/* ToucHigh blog — Inter, orange #FF642D accent, ink #191B23, cool blue-grey neutrals, softly rounded geometry */
:root{--o:#FF642D;--o-l:#FF8C43;--o-d:#C33909;--ow:#FFF3D9;--ink:#191B23;--ink2:#2B2E38;--ink-l:#484A54;--g50:#F4F5F9;--g100:#E0E1E9;--g200:#C4C7CF;--g300:#A9ABB6;--g500:#6C6E79;--g600:#484A54;--vi:#8649E1;--bl:#006DCA;--gr:#009F81;--maxw:1200px;--sh:0 4px 16px rgba(25,27,35,.08);--sh-lg:0 24px 60px rgba(25,27,35,.16)}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:'Inter','Noto Sans SC','Noto Sans TC',system-ui,-apple-system,sans-serif;color:var(--ink);background:#fff;line-height:1.6;font-size:17px;-webkit-font-smoothing:antialiased}
html[lang^="zh"] body{line-height:1.8}
a{color:var(--bl);text-decoration:none}
img{max-width:100%;height:auto;display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.skip{position:absolute;left:-999px;top:0;background:var(--o);color:#fff;padding:10px 16px;border-radius:0 0 10px 0;z-index:200}.skip:focus{left:0}
.eyebrow{font-weight:600;text-transform:uppercase;font-size:12.5px;letter-spacing:.12em;color:var(--o)}
html[lang^="zh"] .eyebrow{letter-spacing:.06em}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-weight:600;font-size:15px;border-radius:999px;padding:12px 22px;transition:.15s;cursor:pointer;border:1.6px solid transparent;white-space:nowrap;font-family:inherit}
.btn-primary{background:var(--o);color:#fff;box-shadow:0 8px 22px rgba(255,100,45,.28)}.btn-primary:hover{background:var(--o-l);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--g200)}.btn-ghost:hover{border-color:var(--ink)}
.btn-ghost.on-dark{color:#fff;border-color:rgba(255,255,255,.3)}.btn-ghost.on-dark:hover{border-color:#fff}
/* nav */
header.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.86);backdrop-filter:blur(14px);border-bottom:1px solid var(--g100)}
.nav-in{display:flex;align-items:center;gap:20px;height:66px}
.brand{display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:22px;color:var(--ink);letter-spacing:-.03em}
.brand img{width:25px;height:25px}
.nav-links{display:flex;gap:26px;margin-left:24px}
.nav-links a{color:var(--g600);font-weight:500;font-size:15px}
.nav-links a:hover,.nav-links a.on{color:var(--ink)}
.nav-links a.on{box-shadow:inset 0 -2px 0 var(--o)}
.nav-right{margin-left:auto;display:flex;align-items:center;gap:12px}
.nav-right .btn{padding:9px 16px;font-size:14px}
.lang{display:inline-flex;border:1px solid var(--g200);border-radius:999px;overflow:hidden;font-size:13px;font-weight:600}
.lang button{padding:6px 12px;background:#fff;color:var(--g500);border:none;cursor:pointer;font-family:inherit;font-weight:600}
.lang button.active{background:var(--ink);color:#fff}
.lang-badge{font-size:13px;font-weight:600;color:var(--g500);border:1px solid var(--g200);border-radius:999px;padding:6px 12px}
.menu-btn{display:none;background:none;border:none;cursor:pointer;font-size:24px;color:var(--ink)}
/* hub */
.hub-hero{padding:56px 0 28px;background:linear-gradient(180deg,#fff,var(--g50));border-bottom:1px solid var(--g100)}
.hub-hero h1{font-size:clamp(32px,4.6vw,54px);font-weight:800;letter-spacing:-.03em;line-height:1.06;margin:14px 0 14px;max-width:20ch}
html[lang^="zh"] .hub-hero h1{letter-spacing:0;line-height:1.25}
.hub-hero p{color:var(--g500);font-size:clamp(17px,1.4vw,19px);max-width:62ch}
.filters{display:flex;flex-direction:column;gap:12px;margin-top:26px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--g200);background:#fff;padding:7px 14px;border-radius:999px;font-size:13.5px;font-weight:600;cursor:pointer;font-family:inherit;color:var(--g600)}
.chip:hover{border-color:var(--ink);color:var(--ink)}
.chip.on{background:var(--ink);border-color:var(--ink);color:#fff}
