:root{
  --bg:#fff; --fg:#0f172a; --muted:#64748b; --line:#e5e7eb;
  --brand:#2563eb; --brand-dk:#1d4ed8; --brand-lt:#eff6ff;
  --dark:#0f172a; --radius:14px;
  --maxw:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",
  "Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--fg);
  line-height:1.7;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 顶部导航 ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.88);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;height:64px;gap:8px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:19px;
  color:var(--fg);text-decoration:none;letter-spacing:-.3px}
.logo:hover{text-decoration:none}
.logo svg{width:26px;height:26px;flex:none}
.navlinks{margin-left:auto;display:flex;align-items:center;gap:4px}
.navlinks a{padding:8px 13px;border-radius:8px;color:#334155;font-size:15px;
  font-weight:500;transition:.15s}
.navlinks a:hover{background:var(--brand-lt);color:var(--brand);text-decoration:none}
.navlinks a.active{color:var(--brand);background:var(--brand-lt)}
.navlinks a.cta{background:var(--brand);color:#fff;margin-left:8px}
.navlinks a.cta:hover{background:var(--brand-dk);color:#fff}
.burger{display:none;margin-left:auto;background:none;border:1px solid var(--line);
  border-radius:8px;width:40px;height:36px;cursor:pointer;padding:0}
.burger span{display:block;width:18px;height:2px;background:var(--fg);margin:4px auto;
  transition:.2s}

/* ---------- Hero ---------- */
.hero{background:linear-gradient(160deg,#0f172a 0%,#1e3a8a 60%,#1e40af 100%);
  color:#fff;padding:84px 0 92px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;inset:0;
  background:radial-gradient(900px 400px at 80% -10%,rgba(96,165,250,.28),transparent)}
.hero .wrap{position:relative;z-index:1}
.hero h1{font-size:46px;line-height:1.22;margin:0 0 18px;font-weight:800;
  letter-spacing:-1px}
.hero .lead{font-size:19px;color:#cbd5e1;margin:0 0 12px;max-width:660px}
.hero .sub{font-size:16px;color:#93c5fd;margin:0 0 34px}
.hero .badge{display:inline-block;background:rgba(255,255,255,.13);
  border:1px solid rgba(255,255,255,.24);padding:5px 14px;border-radius:999px;
  font-size:13px;color:#e0e7ff;margin-bottom:22px}
.hbtns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;
  border-radius:10px;font-weight:600;font-size:16px;transition:.15s;
  border:1.5px solid transparent;cursor:pointer}
.btn:hover{text-decoration:none;transform:translateY(-1px)}
.btn-p{background:#fff;color:var(--dark)}
.btn-p:hover{background:#f1f5f9;color:var(--dark)}
.btn-o{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-o:hover{background:rgba(255,255,255,.1);color:#fff}
.btn-b{background:var(--brand);color:#fff}
.btn-b:hover{background:var(--brand-dk);color:#fff}

/* ---------- 通用区块 ---------- */
.sec{padding:80px 0}
.sec.alt{background:#f8fafc}
.sec-h{text-align:center;max-width:680px;margin:0 auto 52px}
.sec-h h2{font-size:34px;margin:0 0 14px;font-weight:800;letter-spacing:-.6px}
.sec-h p{font-size:17px;color:var(--muted);margin:0}

/* ---------- 痛点 ---------- */
.pains{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.pain{background:#fff;border:1px solid var(--line);border-left:3px solid #f59e0b;
  border-radius:10px;padding:20px 22px;font-size:15.5px;color:#475569}
.pain b{color:#92400e;display:block;margin-bottom:5px;font-size:16px}

/* ---------- 功能卡 ---------- */
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px 26px;transition:.18s}
.card:hover{box-shadow:0 10px 30px rgba(15,23,42,.09);transform:translateY(-3px)}
.card .ico{font-size:30px;margin-bottom:14px;line-height:1}
.card h3{margin:0 0 10px;font-size:19px;font-weight:700}
.card p{margin:0;color:var(--muted);font-size:15px}

/* ---------- 截图 ---------- */
.shots{display:grid;grid-template-columns:1fr;gap:34px}
.shot{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  background:#fff;box-shadow:0 6px 24px rgba(15,23,42,.07)}
.shot img{width:100%;border-bottom:1px solid var(--line)}
.shot .cap{padding:14px 20px;font-size:14.5px;color:var(--muted);background:#fcfcfd}

/* ---------- 部署 ---------- */
.dgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.dcard{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;position:relative}
.dcard .tag{position:absolute;top:-11px;right:20px;background:var(--brand);color:#fff;
  font-size:12px;padding:3px 12px;border-radius:999px;font-weight:600}
.dcard h3{margin:0 0 10px;font-size:19px}
.dcard p{margin:0 0 14px;color:var(--muted);font-size:15px}
.dcard .time{font-size:13.5px;color:var(--brand);font-weight:600}

