:root{
  --ink:#0A1124; --ink2:#0E1832; --ink3:#16224A;
  --brand:#2E63FF; --brand-d:#1E47D6; --cyan:#12C2E0; --cyan-d:#0A9EBC;
  --bg:#fff; --soft:#F4F7FC; --soft2:#EEF3FB; --line:#E4EAF5;
  --text:#0D1730; --muted:#5B6B87; --faint:#8A98B3;
  --ok:#12B76A; --warn:#F59E0B; --danger:#F04438;
  --r-lg:22px; --r-md:16px; --shadow:0 18px 50px -20px rgba(16,42,98,.28);
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;
  --serif:"Songti SC","STSong","Noto Serif SC",serif;
  --num:"DIN Alternate","Bahnschrift","Segoe UI",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;display:flex;flex-direction:column;min-height:100vh}
a{text-decoration:none;color:inherit}
img{display:block;max-width:100%}
.wrap{max-width:1180px;margin:0 auto;padding:0 28px}
.sec{padding:88px 0}
.kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.16em;color:var(--brand)}
.kicker::before{content:"";width:22px;height:2px;background:linear-gradient(90deg,var(--brand),var(--cyan));border-radius:2px}
.kicker.c{color:var(--cyan-d)}
h2.sec-t{font-size:clamp(27px,3.4vw,38px);font-weight:800;letter-spacing:-.01em;line-height:1.25;margin:13px 0 13px}
.lead{color:var(--muted);font-size:16px;max-width:640px}
.center{text-align:center}
.center .lead,.center h2.sec-t{margin-left:auto;margin-right:auto}
.center .kicker{justify-content:center}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}

.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:999px;font-weight:700;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.25s;white-space:nowrap}
.btn-p{background:linear-gradient(120deg,var(--brand),var(--cyan));color:#fff;box-shadow:0 12px 26px-10px rgba(46,99,255,.6)}
.btn-p:hover{transform:translateY(-2px);box-shadow:0 18px 34px -10px rgba(46,99,255,.7)}
.btn-g{background:rgba(255,255,255,.08);color:#fff;border-color:rgba(255,255,255,.28)}
.btn-g:hover{background:rgba(255,255,255,.16)}
.btn-o{background:#fff;color:var(--brand);border-color:var(--line)}
.btn-o:hover{border-color:var(--brand);color:var(--brand-d)}
.btn-sm{padding:9px 18px;font-size:14px}
.tag-demo{display:inline-block;font-size:12px;font-weight:700;color:var(--warn);background:#FFF6E5;border:1px solid #FBE0A8;border-radius:999px;padding:3px 12px}

/* ===== nav ===== */
.nav{position:fixed;top:0;left:0;right:0;z-index:100;color:#fff;transition:.3s}
.nav-topline{height:3px;background:linear-gradient(90deg,var(--brand),var(--cyan) 55%,transparent)}
.nav-in{display:flex;align-items:center;gap:28px;padding:15px 28px;max-width:1240px;margin:0 auto;transition:.3s}
.nav.solid{background:rgba(255,255,255,.9);backdrop-filter:blur(16px);box-shadow:0 1px 0 var(--line);color:var(--text)}
.nav.dark{background:rgba(9,15,33,.86);backdrop-filter:blur(16px);box-shadow:0 1px 0 rgba(255,255,255,.07);color:#fff}
/* 锁色防护：即便 solid/dark 被同时误加，首页仍固定深色、不跳白底 */
.nav.dark.solid{background:rgba(9,15,33,.86);backdrop-filter:blur(16px);box-shadow:0 1px 0 rgba(255,255,255,.07);color:#fff}
.nav.dark .logo small{color:var(--cyan)}
.nav.solid .nav-in{padding-top:10px;padding-bottom:10px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:17px;white-space:nowrap}
.logo img{width:36px;height:36px;border-radius:9px}
.logo small{display:block;font-size:9.5px;font-weight:700;letter-spacing:.12em;color:var(--cyan);line-height:1.2;margin-top:1px}
.nav.solid .logo small{color:var(--brand)}
.nav-links{display:flex;gap:30px;margin-left:10px}
.nav-links a{font-size:15px;font-weight:600;opacity:.82;position:relative;padding:4px 0}
.nav-links a::after{content:"";position:absolute;left:0;bottom:-2px;width:0;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--brand),var(--cyan));transition:.25s}
.nav-links a:hover,.nav-links a.active{opacity:1}
.nav-links a:hover::after,.nav-links a.active::after{width:100%}
.nav-cta{margin-left:auto;display:flex;align-items:center;gap:12px}
.login-l{font-weight:600;font-size:15px;opacity:.82}
.login-l:hover{opacity:1}
.menu-btn{display:none;background:none;border:0;font-size:24px;color:inherit;cursor:pointer}