.chip .n{opacity:.6;font-weight:500;margin-left:4px}
.series{margin:40px 0 0;background:var(--ink);border-radius:24px;color:#fff;display:grid;grid-template-columns:1fr 1.25fr;overflow:hidden}
.series .s-l{padding:34px 34px}
.series .eyebrow{color:var(--o-l)}
.series h2{font-size:28px;font-weight:800;line-height:1.2;margin:12px 0}
.series p{color:var(--g200);font-size:15px}
.series ol{list-style:none;padding:24px 30px;background:var(--ink2);counter-reset:s}
.series li{counter-increment:s;display:flex;gap:12px;padding:9px 0;border-bottom:1px solid var(--ink-l);font-size:15px}
.series li:last-child{border:none}
.series li::before{content:counter(s,decimal-leading-zero);color:var(--o-l);font-weight:800;font-size:13px;padding-top:2px}
.series li a{color:#fff;font-weight:500}.series li a:hover{color:var(--o-l)}
.feat{display:grid;grid-template-columns:1.2fr 1fr;gap:0;margin:40px 0 0;background:var(--g50);border:1px solid var(--g100);border-radius:24px;overflow:hidden;color:var(--ink)}
.feat .im{aspect-ratio:3/2;overflow:hidden;background:var(--g100)}
.feat .im img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.feat:hover .im img{transform:scale(1.03)}
.feat .tx{padding:36px;display:flex;flex-direction:column}
.feat h2{font-size:clamp(24px,2.6vw,34px);font-weight:800;line-height:1.15;letter-spacing:-.02em;margin:12px 0}
html[lang^="zh"] .feat h2{letter-spacing:0;line-height:1.35}
.feat p{color:var(--g500);font-size:16px}
.meta{margin-top:auto;padding-top:16px;font-size:13px;color:var(--g500);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.meta .lg{background:#fff;border:1px solid var(--g100);border-radius:999px;padding:2px 9px;font-weight:600;font-size:12px;color:var(--g600)}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin:30px 0 80px}
.card{background:#fff;border:1px solid var(--g100);border-radius:16px;overflow:hidden;display:flex;flex-direction:column;color:var(--ink);transition:box-shadow .2s,transform .2s,border-color .2s}
.card:hover{box-shadow:var(--sh-lg);transform:translateY(-3px);border-color:var(--g200)}
.card .im{aspect-ratio:3/2;overflow:hidden;background:var(--g50)}
.card .im img{width:100%;height:100%;object-fit:cover}
.card .tx{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1}
.card h3{font-size:19px;font-weight:800;line-height:1.3;letter-spacing:-.01em;margin:10px 0 8px}
html[lang^="zh"] .card h3{line-height:1.45;letter-spacing:0;font-size:18px}
.card p{color:var(--g500);font-size:14.5px;line-height:1.6}
/* article */
.crumbs{font-size:13px;color:var(--g500);padding:22px 0 0;display:flex;gap:8px;flex-wrap:wrap}
.crumbs a{color:var(--g500)}.crumbs a:hover{color:var(--ink)}
.a-head{padding:26px 0 30px;max-width:880px}
.a-head h1{font-size:clamp(30px,4.2vw,52px);font-weight:800;line-height:1.08;letter-spacing:-.03em;margin-top:14px}
html[lang^="zh"] .a-head h1{letter-spacing:0;line-height:1.3}
.dek{font-size:clamp(17px,1.6vw,20px);color:var(--g500);margin-top:16px;max-width:64ch}
.a-meta{display:flex;flex-wrap:wrap;gap:12px 22px;align-items:center;margin-top:22px;font-size:14px;color:var(--g500)}
.a-meta b{color:var(--ink)}
.hero-fig{margin:0 0 48px;border-radius:24px;overflow:hidden;border:1px solid var(--g100);background:var(--g50)}
.hero-fig img{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover}
.layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:60px;padding-bottom:30px}
.layout>*,.grid>*,.feat>*,.series>*,.foot-grid>*{min-width:0}
.side-in{position:sticky;top:90px;display:flex;flex-direction:column;gap:18px}
.toc{background:var(--g50);border:1px solid var(--g100);border-radius:16px;padding:18px 18px 10px}
.toc h4,.side-cta h4{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--o);margin-bottom:10px}
