/* Core tokens, reset, navigation, forms, footer */
:root {
  --brand:#0060a0; --brand-bright:#1187c9; --navy:#0b2d50; --navy-deep:#071c31;
  --orange:#e08020; --orange-bright:#f49a3a; --ink:#111820; --steel:#5b6672;
  --steel-light:#8d98a3; --line:#d9e0e7; --line-dark:rgba(255,255,255,.12);
  --canvas:#f4f6f8; --white:#fff; --success:#1c8c68; --header-height:76px;
  --font-sans:"HarmonyOS Sans SC","MiSans","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","Bahnschrift","Consolas",monospace;
  --container:1280px; --radius-sm:6px; --radius-md:12px; --radius-lg:20px;
  --shadow-sm:0 10px 24px rgba(7,28,49,.07); --shadow-md:0 24px 64px rgba(7,28,49,.14);
  --space-section:clamp(64px,8vw,118px);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 20px)}
body{margin:0;min-width:320px;color:var(--ink);background:var(--canvas);font-family:var(--font-sans);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}
body.menu-open{overflow:hidden}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{border:0;cursor:pointer}
h1,h2,h3,h4,p{margin-top:0}
h1,h2,h3,h4{line-height:1.18;letter-spacing:-.025em}
p:last-child{margin-bottom:0}
::selection{color:var(--white);background:var(--brand)}
.skip-link{position:fixed;top:-80px;left:16px;z-index:9999;padding:12px 18px;color:var(--white);background:var(--navy);border-radius:var(--radius-sm)}
.skip-link:focus{top:12px}
.shell{width:min(calc(100% - 48px),var(--container));margin-inline:auto}
.section{padding-block:var(--space-section)}
.section--white{background:var(--white)}
.section--dark{color:var(--white);background:var(--navy-deep)}
.section--tight{padding-block:clamp(44px,5vw,72px)}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:32px;margin-bottom:clamp(32px,5vw,56px)}
.section-head__copy{max-width:760px}
.section-head h2{margin-bottom:14px;font-size:clamp(30px,4vw,52px);font-weight:700}
.section-head p{max-width:660px;margin-bottom:0;color:var(--steel);font-size:17px}
.section-head>.btn{flex:0 0 auto;white-space:nowrap}
.section--dark .section-head p,.section--dark .muted{color:#a9b7c4}
.eyebrow{display:inline-flex;align-items:center;gap:10px;margin-bottom:18px;color:var(--brand);font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase}
.eyebrow::before{width:26px;height:2px;content:"";background:var(--orange)}
.section--dark .eyebrow{color:#9ed8f7}
.text-orange{color:var(--orange)}
.muted{color:var(--steel)}
.mono{font-family:var(--font-mono)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 22px;border:1px solid transparent;border-radius:var(--radius-sm);font-size:15px;font-weight:650;line-height:1.2;transition:transform .18s,background .18s,border-color .18s,color .18s}
.btn:hover{transform:translateY(-2px)}
.btn:focus-visible,.nav-link:focus-visible,.mobile-toggle:focus-visible,.mega-link:focus-visible,.tab-button:focus-visible{outline:3px solid rgba(224,128,32,.45);outline-offset:3px}
.btn--primary{color:var(--white);background:var(--orange)}
.btn--primary:hover{background:var(--orange-bright)}
.btn--dark{color:var(--white);background:var(--navy)}
.btn--dark:hover{background:var(--brand)}
.btn--outline{color:var(--navy);border-color:#aeb9c3}
.btn--outline:hover{color:var(--brand);border-color:var(--brand)}
.btn--light{color:var(--navy);background:var(--white)}
.btn--ghost-light{color:var(--white);border-color:rgba(255,255,255,.3)}
.btn--ghost-light:hover{border-color:var(--white)}
.btn__arrow{font-family:var(--font-mono);font-size:18px;line-height:1}
.tag{display:inline-flex;align-items:center;gap:8px;min-height:28px;padding:3px 10px;color:var(--brand);background:rgba(0,96,160,.08);border:1px solid rgba(0,96,160,.14);border-radius:999px;font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.05em}
.tag--orange{color:#9b5210;background:rgba(224,128,32,.11);border-color:rgba(224,128,32,.2)}
.tag--dark{color:#bde7ff;background:rgba(17,135,201,.14);border-color:rgba(88,188,238,.24)}
.site-header{position:sticky;top:0;z-index:100;height:var(--header-height);background:rgba(255,255,255,.96);border-bottom:1px solid rgba(217,224,231,.9);backdrop-filter:blur(12px)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:100%;gap:30px}
.brand{display:flex;align-items:center;flex:0 0 auto}
.brand img{width:auto;height:42px;object-fit:contain}
.main-nav{display:flex;align-items:center;align-self:stretch;gap:2px}
.nav-item{position:relative;display:flex;align-items:center}
.nav-link{display:inline-flex;align-items:center;gap:6px;height:100%;padding:0 13px;color:#35424f;font-size:14px;font-weight:600;white-space:nowrap;transition:color .16s}
.nav-link::after{position:absolute;right:13px;bottom:0;left:13px;height:2px;content:"";background:var(--orange);transform:scaleX(0);transition:transform .16s}
.nav-link:hover,.nav-item.is-active>.nav-link{color:var(--brand)}
.nav-item.is-active>.nav-link::after,.nav-link:hover::after{transform:scaleX(1)}
