:root {
  --ink: #183153;
  --muted: #5e7188;
  --line: #dbe5ee;
  --paper: #ffffff;
  --mist: #f5f8fb;
  --sky: #2f80ed;
  --sky-dark: #1e64bd;
  --leaf: #35b97f;
  --leaf-dark: #177b54;
  --coral: #ff6b5f;
  --sun: #f5c451;
  --violet: #7b61a8;
  --shadow: 0 14px 38px rgba(24, 49, 83, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  font-size: 16px;
  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: 10px;
  left: 10px;
  z-index: 100;
  padding: 8px 12px;
  color: #ffffff;
  background: var(--ink);
  transform: translateY(-160%);
}

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

.container {
  width: min(1160px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(219, 229, 238, 0.86);
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
}

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

.brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  gap: 10px;
  font-size: 20px;
  font-weight: 800;
}

.brand img {
  width: 42px;
  height: 42px;
}

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

.site-nav a:not(.button) {
  color: #41566d;
  font-size: 15px;
  font-weight: 700;
}

.site-nav a[aria-current="page"],
.site-nav a:not(.button):hover {
  color: var(--sky-dark);
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #ffffff;
  color: var(--ink);
  font-size: 23px;
  cursor: pointer;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 10px 24px;
  border: 1px solid var(--sky);
  border-radius: 6px;
  color: #ffffff;
  background: var(--sky);
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(47, 128, 237, 0.2);
  transition: transform 180ms ease, background 180ms ease, box-shadow 180ms ease;
}

.button:hover {
  background: var(--sky-dark);
  box-shadow: 0 10px 24px rgba(47, 128, 237, 0.28);
  transform: translateY(-2px);
}

.button.secondary {
  border-color: var(--ink);
  color: var(--ink);
  background: transparent;
  box-shadow: none;
}

.button.secondary:hover {
  color: #ffffff;
  background: var(--ink);
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  background: linear-gradient(125deg, #eef7ff 0%, #ffffff 50%, #ecfaf3 100%);
}

.hero::before {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(47, 128, 237, 0.06) 1px, transparent 1px), linear-gradient(90deg, rgba(47, 128, 237, 0.06) 1px, transparent 1px);
  background-size: 38px 38px;
  content: "";
}

.hero-grid {
  position: relative;
  display: grid;
  min-height: 650px;
  align-items: center;
  grid-template-columns: 1.02fr 0.98fr;
  gap: 56px;
  padding: 70px 0 78px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--leaf-dark);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0;
}

.eyebrow::before {
  width: 28px;
  height: 3px;
  background: var(--leaf);
  content: "";
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.22;
  letter-spacing: 0;
}

h1 {
  max-width: 620px;
  margin-bottom: 20px;
  font-size: clamp(40px, 6vw, 68px);
}

.hero-copy > p {
  max-width: 620px;
  margin: 0 0 28px;
  color: var(--muted);
  font-size: 19px;
}

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

.hero-notes {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin: 24px 0 0;
  padding: 0;
  color: #53687e;
  font-size: 14px;
  list-style: none;
}

.hero-notes li::before {
  margin-right: 7px;
  color: var(--leaf);
  content: "\2713";
  font-weight: 900;
}

.hero-visual {
  position: relative;
  min-height: 520px;
}

.phone {
  position: absolute;
  overflow: hidden;
  width: min(260px, 52%);
  border: 8px solid #13233a;
  border-radius: 34px;
  background: #13233a;
  box-shadow: var(--shadow);
}

.phone img {
  width: 100%;
  border-radius: 24px;
}

.phone.primary {
  top: 0;
  right: 13%;
  z-index: 2;
}

.phone.secondary-phone {
  top: 110px;
  left: 4%;
  z-index: 1;
  width: min(218px, 44%);
  transform: rotate(-5deg);
}

.feature-strip {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink);
}

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

.feature-strip-item {
  min-height: 108px;
  padding: 25px 24px;
  border-right: 1px solid rgba(255, 255, 255, 0.14);
  color: #ffffff;
}

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

.feature-strip-item strong,
.feature-strip-item span {
  display: block;
}

.feature-strip-item strong {
  font-size: 21px;
}

.feature-strip-item span {
  color: #b9c8d8;
  font-size: 14px;
}

.section {
  padding: 92px 0;
}

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

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 38px;
}

.section-heading h2 {
  max-width: 680px;
  margin-bottom: 0;
  font-size: clamp(30px, 4vw, 44px);
}

.section-heading span {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

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

.feature-card {
  padding: 28px;
  border: 1px solid var(--line);
  border-top: 4px solid var(--sky);
  border-radius: 8px;
  background: #ffffff;
}

