:root {
  --bg: #f6f8fc;
  --surface: #ffffff;
  --surface-soft: #f2f4fb;
  --text: #151b26;
  --muted: #677285;
  --line: rgba(24, 34, 56, .08);
  --primary: #2d7fff;
  --primary-2: #8d5cff;
  --shadow: 0 18px 46px rgba(46, 79, 132, .08);
  --shadow-soft: 0 10px 28px rgba(46, 79, 132, .06);
  --radius: 28px;
  --radius-sm: 20px;
  --container: 1240px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #f8faff 0%, #f5f7fc 40%, #ffffff 100%);
  line-height: 1.65;
}

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

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  padding: 10px 14px;
  background: #fff;
  border-radius: 10px;
  z-index: 999;
}

.container {
  width: min(var(--container), calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  backdrop-filter: saturate(180%) blur(16px);
  background: rgba(255, 255, 255, .86);
  border-bottom: 1px solid rgba(255, 255, 255, .36);
}

.header-inner {
  min-height: 84px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 32px;
  color: #1976ff;
  white-space: nowrap;
}

.brand img {
  width: 38px;
  height: 38px;
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.desktop-nav a,
.text-link {
  color: #1c2432;
  font-size: 16px;
  font-weight: 600;
}

.desktop-nav a:hover,
.text-link:hover {
  color: var(--primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.primary-btn,
.ghost-btn,
.float-btn,
.section-tabs a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  transition: .25s ease;
}

.primary-btn {
  min-height: 50px;
  padding: 0 26px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(90deg, var(--primary-2), var(--primary));
  box-shadow: 0 14px 28px rgba(62, 112, 255, .18);
}

.primary-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 34px rgba(62, 112, 255, .24);
}

.ghost-btn {
  min-height: 50px;
  padding: 0 24px;
  font-weight: 700;
  color: var(--primary);
  border: 1px solid rgba(45, 127, 255, .2);
  background: rgba(255, 255, 255, .82);
}

.ghost-btn:hover {
  background: #fff;
}

.small-btn {
  min-height: 42px;
  padding: 0 18px;
  font-size: 14px;
}

.large-btn {
  min-height: 58px;
  padding: 0 30px;
  font-size: 18px;
}

.full-btn {
  width: 100%;
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  margin: 5px auto;
  border-radius: 999px;
  background: #1b2230;
}

.mobile-menu {
  display: none;
  padding: 0 20px 18px;
  background: rgba(255, 255, 255, .98);
  border-top: 1px solid var(--line);
}

.mobile-menu.is-open {
  display: grid;
  gap: 12px;
}

.mobile-menu a {
  font-weight: 700;
  color: #1d2636;
}

.hero-section {
  padding: 44px 0 30px;
  background:
    radial-gradient(circle at top right, rgba(112, 163, 255, .16), transparent 34%),
    linear-gradient(180deg, rgba(233, 238, 255, .72) 0%, rgba(245, 247, 252, .9) 100%);
}

.hero-wrap {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .95fr);
  gap: 36px;
  align-items: center;
}

.hero-copy,
.download-copy {
  max-width: 660px;
}

.eyebrow {
  display: inline-block;
  margin: 0 0 14px;
  padding: 7px 14px;
  border-radius: 999px;
  background: rgba(45, 127, 255, .1);
  color: var(--primary);
  font-weight: 800;
  letter-spacing: .02em;
}

.hero-copy h1,
.download-copy h1 {
  margin: 0 0 16px;
  font-size: clamp(40px, 5vw, 68px);
  line-height: 1.15;
  letter-spacing: -.03em;
}

.hero-subtitle,
.download-copy p {
  margin: 0;
  font-size: 20px;
  color: #4e5970;
}

.hero-meta {
  margin: 14px 0 0;
  color: #738097;
  font-size: 16px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin: 28px 0 18px;
}

.hero-badges {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.hero-badges li {
  padding: 10px 16px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  border: 1px solid rgba(46, 79, 132, .08);
  font-weight: 700;
  color: #30405d;
}

.hero-panel,
.highlight-card {
  padding: 28px;
  border-radius: 36px;
  background: rgba(255, 255, 255, .82);
  border: 1px solid rgba(255, 255, 255, .72);
  box-shadow: var(--shadow);
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.large-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.download-card {
  position: relative;
  padding: 22px 16px 18px;
  min-height: 188px;
  border-radius: 26px;
  background: #f8f9fd;
  border: 1px solid rgba(33, 53, 86, .06);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  text-align: center;
  box-shadow: var(--shadow-soft);
}

