:root {
  --brand: #165dff;
  --brand-2: #4e8bff;
  --ink: #101828;
  --muted: #4a5565;
  --soft: #f9fafb;
  --line: #f0f2f5;
  --footer: #101828;
  --radius: 14px;
  --shadow: 0 18px 45px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  min-height: 100%;
}

body {


  margin: 0;
  /* 顶部padding = 头部高度 80px */
  padding-top: 80px;
  color: var(--ink);
  background: #fff;
  font-family: Inter, "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
  letter-spacing: 0;
  min-height: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

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

.container {
  width: min(100% - 64px, 1280px);
  margin-inline: auto;
}

.site-header {
  position: fixed; /* 全局固定，替代sticky */
  top: 0;
  left: 0;
  width: 100%;
  height: 80px;
  z-index: 999;
  background: rgba(255, 255, 255, 0.96);
  border-bottom: 1px solid #eef1f6;
  backdrop-filter: blur(14px); /* 毛玻璃可以保留，fixed不受滤镜影响 */
  overflow: visible !important;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 150px;
  font-weight: 700;
  color: #1d2939;
}

.brand img.brand-mark {
  display: block;
  height: 42px;
  width: auto;
  max-width: 123px;
  object-fit: contain;
  flex-shrink: 0;
}

.footer-logo img {
  display: block;
  height: 42px;
  width: auto;
  max-width: 42px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand span {
  white-space: nowrap;
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  flex: 1;
}

.site-nav a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 16px;
  border-radius: 8px;
  color: #344054;
  font-size: 16px;
  line-height: 1.5;
  transition: color 0.2s ease, background 0.2s ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--brand);
  background: rgba(22, 93, 255, 0.07);
}

.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 24px;
  border: 0;
  border-radius: 14px;
  font-size: 16px;
  font-weight: 500;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.nav-cta {
  min-height: 40px;
  color: #fff;
  background: var(--brand);
  font-size: 14px;
}

.nav-cta:hover,
.button:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 28px rgba(22, 93, 255, 0.18);
}

.button.primary {
  color: #fff;
  background: var(--brand);
}

.light-button {
  color: var(--brand);
  background: #fff;
}

.button.ghost {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.18);
}

.button.translucent {
  color: #fff;
  background: rgba(255, 255, 255, 0.16);
}

.button.has-icon {
  gap: 8px;
}

.button .btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.button.translucent .btn-icon,
.button.ghost .btn-icon {
  filter: brightness(0) invert(1);
}

.menu-button {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 8px;
  background: rgba(22, 93, 255, 0.08);
}

.menu-button span {
  display: block;
  width: 20px;
  height: 2px;
  margin: 5px auto;
  background: var(--brand);
  border-radius: 10px;
}

.hero {
  position: relative;
  min-height: clamp(560px, calc(100svh - 128px), 872px);
  overflow: hidden;
  color: #fff;
  background: linear-gradient(135deg, #1961ff 0%, #4b88ff 100%);
}

.hero-bg {
  position: absolute;
  inset: 0;
  opacity: 0.2;
  background:
    radial-gradient(circle at 22% 18%, rgba(255, 255, 255, 0.12), transparent 32%),
    radial-gradient(circle at 78% 24%, rgba(255, 255, 255, 0.1), transparent 34%);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -42% -10%;
  height: 520px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.16), transparent 64%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: flex;
  min-height: clamp(560px, calc(100svh - 128px), 872px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(48px, 10svh, 120px) 0 clamp(72px, 12svh, 156px);
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  margin: 0 0 16px;
  padding: 6px 16px;
  border-radius: 999px;
  color: var(--brand);
  background: rgba(22, 93, 255, 0.08);
  font-size: 14px;
  line-height: 20px;
}

.eyebrow.light {
  color: #fff;
  background: rgba(255, 255, 255, 0.14);
}

.hero h1 {
  max-width: 800px;
  margin: 0;
  font-size: 60px;
  font-weight: 700;
  line-height: 1.25;
}

