:root {
  --ink: #11202c;
  --muted: #5e6c76;
  --paper: #f4f7f7;
  --white: #ffffff;
  --navy: #071827;
  --navy-soft: #10283a;
  --mint: #2ed3b7;
  --mint-dark: #087b6d;
  --gold: #f5c451;
  --coral: #ff7868;
  --line: #dbe3e5;
  --shadow: 0 20px 55px rgba(4, 24, 38, 0.16);
  --container: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0;
}

body.nav-open {
  overflow: hidden;
}

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

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

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

button {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 8px 12px;
  color: var(--navy);
  background: var(--gold);
  transform: translateY(-160%);
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 76px;
  border-bottom: 1px solid rgba(219, 227, 229, 0.85);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  min-width: 154px;
  font-size: 19px;
  font-weight: 800;
  line-height: 1;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 10px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 30px;
}

.site-nav a:not(.download-button) {
  position: relative;
  padding: 26px 0 22px;
  color: #43515b;
  font-size: 15px;
  font-weight: 650;
}

.site-nav a:not(.download-button)::after {
  position: absolute;
  right: 0;
  bottom: 15px;
  left: 0;
  height: 2px;
  background: var(--mint-dark);
  content: "";
  transform: scaleX(0);
  transition: transform 180ms ease;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--navy);
}

.site-nav a:hover::after,
.site-nav a.active::after {
  transform: scaleX(1);
}

.download-button,
.text-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  border: 0;
  border-radius: 6px;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, background 180ms ease;
}

.download-button {
  min-width: 128px;
  padding: 0 24px;
  color: #05241f;
  background: var(--mint);
  box-shadow: 0 9px 24px rgba(46, 211, 183, 0.22);
}

.download-button:hover,
.download-button:focus-visible {
  background: #44e1c5;
  box-shadow: 0 12px 30px rgba(46, 211, 183, 0.31);
  transform: translateY(-2px);
}

.download-button.dark {
  color: var(--white);
  background: var(--navy);
  box-shadow: 0 9px 24px rgba(7, 24, 39, 0.18);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 21px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
  transition: transform 180ms ease, opacity 180ms ease;
}

.menu-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 626px;
  color: var(--white);
  background: var(--navy);
}

.hero::before,
.hero::after {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 74px 48px 0 rgba(255, 255, 255, 0.65), 188px 5px 0 var(--mint), 302px 82px 0 rgba(255, 255, 255, 0.45), 420px 18px 0 var(--gold), 565px 92px 0 rgba(255, 255, 255, 0.45);
  content: "";
  opacity: 0.65;
}

.hero::before {
  top: 62px;
  left: 4%;
}

.hero::after {
  right: 7%;
  bottom: 90px;
  transform: rotate(180deg);
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.04fr) minmax(370px, 0.96fr);
  align-items: center;
  gap: 48px;
  min-height: 626px;
  padding: 56px 0 48px;
}

.eyebrow {
  margin: 0 0 18px;
  color: var(--mint);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 680px;
  margin: 0;
  font-size: clamp(42px, 5.1vw, 72px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-copy > p:not(.eyebrow) {
  max-width: 660px;
  margin: 24px 0 0;
  color: #c9d6df;
  font-size: 18px;
  line-height: 1.85;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
}

.hero-actions .download-button {
  min-width: 152px;
  min-height: 54px;
}

.hero-note {
  color: #9eb0bc;
  font-size: 13px;
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  margin: 34px 0 0;
  padding: 25px 0 0;
  border-top: 1px solid rgba(255, 255, 255, 0.13);
  list-style: none;
}

.hero-facts li {
  min-width: 104px;
}

.hero-facts strong,
.hero-facts span {
  display: block;
}

.hero-facts strong {
  color: var(--white);
  font-size: 21px;
  line-height: 1.2;
}

.hero-facts span {
  margin-top: 5px;
  color: #8da3b2;
  font-size: 12px;
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  min-height: 520px;
}

.phone-frame {
  position: absolute;
  overflow: hidden;
  width: 282px;
  padding: 9px;
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 30px;
  background: #02080e;
  box-shadow: 0 34px 75px rgba(0, 0, 0, 0.42);
}

.phone-frame img {
  width: 100%;
  max-width: 400px;
  border-radius: 22px;
}

.phone-main {
  top: 0;
  right: 44px;
  z-index: 2;
  transform: rotate(2deg);
}

