:root {
  color-scheme: light;
  --blue: #0879d0;
  --deep-blue: #066fbc;
  --light-blue: #22b4ef;
  --ink: #11161c;
  --muted: #8b9098;
  --panel: #f3f4f6;
  --section-gray: #f5f7f9;
  --page-bg: #f3f5f7;
  --surface-border: #e6eaee;
  --divider: #cbd3dc;
  --page-gutter: clamp(40px, 5.2vw, 100px);
  --content-max: 1720px;
  --section-gap: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background: #dce2e8;
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

img {
  display: block;
  max-width: 100%;
}

.visual-scroll {
  display: contents;
}

.visual-scroll-hint,
.contact-scroll-hint {
  display: none;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: #fff;
  background: #071f4d;
  border-radius: 6px;
  transform: translateY(-160%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.site-shell {
  width: 100%;
  max-width: none;
  margin: 0;
  overflow: hidden;
  background: #fff;
  box-shadow: none;
}

@media (min-width: 801px) {
  body {
    padding: 10px;
    background: #f3f5f7;
  }

  .site-shell {
    width: calc(100% - 2px);
    margin: 0 auto;
    border: 1px solid #d9dee5;
    border-radius: 0;
    box-shadow: 0 2px 10px rgb(20 38 58 / 8%);
  }
}

.hero {
  position: relative;
  height: auto;
  min-height: 0;
  padding: 24px var(--page-gutter) 0;
  background: var(--page-bg);
}

.hero,
.hero img {
  width: 100%;
}

.hero img {
  width: 100%;
  max-width: var(--content-max);
  height: auto;
  margin: 0 auto;
  border: 1px solid var(--surface-border);
  border-radius: 0;
  box-shadow: none;
}

.hero-tagline {
  position: absolute;
  top: 43.5%;
  left: 25%;
  display: grid;
  width: 50%;
  height: auto;
  padding: 4px 0;
  margin: 0;
  color: #fff;
  background: none;
  place-items: center;
  font-size: clamp(8px, 1.8vw, 26px);
  font-weight: 700;
  line-height: 1;
  text-shadow: 0 2px 8px rgb(0 18 54 / 65%);
  white-space: nowrap;
}

.section {
  padding-right: var(--page-gutter);
  padding-left: var(--page-gutter);
  background: var(--page-bg);
}

.section-heading,
.section-content {
  width: 100%;
  max-width: var(--content-max);
  margin-right: auto;
  margin-left: auto;
  border: 1px solid var(--surface-border);
  background: #fff;
  box-shadow: none;
}

.section-heading {
  padding: clamp(36px, 2.6vw, 50px) clamp(40px, 4vw, 76px);
  border-top: 0;
  border-bottom-color: var(--divider);
  border-radius: 0;
}

.section-content {
  margin-top: 0;
  overflow: hidden;
  border-top: 0;
  border-radius: 0;
}

.section-heading h2,
.section-heading p,
.product-copy h3,
.product-copy p,
.timeline-card h3,
.timeline-card p {
  margin: 0;
}

.section-heading h2 {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.section-heading p {
  margin-top: 8px;
  font-size: 29px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.035em;
}

/* 四个内容章节共用同一套标题、渐变与科技弧线语言 */
.section-system {
  --section-arc-width: min(58%, 960px);
  --section-arc-height: 390px;
  --section-arc-transform: none;
  --section-glow-x: 84%;
  position: relative;
  min-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.section-system .section-header,
.section-system .section-content {
  border: 0;
  box-shadow: none;
}

.section-system .section-header {
  position: relative;
  z-index: 2;
  padding: 34px clamp(40px, 4vw, 76px) 30px;
  overflow: visible;
  background:
    radial-gradient(circle at var(--section-glow-x) 52%, rgb(8 121 208 / 7%) 0, rgb(8 121 208 / 2%) 24%, transparent 46%),
    linear-gradient(180deg, #fff 0%, #fff 70%, #f8fbff 100%);
}

.section-system .section-header::before {
  position: absolute;
  top: 50%;
  left: clamp(22px, 3vw, 58px);
  width: 4px;
  height: 76px;
  content: "";
  border-radius: 2px;
  background: var(--blue);
  transform: translateY(-50%);
}