.hero-copy {
  max-width: 768px;
  margin: 28px 0 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 20px;
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 110px 0 96px;
  color: #fff;
  background: linear-gradient(135deg, #1961ff 0%, #4b88ff 100%);
  text-align: center;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: auto -10% -45% -10%;
  height: 360px;
  background: radial-gradient(circle at center, rgba(255, 255, 255, 0.16), transparent 64%);
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  margin: 0;
  font-size: 52px;
  line-height: 1.2;
}

.page-hero p {
  max-width: 760px;
  margin: 20px auto 0;
  color: rgba(255, 255, 255, 0.9);
  font-size: 20px;
  line-height: 1.7;
}



.page-hero.about-hero {
  min-height: 336px;
  display: flex;
  align-items: center;
  text-align: left;
  padding: 0;
  /* 关键补偿：顶部留出导航栏高度，抵消fixed头部遮挡，实现视觉居中 */
  padding-top: 80px;
  box-sizing: border-box;
}

/* 给Hero内部容器增加左右内边距，解决文字贴左 */
.page-hero.about-hero .container {
  padding-inline: 40px; /* 左右统一留白，大屏不贴边 */
  width: 100%;
}



.page-hero.about-hero p {
  margin-left: 0;
  margin-right: 0;
  max-width: 800px;
}

.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 14px;
}

.breadcrumb a {
  color: #fff;
}

.split-section {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 64px;
}

.split-section img {
  width: 100%;
  border-radius: var(--radius);
  object-fit: cover;
}

.image-shell {
  padding: 48px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(22, 93, 255, 0.1), rgba(78, 139, 255, 0.1));
}

.image-shell img {
  width: 100%;
  aspect-ratio: 585 / 420;
  border-radius: 14px;
  object-fit: cover;
}

.content-copy h2,
.content-copy h3 {
  margin: 0;
  color: var(--ink);
  line-height: 1.25;
}

.content-copy h2 {
  font-size: 36px;
}

.content-copy h3 {
  font-size: 28px;
}

.content-copy p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.8;
}

.check-list,
.plain-list {
  display: grid;
  gap: 14px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.check-list li,
.plain-list li {
  position: relative;
  padding-left: 28px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.check-list li::before,
.plain-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--brand);
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}

.feature-card,
.detail-card,
.contact-card {
  padding: 32px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
}

.feature-card h3,
.detail-card h3,
.contact-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 22px;
  line-height: 1.35;
}

.feature-card p,
.detail-card p,
.contact-card p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.7;
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.detail-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-bottom: 22px;
  border-radius: 8px;
  object-fit: cover;
}

.card-action {
  margin-top: 22px;
}

.detail-card .button {
  min-height: 42px;
  padding: 0 18px;
  border-radius: 8px;
  font-size: 14px;
}

.case-list {
  display: grid;
  gap: 24px;
}

.case-list .case-card {
  display: grid;
  grid-template-columns: 140px 1fr minmax(180px, auto) auto;
  align-items: center;
  gap: 28px;
  min-height: auto;
}

.case-list .case-card strong {
  border-top: 0;
  padding-top: 0;
}

.contact-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 32px;
}

.contact-stack {
  display: grid;
  gap: 18px;
}

.contact-card a {
  color: var(--brand);
  font-weight: 600;
}

.contact-form {
  display: grid;
  gap: 16px;
  padding: 32px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.contact-form label {
  display: grid;
  gap: 8px;
  color: #344054;
  font-size: 14px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 1px solid #e4e7ec;
  border-radius: 8px;
  padding: 13px 14px;
  color: var(--ink);
  font: inherit;
  outline: none;
}

.contact-form textarea {
  min-height: 150px;
  resize: vertical;
}

.contact-form input:focus,
.contact-form textarea:focus {
  border-color: rgba(22, 93, 255, 0.45);
  box-shadow: 0 0 0 4px rgba(22, 93, 255, 0.08);
}

.section {
  padding: 96px 0;
}

.section.soft {
  background: var(--soft);
}

.section.compact {
  padding: 88px 0;
}

.section-heading {
  margin: 0 auto 64px;
  text-align: center;
}

.section-heading.tight {
  margin-bottom: 64px;
}

.section-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: 36px;
  font-weight: 600;
  line-height: 1.2;
}

