:root{--blue:#2f6df6;--blue2:#4f8bff;--ink:#14213d;--muted:#68758d;--line:#e7edf7;--bg:#f7faff;--card:#fff;--shadow:0 24px 60px rgba(42,82,160,.14);--radius:24px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;color:var(--ink);background:#fff}.shell{width:min(1200px,calc(100% - 48px));margin:auto}.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.9);backdrop-filter:blur(18px);border-bottom:1px solid rgba(231,237,247,.9)}.nav{height:68px;display:flex;align-items:center;gap:28px}.brand{display:flex;align-items:center;gap:9px;text-decoration:none;color:var(--ink);white-space:nowrap}.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--blue),#71a7ff);color:#fff;font-weight:900;box-shadow:0 8px 18px rgba(47,109,246,.26)}.brand-cn{font-size:21px;font-weight:800}.brand-slogan{font-size:12px;color:#8390a7;margin-left:4px}.navlinks{display:flex;gap:26px;margin:auto}.navlinks a,.text-link{color:#34415b;text-decoration:none;font-size:14px;font-weight:650}.nav-actions{display:flex;align-items:center;gap:18px}.btn{display:inline-flex;align-items:center;justify-content:center;border-radius:12px;padding:13px 22px;text-decoration:none;font-weight:800;font-size:14px;transition:.2s}.btn:hover{transform:translateY(-1px)}.btn.small{padding:10px 16px;background:var(--blue);color:#fff}.btn.primary{background:linear-gradient(135deg,#2f6df6,#4d88ff);color:white;box-shadow:0 12px 28px rgba(47,109,246,.28)}.btn.ghost{background:rgba(255,255,255,.7);border:1px solid #d9e4f7;color:#23447b}.btn.large{padding:16px 26px;font-size:16px}.hero{position:relative;overflow:hidden;background:linear-gradient(180deg,#f7fbff 0%,#f2f8ff 72%,#fff 100%)}.hero-bg{position:absolute;inset:0;background:radial-gradient(ellipse at 25% 25%,rgba(86,155,255,.18),transparent 36%),radial-gradient(ellipse at 82% 55%,rgba(127,188,255,.18),transparent 38%),linear-gradient(180deg,transparent 55%,rgba(196,220,244,.3) 100%)}.hero-bg:after{content:"";position:absolute;left:-8%;right:-8%;bottom:90px;height:210px;opacity:.42;background:linear-gradient(145deg,transparent 0 22%,#dbeafd 22% 29%,transparent 29% 40%,#d6e8fa 40% 48%,transparent 48% 58%,#dbe9f8 58% 68%,transparent 68%);filter:blur(2px)}.hero-grid{position:relative;display:grid;grid-template-columns:.86fr 1.14fr;align-items:center;min-height:560px;padding:58px 0 34px}.hero-copy{padding:8px 0 20px;max-width:520px}.eyebrow{font-size:13px;font-weight:800;letter-spacing:.05em;color:#4b7fe6;margin-bottom:16px}.hero h1{font-size:50px;line-height:1.12;letter-spacing:-.03em;margin:0 0 20px;font-weight:900}.hero h1 span{color:var(--blue)}.lead{font-size:17px;line-height:1.85;color:#5c6a84;margin:0 0 26px}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.trustline{display:flex;gap:14px;flex-wrap:wrap;margin-top:22px;color:#7a879f;font-size:12px}.hero-visual{position:relative;min-height:430px;display:flex;align-items:center;justify-content:flex-end}.note{position:absolute;right:-6px;top:88px;font-family:"KaiTi","STKaiti",serif;font-size:21px;line-height:1.45;color:#3f547c;transform:rotate(-4deg)}.laptop{width:92%;max-width:700px;position:relative;margin-right:32px}.screen{background:#15223b;border-radius:20px;padding:11px;box-shadow:0 30px 70px rgba(33,69,133,.28)}.appbar{height:34px;border-radius:11px 11px 0 0;background:#f4f7fc;display:flex;align-items:center;justify-content:space-between;padding:0 13px;font-size:11px;color:#5b6a84}.mini-logo{display:inline-grid;place-items:center;width:18px;height:18px;background:var(--blue);color:#fff;border-radius:5px;font-weight:900}.appbody{display:grid;grid-template-columns:116px 1fr;background:#fff;border-radius:0 0 10px 10px;overflow:hidden;min-height:325px}.sidebar{background:#f4f7fb;padding:16px 10px}.sideitem{font-size:11px;padding:9px 10px;border-radius:7px;color:#6c7890;margin-bottom:5px}.sideitem.active{background:#dfeaff;color:#285fce;font-weight:800}.workspace{padding:19px 20px}.workspace-title{display:flex;justify-content:space-between;align-items:flex-start}.workspace-title