/* ===== 第1套 · 官方商务蓝 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --blue: #1a5cff;
  --blue-dark: #0e3fc0;
  --blue-light: #eaf1ff;
  --ink: #1c2333;
  --muted: #5a6478;
  --line: #e3e8f2;
  --bg-soft: #f6f8fc;
}
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  line-height: 1.75;
  background: #fff;
  font-size: 16px;
}
a { color: var(--blue); text-decoration: none; }
a:hover { text-decoration: underline; }
img, svg { vertical-align: middle; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* 页头 */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.96);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-badge {
  width: 34px; height: 34px; border-radius: 9px;
  background: linear-gradient(135deg, var(--blue), #4d8bff);
  display: flex; align-items: center; justify-content: center; color: #fff;
  font-size: 18px; font-weight: 800;
}
.main-nav { display: flex; gap: 6px; }
.main-nav a {
  padding: 8px 16px; border-radius: 8px; color: var(--ink);
  font-size: 15px; font-weight: 500;
}
.main-nav a:hover { background: var(--blue-light); text-decoration: none; }
.main-nav a.is-active { background: var(--blue); color: #fff; }

/* Hero */
.hero {
  background: linear-gradient(120deg, #0e3fc0 0%, #1a5cff 55%, #4d8bff 100%);
  color: #fff; padding: 88px 0 96px;
}
.hero h1 { font-size: 40px; line-height: 1.3; margin-bottom: 18px; letter-spacing: .5px; }
.hero p.lead { font-size: 18px; max-width: 720px; opacity: .94; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 30px; border-radius: 10px; font-size: 16px; font-weight: 600;
  border: none; cursor: pointer; transition: transform .15s ease, box-shadow .15s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn-primary { background: #fff; color: var(--blue-dark); box-shadow: 0 8px 24px rgba(0,0,0,.18); }
.btn-ghost { background: rgba(255,255,255,.14); color: #fff; border: 1px solid rgba(255,255,255,.5); }
.btn-blue { background: var(--blue); color: #fff; box-shadow: 0 6px 18px rgba(26,92,255,.35); }
.btn.is-loading { opacity: .75; cursor: wait; }
.hero-stats { display: flex; gap: 48px; margin-top: 48px; flex-wrap: wrap; }
.hero-stats .num { font-size: 30px; font-weight: 800; }
.hero-stats .lbl { font-size: 14px; opacity: .85; }

/* 区块 */
.section { padding: 72px 0; }
.section.alt { background: var(--bg-soft); }
.section-title { font-size: 30px; margin-bottom: 14px; }
.section-sub { color: var(--muted); max-width: 760px; margin-bottom: 40px; font-size: 16px; }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: 14px;
  padding: 28px; transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: 0 12px 30px rgba(20,40,90,.09); transform: translateY(-3px); }
.card .icn {
  width: 46px; height: 46px; border-radius: 11px; background: var(--blue-light);
  display: flex; align-items: center; justify-content: center; margin-bottom: 16px; color: var(--blue);
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 15px; }

/* 平台下载条 */
.platform-row { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.platform {
  text-align: center; padding: 30px 18px; background: #fff;
  border: 1px solid var(--line); border-radius: 14px;
}
.platform .icn { margin: 0 auto 14px; width: 52px; height: 52px; border-radius: 50%;
  background: var(--blue-light); display: flex; align-items: center; justify-content: center; color: var(--blue); }
.platform h3 { font-size: 17px; margin-bottom: 6px; }
.platform p { font-size: 13.5px; color: var(--muted); margin-bottom: 14px; }
.platform a { font-size: 14px; font-weight: 600; }

/* 功能深讲 */
.feature-deep { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: start; }
.feature-deep h3 { font-size: 21px; margin: 22px 0 8px; }
.feature-deep h3:first-child { margin-top: 0; }
.feature-deep p { color: var(--muted); margin-bottom: 10px; }
.check-list { list-style: none; }
.check-list li { padding: 10px 0 10px 34px; position: relative; border-bottom: 1px dashed var(--line); color: var(--ink); }
.check-list li svg { position: absolute; left: 4px; top: 14px; color: var(--blue); }

/* 数据背书 */
.data-band { background: var(--blue-dark); color: #fff; border-radius: 18px; padding: 48px; display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; text-align: center; }
.data-band .num { font-size: 34px; font-weight: 800; display: block; margin-bottom: 6px; }
.data-band .lbl { font-size: 14px; opacity: .85; }

/* 评价 */
.quote-card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 26px; }
.quote-card p { color: var(--ink); font-size: 15px; margin-bottom: 16px; }
.quote-card .who { display: flex; align-items: center; gap: 12px; }
.quote-card .avatar { width: 40px; height: 40px; border-radius: 50%; background: var(--blue-light); color: var(--blue); display: flex; align-items: center; justify-content: center; font-weight: 700; }
.quote-card .who b { display: block; font-size: 14.5px; }
.quote-card .who span { font-size: 13px; color: var(--muted); }

