:root {
  --ink: #0c1a2b;
  --ink2: #1e3a5f;
  --brand: #1652f0;
  --brand-d: #0d3fc4;
  --accent: #00c2a8;
  --muted: #5d6f82;
  --line: #e4ebf3;
  --soft: #f6f9fd;
  --radius: 14px;
  --shadow: 0 8px 28px rgba(12,26,43,.09);
  --max: 1200px;
  --header-h: 68px;
}

/* ========== 基础重置 ========== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: #fff;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4, p { margin: 0; }
button { font: inherit; }

.wrap { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 20px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ========== 顶部通栏 ========== */
.topbar { background: var(--ink); color: rgba(255,255,255,.82); font-size: 13px; line-height: 1; }
.topbar .wrap { display: flex; justify-content: space-between; align-items: center; height: 38px; gap: 16px; }
.topbar a { color: rgba(255,255,255,.82); }
.topbar a:hover { color: #fff; }
.topbar .tb-right { display: flex; gap: 18px; align-items: center; }

/* ========== 头部导航 ========== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.94);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
  transition: box-shadow .25s ease;
}
.site-header.scrolled { box-shadow: 0 4px 22px rgba(12,26,43,.09); }
.nav { display: flex; align-items: center; justify-content: space-between; height: var(--header-h); gap: 16px; }

.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: -.02em; flex: none; }
.logo svg { flex: none; }
.logo small { display: block; font-size: 11px; font-weight: 500; color: var(--muted); letter-spacing: .06em; line-height: 1; }

.menu { display: flex; align-items: center; gap: 4px; }
.menu a { display: block; padding: 10px 15px; border-radius: 10px; font-size: 15px; font-weight: 500; color: var(--ink2); transition: background .2s, color .2s; }
.menu a:hover, .menu a[aria-current="page"] { background: var(--soft); color: var(--brand); }

.nav-cta { display: flex; align-items: center; gap: 10px; flex: none; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 0 24px; border: 0; border-radius: 12px;
  font-size: 15.5px; font-weight: 600; cursor: pointer;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--brand); color: #fff; box-shadow: 0 6px 18px rgba(22,82,240,.28); }
.btn-primary:hover { background: var(--brand-d); transform: translateY(-2px); box-shadow: 0 10px 24px rgba(22,82,240,.34); }
.btn-light { background: #fff; color: var(--brand); }
.btn-light:hover { transform: translateY(-2px); box-shadow: 0 10px 24px rgba(0,0,0,.18); }
.btn-ghost { background: transparent; color: #fff; border: 1.5px solid rgba(255,255,255,.5); }
.btn-ghost:hover { background: rgba(255,255,255,.12); border-color: #fff; }
.btn-block { width: 100%; }

/* 汉堡按钮 */
.burger {
  display: none; flex-direction: column; justify-content: center; gap: 5px;
  width: 46px; height: 46px; padding: 0 11px;
  background: transparent; border: 1px solid var(--line); border-radius: 12px; cursor: pointer;
}
.burger span { display: block; height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: .28s ease; }
.burger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger.active span:nth-child(2) { opacity: 0; }
.burger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ========== Hero ========== */
.hero {
  position: relative; overflow: hidden;
  background: linear-gradient(155deg, #0a1729 0%, #123a7a 52%, #1652f0 100%);
  color: #fff; padding: 84px 0 88px;
}
.hero::before, .hero::after { content: ""; position: absolute; border-radius: 50%; pointer-events: none; }
.hero::before { width: 560px; height: 560px; top: -200px; right: -140px; background: radial-gradient(circle, rgba(0,194,168,.38), transparent 68%); }
.hero::after { width: 420px; height: 420px; bottom: -180px; left: -120px; background: radial-gradient(circle, rgba(22,82,240,.5), transparent 70%); }
.hero .wrap { position: relative; z-index: 1; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 15px; border-radius: 999px; margin-bottom: 22px;
  background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.2);
  font-size: 13.5px; font-weight: 500; letter-spacing: .01em;
}
.hero-badge i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 4px rgba(0,194,168,.25); }
.hero h1 { font-size: clamp(28px, 5.6vw, 52px); line-height: 1.22; letter-spacing: -.02em; font-weight: 800; max-width: 16em; margin-bottom: 20px; }
.hero h1 em { font-style: normal; color: #7ef2dd; }
.hero p.lead { font-size: clamp(15px, 2.2vw, 18px); color: rgba(255,255,255,.85); max-width: 38em; margin-bottom: 34px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 8px; }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 52px; padding-top: 30px; border-top: 1px solid rgba(255,255,255,.18); }
.stats strong { display: block; font-size: clamp(22px, 4vw, 32px); font-weight: 800; letter-spacing: -.02em; line-height: 1.2; }
.stats span { font-size: 13.5px; color: rgba(255,255,255,.7); }

