:root{
  --paper:#F5F6F4; --ink:#1C2329; --ink-2:#4A545C; --fir:#2E4B3F; --fir-d:#223A31;
  --brass:#A8864F; --rule:#CDD2CD; --white:#FFFFFF;
  --serif:"Spectral",Georgia,"Noto Serif SC",serif;
  --sans:"IBM Plex Sans",system-ui,-apple-system,"Segoe UI","Noto Sans SC",sans-serif;
  --wrap:1180px; --gut:clamp(1.25rem,4vw,2.5rem);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:400 1.0625rem/1.6 var(--sans)}
img{max-width:100%;height:auto;display:block}
a{color:var(--fir);text-underline-offset:.18em}
a:hover{color:var(--fir-d)}
:focus-visible{outline:3px solid var(--brass);outline-offset:3px}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:50}
.skip:focus{left:1rem}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gut)}

h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.12;letter-spacing:-.01em;margin:0 0 .6em}
h1{font-size:clamp(2.2rem,4.4vw,3.5rem);max-width:19ch}
h2{font-size:clamp(1.7rem,3.2vw,2.4rem);max-width:30ch}
h3{font-size:1.3rem;line-height:1.25}
p{margin:0 0 1em;max-width:66ch}
.lede{font-size:1.2rem;color:var(--ink-2);max-width:56ch}

/* header */
.site-head{background:var(--paper);border-bottom:1px solid var(--rule);position:sticky;top:0;z-index:20}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:1rem;min-height:72px}
.brand{padding:.6rem 0}.brand img{width:150px}
.nav{display:flex;align-items:center;gap:1.4rem;font-size:.97rem}
.nav a{color:var(--ink);text-decoration:none}
.nav a[aria-current=page]{color:var(--fir);box-shadow:inset 0 -2px var(--fir)}
.nav a:hover{color:var(--fir)}
.btn{display:inline-block;background:var(--fir);color:#fff!important;text-decoration:none;padding:.78rem 1.25rem;border-radius:2px;font-weight:500;border:1px solid var(--fir);cursor:pointer;font:inherit}
.btn:hover{background:var(--fir-d)}
.btn.ghost{background:transparent;color:var(--fir)!important}
.btn.ghost:hover{background:var(--white)}
.nav .btn{padding:.55rem 1rem}
.menu-toggle{display:none}
.menu-toggle summary{list-style:none;cursor:pointer;padding:.5rem .8rem;border:1px solid var(--ink);border-radius:2px}
.menu-toggle summary::-webkit-details-marker{display:none}
.mobile-nav{position:absolute;left:0;right:0;top:72px;background:var(--paper);border-bottom:1px solid var(--rule);padding:1rem var(--gut) 1.5rem;display:grid;gap:.2rem}
.mobile-nav a{color:var(--ink);text-decoration:none;padding:.55rem 0;border-bottom:1px solid var(--rule)}
.lang{font-size:.9rem;color:var(--ink-2)}

/* hero */
.hero{padding:clamp(2.5rem,6vw,5rem) 0 0;overflow:hidden}
.hero-grid{display:grid;grid-template-columns:.95fr 1.05fr;gap:2.5rem;align-items:end}
.hero-copy{padding-bottom:clamp(2.5rem,6vw,5rem)}
.hero .lede{margin-bottom:1.6rem}
.ctas{display:flex;flex-wrap:wrap;gap:.8rem}
.hero-art{align-self:end}
.elev{width:100%;height:auto;color:var(--ink);display:block}
.elev .l{fill:none;stroke:currentColor;stroke-width:1.2}
.elev .t{fill:none;stroke:var(--brass);stroke-width:1}
.elev text{font:500 11px var(--sans);fill:var(--brass);letter-spacing:.04em}
.portrait{position:relative;margin-left:auto;width:min(330px,62%);z-index:1}
.lang-line{font-size:.95rem;color:var(--ink-2);margin-top:1.2rem}
.lang-line a{margin-left:.3rem}

.band{margin:2.2rem 0 0;border:1px solid var(--ink);background:var(--rule)}
.band img{width:100%;aspect-ratio:16/7;object-fit:cover}
.sec>.wrap:first-child>.band:first-child{margin:0 0 2.5rem}