.section-system .section-header::after {
  position: absolute;
  z-index: 0;
  top: 0;
  right: 0;
  width: var(--section-arc-width);
  height: var(--section-arc-height);
  content: "";
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 960 390'%3E%3Cg fill='none' stroke='%230879d0'%3E%3Cpath d='M82 38 C340 -8 528 66 708 178 C806 239 869 298 960 332' stroke-opacity='.105' stroke-width='2'/%3E%3Cpath d='M214 0 C438 38 606 116 750 229 C827 289 883 333 960 362' stroke-opacity='.075' stroke-width='1.4'/%3E%3Cpath d='M364 0 C534 72 655 145 774 255 C841 316 898 354 960 379' stroke-opacity='.055' stroke-width='3'/%3E%3C/g%3E%3Cg fill='%230879d0' fill-opacity='.10'%3E%3Ccircle cx='708' cy='178' r='4'/%3E%3Ccircle cx='750' cy='229' r='3'/%3E%3Ccircle cx='869' cy='298' r='3.5'/%3E%3C/g%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right top;
  background-size: 100% 100%;
  transform: var(--section-arc-transform);
  transform-origin: center;
}

.section-title-group {
  position: relative;
  z-index: 1;
}

.section-system .section-title-cn {
  color: #11161c;
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.04em;
}

.section-system .section-title-en {
  margin-top: 4px;
  color: #303943;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: 0.025em;
}

.section-system .section-content {
  position: relative;
  z-index: 1;
  overflow: hidden;
  background: linear-gradient(180deg, #f8fbff 0%, #f5f9fe 13%, #f3f8fe 24%, #fff 64%);
}

.section-system .section-content::before {
  position: absolute;
  z-index: 2;
  top: 0;
  right: 0;
  left: 0;
  height: 170px;
  content: "";
  pointer-events: none;
  background: linear-gradient(180deg, rgb(243 248 254 / 52%) 0%, rgb(248 251 255 / 15%) 52%, transparent 100%);
}

.core-technology {
  --section-arc-width: min(62%, 1000px);
  --section-arc-transform: scaleX(0.98) rotate(1deg);
  --section-glow-x: 79%;
}

.application-scenarios {
  --section-arc-width: min(68%, 1120px);
  --section-arc-height: 330px;
  --section-arc-transform: scaleY(0.72);
  --section-glow-x: 88%;
}

.milestone-section {
  --section-arc-width: min(61%, 990px);
  --section-arc-height: 360px;
  --section-arc-transform: scaleX(-1) rotate(-1deg);
  --section-glow-x: 75%;
}

.products .section-content,
.technology .section-content {
  padding: 0;
}

.products-visual {
  width: 100%;
  max-width: none;
  height: auto;
  margin: 0 auto;
}

.product-feature {
  display: grid;
  grid-template-columns: minmax(0, 580px) minmax(0, 580px);
  gap: 40px;
  align-items: stretch;
  margin-top: 55px;
}

.feature-photo {
  width: 100%;
  height: 433px;
  object-fit: cover;
  border-radius: 20px;
}

.product-copy {
  display: flex;
  min-width: 0;
  padding: 35px 38px 29px;
  flex-direction: column;
  justify-content: center;
  background: var(--panel);
  border-radius: 20px;
}

.product-copy h3 {
  margin-bottom: 22px;
  font-size: 22px;
  font-weight: 800;
  line-height: 1.35;
  text-align: center;
}

.product-copy p {
  font-size: 15px;
  line-height: 1.67;
  text-align: justify;
  text-indent: 2em;
}

.product-copy p + p {
  margin-top: 14px;
}

.product-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  margin-top: 42px;
}

.product-card {
  display: grid;
  aspect-ratio: 1.03 / 1;
  margin: 0;
  place-items: center;
  overflow: hidden;
  background: var(--panel);
  border-radius: 18px;
}

.product-card img {
  max-width: 78%;
  max-height: 78%;
  object-fit: contain;
  transition: transform 0.35s ease;
}

.product-card:nth-child(1) img {
  max-width: 71%;
  max-height: 78%;
}

.product-card:nth-child(2) img {
  max-width: 74%;
  max-height: 74%;
}

.product-card:nth-child(3) img {
  max-width: 68%;
  max-height: 80%;
}

.product-card:nth-child(4) img {
  max-width: 77%;
  max-height: 72%;
}

.product-card:hover img {
  transform: translateY(-5px) scale(1.025);
}

/* 核心技术 */
.technology {
  min-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.technology .section-heading {
  margin-left: auto;
}

.technology-map {
  width: 100%;
  max-width: none;
  margin: 0 auto;
}

/* 里程碑 */
.milestones {
  min-height: 0;
  padding-top: 0;
  padding-bottom: 0;
}

