/* Layout concept: a fixed 3D scalp of hair strands lives in the right half of the screen (the top band on
   phones); the copy scrolls past it in a narrow left column and each section turns the head, lights a zone
   in cobalt, and runs one of three animations. Porcelain ground, graphite ink, one cobalt accent, a serif
   voice with italic emphasis, hairline rules and serif numerals instead of tiles or cards. Single light tone. */
:root{
  color-scheme: light;
  --paper:#F4F5F3; --paper-2:#ECEEEA; --white:#FFFFFF;
  --ink:#1A1C20; --ink-2:#4A5058; --mute:#7B828B;
  --cobalt:#213F9E; --cobalt-deep:#172E75; --cobalt-soft:#DCE3F5;
  --warm:#9E8061;
  --line:rgba(26,28,32,.16); --line-2:rgba(26,28,32,.09);
  --f-display:"Instrument Serif","Noto Serif SC",Georgia,"Songti SC",serif;
  --f-body:"Manrope","Noto Sans SC",-apple-system,"PingFang SC",system-ui,sans-serif;
  --f-cjk-display:"Noto Serif SC","Songti SC","STSong",serif;
  --f-cjk:"Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --gutter:clamp(20px,5vw,72px);
  --pad-l:max(var(--gutter),env(safe-area-inset-left,0px));
  --pad-r:max(var(--gutter),env(safe-area-inset-right,0px));
  --ease:cubic-bezier(.16,1,.3,1);
  --z-canvas:1; --z-content:2; --z-nav:10; --z-menu:15; --z-loader:20;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--f-body);font-size:16.5px;line-height:1.7;overflow-x:hidden;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0 0 auto;height:env(safe-area-inset-top,0px);z-index:var(--z-nav);background:var(--paper)}
a{color:inherit}
img,svg{max-width:100%}
:focus-visible{outline:2px solid var(--cobalt);outline-offset:4px;border-radius:2px}
::selection{background:var(--cobalt);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-thumb{background:#D5D9D4;border-radius:8px;border:2px solid var(--paper)}
::-webkit-scrollbar-track{background:var(--paper)}
input,button,textarea{font:inherit;color:inherit}

html[data-lang="zh"] .en{display:none!important}
html[data-lang="en"] .zh{display:none!important}
html[data-lang="zh"] body{font-family:var(--f-cjk);line-height:1.9;font-size:16px}
html[data-lang="zh"] h1,html[data-lang="zh"] h2,html[data-lang="zh"] h3,html[data-lang="zh"] .serif{font-family:var(--f-cjk-display);font-weight:600;letter-spacing:.02em}
html[data-lang="zh"] h1{line-height:1.14;font-size:clamp(2.4rem,5.2vw,4.2rem)}
html[data-lang="zh"] em,html[data-lang="zh"] .em,html[data-lang="zh"] .quote h2{font-style:normal}
html[data-lang="zh"] p{max-width:38em}
html[data-lang="zh"] .num,html[data-lang="zh"] .k,html[data-lang="zh"] .cap{letter-spacing:.14em}

#gl{position:fixed;inset:0;width:100%;height:100%;z-index:var(--z-canvas);display:block;background:var(--paper)}
#gl-fallback{position:fixed;inset:0;z-index:var(--z-canvas);background:radial-gradient(circle at 75% 50%,var(--cobalt-soft),var(--paper) 55%)}

/* ---------- loader ---------- */
#loader{position:fixed;inset:0;z-index:var(--z-loader);background:var(--paper);display:grid;place-items:center;transition:opacity .9s var(--ease),visibility .9s}
#loader.done{opacity:0;visibility:hidden}
#loader .in{display:grid;justify-items:center;gap:18px;width:min(280px,60vw)}
#loader .word{font:italic 400 34px/1 var(--f-display);color:var(--ink);letter-spacing:-.01em}
#loader .track{width:100%;height:1px;background:var(--line)}
#loader .track i{display:block;height:1px;background:var(--cobalt);transform:scaleX(0);transform-origin:left}