.portrait-photo{margin:0;border:1px solid var(--ink);max-width:460px;justify-self:end}
.portrait-photo img{width:100%;aspect-ratio:4/5;object-fit:cover}
.intro-photo{align-items:center}
@media (max-width:900px){.portrait-photo{justify-self:stretch;max-width:none}.portrait-photo img{aspect-ratio:4/3}}

/* stats */
.stats{border-top:1px solid var(--ink);border-bottom:1px solid var(--rule);background:var(--white)}
.stats ul{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr)}
.stats li{padding:1.4rem 1.2rem 1.3rem;border-left:1px solid var(--rule)}
.stats li:first-child{border-left:0;padding-left:0}
.stats b{display:block;font:500 1.9rem/1.1 var(--serif)}
.stats span{font-size:.92rem;color:var(--ink-2)}

/* sections */
.sec{padding:clamp(3rem,7vw,5.5rem) 0}
.sec.alt{background:var(--white);border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.cols3{display:grid;grid-template-columns:repeat(3,1fr);margin-top:2rem}
.cols3>div{padding:0 1.6rem;border-left:1px solid var(--rule)}
.cols3>div:first-child{padding-left:0;border-left:0}
.cols3 h3{margin-top:.9rem}
.cols3 svg{width:44px;height:44px;color:var(--fir)}
.more{font-weight:500}

/* title-block cards */
.sheets{display:grid;grid-template-columns:repeat(3,1fr);gap:1.4rem;margin-top:2rem}
.sheet{background:var(--white);border:1px solid var(--ink);position:relative}
.sheet .draw{height:150px;border-bottom:1px solid var(--ink);color:var(--ink-2);display:flex;align-items:center;justify-content:center;background:
  repeating-linear-gradient(0deg,transparent 0 23px,#E8EBE8 23px 24px),repeating-linear-gradient(90deg,transparent 0 23px,#E8EBE8 23px 24px)}
.sheet .draw svg{width:70%;height:120px}
.tb{display:grid;grid-template-columns:1fr auto;font-size:.88rem}
.tb div{padding:.55rem .8rem;border-top:1px solid var(--rule)}
.tb div:nth-child(odd){border-right:1px solid var(--rule)}
.tb .addr{grid-column:1/-1;border-top:0;font:500 1.05rem var(--serif)}
.tb small{display:block;color:var(--ink-2);font-size:.75rem}
.note{font-size:.88rem;color:var(--ink-2);margin-top:1rem}

/* lists, phases, tips */
.phases{display:grid;gap:0;margin-top:2.5rem;border-top:1px solid var(--ink)}
.phase{display:grid;grid-template-columns:220px 1fr;gap:2rem;padding:1.8rem 0;border-bottom:1px solid var(--rule)}
.phase .num{font:500 1rem var(--serif);color:var(--brass)}
.phase h3{margin:.2rem 0 0}
.phase ul{margin:0;padding-left:1.1rem}
.phase li{margin-bottom:.5rem}
.plain{padding-left:1.1rem}
.plain li{margin-bottom:.45rem;max-width:66ch}
.tips{display:grid;grid-template-columns:repeat(2,1fr);gap:2.4rem 3rem;margin-top:1.5rem}
.tips h3{border-top:1px solid var(--ink);padding-top:.9rem}
.tips ul{padding-left:1.1rem;margin:0}
.tips li{margin-bottom:.6rem}
.two{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.panel{background:var(--white);border:1px solid var(--rule);padding:1.6rem}
.steps{counter-reset:s;list-style:none;padding:0;margin:1.5rem 0 0}
.steps li{counter-increment:s;position:relative;padding:0 0 1.2rem 3rem;max-width:70ch}
.steps li::before{content:counter(s);position:absolute;left:0;top:-.15rem;width:2rem;height:2rem;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;font:500 .95rem var(--serif)}
table.fig{border-collapse:collapse;width:100%;font-size:.97rem;margin:1rem 0}
table.fig td,table.fig th{text-align:left;padding:.6rem .7rem;border-bottom:1px solid var(--rule);vertical-align:top}
table.fig th{font-weight:500;color:var(--ink-2);width:42%}