.section-heading p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.55;
}

.business-grid,
.image-card-grid,
.stats-grid,
.case-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.business-card {
  min-height: 291px;
  padding: 32px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.business-card:hover,
.image-card:hover,
.case-card:hover {
  transform: translateY(-5px);
  border-color: rgba(22, 93, 255, 0.2);
  box-shadow: var(--shadow);
}

.icon-box {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  border-radius: 10px;
  background: rgba(22, 93, 255, 0.1);
}

.icon-box img {
  width: 28px;
  height: 28px;
}

.business-card h3,
.image-card h3,
.case-card h3 {
  margin: 0;
  color: var(--ink);
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
}

.business-card p {
  min-height: 72px;
  margin: 16px 0 18px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.6;
}

.business-card a,
.image-card a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 600;
}

.business-card a img,
.image-card a img {
  width: 16px;
  height: 16px;
}

.image-card {
  padding: 32px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
  text-align: center;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.image-card > img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
}

.image-card h3 {
  margin-top: 20px;
  margin-bottom: 12px;
}

.split-links {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}

.stats-grid {
  gap: 24px;
}

.stat-card {
  min-height: 128px;
  padding: 28px 20px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(22, 93, 255, 0.05), rgba(78, 139, 255, 0.05));
  text-align: center;
}

.stat-card strong {
  display: block;
  color: var(--brand);
  font-size: 42px;
  font-weight: 500;
  line-height: 1;
}

.stat-card span {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 15px;
}

.certificate-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.certificate-grid figure {
  margin: 0;
  text-align: center;
}

.certificate-grid img {
  width: 100%;
  aspect-ratio: 16 / 11;
  object-fit: cover;
  border-radius: 8px;
  background: #fff;
}

.certificate-grid figcaption {
  margin-top: 10px;
  color: #344054;
  font-size: 14px;
}

.network-layout {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  align-items: center;
  gap: 48px;
}

.network-image {
  overflow: hidden;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
}

.network-image img {
  width: 100%;
  min-height: 318px;
  object-fit: cover;
}

.regions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
}

.regions article {
  min-height: 112px;
  padding: 24px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(22, 93, 255, 0.05), rgba(78, 139, 255, 0.05));
  text-align: center;
}

.regions strong {
  display: block;
  color: var(--brand);
  font-size: 32px;
  font-weight: 500;
  line-height: 1.2;
}

.regions span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
}

.regions small {
  display: block;
  margin-top: 8px;
  color: #667085;
  font-size: 14px;
  line-height: 1.4;
}

.culture-card {
  text-align: center;
}

.culture-card .icon-box {
  margin-left: auto;
  margin-right: auto;
}

.narrow-heading {
  max-width: 768px;
  text-align: center;
}

.narrow-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: 36px;
  line-height: 1.2;
}

.narrow-heading p {
  margin: 24px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.7;
}

.business-detail-section {
  padding-top: 96px;
}

.business-flow {
  display: grid;
  gap: 48px;
}

.business-feature {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 48px;
}

.business-feature.reverse .business-feature-copy {
  order: 2;
}

.business-feature.reverse .business-feature-media {
  order: 1;
}

.business-feature-copy h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0;
  color: var(--ink);
  font-size: 30px;
  line-height: 1.25;
}

.business-feature-copy > p:not(.eyebrow) {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.65;
}

.title-icon {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
}

.title-icon img {
  width: 32px;
  height: 32px;
}

.business-feature-media {
  padding: 48px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
  box-shadow: 0 2px 8px rgba(16, 24, 40, 0.06);
}

.business-feature-media img {
  width: 100%;
  aspect-ratio: 2732 / 1534;
  border-radius: var(--radius);
  object-fit: cover;
}

.capability-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: 24px 0;
  padding: 0;
  list-style: none;
}

.capability-list li {
  position: relative;
  padding-left: 28px;
  color: #364153;
  font-size: 16px;
  line-height: 1.5;
}