/* ---------- nav ---------- */
.nav{position:fixed;top:env(safe-area-inset-top,0px);left:0;right:0;z-index:var(--z-nav);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px var(--pad-r) 14px var(--pad-l);transition:padding .4s var(--ease),background .4s,border-color .4s;border-bottom:1px solid transparent;background:linear-gradient(rgba(244,245,243,.92),rgba(244,245,243,0))}
.nav.scrolled{padding-block:10px;background:rgba(244,245,243,.86);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom-color:var(--line-2)}
.nav .mark{text-decoration:none;display:inline-flex;align-items:baseline;gap:12px}
.nav .mark b{font:italic 400 26px/1 var(--f-display);color:var(--ink);letter-spacing:-.01em}
.nav .mark small{font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--ink-2);font-weight:600}
html[data-lang="zh"] .nav .mark small{text-transform:none;letter-spacing:.12em}
.nav ul{list-style:none;margin:0;padding:0;display:flex;gap:clamp(16px,2.4vw,34px);align-items:center}
.nav ul a{text-decoration:none;font-size:13px;font-weight:600;letter-spacing:.06em;color:var(--ink-2);transition:color .3s;padding:6px 0;border-bottom:1px solid transparent}
.nav ul a:hover,.nav ul a.is-current{color:var(--cobalt);border-bottom-color:var(--cobalt)}
.lang{appearance:none;background:none;border:0;padding:6px 0;color:var(--ink);font:italic 400 16px/1 var(--f-display);cursor:pointer;letter-spacing:.02em}
.lang:hover{color:var(--cobalt)}
.nav .menu{display:none;appearance:none;background:none;border:1px solid var(--line);border-radius:2px;width:42px;height:42px;cursor:pointer;place-items:center}
.nav .menu span{display:block;width:18px;height:1.5px;background:var(--ink);box-shadow:0 -6px 0 var(--ink),0 6px 0 var(--ink)}
#menu{position:fixed;inset:0;z-index:var(--z-menu);background:var(--paper);display:grid;grid-template-rows:auto 1fr auto;padding:calc(18px + env(safe-area-inset-top,0px)) var(--pad-r) calc(24px + env(safe-area-inset-bottom,0px)) var(--pad-l);transform:translateY(-100%);opacity:0;transition:transform .6s var(--ease),opacity .4s;visibility:hidden}
#menu.open{transform:none;opacity:1;visibility:visible}
#menu .top{display:flex;justify-content:space-between;align-items:center}
#menu .top b{font:italic 400 26px/1 var(--f-display)}
#menu .close{appearance:none;background:none;border:1px solid var(--line);border-radius:2px;width:42px;height:42px;cursor:pointer;font-size:22px;line-height:1;color:var(--ink)}
#menu .list{display:grid;align-content:center;gap:0}
#menu .list a{text-decoration:none;display:grid;grid-template-columns:3ch 1fr;gap:16px;align-items:baseline;padding:16px 0;border-top:1px solid var(--line);font:400 clamp(1.5rem,6vw,2rem)/1.1 var(--f-display)}
#menu .list a i{font-style:italic;color:var(--cobalt);font-size:1rem}
html[data-lang="zh"] #menu .list a{font-family:var(--f-cjk-display);font-weight:600}
#menu .rest{display:flex;justify-content:space-between;align-items:center}
@media (max-width:860px){.nav ul{display:none}.nav .menu{display:grid}.nav .mark small{display:none}}