.nav-chevron{width:7px;height:7px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:rotate(45deg) translateY(-2px)}
.header-actions{display:flex;align-items:center;gap:12px;flex:0 0 auto}
.header-phone{color:var(--steel);font-family:var(--font-mono);font-size:12px}
.header-phone strong{display:block;color:var(--navy);font-size:14px}
.header-wechat{display:inline-flex;align-items:center;gap:6px;min-height:40px;padding:0 14px;color:#fff;background:var(--brand);border:1px solid var(--brand);border-radius:999px;font-size:13px;font-weight:600;line-height:1;cursor:pointer;transition:background .16s,border-color .16s,box-shadow .16s}
.header-wechat:hover{background:#004f86;border-color:#004f86;box-shadow:0 6px 18px rgba(0,96,160,.24)}
.header-wechat:focus-visible{outline:3px solid rgba(0,96,160,.32);outline-offset:2px}
.header-wechat svg{width:16px;height:16px;flex:0 0 auto}
.header-cta{min-height:42px;padding:10px 18px}
.mega-menu{position:absolute;top:calc(100% - 1px);left:-20px;z-index:110;width:720px;padding:24px;background:var(--white);border:1px solid var(--line);border-radius:0 0 var(--radius-md) var(--radius-md);box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .16s,visibility .16s,transform .16s}
.nav-item:hover>.mega-menu,.nav-item:focus-within>.mega-menu,.nav-item.is-open>.mega-menu{opacity:1;visibility:visible;transform:translateY(0)}
.mega-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px 30px}
.mega-title{grid-column:1/-1;margin:0 0 8px;padding-bottom:12px;color:var(--steel-light);border-bottom:1px solid var(--line);font-family:var(--font-mono);font-size:11px;letter-spacing:.1em}
.mega-group-title{margin:8px 0;color:var(--navy);font-size:13px}
.mega-link{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:center;padding:10px;border-radius:var(--radius-sm);transition:background .16s}
.mega-link:hover{background:#f2f6f9}
.mega-icon{display:grid;width:34px;height:34px;color:var(--brand);background:rgba(0,96,160,.08);border:1px solid rgba(0,96,160,.12);border-radius:6px;place-items:center;font-family:var(--font-mono);font-size:11px;font-weight:700}
.mega-link strong{display:block;color:var(--navy);font-size:13px;line-height:1.4}
.mega-link small{display:block;margin-top:2px;color:var(--steel);font-size:11px;line-height:1.4}
.mobile-toggle{display:none;width:44px;height:44px;color:var(--navy);background:transparent;border:1px solid var(--line);border-radius:var(--radius-sm)}
.mobile-toggle span,.mobile-toggle::before,.mobile-toggle::after{display:block;width:20px;height:1.5px;margin:4px auto;content:"";background:currentColor;transition:transform .16s,opacity .16s}
.mobile-toggle[aria-expanded="true"] span{opacity:0}
.mobile-toggle[aria-expanded="true"]::before{transform:translateY(5.5px) rotate(45deg)}
.mobile-toggle[aria-expanded="true"]::after{transform:translateY(-5.5px) rotate(-45deg)}
.contact-form{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding:26px;color:var(--ink);background:var(--white);border-radius:var(--radius-md);box-shadow:var(--shadow-md)}
.contact-form .form-field--full{grid-column:1/-1}
.form-field label{display:block;margin-bottom:7px;color:#455463;font-size:12px;font-weight:650}
.form-field input,.form-field select,.form-field textarea{width:100%;min-height:44px;padding:10px 12px;color:var(--ink);background:#f9fbfc;border:1px solid #d6dee5;border-radius:var(--radius-sm);outline:none;transition:border-color .16s,box-shadow .16s}
.form-field textarea{min-height:88px;resize:vertical}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(0,96,160,.1)}
.contact-form .btn{grid-column:1/-1;justify-self:start}
.form-privacy{grid-column:1/-1;color:var(--steel-light);font-size:10px}
.form-success{display:none;grid-column:1/-1;padding:12px;color:#155b45;background:#e9f8f2;border:1px solid #b8e5d4;border-radius:var(--radius-sm);font-size:13px}
.form-success.is-visible{display:block}
.site-footer{color:#aebdca;background:#061522;border-top:1px solid rgba(255,255,255,.08)}
.footer-main{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:40px;padding-block:62px 52px}
.footer-brand img{width:auto;height:46px;padding:5px 8px;background:var(--white);border-radius:4px}
.footer-brand p{max-width:320px;margin:20px 0;color:#7f93a3;font-size:12px}
.footer-contact{font-family:var(--font-mono);font-size:12px;line-height:1.8}
.footer-contact strong{color:var(--white);font-size:17px}
.footer-col h3{margin-bottom:18px;color:var(--white);font-family:var(--font-mono);font-size:11px;letter-spacing:.09em}
.footer-col a,.footer-col span{display:block;margin-bottom:9px;color:#8195a5;font-size:12px}
.footer-col a:hover{color:var(--white)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;padding-block:18px;border-top:1px solid rgba(255,255,255,.08);color:#607585;font-size:10px}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s,transform .5s}
.reveal.is-visible{opacity:1;transform:none}
.mobile-cta{display:none}