b{display:block;font-size:17px}.workspace-title small{display:block;margin-top:4px;color:#8b98ad}.offline-badge{font-size:10px;color:#1a8d61;background:#e9fbf4;border-radius:999px;padding:6px 9px}.upload-card{display:flex;align-items:center;gap:10px;border:1px solid #e2e9f4;border-radius:12px;padding:12px;margin-top:16px;background:#fbfdff}.file-icon{width:38px;height:42px;border-radius:9px;background:#edf3ff;color:#2f6df6;display:grid;place-items:center;font-size:9px;font-weight:900}.upload-card b,.upload-card small{display:block;font-size:11px}.upload-card small{color:#92a0b3;margin-top:3px}.upload-card button{margin-left:auto;border:0;background:#edf3ff;color:#2f6df6;padding:7px 9px;border-radius:8px;font-size:9px}.result-grid{display:grid;grid-template-columns:125px 1fr;gap:16px;margin-top:14px}.score-card{border:1px solid #edf1f7;border-radius:12px;padding:12px;text-align:center}.score-ring{width:74px;height:74px;border-radius:50%;margin:auto;display:grid;place-items:center;background:conic-gradient(#f25c5c 0 68%,#edf1f7 68%);position:relative;font-size:20px;font-weight:900;color:#f05b5b}.score-ring:after{content:"";position:absolute;inset:7px;background:#fff;border-radius:50%;z-index:0}.score-ring>*{z-index:1}.score-ring span{position:absolute;font-size:7px;margin-top:28px;color:#9a6b6b;z-index:2}.score-card small{font-size:9px;color:#8491a6}.metrics{padding:4px 0}.metrics div{display:grid;grid-template-columns:75px 1fr 24px;gap:8px;align-items:center;margin:10px 0;font-size:9px;color:#68758d}.metrics b{height:5px;background:linear-gradient(90deg,#6ea1ff var(--p),#edf2f9 var(--p));border-radius:9px}.metrics em{font-style:normal;font-weight:800;color:#3d4e6d}.issue-list{margin-top:11px;display:grid;gap:8px}.issue{position:relative;border-radius:10px;padding:10px 11px 9px;border:1px solid #edf1f7;background:#fff}.issue:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;border-radius:10px 0 0 10px;background:#ff6767}.issue.mid:before{background:#f2b44f}.issue strong{font-size:9px}.issue span{float:right;font-size:8px;padding:3px 6px;border-radius:999px;background:#fff0f0;color:#dd5959}.issue.mid span{background:#fff8e9;color:#bf8327}.issue p{font-size:8px;color:#8994a6;margin:5px 0 0}.base{height:18px;width:108%;margin-left:-4%;background:linear-gradient(180deg,#d9e1ee,#aeb9ca);border-radius:4px 4px 28px 28px;box-shadow:0 10px 24px rgba(52,71,104,.22)}.value-strip{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:0;background:rgba(255,255,255,.9);border:1px solid #e9eef6;border-radius:18px;box-shadow:0 16px 44px rgba(69,104,164,.09);padding:20px 16px;margin-bottom:18px}.value-strip>div{display:grid;grid-template-columns:44px 1fr;grid-template-rows:auto auto;column-gap:10px;padding:2px 18px;border-right:1px solid #edf1f7}.value-strip>div:last-child{border-right:0}.value-strip .icon{grid-row:1/3;width:40px;height:40px;border-radius:12px;background:#edf4ff;display:grid;place-items:center;color:var(--blue);font-weight:900}.value-strip b{font-size:14px}.value-strip small{font-size:11px;color:#8793a6;margin-top:4px}.section{padding:92px 0}.section.light{background:#f8fbff}.section.alt{background:linear-gradient(180deg,#f7faff,#fff)}.center-intro{text-align:center;max-width:800px}.center-intro.narrow{max-width:760px}.center-intro h2,.split-head h2,.more-grid h2,.cta-card h2,.faq h2{font-size:36px;letter-spacing:-.025em;margin:0 0 16px}.center-intro p,.split-head>p,.more-grid p{color:#6c7890;line-height:1.8;font-size:16px}.flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr auto 1fr;gap:14px;align-items:center;margin-top:42px}.flow i{font-style:normal;color:#9db3d8;font-size:24px}.flow-card{background:#fff;border:1px solid #e7edf7;border-radius:20px;padding:24px;min-height:170px;box-shadow:0 14px 36px rgba(70,99,150,.07)}.flow-card span{display:grid;place-items:center;width:34px;height:34px;background:#eaf2ff;color:#2f6df6;border-radius:10px;font-weight:900;margin-bottom:20px}.flow-card b{display:block;font-size:16px}.flow-card