:root{
  --paper:#F7F7F5; --surface:#FFFFFF; --ink:#17191C; --muted:#5A6068; --line:#DCDEDA;
  --slate:#22333C; --slate-ink:#EEF1F0; --slate-muted:#A9B6BB;
  --seal:#B3261E; --seal-soft:#F6E7E5; --focus:#2F6F86;
  --serif:"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC",Georgia,"Times New Roman",serif;
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",Roboto,sans-serif;
  --logo-plate:transparent;
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  color-scheme:dark;--paper:#121517;--surface:#1A1E21;--ink:#ECEDEA;--muted:#A3A9AE;--line:#2D3337;
  --slate:#1C2B32;--slate-ink:#EEF1F0;--slate-muted:#9FB0B6;--seal:#E0564B;--seal-soft:#3A1F1C;--focus:#7FC0D6;--logo-plate:#F7F7F5;}}
:root[data-theme="dark"]{
  color-scheme:dark;--paper:#121517;--surface:#1A1E21;--ink:#ECEDEA;--muted:#A3A9AE;--line:#2D3337;
  --slate:#1C2B32;--slate-ink:#EEF1F0;--slate-muted:#9FB0B6;--seal:#E0564B;--seal-soft:#3A1F1C;--focus:#7FC0D6;--logo-plate:#F7F7F5;}

*{box-sizing:border-box}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;padding-bottom:72px}
@media (min-width:860px){body{padding-bottom:0}}
a{color:inherit}
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:4px}
.wrap{max-width:1120px;margin:0 auto;padding-inline:20px}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.3;text-wrap:balance;margin:0}
p{margin:0}
.eyebrow{font-size:13px;letter-spacing:.12em;color:var(--muted);text-transform:uppercase}

/* header */
header{position:sticky;top:env(safe-area-inset-top,0px);z-index:10;background:color-mix(in srgb,var(--paper) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.bar{display:flex;align-items:center;gap:24px;min-height:68px}
.logo{display:flex;align-items:center;background:var(--logo-plate);border-radius:6px;padding:2px 6px;flex-shrink:0}
.logo img{height:44px;width:auto;display:block}
nav{display:none;gap:22px;font-size:15px;margin-left:auto}
nav a{text-decoration:none;color:var(--muted)} nav a:hover{color:var(--ink)}
@media (min-width:860px){nav{display:flex}}
.lang{margin-left:auto;display:flex;border:1px solid var(--line);border-radius:999px;overflow:hidden;font-size:13px}
@media (min-width:860px){.lang{margin-left:0}}
.lang button{border:0;background:transparent;color:var(--muted);padding:6px 12px;cursor:pointer;font:inherit}
.lang button[aria-pressed="true"]{background:var(--ink);color:var(--paper)}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:8px;padding:13px 22px;font:600 16px/1 var(--sans);text-decoration:none;cursor:pointer;border:1px solid var(--ink)}
.btn-primary{background:var(--ink);color:var(--paper)}
.btn-ghost{background:transparent;color:var(--ink)}
.btn:hover{transform:translateY(-1px)} @media (prefers-reduced-motion:reduce){.btn:hover{transform:none}}

/* hero */
.hero{padding-block:56px 64px}
.hero-grid{display:grid;gap:40px;align-items:center}
@media (min-width:860px){.hero-grid{grid-template-columns:1.15fr .85fr;gap:64px}.hero{padding-block:88px 96px}}
.hero h1{font-size:clamp(32px,5vw,52px);letter-spacing:.01em}
body.en .hero h1{font-size:clamp(32px,4.6vw,50px)}
.hero .lede{margin-top:22px;font-size:18px;color:var(--muted);max-width:34em}
.cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.portrait{position:relative;max-width:420px;justify-self:center;width:100%}
.portrait img{width:100%;aspect-ratio:4/5;object-fit:cover;border-radius:4px;display:block;max-width:100%}
.licence{position:static;margin-top:12px;background:var(--surface);border:1px solid var(--line);padding:14px 18px 14px 16px;display:grid;grid-template-columns:auto 1fr;gap:4px 14px;align-items:center;max-width:100%}

.portrait .licence img.iaa{grid-row:span 3;width:64px;height:auto;aspect-ratio:auto;border-radius:0;object-fit:contain}
.seal{grid-row:span 3;width:44px;height:44px;border:2px solid var(--seal);color:var(--seal);font:700 14px/1.1 var(--serif);display:grid;place-items:center;text-align:center;border-radius:6px;padding:2px}
.licence b{font-family:var(--serif);font-size:17px}
.licence .no{font-variant-numeric:tabular-nums;font-size:14px;color:var(--muted)}
.licence a{font-size:13px;color:var(--focus)}

/* facts */
.facts{border-block:1px solid var(--line);background:var(--surface)}
.facts ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr))}
.facts li{padding:20px 20px 20px 0;display:flex;flex-direction:column;gap:2px}
.facts strong{font-family:var(--serif);font-size:20px;font-variant-numeric:tabular-nums}
.facts span{font-size:14px;color:var(--muted)}

section.block{padding-block:72px}
.head{display:flex;flex-direction:column;gap:10px;margin-bottom:36px;max-width:40em}
.head h2{font-size:clamp(26px,3.4vw,34px)}
.head p{color:var(--muted)}