.phone-back {
  top: 68px;
  left: 20px;
  z-index: 1;
  opacity: 0.77;
  transform: rotate(-7deg) scale(0.88);
}

.orbit-label {
  position: absolute;
  right: 0;
  bottom: 42px;
  z-index: 3;
  width: 144px;
  padding: 15px 16px;
  border-left: 3px solid var(--gold);
  color: #dbe7ec;
  background: #173248;
  font-size: 13px;
  line-height: 1.55;
  box-shadow: var(--shadow);
}

.section {
  padding: 92px 0;
}

.section.compact {
  padding: 72px 0;
}

.section-heading {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 42px;
}

.section-heading h2,
.section-heading h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(30px, 3.5vw, 48px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-kicker {
  margin: 0 0 9px;
  color: var(--mint-dark);
  font-size: 12px;
  font-weight: 900;
  text-transform: uppercase;
}

.section-index {
  color: #9aa7ad;
  font-size: 13px;
  font-weight: 800;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.path-item {
  min-height: 238px;
  padding: 34px 30px 30px;
  border-right: 1px solid var(--line);
}

.path-item:last-child {
  border-right: 0;
}

.path-number {
  display: inline-grid;
  width: 38px;
  height: 38px;
  place-items: center;
  border-radius: 50%;
  color: var(--navy);
  background: var(--gold);
  font-weight: 900;
}

.path-item:nth-child(even) .path-number {
  background: var(--mint);
}

.path-item h3 {
  margin: 24px 0 8px;
  font-size: 21px;
}

.path-item p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.screens-section {
  color: var(--white);
  background: var(--navy-soft);
}

.screens-section .section-kicker {
  color: var(--gold);
}

.screen-stage {
  display: grid;
  grid-template-columns: 1.3fr repeat(3, minmax(0, 0.72fr));
  align-items: end;
  gap: 18px;
}

.screen-item {
  min-width: 0;
}

.screen-item img {
  width: 100%;
  max-width: 400px;
  border: 6px solid #020a10;
  border-radius: 17px;
  box-shadow: 0 24px 55px rgba(0, 0, 0, 0.3);
}

.screen-item.landscape img {
  border-radius: 12px;
}

.screen-item figcaption {
  margin-top: 14px;
  color: #a9bbc6;
  font-size: 13px;
}

.screen-item figcaption strong {
  display: block;
  color: var(--white);
  font-size: 15px;
}

.feature-rows {
  border-top: 1px solid var(--line);
}

.feature-row {
  display: grid;
  grid-template-columns: 100px 0.75fr 1.45fr;
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--line);
}

.feature-row .tag {
  color: var(--mint-dark);
  font-size: 12px;
  font-weight: 900;
}

.feature-row h3 {
  margin: 0;
  font-size: 22px;
}

.feature-row p {
  margin: 0;
  color: var(--muted);
}

.deep-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.deep-link {
  min-height: 310px;
  padding: 46px;
  background: var(--white);
  transition: background 180ms ease;
}

.deep-link:hover {
  background: #eef8f5;
}

.deep-link small {
  color: var(--coral);
  font-weight: 900;
}

.deep-link h3 {
  max-width: 430px;
  margin: 38px 0 16px;
  font-size: 32px;
  line-height: 1.25;
}

.deep-link p {
  max-width: 500px;
  margin: 0;
  color: var(--muted);
}

.deep-link .arrow {
  display: inline-block;
  margin-top: 30px;
  color: var(--mint-dark);
  font-size: 24px;
  font-weight: 900;
}

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

.review-card {
  min-height: 220px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.review-stars {
  color: #d59800;
  font-size: 15px;
}

.review-card blockquote {
  margin: 22px 0 24px;
  color: #33434d;
}

.review-card cite {
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-item {
  border-bottom: 1px solid var(--line);
}

.faq-question {
  display: grid;
  grid-template-columns: 1fr 32px;
  align-items: center;
  gap: 20px;
  width: 100%;
  padding: 24px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.faq-question strong {
  font-size: 18px;
}

.faq-icon {
  position: relative;
  width: 28px;
  height: 28px;
  border: 1px solid #b8c5c9;
  border-radius: 50%;
}