small{display:block;margin-top:9px;line-height:1.6;color:#7d899d}.proof-card{margin-top:34px;background:linear-gradient(135deg,#183b79,#2f6df6);color:#fff;border-radius:26px;padding:34px 38px;display:grid;grid-template-columns:1.25fr .75fr;align-items:center;gap:30px;box-shadow:0 26px 60px rgba(47,109,246,.24)}.proof-card h3{font-size:26px;margin:8px 0}.proof-card p{line-height:1.75;color:#dfe9ff}.signal-off{display:inline-flex;background:rgba(255,255,255,.15);padding:8px 12px;border-radius:999px;font-weight:800}.security-points{display:grid;grid-template-columns:1fr 1fr;gap:12px}.security-points span{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.08);padding:14px;border-radius:14px;text-align:center;font-size:13px}.split-head{display:grid;grid-template-columns:1fr .9fr;gap:80px;align-items:end;margin-bottom:38px}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.feature-card{border:1px solid #e7edf7;background:#fff;border-radius:22px;padding:24px;min-height:300px;box-shadow:0 16px 42px rgba(70,99,150,.08)}.feature-card>span{display:inline-grid;place-items:center;width:38px;height:38px;border-radius:12px;background:#edf3ff;color:#2f6df6;font-weight:900}.feature-card.violet>span{background:#f3edff;color:#7c5ce0}.feature-card.green>span{background:#e9fbf3;color:#1d9a65}.feature-card.amber>span{background:#fff6e7;color:#d19128}.feature-card h3{font-size:21px;margin:18px 0 10px}.feature-card p{color:#778399;line-height:1.7;font-size:14px}.mini-chart{height:80px;display:flex;align-items:flex-end;gap:8px;margin-top:28px}.mini-chart b{width:18%;background:linear-gradient(#74a6ff,#dce9ff);border-radius:5px 5px 2px 2px}.mini-list{margin-top:28px;display:grid;gap:10px}.mini-list i{height:36px;border-radius:10px;background:linear-gradient(90deg,#eef4ff 0 76%,#ffdede 76%)}.mini-bars{display:grid;gap:11px;margin-top:30px}.mini-bars b{height:11px;border-radius:999px;background:linear-gradient(90deg,#44b77b var(--w),#ebf3ef var(--w))}.quote{margin-top:24px;border-left:3px solid #e3aa45;background:#fffaf0;padding:14px;color:#7c6a4d;font-size:13px;line-height:1.65}.comparison{display:grid;grid-template-columns:1fr 70px 1fr;align-items:center;gap:20px;margin-top:44px}.compare{border-radius:24px;padding:30px;min-height:330px;border:1px solid #e7edf7}.compare.old{background:#fafbfc}.compare.new{background:linear-gradient(135deg,#eef5ff,#f8fbff);border-color:#dce8ff}.compare small{color:#8b97aa;font-weight:800}.compare h3{font-size:24px}.big-number{font-size:76px;font-weight:900;color:#d46d6d;margin:28px 0}.compare p{color:#7f8a9d;line-height:1.7}.compare ul{padding:0;list-style:none;display:grid;gap:14px;margin-top:30px}.compare li{background:#fff;border:1px solid #e2eaf7;border-radius:14px;padding:16px;color:#536079}.vs{text-align:center;font-weight:900;color:#95a6c1}.more-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}.text-cta{display:inline-block;margin-top:10px;color:#2f6df6;font-weight:900;text-decoration:none}.cap-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.cap-grid div{padding:22px;border:1px solid #e6edf7;border-radius:18px;background:#fff;box-shadow:0 12px 32px rgba(70,99,150,.06)}.cap-grid b,.cap-grid small{display:block}.cap-grid small{color:#8590a2;margin-top:7px;line-height:1.5}.cta-section{padding:30px 0 90px}.cta-card{border-radius:28px;padding:42px 46px;background:linear-gradient(135deg,#eef5ff,#f6fbff);border:1px solid #dfeafd;display:grid;grid-template-columns:1fr auto;gap:30px;align-items:center}.cta-card p{color:#6d7a90}.cta-actions{text-align:right}.cta-actions small{display:block;color:#8b97a8;margin-top:10px;max-width:280px}.faq{padding-top:20px}.faq details{border-bottom:1px solid #e9eef5;padding:18px 0}.faq summary{cursor:pointer;font-weight:800}.faq details p{color:#738096;line-height:1.7}.footer-grid{display:grid;grid-template-columns:1.7fr .6fr .6fr;gap:50px;padding:46px 0 28px}.footer-grid p{color:#8792a3}.footer-grid>div:not(:first-child){display:grid;gap:10px;align-content:start}.footer-grid a{color:#768295;text-decoration:none;font-size:13px}.copyright{border-top:1px solid #edf1f6;padding:18px 0 30px;color:#9aa4b3;font-size:12px}.footer-brand{pointer-events:none}