/* ---------- shell ---------- */
main{position:relative;z-index:var(--z-content)}
.wrap{width:100%;max-width:1280px;margin-inline:auto;padding-left:var(--pad-l);padding-right:var(--pad-r)}
.spread{min-height:100svh;display:grid;align-items:center;padding-block:clamp(56px,9vh,110px);position:relative}
.spread .wrap{position:relative;z-index:1}
.big{position:absolute;left:calc(var(--pad-l) - .06em);top:clamp(28px,6vh,72px);font:italic 400 clamp(9rem,21vw,19rem)/1 var(--f-display);color:transparent;-webkit-text-stroke:1px rgba(33,63,158,.2);letter-spacing:-.05em;pointer-events:none;user-select:none;z-index:0}
.quote .big{top:0;font-size:clamp(14rem,30vw,28rem);-webkit-text-stroke:1px rgba(33,63,158,.16)}
.rail{position:fixed;left:calc(var(--pad-l)*.5);top:50%;transform:translateY(-50%);height:44vh;width:1px;background:var(--line);z-index:var(--z-content)}
.rail i{position:absolute;left:0;top:0;width:1px;background:var(--cobalt);transform-origin:top;transform:scaleY(var(--p,0))}
.rail span{position:absolute;left:10px;top:calc(var(--at)*100%);transform:translateY(-50%);font:italic 400 12px/1 var(--f-display);color:var(--mute);transition:color .3s}
.rail span::before{content:"";position:absolute;left:-13px;top:50%;width:7px;height:1px;background:var(--line)}
.rail span.is-on{color:var(--cobalt)}
.rail{transition:opacity .5s}
.rail.is-end{opacity:0}
@media (max-width:1100px){.rail{display:none}}
.copy{width:min(560px,46%);display:grid;gap:22px;align-content:center}
.copy.wide{width:min(680px,52%)}
h1,h2,h3{font-family:var(--f-display);font-weight:400;margin:0;text-wrap:balance;letter-spacing:-.012em}
h1{font-size:clamp(2.8rem,6.2vw,5.4rem);line-height:1.0}
h2{font-size:clamp(2rem,3.6vw,3.2rem);line-height:1.08}
h3{font-size:clamp(1.25rem,1.7vw,1.5rem);line-height:1.25}
em,.em{font-style:italic;color:var(--cobalt)}
p{margin:0;max-width:60ch;text-wrap:pretty}
.lede{font-size:clamp(16.5px,1.25vw,18.5px);color:var(--ink-2);line-height:1.7}
.muted{color:var(--ink-2)}
.small{font-size:14px;line-height:1.65}
.num{font:italic 400 1.35rem/1 var(--f-display);color:var(--cobalt);letter-spacing:.02em}
.k{font:700 11.5px/1 var(--f-body);letter-spacing:.18em;text-transform:uppercase;color:var(--ink-2)}
.btn{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font:600 14px/1.2 var(--f-body);letter-spacing:.05em;padding:15px 22px;border-radius:3px;background:var(--cobalt);color:#fff;border:1px solid var(--cobalt);transition:background .3s,color .3s,transform .5s var(--ease),box-shadow .5s;cursor:pointer}
.btn:hover{background:var(--cobalt-deep);border-color:var(--cobalt-deep);transform:translateY(-2px);box-shadow:0 14px 30px -18px rgba(23,46,117,.6)}
.btn.ghost{background:transparent;color:var(--cobalt)}
.btn.ghost:hover{background:var(--cobalt-soft);color:var(--cobalt-deep)}
.btn.white{background:#fff;color:var(--cobalt);border-color:#fff}
.btn.white:hover{background:var(--paper);color:var(--cobalt-deep);border-color:var(--paper)}
.btn.cob{background:var(--cobalt);border-color:var(--cobalt);color:#fff}
.btn.cob:hover{background:#2C4FBF;border-color:#2C4FBF}
.btn svg{width:17px;height:17px;flex:none}
.cta{display:flex;gap:12px;flex-wrap:wrap;align-items:center}
.arrow{text-decoration:none;color:var(--cobalt);font:italic 400 1.05rem/1 var(--f-display);display:inline-flex;gap:8px;align-items:center}
.arrow svg{width:16px;height:16px;transition:transform .4s var(--ease)}
.arrow:hover svg{transform:translateX(4px)}

/* reveal */
.rv.pre{opacity:0;transform:translateY(18px)}
.rv.in{opacity:1;transform:none;transition:opacity 1s var(--ease),transform 1s var(--ease)}
.rv.in.d1{transition-delay:.1s}.rv.in.d2{transition-delay:.2s}.rv.in.d3{transition-delay:.3s}

