/* U 用得上 — system fonts, no render-blocking third-party dependencies. */
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p{font-size:14px;margin-top:8px}.toast{bottom:18px;font-size:13px;white-space:normal;text-align:center;min-width:220px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}@media print{.site-header,.site-footer,.breadcrumb,.page-intro,.planner-form,.tool-explainer,.print-plan,.plan-result>.action-row,.toast,.article-toc,.article-actions{display:none!important}.container{width:100%!important}.plan-result{border:0;margin:0;padding:0}.plan-columns{display:block}.plan-summary{background:none;border:1px solid #ddd}.article-header{margin:0}.article-layout{display:block}.article-body{max-width:none}.plan-reading{break-before:avoid}.checklist input{appearance:auto}body{background:#fff;color:#000;font-size:12pt}a{color:#000}h2,h3{break-after:avoid}p,li{orphans:3;widows:3}.source-section{break-before:auto}.article-section{break-inside:auto}}

.exchange-entry{border-top:1px solid var(--line);padding:28px 0;margin-top:35px}.exchange-entry h2{font-size:25px}.exchange-entry>p{font-size:15px}.exchange-options{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:22px 0}.exchange-link{display:flex;justify-content:space-between;align-items:center;border:1px solid #c8d1bb;border-radius:7px;padding:20px;background:var(--soft)}.exchange-link:hover{border-color:#768f4d}.exchange-link strong{font-size:18px}.exchange-link small{display:block;font-size:12px;color:var(--muted);margin-top:5px}.exchange-entry>.text-link{font-size:13px}@media(max-width:700px){.exchange-options{grid-template-columns:1fr;gap:12px}.exchange-link{padding:17px}.exchange-entry h2{font-size:22px}}

.trade-tabs{display:flex;gap:8px;border-bottom:1px solid var(--line);margin-bottom:32px;padding-bottom:15px}.trade-tabs a{padding:10px 22px;border-radius:7px;font-weight:650}.trade-tabs a[aria-current=page]{background:var(--lime)}.trade-layout{align-items:start}.trade-result{position:sticky;top:24px}.trade-context{border-top:1px solid var(--line);padding:20px 0;margin-bottom:20px}.trade-context summary{font-weight:650;cursor:pointer;margin-bottom:20px}.trade-next{margin-top:40px;padding:30px;background:var(--soft);border-radius:10px}.trade-next h2{margin-bottom:18px}.trade-formula{margin:20px 0;padding:20px;border-left:3px solid #9ab244;background:var(--soft)}.trade-shell .page-intro{max-width:1050px}.trade-shell .three-columns{grid-template-columns:repeat(2,minmax(0,1fr))}.trade-shell .three-columns p{margin:0}.trade-result .cost-breakdown>div{gap:18px}.trade-result dd{overflow-wrap:anywhere}.trade-form .field small{line-height:1.6}@media(max-width:700px){.trade-result{position:static}.trade-next{padding:22px}.trade-tabs a{padding:9px 14px;font-size:14px}.trade-shell .three-columns{grid-template-columns:1fr}.trade-formula{font-size:14px}.trade-shell .page-intro h1{font-size:30px}}
.trade-demo{display:flex;align-items:center;flex-wrap:wrap;gap:12px 24px;margin:-8px 0 30px;font-size:14px}.trade-demo p{flex:1;min-width:220px}.trade-demo a{font-size:14px}

/* Localized navigation keeps language separate from region. */
.language-switch{font-size:14px;font-weight:600;white-space:nowrap;padding:8px 0;text-decoration:underline;text-underline-offset:4px}.language-switch:hover{color:#466338}html[lang=en] .main-nav{gap:30px;margin-left:0}html[lang=en] .main-nav>a{white-space:nowrap}html[lang=en] .hero h1{font-size:clamp(42px,4.5vw,65px);white-space:normal;max-width:1000px;margin-inline:auto}html[lang=en] .hero-search input{font-size:18px}html[lang=en] .hero .eyebrow{font-size:18px}html[lang=en] .task-option{white-space:normal}html[lang=en] .hero-search .button{font-size:17px;min-width:156px}
@media(min-width:701px) and (max-width:1050px){.region-control span{display:none}.header-inner{gap:16px}.header-actions{gap:14px}html[lang=en] .main-nav{gap:22px}html[lang=en] .brand{font-size:21px;gap:8px}}
@media(max-width:700px){.region-control span{display:none}.header-inner{gap:8px}.header-actions{gap:5px}.language-switch{font-size:12px;padding:10px 0}.brand{font-size:19px;gap:7px}.brand img{width:29px;height:29px}.icon-button{padding:7px}.region-control .icon{width:18px;height:18px}html[lang=en] .brand{font-size:18px;letter-spacing:0}html[lang=en] .hero h1{font-size:37px;max-width:470px}html[lang=en] .hero-search input{font-size:14px}html[lang=en] .hero-search .button{font-size:13px;min-width:82px}html[lang=en] .hero .eyebrow{font-size:14px}html[lang=en] .main-nav{gap:5px}html[lang=en] .main-nav>a{font-size:14px;padding-inline:5px}html[lang=en] .knowledge-section .section-heading{flex-wrap:wrap}html[lang=en] .knowledge-section .section-heading>a{margin-top:0}}