@media(max-width:1100px){.navlinks{display:none}.hero-grid{grid-template-columns:1fr 1.08fr}.hero h1{font-size:43px}.note{display:none}.feature-grid{grid-template-columns:1fr 1fr}.flow{grid-template-columns:1fr 1fr}.flow i{display:none}.value-strip{grid-template-columns:1fr 1fr}.value-strip>div:nth-child(2){border-right:0}.value-strip>div{margin:6px 0}.comparison{grid-template-columns:1fr}.vs{padding:4px}.more-grid{gap:40px}}
@media(max-width:820px){.shell{width:min(100% - 28px,1200px)}.brand-slogan,.text-link{display:none}.hero-grid{grid-template-columns:1fr;padding-top:38px}.hero-copy{max-width:none}.hero h1{font-size:40px}.hero-visual{min-height:360px}.laptop{width:100%;margin:0}.value-strip{grid-template-columns:1fr;margin-top:10px}.value-strip>div{border-right:0!important;border-bottom:1px solid #edf1f7;padding:14px 8px}.value-strip>div:last-child{border-bottom:0}.flow{grid-template-columns:1fr}.proof-card,.split-head,.more-grid,.cta-card{grid-template-columns:1fr}.feature-grid{grid-template-columns:1fr}.comparison{grid-template-columns:1fr}.cta-actions{text-align:left}.center-intro h2,.split-head h2,.more-grid h2,.cta-card h2,.faq h2{font-size:30px}.section{padding:68px 0}.appbody{grid-template-columns:88px 1fr}.sidebar{padding:12px 6px}.sideitem{padding:8px 7px}.workspace{padding:14px}.result-grid{grid-template-columns:100px 1fr}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}}
@media(max-width:540px){.nav{height:60px}.nav-actions .btn.small{font-size:12px;padding:9px 12px}.hero h1{font-size:34px}.lead{font-size:15px}.hero-actions{display:grid}.trustline{display:grid}.hero-visual{min-height:300px}.appbody{grid-template-columns:70px 1fr;min-height:280px}.sideitem{font-size:8px}.workspace-title b{font-size:14px}.workspace{padding:10px}.upload-card{padding:8px}.result-grid{grid-template-columns:1fr}.score-card{display:none}.issue.mid{display:none}.proof-card{padding:28px 22px}.security-points{grid-template-columns:1fr 1fr}.cap-grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}.cta-card{padding:30px 22px}}

/* v4.1 desktop composition — 1366/1440/1920 first */
@media (min-width:1181px){
  .shell{width:min(1240px,calc(100% - 64px))}
  .nav{height:64px;gap:24px}
  .navlinks{gap:24px}
  .hero-grid{grid-template-columns:44% 56%;min-height:520px;padding:42px 0 24px;gap:10px}
  .hero-copy{max-width:500px;padding:0 0 12px}
  .hero h1{font-size:48px;line-height:1.08;margin-bottom:18px}
  .lead{font-size:16px;line-height:1.75;max-width:490px;margin-bottom:22px}
  .hero-visual{min-height:400px;justify-content:center;padding-left:16px}
  .laptop{width:min(96%,690px);margin:0}
  .note{right:-4px;top:54px;font-size:19px}
  .value-strip{margin-top:0;margin-bottom:16px;padding:18px 12px}
  .value-strip>div{padding:0 16px}
}
@media (min-width:1181px) and (max-width:1420px){
  .shell{width:min(1180px,calc(100% - 48px))}
  .navlinks{gap:18px}
  .brand-slogan{display:none}
  .hero-grid{grid-template-columns:43% 57%;min-height:500px;padding-top:34px}
  .hero h1{font-size:43px}
  .lead{font-size:15px}
  .laptop{width:96%;max-width:650px}
  .note{display:none}
}

/* v4.2 bilingual + direct download */
.lang-link{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:38px;height:34px;padding:0 10px;border:1px solid #dbe5f5;
  border-radius:10px;color:#52647f;text-decoration:none;font-size:12px;font-weight:800;
  background:rgba(255,255,255,.78)
}
.lang-link:hover{color:var(--blue);border-color:#bcd0fb;background:#f5f8ff}
.lang-en .hero-copy{max-width:535px}
.lang-en .hero h1{letter-spacing:-1.5px}
.lang-en .brand-slogan{font-size:11px}
.lang-en .navlinks{gap:20px}
@media(min-width:1181px) and (max-width:1420px){
  .lang-en .hero h1{font-size:41px}
  .lang-en .lead{font-size:14.5px}
}
@media(max-width:540px){
  .lang-link{min-width:34px;height:32px;padding:0 8px}
}