/* paths */
.paths{display:grid;gap:1px;background:var(--line);border:1px solid var(--line);grid-template-columns:1fr}
@media (min-width:600px){.paths{grid-template-columns:1fr 1fr}}
@media (min-width:960px){.paths{grid-template-columns:repeat(3,1fr)}}
.path{background:var(--surface);padding:26px 24px;text-decoration:none;display:flex;flex-direction:column;gap:8px;min-height:150px;transition:background .15s}
.path:hover{background:var(--paper)}
.path h3{font-size:21px;display:flex;justify-content:space-between;gap:12px}
.path h3 i{font-style:normal;color:var(--muted);font-family:var(--sans);font-weight:400}
.path p{color:var(--muted);font-size:15px}
.path.flag h3::before{content:"";display:none}
.path .tag{align-self:flex-start;font-size:12px;color:var(--seal);border:1px solid var(--seal);border-radius:999px;padding:1px 10px;margin-top:auto}

.band{margin:0}
.band img{display:block;width:100%;height:clamp(160px,28vw,360px);object-fit:cover;max-width:100%}
.band figcaption{font-size:12px;color:var(--muted);padding-block:8px}
/* process */
.process{background:var(--slate);color:var(--slate-ink)}
.process .head p{color:var(--slate-muted)}
.steps{list-style:none;margin:0;padding:0;display:grid;gap:28px;grid-template-columns:1fr;counter-reset:s}
@media (min-width:760px){.steps{grid-template-columns:repeat(4,1fr);gap:24px}}
.steps li{counter-increment:s;border-top:1px solid color-mix(in srgb,var(--slate-ink) 30%,transparent);padding-top:18px;display:flex;flex-direction:column;gap:8px}
.steps li::before{content:counter(s);font:700 30px/1 var(--serif);color:var(--slate-muted)}
.steps h3{font-size:19px}
.steps p{font-size:15px;color:var(--slate-muted)}
.promise{display:flex;gap:16px;align-items:center;margin-top:40px;padding:18px 20px;border:1px solid color-mix(in srgb,var(--slate-ink) 30%,transparent);border-radius:6px;font-size:16px;max-width:46em}

.avatar{width:56px;height:56px;border-radius:50%;object-fit:cover;flex-shrink:0}
/* guides */
.guides{display:grid;gap:0;border-top:1px solid var(--line)}
.guide{display:grid;grid-template-columns:1fr;gap:6px;padding:22px 0;border-bottom:1px solid var(--line);text-decoration:none}
@media (min-width:760px){.guide{grid-template-columns:180px 1fr auto;gap:24px;align-items:baseline}}
.guide .cat{font-size:13px;color:var(--muted);letter-spacing:.06em}
.guide h3{font-size:20px}
.guide .more{font-size:14px;color:var(--focus)}
.guide:hover h3{text-decoration:underline;text-underline-offset:4px}

/* contact */
.contact-grid{display:grid;gap:32px}
@media (min-width:900px){.contact-grid{grid-template-columns:1.35fr .65fr;gap:48px}}
form{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:28px;display:grid;gap:18px}
.row{display:grid;gap:18px}
@media (min-width:600px){.row{grid-template-columns:1fr 1fr}}
label{display:flex;flex-direction:column;gap:6px;font-size:14px;font-weight:600}
label small{font-weight:400;color:var(--muted)}
input,select,textarea{font:16px/1.5 var(--sans);color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:6px;padding:11px 12px;width:100%}
textarea{min-height:110px;resize:vertical}
.consent{flex-direction:row;align-items:flex-start;gap:10px;font-weight:400;color:var(--muted)}
.consent input{width:auto;margin-top:5px}
.note{font-size:14px;color:var(--muted)}
.ok{background:var(--seal-soft);border-radius:6px;padding:12px 14px;font-size:15px}
.side{display:flex;flex-direction:column;gap:22px}
.qr{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:20px;display:flex;flex-direction:column;align-items:center;gap:12px;text-align:center}
.qr img{width:200px;max-width:100%;border-radius:4px;background:#fff}
.idline{display:flex;gap:8px;align-items:center;flex-wrap:wrap;justify-content:center}
.idline code{font:600 16px/1 ui-monospace,SFMono-Regular,Menlo,monospace;background:var(--paper);padding:6px 10px;border-radius:4px;border:1px solid var(--line);user-select:all}
.copy{font:14px var(--sans);border:1px solid var(--line);background:transparent;color:var(--ink);border-radius:6px;padding:6px 10px;cursor:pointer}
dl{margin:0;display:grid;gap:10px}
dt{font-size:13px;color:var(--muted)} dd{margin:0;font-variant-numeric:tabular-nums;user-select:all}

footer{border-top:1px solid var(--line);padding-block:36px 44px;font-size:14px;color:var(--muted)}
.foot{display:grid;gap:16px}
@media (min-width:760px){.foot{grid-template-columns:1fr auto}}
.foot a{color:var(--muted)}
.footid{display:flex;gap:16px;align-items:flex-start}
.iaa-foot{width:56px;height:auto;flex-shrink:0}
.tm{font-size:12px;margin-top:6px;max-width:52em}
.foot .links{display:flex;gap:18px;flex-wrap:wrap}
.disclaimer{margin-top:18px;font-size:13px;max-width:60em}

