta .cat { font-size: 13px; opacity: .8; }

/* 新闻列表 */
.news-list { border-top: 1px solid var(--black); }
.news-row {
  display: grid; grid-template-columns: 120px 1fr 160px;
  gap: 40px; align-items: center;
  padding: 34px 0; border-bottom: 1px solid var(--light);
  transition: .25s;
}
.news-row:hover { padding-left: 16px; background: var(--off); }
.news-row .date {
  font-size: 13px; color: var(--gray); letter-spacing: 1px;
}
.news-row h3 {
  font-size: clamp(18px, 2vw, 24px); font-weight: 700;
  letter-spacing: -.3px; line-height: 1.4;
}
.news-row .tag {
  font-size: 13px; color: var(--gray); text-align: right;
}
.news-row .tag::after { content: '↗'; margin-left: 8px; color: var(--accent); font-weight: 700; }

/* 页面 banner */
.page-banner {
  padding: 170px 0 70px; border-bottom: 1px solid var(--light);
}
.page-banner .label {
  font-size: 13px; color: var(--gray); letter-spacing: 2px;
  text-transform: uppercase; margin-bottom: 24px;
}
.page-banner h1 {
  font-size: clamp(48px, 7vw, 96px); font-weight: 800;
  letter-spacing: -3px; line-height: .95; text-transform: uppercase;
}
.page-banner h1 em { font-style: normal; font-weight: 300; color: var(--gray); }
.page-banner p { color: var(--gray); font-size: 16px; margin-top: 24px; max-width: 560px; }

/* 简介页 */
.about-lead {
  font-size: clamp(24px, 3vw, 36px); line-height: 1.5;
  font-weight: 300; letter-spacing: -1px; max-width: 1000px;
  margin-bottom: 70px;
}
.about-lead strong { font-weight: 800; }
.about-cols {
  display: grid; grid-template-columns: 1fr 1fr; gap: 80px;
}
.about-cols h3 {
  font-size: 14px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--gray); margin-bottom: 24px; padding-bottom: 12px;
  border-bottom: 1px solid var(--light);
}
.about-cols p { color: var(--gray); font-size: 16px; line-height: 1.9; margin-bottom: 18px; }
.timeline { border-top: 1px solid var(--black); margin-top: 30px; }
.timeline .item {
  display: grid; grid-template-columns: 140px 1fr; gap: 30px;
  padding: 26px 0; border-bottom: 1px solid var(--light);
}
.timeline .year { font-size: 18px; font-weight: 800; letter-spacing: -1px; }
.timeline .desc { color: var(--gray); font-size: 15px; }
.honor-list { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.honor-list span {
  padding: 8px 18px; border: 1px solid var(--light);
  font-size: 14px; color: var(--gray); transition: .2s;
}
.honor-list span:hover { border-color: var(--black); color: var(--black); }

/* 联系页 */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; }
.contact-block h3 {
  font-size: 14px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--gray); margin-bottom: 20px; padding-bottom: 12px;
  border-bottom: 1px solid var(--light);
}
.contact-item { padding: 18px 0; border-bottom: 1px solid var(--light); }
.contact-item .k { font-size: 12px; color: var(--gray); letter-spacing: 1px; margin-bottom: 4px; }
.contact-item .v { font-size: 18px; font-weight: 700; letter-spacing: -.3px; }
.contact-form .field { margin-bottom: 24px; }
.contact-form label {
  display: block; font-size: 12px; color: var(--gray);
  letter-spacing: 1px; text-transform: uppercase; margin-bottom: 8px;
}
.contact-form input, .contact-form textarea {
  width: 100%; padding: 12px 0; border: none;
  border-bottom: 1px solid var(--light); background: transparent;
  font-family: inherit; font-size: 16px; color: var(--black);
}
.contact-form input:focus, .contact-form textarea:focus {
  outline: none; border-bottom-color: var(--black);
}
.contact-form textarea { height: 90px; resize: vertical; }
.contact-form button {
  margin-top: 16px; padding: 16px 40px;
  background: var(--black); color: var(--white);
  border: none; cursor: pointer; font-size: 14px;
  letter-spacing: 1px; transition: .25s; font-family: inherit;
}
.contact-form button:hover { background: var(--accent); color: var(--black); }

/* 页脚 */
footer {
  border-top: 1px solid var(--black); padding: 60px 0 30px;
  margin-top: 100px;
}
.footer-top {
  display: flex; justify-content: space-between; align-items: flex-start;
  padding-bottom: 50px; border-bottom: 1px solid var(--light);
  flex-wrap: wrap; gap: 40px;
}
.footer-brand h4 {
  font-size: 28px; font-weight: 800; letter-spacing: -1px; margin-bottom: 14px;
}
.footer-brand p { color: var(--gray); font-size: 15px; max-width: 340px; }
.footer-cols { display: flex; gap: 70px; flex-wrap: wrap; }
.footer-cols h5 {
  font-size: 12px; letter-spacing: 2px; text-transform: uppercase;
  color: var(--gray); margin-bottom: 16px;
}
.footer-cols ul { list-style: none; }
.footer-cols li { font-size: 14px; margin-bottom: 8px; }
.footer-cols a:hover { color: var(--accent); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 26px; flex-wrap: wrap; gap: 16px;
  font-size: 13px; color: var(--gray);
}
.footer-bottom .top-btn {
  font-size: 13px; letter-spacing: 1px; cursor: pointer;
  transition: .2s;
}
.footer-bottom .top-btn:hover { color: var(--black); }

/* 响应式 */
@media (max-width: 992px) {
  .container { padding: 0 24px; }
  .hero { padding: 140px 0 70px; }
  .hero-sub { grid-template-columns: 1fr; gap: 30px; }
  .hero-actions { justify-content: flex-start; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
  .stat:nth-child(n+3) { border-top: 1px solid var(--light); }
  .works-grid { grid-template-columns: 1fr; }
  .about-cols { grid-template-columns: 1fr; gap: 40px; }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-cols { gap: 40px; }
}
@media (max-width: 768px) {
  .nav-links {
    position: absolute; top: 74px; left: 0; right: 0;
    background: var(--white); flex-direction: column;
    padding: 20px 24px; border-bottom: 1px solid var(--light);
    display: none;
  }
  .nav-links.open { display: flex; }
  .menu-toggle { display: block; }
  .nav-cta { display: none; }
  .hero h1 { letter-spacing: -2px; }
  .section { padding: 70px 0; }
  .section-head { margin-bottom: 40px; }
  .news-row { grid-template-columns: 1fr; gap: 10px; }
  .news-row .tag { text-align: left; }
  .timeline .item { grid-template-columns: 1fr; gap: 6px; }
  .footer-top { flex-direction: column; }
  .footer-cols { gap: 30px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
}