.download-card:hover,
.feature-card:hover,
.solution-card:hover,
.service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 34px rgba(46, 79, 132, .11);
}

.download-card .platform-icon {
  width: 68px;
  height: 68px;
  object-fit: contain;
}

.download-card .platform-title {
  font-size: 18px;
  font-weight: 800;
  line-height: 1.35;
}

.download-card .platform-desc {
  font-size: 14px;
  color: var(--muted);
}

.download-card.qr-card .platform-icon {
  width: 120px;
  height: 120px;
}

.section-tab-wrap {
  position: sticky;
  top: 84px;
  z-index: 30;
  padding: 16px 0 0;
}

.section-tabs {
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
  padding: 8px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(16px);
  box-shadow: 0 12px 28px rgba(64, 84, 138, .08);
}

.section-tabs a {
  min-height: 48px;
  padding: 0 22px;
  font-weight: 800;
  color: #667189;
}

.section-tabs a.is-active,
.section-tabs a:hover {
  background: #fff;
  color: #222d3f;
  box-shadow: 0 8px 18px rgba(77, 98, 150, .08);
}

.feature-section,
.solutions-section,
.service-section,
.store-section,
.seo-section,
.download-platforms {
  padding: 88px 0;
}

.section-heading {
  margin-bottom: 34px;
}

.section-heading.center {
  text-align: center;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 3.6vw, 54px);
  line-height: 1.2;
}

.section-heading p {
  max-width: 820px;
  margin: 14px auto 0;
  color: var(--muted);
  font-size: 17px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.feature-card,
.solution-card,
.service-card {
  position: relative;
  height: 100%;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 30px;
  box-shadow: var(--shadow-soft);
  transition: .25s ease;
}

.feature-card {
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(180deg, #ffffff 0%, #f7f8fd 100%);
}

.feature-card h3,
.service-card h3,
.solution-card h3 {
  margin: 0 0 12px;
  font-size: 28px;
  line-height: 1.25;
}

.feature-card p,
.service-card p,
.solution-card p {
  margin: 0;
  color: var(--muted);
}

.feature-card img {
  width: 108px;
  height: 108px;
  margin-left: auto;
  object-fit: contain;
}

.highlight-section {
  padding-bottom: 34px;
}

.highlight-card {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: 26px;
  align-items: center;
  background: linear-gradient(135deg, rgba(237, 242, 255, .88), rgba(247, 239, 255, .78));
}

.highlight-copy h2 {
  margin: 0 0 18px;
  font-size: clamp(30px, 3vw, 48px);
}

.highlight-copy ul {
  margin: 0 0 28px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.highlight-copy li {
  position: relative;
  padding-left: 22px;
  color: #46536b;
  font-size: 17px;
}

.highlight-copy li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(90deg, var(--primary-2), var(--primary));
}

.highlight-media img {
  width: 100%;
  border-radius: 28px;
  box-shadow: 0 18px 28px rgba(97, 106, 154, .08);
}

.solution-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
}

.solution-card {
  overflow: hidden;
  padding: 0;
}

.solution-card img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.solution-card .solution-body {
  padding: 24px;
}

.solution-tag {
  display: inline-block;
  margin-bottom: 12px;
  font-weight: 700;
  color: var(--primary);
}

.solution-card .detail-link,
.service-card .detail-link {
  display: inline-flex;
  margin-top: 18px;
  color: var(--primary);
  font-weight: 800;
}

.service-grid {
  display: grid;
  grid-template-columns: 1.15fr 1.15fr 1fr 1fr;
  gap: 22px;
}

.service-card {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  background: linear-gradient(180deg, #f7f8ff 0%, #ffffff 100%);
}

.service-card.tall {
  min-height: 380px;
  grid-row: span 2;
}

.service-card img {
  width: 100%;
  max-height: 220px;
  object-fit: contain;
  object-position: center right;
}

.store-section {
  background: linear-gradient(180deg, rgba(248, 249, 252, .4) 0%, rgba(245, 247, 252, .9) 100%);
}

.soft-gradient {
  background: linear-gradient(135deg, rgba(227, 239, 255, .82), rgba(249, 246, 255, .88));
}

