:root{
  --bg:#f6f8fc; --surface:#ffffff; --ink:#0f172a; --muted:#475569; --line:#e7ecf3;
  --pri:#2f5bea; --pri-d:#1d3fb0; --accent:#7c3aed; --teal:#0d9488; --orange:#d97706;
  --red:#dc2626; --green:#16a34a;
  --r:14px; --sh:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.06);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
.sm{font-size:13px}.muted{color:var(--muted)}
.center{text-align:center}
.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}
.skip-link{position:absolute;left:12px;top:-60px;z-index:300;background:var(--pri);color:#fff;padding:10px 16px;border-radius:10px;font-weight:600;transition:top .15s}
.skip-link:focus{top:12px}
.tag{display:inline-flex;align-items:center;gap:4px;font-size:11.5px;font-weight:600;padding:2px 8px;border-radius:999px;background:#eef2f7;color:#475569;white-space:nowrap}
.tag.green{background:#dcfce7;color:#15803d}.tag.red{background:#fee2e2;color:#b91c1c}
.tag.blue{background:#dbeafe;color:#1d4ed8}.tag.orange{background:#ffedd5;color:#c2410c}
.tag.purple{background:#ede9fe;color:#6d28d9}.tag.teal{background:#ccfbf1;color:#0f766e}.tag.gray{background:#eef2f7;color:#64748b}

/* Header */
header.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;height:62px;gap:18px}
.logo{font-weight:800;font-size:18px;display:flex;align-items:center;gap:9px}
.logo .dot{width:26px;height:26px;border-radius:8px;background:linear-gradient(135deg,var(--pri),var(--accent));color:#fff;display:grid;place-items:center;font-size:14px}
.nav nav{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav nav a{padding:8px 12px;border-radius:9px;font-size:14px;color:var(--muted);font-weight:600}
.nav nav a:hover{background:#eef2f7;color:var(--ink)}
.btn{border:1px solid var(--line);background:#fff;color:var(--ink);padding:10px 16px;border-radius:10px;font-weight:600;cursor:pointer;font-size:14px;transition:.15s}
.btn:hover{box-shadow:var(--sh)}
.btn.primary{background:var(--pri);border-color:var(--pri);color:#fff}
.btn.primary:hover{background:var(--pri-d)}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.6;cursor:default}
.btn.lg{padding:13px 26px;font-size:15px}
.btn.sm{padding:7px 12px;font-size:13px}
.btn.danger{color:var(--red);border-color:#fecaca}
.btn.xs{padding:4px 9px;font-size:12px;border-radius:8px}

/* Hero */
.hero{position:relative;overflow:hidden;background:linear-gradient(160deg,#eef3ff 0%,#f6f8fc 55%,#fbf7ff 100%);border-bottom:1px solid var(--line)}
.hero .wrap{padding:72px 20px 64px;display:grid;grid-template-columns:1.1fr .9fr;gap:36px;align-items:center}
.hero h1{font-size:42px;line-height:1.15;margin:0 0 16px;letter-spacing:-.5px}
.hero h1 .hl{background:linear-gradient(120deg,var(--pri),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{font-size:17px;color:var(--muted);margin:0 0 26px;max-width:520px}
.hero .cta{display:flex;gap:12px;flex-wrap:wrap}
.hero .card{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh);padding:22px}
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:16px;text-align:center}
.stat .n{font-size:30px;font-weight:800;background:linear-gradient(120deg,var(--pri),var(--accent));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .l{font-size:13px;color:var(--muted)}
.engines{margin-top:18px;display:flex;flex-wrap:wrap;gap:8px}

/* Sections */
section.block{padding:64px 0}
section.block h2{font-size:28px;margin:0 0 6px;letter-spacing:-.3px}
section.block .sub{color:var(--muted);margin:0 0 28px;font-size:15px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh)}
.grid{display:grid;gap:16px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:860px){.hero .wrap{grid-template-columns:1fr;padding-top:48px}.g2,.g3,.g4{grid-template-columns:1fr}.stats{grid-template-columns:repeat(2,1fr)}}

