:root {
  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --ink: #0f172a;
  --muted: #5b6472;
  --bg: #ffffff;
  --bg-soft: #f6f8fb;
  --line: #e6e9ef;
  --ok: #16a34a;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(15, 23, 42, .08);
  --maxw: 1160px;
  --header-h: 66px;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
.container { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* ===== 顶部导航 ===== */
.site-header {
  position: sticky; top: 0; z-index: 50;
  height: var(--header-h);
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; height: 100%; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.15rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-logo {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--brand), #7c3aed);
  display: grid; place-items: center; color: #fff; font-weight: 800;
}
.header-nav { display: flex; align-items: center; gap: 6px; margin-left: auto; }
.header-nav a.navlink { padding: 8px 13px; border-radius: 8px; color: var(--ink); font-weight: 500; }
.header-nav a.navlink:hover { background: var(--bg-soft); text-decoration: none; }
.header-nav a.navlink.active { color: var(--brand); font-weight: 600; }
.lang-switch { position: relative; margin-left: 10px; display: flex; align-items: center; gap: 4px; }
.lang-switch a { padding: 6px 11px; border-radius: 999px; font-size: .9rem; font-weight: 600; color: var(--muted); border: 1px solid var(--line); }
.lang-switch a.on { color: #fff; background: var(--brand); border-color: var(--brand); }
.menu-toggle { display: none; background: none; border: none; font-size: 1.5rem; cursor: pointer; margin-left: 4px; }
.menu-toggle span { width: 22px; height: 2px; background: var(--ink); display: block; margin: 5px 0; }

.mobile-nav { display: none; border-top: 1px solid var(--line); background: #fff; padding: 12px 24px 18px; }
.mobile-nav a { display: block; padding: 11px 4px; font-weight: 500; border-bottom: 1px solid var(--bg-soft); }
.mobile-nav a:last-child { border-bottom: none; }

/* ===== 按钮 ===== */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: .98rem;
  border: 1px solid transparent; cursor: pointer; transition: .18s;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-dark); text-decoration: none; color:#fff; }
.btn-ghost { background: transparent; color: var(--brand); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--brand); text-decoration: none; }
.btn-lg { padding: 14px 28px; font-size: 1.05rem; }
.btn-block { width: 100%; }

/* ===== 区块 ===== */
.section { padding: 72px 0; }
.section.soft { background: var(--bg-soft); }
.eyebrow { color: var(--brand); font-weight: 700; text-transform: uppercase; letter-spacing: .05em; font-size: .82rem; }
h1, h2, h3 { line-height: 1.25; }
.sec-title { font-size: clamp(1.7rem, 3.4vw, 2.5rem); font-weight: 800; margin: 10px 0 14px; }
.sec-sub { color: var(--muted); max-width: 720px; font-size: 1.05rem; }
.center { text-align: center; }
.center .sec-sub { margin-left: auto; margin-right: auto; }

/* ===== 首页 Hero ===== */
.hero { position: relative; background: linear-gradient(160deg, #eef4ff 0%, #ffffff 55%); padding: 96px 0 64px; overflow: hidden; }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.hero h1 { font-size: clamp(2rem, 4.6vw, 3.3rem); font-weight: 800; letter-spacing: -.01em; }
.hero h1 .grad { background: linear-gradient(90deg, var(--brand), #7c3aed); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p.lead { color: var(--muted); font-size: 1.15rem; margin: 18px 0 28px; }
.hero .cta-row { display: flex; gap: 12px; flex-wrap: wrap; }
.hero .points { margin: 26px 0 0; list-style: none; display: grid; gap: 8px; }
.hero .points li { color: var(--ink); display: flex; gap: 8px; align-items: center; }
.hero .points li::before { content: "✓"; color: var(--ok); font-weight: 800; }
.hero-visual {
  position: relative; border-radius: var(--radius); padding: 30px; background: #fff;
  box-shadow: var(--shadow); border: 1px solid var(--line);
}
.hero-visual .topbar { display:flex; gap:6px; margin-bottom:16px; }
.hero-visual .dot { width:11px; height:11px; border-radius:50%; background:#e6e9ef; }
.hero-visual .dot:nth-child(1){background:#fb7185}.hero-visual .dot:nth-child(2){background:#fbbf24}.hero-visual .dot:nth-child(3){background:#34d399}
.stat { display:flex; align-items:center; justify-content:space-between; padding:13px 16px; border:1px solid var(--line); border-radius:10px; margin-bottom:12px; background:var(--bg-soft); }
.stat .bar { height:9px; width:62%; border-radius:999px; background:#dbe3f6; overflow:hidden; }
.stat .fill { height:100%; width:72%; background:linear-gradient(90deg,var(--brand),#7c3aed); border-radius:999px; }