.store-badges {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 24px;
}

.store-badge {
  width: 240px;
  min-height: 82px;
  padding: 12px 18px;
  border-radius: 20px;
  background: #000;
  display: inline-flex;
  align-items: center;
  gap: 14px;
  justify-content: flex-start;
  box-shadow: var(--shadow-soft);
  color: #fff;
}

.store-badge-icon {
  width: 40px;
  height: 40px;
  object-fit: contain;
  flex: 0 0 40px;
}

.store-badge-text {
  display: grid;
  line-height: 1.2;
}

.store-badge-text strong {
  font-size: 18px;
  font-weight: 800;
}

.store-badge-text span {
  font-size: 12px;
  color: rgba(255, 255, 255, .72);
}

.seo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  gap: 26px;
  align-items: start;
}

.single-col {
  grid-template-columns: 1fr;
}

.seo-copy,
.faq-list details {
  padding: 30px;
  border-radius: 28px;
  background: var(--surface);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-soft);
}

.seo-copy h2 {
  margin: 0 0 16px;
  font-size: 34px;
}

.seo-copy p {
  margin: 0 0 14px;
  color: #526076;
}

.faq-list {
  display: grid;
  gap: 16px;
}

.faq-list summary {
  cursor: pointer;
  font-size: 18px;
  font-weight: 800;
  list-style: none;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list details p {
  margin: 14px 0 0;
  color: #58657a;
}

.floating-service {
  position: fixed;
  right: 16px;
  bottom: 18px;
  z-index: 55;
  display: grid;
  gap: 10px;
  align-items: end;
}

.assistant-card {
  display: grid;
  justify-items: center;
  gap: 8px;
}

.assistant-card img {
  width: 82px;
}

.assistant-card a {
  padding: 10px 12px;
  text-align: center;
  font-size: 14px;
  line-height: 1.45;
  color: #7a4dfc;
  background: rgba(255, 255, 255, .96);
  border-radius: 18px;
  border: 1px solid rgba(123, 93, 247, .12);
  box-shadow: var(--shadow-soft);
}

.float-btn {
  width: 62px;
  height: 62px;
  border-radius: 22px;
  font-size: 14px;
  font-weight: 800;
  color: #34415a;
  background: rgba(255, 255, 255, .96);
  box-shadow: var(--shadow-soft);
}

.float-btn:hover {
  color: var(--primary);
}

.site-footer {
  padding: 44px 0 20px;
  background: linear-gradient(180deg, rgba(247, 248, 252, .4) 0%, rgba(242, 244, 248, .9) 100%);
  border-top: 1px solid rgba(23, 38, 60, .05);
}

.footer-top {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 26px;
  padding-bottom: 26px;
}

.footer-top h3 {
  margin: 0 0 16px;
  font-size: 24px;
}

.footer-top ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-top li a,
.footer-top p,
.footer-bottom,
.footer-note {
  color: #6a7588;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 16px;
}

.footer-bottom {
  padding-top: 22px;
  border-top: 1px solid rgba(23, 38, 60, .08);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 18px;
  font-size: 14px;
}

.footer-note {
  max-width: 560px;
}

.compact-header .header-inner {
  min-height: 78px;
}

.slim-nav {
  gap: 26px;
}

.download-hero {
  padding: 54px 0 42px;
  background:
    radial-gradient(circle at top right, rgba(117, 187, 255, .32), transparent 22%),
    radial-gradient(circle at top left, rgba(135, 227, 255, .26), transparent 16%),
    linear-gradient(180deg, rgba(230, 242, 255, .98) 0%, rgba(244, 247, 252, .82) 100%);
}

.download-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, .72fr);
  gap: 32px;
  align-items: center;
}

.download-art {
  display: grid;
  place-items: center;
  min-height: 360px;
}

.download-art img {
  width: min(360px, 72%);
  filter: drop-shadow(0 24px 34px rgba(45, 127, 255, .18));
}

.page-download .download-grid {
  gap: 18px;
}

.page-download .download-card {
  min-height: 220px;
}

.simple-footer .footer-bottom {
  justify-content: space-between;
}

.hide-mobile {
  display: inline-flex;
}

@media (max-width: 1280px) {
  .feature-grid,
  .solution-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .service-card.tall {
    grid-row: auto;
    min-height: 320px;
  }

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

@media (max-width: 980px) {
  .desktop-nav,
  .hide-mobile {
    display: none;
  }

