:root {
  --blue: #2B59FF;
  --blue-dark: #1e3fc4;
  --ink: #16203a;
  --muted: #5b667e;
  --bg: #ffffff;
  --bg-alt: #f5f7fb;
  --line: #e6eaf2;
  --radius: 14px;
  --maxw: 1140px;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--blue); color: #fff; display: grid; place-items: center;
  font-weight: 900; font-size: 14px; letter-spacing: .5px;
}
.brand-name { font-size: 17px; }
/* 品牌 logo（图片版）：页头用深色版，页脚深色底用浅色版 */
.brand-logo { height: 30px; width: auto; display: block; }
.site-footer .brand-logo { height: 34px; }
.nav { display: flex; align-items: center; gap: 22px; font-size: 15px; }
.nav a { color: var(--muted); transition: color .2s; }
.nav a:hover { color: var(--ink); }
.nav-cta {
  background: var(--blue); color: #fff !important; padding: 8px 16px; border-radius: 999px; font-weight: 500;
}
.nav-cta:hover { background: var(--blue-dark); }
.nav-toggle { display: none; background: none; border: 0; font-size: 22px; cursor: pointer; color: var(--ink); }

/* Hero */
.hero { background: linear-gradient(180deg, #eef3ff 0%, #f7f9ff 100%); padding: 72px 0 64px; }
.hero-eyebrow { color: var(--blue); font-weight: 700; letter-spacing: 2px; font-size: 13px; margin: 0 0 14px; }
.hero-title { font-size: clamp(30px, 5vw, 52px); line-height: 1.18; margin: 0 0 18px; font-weight: 900; }
.hero-sub { font-size: 18px; color: var(--muted); max-width: 720px; margin: 0 0 28px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats { list-style: none; display: flex; gap: 36px; padding: 0; margin: 40px 0 0; flex-wrap: wrap; }
.hero-stats li { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 18px; color: var(--blue); }
.hero-stats span { color: var(--muted); font-size: 14px; }

.btn { display: inline-block; padding: 13px 26px; border-radius: 999px; font-weight: 600; font-size: 15px; transition: transform .15s, background .2s; }
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-dark); transform: translateY(-1px); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* Sections */
.section { padding: 72px 0; }
.section-alt { background: var(--bg-alt); }
.section-eyebrow { color: var(--blue); font-weight: 700; letter-spacing: 1.5px; font-size: 13px; margin: 0 0 10px; }
.section-title { font-size: clamp(24px, 3.4vw, 36px); margin: 0 0 16px; font-weight: 800; }
.section-lead { font-size: 17px; color: var(--muted); max-width: 820px; margin: 0; }

.grid { display: grid; gap: 22px; margin-top: 36px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.card { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; transition: box-shadow .2s, transform .2s; }
.section-alt .card { background: #fff; }
.card:hover { box-shadow: 0 12px 30px rgba(43,89,255,.10); transform: translateY(-3px); }
.card-ico { width: 46px; height: 46px; border-radius: 12px; background: #eef3ff; color: var(--blue); display: grid; place-items: center; font-size: 22px; margin-bottom: 14px; }
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card-mini h3 { font-size: 17px; }

.two-col { display: grid; grid-template-columns: 1.1fr .9fr; gap: 44px; align-items: center; }
.check-list { list-style: none; padding: 0; margin: 18px 0 0; }
.check-list li { padding-left: 28px; position: relative; margin: 10px 0; color: var(--ink); }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--blue); font-weight: 700; }

.panel { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; }
.panel-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 0; border-bottom: 1px dashed var(--line); }
.panel-row:last-of-type { border-bottom: 0; }
.dot { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 12px; }
.dot.ok { background: #1D9E75; }
.dot.warn { background: #EDA83D; }
.panel-bar { height: 8px; background: var(--bg-alt); border-radius: 999px; margin-top: 14px; overflow: hidden; }
.panel-bar-fill { width: 78%; height: 100%; background: linear-gradient(90deg, var(--blue), #6f8bff); }