/* Tool panels */
.tool{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--sh);padding:24px}
.tool h3{margin:0 0 4px;font-size:19px}
.tool .hint{color:var(--muted);font-size:13px;margin:0 0 14px}
textarea.ta,input.in{width:100%;border:1px solid var(--line);border-radius:11px;padding:12px 14px;font-size:14px;font-family:inherit;background:#fbfcfe;color:var(--ink);resize:vertical}
textarea.ta:focus,input.in:focus{outline:none;border-color:var(--pri);background:#fff;box-shadow:0 0 0 3px rgba(47,91,234,.12)}
/* GEO 扫描子栏目导航与表单 */
.subnav{display:flex;gap:8px;margin-bottom:18px;flex-wrap:wrap}
.subnav button{border:1px solid var(--line);background:#fff;color:var(--muted);padding:9px 16px;border-radius:999px;font-size:14px;font-weight:600;cursor:pointer;transition:.15s}
.subnav button:hover{border-color:var(--pri);color:var(--pri)}
.subnav button.active{background:var(--pri);border-color:var(--pri);color:#fff}
.inp{flex:1;min-width:0;width:100%;border:1px solid var(--line);border-radius:11px;padding:12px 14px;font-size:14px;font-family:inherit;background:#fbfcfe;color:var(--ink)}
.inp:focus{outline:none;border-color:var(--pri);background:#fff;box-shadow:0 0 0 3px rgba(47,91,234,.12)}
.flex1{flex:1;min-width:0}
.chk-list{display:flex;flex-direction:column;gap:8px}
.chk{display:flex;gap:10px;align-items:flex-start;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fbfcfe}
.chk .ix{width:22px;height:22px;flex:none;border-radius:6px;background:#eef2f7;color:#475569;font-size:12px;font-weight:700;display:flex;align-items:center;justify-content:center}
.chk.ok{border-color:#bbf7d0;background:#f0fdf4}.chk.ok .ix{background:#dcfce7;color:#15803d}
.chk.no{border-color:#fecaca;background:#fef2f2}.chk.no .ix{background:#fee2e2;color:#b91c1c}
.chk .ct{flex:1;min-width:0}
.chk .ct .quote{margin-top:2px}
.chk .tag{margin-left:auto;flex:none}
.plan{margin:0;padding-left:18px}
.plan li{font-size:13px;margin:5px 0;color:#334155}
.samples{display:flex;gap:8px;margin-top:10px;flex-wrap:wrap}
.row{display:flex;gap:10px;align-items:center}
.right{margin-left:auto}
.result{margin-top:20px;display:none}
.result.show{display:block;animation:fade .3s ease}
@keyframes fade{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* Tables */
.tb-wrap{overflow:auto;border-radius:12px;border:1px solid var(--line)}
table.tb{width:100%;border-collapse:collapse;font-size:14px;background:#fff}
.tb th,.tb td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line);white-space:nowrap}
.tb th{background:#f8fafc;font-size:12.5px;color:var(--muted);font-weight:700;position:sticky;top:0}
.tb tbody tr:hover{background:#fafbff}
.tb tr.self{background:#eef4ff}
.tb tr.self:hover{background:#e6efff}
.rank-pos{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:8px;font-weight:800;font-size:13px;background:#eef2f7;color:#475569}
.rank-pos.top{background:linear-gradient(135deg,var(--pri),var(--accent));color:#fff}

/* Gauges & charts */
.gauge-wrap{display:inline-block}
.bars .bar-row{display:flex;align-items:center;gap:10px;margin:7px 0}
.bars .nm{width:120px;font-size:13px;color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.bars .tr{flex:1;height:10px;background:#eef2f7;border-radius:6px;overflow:hidden}
.bars .tr i{display:block;height:100%;border-radius:6px;background:var(--pri)}
.bars .vl{width:54px;text-align:right;font-size:13px;font-weight:700}
.mini-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px}
.mini{background:#f8fafc;border:1px solid var(--line);border-radius:11px;padding:12px;text-align:center}
.mini .v{font-size:22px;font-weight:800}.mini .l{font-size:12px;color:var(--muted)}
.finding{border:1px solid var(--line);border-radius:11px;padding:12px 14px;margin-bottom:10px;background:#fff}
.finding .ft{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin-bottom:6px}
.finding .ft .ml{margin-left:auto}
.callout{border-radius:11px;padding:12px 14px;font-size:14px;background:#eff6ff;color:#1e3a8a;border:1px solid #dbeafe}
.callout.ok{background:#f0fdf4;color:#166534;border-color:#bbf7d0}
.callout.warn{background:#fffbeb;color:#92400e;border-color:#fde68a}
.callout.danger{background:#fef2f2;color:#991b1b;border-color:#fecaca}
.quote{color:var(--muted);font-size:12.5px}