.milestones .section-content {
  padding: 20px clamp(24px, 2.2vw, 42px);
}

.timeline {
  position: relative;
  display: grid;
  height: 602px;
  margin: 0;
  padding: 0 50px;
  grid-template-columns: repeat(5, 1fr);
  list-style: none;
}

.timeline::before {
  position: absolute;
  top: 306px;
  right: 0;
  left: 0;
  height: 3px;
  content: "";
  background: #e5e8eb;
}

.timeline-item {
  position: relative;
  min-width: 0;
}

.timeline-dot {
  position: absolute;
  z-index: 2;
  top: 294px;
  left: 50%;
  width: 25px;
  height: 25px;
  border: 4px solid #fff;
  border-radius: 50%;
  background: #d9dcdf;
  box-shadow: 0 0 0 2px #d9dcdf;
  transform: translateX(-50%);
}

.timeline-item.is-complete .timeline-dot {
  background: var(--blue);
  box-shadow: 0 0 0 2px var(--blue);
}

.timeline-card {
  position: absolute;
  left: 50%;
  width: 285px;
  min-height: 154px;
  padding: 25px 27px;
  background: var(--panel);
  border-radius: 18px;
  transform: translateX(-50%);
}

.is-top .timeline-card {
  top: 58px;
}

.is-bottom .timeline-card {
  top: 373px;
}

.timeline-card::after {
  position: absolute;
  left: 50%;
  width: 0;
  height: 0;
  content: "";
  border-right: 18px solid transparent;
  border-left: 18px solid transparent;
  transform: translateX(-50%);
}

.is-top .timeline-card::after {
  bottom: -22px;
  border-top: 23px solid var(--panel);
}

.is-bottom .timeline-card::after {
  top: -22px;
  border-bottom: 23px solid var(--panel);
}

.timeline-card h3 {
  margin-bottom: 8px;
  font-size: 27px;
  line-height: 1.1;
}

.timeline-card p,
.timeline-card span,
.timeline-card strong {
  display: block;
  font-size: 18px;
  font-style: normal;
  line-height: 1.55;
}

.timeline-card span {
  color: #9a9ea4;
}

.timeline-card strong {
  color: var(--blue);
  font-weight: 500;
}

/* 业务场景 */
.business-scenes {
  padding-top: 0;
  padding-bottom: 0;
}

.business-scenes .section-heading {
  margin-left: auto;
}

.business-scenes .section-content {
  padding: 0;
}

.business-scenes-visual {
  margin: 0;
}

.business-scenes-visual img {
  width: 100%;
  height: auto;
}

/* 页脚 */
.site-footer {
  position: relative;
  width: calc(100% - clamp(80px, 10.4vw, 200px));
  max-width: var(--content-max);
  height: 505px;
  margin: 0 auto;
  border: 1px solid var(--surface-border);
  border-radius: 0;
  overflow: hidden;
  background:
    linear-gradient(135deg, transparent 42%, rgb(222 230 238 / 20%) 42%, transparent 72%),
    linear-gradient(30deg, #fff 0%, #f8fafc 72%, #fff 100%);
}

.site-footer::before,
.site-footer::after {
  position: absolute;
  content: "";
  opacity: 0.32;
}

.site-footer::before {
  top: 36px;
  right: -90px;
  width: 620px;
  height: 290px;
  background: linear-gradient(145deg, transparent 28%, #edf2f6 29%, #fafcfd 74%);
  clip-path: polygon(21% 0, 100% 0, 100% 100%, 0 59%);
}

.site-footer::after {
  bottom: 78px;
  left: -55px;
  width: 530px;
  height: 190px;
  background: #f2f6f9;
  clip-path: polygon(0 42%, 69% 0, 100% 100%, 0 100%);
}

.footer-wave-zone {
  position: absolute;
  z-index: 1;
  top: 0;
  right: 0;
  left: 0;
  height: 205px;
  border-bottom: 1px solid rgb(8 121 208 / 16%);
  background:
    radial-gradient(circle at 56% 20%, rgb(8 121 208 / 5%) 0, transparent 42%),
    linear-gradient(180deg, #fbfdff 0%, #f5f9fe 100%);
}

.signal-waves {
  position: absolute;
  z-index: 2;
  top: 23px;
  left: 0;
  width: 100%;
  height: 180px;
  overflow: visible;
  fill: none;
  stroke: #139ef0;
  stroke-width: 2.2;
}