/* scroll-in: words rise out of a masked line, lists cascade, rules draw themselves */
.sw{display:inline-block;overflow:hidden;vertical-align:bottom;padding:.14em .05em .1em;margin:-.14em -.05em -.1em}
.sw>i{display:inline-block;font-style:inherit;color:inherit;transform:none;transition:transform 1.1s var(--ease);transition-delay:calc(var(--i,0)*42ms)}
.rv.pre.ws{opacity:1;transform:none}
.rv.pre .sw>i{transform:translateY(112%)}
.rv.in .sw>i{transform:none}
.rv.pre.stag{opacity:1;transform:none}
.rv.pre.stag>.st{opacity:0;transform:translateY(16px)}
.rv.in.stag>.st{opacity:1;transform:none;transition:opacity .9s var(--ease),transform .9s var(--ease),padding-left .5s var(--ease),color .3s,background .4s;transition-delay:calc(var(--i,0)*80ms),calc(var(--i,0)*80ms),0s,0s,0s}
.rv.pre.stag>.st.ws,.rv.in.stag>.st.ws{opacity:1;transform:none}
.rows.stag>li{border-top-color:transparent;position:relative}
.rows.stag>li::after{content:"";position:absolute;left:0;right:0;top:-1px;height:1px;background:var(--line);transform-origin:left;transform:scaleX(1);transition:transform 1.1s var(--ease);transition-delay:calc(var(--i,0)*80ms)}
.rows.stag.pre>li::after{transform:scaleX(0)}
.ch .num{position:relative;border-bottom-color:transparent}
.ch .num::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;background:var(--line);transform-origin:left;transform:scaleX(1);transition:transform 1.2s var(--ease) .1s}
.ch.pre .num::after{transform:scaleX(0)}
.big{transition:opacity 1.4s var(--ease),transform 1.4s var(--ease)}
.spread.pre .big{opacity:0;transform:translateX(-28px)}
/* scroll-out: what was read slips upward and fades; slow appear and zoom variants */
.rv.out{opacity:0;transform:translateY(-16px);transition:opacity .55s var(--ease),transform .55s var(--ease)}
.rv.out.ws,.rv.out.stag{opacity:1;transform:none}
.rv.out .sw>i{transform:translateY(-112%);transition:transform .6s var(--ease);transition-delay:calc(var(--i,0)*18ms)}
.rv.out.stag>.st{opacity:0;transform:translateY(-10px);transition:opacity .45s var(--ease),transform .45s var(--ease);transition-delay:calc(var(--i,0)*30ms)}
.rv.out.stag>.st.ws{opacity:1;transform:none}
.rows.stag.out>li::after{transform:scaleX(0);transform-origin:right}
.ch.out .num::after{transform:scaleX(0);transform-origin:right}
.rv.slow.pre{transform:none;filter:blur(6px)}
.rv.slow.in{filter:none;transition:opacity 1.6s var(--ease),filter 1.6s var(--ease),transform 1.6s var(--ease)}
.rv.pre.stag>.st.slow{transform:none;filter:blur(6px)}
.rv.in.stag>.st.slow{filter:none;transition:opacity 1.5s var(--ease),filter 1.5s var(--ease),transform 1.5s var(--ease)}
.rv.zoom.pre{transform:scale(.965) translateY(8px)}
.rv.zoom.in{transition:opacity 1.2s var(--ease),transform 1.2s var(--ease)}
.hero .copy{opacity:calc(1 - var(--sp,0)*0.9);transform:translateY(calc(var(--sp,0)*-48px))}

/* ---------- hero ---------- */
.hero{padding-top:calc(96px + 6vh)}
.hero .copy{gap:26px}
.hero h1{max-width:11em}
.hero .lede{max-width:32em}
.index{list-style:none;margin:10px 0 0;padding:0;display:grid}
.index li a{display:grid;grid-template-columns:3ch 1fr auto;gap:14px;align-items:baseline;text-decoration:none;padding:11px 0;border-top:1px solid var(--line);font-size:15px;color:var(--ink);transition:color .3s,padding-left .5s var(--ease)}
.index li:last-child a{border-bottom:1px solid var(--line)}
.index li a i{font:italic 400 1rem/1 var(--f-display);color:var(--cobalt)}
.index li a span.sub{font-size:12.5px;color:var(--mute);letter-spacing:.04em}
.index li a:hover,.index li a.is-current{color:var(--cobalt);padding-left:6px}
.hint{font:italic 400 15px/1 var(--f-display);color:var(--ink-2);display:inline-flex;align-items:center;gap:12px}
.hint::after{content:"";width:42px;height:1px;background:var(--ink-2);transform-origin:left;animation:draw 2.2s var(--ease) infinite}
@keyframes draw{0%{transform:scaleX(0)}55%{transform:scaleX(1)}100%{transform:scaleX(1);opacity:0}}

/* ---------- chapter blocks ---------- */
.ch{display:grid;gap:12px}
.ch .num{padding-bottom:12px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:baseline}
.ch .num small{font:700 11px/1 var(--f-body);letter-spacing:.18em;text-transform:uppercase;color:var(--mute)}
html[data-lang="zh"] .ch .num small{text-transform:none;letter-spacing:.14em}
.ch h2{margin-top:6px}

