:root {
  color-scheme: light;
  --background: #f5f9ff;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-solid: #ffffff;
  --surface-blue: #eaf4ff;
  --text: #102a43;
  --muted: #526a82;
  --blue: #075fbe;
  --blue-hover: #064f9b;
  --blue-soft: #d7ebff;
  --border: rgba(16, 42, 67, 0.12);
  --shadow: 0 24px 70px rgba(42, 98, 154, 0.13);
  --shadow-soft: 0 12px 35px rgba(42, 98, 154, 0.09);
  --radius-xl: 32px;
  --radius-lg: 24px;
  --radius-md: 16px;
  --content: 1120px;
  --article: 760px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background:
    radial-gradient(circle at 88% 6%, rgba(93, 176, 255, 0.18), transparent 28rem),
    radial-gradient(circle at 8% 30%, rgba(190, 225, 255, 0.34), transparent 30rem),
    var(--background);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

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

a {
  color: var(--blue);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--blue-hover);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid #005fcc;
  outline-offset: 4px;
  border-radius: 8px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 16px;
  color: #ffffff;
  background: var(--blue);
  border-radius: 12px;
  transform: translateY(-160%);
}

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

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

.site-header {
  position: relative;
  z-index: 20;
  padding: 18px 0;
}

.nav-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  min-height: 54px;
  padding: 8px 10px 8px 14px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 20px;
  box-shadow: 0 10px 35px rgba(31, 93, 151, 0.08);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  backdrop-filter: blur(20px) saturate(140%);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 34px;
  height: 34px;
  place-items: center;
  color: #ffffff;
  background: linear-gradient(145deg, #46bafa, #1769eb);
  border-radius: 10px;
  box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.65), 0 5px 14px rgba(18, 106, 222, 0.25);
  font-size: 18px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 13px;
  color: var(--muted);
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
}

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

main {
  min-height: 65vh;
}

.home-hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  gap: clamp(38px, 7vw, 88px);
  align-items: center;
  min-height: 650px;
  padding: 80px 0 100px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--blue);
  font-size: 14px;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--text);
  line-height: 1.22;
  letter-spacing: -0.02em;
}

.home-hero h1 {
  max-width: 760px;
  margin-bottom: 24px;
  font-size: clamp(2.65rem, 6.6vw, 5.3rem);
  letter-spacing: -0.055em;
}

.hero-copy {
  max-width: 680px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.28rem);
}

.hero-actions,
.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 18px;
  color: #ffffff;
  background: var(--blue);
  border: 1px solid var(--blue);
  border-radius: 14px;
  box-shadow: 0 8px 22px rgba(7, 95, 190, 0.18);
  font-size: 16px;
  font-weight: 680;
  text-decoration: none;
}

.button:hover {
  color: #ffffff;
  background: var(--blue-hover);
  border-color: var(--blue-hover);
}

.button.secondary {
  color: var(--text);
  background: rgba(255, 255, 255, 0.7);
  border-color: var(--border);
  box-shadow: none;
}

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

.trust-line {
  margin: 25px 0 0;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
}

.hero-visual {
  position: relative;
  display: grid;
  min-height: 390px;
  place-items: center;
}

.hero-visual::before {
  position: absolute;
  width: min(380px, 90%);
  aspect-ratio: 1;
  content: "";
  background: radial-gradient(circle, rgba(89, 177, 255, 0.35), rgba(89, 177, 255, 0));
  filter: blur(10px);
}

.icon-stage {
  position: relative;
  width: min(360px, 94%);
  aspect-ratio: 1;
}

.hero-app-icon {
  position: absolute;
  width: 58%;
  height: auto;
  aspect-ratio: 1;
  display: block;
  object-fit: cover;
  border-radius: 23%;
  box-shadow: 0 28px 55px rgba(21, 68, 121, 0.24), inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

.hero-app-icon:first-child {
  top: 4%;
  left: 4%;
  transform: rotate(-5deg);
}

.hero-app-icon:last-child {
  right: 2%;
  bottom: 3%;
  transform: rotate(5deg);
}

.section {
  padding: 88px 0;
}

.section-heading {
  max-width: 700px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin-bottom: 12px;
  font-size: clamp(2rem, 4vw, 3rem);
}

