/* ============ 基础 ============ */
:root {
  --primary: #0e7ff0;
  --primary-dark: #0b6ad0;
  --green: #10b981;
  --accent: #f59e0b;
  --bg: #f8fafc;
  --text: #1e293b;
  --muted: #64748b;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 4px 20px rgba(15, 23, 42, .08);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id], .card[id] { scroll-margin-top: 84px; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
.container { max-width: 1150px; margin: 0 auto; padding: 0 24px; }

/* ============ 导航 ============ */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid #e2e8f0;
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 66px;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 21px; font-weight: 700; }
.logo .mark {
  width: 36px; height: 36px; border-radius: 10px;
  background: linear-gradient(135deg, #0ea5e9, var(--green));
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.nav-links { display: flex; gap: 32px; font-size: 15px; }
.nav-links a { color: var(--muted); transition: color .2s; }
.nav-links a:hover, .nav-links a.active { color: var(--primary); font-weight: 600; }
.nav-actions { display: flex; align-items: center; gap: 12px; }
.nav-actions .btn { padding: 8px 20px; font-size: 14.5px; }
.menu-toggle {
  display: none; background: none; border: none; cursor: pointer;
  font-size: 24px; color: var(--text); line-height: 1; padding: 4px 2px;
}
.btn {
  display: inline-block; padding: 10px 24px; border-radius: 999px;
  font-size: 15px; font-weight: 600; cursor: pointer; border: none;
  transition: all .25s;
}
.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(37,99,235,.45); }
.btn-outline {
  border: 1.5px solid var(--primary); color: var(--primary); background: transparent;
}
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 17px; }

/* ============ Hero ============ */
.hero {
  padding: 90px 0 70px;
  background:
    radial-gradient(1000px 500px at 80% -10%, rgba(37,99,235,.12), transparent),
    radial-gradient(700px 400px at 10% 110%, rgba(16,185,129,.12), transparent);
}
.hero-inner { display: flex; align-items: center; gap: 50px; flex-wrap: wrap; }
.hero-text { flex: 1.1; min-width: 320px; }
.hero-visual { flex: 1; min-width: 300px; }
.tag {
  display: inline-block; padding: 6px 16px; border-radius: 999px;
  background: #e0eaff; color: var(--primary);
  font-size: 13.5px; font-weight: 600; margin-bottom: 20px;
}
.hero h1 { font-size: 42px; line-height: 1.3; margin-bottom: 20px; }
.hero h1 .hl { color: var(--primary); }
.hero p.lead { font-size: 17px; color: var(--muted); margin-bottom: 32px; max-width: 520px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-badges { display: flex; gap: 20px; margin-top: 24px; flex-wrap: wrap; }
.hero-badges span {
  font-size: 13px; color: var(--muted);
  display: inline-flex; align-items: center; gap: 7px;
}
.hero-badges span::before {
  content: ""; width: 6px; height: 6px; border-radius: 50%;
  background: var(--green); flex-shrink: 0;
}

/* 卡片"了解更多"链接 */
.card .more {
  display: inline-block; margin-top: 14px;
  font-size: 13.5px; color: var(--primary); font-weight: 600;
}
.card .more:hover { text-decoration: underline; }

/* 滚动渐显 */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* Hero 模拟界面 */
.mockup {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); border: 1px solid #e8edf5;
  padding: 20px; transform: rotate(1.2deg);
}
.mockup-head { display: flex; gap: 6px; margin-bottom: 14px; }
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #f87171; } .dot.y { background: #fbbf24; } .dot.g { background: #34d399; }
.flow-row {
  display: flex; align-items: center; gap: 10px;
  background: #f1f5fb; border-radius: 10px; padding: 12px 14px; margin-bottom: 10px;
  font-size: 13.5px;
}
.flow-row .chip {
  padding: 4px 10px; border-radius: 6px; font-weight: 600; font-size: 12.5px; color: #fff;
}
.chip.tb { background: #ff5000; } .chip.pdd { background: #e02e24; }
.chip.erp { background: var(--primary); } .chip.ozon { background: #005bff; }
.arrow { color: #94a3b8; font-weight: 700; }
.progress {
  height: 7px; background: #e2e8f0; border-radius: 99px; overflow: hidden; margin-top: 4px;
}
.progress i { display: block; height: 100%; background: linear-gradient(90deg, var(--primary), #34d399); }

/* ============ 通用 Section ============ */
.section { padding: 80px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; max-width: 660px; margin: 0 auto 56px; }
.section-head h2 { font-size: 32px; margin-bottom: 22px; position: relative; }
.section-head h2::after {
  content: ""; display: block; width: 40px; height: 4px; border-radius: 99px;
  background: linear-gradient(90deg, #0ea5e9, var(--green));
  margin: 16px auto 0;
}
.section-head p { color: var(--muted); font-size: 16px; }
.section-head .more-link {
  display: inline-block; margin-top: 16px; font-size: 14.5px;
  color: var(--primary); font-weight: 600;
}
.section-head .more-link:hover { text-decoration: underline; }