/* ruled rows with serif numerals */
.rows{list-style:none;margin:0;padding:0;counter-reset:row}
.rows li{display:grid;grid-template-columns:2.4ch 1fr;gap:4px 16px;padding:14px 0;border-top:1px solid var(--line);counter-increment:row;align-items:baseline;transition:background .4s,padding-left .5s var(--ease)}
.rows li::before{content:counter(row,decimal-leading-zero);font:italic 400 1rem/1.2 var(--f-display);color:var(--cobalt);grid-row:span 3}
.rows li b{font-family:var(--f-display);font-weight:400;font-size:1.25rem;letter-spacing:-.005em;line-height:1.25}
html[data-lang="zh"] .rows li b{font-family:var(--f-cjk-display);font-weight:600;font-size:1.15rem}
.rows li span.meta{font-size:12.5px;letter-spacing:.06em;color:var(--mute);font-variant-numeric:tabular-nums}
.rows li p{font-size:15px;color:var(--ink-2);grid-column:2}
.rows li:last-child{border-bottom:1px solid var(--line)}
.rows li.is-hl{background:linear-gradient(90deg,var(--cobalt-soft),transparent 80%);padding-left:10px;margin-left:-10px}
.rows li.ours b{color:var(--cobalt)}
.rows li.ours::before{content:"\2192"}

/* situation picker: ruled radio rows */
.sits{display:grid;margin:0;padding:0}
.sits button{appearance:none;display:grid;grid-template-columns:16px 1fr;gap:4px 16px;align-items:baseline;text-align:left;padding:15px 0;border:0;border-top:1px solid var(--line);background:none;cursor:pointer;transition:padding-left .5s var(--ease),color .3s}
.sits button:last-child{border-bottom:1px solid var(--line)}
.sits button i{width:12px;height:12px;border:1.5px solid var(--cobalt);display:block;transform:translateY(1px);transition:background .3s}
.sits button b{font-family:var(--f-display);font-weight:400;font-size:1.3rem;letter-spacing:-.005em;line-height:1.2}
html[data-lang="zh"] .sits button b{font-family:var(--f-cjk-display);font-weight:600;font-size:1.15rem}
.sits button span{grid-column:2;font-size:14px;color:var(--ink-2)}
.sits button:hover{padding-left:6px;color:var(--cobalt)}
.sits button[aria-pressed="true"]{color:var(--cobalt)}
.sits button[aria-pressed="true"] i{background:var(--cobalt)}

/* figures */
.fig{border:1px solid var(--line);padding:16px 16px 12px;background:rgba(255,255,255,.55);display:grid;gap:8px}
.fig svg{display:block;width:100%;height:auto}
.cap{font:italic 400 13.5px/1.4 var(--f-display);color:var(--ink-2)}
.figtxt{font-family:var(--f-body);font-size:11.5px;fill:var(--ink-2);font-weight:600;letter-spacing:.04em}
html[data-lang="zh"] .figtxt{font-family:var(--f-cjk);font-weight:500}
.source{font:italic 400 13.5px/1.4 var(--f-display);color:var(--cobalt)}
.source a{color:inherit}

/* checks */
.ticks{list-style:none;margin:0;padding:0;display:grid}
.ticks li{display:grid;grid-template-columns:14px 1fr;gap:14px;align-items:baseline;padding:10px 0;border-top:1px solid var(--line-2);font-size:15px}
.ticks li::before{content:"";width:8px;height:8px;background:var(--cobalt);transform:translateY(-1px)}
.ticks.wait li::before{background:none;border:1.5px solid var(--warm);width:7px;height:7px}
.two{display:grid;grid-template-columns:1fr 1fr;gap:28px}
@media (max-width:560px){.two{grid-template-columns:1fr}}