.toc a{display:block;color:var(--g600);font-size:13.5px;padding:7px 0;border-top:1px solid var(--g100);line-height:1.45}
.toc a:hover{color:var(--ink)}
.side-cta{background:var(--ink);color:#fff;border-radius:16px;padding:22px}
.side-cta p{font-weight:800;font-size:18px;line-height:1.3;margin-bottom:14px}
.side-cta .btn{width:100%;margin-top:8px}
.answer-lead{display:flex;gap:14px;background:#fff;border:1px solid var(--g100);border-left:4px solid var(--o);border-radius:14px;padding:22px 24px;margin-bottom:26px;box-shadow:var(--sh)}
.answer-lead .qm{flex:none;font-weight:800;color:var(--o);font-size:26px;line-height:1}
.answer-lead .q{font-weight:800;font-size:19px;line-height:1.4;margin:6px 0 10px}
.answer-lead .ans{font-size:16.5px;color:var(--ink)}
.answer-lead .ans b{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--g500);margin-bottom:4px}
.kt{background:var(--g50);border:1px solid var(--g100);border-radius:16px;padding:22px 24px;margin-bottom:40px}
.kt h2{font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--o);margin-bottom:12px;font-weight:700}
.kt ul{list-style:none}
.kt li{display:flex;gap:12px;align-items:flex-start;margin-bottom:12px;font-size:16px}
.kt li::before{content:"✓";flex:none;width:22px;height:22px;border-radius:50%;background:var(--o);color:#fff;font-size:12px;font-weight:700;display:inline-flex;align-items:center;justify-content:center;margin-top:3px}
.prose h2{font-size:clamp(23px,2.4vw,30px);font-weight:800;line-height:1.22;letter-spacing:-.02em;margin:46px 0 14px;scroll-margin-top:86px}
html[lang^="zh"] .prose h2{letter-spacing:0;line-height:1.4}
.prose h3{font-size:20px;font-weight:700;margin:26px 0 10px}
.prose p{margin:0 0 16px;font-size:17px;line-height:1.8;color:var(--ink2)}
html[lang^="zh"] .prose p{line-height:1.9}
.prose a{color:var(--bl);text-decoration:underline;text-decoration-color:rgba(0,109,202,.35);text-underline-offset:3px}
.prose ul{list-style:none;margin:0 0 20px}
.prose ul li{position:relative;padding-left:22px;margin-bottom:10px;font-size:17px;line-height:1.75}
.prose ul li::before{content:"";position:absolute;left:4px;top:11px;width:8px;height:8px;border-radius:50%;background:var(--o)}
.prose ol{list-style:none;counter-reset:o;margin:0 0 22px}
.prose ol li{counter-increment:o;position:relative;padding-left:44px;margin-bottom:14px;font-size:17px;line-height:1.75}
.prose ol li::before{content:counter(o);position:absolute;left:0;top:0;width:30px;height:30px;border-radius:50%;background:var(--ow);color:var(--o-d);font-weight:800;font-size:14px;display:flex;align-items:center;justify-content:center}
.prose strong{color:var(--ink)}
.prose blockquote{border-left:4px solid var(--o);background:var(--g50);border-radius:0 12px 12px 0;padding:14px 18px;margin:22px 0;font-weight:600}
.tw{overflow-x:auto;margin:24px 0 28px;border:1px solid var(--g100);border-radius:14px}
.prose table{width:100%;border-collapse:collapse;font-size:15px;min-width:560px}
.prose th{background:var(--g50);text-align:left;font-weight:700;padding:12px 14px;border-bottom:1px solid var(--g100);font-size:14px}
.prose td{padding:12px 14px;border-top:1px solid var(--g100);vertical-align:top;line-height:1.6}
.insight{margin:48px 0;background:var(--ink);color:#fff;border-radius:24px;padding:38px 36px}
.insight .eyebrow{color:var(--o-l)}
.insight blockquote{font-size:clamp(24px,2.8vw,32px);font-weight:800;line-height:1.25;letter-spacing:-.02em;margin:12px 0 14px}
html[lang^="zh"] .insight blockquote{letter-spacing:0;line-height:1.45}
.insight p{color:var(--g200);font-size:15.5px;max-width:62ch}
.prop{margin:48px 0;border:1px solid var(--g100);border-radius:24px;background:linear-gradient(180deg,var(--ow),#fff 60%);overflow:hidden}
.prop .ph{padding:30px 32px 4px}