/* ===== hero ===== */
.hero{position:relative;background:radial-gradient(1100px 540px at 78% -15%,#1C3372 0%,var(--ink) 56%),var(--ink);color:#fff;padding:160px 0 100px;overflow:hidden;min-height:92vh;display:flex;align-items:center}
.hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);background-size:54px 54px;-webkit-mask-image:radial-gradient(900px 620px at 70% 20%,#000,transparent 78%);mask-image:radial-gradient(900px 620px at 70% 20%,#000,transparent 78%)}
.hero .wrap{position:relative;width:100%}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:54px;align-items:center}
.hero h1{font-size:clamp(33px,4.6vw,54px);line-height:1.16;font-weight:800;letter-spacing:-.01em;margin:18px 0 20px}
.hl{background:linear-gradient(100deg,var(--cyan),#84E7F7);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero .sub{font-size:17px;color:#AEBBDA;max-width:520px}
.hero-actions{display:flex;gap:14px;margin:32px 0 24px;flex-wrap:wrap}
.hero-trust{display:flex;gap:22px;font-size:13.5px;color:#93A2C6;flex-wrap:wrap}
.hero-trust span{display:inline-flex;align-items:center;gap:7px}
.dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.ai-card{background:linear-gradient(160deg,#16224A,#0F1834);border:1px solid rgba(255,255,255,.1);border-radius:var(--r-lg);padding:24px;box-shadow:var(--shadow)}
.ai-card .q{font-size:14px;color:#C6D1EA;font-weight:600;padding-bottom:15px;border-bottom:1px dashed rgba(255,255,255,.14)}
.ai-h{display:flex;align-items:center;gap:9px;font-size:12.5px;color:#8FA0C8;margin:15px 0 12px;font-weight:700;letter-spacing:.06em}
.ai-h .b{width:20px;height:20px;border-radius:6px;background:linear-gradient(135deg,var(--brand),var(--cyan))}
.rank{display:flex;flex-direction:column;gap:10px}
.rank li{list-style:none;display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:12px;padding:11px 14px;font-size:14.5px;color:#D6DEF2}
.rank li.me{background:linear-gradient(120deg,rgba(46,99,255,.28),rgba(18,194,224,.14));border-color:rgba(90,160,255,.5)}
.rank .no{width:24px;height:24px;border-radius:8px;display:grid;place-items:center;font-size:12.5px;font-weight:800;background:rgba(255,255,255,.12);color:#CEDAFA;font-family:var(--num)}
.rank li.me .no{background:linear-gradient(135deg,var(--brand),var(--cyan));color:#fff}
.cite{margin-left:auto;display:flex;gap:5px}
.cite i{font-style:normal;font-size:11px;font-weight:800;color:#0A1124;background:#8FE6F5;border-radius:5px;padding:1px 6px;font-family:var(--num)}
.ai-card .note{margin-top:13px;font-size:12px;color:var(--faint)}

/* engine strip (home) */
.eng-strip{display:flex;justify-content:center;gap:30px;flex-wrap:wrap;margin-top:8px}
.eng-strip .e{text-align:center}
.eng-strip img{width:54px;height:54px;border-radius:14px;object-fit:cover;margin:0 auto 8px;box-shadow:0 8px 18px -12px rgba(16,42,98,.5)}
.eng-strip span{font-size:12.5px;color:var(--muted)}
.eng-more{margin-top:26px;text-align:center;font-size:14px;color:var(--muted)}
.eng-more b{color:var(--brand-d)}
.eng-note{margin-top:14px;text-align:center;font-size:11px;line-height:1.6;color:var(--muted)}

/* three pillars */
.pillar{border:1px solid var(--line);border-radius:var(--r-lg);padding:34px 28px;background:#fff;transition:.28s;position:relative;overflow:hidden}
.pillar::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand),var(--cyan));transform:scaleX(0);transform-origin:left;transition:.3s}
.pillar:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.pillar:hover::before{transform:scaleX(1)}
.pillar .pn{font-family:var(--num);font-size:15px;font-weight:800;color:var(--brand);letter-spacing:.1em}
.pillar .ic{font-size:30px;margin:12px 0}
.pillar h3{font-size:21px;margin-bottom:10px}
.pillar p{color:var(--muted);font-size:14.5px}
.pillar ul{list-style:none;margin-top:14px;font-size:13.5px;color:var(--muted);display:flex;flex-direction:column;gap:7px}
.pillar li::before{content:"— ";color:var(--brand);font-weight:700}