.section-heading p {
  margin: 0;
  color: var(--muted);
}

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

.app-card,
.contact-card,
.summary-card,
.step-card,
.info-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.95);
  box-shadow: var(--shadow-soft);
  -webkit-backdrop-filter: blur(18px) saturate(120%);
  backdrop-filter: blur(18px) saturate(120%);
}

.app-card {
  padding: clamp(24px, 4vw, 36px);
  border-radius: var(--radius-xl);
}

.app-card-header {
  display: flex;
  gap: 20px;
  align-items: center;
}

.app-icon {
  width: 82px;
  height: 82px;
  flex: 0 0 auto;
  border-radius: 22%;
  box-shadow: 0 13px 28px rgba(25, 69, 113, 0.18);
}

.platform-pill,
.status-pill {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 3px 10px;
  color: var(--blue);
  background: var(--surface-blue);
  border: 1px solid rgba(7, 95, 190, 0.1);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
}

.app-card h3 {
  margin: 8px 0 0;
  font-size: 1.8rem;
}

.tagline {
  margin: 26px 0 8px;
  color: var(--text);
  font-size: 1.15rem;
  font-weight: 700;
}

.app-card > p:not(.tagline) {
  color: var(--muted);
}

.feature-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0;
  margin: 22px 0 0;
  list-style: none;
}

.feature-list li {
  padding: 6px 10px;
  color: var(--muted);
  background: rgba(234, 244, 255, 0.76);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 650;
}

.card-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 2px;
  font-weight: 700;
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 28px;
  align-items: center;
  padding: clamp(28px, 5vw, 50px);
  border-radius: var(--radius-xl);
}

.contact-card h2,
.contact-card h3 {
  margin-bottom: 10px;
}

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

.site-footer {
  padding: 44px 0 52px;
  color: var(--muted);
  font-size: 14px;
}

.footer-shell {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
}

.footer-shell p {
  margin: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 34px 0 0;
  color: var(--muted);
  font-size: 14px;
}

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

.page-hero {
  padding: 62px 0 44px;
}

.page-hero h1 {
  max-width: 880px;
  margin-bottom: 18px;
  font-size: clamp(2.5rem, 6vw, 4.6rem);
}

.page-hero .lead {
  max-width: 820px;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.28rem);
}

.policy-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin-top: 22px;
  color: var(--muted);
  font-size: 14px;
}

.summary-card {
  max-width: 920px;
  padding: clamp(24px, 4vw, 36px);
  margin-bottom: 42px;
  background: linear-gradient(145deg, rgba(234, 244, 255, 0.94), rgba(255, 255, 255, 0.92));
  border-radius: var(--radius-lg);
}

.summary-card p {
  margin: 0;
  color: #24435f;
  font-size: 1.04rem;
}

.highlights {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  padding: 0;
  margin: 20px 0 0;
  list-style: none;
}

.highlights li {
  position: relative;
  padding-left: 25px;
  color: #24435f;
  font-weight: 650;
}

.highlights li::before {
  position: absolute;
  top: 0.5em;
  left: 2px;
  width: 9px;
  height: 9px;
  content: "";
  background: #31a0ec;
  border-radius: 50%;
  box-shadow: 0 0 0 5px rgba(49, 160, 236, 0.13);
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, var(--article)) minmax(200px, 1fr);
  gap: 72px;
  align-items: start;
  padding-bottom: 70px;
}

.article-body {
  max-width: var(--article);
  min-width: 0;
}

.article-body section {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

.article-body section:first-child {
  padding-top: 0;
  border-top: 0;
}

.article-body h2 {
  margin-bottom: 14px;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  scroll-margin-top: 24px;
}

.article-body h3 {
  margin-top: 26px;
  margin-bottom: 8px;
  font-size: 1.15rem;
}

.article-body p,
.article-body ul,
.article-body ol {
  margin-top: 0;
  margin-bottom: 17px;
}

.article-body li + li {
  margin-top: 7px;
}

.toc {
  position: sticky;
  top: 24px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(255, 255, 255, 0.92);
  border-radius: 20px;
  box-shadow: var(--shadow-soft);
}

