:root {
  --bg: #f7f9fc;
  --card: #ffffff;
  --ink: #172033;
  --muted: #667085;
  --line: #e5eaf2;
  --brand: #1f7aec;
  --brand-dark: #155bd4;
  --green: #0f9f8f;
  --orange: #d97706;
  --shadow: 0 12px 30px rgba(31, 42, 68, 0.07);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 18% 0, rgba(31, 122, 236, 0.14), transparent 260px),
    linear-gradient(180deg, #f8fbff 0, var(--bg) 330px);
}

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

.page {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 22px 0 56px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 850;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--green));
  box-shadow: 0 10px 24px rgba(31, 122, 236, 0.22);
}

.brand-mark svg { width: 21px; height: 21px; }

.actions {
  display: flex;
  gap: 10px;
}

.btn,
.inline-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  font-size: 14px;
  font-weight: 760;
  transition: 0.18s ease;
}

.btn:hover,
.inline-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(31, 122, 236, 0.35);
  box-shadow: 0 8px 20px rgba(31, 122, 236, 0.12);
}

.btn.primary,
.inline-btn {
  border-color: var(--brand);
  background: var(--brand);
  color: #fff;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 34px 36px;
  border: 1px solid rgba(31, 122, 236, 0.12);
  border-radius: 16px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(240, 247, 255, 0.96)), var(--card);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  right: -36px;
  top: -44px;
  width: 210px;
  height: 210px;
  border-radius: 999px;
  background: rgba(31, 122, 236, 0.08);
}

.eyebrow {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 820;
}

.eyebrow::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--brand);
  box-shadow: 0 0 0 5px rgba(31, 122, 236, 0.12);
}

h1,
h2,
h3 { letter-spacing: 0; }

h1 {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0;
  font-size: clamp(28px, 4vw, 40px);
  line-height: 1.18;
}

.hero p,
.article-hero p,
.section-head p,
.faq-card p,
.guide-card p,
.guide-step p,
.brief-item span {
  color: var(--muted);
  line-height: 1.78;
}

.hero p {
  position: relative;
  z-index: 1;
  max-width: 790px;
  margin: 12px 0 0;
  font-size: 15px;
}

.brief-list {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.brief-item,
.section,
.guide-card,
.faq-card,
.contact-band,
.article-hero,
.guide-step,
.notice {
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--card);
}

.brief-item {
  padding: 14px 15px;
  box-shadow: none;
}

.brief-item strong {
  display: block;
  margin-bottom: 5px;
  font-size: 14px;
}

.brief-item span {
  font-size: 13px;
  line-height: 1.58;
}

.section {
  margin-top: 18px;
  padding: 24px;
  box-shadow: var(--shadow);
}

.section-head { margin-bottom: 16px; }

.section h2 {
  margin: 0;
  font-size: 21px;
}

.section-head p {
  max-width: 720px;
  margin: 7px 0 0;
  font-size: 14px;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.guide-card {
  display: grid;
  min-height: 174px;
  padding: 16px;
  box-shadow: none;
  transition: 0.18s ease;
}

.guide-card:hover {
  transform: translateY(-2px);
  border-color: rgba(31, 122, 236, 0.3);
  box-shadow: 0 16px 34px rgba(31, 42, 68, 0.09);
}

.guide-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  color: var(--brand);
  background: #edf5ff;
}

.guide-icon svg {
  width: 21px;
  height: 21px;
}

.guide-card h3 {
  margin: 14px 0 7px;
  font-size: 17px;
}

.guide-card p {
  margin: 0;
  font-size: 13px;
}

.guide-card span:last-child {
  align-self: end;
  margin-top: 14px;
  color: var(--brand-dark);
  font-size: 13px;
  font-weight: 820;
}

.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.faq-card {
  padding: 17px;
  box-shadow: none;
}

.faq-card h3 {
  margin: 0 0 7px;
  font-size: 16px;
}

.faq-card p {
  margin: 0;
  font-size: 14px;
}

.contact-band {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 18px;
  padding: 18px 20px;
  background: linear-gradient(135deg, #ffffff, #eef6ff);
  box-shadow: var(--shadow);
}

.contact-band strong {
  display: block;
  margin-bottom: 5px;
  font-size: 16px;
}

.contact-band p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.article-wrap {
  max-width: 880px;
  margin: 0 auto;
}

.article-hero {
  padding: 30px 32px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
  background: linear-gradient(135deg, #ffffff, #f1f7ff);
}

.article-hero h1 {
  font-size: clamp(26px, 3.4vw, 38px);
}

.article-hero p {
  max-width: 760px;
  margin: 12px 0 0;
  font-size: 15px;
}

.notice {
  margin-bottom: 14px;
  padding: 13px 14px;
  border-color: #f8dd9a;
  background: #fff9eb;
  color: #7c4a03;
  font-size: 14px;
  line-height: 1.75;
}

.guide-steps {
  display: grid;
  gap: 12px;
}

.guide-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}

.step-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  background: #edf5ff;
  color: var(--brand);
  font-size: 13px;
  font-weight: 900;
}

.step-body h2 {
  margin: 2px 0 8px;
  font-size: 18px;
  line-height: 1.35;
}

.step-body h2:not(:first-child) {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.step-body p {
  margin: 0;
  font-size: 14px;
}

.inline-btn {
  min-height: 30px;
  margin: 0 4px;
  padding: 0 10px;
  vertical-align: baseline;
  font-size: 13px;
}

.action-line,
.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 12px;
}

.download-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 14px;
}

.download-box {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
}

.download-box h3 {
  margin: 0 0 10px;
  font-size: 14px;
}

.checklist {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f8fbff;
}

.check {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.check svg { display: none; }

.check::before {
  content: "";
  display: inline-block;
  width: 7px;
  height: 7px;
  margin-right: 8px;
  border-radius: 99px;
  background: var(--brand);
  vertical-align: 1px;
}

.image-frame {
  margin-top: 14px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #eef2f7;
}

.image-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.apple-frame {
  display: block;
  width: 100%;
  min-height: 520px;
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #fff;
}

@media (max-width: 920px) {
  .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .brief-list,
  .faq-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .page {
    width: min(100% - 24px, 1120px);
    padding-top: 14px;
  }

  .topbar,
  .contact-band {
    align-items: flex-start;
    flex-direction: column;
  }

  .actions {
    width: 100%;
  }

  .actions .btn,
  .contact-band .btn {
    flex: 1;
    width: 100%;
  }

  .hero,
  .section,
  .article-hero,
  .guide-step {
    padding: 16px;
  }

  .guide-grid,
  .download-grid {
    grid-template-columns: 1fr;
  }

  .guide-step {
    grid-template-columns: 34px minmax(0, 1fr);
    gap: 10px;
  }
}