/* forms & calculators */
form{display:grid;gap:1rem}
label{display:grid;gap:.35rem;font-size:.95rem;font-weight:500}
input,select,textarea{font:inherit;padding:.7rem .8rem;border:1px solid #9AA39C;border-radius:2px;background:#fff;color:var(--ink);width:100%}
textarea{min-height:120px}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.check{display:flex;gap:.6rem;align-items:flex-start;font-weight:400}
.check input{width:auto;margin-top:.3rem}
.fine{font-size:.85rem;color:var(--ink-2)}
.form-ok{display:none;background:#E7EFEA;border-left:3px solid var(--fir);padding:1rem 1.2rem}
.form-err{display:none;color:#8A2B22}
.qr{display:flex;gap:1rem;align-items:center;margin-top:1rem}
.qr img{width:110px;border:1px solid var(--rule)}
.calc{display:grid;grid-template-columns:1fr 1fr;gap:2rem;align-items:start}
.out{background:var(--white);border:1px solid var(--ink);padding:1.4rem 1.6rem}
.out dl{display:grid;grid-template-columns:1fr auto;gap:.55rem 1rem;margin:0}
.out dt{color:var(--ink-2)}
.out dd{margin:0;font-weight:500;text-align:right;font-variant-numeric:tabular-nums}
.out .big{font:500 2rem var(--serif);margin:.2rem 0 1rem}
.flag{font-size:.9rem;padding:.6rem .8rem;background:#F4EEE3;border-left:3px solid var(--brass);margin-top:1rem}

/* footer */
.site-foot{background:var(--ink);color:#D9DDD9;padding:3rem 0 6rem;font-size:.93rem}
.site-foot a{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:2rem}
.foot-grid ul{list-style:none;margin:0;padding:0}
.foot-grid li{margin-bottom:.4rem}
.site-foot .legal{border-top:1px solid #3A444C;margin-top:2rem;padding-top:1.2rem;font-size:.82rem;color:#AEB5AF}
.remax{background:#fff;display:inline-block;padding:.6rem .8rem;margin-top:1rem}
.remax img{width:130px}

/* mobile bar */
.mbar{display:none}

@media (max-width:900px){
  .nav{display:none}.menu-toggle{display:block}
  .hero-grid,.two,.calc{grid-template-columns:1fr}
  .hero-copy{padding-bottom:.5rem}
  .stats ul{grid-template-columns:1fr 1fr}
  .stats li:nth-child(3){border-left:0;padding-left:0}
  .stats li{border-top:1px solid var(--rule)}
  .cols3,.sheets,.tips{grid-template-columns:1fr}
  .cols3>div{padding:1.4rem 0;border-left:0;border-top:1px solid var(--rule)}
  .cols3>div:first-child{border-top:0}
  .phase{grid-template-columns:1fr;gap:.6rem}
  .foot-grid{grid-template-columns:1fr}
  .row2{grid-template-columns:1fr}
  .mbar{display:grid;grid-template-columns:repeat(3,1fr);position:fixed;left:0;right:0;bottom:0;z-index:30;background:var(--ink);border-top:1px solid #000}
  .mbar a{color:#fff;text-align:center;padding:.9rem .4rem;text-decoration:none;font-weight:500;border-left:1px solid #3A444C}
  .mbar a:first-child{border-left:0}
  .mbar a:last-child{background:var(--fir)}
}
@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
/* language switch + Chinese mirror */
.lang-switch{font-size:.9rem;color:var(--ink-2);text-decoration:none;border-bottom:1px solid var(--rule);white-space:nowrap}
.lang-switch:hover{color:var(--fir);border-color:var(--fir)}
.mobile-nav .lang-switch{border:0}
html[lang^=zh]{--serif:"Noto Serif SC","Songti SC",Spectral,serif;--sans:"Noto Sans SC","PingFang SC","Microsoft YaHei","IBM Plex Sans",system-ui,sans-serif}
html[lang^=zh] body{line-height:1.8;letter-spacing:.01em}
html[lang^=zh] h1,html[lang^=zh] h2,html[lang^=zh] h3{letter-spacing:.02em;line-height:1.3;font-weight:600}
html[lang^=zh] .lede{line-height:1.85}