/* subpage hero */
.page-hero{background:radial-gradient(900px 400px at 50% -30%,#1C3372,var(--ink));color:#fff;padding:150px 0 70px;text-align:center}
.page-hero h1{font-size:clamp(30px,4.2vw,46px);font-weight:800;margin:14px 0 14px}
.page-hero p{color:#AEBBDA;max-width:620px;margin:0 auto}
.page-hero .kicker{color:var(--cyan);justify-content:center}
.page-hero .kicker::before{display:none}

/* generic cards */
.card{border:1px solid var(--line);border-radius:var(--r-md);padding:26px;background:#fff;transition:.28s}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .ic{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;font-size:21px;background:var(--soft2);color:var(--brand);margin-bottom:14px}
.card h3{font-size:18px;margin-bottom:8px}
.card p,.card li{font-size:14px;color:var(--muted)}
.card ul{list-style:none;display:flex;flex-direction:column;gap:7px;margin-top:10px}
.card li::before{content:"✓ ";color:var(--ok);font-weight:800}
.risk-q{margin:12px 0 10px;padding:13px 15px;border-left:3px solid var(--danger);border-radius:0 10px 10px 0;background:var(--soft);font-size:13.5px;line-height:1.8;color:var(--muted)}
.soft-band{background:var(--soft)}
.dark-band{background:linear-gradient(165deg,#0C1730,#0A1226);color:#fff}
.dark-band h2.sec-t{color:#fff}
.dark-band .lead{color:#AEBBDA}

/* steps */
.step-n{display:flex;flex-direction:column;align-items:flex-start}
.step-n .num{width:52px;height:52px;border-radius:50%;background:linear-gradient(135deg,var(--brand),var(--cyan));color:#fff;font-family:var(--num);font-size:22px;font-weight:800;display:grid;place-items:center;margin-bottom:16px;box-shadow:0 10px 22px -8px rgba(46,99,255,.6)}
.step-n h3{font-size:18px;margin-bottom:8px}
.step-n p{font-size:14px;color:var(--muted)}
.timeline{position:relative;padding-left:30px;max-width:560px}
.timeline::before{content:"";position:absolute;left:9px;top:6px;bottom:6px;width:2px;background:linear-gradient(180deg,var(--brand),var(--cyan))}
.tl{position:relative;padding-bottom:24px}
.tl:last-child{padding-bottom:0}
.tl::before{content:"";position:absolute;left:-26px;top:5px;width:13px;height:13px;border-radius:50%;background:var(--cyan);box-shadow:0 0 0 4px rgba(18,194,224,.18)}
.tl b{display:block;font-size:15.5px}
.tl span{font-size:13.5px;color:var(--muted)}

/* eeat */
.eeat-vs{display:grid;grid-template-columns:1fr 1fr;gap:22px;max-width:900px;margin:30px auto 0}
.vsbox{border-radius:var(--r-md);padding:26px}
.vsbox.good{background:#ECF9F2;border:1px solid #BEEACF}
.vsbox.bad{background:#FBF0EF;border:1px solid #F3CFC9}
.vsbox h4{font-size:15px;margin-bottom:10px}
.vsbox.good h4{color:#0B8A4E}.vsbox.bad h4{color:#C0392B}
.vsbox p{font-family:var(--serif);font-size:15px;line-height:1.8;color:#374461}

/* table */
.tbl{width:100%;border-collapse:separate;border-spacing:0;border-radius:var(--r-md);overflow:hidden;box-shadow:0 10px 40px -22px rgba(16,42,98,.4);font-size:15px}
.tbl th,.tbl td{padding:15px 16px;text-align:center;border-bottom:1px solid var(--line)}
.tbl thead th{background:var(--ink);color:#fff}
.tbl thead th.hl-col{background:linear-gradient(160deg,#1E316B,#16234D)}
.tbl tbody td:first-child{text-align:left;font-weight:600;background:var(--soft)}
.tbl tbody tr:nth-child(even) td:not(:first-child){background:#FBFCFE}
.tbl .hl-col{background:#F2F6FF;font-weight:700;color:var(--brand-d)}
.yes{color:var(--ok);font-weight:800}
.no{color:var(--danger);font-weight:800}
.part{color:var(--warn);font-weight:700;font-size:13.5px}

