:root {
  --mist: #e8f4f8;
  --blue: #a8d8ea;
  --blue-deep: #397b96;
  --pink: #f4b8c8;
  --pink-deep: #a94f6b;
  --ink: #2a3a4a;
  --muted: #647687;
  --white: #ffffff;
  --cream: #fffdf8;
  --line: #d6e7ed;
  --shadow: 0 12px 30px rgba(42, 58, 74, 0.09);
  --radius: 8px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--mist);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: var(--white);
  transform: translateY(-150%);
}

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(168, 216, 234, 0.75);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 1.14rem;
  font-weight: 800;
  color: var(--ink);
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 8px 12px;
  border-radius: 6px;
  color: #405466;
  font-size: 0.94rem;
  font-weight: 700;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: var(--mist);
  color: var(--blue-deep);
}

.site-nav .nav-download {
  background: var(--pink);
  color: #6f2e43;
}

.site-nav .nav-download:hover {
  background: #f1a8bc;
  color: #5f2437;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: var(--ink);
  cursor: pointer;
}

.menu-toggle svg {
  width: 22px;
  height: 22px;
  margin: auto;
}

.hero {
  min-height: 620px;
  display: grid;
  align-items: center;
  padding: 72px 0 84px;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(350px, 0.92fr);
  align-items: center;
  gap: clamp(40px, 7vw, 90px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 18px;
  color: #3e7086;
  font-size: 0.88rem;
  font-weight: 800;
}

.eyebrow::before {
  width: 24px;
  height: 3px;
  background: var(--pink);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.24;
  letter-spacing: 0;
}

h1 {
  max-width: 700px;
  margin-bottom: 22px;
  font-size: 4.2rem;
  font-weight: 850;
}

.hero-copy > p {
  max-width: 660px;
  margin: 0 0 28px;
  color: #506577;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}

.button {
  min-height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: var(--pink);
  color: #6d2c41;
  box-shadow: 0 8px 20px rgba(169, 79, 107, 0.18);
}

.button-secondary {
  border-color: #89c5dc;
  background: var(--white);
  color: #326d86;
}

.button svg {
  width: 19px;
  height: 19px;
}

.trust-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin: 0;
  padding: 0;
  color: #617485;
  font-size: 0.9rem;
  list-style: none;
}

.trust-line li::before {
  margin-right: 7px;
  color: #4c92aa;
  content: "\2713";
  font-weight: 900;
}

.sync-visual {
  position: relative;
  min-height: 440px;
  display: grid;
  place-items: center;
}

.sync-orbit {
  position: relative;
  width: min(390px, 100%);
  aspect-ratio: 1 / 1;
  border: 1px dashed #83c2d9;
  border-radius: 50%;
}

.sync-core {
  position: absolute;
  inset: 50% auto auto 50%;
  width: 178px;
  height: 178px;
  display: grid;
  place-items: center;
  padding: 22px;
  border: 8px solid rgba(255, 255, 255, 0.86);
  border-radius: 50%;
  background: var(--blue);
  box-shadow: var(--shadow);
  text-align: center;
  transform: translate(-50%, -50%);
}

.sync-core strong {
  display: block;
  font-size: 1.15rem;
}

.sync-core span {
  color: #35586a;
  font-size: 0.82rem;
}

.device-chip {
  position: absolute;
  min-width: 118px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 0 10px 24px rgba(42, 58, 74, 0.09);
  font-size: 0.86rem;
  font-weight: 800;
  text-align: center;
}

.device-chip small {
  display: block;
  color: var(--muted);
  font-weight: 500;
}

.device-a {
  top: 9%;
  left: -3%;
}

.device-b {
  top: 19%;
  right: -5%;
}

.device-c {
  right: 5%;
  bottom: 8%;
}

.device-d {
  bottom: 15%;
  left: -7%;
}

section {
  padding: 82px 0;
}

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

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

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 32px;
}

.section-head h2 {
  max-width: 650px;
  margin-bottom: 0;
  font-size: 2.35rem;
}

.section-kicker {
  color: var(--pink-deep);
  font-size: 0.78rem;
  font-weight: 900;
  text-transform: uppercase;
}

.scene-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.scene-card {
  min-height: 250px;
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--blue);
  border-radius: var(--radius);
  background: var(--white);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.scene-card:nth-child(2n) {
  border-top-color: var(--pink);
}

.scene-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.scene-icon {
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border-radius: 50%;
  background: var(--mist);
  font-size: 1.35rem;
}

.scene-card h3 {
  margin-bottom: 14px;
  font-size: 1.05rem;
}

.work-list {
  margin: 0;
  padding: 0;
  color: #617384;
  font-size: 0.9rem;
  list-style: none;
}