/* ========== 通用区块 ========== */
.section { padding: 76px 0; }
.section.alt { background: var(--soft); }
.sec-head { max-width: 740px; margin: 0 auto 46px; text-align: center; }
.sec-tag { display: inline-block; margin-bottom: 12px; padding: 5px 14px; border-radius: 999px; background: rgba(22,82,240,.08); color: var(--brand); font-size: 13px; font-weight: 700; letter-spacing: .06em; }
.sec-head h2 { font-size: clamp(24px, 4.2vw, 36px); line-height: 1.3; letter-spacing: -.02em; margin-bottom: 14px; }
.sec-head p { color: var(--muted); font-size: 16px; }

.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ========== 卡片 ========== */
.card {
  display: block;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 28px 24px; height: 100%;
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover { transform: translateY(-5px); box-shadow: var(--shadow); border-color: #cfe0ff; }
.card h3 { font-size: 18px; margin-bottom: 10px; letter-spacing: -.01em; color: var(--ink); }
.card p { color: var(--muted); font-size: 14.6px; line-height: 1.75; }

.ico {
  width: 48px; height: 48px; border-radius: 13px; margin-bottom: 16px;
  display: grid; place-items: center; color: #fff; font-size: 24px;
  background: linear-gradient(135deg, #1652f0, #00c2a8);
  box-shadow: 0 6px 16px rgba(22,82,240,.24);
}

/* ========== 案例 ========== */
.case { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--line); background: #fff; transition: transform .25s ease, box-shadow .25s ease; }
.case:hover { transform: translateY(-5px); box-shadow: var(--shadow); }
.case-thumb { height: 170px; display: grid; place-items: center; color: #fff; font-weight: 800; font-size: 20px; letter-spacing: .04em; }
.case-thumb.c1 { background: linear-gradient(135deg, #123a7a, #1652f0); }
.case-thumb.c2 { background: linear-gradient(135deg, #0b7a6a, #00c2a8); }
.case-thumb.c3 { background: linear-gradient(135deg, #3b2a7a, #7c5cff); }
.case-body { padding: 22px; }
.case-body h3 { font-size: 17px; margin-bottom: 8px; color: var(--ink); }
.case-body p { color: var(--muted); font-size: 14.4px; margin-bottom: 14px; }
.case-meta { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-size: 12.5px; padding: 4px 11px; border-radius: 999px; background: var(--soft); color: var(--ink2); border: 1px solid var(--line); }

/* ========== 关于 ========== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.about-grid h2 { font-size: clamp(24px, 4vw, 34px); line-height: 1.3; letter-spacing: -.02em; margin-bottom: 18px; }
.about-grid > div > p { color: var(--muted); margin-bottom: 16px; }
.about-list { display: grid; gap: 14px; margin-top: 26px; }
.about-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; }
.about-list svg { flex: none; margin-top: 4px; }
.about-visual { border-radius: 18px; padding: 36px 30px; color: #fff; background: linear-gradient(150deg, #0c1a2b, #1652f0); box-shadow: 0 20px 50px rgba(12,26,43,.22); }
.about-visual .kpi { display: grid; grid-template-columns: 1fr 1fr; gap: 26px; }
.about-visual .kpi strong { display: block; font-size: 30px; font-weight: 800; letter-spacing: -.02em; }
.about-visual .kpi span { font-size: 13.5px; color: rgba(255,255,255,.72); }

/* ========== 评价 ========== */
.quote { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 24px; height: 100%; display: flex; flex-direction: column; gap: 16px; margin: 0; }
.quote p { color: var(--ink2); font-size: 15px; line-height: 1.8; flex: 1; margin: 0; }
.quote-user { display: flex; align-items: center; gap: 12px; }
.avatar { width: 44px; height: 44px; border-radius: 50%; flex: none; display: grid; place-items: center; color: #fff; font-weight: 700; font-size: 16px; background: linear-gradient(135deg, #1652f0, #00c2a8); }
.quote-user strong { display: block; font-size: 14.6px; }
.quote-user span { font-size: 13px; color: var(--muted); }

/* ========== FAQ ========== */
.faq-wrap { max-width: 860px; margin: 0 auto; }
details { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 0 20px; margin-bottom: 12px; transition: border-color .2s; }
details[open] { border-color: #cfe0ff; }
summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; gap: 14px; padding: 18px 0; font-weight: 600; font-size: 16px; color: var(--ink); }
summary::-webkit-details-marker { display: none; }
summary::after { content: "+"; font-size: 22px; font-weight: 400; color: var(--brand); flex: none; line-height: 1; transition: transform .22s ease; }
details[open] summary::after { transform: rotate(45deg); }
details p { color: var(--muted); font-size: 14.8px; padding-bottom: 18px; margin: 0; }

/* ========== 联系 / 表单 ========== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.15fr; gap: 52px; align-items: start; }
.contact-info h2 { font-size: clamp(24px, 4vw, 32px); line-height: 1.3; letter-spacing: -.02em; margin-bottom: 16px; }
.contact-info > p { color: var(--muted); margin-bottom: 30px; }
.contact-item { display: flex; gap: 14px; align-items: flex-start; margin-bottom: 22px; }
.contact-item .ci { width: 44px; height: 44px; border-radius: 12px; flex: none; display: grid; place-items: center; background: var(--soft); color: var(--brand); border: 1px solid var(--line); }
.contact-item strong { display: block; font-size: 15px; margin-bottom: 2px; }
.contact-item span { font-size: 14.4px; color: var(--muted); word-break: break-all; }