.capability-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: rgba(22, 93, 255, 0.12);
  box-shadow: inset 0 0 0 5px #fff;
  outline: 1px solid rgba(22, 93, 255, 0.35);
}

.business-advantage-grid,
.value-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.case-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.case-card {
  min-height: 225px;
  padding: 32px;
  border: 1px solid #f3f4f6;
  border-radius: var(--radius);
  background: #fff;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.case-card span {
  display: inline-flex;
  margin-bottom: 18px;
  padding: 5px 12px;
  border-radius: 999px;
  color: var(--brand);
  background: rgba(22, 93, 255, 0.1);
  font-size: 12px;
}

.case-card p {
  margin: 12px 0 20px;
  color: var(--muted);
  font-size: 16px;
  line-height: 1.5;
}

.case-card strong {
  display: block;
  padding-top: 18px;
  border-top: 1px solid #f3f4f6;
  color: var(--brand);
  font-size: 14px;
  font-weight: 500;
}

.case-card .card-action a:not(.button) {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand);
  font-size: 14px;
  font-weight: 600;
}

.case-card .card-action img {
  width: 16px;
  height: 16px;
}

.center-action {
  display: flex;
  justify-content: center;
  margin-top: 40px;
}

.cta-section {
  padding: 96px 0;
  color: #fff;
  background: linear-gradient(135deg, #1961ff 0%, #4b88ff 100%);
  text-align: center;
}

.cta-inner h2 {
  margin: 0;
  font-size: 36px;
  line-height: 1.25;
}

.cta-inner p {
  margin: 18px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 18px;
  line-height: 1.55;
}

.cta-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.footer {
  padding: 64px 0 32px;
  color: #d1d5dc;
  background: var(--footer);
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 32px clamp(28px, 4vw, 56px);
  padding-bottom: 48px;
}

.footer-grid > section {
  flex: 0 1 auto;
  min-width: 0;
}

.footer-brand {
  max-width: 250px;
}

.footer h3 {
  margin: 0 0 16px;
  color: #fff;
  font-size: 18px;
  font-weight: 600;
}

.footer a,
.footer p {
  display: block;
  margin: 0;
  color: #d1d5dc;
  font-size: 14px;
  line-height: 1.8;
}

.footer section > a {
  margin-top: 10px;
}

.footer-brand p {
  max-width: 100%;
  margin-top: 22px;
  color: #99a1af;
}

.footer-logo {
  color: #fff;
}

.two-col-links {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 18px;
}

.contact-line {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 10px !important;
  line-height: 1.5;
  min-width: 0;
}

.contact-line img {
  flex-shrink: 0;
  width: 16px;
  height: 16px;
  margin-top: 0;
  align-self: center;
}

.contact-line > span,
.contact-line > a {
  flex: 0 1 auto;
  min-width: 0;
  line-height: 1.5;
}

.contact-line-address {
  align-items: flex-start;
}

.contact-line-address img {
  margin-top: 2px;
}

.footer-contact-wrap {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.footer-contact {
  width: max-content;
  max-width: 100%;
}

.footer-contact-info {
  flex: 1;
  min-width: 0;
}

.footer-qr-group {
  display: flex;
  gap: 12px;
  flex-shrink: 0;
}

.footer-qr-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  text-align: center;
}

.footer-qr-item span {
  font-size: 12px;
  color: #99a1af;
  white-space: nowrap;
}

.qr-placeholder,
.qr-img {
  display: block;
  width: 72px;
  height: 72px;
  border-radius: 8px;
  object-fit: cover;
}

.qr-placeholder {
  border: 1px dashed rgba(255, 255, 255, 0.25);
  background: rgba(255, 255, 255, 0.06);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  color: #6b7280;
  font-size: 13px;
  text-align: center;
}

@media (max-width: 1100px) {
  .about-page .page-hero.about-hero {
    /* 平板导航高度72px，同步补偿 */
    padding-top: 72px;
  }
  .about-page .page-hero.about-hero .container {
    padding-inline: 24px;
  }