/* pricing */
.price-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;align-items:stretch}
.price{border:1px solid var(--line);border-radius:var(--r-lg);padding:32px 28px;background:#fff;display:flex;flex-direction:column;position:relative}
.price.pop{border-color:var(--brand);box-shadow:var(--shadow);transform:translateY(-8px)}
.price .badge{position:absolute;top:-13px;left:50%;transform:translateX(-50%);background:linear-gradient(120deg,var(--brand),var(--cyan));color:#fff;font-size:12px;font-weight:700;border-radius:999px;padding:4px 15px;white-space:nowrap}
.price h3{font-size:19px}
.price .psub{font-size:13px;color:var(--muted);margin-bottom:18px}
.amt{font-family:var(--num);font-size:40px;font-weight:800;line-height:1}
.amt small{font-size:14px;color:var(--muted);font-weight:600;font-family:var(--sans)}
.price ul{list-style:none;margin:22px 0;flex:1;display:flex;flex-direction:column;gap:11px;font-size:14px;color:#374461}
.price li::before{content:"✓";color:var(--ok);font-weight:800;margin-right:9px}
.price-notes{margin-top:32px;text-align:center;font-size:13.5px;color:var(--muted)}
.price-notes b{color:var(--brand-d)}
.bill-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);box-shadow:var(--shadow);padding:28px;position:relative;max-width:420px}
.bill-card .hd{position:absolute;top:-13px;right:24px;background:#FEF3D6;color:#B45309;font-size:12px;font-weight:700;border:1px solid #F3D89A;border-radius:999px;padding:4px 13px}
.bill-card h3{font-size:17px;margin-bottom:16px}
.bill-line{display:flex;justify-content:space-between;font-size:14.5px;padding:12px 0;border-bottom:1px dashed var(--line)}
.bill-line b{font-family:var(--num)}
.bill-total{display:flex;justify-content:space-between;align-items:center;padding:16px 0 4px}
.bill-total b{font-family:var(--num);font-size:30px;color:var(--brand)}
.bill-card .foot{margin-top:12px;background:var(--soft);border-radius:11px;padding:12px 14px;font-size:12.5px;color:var(--muted)}

/* faq */
.faq{max-width:820px;margin:0 auto}
details{border:1px solid var(--line);border-radius:13px;margin-bottom:14px;background:#fff}
summary{list-style:none;cursor:pointer;padding:19px 24px;font-weight:700;font-size:16px;display:flex;justify-content:space-between;align-items:center}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:400;transition:.25s}
details[open] summary::after{transform:rotate(45deg)}
details p{padding:0 24px 19px;color:var(--muted);font-size:14.5px}

/* final cta */
.final{background:radial-gradient(820px 380px at 50% -20%,#243A78,var(--ink));color:#fff;text-align:center;padding:92px 0}
.final h2{font-size:clamp(27px,3.8vw,40px);font-weight:800;margin-bottom:13px}
.final p{color:#AEBBDA;max-width:560px;margin:0 auto 30px}

/* footer */
footer{background:#070C1C;color:#93A2C6;padding:58px 0 32px;font-size:14px;margin-top:auto}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:34px;margin-bottom:38px}
.foot-brand{display:flex;align-items:center;gap:11px;color:#fff;font-weight:800;font-size:17px;margin-bottom:14px}
.foot-brand img{width:34px;height:34px;border-radius:8px}
footer h5{color:#fff;font-size:14px;margin-bottom:13px}
footer ul{list-style:none;display:flex;flex-direction:column;gap:9px}
footer a:hover{color:#fff}
.foot-bot{border-top:1px solid rgba(255,255,255,.09);padding-top:22px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:13px}
.foot-bot a:hover{color:#fff}
.police{display:inline-flex;align-items:center;gap:6px}
.police .shield{width:14px;height:14px;border-radius:3px;background:linear-gradient(135deg,#2E63FF,#12C2E0);display:inline-block}

.rv{opacity:0;transform:translateY(24px);transition:.7s cubic-bezier(.2,.7,.2,1)}
.rv.in{opacity:1;transform:none}

