:root {
  color-scheme: light;
  --bg: #f5f7fa;
  --surface: #ffffff;
  --surface-soft: #eef3f0;
  --ink: #17202a;
  --muted: #5e6b76;
  --line: #dbe3ea;
  --line-strong: #c5d1dc;
  --brand: #ffbf1b;
  --brand-dark: #9d5a00;
  --green: #1c7c59;
  --blue: #2563a9;
  --coral: #e66f51;
  --header: #171a1f;
  --header-muted: #c8d0d8;
  --shadow: 0 18px 44px rgba(23, 32, 42, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  line-height: 1.72;
}

img {
  max-width: 100%;
}

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

a:hover {
  color: #174a82;
}

.site-header,
.doc-header {
  background: var(--header);
  color: #ffffff;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav,
.doc-nav {
  max-width: 1160px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 40px;
  color: #ffffff;
  font-weight: 800;
  text-decoration: none;
}

.brand img {
  width: 32px;
  height: 32px;
}

.nav-links,
.doc-nav {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.nav a,
.doc-nav a {
  color: var(--header-muted);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links a,
.doc-nav a {
  min-height: 36px;
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 8px;
}

.nav-links a:hover,
.doc-nav a:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  max-width: 1160px;
  margin: 0 auto;
  padding: 70px 24px 78px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(360px, 520px);
  gap: 48px;
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.eyebrow,
.kicker {
  margin: 0 0 10px;
  color: var(--brand);
  font-weight: 800;
  text-transform: uppercase;
  font-size: 13px;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  max-width: 780px;
  margin-bottom: 18px;
  font-size: 64px;
  line-height: 1.04;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  color: var(--header-muted);
  font-size: 20px;
}

.actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  color: var(--ink);
  background: var(--surface);
  text-decoration: none;
  font-weight: 800;
}

.button:hover {
  color: var(--ink);
  border-color: var(--ink);
}

.button.primary {
  border-color: var(--brand);
  background: var(--brand);
  color: #141414;
}

.button.ghost {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.24);
  background: rgba(255, 255, 255, 0.08);
}

.button.ghost:hover {
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.48);
}

.quick-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 34px 0 0;
}

.quick-facts div {
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.quick-facts dt {
  color: #ffffff;
  font-size: 26px;
  font-weight: 900;
  line-height: 1;
}

.quick-facts dd {
  margin: 6px 0 0;
  color: var(--header-muted);
  font-size: 13px;
}

figure,
.note,
.links-panel {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

figure {
  overflow: hidden;
}

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

.hero-visual {
  border-color: rgba(255, 255, 255, 0.16);
  background: #ffffff;
}

figcaption {
  padding: 12px 14px;
  color: var(--muted);
  font-size: 14px;
}

main {
  max-width: 1160px;
  margin: 0 auto;
  padding: 30px 24px 70px;
}

.section {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 440px);
  gap: 38px;
  align-items: center;
  padding: 58px 0;
  border-bottom: 1px solid var(--line);
}

.section.alt {
  grid-template-columns: minmax(280px, 440px) minmax(0, 1fr);
}

.section.alt .section-copy {
  order: 2;
}

h2 {
  margin-bottom: 14px;
  font-size: 38px;
  line-height: 1.16;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 8px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0;
}

.section-copy p,
.section-copy li,
.doc-main p,
.doc-main li {
  color: var(--muted);
}

.section-copy h2,
.doc-main h2,
.doc-main h3 {
  color: var(--ink);
}

.note,
.links-panel {
  padding: 24px;
}

.note {
  border-left: 4px solid var(--coral);
}

.note strong {
  display: block;
  margin-bottom: 8px;
  color: var(--brand-dark);
  font-size: 18px;
}

.links-panel {
  display: grid;
  gap: 10px;
}

.links-panel h3 {
  margin-bottom: 4px;
}

.checklist {
  padding-left: 20px;
}

.doc-header .doc-nav {
  justify-content: flex-start;
}

.doc-title {
  max-width: 1040px;
  margin: 0 auto;
  padding: 48px 24px 58px;
}

.doc-title h1 {
  max-width: 760px;
  font-size: 54px;
}

.doc-main {
  max-width: 1040px;
}

.doc-main article:not(.activation-guide) {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
  padding: 34px;
}

.doc-main h2 {
  margin-top: 34px;
  font-size: 32px;
}

.doc-main h2:first-child {
  margin-top: 0;
}

.doc-main img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 18px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.doc-main table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 15px;
}

.doc-main th,
.doc-main td {
  padding: 10px 12px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.doc-main th {
  background: var(--surface-soft);
}

.doc-main code {
  padding: 2px 5px;
  border-radius: 4px;
  background: #eef2f0;
  color: #25313a;
}

.activation-guide {
  display: grid;
  gap: 24px;
}

.doc-intro,
.notice-band,
.support-grid > div {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.doc-intro {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 380px);
  gap: 28px;
  padding: 28px;
}

.doc-intro h2,
.support-grid h2 {
  margin-top: 0;
}

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

.prep-list li {
  position: relative;
  padding-left: 22px;
}

.prep-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
}

.notice-band {
  padding: 20px 24px;
  border-left: 4px solid var(--brand);
}

.notice-band strong {
  display: block;
  margin-bottom: 6px;
  color: var(--brand-dark);
}

.notice-band p {
  margin-bottom: 0;
}

.activation-steps {
  display: grid;
  gap: 22px;
}

.step-card {
  display: grid;
  grid-template-columns: minmax(260px, 0.78fr) minmax(0, 1.22fr);
  gap: 24px;
  align-items: center;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.step-copy {
  min-width: 0;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 32px;
  margin-bottom: 16px;
  border-radius: 8px;
  background: #17202a;
  color: var(--brand);
  font-weight: 900;
  line-height: 1;
}

.step-card h2 {
  margin-top: 0;
  font-size: 30px;
}

.step-shot {
  box-shadow: none;
}

.step-shot img {
  margin: 0;
  border: 0;
}

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.support-grid > div {
  padding: 26px;
}

.next-links {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 4px;
}

footer {
  padding: 28px 24px 40px;
  color: var(--muted);
  text-align: center;
  border-top: 1px solid var(--line);
}

@media (max-width: 960px) {
  h1 {
    font-size: 48px;
  }

  h2 {
    font-size: 32px;
  }

  .hero,
  .section,
  .section.alt,
  .doc-intro,
  .step-card,
  .support-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-top: 48px;
    padding-bottom: 56px;
  }

  .section.alt .section-copy {
    order: 0;
  }

  .step-card {
    padding: 20px;
  }
}

@media (max-width: 640px) {
  .nav,
  .doc-nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .nav-links,
  .doc-nav {
    gap: 6px;
  }

  h1,
  .doc-title h1 {
    font-size: 40px;
  }

  .lead {
    font-size: 18px;
  }

  .quick-facts {
    grid-template-columns: 1fr;
  }

  main {
    padding-left: 18px;
    padding-right: 18px;
  }

  .doc-main article:not(.activation-guide),
  .doc-intro,
  .support-grid > div {
    padding: 22px 18px;
  }

  .step-card {
    padding: 16px;
  }
}