/* ===== Logo 带 / 信任条 ===== */
.trust { padding: 34px 0; border-bottom: 1px solid var(--line); }
.trust p { text-align:center; color: var(--muted); font-weight:600; font-size:.85rem; letter-spacing:.06em; }
.trust-logos { display:flex; flex-wrap:wrap; justify-content:center; gap:30px; margin-top:16px; }
.trust-logos span { font-weight:700; color:#98a2b3; font-size:1rem; }

/* ===== 特性卡片 ===== */
.grid3 { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:40px; }
.card { background:#fff; border:1px solid var(--line); border-radius: var(--radius); padding:26px; }
.card .ico { width:46px; height:46px; border-radius:11px; display:grid; place-items:center; font-size:1.4rem; background:var(--bg-soft); }
.card h3 { margin:16px 0 8px; font-size:1.12rem; }
.card p { color: var(--muted); font-size:.96rem; }
.grid2 { display:grid; grid-template-columns:repeat(2,1fr); gap:22px; }
.step { display:flex; gap:16px; margin-top:26px; }
.step .num { min-width:40px; height:40px; border-radius:50%; background:var(--brand); color:#fff; display:grid; place-items:center; font-weight:800; }

/* ===== 定价 ===== */
.plans { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-top:44px; align-items:stretch; }
.plan { border:1px solid var(--line); border-radius:var(--radius); padding:30px; background:#fff; display:flex; flex-direction:column; }
.plan.featured { border:2px solid var(--brand); box-shadow:var(--shadow); position:relative; }
.plan .tag { position:absolute; top:-13px; left:50%; transform:translateX(-50%); background:var(--brand); color:#fff; font-size:.75rem; font-weight:700; padding:4px 14px; border-radius:999px; }
.plan h3 { font-size:1.15rem; }
.plan .price { font-size:2.3rem; font-weight:800; margin:14px 0 4px; }
.plan .price small { font-size:.95rem; color:var(--muted); font-weight:500; }
.plan ul { list-style:none; margin:18px 0 26px; display:grid; gap:10px; }
.plan ul li { display:flex; gap:9px; color:var(--ink); font-size:.95rem; }
.plan ul li::before { content:"✓"; color:var(--ok); font-weight:800; }
.plan .btn { margin-top:auto; }

/* ===== 条款/表单页 ===== */
.legal { max-width: 860px; }
.legal h1 { font-size: clamp(1.7rem,3vw,2.2rem); font-weight:800; margin-bottom:6px; }
.legal .updated { color:var(--muted); font-size:.9rem; margin-bottom:26px; }
.legal h2 { font-size:1.3rem; margin:30px 0 10px; font-weight:700; }
.legal p { color:#2a2f3a; margin-bottom:12px; }
.legal ul, .legal ol { margin:0 0 14px 22px; color:#2a2f3a; }
.legal li { margin-bottom:6px; }

.form-card { background:#fff; border:1px solid var(--line); border-radius:var(--radius); padding:34px; box-shadow:var(--shadow); }
.form-card label { display:block; font-weight:600; margin:16px 0 6px; }
.form-card input, .form-card textarea, .form-card select {
  width:100%; padding:12px 14px; border:1px solid var(--line); border-radius:9px; font-size:1rem; font-family:inherit;
}
.form-card input:focus, .form-card textarea:focus { outline:none; border-color:var(--brand); }
.form-card textarea { min-height:140px; resize:vertical; }

/* ===== 联系信息 ===== */
.contact-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:22px; margin-bottom:46px; }
.contact-card { background:var(--bg-soft); border:1px solid var(--line); border-radius:var(--radius); padding:24px; text-align:center; }
.contact-card .ico { font-size:1.7rem; }
.contact-card h3 { margin:10px 0 6px; font-size:1.05rem; }
.contact-card a, .contact-card span { color:var(--ink); word-break:break-all; }

/* ===== 页脚 ===== */
.site-footer { background:#0f172a; color:#c6cdd8; padding:54px 0 30px; margin-top:20px; }
.footer-grid { display:grid; grid-template-columns:2fr 1fr 1fr 1fr; gap:32px; }
.site-footer h4 { color:#fff; margin-bottom:14px; font-size:1rem; }
.site-footer a { color:#c6cdd8; display:block; padding:5px 0; font-size:.94rem; }
.site-footer a:hover { color:#fff; text-decoration:none; }
.footer-brand { font-size:1.25rem; font-weight:800; color:#fff; margin-bottom:10px; }
.footer-legal { border-top:1px solid #1f2b40; margin-top:38px; padding-top:22px; font-size:.85rem; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px; }

.breadcrumbs { color: var(--muted); font-size: .9rem; margin: 26px 0 8px; }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs a:hover { color: var(--brand); }

/* ===== 响应式 ===== */
@media (max-width: 940px) {
  .hero-inner, .grid3, .plans, .contact-grid { grid-template-columns: 1fr; }
  .grid2 { grid-template-columns: 1fr; }
  .header-nav { display: none; }
  .menu-toggle { display: block; }
  .mobile-nav.open { display: block; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .hero { padding: 56px 0 40px; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-visual { padding: 20px; }
}