.form-card { background: #fff; border: 1px solid var(--line); border-radius: 18px; padding: 32px 28px; box-shadow: var(--shadow); }
.form-card h3 { font-size: 19px; margin-bottom: 6px; }
.form-card > p { color: var(--muted); font-size: 14.4px; margin-bottom: 22px; }
.form { display: grid; gap: 15px; }
.field { display: grid; gap: 6px; }
.field label { font-size: 14px; font-weight: 600; color: var(--ink2); }
.field label .req { color: #e5484d; }
.field input, .field textarea { width: 100%; padding: 13px 14px; border: 1px solid var(--line); border-radius: 11px; font-family: inherit; font-size: 16px; color: var(--ink); background: #fff; transition: border-color .2s, box-shadow .2s; }
.field textarea { min-height: 104px; resize: vertical; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--brand); box-shadow: 0 0 0 3px rgba(22,82,240,.14); }
.form-note { font-size: 12.8px; color: var(--muted); text-align: center; margin-top: 2px; }

/* ========== 页脚 ========== */
.site-footer { background: #0a1729; color: rgba(255,255,255,.72); padding: 60px 0 0; font-size: 14.4px; }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: 40px; padding-bottom: 44px; }
.site-footer h4 { color: #fff; font-size: 15.5px; margin-bottom: 18px; letter-spacing: .01em; }
.site-footer .logo { color: #fff; margin-bottom: 16px; }
.site-footer .logo small { color: rgba(255,255,255,.55); }
.footer-links { display: grid; gap: 11px; }
.footer-links a { transition: color .2s; color: rgba(255,255,255,.72); }
.footer-links a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.12); padding: 22px 0 28px; display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; font-size: 13.4px; color: rgba(255,255,255,.55); }
.footer-bottom a:hover { color: #fff; }

/* ========== 移动端底部转化条 ========== */
.mobile-bar { display: none; position: fixed; left: 0; right: 0; bottom: 0; z-index: 90; background: rgba(255,255,255,.97); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); border-top: 1px solid var(--line); padding: 10px 14px calc(10px + env(safe-area-inset-bottom)); gap: 10px; }
.mobile-bar .btn { flex: 1; min-height: 48px; padding: 0 12px; font-size: 15px; }

/* ========== 面包屑 ========== */
.breadcrumb { border-bottom: 1px solid var(--line); background: var(--soft); font-size: 13.5px; }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; padding: 12px 0; list-style: none; margin: 0; }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: #b9c6d4; }
.breadcrumb a { color: var(--brand); }
.breadcrumb a:hover { text-decoration: underline; }

/* ========== 滚动进场动画 ========== */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .about-grid { gap: 40px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 34px; }
}

@media (max-width: 900px) {
  body { padding-bottom: 70px; }
  .topbar { display: none; }
  .burger { display: flex; }
  
  .menu {
    position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; padding: 12px 20px 40px; overflow-y: auto;
    transform: translateX(100%);
    transition: transform .3s cubic-bezier(.4,0,.2,1);
    border-top: 1px solid var(--line); margin: 0;
  }
  .menu.open { transform: translateX(0); }
  .menu a { padding: 17px 4px; font-size: 17px; border-radius: 0; border-bottom: 1px solid var(--line); }
  .menu a:hover { background: transparent; color: var(--brand); }
  .menu .menu-cta { margin-top: 20px; padding: 15px; text-align: center; background: var(--brand); color: #fff; border-radius: 12px; border: 0; font-weight: 600; }
  .menu .menu-cta:hover { color: #fff; background: var(--brand-d); }
  
  .nav-cta .btn { display: none; }
  .mobile-bar { display: flex; }
  .hero { padding: 56px 0 64px; }
  .hero-actions .btn { flex: 1; min-width: 140px; }
  .section { padding: 56px 0; }
  .sec-head { margin-bottom: 34px; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 34px; }
  .about-visual { padding: 30px 24px; }
  .contact-grid { grid-template-columns: 1fr; gap: 38px; }
  .form-card { padding: 26px 20px; }
  .stats { grid-template-columns: repeat(2, 1fr); gap: 22px; margin-top: 38px; padding-top: 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; padding-bottom: 32px; }
  .site-footer { padding-top: 44px; }
  .footer-bottom { justify-content: flex-start; text-align: left; }
}

@media (max-width: 420px) {
  .wrap { padding: 0 16px; }
  .logo { font-size: 17px; }
  .hero h1 { font-size: 26px; }
  .card { padding: 22px 18px; }
  .btn { padding: 0 18px; font-size: 15px; }
  .grid-4 { grid-template-columns: 1fr; }
  .mobile-bar .btn { font-size: 14.5px; padding: 0 8px; }
}