@media(max-width:980px){
  .hero{min-height:auto}
  .hero-grid{grid-template-columns:1fr;gap:42px}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3,.price-grid,.eeat-vs{grid-template-columns:1fr}
  .price.pop{transform:none}
  .foot-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;color:var(--text);flex-direction:column;gap:0;padding:8px 20px 16px;box-shadow:0 16px 30px -18px rgba(16,42,98,.4)}
  .nav-links.open{display:flex}
  .nav-links a{padding:13px 4px;border-bottom:1px solid var(--line)}
  .menu-btn{display:block;margin-left:auto}
  .nav-cta{margin-left:0}
}
@media(max-width:560px){
  .wrap{padding:0 18px}
  .sec{padding:64px 0}
  .grid-4{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr}
  .nav-cta .login-l{display:none}
  .hero{padding:130px 0 70px}
  .tbl{font-size:13px}.tbl th,.tbl td{padding:10px 8px}
}

/* ===== 实测案例页 ===== */
.demo-tag{display:inline-block;background:#FFF4E5;color:#B54708;border:1px solid #FEDF89;border-radius:999px;padding:6px 14px;font-size:12.5px;font-weight:700}
.score-rows{display:flex;flex-direction:column;gap:13px;margin:20px 0}
.sr{display:grid;grid-template-columns:108px 1fr 44px;align-items:center;gap:12px;font-size:13.5px}
.sr>span{color:var(--muted)}
.sr>b{text-align:right;font-family:var(--num);color:var(--brand-d)}
.bar{height:8px;border-radius:99px;background:#EAF0FA;overflow:hidden}
.bar>i{display:block;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--brand),var(--cyan))}
.cap{font-size:12px;color:var(--faint);margin:8px 0 0}
.rquote{margin-top:14px;background:var(--soft);border-left:3px solid var(--cyan);border-radius:8px;padding:11px 13px;font-size:12.5px;color:var(--muted);line-height:1.7}
.rquote small{display:block;margin-top:6px;color:var(--faint);font-size:11px}
.risk-card .ic{font-size:26px}
.ai-card .ai-q{font-size:13.5px;color:#C6D1EA;font-weight:600;padding-bottom:14px;border-bottom:1px dashed rgba(255,255,255,.15);margin-bottom:14px}
.rrow{display:flex;align-items:center;gap:12px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.08);border-radius:var(--r-sm);padding:11px 13px}
.rrow .ridx{width:26px;height:26px;flex:none;border-radius:8px;display:grid;place-items:center;font-size:12.5px;font-weight:700;background:rgba(255,255,255,.12);color:#DCE6FF;font-family:var(--num)}
.rrow .rname{flex:1;font-size:14px;color:#EAF0FF;font-weight:600}
.rrow .rname sup{color:var(--cyan);font-size:10px}
.rrow .rtag{font-size:11px;font-weight:700;color:#fff;background:linear-gradient(130deg,var(--brand),var(--cyan));border-radius:6px;padding:3px 9px}
.rrow.me{background:linear-gradient(120deg,rgba(46,99,255,.28),rgba(18,194,224,.12));border-color:rgba(64,140,255,.45)}
.rrow.none .rname{color:var(--faint);font-weight:500}

/* ===== 价格页：免费+BYOK ===== */
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.mode{background:#fff;border:1px solid var(--line);border-radius:var(--r-md);padding:30px 28px;position:relative}
.mode .zero{font-family:var(--num);font-size:40px;font-weight:800;color:var(--ink);line-height:1;margin:14px 0 4px}
.mode .zero small{font-size:14px;color:var(--muted);font-weight:600}
.mode ul{margin:18px 0 0;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:11px}
.mode li{font-size:13.5px;color:var(--muted);padding-left:24px;position:relative}
.mode li::before{content:"✓";position:absolute;left:0;color:var(--ok);font-weight:800}
.mode.hl{border-color:var(--brand);box-shadow:0 18px 44px -20px rgba(46,99,255,.4)}
.mode .mbadge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:linear-gradient(130deg,var(--brand),var(--cyan));color:#fff;font-size:11.5px;font-weight:700;border-radius:99px;padding:4px 14px}
.usage-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.usage{background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:20px;text-align:center}
.usage .uic{font-size:24px}
.usage h4{margin:10px 0 4px;font-size:14.5px}
.usage p{font-size:12px;color:var(--faint);margin:0}
.usage .up{margin-top:10px;font-family:var(--num);font-weight:800;color:var(--brand);font-size:15px}
@media(max-width:980px){
  .mode-grid{grid-template-columns:1fr}
  .usage-grid{grid-template-columns:repeat(2,1fr)}
}

/* ===== U28 closed-mode mode switch (fail-closed) ===== */
html:not([data-site-open="1"]) [data-mode-hide]{display:none !important}
html[data-site-noconsole="1"] [data-mode-console]{display:none !important}