.faq-icon::before,
.faq-icon::after {
  position: absolute;
  top: 13px;
  left: 7px;
  width: 12px;
  height: 2px;
  background: var(--ink);
  content: "";
}

.faq-icon::after {
  transform: rotate(90deg);
  transition: transform 180ms ease;
}

.faq-question[aria-expanded="true"] .faq-icon::after {
  transform: rotate(0);
}

.faq-answer {
  display: none;
  max-width: 890px;
  padding: 0 52px 24px 0;
  color: var(--muted);
}

.faq-answer p {
  margin: 0;
}

.faq-answer.open {
  display: block;
}

.download-band {
  padding: 66px 0;
  color: var(--navy);
  background: var(--gold);
}

.download-band-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.download-band h2 {
  max-width: 670px;
  margin: 0;
  font-size: clamp(30px, 4vw, 50px);
  line-height: 1.2;
}

.download-band p {
  margin: 12px 0 0;
  color: #56420c;
}

.page-hero {
  padding: 76px 0 68px;
  color: var(--white);
  background: var(--navy);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 30px;
  color: #8fa5b4;
  font-size: 13px;
}

.breadcrumbs a:hover {
  color: var(--mint);
}

.page-hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 70px;
  align-items: end;
}

.page-hero h1 {
  margin: 0;
  font-size: clamp(38px, 5vw, 66px);
  line-height: 1.12;
}

.page-hero p {
  margin: 18px 0 0;
  color: #b9c9d3;
  font-size: 17px;
}

.page-summary {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: rgba(255, 255, 255, 0.14);
}

.page-summary span {
  min-height: 92px;
  padding: 20px;
  background: var(--navy);
  color: #91a7b6;
  font-size: 12px;
}

.page-summary strong {
  display: block;
  color: var(--white);
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 290px;
  gap: 74px;
  align-items: start;
}

.article-content h2 {
  margin: 70px 0 22px;
  font-size: 32px;
  line-height: 1.3;
}

.article-content h2:first-child {
  margin-top: 0;
}

.article-content h3 {
  margin: 34px 0 12px;
  font-size: 21px;
}

.article-content p {
  margin: 0 0 18px;
  color: #41515b;
}

.article-content ul,
.article-content ol {
  margin: 18px 0 28px;
  padding-left: 24px;
  color: #41515b;
}

.article-content li + li {
  margin-top: 10px;
}

.article-preview {
  max-width: 502px;
  margin: 36px auto;
}

.article-preview.portrait {
  max-width: 302px;
}

.article-preview figcaption strong {
  color: var(--ink);
}

.step-list {
  counter-reset: steps;
  border-top: 1px solid var(--line);
}

.step {
  position: relative;
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 24px;
  padding: 34px 0;
  border-bottom: 1px solid var(--line);
  counter-increment: steps;
}

.step::before {
  display: grid;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 50%;
  color: var(--navy);
  background: var(--mint);
  content: counter(steps, decimal-leading-zero);
  font-weight: 900;
}

.step h3 {
  margin: 3px 0 10px;
}

.step p {
  margin-bottom: 12px;
}

.notice {
  margin: 28px 0;
  padding: 20px 22px;
  border-left: 4px solid var(--gold);
  background: #fff8df;
  color: #51451f;
}

.article-aside {
  position: sticky;
  top: 104px;
  padding: 26px 0;
  border-top: 3px solid var(--mint-dark);
  border-bottom: 1px solid var(--line);
}

.article-aside h2 {
  margin: 0 0 18px;
  font-size: 17px;
}

.article-aside a:not(.download-button) {
  display: block;
  padding: 9px 0;
  color: var(--muted);
  font-size: 14px;
}

.article-aside a:not(.download-button):hover {
  color: var(--mint-dark);
}

.article-aside .download-button {
  width: 100%;
  margin-top: 20px;
}

.check-table {
  width: 100%;
  margin: 24px 0 34px;
  border-collapse: collapse;
  background: var(--white);
}

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

.check-table th {
  background: #eaf3f1;
  font-size: 14px;
}

.related-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 48px;
}

.related-links a {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
}

.related-links strong,
.related-links span {
  display: block;
}

.related-links span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 13px;
}

.site-footer {
  padding: 54px 0 32px;
  color: #a8bbc6;
  background: #04111c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr 0.75fr;
  gap: 60px;
}

