:root{
  --navy:#0c1a33;
  --navy-soft:#12264a;
  --blue:#1f5eff;
  --blue-deep:#1446d6;
  --ink:#152238;
  --ink-soft:#52607a;
  --paper:#f4f7fb;
  --line:#e2e8f2;
  --orange:#ff7a1a;
  --green:#22a06b;
  --white:#fff;
  --body:'Inter','Noto Sans SC',system-ui,sans-serif;
  --head:'Plus Jakarta Sans','Noto Sans SC',sans-serif;
  --mono:'JetBrains Mono',monospace;
  --shadow:0 1px 2px rgba(15,30,60,.06),0 10px 30px rgba(15,30,60,.07);
  --shadow-lg:0 8px 20px rgba(15,30,60,.1),0 30px 70px rgba(15,30,60,.14);
  --radius:10px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--body);font-size:16.5px;line-height:1.7;color:var(--ink);background:#fff;overflow-x:hidden;-webkit-font-smoothing:antialiased}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4,h5,.h-display{font-family:var(--head);color:var(--navy);line-height:1.2}
.container{width:min(1200px,92%);margin:0 auto}

/* ── buttons ─────────────────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-family:var(--head);font-weight:700;font-size:15.5px;padding:15px 32px;border:none;border-radius:var(--radius);cursor:pointer;transition:all .22s;line-height:1}
.btn-primary{background:var(--blue);color:#fff;-webkit-box-shadow:0 10px 26px rgba(31,94,255,.3);box-shadow:0 10px 26px rgba(31,94,255,.3)}
.btn-primary:hover{background:var(--blue-deep);-webkit-transform:translateY(-1px);transform:translateY(-1px)}
.btn-light{background:#fff;color:var(--navy)}
.btn-light:hover{-webkit-transform:translateY(-1px);transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--navy);border:1.5px solid var(--line);-webkit-box-shadow:none;box-shadow:none}
.btn-outline:hover{border-color:var(--blue);color:var(--blue)}
.btn-dark{background:var(--navy);color:#fff}
.btn-dark:hover{background:var(--blue)}
.btn svg{width:16px;height:16px;stroke:currentColor}

/* ── topbar ──────────────────────────── */
.topbar{background:var(--navy);color:#b9c6dd;font-size:13px}
.topbar .container{display:flex;justify-content:space-between;align-items:center;height:40px;gap:18px}
.tb-left{display:flex;gap:24px}
.tb-left span{display:flex;align-items:center;gap:8px}
.tb-left svg{width:14px;height:14px;stroke:#7fb0ff}
.tb-right{display:flex;align-items:center;gap:18px}
.tb-right a,.tb-right span.tb-btn{display:flex;align-items:center;gap:7px;color:#cfe0fa}
.tb-right a:hover{color:#fff}
.tb-right svg{width:13px;height:13px;stroke:#7fb0ff}
.wa-pill{display:inline-flex;align-items:center;gap:7px;background:rgba(34,197,94,.16);color:#7ff6b0!important;border:1px solid rgba(34,197,94,.4);border-radius:999px;padding:3px 12px;font-family:var(--mono);font-size:12px}

/* ── lang switch ─────────────────────── */
.lang-sw{position:relative;display:flex;align-items:center;gap:7px;cursor:pointer;font-family:var(--mono);font-size:12.5px;text-transform:uppercase;color:#d7e4f8}
.lang-sw svg{width:14px;height:14px;stroke:#7fb0ff}
.lang-sw .caret{width:10px;height:10px;transition:transform .2s}
.lang-sw.open .caret{-webkit-transform:rotate(180deg);transform:rotate(180deg)}
.lang-menu{position:absolute;top:calc(100% + 10px);right:0;z-index:200;min-width:160px;background:#fff;border:1px solid var(--line);border-radius:8px;padding:6px;display:none;box-shadow:var(--shadow-lg)}
.lang-sw.open .lang-menu{display:block}
.lang-menu a{display:flex;justify-content:space-between;align-items:center;gap:10px;padding:9px 12px;font-family:var(--body);font-size:14px;color:var(--ink-soft);border-radius:6px}
.lang-menu a:hover{background:var(--paper);color:var(--blue)}
.lang-menu a.cur{color:var(--blue);font-weight:600}
.lang-menu a i{font-style:normal;font-family:var(--mono);font-size:11px;color:#9aa7bd}