  .menu-toggle {
    display: inline-block;
  }

  .site-header {
    position: sticky;
  }

  .header-inner {
    min-height: 72px;
  }

  .brand {
    font-size: 28px;
  }

  .hero-wrap,
  .download-hero-inner,
  .highlight-card,
  .seo-layout,
  .footer-top {
    grid-template-columns: 1fr;
  }

  .hero-copy h1,
  .download-copy h1 {
    font-size: 42px;
  }

  .hero-subtitle,
  .download-copy p {
    font-size: 17px;
  }

  .section-tab-wrap {
    top: 72px;
  }

  .download-grid,
  .large-grid,
  .feature-grid,
  .solution-grid,
  .service-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .floating-service {
    right: 10px;
    bottom: 12px;
  }

  .assistant-card img {
    width: 72px;
  }
}

@media (max-width: 640px) {
  body {
    background: linear-gradient(180deg, #f6f8fe 0%, #ffffff 100%);
  }

  .container {
    width: min(100% - 24px, var(--container));
  }

  .header-inner {
    min-height: 66px;
    gap: 12px;
  }

  .brand {
    font-size: 24px;
    gap: 10px;
  }

  .brand img {
    width: 28px;
    height: 28px;
  }

  .hero-section,
  .download-hero {
    padding: 22px 0 24px;
  }

  .hero-copy,
  .download-copy {
    text-align: center;
    max-width: none;
  }

  .eyebrow {
    font-size: 13px;
    margin-bottom: 10px;
  }

  .hero-copy h1,
  .download-copy h1 {
    font-size: 32px;
    margin-bottom: 10px;
  }

  .hero-subtitle,
  .download-copy p {
    font-size: 16px;
  }

  .hero-meta {
    font-size: 14px;
  }

  .hero-links {
    justify-content: center;
    margin: 20px 0 16px;
  }

  .hero-badges {
    justify-content: center;
  }

  .hero-panel,
  .highlight-card,
  .seo-copy,
  .faq-list details,
  .feature-card,
  .solution-card,
  .service-card {
    border-radius: 22px;
  }

  .hero-panel {
    padding: 16px;
  }

  .download-grid,
  .large-grid,
  .feature-grid,
  .solution-grid,
  .service-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .download-card {
    min-height: 148px;
    padding: 18px 14px;
  }

  .download-card .platform-icon {
    width: 56px;
    height: 56px;
  }

  .download-card.qr-card {
    display: none;
  }

  .feature-section,
  .solutions-section,
  .service-section,
  .store-section,
  .seo-section,
  .download-platforms {
    padding: 54px 0;
  }

  .section-heading {
    margin-bottom: 24px;
  }

  .section-heading h2,
  .highlight-copy h2,
  .seo-copy h2 {
    font-size: 24px;
  }

  .section-heading p,
  .seo-copy p,
  .highlight-copy li,
  .feature-card p,
  .service-card p,
  .solution-card p {
    font-size: 14px;
  }

  .feature-card {
    min-height: auto;
    padding: 22px;
  }

  .feature-card h3,
  .service-card h3,
  .solution-card h3 {
    font-size: 20px;
  }

  .feature-card img {
    width: 84px;
    height: 84px;
  }

  .highlight-card {
    padding: 18px;
  }

  .highlight-copy ul {
    margin-bottom: 20px;
  }

  .solution-card .solution-body {
    padding: 18px;
  }

  .store-badges {
    gap: 16px;
  }

  .store-badge {
    width: 100%;
    max-width: 290px;
  }

  .section-tabs {
    width: 100%;
    justify-content: center;
  }

  .section-tabs a {
    min-height: 42px;
    padding: 0 14px;
    font-size: 14px;
  }

  .section-tab-wrap {
    top: 66px;
    padding-top: 10px;
  }

  .floating-service {
    right: 8px;
    bottom: 10px;
    gap: 8px;
  }

  .assistant-card img {
    width: 62px;
  }

  .assistant-card a {
    font-size: 12px;
    padding: 8px 10px;
  }

  .float-btn {
    width: 48px;
    height: 48px;
    border-radius: 16px;
    font-size: 12px;
  }

  .footer-top {
    gap: 18px;
  }

  .footer-top h3 {
    font-size: 18px;
    margin-bottom: 10px;
  }

  .footer-bottom {
    font-size: 13px;
  }
}