.signal-waves .wave-soft {
  stroke: #2f72ff;
  stroke-width: 2;
}

.wave-points {
  fill: #0fb8d6;
  stroke: none;
}

.contact-panel {
  position: absolute;
  z-index: 3;
  top: 220px;
  left: 50%;
  width: min(1012px, calc(100% - 80px));
  height: 166px;
  transform: translateX(-50%);
}

.brand-qr {
  width: calc(100% - 13px);
  height: 166px;
  object-fit: contain;
  object-position: left center;
}

.contact-address-suffix {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: 3px;
  color: #111;
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1;
}

.footer-bar {
  position: absolute;
  z-index: 4;
  right: 0;
  bottom: 0;
  left: 0;
  display: grid;
  height: 82px;
  color: #fff;
  background: var(--deep-blue);
  align-content: center;
  gap: 6px;
  place-items: center;
  font-size: 18px;
}

.footer-slogan {
  letter-spacing: 0.32em;
}

.icp-record {
  font-size: 13px;
  letter-spacing: 0.06em;
}

@media (max-width: 1180px) {
  .product-feature {
    grid-template-columns: 1fr 1fr;
  }

  .product-copy {
    padding: 25px;
  }

  .product-copy h3 {
    margin-bottom: 14px;
    font-size: 19px;
  }

  .product-copy p {
    font-size: 13px;
  }

  .timeline-card {
    width: 225px;
    padding: 22px;
  }

  .timeline-card h3 {
    font-size: 23px;
  }

  .timeline-card p,
  .timeline-card span,
  .timeline-card strong {
    font-size: 15px;
  }
}

@media (max-width: 800px) {
  .hero {
    height: auto;
    min-height: 0;
    max-height: none;
    padding: 0 10px;
    background: var(--page-bg);
  }

  .hero img {
    position: static;
    width: 100%;
    height: auto;
    border-radius: 0;
  }

  .hero-tagline {
    top: 43.5%;
    left: 8%;
    width: 84%;
    height: auto;
    font-size: clamp(10px, 2.6vw, 16px);
  }

  .section-heading h2 {
    font-size: clamp(26px, 7vw, 34px);
  }

  .section-heading p {
    font-size: clamp(20px, 5vw, 27px);
  }

  .products,
  .technology,
  .milestones,
  .business-scenes {
    min-height: 0;
    padding: 0 10px;
  }

  .products {
    padding-top: 0;
  }

  .section-system .section-header {
    padding: 24px 22px 22px 44px;
  }

  .section-system .section-header::before {
    left: 24px;
    height: 58px;
  }

  .section-system {
    --section-arc-width: 76%;
    --section-arc-height: 280px;
    --section-arc-transform: none;
  }

  .section-system .section-header::after {
    opacity: 0.8;
  }

  .section-system .section-title-en {
    margin-top: 3px;
    font-size: 16px;
  }

  .section-system .section-title-cn {
    font-size: clamp(26px, 6.2vw, 30px);
  }

  .section-system .section-content::before {
    height: 120px;
  }

  .milestones {
    padding-bottom: 0;
  }

  .section-heading {
    padding: 28px 24px;
    border-radius: 0;
  }

  .section-content {
    margin-top: 0;
    border-radius: 0;
  }

  .products .section-content,
  .technology .section-content,
  .business-scenes .section-content {
    padding: 0;
  }

  .milestones .section-content {
    padding: 26px 18px;
  }

  .site-footer {
    width: calc(100% - 20px);
  }

  .technology .section-heading {
    margin-left: 0;
  }

  .business-scenes .section-heading {
    margin-left: 0;
  }

  .business-scenes-visual {
    width: auto;
    margin: 0;
  }

  .business-scenes-desktop {
    display: block;
    width: 100%;
    height: auto;
  }

  .visual-scroll {
    display: block;
    width: auto;
    margin: 0;
    padding: 0;
    overflow: visible;
  }

  .contact-panel::-webkit-scrollbar {
    display: none;
  }

  .visual-scroll::after {
    display: none;
  }

  .visual-scroll img {
    width: 100%;
    max-width: 100%;
    height: auto;
  }

  .visual-scroll-hint {
    display: none;
  }

  .product-feature {
    display: block;
    margin-top: 36px;
  }

  .products-visual {
    width: 100%;
    margin: 0;
  }

  .feature-photo {
    height: auto;
    border-radius: 14px;
  }

  .product-copy {
    margin-top: 20px;
    padding: 28px 24px;
    border-radius: 14px;
  }