/* ── nav ─────────────────────────────── */
.navbar{position:sticky;top:0;z-index:120;background:rgba(255,255,255,.97);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);box-shadow:0 1px 0 var(--line)}
.navbar.scrolled{box-shadow:var(--shadow)}
.navbar .container{display:flex;align-items:center;justify-content:space-between;height:76px;gap:20px}
.brand{display:flex;align-items:center;gap:12px}
.brand .logo{width:44px;height:44px;flex-shrink:0;border-radius:9px;background:linear-gradient(135deg,var(--blue),#0e2a5f);display:grid;place-items:center}
.brand .logo svg{width:24px;height:24px;stroke:#fff}
.brand-name{font-family:var(--head);font-weight:800;font-size:22px;color:var(--navy);line-height:1}
.brand-name small{display:block;font-family:var(--mono);font-size:9px;letter-spacing:.22em;text-transform:uppercase;color:var(--blue);font-weight:600;margin-top:4px}
.nav-links{display:flex;gap:2px;list-style:none}
.nav-links>li{position:relative}
.nav-links>li>a{display:block;font-family:var(--head);font-weight:600;font-size:15.5px;color:var(--ink);padding:11px 15px;border-radius:8px;transition:all .2s}
.nav-links>li>a:hover{color:var(--blue);background:var(--paper)}
.nav-links>li>a.active{color:var(--blue);background:var(--paper);font-weight:700}
.nav-links>li.has-drop>a::after{content:"";display:inline-block;width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;-webkit-transform:rotate(45deg);transform:rotate(45deg);margin-left:8px;margin-bottom:2px}
.drop-wrap{position:absolute;top:calc(100% + 4px);left:0;z-index:160;padding-top:8px;opacity:0;visibility:hidden;-webkit-transform:translateY(8px);transform:translateY(8px);transition:all .2s}
.has-drop.open>.drop-wrap{opacity:1;visibility:visible;-webkit-transform:translateY(0);transform:translateY(0)}
.drop-menu{background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow-lg);padding:10px;width:260px}
.drop-menu a{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:8px;font-size:15px;color:var(--ink-soft)}
.drop-menu a:hover{background:var(--paper);color:var(--blue)}
.drop-menu a svg{width:16px;height:16px;stroke:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:10px}
.search-btn{width:42px;height:42px;border:1.5px solid var(--line);border-radius:9px;background:#fff;display:grid;place-items:center;cursor:pointer;color:var(--ink);transition:all .2s}
.search-btn:hover{border-color:var(--blue);color:var(--blue)}
.search-btn svg{width:18px;height:18px;stroke:currentColor}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.burger span{width:26px;height:2.4px;background:var(--navy);border-radius:2px;transition:.28s}
.burger.open span:nth-child(1){-webkit-transform:translateY(7.4px) rotate(45deg);transform:translateY(7.4px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){-webkit-transform:translateY(-7.4px) rotate(-45deg);transform:translateY(-7.4px) rotate(-45deg)}

/* ── search panel ────────────────────── */
.search-panel{position:fixed;inset:0;z-index:400;background:rgba(12,26,51,.96);display:none;align-items:flex-start;justify-content:center;padding:90px 20px}
.search-panel.open{display:flex}
.search-panel .box{width:min(720px,100%)}
.search-panel input{width:100%;background:transparent;border:none;border-bottom:2px solid rgba(255,255,255,.3);color:#fff;font-family:var(--head);font-size:30px;padding:14px 4px;outline:none}
.search-panel input:focus{border-color:var(--blue)}
.search-panel input::-webkit-input-placeholder{color:#7d90b0}
.search-panel input::-moz-placeholder{color:#7d90b0}
.search-panel .hint{margin-top:12px;font-family:var(--mono);font-size:12px;color:#7d90b0;letter-spacing:.05em}
.search-panel .close{position:absolute;top:26px;right:34px;background:none;border:none;color:#fff;font-size:40px;cursor:pointer;line-height:1}
.search-status{margin-top:20px;font-family:var(--mono);font-size:12px;color:#7fb0ff;letter-spacing:.1em;text-transform:uppercase;min-height:16px}
.search-results{margin-top:14px;display:flex;flex-direction:column;gap:10px;max-height:52vh;overflow:auto}
.search-results .sr{display:flex;align-items:center;gap:14px;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:10px;padding:13px 16px;color:#fff;transition:all .2s}
.search-results .sr:hover{border-color:#7fb0ff;-webkit-transform:translateX(4px);transform:translateX(4px)}
.search-results .sr .st{font-family:var(--mono);font-size:10.5px;color:#7fb0ff;border:1px solid rgba(127,176,255,.4);border-radius:5px;padding:2px 7px;flex-shrink:0}
.search-results .sr .tt{font-size:15.5px}
.search-results .sr .sn{font-family:var(--mono);font-size:12px;color:#8b9cba}