  .container {
    width: min(100% - 40px, 920px);
  }

  .site-header,
  .nav-shell {
    height: 72px;
  }
  body {
    padding-top: 72px; /* 同步修改body内边距 */
  }
  .menu-button {
    display: block;
    order: 3;
  }

  .site-nav {
    position: absolute;
    top: 72px;
    left: 20px;
    right: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 16px;
    border: 1px solid #eef1f6;
    border-radius: 12px;
    background: #fff;
    box-shadow: var(--shadow);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    justify-content: flex-start;
  }

  .nav-cta {
    margin-left: auto;
  }

  .hero h1 {
    font-size: 48px;
  }

  .business-grid,
  .image-card-grid,
  .stats-grid,
  .certificate-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .network-layout {
    grid-template-columns: 1fr;
  }

  .case-grid,
  .feature-grid,
  .detail-grid,
  .contact-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-grid {
    gap: 28px 40px;
  }

  .footer-grid > section {
    flex: 1 1 calc(50% - 20px);
    min-width: 140px;
  }

  .footer-brand {
    max-width: none;
  }

  .footer-contact-wrap {
    flex-direction: column;
  }

  .footer-qr-group {
    align-self: flex-start;
  }

  .split-section,
  .business-feature,
  .case-list .case-card {
    grid-template-columns: 1fr;
  }

  .business-feature.reverse .business-feature-copy,
  .business-feature.reverse .business-feature-media {
    order: initial;
  }

  .business-advantage-grid,
  .value-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .about-page .page-hero.about-hero {
    min-height: 240px;
    padding-top: 72px;
  }
  .about-page .page-hero.about-hero .container {
    padding-inline: 16px; /* 手机端标准左右留白 */
  }
  .container {
    width: min(100% - 32px, 520px);
  }

  .brand {
    min-width: 0;
  }

  .brand img.brand-mark {
    height: 36px;
    max-width: 106px;
  }

  .footer-logo img {
    height: 36px;
    max-width: 36px;
  }

  .brand span {
    font-size: 15px;
  }

  .nav-cta {
    display: none;
  }

  .hero,
  .hero-inner {
    min-height: clamp(560px, calc(100svh - 104px), 650px);
  }

  .hero-inner {
    padding: 88px 0 112px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
    align-items: stretch;
    width: min(100%, 280px);
  }

  .section,
  .cta-section {
    padding: 72px 0;
  }

  .section-heading,
  .section-heading.tight {
    margin-bottom: 40px;
  }

  .section-heading h2,
  .cta-inner h2,
  .page-hero h1 {
    font-size: 28px;
  }

  .section-heading p:not(.eyebrow),
  .cta-inner p,
  .page-hero p {
    font-size: 16px;
  }

  .business-grid,
  .image-card-grid,
  .stats-grid,
  .certificate-grid,
  .case-grid,
  .regions,
  .feature-grid,
  .detail-grid,
  .contact-layout,
  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid > section {
    flex: 1 1 100%;
  }

  .business-card,
  .image-card,
  .case-card {
    padding: 28px;
  }

  .stat-card strong {
    font-size: 36px;
  }

  .regions strong {
    font-size: 28px;
  }

  .footer {
    padding-top: 48px;
  }

  .page-hero {
    padding: 72px 0 64px;
  }

  .page-hero.about-hero {
    min-height: 280px;
    padding: 64px 0;
  }

  .content-copy h2 {
    font-size: 28px;
  }

  .narrow-heading h2,
  .business-feature-copy h2 {
    font-size: 26px;
  }

  .narrow-heading p,
  .business-feature-copy > p:not(.eyebrow) {
    font-size: 16px;
  }

  .content-copy h3 {
    font-size: 24px;
  }

  .feature-card,
  .detail-card,
  .contact-card,
  .contact-form {
    padding: 26px;
  }

  .image-shell {
    padding: 24px;
  }

  .business-feature-media {
    padding: 18px;
  }

  .capability-list,
  .business-advantage-grid,
  .value-grid {
    grid-template-columns: 1fr;
  }

  .image-shell img {
    border-radius: 20px;
  }

  .case-list .case-card {
    grid-template-columns: 1fr;
    align-items: start;
  }
}