.feature-card:nth-child(2) {
  border-top-color: var(--leaf);
}

.feature-card:nth-child(3) {
  border-top-color: var(--coral);
}

.feature-card:nth-child(4) {
  border-top-color: var(--sun);
}

.feature-card:nth-child(5) {
  border-top-color: var(--violet);
}

.feature-card:nth-child(6) {
  border-top-color: #368b91;
}

.feature-card .number {
  display: block;
  margin-bottom: 30px;
  color: #a0afbd;
  font-size: 13px;
  font-weight: 800;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 22px;
}

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

.showcase-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
}

.showcase-item {
  margin: 0;
  text-align: center;
}

.showcase-item img {
  width: 100%;
  max-width: 350px;
  height: auto;
  margin: 0 auto 20px;
  border: 7px solid #13233a;
  border-radius: 34px;
  box-shadow: var(--shadow);
}

.showcase-item figcaption {
  color: var(--muted);
  font-size: 15px;
}

.showcase-item strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-size: 19px;
}

.pathways {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.pathway {
  position: relative;
  min-height: 280px;
  padding: 36px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

.pathway:first-child {
  background: #eaf3ff;
}

.pathway:last-child {
  background: #eaf8f1;
}

.pathway .tag {
  display: inline-block;
  margin-bottom: 52px;
  color: var(--sky-dark);
  font-size: 13px;
  font-weight: 800;
}

.pathway:last-child .tag {
  color: var(--leaf-dark);
}

.pathway h3 {
  max-width: 380px;
  margin-bottom: 12px;
  font-size: 30px;
}

.pathway p {
  max-width: 430px;
  margin: 0 0 20px;
  color: var(--muted);
}

.text-link {
  color: var(--sky-dark);
  font-weight: 800;
}

.text-link::after {
  margin-left: 6px;
  content: "\2192";
}

.trust-layout {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
}

.trust-copy h2 {
  margin-bottom: 18px;
  font-size: 40px;
}

.trust-copy p {
  color: var(--muted);
}

.rating {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-top: 28px;
}

.rating strong {
  font-size: 50px;
}

.rating span {
  color: #84620c;
  font-weight: 800;
}

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

.review {
  margin: 0;
  padding: 22px 0 22px 26px;
  border-left: 4px solid var(--sky);
  background: #ffffff;
}

.review:nth-child(2) {
  border-left-color: var(--leaf);
}

.review:nth-child(3) {
  border-left-color: var(--coral);
}

.review p {
  margin: 0 0 10px;
  color: #41566d;
}

.review cite {
  color: var(--muted);
  font-size: 14px;
  font-style: normal;
}

.faq-preview {
  display: grid;
  gap: 1px;
  border-top: 1px solid var(--line);
}

.faq-preview article {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 20px;
  padding: 25px 0;
  border-bottom: 1px solid var(--line);
}

.faq-preview strong {
  color: var(--sky);
  font-size: 15px;
}

.faq-preview h3 {
  margin-bottom: 6px;
  font-size: 20px;
}

.faq-preview p {
  margin: 0;
  color: var(--muted);
}

.download-band {
  color: #ffffff;
  background: var(--ink);
}

.download-band-inner {
  display: flex;
  min-height: 220px;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.download-band h2 {
  margin-bottom: 8px;
  font-size: 36px;
}

.download-band p {
  margin: 0;
  color: #b9c8d8;
}

.site-footer {
  padding: 54px 0 28px;
  color: #aab8c7;
  background: #101d2e;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr;
  gap: 48px;
  padding-bottom: 40px;
}

.footer-brand {
  color: #ffffff;
}

.footer-brand p {
  max-width: 480px;
  color: #aab8c7;
}

.footer-links strong {
  display: block;
  margin-bottom: 12px;
  color: #ffffff;
}

.footer-links a {
  display: block;
  margin: 6px 0;
}

.footer-links a:hover {
  color: #ffffff;
}

.footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 13px;
}

.footer-bottom p {
  margin: 5px 0;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 84px 0 72px;
  border-bottom: 1px solid var(--line);
  background: #eef7ff;
}

.page-hero.green {
  background: #eaf8f1;
}

.page-hero h1 {
  max-width: 860px;
  font-size: clamp(38px, 6vw, 62px);
}

.page-hero p {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 18px;
}

.breadcrumb {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 14px;
}

.breadcrumb a {
  color: var(--sky-dark);
}

.guide-layout {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 60px;
}

.side-index {
  position: sticky;
  top: 102px;
  align-self: start;
  padding: 22px;
  border-left: 4px solid var(--sky);
  background: var(--mist);
}

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

.side-index a {
  display: block;
  padding: 6px 0;
  color: var(--muted);
  font-size: 14px;
}