/* FUE / FUT */
.vs{display:grid;grid-template-columns:1fr 1fr;gap:0}
.vs>div{padding:4px 22px 4px 0;display:grid;gap:10px;align-content:start}
.vs>div+div{border-left:1px solid var(--line);padding-left:22px;padding-right:0}
.vs small{font:700 11px/1 var(--f-body);letter-spacing:.2em;text-transform:uppercase;color:var(--mute)}
.vs b{font:400 1.6rem/1.1 var(--f-display)}
html[data-lang="zh"] .vs b{font-family:var(--f-cjk-display);font-weight:600;font-size:1.3rem}
.vs ul{margin:4px 0 0;padding:0;list-style:none;display:grid;gap:6px;font-size:14.5px;color:var(--ink-2)}
.vs ul li{padding-left:14px;position:relative}
.vs ul li::before{content:"";position:absolute;left:0;top:.75em;width:6px;height:1px;background:var(--cobalt)}
@media (max-width:480px){.vs{grid-template-columns:1fr}.vs>div+div{border-left:0;border-top:1px solid var(--line);padding:16px 0 0}}

/* month by month */
.tl{list-style:none;margin:0;padding:0}
.tl li{display:grid;grid-template-columns:8.5em 1fr;gap:4px 18px;padding:14px 0;border-top:1px solid var(--line);align-items:baseline}
.tl li:last-child{border-bottom:1px solid var(--line)}
.tl li b{font:italic 400 1.15rem/1.2 var(--f-display);color:var(--cobalt);font-variant-numeric:tabular-nums}
html[data-lang="zh"] .tl li b{font-family:var(--f-cjk-display);font-style:normal;font-weight:600;font-size:1rem}
.tl li h3{font-size:1.15rem}
.tl li p{grid-column:2;font-size:14.5px;color:var(--ink-2)}
.tl li.key b{color:var(--warm)}

/* big quote */
.quote{background:linear-gradient(90deg,var(--cobalt-soft),rgba(220,227,245,0) 72%)}
.quote .copy{width:min(760px,60%)}
.quote h2{font-size:clamp(2.2rem,4.4vw,3.8rem);font-style:italic}
.quote h2 em{color:var(--ink);font-style:italic}

/* faq */
.faq{display:grid}
.faq details{border-top:1px solid var(--line)}
.faq details:last-child{border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;list-style:none;display:grid;grid-template-columns:1fr 14px;gap:16px;align-items:center;padding:18px 0;font:400 clamp(1.15rem,1.6vw,1.4rem)/1.3 var(--f-display)}
html[data-lang="zh"] .faq summary{font-family:var(--f-cjk-display);font-weight:600;font-size:1.1rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";width:12px;height:12px;border-right:1.5px solid var(--cobalt);border-bottom:1.5px solid var(--cobalt);transform:rotate(45deg) translate(-2px,-2px);transition:transform .4s var(--ease)}
.faq details[open] summary::after{transform:rotate(-135deg) translate(-3px,-1px)}
.faq details p{padding:0 0 12px;color:var(--ink-2);font-size:15.5px}
.faq details ul,.faq details ol{margin:0 0 14px;padding:0 0 0 20px;color:var(--ink-2);font-size:15.5px;line-height:1.6}
.faq details li{margin:0 0 7px}
.faq details li b,.faq details p b{color:var(--ink);font-weight:600}
html[data-lang="zh"] .faq details li b,html[data-lang="zh"] .faq details p b{font-weight:700}
.faq .ans-in{padding-bottom:10px}
.faq-h{margin:36px 0 2px;font:600 11.5px/1 var(--f-body);letter-spacing:.18em;text-transform:uppercase;color:var(--cobalt)}
html[data-lang="zh"] .faq-h{font-family:var(--f-cjk);font-size:12.5px;letter-spacing:.32em}
.ch+.faq-h{margin-top:4px}
.faq .ans{display:grid;grid-template-rows:0fr;transition:grid-template-rows .55s var(--ease)}
.faq .ans-in{overflow:hidden;min-height:0;opacity:0;transform:translateY(-6px);transition:opacity .45s var(--ease),transform .45s var(--ease)}
.faq details.is-open .ans{grid-template-rows:1fr}
.faq details.is-open .ans-in{opacity:1;transform:none;transition-delay:.12s}
.faq details.is-open summary::after{transform:rotate(-135deg) translate(-3px,-1px)}
.faq details[open]:not(.is-open) summary::after{transform:rotate(45deg) translate(-2px,-2px)}