.work-list li {
  padding: 5px 0;
  border-bottom: 1px solid #edf3f5;
}

.work-list li:last-child {
  border-bottom: 0;
}

.stats-band {
  padding: 36px 0;
  background: var(--ink);
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat {
  padding: 10px 30px;
  border-right: 1px solid rgba(255, 255, 255, 0.18);
}

.stat:last-child {
  border-right: 0;
}

.stat strong {
  display: block;
  color: var(--blue);
  font-size: 2.15rem;
  line-height: 1.2;
}

.stat span {
  color: #d5e2e8;
  font-size: 0.9rem;
}

.preview-grid {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(0, 1.18fr);
  align-items: center;
  gap: clamp(40px, 7vw, 88px);
}

.app-preview {
  width: min(100%, 390px);
  max-width: 400px;
  margin: 0 auto;
  border: 10px solid #23313f;
  border-radius: 28px;
  box-shadow: 0 26px 60px rgba(42, 58, 74, 0.2);
}

.preview-copy h2 {
  margin-bottom: 28px;
  font-size: 2.35rem;
}

.feature-list {
  display: grid;
  gap: 14px;
}

.feature-item {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.feature-item:last-child {
  border-bottom: 0;
}

.feature-number {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--pink);
  color: #6b2f43;
  font-size: 0.82rem;
  font-weight: 900;
}

.feature-item h3 {
  margin-bottom: 4px;
  font-size: 1rem;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.sync-flow {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  counter-reset: sync-step;
}

.sync-step {
  position: relative;
  min-height: 220px;
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  counter-increment: sync-step;
}

.sync-step::before {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  margin-bottom: 24px;
  border-radius: 50%;
  background: var(--blue);
  color: #245a70;
  content: counter(sync-step, decimal-leading-zero);
  font-size: 0.78rem;
  font-weight: 900;
}

.sync-step h3 {
  margin-bottom: 9px;
  font-size: 1.05rem;
}

.sync-step p {
  margin: 0;
  color: var(--muted);
  font-size: 0.91rem;
}

.content-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.content-link {
  position: relative;
  min-height: 230px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
}

.content-link::after {
  position: absolute;
  right: 26px;
  bottom: 18px;
  color: var(--pink-deep);
  content: "\2192";
  font-size: 2rem;
  transition: transform 180ms ease;
}

.content-link:hover::after {
  transform: translateX(5px);
}

.content-link .tag {
  display: inline-block;
  margin-bottom: 20px;
  color: var(--blue-deep);
  font-size: 0.78rem;
  font-weight: 900;
}

.content-link h3 {
  margin-bottom: 10px;
  font-size: 1.35rem;
}

.content-link p {
  max-width: 88%;
  margin: 0;
  color: var(--muted);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.review-card {
  margin: 0;
  padding: 26px;
  border-left: 4px solid var(--pink);
  background: var(--white);
  box-shadow: 0 8px 24px rgba(42, 58, 74, 0.06);
}

.review-card blockquote {
  margin: 0 0 20px;
  color: #435768;
}

.review-card figcaption {
  color: var(--muted);
  font-size: 0.85rem;
}

.stars {
  color: #c66784;
  letter-spacing: 2px;
}

.faq-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  align-items: start;
  gap: 12px 18px;
}

.faq-list details {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.faq-list summary {
  position: relative;
  padding: 18px 50px 18px 20px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
}

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

.faq-list summary::after {
  position: absolute;
  top: 17px;
  right: 20px;
  color: var(--blue-deep);
  content: "+";
  font-size: 1.25rem;
}

.faq-list details[open] summary::after {
  content: "\2212";
}

.faq-answer {
  padding: 0 20px 20px;
  color: var(--muted);
  font-size: 0.92rem;
}

.faq-answer p {
  margin: 0;
}

.download-band {
  padding: 54px 0;
  background: var(--blue);
}

.download-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.download-inner h2 {
  margin-bottom: 8px;
  font-size: 2.15rem;
}

.download-inner p {
  margin: 0;
  color: #385f71;
}

.site-footer {
  padding: 38px 0 24px;
  background: var(--ink);
  color: #d7e3e9;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 40px;
  padding-bottom: 28px;
}

.footer-brand {
  margin-bottom: 12px;
  color: var(--white);
}

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

.site-footer p {
  max-width: 760px;
  margin: 0;
  color: #b9c9d1;
  font-size: 0.84rem;
}

.footer-nav {
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.footer-nav a {
  color: #dce8ed;
  font-size: 0.88rem;
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
}

.footer-bottom p + p {
  margin-top: 8px;
}

.sub-hero {
  padding: 76px 0 66px;
  background: var(--mist);
}

.sub-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(290px, 0.65fr);
  align-items: center;
  gap: 60px;
}

.sub-hero h1 {
  max-width: 760px;
  font-size: 3.8rem;
}

.sub-hero p {
  max-width: 720px;
  margin: 0 0 24px;
  color: #526779;
}

.topic-panel {
  padding: 26px;
  border: 1px solid #c7e2eb;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.86);
}