/* Native disclosure keeps language navigation usable without JavaScript. */
.language-picker{position:relative;z-index:30}.language-picker summary{display:flex;align-items:center;gap:8px;min-height:44px;padding:8px 10px;border:1px solid var(--line);border-radius:8px;font-size:14px;font-weight:600;white-space:nowrap;cursor:pointer;list-style:none}.language-picker summary::-webkit-details-marker{display:none}.language-picker summary:hover,.language-picker[open] summary{background:var(--soft)}.language-picker[open] .language-chevron{transform:rotate(180deg)}.language-options{position:absolute;top:calc(100% + 8px);right:0;min-width:166px;padding:6px;background:var(--paper);border:1px solid var(--line);border-radius:10px;box-shadow:0 8px 24px #1720191a}.language-option{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:10px 12px;border-radius:6px;font-size:14px;white-space:nowrap}.language-option[aria-current]{background:var(--soft);font-weight:600}.language-option[href]:hover{background:var(--lime)}@media(max-width:700px){.language-picker summary{gap:5px;padding:7px;font-size:12px}.language-picker summary>.icon:first-child{width:18px;height:18px}.language-options{min-width:150px}}

/* SVG disclosure indicators replace browser-generated triangles everywhere. */
summary:has(>.disclosure-arrow){list-style:none;position:relative;padding-left:26px;cursor:pointer}summary:has(>.disclosure-arrow)::-webkit-details-marker{display:none}summary:has(>.disclosure-arrow)::marker{content:""}.ui-arrow{display:inline-block;vertical-align:middle;flex-shrink:0}.disclosure-arrow{position:absolute;left:0;top:.25em;transform:rotate(-90deg);transition:transform .16s}details[open]>summary>.disclosure-arrow{transform:rotate(0)}.button-dark>.ui-arrow{filter:invert(1)}@media(prefers-reduced-motion:reduce){.disclosure-arrow{transition:none}}

.brand{gap:10px}.brand img{width:43px;height:43px}.footer-brand{display:inline-flex;align-items:center;gap:9px}.footer-brand img{width:32px;height:32px;object-fit:contain}@media(max-width:700px){.brand{gap:7px}.brand img{width:32px;height:32px}}
/* Compact, borderless language control; retain a comfortable click target. */
.language-picker summary{border:0;border-radius:0;padding:6px 2px;gap:6px;font-size:13px;min-height:40px;background:transparent}.language-picker summary>.icon:first-child{width:18px;height:18px}.language-picker summary>.language-chevron{width:13px;height:13px}.language-picker summary:hover,.language-picker[open] summary{background:transparent;color:#466338}@media(max-width:700px){.language-picker summary{font-size:12px;gap:4px;padding:5px 2px}.language-picker summary>.icon:first-child{width:16px;height:16px}.language-picker summary>.language-chevron{width:12px;height:12px}}

.phone-overview{padding:28px 0 30px}.phone-intro{max-width:850px}.phone-intro h1{font-size:clamp(28px,3.1vw,40px);line-height:1.4;letter-spacing:-.025em;text-wrap:balance}.phone-intro>p{font-size:17px;line-height:1.75;margin-top:14px}.phone-checks{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:26px}.phone-check{display:flex;align-items:flex-start;gap:14px;background:#f0edf6;border-radius:12px;padding:22px 20px}.phone-check-icon{display:grid;place-items:center;flex-shrink:0;width:40px;height:40px;border-radius:10px;background:#e4ddef}.phone-check h2{font-size:18px;line-height:1.5;letter-spacing:0}.phone-check p{font-size:14px;line-height:1.7;margin-top:6px}.phone-tip{display:flex;align-items:flex-start;gap:9px;font-size:13px;line-height:1.7;margin-top:17px}.phone-tip>.icon{margin-top:2px;flex-shrink:0}@media(max-width:700px){.phone-overview{padding:22px 0 26px}.phone-intro{max-width:100%}.phone-intro h1{font-size:28px;line-height:1.45}.phone-intro>p{font-size:15px;margin-top:12px}.phone-checks{grid-template-columns:1fr;gap:10px;margin-top:20px}.phone-check{padding:15px 16px;gap:12px;align-items:center}.phone-check h2{font-size:16px}.phone-check p{font-size:13px;margin-top:3px}.phone-tip{font-size:12px;margin-top:14px}}
.library-search .button{flex-shrink:0;white-space:nowrap}

.guide-intro{padding:28px 0 26px;max-width:850px}.guide-intro h1{font-size:clamp(28px,3vw,40px);margin:0 0 12px;line-height:1.4}.guide-intro>p:last-child{font-size:17px;line-height:1.75}@media(max-width:700px){.guide-intro{padding:22px 0}.guide-intro h1{font-size:28px}.guide-intro>p:last-child{font-size:15px}}