  .product-copy h3 {
    font-size: 19px;
  }

  .product-copy p {
    font-size: 14px;
  }

  .product-gallery {
    gap: 14px;
    margin-top: 20px;
    grid-template-columns: repeat(2, 1fr);
  }

  .product-card {
    border-radius: 12px;
  }

  .technology-map {
    width: 100%;
    margin: 0;
  }

  .timeline {
    display: block;
    height: auto;
    margin-top: 0;
    padding: 0 0 0 34px;
  }

  .timeline::before {
    top: 0;
    bottom: 0;
    left: 10px;
    width: 3px;
    height: auto;
  }

  .timeline-item {
    padding-bottom: 24px;
  }

  .timeline-item:last-child {
    padding-bottom: 0;
  }

  .timeline-dot {
    top: 28px;
    left: -23px;
    width: 19px;
    height: 19px;
    border-width: 3px;
  }

  .timeline-card,
  .is-top .timeline-card,
  .is-bottom .timeline-card {
    position: relative;
    top: auto;
    left: auto;
    width: 100%;
    min-height: 0;
    padding: 22px 24px;
    transform: none;
  }

  .timeline-card::after,
  .is-top .timeline-card::after,
  .is-bottom .timeline-card::after {
    top: 28px;
    bottom: auto;
    left: -13px;
    border-top: 11px solid transparent;
    border-right: 14px solid var(--panel);
    border-bottom: 11px solid transparent;
    border-left: 0;
    transform: none;
  }

  .timeline-card h3 {
    font-size: 22px;
  }

  .site-footer {
    height: auto;
    min-height: 400px;
    padding: 160px 18px 110px;
  }

  .signal-waves {
    top: 12px;
    height: 140px;
  }

  .footer-wave-zone {
    height: 148px;
  }

  .contact-panel {
    position: relative;
    top: auto;
    left: auto;
    display: block;
    width: calc(100% + 36px);
    height: auto;
    margin-left: -18px;
    padding: 0;
    overflow: hidden;
    transform: none;
  }

  .brand-qr {
    width: calc(100% - 7px);
    max-width: 100%;
    height: auto;
  }

  .contact-address-suffix {
    top: 50%;
    right: 1px;
    font-size: clamp(6px, 1.6vw, 7px);
  }

  .contact-scroll-hint {
    display: none;
  }

  .footer-bar {
    min-height: 82px;
    height: auto;
    padding: 18px 22px;
    text-align: center;
    font-size: 14px;
    line-height: 1.8;
  }

  .footer-slogan {
    letter-spacing: 0.18em;
  }

  .icp-record {
    font-size: 12px;
  }
}

@media (max-width: 600px) {
  .hero {
    height: auto;
    min-height: 0;
    max-height: none;
  }

  .hero img {
    width: 100%;
    height: auto;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 0 8px;
  }

  .products,
  .technology,
  .milestones,
  .business-scenes {
    padding: 0 8px;
  }

  .products {
    padding-top: 0;
  }

  .section-system .section-header {
    padding: 22px 16px 20px 40px;
  }

  .section-system .section-header::before {
    left: 20px;
    height: 52px;
  }

  .section-system {
    --section-arc-width: 80%;
    --section-arc-height: 240px;
  }

  .section-system .section-title-cn {
    font-size: 26px;
  }

  .milestones {
    padding-bottom: 0;
  }

  .section-heading {
    padding: 22px 18px;
  }

  .site-footer {
    width: calc(100% - 16px);
  }

  .section-heading h2 {
    font-size: 24px;
  }

  .section-heading p {
    margin-top: 4px;
    font-size: 16px;
  }

  .business-scenes-visual {
    margin: 0;
  }

  .visual-scroll {
    margin: 0;
  }

  .products-visual {
    width: 100%;
    margin: 0;
  }

  .technology-map {
    width: 100%;
    margin: 0;
  }

  .timeline {
    margin-top: 38px;
    padding-left: 30px;
  }

  .timeline-dot {
    left: -19px;
  }

  .timeline-card,
  .is-top .timeline-card,
  .is-bottom .timeline-card {
    padding: 19px 20px;
  }

  .site-footer {
    min-height: 380px;
    padding-top: 150px;
  }

  .footer-wave-zone {
    height: 140px;
  }

  .brand-qr {
    width: calc(100% - 7px);
  }

  .footer-bar {
    padding: 16px 14px;
    font-size: 13px;
  }

  .footer-slogan {
    letter-spacing: 0.08em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .product-card img {
    transition: none;
  }
}