/* ── section scaffold ────────────────── */
.kicker{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12.5px;letter-spacing:.2em;text-transform:uppercase;color:var(--blue);font-weight:600}
.kicker::before{content:"";width:28px;height:2px;background:var(--blue)}
.sec{padding:90px 0}
.sec.tint{background:var(--paper)}
.sec .sec-head{max-width:620px;margin-bottom:48px}
.sec .sec-head h2{font-size:clamp(28px,3.4vw,40px);margin-top:12px}
.sec .sec-head p.desc{margin-top:14px;color:var(--ink-soft)}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
.sec-head.center .kicker{justify-content:center}
.sec-head.center .kicker::before{display:none}

/* ── page hero (inner pages) ─────────── */
.page-hero{background:linear-gradient(135deg,var(--navy) 0%,#12315f 60%,#1b4390 100%);color:#fff;padding:64px 0 60px;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;background:radial-gradient(circle,rgba(31,94,255,.35),transparent 70%)}
.page-hero .container{position:relative;z-index:2}
.page-hero .breadcrumb{font-family:var(--mono);font-size:12.5px;color:#8fb1e8;margin-bottom:18px;letter-spacing:.04em}
.page-hero .breadcrumb a:hover{color:#fff}
.page-hero .breadcrumb .sep{margin:0 9px;color:#4f6f9f}
.page-hero .breadcrumb .cur{color:#cfe0fa}
.page-hero h1{color:#fff;font-size:clamp(30px,3.6vw,44px);margin-top:6px}
.page-hero .lead{color:#b9cdeb;margin-top:12px;max-width:640px}
.page-hero .kicker{color:#7fb0ff}
.page-hero .kicker::before{background:#7fb0ff}
.page-hero .hero-cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}

/* ── cta band ────────────────────────── */
.cta-band{background:linear-gradient(120deg,var(--blue) 0%,#1643b0 100%);color:#fff;padding:44px 0}
.cta-band .container{display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.cta-band h2{color:#fff;font-size:clamp(22px,2.6vw,30px)}
.cta-band p{color:#d4e1ff;margin-top:8px}
.cta-band .btn{box-shadow:0 10px 26px rgba(0,0,0,.18)}

/* ── pagination ──────────────────────── */
.pagination{display:flex;gap:8px;justify-content:center;margin-top:44px}
.pagination a,.pagination .current{min-width:42px;height:42px;display:grid;place-items:center;border:1.5px solid var(--line);border-radius:9px;font-family:var(--head);font-weight:600;font-size:15px;color:var(--ink-soft);transition:all .2s}
.pagination a:hover{border-color:var(--blue);color:var(--blue)}
.pagination .current{background:var(--blue);border-color:var(--blue);color:#fff}

/* ── forms ───────────────────────────── */
.field{display:flex;flex-direction:column;gap:7px}
.field label{font-family:var(--head);font-weight:600;font-size:14px;color:var(--navy)}
.field input,.field select,.field textarea{border:1.5px solid var(--line);border-radius:9px;padding:13px 15px;font-family:var(--body);font-size:15px;color:var(--ink);background:#fff;outline:none;transition:border-color .2s}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue)}
.field textarea{resize:vertical;min-height:96px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-grid .full{grid-column:1/-1}
.form-note{display:flex;gap:8px;align-items:center;font-size:13px;color:var(--ink-soft);margin:14px 0}
.form-note svg{width:16px;height:16px;stroke:var(--green);flex-shrink:0}

/* ── whatsapp float ──────────────────── */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:300;width:58px;height:58px;border-radius:50%;background:#25d366;color:#fff;display:grid;place-items:center;box-shadow:0 10px 30px rgba(37,211,102,.45);transition:all .25s}
.wa-float:hover{-webkit-transform:scale(1.08);transform:scale(1.08)}
.wa-float svg{width:30px;height:30px;fill:#fff}

/* ── reveal ──────────────────────────── */
[data-reveal]{opacity:0;-webkit-transform:translateY(26px);transform:translateY(26px);transition:opacity .7s cubic-bezier(.16,1,.3,1),-webkit-transform .7s cubic-bezier(.16,1,.3,1);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
[data-reveal="left"]{opacity:0;-webkit-transform:translateX(-34px);transform:translateX(-34px);transition:opacity .7s cubic-bezier(.16,1,.3,1),-webkit-transform .7s;transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s}
[data-reveal="right"]{opacity:0;-webkit-transform:translateX(34px);transform:translateX(34px);transition:opacity .7s cubic-bezier(.16,1,.3,1),-webkit-transform .7s;transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s}
[data-reveal].in{opacity:1;-webkit-transform:none;transform:none}