.topic-panel strong {
  display: block;
  margin-bottom: 14px;
}

.topic-panel ul {
  margin: 0;
  padding-left: 20px;
  color: var(--muted);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  align-items: start;
  gap: 52px;
}

.article-body {
  min-width: 0;
}

.article-body section {
  padding: 0 0 54px;
}

.article-body h2 {
  margin-bottom: 22px;
  font-size: 2rem;
}

.article-body h3 {
  margin: 28px 0 10px;
  font-size: 1.12rem;
}

.article-body p {
  margin: 0 0 16px;
  color: #4e6273;
}

.article-body a {
  color: #28718d;
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: var(--pink);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.step-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  counter-reset: article-step;
  list-style: none;
}

.step-list li {
  position: relative;
  min-height: 72px;
  padding: 16px 18px 16px 66px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  color: #4e6273;
  counter-increment: article-step;
}

.step-list li::before {
  position: absolute;
  top: 16px;
  left: 18px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--blue);
  color: #285f75;
  content: counter(article-step);
  font-size: 0.82rem;
  font-weight: 900;
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.info-table th,
.info-table td {
  padding: 15px 16px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info-table th {
  width: 28%;
  background: #f2f9fb;
  color: #385d6e;
}

.note {
  margin: 20px 0;
  padding: 18px 20px;
  border-left: 4px solid var(--pink);
  background: #fff7f9;
  color: #5e5060;
}

.article-side {
  position: sticky;
  top: 96px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
}

.article-side strong {
  display: block;
  margin-bottom: 12px;
}

.article-side a {
  display: block;
  padding: 8px 0;
  border-bottom: 1px solid #edf3f5;
  color: #526879;
  font-size: 0.9rem;
}

.article-side a:last-child {
  border-bottom: 0;
}

.related-strip {
  padding: 46px 0;
  background: var(--cream);
}

.related-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.related-inner h2 {
  margin-bottom: 6px;
}

.related-inner p {
  margin: 0;
  color: var(--muted);
}

.reveal {
  opacity: 1;
  transform: none;
  transition: opacity 500ms ease, transform 500ms ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .button,
  .scene-card,
  .content-link::after {
    transition: none;
  }
}

@media (max-width: 980px) {
  .scene-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .sync-flow {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .article-side {
    position: static;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0 18px;
  }

  .article-side strong {
    grid-column: 1 / -1;
  }
}

@media (max-width: 780px) {
  .container {
    width: min(100% - 28px, var(--max));
  }

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    position: fixed;
    inset: 73px 14px auto;
    display: none;
    padding: 14px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: var(--white);
    box-shadow: var(--shadow);
  }

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

  .site-nav a {
    padding: 12px 14px;
  }

  .hero {
    min-height: auto;
    padding: 56px 0 64px;
  }

  .hero-grid,
  .sub-hero-grid,
  .preview-grid {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    gap: 28px;
  }

  h1 {
    font-size: 3.2rem;
  }

  .sync-visual {
    min-height: 390px;
  }

  .sync-orbit {
    width: min(330px, 92%);
  }

  .sync-core {
    width: 150px;
    height: 150px;
  }

  section {
    padding: 64px 0;
  }

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

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 0;
  }

  .stat:nth-child(2) {
    border-right: 0;
  }

  .stat {
    padding: 10px 20px;
  }

  .content-links,
  .review-grid,
  .faq-list {
    grid-template-columns: 1fr;
  }

  .download-inner,
  .related-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .footer-nav {
    justify-content: flex-start;
  }

  .sub-hero {
    padding: 56px 0;
  }

  .sub-hero-grid {
    gap: 30px;
  }
}

@media (max-width: 520px) {
  h1,
  .sub-hero h1 {
    font-size: 2.7rem;
  }

  .section-head h2,
  .preview-copy h2,
  .download-inner h2,
  .article-body h2 {
    font-size: 1.8rem;
  }

  .brand {
    font-size: 1rem;
  }

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

  .scene-grid,
  .sync-flow {
    grid-template-columns: 1fr;
  }

  .scene-card {
    min-height: auto;
  }

  .sync-step {
    min-height: auto;
  }

  .sync-visual {
    min-height: 350px;
  }

  .sync-orbit {
    width: 285px;
  }

  .device-chip {
    min-width: 100px;
    padding: 9px 10px;
    font-size: 0.76rem;
  }

  .device-a {
    left: -2%;
  }

  .device-b {
    right: -3%;
  }

  .device-c {
    right: 0;
  }

  .device-d {
    left: -2%;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat,
  .stat:nth-child(2) {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  }

  .stat:last-child {
    border-bottom: 0;
  }

  .article-side {
    grid-template-columns: 1fr;
  }

  .info-table,
  .info-table tbody,
  .info-table tr,
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table tr + tr {
    margin-top: 10px;
  }
}