.grid { display: grid; gap: 26px; }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); }

.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 32px 28px;
  border: 1px solid #eef2f8; transition: transform .25s, box-shadow .25s;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 12px 32px rgba(15,23,42,.12); }
.card .icon {
  width: 52px; height: 52px; border-radius: 12px; font-size: 26px;
  display: flex; align-items: center; justify-content: center;
  background: #e8efff; margin-bottom: 18px;
}
.card h3 { font-size: 19px; margin-bottom: 10px; }
.card p { color: var(--muted); font-size: 14.5px; }

/* ============ 平台条 ============ */
.platforms {
  display: flex; justify-content: center; align-items: center; gap: 18px;
  flex-wrap: wrap; font-weight: 700;
}
.plat {
  padding: 12px 26px; border-radius: 10px; color: #fff; font-size: 16px;
  box-shadow: var(--shadow);
}

/* ============ 步骤 ============ */
.steps { counter-reset: step; }
.step { display: flex; gap: 24px; margin-bottom: 34px; }
.step-num {
  flex-shrink: 0; width: 52px; height: 52px; border-radius: 50%;
  background: linear-gradient(135deg, #0ea5e9, var(--green));
  color: #fff; font-size: 22px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.step h3 { font-size: 19px; margin-bottom: 8px; }
.step p { color: var(--muted); font-size: 15px; }

/* ============ 对比表 ============ */
.table-wrap { overflow-x: auto; border-radius: var(--radius); -webkit-overflow-scrolling: touch; }
.compare { width: 100%; border-collapse: collapse; background: #fff; box-shadow: var(--shadow); min-width: 560px; }
.compare th, .compare td { padding: 16px 22px; text-align: left; font-size: 15px; border-bottom: 1px solid #eef2f8; }
.compare th { background: #f1f5fb; font-size: 14.5px; }
.compare .yes { color: #16a34a; font-weight: 700; }
.compare .no { color: #dc2626; font-weight: 700; }
.compare td:first-child { font-weight: 600; }

/* ============ CTA ============ */
.cta {
  background: linear-gradient(135deg, #0b6ad0, var(--primary) 50%, var(--green));
  color: #fff; text-align: center; padding: 76px 24px; border-radius: 22px;
  margin: 40px auto; max-width: 1100px;
}
.cta h2 { font-size: 30px; margin-bottom: 14px; }
.cta p { opacity: .85; margin-bottom: 30px; font-size: 16px; }
.cta .btn { background: #fff; color: var(--primary); }

/* ============ FAQ ============ */
.faq-item { background: #fff; border-radius: 12px; box-shadow: var(--shadow); margin-bottom: 14px; overflow: hidden; }
.faq-q {
  padding: 18px 24px; font-weight: 600; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center;
}
.faq-q::after { content: "+"; font-size: 20px; color: var(--primary); }
.faq-item.open .faq-q::after { content: "−"; }
.faq-a { max-height: 0; overflow: hidden; transition: max-height .3s; color: var(--muted); font-size: 14.5px; }
.faq-item.open .faq-a { max-height: 200px; }
.faq-a-inner { padding: 0 24px 20px; }

/* ============ 关于我们 ============ */
.about-grid { display: flex; align-items: center; gap: 44px; flex-wrap: wrap; }
.about-img { flex: 1.1; min-width: 300px; }
.about-img img {
  width: 100%; border-radius: var(--radius); box-shadow: var(--shadow);
  display: block;
}
.about-text { flex: 1; min-width: 300px; }
.about-text h2 { font-size: 28px; margin-bottom: 16px; }
.about-text p { color: var(--muted); font-size: 15.5px; margin-bottom: 12px; }
.about-points { list-style: none; margin-top: 18px; }
.about-points li {
  padding: 7px 0 7px 30px; position: relative; font-size: 15px; color: var(--text);
}
.about-points li::before {
  content: "✓"; position: absolute; left: 0; top: 7px;
  width: 21px; height: 21px; border-radius: 50%;
  background: #d9f5e9; color: #059669; font-size: 12px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

/* ============ 发展历程 ============ */
.timeline { position: relative; max-width: 680px; margin: 0 auto; }
.timeline::before {
  content: ""; position: absolute; left: 15px; top: 8px; bottom: 8px;
  width: 2px; background: #dfe7f1;
}
.tl-item { position: relative; padding-left: 46px; margin-bottom: 34px; }
.tl-item:last-child { margin-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: 8px; top: 7px;
  width: 16px; height: 16px; border-radius: 50%;
  background: #fff; border: 4px solid var(--primary);
}
.tl-item .tl-date { font-size: 13px; color: var(--primary); font-weight: 700; letter-spacing: .5px; }
.tl-item h3 { font-size: 17px; margin: 2px 0 4px; }
.tl-item p { font-size: 14px; color: var(--muted); }