.side-index a:hover {
  color: var(--sky-dark);
}

.article-flow section {
  padding: 0 0 56px;
  scroll-margin-top: 100px;
}

.article-flow h2 {
  margin-bottom: 22px;
  font-size: 34px;
}

.article-flow h3 {
  margin: 25px 0 10px;
  font-size: 22px;
}

.article-flow p,
.article-flow li {
  color: #41566d;
}

.article-flow a {
  color: var(--sky-dark);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.steps {
  display: grid;
  gap: 22px;
  counter-reset: guide-step;
}

.step {
  position: relative;
  padding: 28px 30px 28px 86px;
  border: 1px solid var(--line);
  border-radius: 8px;
  counter-increment: guide-step;
}

.step::before {
  position: absolute;
  top: 27px;
  left: 28px;
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border-radius: 50%;
  color: #ffffff;
  background: var(--sky);
  content: counter(guide-step);
  font-weight: 800;
}

.step h3 {
  margin-top: 0;
}

.step p:last-child {
  margin-bottom: 0;
}

.check-list,
.plain-list {
  margin: 16px 0;
  padding-left: 22px;
}

.check-list li,
.plain-list li {
  margin: 8px 0;
}

.notice {
  padding: 20px 22px;
  border-left: 4px solid var(--sun);
  background: #fff9e7;
  color: #675321;
}

.mini-shot {
  width: min(100%, 300px);
  max-width: 300px;
  height: auto;
  margin: 24px auto;
  border: 6px solid #13233a;
  border-radius: 30px;
  box-shadow: var(--shadow);
}

.function-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}

.function-block {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.function-block h3 {
  margin: 0 0 10px;
}

.function-block p {
  margin: 0;
}

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

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

.accordion-button {
  display: grid;
  width: 100%;
  grid-template-columns: 38px 1fr 28px;
  align-items: center;
  gap: 12px;
  padding: 23px 0;
  border: 0;
  color: var(--ink);
  background: transparent;
  font: inherit;
  font-weight: 800;
  text-align: left;
  cursor: pointer;
}

.accordion-button .question-number {
  color: var(--sky);
  font-size: 13px;
}

.accordion-button .plus {
  color: var(--sky-dark);
  font-size: 24px;
  text-align: center;
  transition: transform 180ms ease;
}

.accordion-button[aria-expanded="true"] .plus {
  transform: rotate(45deg);
}

.accordion-panel {
  padding: 0 40px 22px 50px;
  color: #41566d;
}

.accordion-panel p {
  margin: 0 0 12px;
}

.related-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
}

.related-link {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #ffffff;
}

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

.related-link span {
  margin-top: 6px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 900px) {
  .site-nav {
    position: fixed;
    inset: 73px 0 auto 0;
    display: none;
    align-items: stretch;
    padding: 22px 20px 28px;
    border-bottom: 1px solid var(--line);
    background: #ffffff;
    box-shadow: var(--shadow);
    flex-direction: column;
  }

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

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

  .hero-grid,
  .trust-layout,
  .guide-layout {
    grid-template-columns: 1fr;
  }

  .hero-grid {
    padding-top: 60px;
  }

  .hero-visual {
    min-height: 500px;
  }

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

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

  .feature-strip-item:nth-child(-n + 2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

  .showcase-grid {
    gap: 16px;
  }

  .side-index {
    position: static;
  }
}

@media (max-width: 680px) {
  .container {
    width: calc(100% - 28px);
    max-width: 1160px;
  }

  .nav-shell {
    min-height: 64px;
  }

  .site-nav {
    top: 65px;
  }

  .site-nav .button {
    width: 100%;
  }

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

  .hero-grid {
    gap: 30px;
    padding: 42px 0 52px;
  }

  h1 {
    font-size: 40px;
  }

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

  .hero-actions .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 430px;
  }

  .phone.primary {
    right: 8%;
  }

  .phone.secondary-phone {
    left: 2%;
  }

  .section {
    padding: 68px 0;
  }

  .section-heading {
    align-items: start;
    flex-direction: column;
  }

  .feature-strip-grid,
  .feature-grid,
  .showcase-grid,
  .pathways,
  .function-grid,
  .related-links,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .feature-strip-item {
    border-right: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  }

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

  .showcase-grid {
    gap: 50px;
  }

  .showcase-item img {
    max-width: 300px;
  }

  .pathway {
    min-height: 0;
    padding: 28px;
  }

  .pathway .tag {
    margin-bottom: 28px;
  }

  .download-band-inner {
    align-items: start;
    padding: 42px 0;
    flex-direction: column;
  }

  .download-band .button {
    width: 100%;
  }

  .page-hero {
    padding: 58px 0 52px;
  }

  .page-hero h1 {
    font-size: 40px;
  }

  .step {
    padding: 76px 22px 24px;
  }

  .step::before {
    top: 22px;
    left: 22px;
  }

  .accordion-button {
    grid-template-columns: 32px 1fr 24px;
  }

  .accordion-panel {
    padding-left: 44px;
    padding-right: 8px;
  }
}

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