/* 对比表 */
.cmp-table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 14px; overflow: hidden; border: 1px solid var(--line); }
.cmp-table th, .cmp-table td { padding: 15px 18px; text-align: left; border-bottom: 1px solid var(--line); font-size: 15px; }
.cmp-table thead th { background: var(--blue-light); color: var(--blue-dark); font-size: 15px; }
.cmp-table tbody tr:last-child td { border-bottom: none; }
.cmp-table td.y { color: #0d8a3f; font-weight: 600; }
.cmp-table td.n { color: #b03a2e; }

/* FAQ */
.faq-item { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 22px 26px; margin-bottom: 14px; }
.faq-item h3 { font-size: 16.5px; margin-bottom: 8px; display: flex; gap: 10px; align-items: baseline; }
.faq-item h3 .q { color: var(--blue); font-weight: 800; }
.faq-item p { color: var(--muted); font-size: 15px; }

/* CTA 带 */
.cta-band {
  background: linear-gradient(120deg, var(--blue-dark), var(--blue));
  color: #fff; border-radius: 18px; padding: 52px; text-align: center;
}
.cta-band h2 { font-size: 28px; margin-bottom: 12px; }
.cta-band p { opacity: .9; margin-bottom: 26px; }

/* 页脚 */
.site-footer { background: #101828; color: #9aa5ba; padding: 48px 0 30px; margin-top: 0; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 30px; }
.site-footer h4 { color: #fff; font-size: 15px; margin-bottom: 12px; }
.site-footer a { color: #9aa5ba; display: block; padding: 3px 0; }
.site-footer a:hover { color: #fff; }
.footer-note { border-top: 1px solid #232d42; padding-top: 20px; line-height: 1.9; }
.footer-note .safe { color: #7fd6a2; }

/* 返回顶部 */
.backtop {
  position: fixed; right: 26px; bottom: 26px; width: 44px; height: 44px;
  border-radius: 50%; background: var(--blue); color: #fff; border: none; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; pointer-events: none; transition: opacity .2s ease; box-shadow: 0 6px 16px rgba(26,92,255,.4);
}
.backtop.is-show { opacity: 1; pointer-events: auto; }

/* 下载页 */
.dl-hero-panel {
  background: linear-gradient(135deg, #0e3fc0, #2f74ff);
  border-radius: 20px; color: #fff; padding: 48px; display: grid;
  grid-template-columns: 1.4fr 1fr; gap: 36px; align-items: center;
}
.dl-hero-panel h2 { font-size: 27px; margin-bottom: 12px; }
.dl-hero-panel p { opacity: .92; margin-bottom: 22px; }
.dl-meta { background: rgba(255,255,255,.1); border-radius: 12px; padding: 22px 26px; font-size: 14.5px; }
.dl-meta div { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px dashed rgba(255,255,255,.25); }
.dl-meta div:last-child { border-bottom: none; }

.steps { counter-reset: step; }
.step { display: flex; gap: 20px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.step:last-child { border-bottom: none; }
.step .no {
  counter-increment: step; flex: none; width: 40px; height: 40px; border-radius: 50%;
  background: var(--blue); color: #fff; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step .no::before { content: counter(step); }
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 15px; }

.req-table { width: 100%; border-collapse: collapse; background:#fff; border:1px solid var(--line); border-radius: 14px; overflow: hidden; }
.req-table th, .req-table td { padding: 13px 18px; border-bottom: 1px solid var(--line); text-align: left; font-size: 15px; }
.req-table thead th { background: var(--bg-soft); }
.req-table tbody tr:last-child td { border-bottom: none; }

.ver-list { list-style: none; }
.ver-list li { padding: 18px 0; border-bottom: 1px dashed var(--line); display: flex; gap: 18px; }
.ver-list li:last-child { border-bottom: none; }
.ver-list .tag { flex: none; background: var(--blue-light); color: var(--blue-dark); border-radius: 8px; padding: 4px 12px; font-size: 13px; font-weight: 700; height: fit-content; }
.ver-list b { display: block; margin-bottom: 4px; }
.ver-list p { color: var(--muted); font-size: 14.5px; }

/* 中文页长文 */
.article-body { max-width: 820px; margin: 0 auto; }
.article-body h2 { font-size: 26px; margin: 44px 0 14px; }
.article-body h3 { font-size: 19px; margin: 26px 0 10px; }
.article-body p { margin-bottom: 16px; color: #333c4f; }
.article-body ul { margin: 0 0 16px 22px; color: #333c4f; }
.article-body li { margin-bottom: 6px; }
.article-hero { background: var(--bg-soft); border-bottom: 1px solid var(--line); padding: 56px 0; }
.article-hero h1 { font-size: 34px; max-width: 820px; margin: 0 auto 14px; }
.article-hero .meta { max-width: 820px; margin: 0 auto; color: var(--muted); font-size: 14px; }

@media (max-width: 900px) {
  .grid-3, .platform-row, .data-band { grid-template-columns: 1fr 1fr; }
  .feature-deep, .grid-2, .dl-hero-panel, .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .main-nav a { padding: 8px 10px; font-size: 14px; }
}
@media (max-width: 560px) {
  .grid-3, .platform-row, .data-band { grid-template-columns: 1fr; }
  .hero { padding: 56px 0; }
  .section { padding: 48px 0; }
  .cta-band, .dl-hero-panel { padding: 32px 22px; }
}