/* ============ 页脚 ============ */
.footer { background: #0f172a; color: #94a3b8; padding: 56px 0 24px; margin-top: 60px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
.footer h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer a { display: block; font-size: 14px; padding: 4px 0; }
.footer a:hover { color: #fff; }
.footer-bottom {
  border-top: 1px solid #1e293b; margin-top: 40px; padding-top: 22px;
  text-align: center; font-size: 13px;
}

/* ============ 功能页专属 ============ */
.page-hero {
  padding: 70px 0 50px; text-align: center;
  background: radial-gradient(800px 400px at 50% -20%, rgba(37,99,235,.14), transparent);
}
.page-hero h1 { font-size: 36px; margin-bottom: 14px; }
.page-hero p { color: var(--muted); font-size: 16.5px; max-width: 640px; margin: 0 auto; }

.sync-flow {
  display: flex; align-items: stretch; justify-content: center;
  margin: 50px 0;
}
.sync-node {
  flex: 1 1 200px; max-width: 250px;
  background: #fff; border: 2px solid #e2e8f0; border-radius: var(--radius);
  padding: 26px 18px; text-align: center;
  display: flex; flex-direction: column; justify-content: center;
  box-shadow: var(--shadow);
}
.sync-node .big { font-size: 34px; margin-bottom: 8px; }
.sync-node h3 { font-size: 17px; margin-bottom: 6px; }
.sync-node p { font-size: 13px; color: var(--muted); }
.sync-link {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 0 10px; color: var(--primary); font-size: 24px; font-weight: 700;
}
.sync-link small { font-size: 11px; color: var(--muted); margin-top: 2px; white-space: nowrap; }

/* ============ 信任数据条 ============ */
.trust-bar {
  display: flex; justify-content: center; gap: 0; flex-wrap: wrap;
  background: #fff; border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 28px 10px;
}
.trust-item { padding: 0 42px; text-align: center; border-right: 1px solid #eef2f8; }
.trust-item:last-child { border-right: none; }
.trust-item b { font-size: 26px; color: var(--primary); display: block; }
.trust-item span { font-size: 13.5px; color: var(--muted); }

/* ============ 产品优势 ============ */
.adv-item { display: flex; gap: 22px; margin-bottom: 26px; align-items: flex-start; }
.adv-num {
  flex-shrink: 0; width: 44px; height: 44px; border-radius: 12px;
  background: linear-gradient(135deg, #0ea5e9, var(--green));
  color: #fff; font-size: 17px; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}
.adv-item h3 { font-size: 18px; margin-bottom: 6px; }
.adv-item p { color: var(--muted); font-size: 14.5px; }

/* ============ 客户评价 ============ */
.testi { text-align: left; display: flex; flex-direction: column; }
.stars { color: #f59e0b; letter-spacing: 2px; margin-bottom: 12px; }
.testi blockquote { font-size: 14.5px; color: var(--text); flex: 1; }
.testi .who { display: flex; align-items: center; gap: 12px; margin-top: 18px; }
.testi .avatar {
  width: 42px; height: 42px; border-radius: 50%;
  background: linear-gradient(135deg, #0ea5e9, var(--green));
  color: #fff; font-weight: 700; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.testi .who b { display: block; font-size: 14.5px; }
.testi .who span { font-size: 12.5px; color: var(--muted); }

/* ============ 新闻动态 ============ */
.news-item { padding: 26px 24px; }
.news-item .date {
  font-size: 13px; color: var(--primary); font-weight: 600;
  background: #e6f1ff; border-radius: 6px; padding: 3px 10px;
  display: inline-block; margin-bottom: 12px;
}
.news-item h3 { font-size: 16.5px; margin-bottom: 8px; line-height: 1.5; }
.news-item h3 a:hover { color: var(--primary); }
.news-item p { font-size: 13.5px; color: var(--muted); }

/* ============ 页脚联系 ============ */
.footer-contact { margin-top: 10px; }
.footer-contact p { font-size: 13.5px; padding: 3px 0; }
.footer-contact b { color: #cbd5e1; font-weight: 600; }

@media (max-width: 1024px) {
  .sync-flow { flex-direction: column; align-items: center; }
  .sync-node { width: 100%; max-width: 340px; }
  .sync-link { transform: rotate(90deg); padding: 8px 0; }
}

@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .nav-links {
    display: none;
    position: absolute; top: 66px; left: 0; right: 0;
    flex-direction: column; gap: 2px;
    background: #fff; padding: 12px 24px 16px;
    border-bottom: 1px solid #e2e8f0; box-shadow: var(--shadow);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 9px 0; font-size: 15.5px; }
  .nav-actions { gap: 8px; }
  .nav-actions .btn { padding: 7px 14px; font-size: 14px; }
  .hero { padding: 56px 0 46px; }
  .hero h1 { font-size: 29px; }
  .section { padding: 54px 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .trust-item { border-right: none; padding: 8px 22px; }
  .cta { padding: 56px 20px; margin: 24px auto; }
  .cta h2 { font-size: 24px; }
}