.footer-brand {
  color: var(--white);
}

.footer-brand p {
  max-width: 500px;
  margin: 18px 0 0;
  color: #8fa3b0;
  font-size: 14px;
}

.footer-column h2 {
  margin: 0 0 14px;
  color: var(--white);
  font-size: 14px;
}

.footer-column a {
  display: block;
  padding: 5px 0;
  font-size: 14px;
}

.footer-column a:hover {
  color: var(--mint);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  margin-top: 42px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  color: #738997;
  font-size: 12px;
}

.footer-bottom p {
  margin: 0;
}

@media (max-width: 980px) {
  .site-nav {
    gap: 18px;
  }

  .hero-grid {
    grid-template-columns: 1fr 390px;
    gap: 16px;
  }

  .phone-back {
    display: none;
  }

  .phone-main {
    right: 45px;
  }

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

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

  .path-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .screen-stage {
    grid-template-columns: repeat(3, 1fr);
  }

  .screen-item.landscape {
    grid-column: 1 / -1;
    max-width: 560px;
  }

  .article-layout {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .article-aside {
    position: static;
    order: -1;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 28px, var(--container));
  }

  .site-header {
    height: 68px;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    top: 68px;
    right: 0;
    left: 0;
    display: none;
    align-items: stretch;
    flex-direction: column;
    gap: 0;
    max-height: calc(100vh - 68px);
    padding: 18px 20px 28px;
    overflow-y: auto;
    border-top: 1px solid var(--line);
    background: var(--white);
    box-shadow: 0 20px 45px rgba(7, 24, 39, 0.14);
  }

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

  .site-nav a:not(.download-button) {
    padding: 14px 4px;
  }

  .site-nav a:not(.download-button)::after {
    display: none;
  }

  .site-nav .download-button {
    margin-top: 10px;
  }

  .hero,
  .hero-grid {
    min-height: 0;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    padding: 36px 0 0;
  }

  .hero h1 {
    font-size: 44px;
  }

  .hero-copy > p:not(.eyebrow) {
    font-size: 15px;
    line-height: 1.7;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .hero-facts {
    margin-top: 24px;
    padding-top: 18px;
  }

  .hero-visual {
    min-height: 220px;
    margin-top: 8px;
  }

  .phone-frame {
    width: 166px;
    border-radius: 20px;
  }

  .phone-frame img {
    border-radius: 17px;
  }

  .phone-main {
    right: calc(50% - 58px);
  }

  .phone-back {
    display: none;
  }

  .orbit-label {
    right: 2px;
    bottom: 20px;
    width: 126px;
    padding: 12px;
  }

  .section,
  .section.compact {
    padding: 52px 0;
  }

  .section-heading {
    align-items: flex-start;
    flex-direction: column;
    margin-bottom: 30px;
  }

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

  .path-item {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

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

  .screen-stage {
    grid-template-columns: 1fr 1fr;
  }

  .screen-item.landscape {
    grid-column: 1 / -1;
  }

  .screen-item:last-child {
    display: none;
  }

  .feature-row {
    grid-template-columns: 64px 1fr;
    gap: 16px;
  }

  .feature-row p {
    grid-column: 2;
  }

  .deep-links,
  .review-grid,
  .related-links {
    grid-template-columns: 1fr;
  }

  .deep-link {
    min-height: 270px;
    padding: 34px 26px;
  }

  .download-band-inner,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .page-hero {
    padding: 54px 0;
  }

  .page-hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .article-content h2 {
    margin-top: 52px;
    font-size: 27px;
  }

  .step {
    grid-template-columns: 54px 1fr;
    gap: 14px;
  }

  .step::before {
    width: 44px;
    height: 44px;
  }

  .check-table {
    display: block;
    overflow-x: auto;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 38px 24px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) and (max-height: 740px) {
  .hero-grid {
    padding-top: 28px;
  }

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

  .hero-visual {
    min-height: 160px;
  }

  .phone-frame {
    width: 142px;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 39px;
  }

  .hero-facts {
    gap: 16px;
  }

  .hero-facts li {
    min-width: 90px;
  }

  .phone-main {
    right: calc(50% - 85px);
  }

  .phone-back {
    left: calc(50% - 162px);
  }

  .orbit-label {
    font-size: 12px;
  }

  .screen-stage {
    gap: 10px;
  }

  .screen-item img {
    border-width: 4px;
  }

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

  .footer-brand {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}