/* contact band */
.band{background:#15171B;color:#fff;min-height:0;padding-block:clamp(72px,12vh,140px)}
.band h2 em{color:#8FA6E8}
.band .wrap{display:grid;grid-template-columns:minmax(0,7fr) minmax(0,5fr);gap:clamp(28px,6vw,96px);align-items:center}
.band h2,.band p{color:#fff}
.band .lede{color:rgba(255,255,255,.9)}
.band .small{color:rgba(255,255,255,.82)}
.band ::selection{background:#fff;color:var(--cobalt)}
.band :focus-visible{outline-color:#fff}
.band .ways{display:grid;gap:14px;justify-items:start}
.band .ig{display:flex;align-items:center;gap:10px;font-size:14px;color:rgba(255,255,255,.9)}
.band .ig code{font-family:inherit;background:rgba(255,255,255,.14);padding:4px 10px;border-radius:3px}
.band .note{color:rgba(255,255,255,.72);font-size:12.5px;line-height:1.6}
@media (max-width:860px){.band .wrap{grid-template-columns:1fr}}

footer{position:relative;z-index:var(--z-content);background:var(--paper-2);border-top:1px solid var(--line);padding:36px var(--pad-r) calc(28px + env(safe-area-inset-bottom,0px)) var(--pad-l)}
footer .in{max-width:1280px;margin-inline:auto;display:grid;grid-template-columns:auto 1fr;gap:16px 40px;align-items:baseline}
footer .word{font:italic 400 24px/1 var(--f-display)}
footer ul{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 22px;font-size:13px;font-weight:600;letter-spacing:.06em}
footer ul a{text-decoration:none;color:var(--ink-2)}
footer ul a:hover{color:var(--cobalt)}
footer .fine{grid-column:1/-1;display:grid;gap:8px;font-size:13px;color:var(--ink-2);line-height:1.6}
footer .fine p{max-width:84ch}
footer .fine a{color:var(--cobalt)}
@media (max-width:760px){footer .in{grid-template-columns:1fr}}

/* ---------- phones: a small head pinned near the top; each section's paper panel slides over it edge to edge ---------- */
@media (max-width:860px){
  .big{display:none}
  .spread{min-height:0;padding-block:0;padding-top:30vh;align-items:start}
  .spread .wrap{background:var(--paper);border-top:1px solid var(--line);padding-top:26px;padding-bottom:44px}
  .copy,.copy.wide,.quote .copy{width:100%;background:none;padding:0;border:0;gap:18px}
  .hero{padding-top:42vh}
  .hero .wrap{border-top:0;padding-top:22px}
  .hero .copy{gap:20px}
  .hero h1{max-width:none}
  .index li a{padding:10px 0}
  .quote{background:none}
  .quote .wrap{background:linear-gradient(90deg,var(--cobalt-soft),rgba(220,227,245,0) 72%),var(--paper)}
  .band{padding-top:clamp(56px,10vh,100px);padding-bottom:clamp(56px,10vh,100px)}
  .band .wrap{background:none;border:0;padding-top:0;padding-bottom:0}
  .band .copy{padding:0}
  .tl li{grid-template-columns:1fr;gap:2px}
  .tl li p{grid-column:1}
  .rows li{gap:4px 12px}
  .vs>div{padding-right:0}
  h1{font-size:clamp(2.3rem,10vw,3rem)}
  h2{font-size:clamp(1.7rem,7.4vw,2.3rem)}
  .lede{font-size:16px}
  .ch .num small{display:none}
  .btn{padding:14px 18px}
}
@media (max-width:420px){
  .cta .btn{width:100%;justify-content:center}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .rv.pre{opacity:1;transform:none}
  .rv.in{transition:none}
  .hint::after{animation:none}
  .btn,.rows li,.nav,.nav a,.sits button,#menu,.index li a,.sw>i,.st,.big,.rows.stag>li::after,.ch .num::after,.faq .ans,.faq .ans-in{transition:none}
  .rv.pre .sw>i{transform:none}
  .rv.pre.stag>.st{opacity:1;transform:none}
  .rows.stag.pre>li::after,.ch.pre .num::after{transform:none}
  .spread.pre .big{opacity:1;transform:none}
  .rv.out,.rv.out.stag>.st{opacity:1;transform:none}
  .rv.out .sw>i{transform:none}
  .rv.slow.pre,.rv.zoom.pre,.rv.pre.stag>.st.slow{filter:none;transform:none;opacity:1}
  .hero .copy{opacity:1;transform:none}
}