/* ── footer ──────────────────────────── */
footer{background:var(--navy);color:#8fa5c7;font-size:15px}
.foot-main{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:40px;padding:64px 0}
footer h4{color:#fff;font-size:16px;margin-bottom:18px}
footer ul{list-style:none;display:flex;flex-direction:column;gap:10px}
footer ul a:hover{color:#fff}
footer .foot-about p{margin:16px 0;color:#7690b5}
.foot-brand{display:flex;align-items:center;gap:12px}
.foot-brand .logo{width:42px;height:42px;border-radius:8px;background:linear-gradient(135deg,var(--blue),#0e2a5f);display:grid;place-items:center}
.foot-brand .logo svg{width:22px;height:22px;stroke:#fff}
.foot-brand .brand-name{color:#fff}
.foot-contact li{display:flex;gap:10px;align-items:flex-start}
.foot-contact svg{width:16px;height:16px;stroke:#7fb0ff;flex-shrink:0;margin-top:6px}
.foot-cert{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}
.foot-cert span{font-family:var(--mono);font-size:11px;letter-spacing:.06em;border:1px solid rgba(255,255,255,.22);color:#b9cdeb;border-radius:5px;padding:4px 10px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.1);padding:22px 0;font-family:var(--mono);font-size:12.5px;color:#5e7798}
.foot-bottom .container{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}
.foot-bottom a{color:#7fb0ff}

/* ── rich text / prose ──────────────── */
.rich-text{color:var(--ink-soft)}
.rich-text p{margin-bottom:16px}
.rich-text h1,.rich-text h2,.rich-text h3{margin:26px 0 12px}
.rich-text ul,.rich-text ol{padding-left:22px;margin-bottom:16px}
.rich-text a{color:var(--blue);text-decoration:underline}
.rich-text b,.rich-text strong{color:var(--navy)}
.rich-text img{border-radius:10px;margin:14px 0}

/* ── progress bar ────────────────────── */
.scrollbar{position:fixed;top:0;left:0;height:3px;width:0;background:linear-gradient(90deg,var(--blue),var(--orange));z-index:500}

/* ── responsive ──────────────────────── */
@media(max-width:1000px){
  .foot-main{grid-template-columns:1fr 1fr}
  .nav-links{position:fixed;inset:0;background:#fff;flex-direction:column;padding:96px 24px 30px;gap:4px;display:none;z-index:150;overflow:auto}
  .nav-links.open{display:flex}
  .nav-links>li>a{padding:16px 8px;font-size:18px;border-bottom:1px solid var(--line);border-radius:0}
  .nav-links>li>a.active{color:var(--blue);background:transparent}
  .drop-wrap{position:static;opacity:1;visibility:visible;-webkit-transform:none;transform:none;padding:0;display:none}
  .has-drop.open>.drop-wrap{display:block}
  .drop-menu{width:100%;border:none;box-shadow:none;padding:0 0 8px 14px}
  .drop-menu a{padding:10px 8px}
  .navbar{-webkit-backdrop-filter:none;backdrop-filter:none}
  .burger{display:flex;z-index:160}
  .topbar .tb-left{display:none}
  .topbar .tb-right{gap:12px}
  .topbar .tb-right a.wa-pill{display:none}
  .search-btn{display:none}
}
@media(max-width:640px){
  body{font-size:15.5px}
  .sec{padding:64px 0}
  .form-grid{grid-template-columns:1fr}
  .foot-main{grid-template-columns:1fr;gap:30px}
  .cta-band .container{flex-direction:column;text-align:center}
  .topbar .tb-right>a:first-child{display:none}
  .topbar .container{height:36px}
  .topbar .tb-right svg{width:14px;height:14px}
  .brand .logo{width:38px;height:38px}
  .brand .logo svg{width:20px;height:20px}
  .brand-name{font-size:16px;line-height:1.1}
  .brand-name small{font-size:7.5px;letter-spacing:.14em}
  .navbar .container{height:64px;gap:10px}
  .nav-actions{gap:6px}
  .nav-actions .btn{display:none}
  .nav-links{padding-top:80px}
}

/* 富文本卡片：提示框 / 公式 */
.art-call{border:1px solid var(--line);border-left:4px solid var(--blue);border-radius:10px;background:#fff;padding:16px 20px;margin:22px 0;font-size:15px}
.art-call.blue{border-left-color:var(--blue);background:#f7faff}
.art-call .h{font-weight:700;color:var(--navy);margin-bottom:10px;font-family:var(--head)}
.art-call ul{list-style:none;padding:0;margin:0;display:grid;gap:7px}
.art-call li{padding-left:22px;position:relative}
.art-call li::before{content:"";position:absolute;left:0;top:8px;width:7px;height:7px;border-radius:50%;background:var(--blue)}
.art-formula{background:var(--navy);color:#fff;border-radius:10px;padding:18px 22px;font-family:var(--mono);font-size:19px;text-align:center;margin:22px 0;letter-spacing:.02em}
.art-formula .lab{display:block;font-family:var(--head);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:#9dbbe8;margin-bottom:8px;text-align:left}
.rich-text .art-call{max-width:100%}