/* mobile action bar */
.mbar{position:fixed;left:0;right:0;bottom:0;z-index:20;display:grid;grid-template-columns:1fr 1fr;gap:10px;padding:10px 16px calc(10px + env(safe-area-inset-bottom,0px));background:var(--surface);border-top:1px solid var(--line)}
.mbar .btn{padding:12px 10px;font-size:15px}
@media (min-width:860px){.mbar{display:none}}

/* wechat dialog */
.dlg{position:fixed;inset:0;background:rgba(0,0,0,.5);display:grid;place-items:center;z-index:30;padding:20px}
.dlg .qr{max-width:320px;width:100%}
[hidden]{display:none!important}


.nav-cta{color:var(--ink)!important;font-weight:600}
.lang a{display:block;padding:6px 12px;text-decoration:none;color:var(--muted)}
.lang .on{background:var(--ink);color:var(--paper)}
nav a[aria-current="page"]{color:var(--ink);font-weight:600}
.page-hero{padding-block:56px 40px;border-bottom:1px solid var(--line)}
@media (min-width:860px){.page-hero{padding-block:80px 56px}}
.page-hero h1{font-size:clamp(30px,4.4vw,46px);margin-top:12px;max-width:22em}
.page-hero .lede{margin-top:18px;font-size:18px;color:var(--muted);max-width:40em}
.crumb{font-size:13px;color:var(--muted)} .crumb a{color:var(--muted)}
.cols{display:grid;gap:48px}
@media (min-width:900px){.cols{grid-template-columns:1fr 1fr;gap:64px}}
.prose h2{font-size:clamp(22px,2.8vw,28px);margin-bottom:16px}
.prose p{max-width:40em}
.prose p + p{margin-top:14px}
.ticks{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.ticks li{padding-left:22px;position:relative}
.ticks li::before{content:"";position:absolute;left:2px;top:.72em;width:8px;height:8px;border-radius:50%;background:var(--seal)}
.src{font-size:14px;color:var(--muted);margin-top:14px}
.src a{color:var(--focus)}
.tips{background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--seal);border-radius:6px;padding:24px 26px}
.tips h2{font-size:22px;margin-bottom:14px}
.qa{border-top:1px solid var(--line)}
.qa details{border-bottom:1px solid var(--line);padding-block:18px}
.qa summary{cursor:pointer;font-family:var(--serif);font-weight:700;font-size:18px;list-style:none;display:flex;justify-content:space-between;gap:16px}
.qa summary::after{content:"+";color:var(--muted);font-family:var(--sans)}
.qa details[open] summary::after{content:"−"}
.qa details p{margin-top:10px;color:var(--muted);max-width:44em}
.band-cta{background:var(--slate);color:var(--slate-ink);border-radius:8px;padding:32px;display:grid;gap:18px;align-items:center}
@media (min-width:760px){.band-cta{grid-template-columns:1fr auto}}
.band-cta p{color:var(--slate-muted)}
.band-cta .btn-primary{background:var(--slate-ink);color:var(--slate);border-color:var(--slate-ink)}
.band-cta .btn-ghost{color:var(--slate-ink);border-color:var(--slate-muted)}
.band-cta .cta{margin-top:0}
.people{display:grid;gap:40px}
@media (min-width:760px){.people{grid-template-columns:1fr 1fr}}
.person{display:grid;gap:18px;align-content:start}
.person img{width:100%;max-width:360px;aspect-ratio:4/5;object-fit:cover;border-radius:4px}
.person h3{font-size:24px}
.person .role{color:var(--muted);font-size:15px}
.cred{display:flex;gap:16px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:6px;padding:16px 18px;max-width:420px}
.cred img{width:64px;height:auto;aspect-ratio:auto;border-radius:0}
.cred b{font-family:var(--serif)} .cred span{display:block;font-size:14px;color:var(--muted)} .cred a{font-size:13px;color:var(--focus)}
.soon{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:1px 10px;white-space:nowrap}
.legal h2{font-size:22px;margin:32px 0 12px}
.tablewrap{overflow-x:auto;border:1px solid var(--line);border-radius:8px;background:var(--surface)}
.cmp{border-collapse:collapse;width:100%;min-width:640px;font-size:15px}
.cmp th,.cmp td{text-align:left;vertical-align:top;padding:14px 18px;border-bottom:1px solid var(--line)}
.cmp thead th{font-family:var(--serif);font-size:17px;background:var(--paper)}
.cmp tbody th{font-weight:600;color:var(--muted);width:18%;font-size:14px}
.cmp tr:last-child th,.cmp tr:last-child td{border-bottom:0}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}
.legal ul{padding-left:20px;display:grid;gap:8px;max-width:44em}