.toc strong {
  display: block;
  margin-bottom: 10px;
}

.toc ol {
  padding-left: 20px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.toc li + li {
  margin-top: 6px;
}

.toc a {
  color: var(--muted);
}

.notice {
  padding: 16px 18px;
  margin: 22px 0;
  color: #24435f;
  background: var(--surface-blue);
  border-left: 4px solid #4aa8ee;
  border-radius: 4px 14px 14px 4px;
}

.steps-section {
  padding: 10px 0 70px;
}

.step-grid {
  counter-reset: steps;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.step-card {
  position: relative;
  min-height: 190px;
  padding: 26px;
  border-radius: var(--radius-lg);
  counter-increment: steps;
}

.step-card::before {
  display: grid;
  width: 38px;
  height: 38px;
  margin-bottom: 20px;
  place-items: center;
  color: var(--blue);
  background: var(--surface-blue);
  border-radius: 12px;
  content: counter(steps);
  font-weight: 800;
}

.step-card h2,
.step-card h3 {
  margin-bottom: 10px;
  font-size: 1.12rem;
}

.step-card p {
  margin: 0;
  color: var(--muted);
  font-size: 15px;
}

.faq-section {
  max-width: 860px;
  padding-bottom: 80px;
}

.faq-section h2 {
  margin-bottom: 24px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

details {
  margin-bottom: 12px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(255, 255, 255, 0.95);
  border-radius: 18px;
  box-shadow: 0 7px 22px rgba(42, 98, 154, 0.06);
}

summary {
  position: relative;
  min-height: 56px;
  padding: 16px 52px 16px 20px;
  cursor: pointer;
  font-weight: 720;
  list-style: none;
}

summary::-webkit-details-marker {
  display: none;
}

summary::after {
  position: absolute;
  top: 50%;
  right: 20px;
  width: 10px;
  height: 10px;
  content: "";
  border-right: 2px solid var(--muted);
  border-bottom: 2px solid var(--muted);
  transform: translateY(-68%) rotate(45deg);
}

details[open] summary::after {
  transform: translateY(-25%) rotate(225deg);
}

.details-body {
  padding: 0 20px 20px;
  color: var(--muted);
}

.details-body p:last-child,
.details-body ul:last-child,
.details-body ol:last-child {
  margin-bottom: 0;
}

.error-page {
  display: grid;
  min-height: 65vh;
  place-items: center;
  text-align: center;
}

.error-page h1 {
  margin-bottom: 10px;
  font-size: clamp(4rem, 15vw, 8rem);
}

.error-page p {
  margin-top: 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .home-hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-top: 54px;
  }

  .hero-visual {
    min-height: 330px;
  }

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

  .toc {
    position: static;
    order: -1;
    max-width: var(--article);
  }

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

@media (max-width: 700px) {
  .container {
    width: min(calc(100% - 32px), var(--content));
  }

  .site-header {
    padding-top: 10px;
  }

  .nav-shell {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .home-hero {
    padding-bottom: 64px;
  }

  .app-grid,
  .feature-grid,
  .highlights {
    grid-template-columns: 1fr;
  }

  .contact-card {
    grid-template-columns: 1fr;
  }

  .app-card-header {
    align-items: flex-start;
  }

  .page-hero {
    padding-top: 42px;
  }
}

@media (max-width: 520px) {
  .hero-actions .button,
  .contact-card .button {
    width: 100%;
  }

  .hero-visual {
    min-height: 280px;
  }

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

  .app-icon {
    width: 68px;
    height: 68px;
  }

  .app-card h3 {
    font-size: 1.55rem;
  }
}

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

@media print {
  body {
    color: #000000;
    background: #ffffff;
    font-size: 11pt;
  }

  .site-header,
  .site-footer,
  .toc,
  .button,
  .breadcrumb {
    display: none !important;
  }

  .container,
  .article-body {
    width: 100%;
    max-width: none;
  }

  .page-hero {
    padding-top: 0;
  }

  .article-layout {
    display: block;
  }

  .article-body section {
    break-inside: avoid;
  }

  a {
    color: #000000;
  }
}