/* FAQ */
.faq { margin-top: 28px; }
.faq-item { border: 1px solid var(--line); border-radius: 12px; padding: 4px 18px; margin-bottom: 12px; background: #fff; }
.faq-item summary { cursor: pointer; font-weight: 600; padding: 14px 0; list-style: none; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: "+"; float: right; color: var(--blue); font-size: 20px; }
.faq-item[open] summary::after { content: "−"; }
.faq-item p { margin: 0 0 16px; color: var(--muted); }
.faq-more { margin-top: 16px; }
.faq-more a { color: var(--blue); font-weight: 600; }

/* CTA / contact */
.section-cta { background: linear-gradient(135deg, #1e3fc4 0%, #2B59FF 100%); color: #fff; }
.section-cta .section-eyebrow, .section-cta .section-title, .section-cta .section-lead { color: #fff; }
.section-cta .section-lead { opacity: .9; }
.contact-meta { list-style: none; padding: 0; margin: 18px 0 0; }
.contact-meta li { margin: 8px 0; font-size: 15px; }
.contact-meta a { color: #cdd9ff; text-decoration: underline; }
.contact-form { background: #fff; color: var(--ink); border-radius: var(--radius); padding: 26px; display: grid; gap: 14px; }
.contact-form label { display: grid; gap: 6px; font-size: 14px; font-weight: 600; color: var(--muted); }
.contact-form input, .contact-form select, .contact-form textarea {
  border: 1px solid var(--line); border-radius: 10px; padding: 11px 13px; font: inherit; color: var(--ink); background: #fff; width: 100%;
}
.contact-form .btn { justify-self: start; border: 0; cursor: pointer; }
.form-note { font-size: 12px; color: var(--muted); margin: 0; }

/* Footer */
.site-footer { background: #0f1830; color: #c7d0e6; padding: 48px 0 28px; }
.footer-grid { display: flex; justify-content: space-between; gap: 30px; flex-wrap: wrap; }
.site-footer .brand-name { color: #fff; }
.footer-desc { color: #8a96b5; margin-top: 10px; font-size: 14px; max-width: 280px; }
.footer-nav { display: flex; gap: 18px; flex-wrap: wrap; align-items: flex-start; }
.footer-nav a { color: #c7d0e6; font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.footer-bottom { display: flex; gap: 20px; flex-wrap: wrap; border-top: 1px solid #1c2748; margin-top: 30px; padding-top: 18px; font-size: 13px; color: #8a96b5; }

/* Reveal animation */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* Responsive */
@media (max-width: 900px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .two-col { grid-template-columns: 1fr; gap: 28px; }
}
@media (max-width: 640px) {
  .nav { display: none; position: absolute; top: 64px; left: 0; right: 0; background: #fff; flex-direction: column; padding: 16px 20px; border-bottom: 1px solid var(--line); }
  .nav.open { display: flex; }
  .nav a { padding: 8px 0; }
  .nav-toggle { display: block; }
  .grid-3 { grid-template-columns: 1fr; }
  .hero { padding: 48px 0; }
  .section { padding: 52px 0; }
  .hero-stats { gap: 22px; }
}

/* 新增：痛点两列布局 / 解法标记（首页四道坎） */
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.card .solve { margin: 10px 0 0; font-size: 13px; font-weight: 600; color: var(--blue); }
@media (max-width: 640px) {
  .grid-2 { grid-template-columns: 1fr; }
}

/* 新增：功能详情页分组标题 */
.group { margin-top: 8px; }
.group-title { font-size: 21px; font-weight: 800; margin: 46px 0 4px; }
.group-sub { color: var(--muted); margin: 0 0 6px; font-size: 15px; }

/* 新增：面包屑导航（知识库 / FAQ 等内页共用） */
.breadcrumb { font-size: 13px; color: var(--muted); margin-top: 12px; }
.breadcrumb a { color: var(--muted); }
.breadcrumb a:hover { color: var(--blue); }
.breadcrumb span { color: var(--ink); }

/* 新增：知识库文章正文排版（术语词条等长文页） */
.kb-answer { font-size: 17px; line-height: 1.85; }
.kb-answer strong { color: var(--ink); }
.card-mini h3 a { color: var(--ink); }
.card-mini h3 a:hover { color: var(--blue); }
.card-mini h3 a::after { content: " →"; color: var(--blue); font-weight: 400; }