/* FAQ */
.faq{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin-bottom:10px;background:#fff;cursor:pointer}
.faq .q{font-weight:700;display:flex;gap:8px;align-items:center}
.faq .q .ar{margin-left:auto;transition:.2s;color:var(--muted)}
.faq.open .q .ar{transform:rotate(90deg)}
.faq .a{display:none;color:var(--muted);font-size:14px;margin-top:8px}
.faq.open .a{display:block}
footer{background:#0f172a;color:#cbd5e1;padding:40px 0;margin-top:40px}
footer .wrap{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
footer a{color:#93c5fd}
footer .mono{font-size:12px;color:#64748b}
.pill{display:inline-block;background:#eef2f7;border-radius:999px;padding:3px 10px;font-size:12px;color:#475569;margin:2px}
.skeleton{height:14px;border-radius:7px;background:linear-gradient(90deg,#eef2f7 25%,#e2e8f0 37%,#eef2f7 63%);background-size:400% 100%;animation:sk 1.2s ease infinite;margin:8px 0}
@keyframes sk{0%{background-position:100% 0}100%{background-position:-100% 0}}

/* ---------- 会员套餐卡片 ---------- */
.price{position:relative;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:26px 22px;display:flex;flex-direction:column;box-shadow:var(--sh)}
.price.hot{border-color:var(--pri);box-shadow:0 10px 30px rgba(47,91,234,.18)}
.price .ribbon{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:linear-gradient(135deg,var(--pri),var(--accent));color:#fff;font-size:12px;font-weight:700;padding:4px 14px;border-radius:999px;white-space:nowrap}
.price h3{margin:0 0 2px;font-size:20px}
.price .tl{color:var(--muted);font-size:13px;margin-bottom:10px}
.price .pv{display:flex;align-items:baseline;gap:4px;margin:6px 0 2px}
.price .pv b{font-size:34px;font-weight:800}
.price .pv .per{color:var(--muted);font-size:13px}
.price .yr{color:var(--green);font-size:12px;font-weight:600;margin-bottom:14px}
.price ul{list-style:none;padding:0;margin:0 0 18px;flex:1}
.price li{padding:7px 0 7px 24px;position:relative;font-size:13.5px;border-top:1px dashed var(--line)}
.price li:first-child{border-top:none}
.price li:before{content:"✓";position:absolute;left:0;top:7px;color:var(--green);font-weight:800}
.price .btn{width:100%;justify-content:center;display:flex}

/* ---------- 登录/注册弹窗 ---------- */
.mask{position:fixed;inset:0;background:rgba(15,23,42,.45);display:grid;place-items:center;z-index:200;padding:16px}
.modal{background:#fff;border-radius:16px;box-shadow:0 20px 60px rgba(0,0,0,.25);max-width:420px;width:100%;padding:26px;position:relative}
.auth-card .x{position:absolute;top:12px;right:14px;border:none;background:none;font-size:24px;color:var(--muted);cursor:pointer;line-height:1}
.auth-card .tabs{display:flex;gap:6px;background:#f1f5f9;padding:4px;border-radius:10px;margin-bottom:18px}
.auth-card .tabs button{flex:1;border:none;background:none;padding:9px;border-radius:8px;font-weight:700;cursor:pointer;color:var(--muted);font-size:14px}
.auth-card .tabs button.active{background:#fff;color:var(--pri);box-shadow:var(--sh)}
.auth-form{display:flex;flex-direction:column;gap:12px}
.auth-form input{padding:12px 14px;border:1px solid var(--line);border-radius:10px;font-size:14px;outline:none}
.auth-form input:focus{border-color:var(--pri);box-shadow:0 0 0 3px rgba(47,91,234,.15);outline:none}
.auth-hint{font-size:12.5px;color:var(--muted);line-height:1.5}
.auth-msg{margin-top:12px;font-size:13px;font-weight:600;min-height:18px}
.auth-msg.err{color:var(--red)}.auth-msg.ok{color:var(--green)}