/* ---------- 价格 ---------- */
.pgrid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;align-items:start}
.plan{background:#fff;border:1.5px solid var(--line);border-radius:var(--radius);
  padding:28px 24px;display:flex;flex-direction:column;height:100%;
  position:relative;cursor:pointer;transition:border-color .18s,box-shadow .18s,
  transform .18s}
.plan:hover{border-color:#93c5fd;transform:translateY(-2px)}
/* ★ 徽章默认隐藏，只有被选中的卡片（.hot）才显示 —— 由 JS 移动 */
.ribbon{display:none}
.plan.hot .ribbon{display:block;position:absolute;top:-12px;left:50%;
  transform:translateX(-50%);background:var(--brand);color:#fff;font-size:12px;
  padding:4px 16px;border-radius:999px;font-weight:600;white-space:nowrap;
  box-shadow:0 3px 10px rgba(37,99,235,.32)}
.plan.hot{border-color:var(--brand);box-shadow:0 12px 34px rgba(37,99,235,.14)}
.plan.hot:hover{border-color:var(--brand-dk)}
.plan h3{margin:0 0 6px;font-size:19px}
.plan .note{font-size:13px;color:var(--muted);margin:0 0 18px;min-height:20px}
.plan .price{font-size:34px;font-weight:800;letter-spacing:-1px;margin:0}
.plan .price .u{font-size:15px;font-weight:500;color:var(--muted);letter-spacing:0}
.plan .dev{font-size:14px;color:var(--muted);margin:6px 0 20px}
.plan ul{list-style:none;margin:0 0 22px;padding:0;flex:1}
.plan li{padding:7px 0 7px 24px;position:relative;font-size:14.5px;color:#334155}
.plan li::before{content:"✓";position:absolute;left:0;color:#16a34a;font-weight:700}
.plan li.off{color:#94a3b8}
.plan li.off::before{content:"—";color:#cbd5e1}
.plan .pb{width:100%;text-align:center;padding:11px;border-radius:9px;
  border:1.5px solid var(--brand);background:#fff;color:var(--brand);
  font-weight:600;cursor:pointer;font-size:15px;transition:.15s}
.plan .pb:hover{background:var(--brand-lt)}
.plan.hot .pb{background:var(--brand);color:#fff}
.plan.hot .pb:hover{background:var(--brand-dk)}

/* ---------- FAQ 手风琴 ---------- */
.faq{max-width:820px;margin:0 auto}
.acc{border:1px solid var(--line);border-radius:10px;margin-bottom:12px;
  background:#fff;overflow:hidden}
.acc summary{padding:17px 20px;cursor:pointer;font-weight:600;font-size:16px;
  list-style:none;display:flex;align-items:center;gap:12px}
.acc summary::-webkit-details-marker{display:none}
.acc summary::after{content:"+";margin-left:auto;font-size:22px;color:var(--brand);
  font-weight:400;transition:.2s;line-height:1}
.acc[open] summary::after{content:"−"}
.acc .body{padding:0 20px 18px;color:var(--muted);font-size:15.5px}

/* ---------- 联系 / 表单 ---------- */
.contact{display:grid;grid-template-columns:1fr 1.15fr;gap:46px;align-items:start}
.cinfo h3{margin:0 0 8px;font-size:20px}
.cinfo p{margin:0 0 26px;color:var(--muted);font-size:15.5px}
.crow{display:flex;gap:12px;padding:11px 0;border-top:1px solid var(--line);
  font-size:15.5px}
.crow .k{color:var(--muted);min-width:64px;flex:none}
.crow .v{font-weight:600;word-break:break-all}
form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:28px}
.frow{margin-bottom:16px}
label{display:block;font-size:14px;font-weight:600;margin-bottom:7px;color:#334155}
input,select,textarea{width:100%;padding:11px 13px;border:1.5px solid var(--line);
  border-radius:9px;font-size:15px;font-family:inherit;transition:.15s;background:#fff}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--brand);
  box-shadow:0 0 0 3px rgba(37,99,235,.11)}
textarea{min-height:96px;resize:vertical}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.hint{font-size:13px;color:var(--muted);margin-top:8px}
.err{color:#dc2626;font-size:13.5px;margin-top:8px;display:none}
.err.show{display:block}
.okbox{display:none;background:#ecfdf5;border:1px solid #a7f3d0;color:#065f46;
  padding:14px 16px;border-radius:9px;font-size:14.5px;margin-top:14px}
.okbox.show{display:block}

/* ---------- 页脚 ---------- */
.footer{background:var(--dark);color:#94a3b8;padding:46px 0 30px;font-size:14.5px}
.footer .wrap{display:flex;flex-wrap:wrap;gap:26px;align-items:flex-start}
.footer .col{flex:1;min-width:180px}
.footer h4{color:#fff;font-size:15px;margin:0 0 12px;font-weight:600}
.footer a{color:#94a3b8}
.footer a:hover{color:#fff}
.footer .bot{border-top:1px solid #1e293b;margin-top:30px;padding-top:20px;
  font-size:13px;display:flex;justify-content:space-between;gap:14px;flex-wrap:wrap}

/* ---------- 提醒条 ---------- */
.todo{background:#fef3c7;border:1px solid #fcd34d;color:#92400e;
  padding:13px 18px;border-radius:10px;font-size:14.5px;margin-bottom:26px}
.todo b{display:block;margin-bottom:3px}

/* ---------- 响应式 ---------- */
@media(max-width:1000px){
  .grid3,.pgrid,.dgrid,.pains{grid-template-columns:repeat(2,1fr)}
  .pgrid{gap:16px}
}
@media(max-width:820px){
  .navlinks{display:none;position:absolute;top:64px;left:0;right:0;
    background:#fff;border-bottom:1px solid var(--line);flex-direction:column;
    align-items:stretch;padding:10px 16px 16px;gap:2px;
    box-shadow:0 12px 24px rgba(0,0,0,.08)}
  .navlinks.open{display:flex}
  .navlinks a{padding:11px 12px;font-size:16px}
  .navlinks a.cta{margin:8px 0 0;text-align:center}
  .burger{display:block}
  .contact{grid-template-columns:1fr;gap:32px}
  .hero{padding:56px 0 64px}
  .hero h1{font-size:33px}
  .hero .lead{font-size:17px}
  .sec{padding:56px 0}
  .sec-h h2{font-size:27px}
}
@media(max-width:600px){
  .grid3,.pgrid,.dgrid,.pains{grid-template-columns:1fr}
  .f2{grid-template-columns:1fr}
  .hero h1{font-size:28px}
  .plan .price{font-size:30px}
}