.prop h2{font-size:28px;font-weight:800;margin-top:8px;letter-spacing:-.02em}
.prop .pb{padding:10px 32px 2px}
.prop .pa{display:flex;gap:12px;flex-wrap:wrap;padding:12px 32px 30px}
.faq{margin:48px 0}
.faq>h2{font-size:28px;font-weight:800;margin-bottom:8px}
.faq details{border-bottom:1px solid var(--g100);padding:18px 0}
.faq summary{font-weight:700;font-size:17px;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--o);font-weight:800;font-size:24px;flex:none;line-height:1}
.faq details[open] summary::after{content:"\2013"}
.faq details p{margin-top:10px;color:var(--g600);font-size:16px;line-height:1.7}
.srcs{margin:40px 0 18px;padding:20px 22px;border:1px solid var(--g100);border-radius:16px}
.srcs h2{font-size:12.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--o);font-weight:700;margin-bottom:10px}
.srcs ol{padding-left:20px;font-size:14.5px;color:var(--g600)}
.srcs li{margin-bottom:6px;line-height:1.6}
.note{margin:18px 0 0;padding:18px 22px;background:var(--g50);border-radius:14px;font-size:14.5px;color:var(--g600);line-height:1.7}
.note b{display:block;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--ink);margin-bottom:6px}
.related{background:var(--g50);border-top:1px solid var(--g100);padding:54px 0 10px;margin-top:40px}
.related h2{font-size:28px;font-weight:800}
.related .grid{margin-top:24px;margin-bottom:40px}
.final{text-align:center;padding:76px 24px;background:#fff}
.final h2{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-.02em}
html[lang^="zh"] .final h2{letter-spacing:0}
.final p{color:var(--g500);margin:14px auto 26px;max-width:56ch}
.final .row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
footer{background:var(--ink);color:var(--g200);padding:52px 0 28px}
footer .brand{color:#fff}
.foot-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:30px;margin-bottom:32px}
footer h4{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px;font-weight:600}
footer a{color:var(--g200);font-size:15px;display:block;margin-bottom:9px}
footer a:hover{color:#fff}
.foot-bot{border-top:1px solid var(--ink-l);padding-top:18px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--g300)}
.card.hide,.feat.hide{display:none}
@media(max-width:1000px){.layout{grid-template-columns:1fr;gap:0}.side{display:none}.grid{grid-template-columns:1fr 1fr}.feat,.series{grid-template-columns:1fr}.foot-grid{grid-template-columns:1fr 1fr}}
@media(max-width:900px){.nav-links{display:none}.nav-links.open{display:flex;flex-direction:column;position:absolute;top:66px;left:0;right:0;background:#fff;border-bottom:1px solid var(--g100);margin-left:0;padding:8px 24px 14px;gap:0;box-shadow:var(--sh-lg)}.nav-links.open a{padding:13px 2px;border-bottom:1px solid var(--g50)}.menu-btn{display:block}.nav-right .btn-ghost{display:none}}
@media(max-width:600px){.wrap{padding:0 18px}.grid{grid-template-columns:1fr}.nav-right .btn-primary{display:none}.feat .tx{padding:24px}.insight{padding:28px 22px}.prop .ph,.prop .pb,.prop .pa{padding-left:20px;padding-right:20px}.foot-grid{grid-template-columns:1fr}}
.lang a{display:inline-block;padding:6px 12px;background:#fff;color:var(--g500);font-weight:600;text-decoration:none}
.lang a+a{border-left:1px solid var(--g200)}
.lang a:hover{color:var(--ink)}
.lang a.active{background:var(--ink);color:#fff}
.a-langs{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin-top:14px;font-size:14px;color:var(--g500)}
.a-langs a{display:inline-block;border:1px solid var(--g200);border-radius:999px;padding:4px 12px;color:var(--ink);font-weight:600;text-decoration:none}
.a-langs a:hover{border-color:var(--o);color:var(--o)}
.hub-hero .hub-note{margin-top:14px;font-size:14px;color:var(--g500)}
@media(max-width:560px){.nav-right .lang a{padding:6px 9px}}