/* 已登录态 nav */
.nav .user{display:flex;align-items:center;gap:8px;margin-left:8px}
.nav .user .av{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--pri),var(--accent));color:#fff;display:grid;place-items:center;font-weight:800;font-size:13px}
.nav .user .em{font-size:13px;font-weight:600;max-width:140px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
@media(max-width:640px){.nav .user .em{display:none}}

/* ===== 提质增强 ===== */
/* 区块标题小标 */
.eyebrow{display:inline-block;font-size:12.5px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--pri);background:#eef2ff;padding:5px 12px;border-radius:999px;margin-bottom:14px}
section.block{padding:72px 0}
section.block h2{position:relative}

/* 价值条 */
.values{background:linear-gradient(180deg,#fff,#f6f8fc);border-bottom:1px solid var(--line)}
.values .vrow{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;padding:28px 0}
.values .vi{display:flex;gap:12px;align-items:flex-start;padding:14px 16px;border-radius:14px;background:#fff;border:1px solid var(--line);box-shadow:var(--sh)}
.values .vic{width:38px;height:38px;flex:none;border-radius:10px;display:grid;place-items:center;font-size:18px;background:linear-gradient(135deg,var(--pri),var(--accent));color:#fff}
.values .vi b{font-size:14.5px}
.values .vi p{margin:3px 0 0;font-size:12.5px;color:var(--muted);line-height:1.45}
@media(max-width:860px){.values .vrow{grid-template-columns:repeat(2,1fr)}}
@media(max-width:480px){.values .vrow{grid-template-columns:1fr}}

/* 商务合作卡片 */
.sales-card{max-width:760px;margin:0 auto;padding:26px;text-align:left}
.sales-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.sales-item{background:#f8fafc;border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.sales-item .si-l{font-size:12px;color:var(--muted);margin-bottom:4px;font-weight:600}
.sales-item .si-v{font-size:16px;font-weight:800;color:var(--ink);word-break:break-all}
.sales-qr{margin:18px auto 0;text-align:center}
@media(max-width:640px){.sales-grid{grid-template-columns:1fr}}

/* 页脚联系 */
.foot-contact{width:100%;margin-top:16px;padding-top:14px;border-top:1px solid rgba(255,255,255,.12);color:#94a3b8;font-size:13px;display:flex;gap:16px;flex-wrap:wrap}

/* 导航激活态 + 悬浮 */
.nav nav a.active{background:#eef2ff;color:var(--pri)}
.nav .btn.primary{box-shadow:none}

/* 定价卡悬浮 */
.price{transition:transform .18s, box-shadow .18s}
.price:hover{transform:translateY(-4px);box-shadow:0 16px 40px rgba(47,91,234,.16)}
.price ul li{color:#334155}

/* 英雄区装饰 */
.hero{background:radial-gradient(1200px 400px at 80% -10%,rgba(124,58,237,.10),transparent),linear-gradient(160deg,#eef3ff 0%,#f6f8fc 55%,#fbf7ff 100%)}
.hero h1{font-size:46px}
.block .card{transition:box-shadow .18s}
@media(max-width:860px){.hero h1{font-size:34px}}

/* ---------------- 首页广告位（菜单下方） ---------------- */
.ads-banner{background:#f6f8fc;border-bottom:1px solid var(--line)}
.ads-banner .wrap{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:12px 20px}
.ads-banner .ad-slot{display:block;min-height:96px}
.ads-banner .ad-link{display:block;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:#fff;box-shadow:0 1px 3px rgba(15,23,42,.06);transition:box-shadow .15s,transform .15s}
.ads-banner .ad-link:hover{box-shadow:var(--sh);transform:translateY(-1px)}
.ads-banner .ad-link img{display:block;width:100%;height:140px;object-fit:cover}
.ads-banner .ad-placeholder{display:flex;align-items:center;justify-content:center;height:140px;border:1.5px dashed #d6deea;border-radius:12px;color:#94a3b8;font-size:13px;background:#fafcff}
@media(max-width:640px){
  .ads-banner .wrap{grid-template-columns:1fr}
  .ads-banner .ad-link img{height:120px}
}

/* 无障碍：尊重「减少动效」系统偏好 */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
}