:root{color-scheme:light dark;--bg:#fff;--surface:#f6f7f9;--ink:#252a32;--muted:#646b77;--line:#e4e6ea;--accent:#ffcc45;--accent-ink:#222833;--link:#2655b6;--error:#a73024;--dialog:#fff;--radius:14px}html{-webkit-text-size-adjust:100%;text-size-adjust:100%}*{box-sizing:border-box}body{margin:0;min-height:100dvh;display:flex;flex-direction:column;background:var(--bg);color:var(--ink);font:15px/1.7 -apple-system,BlinkMacSystemFont,'PingFang SC','Microsoft YaHei',sans-serif}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default}h1,h2,h3,p{margin:0}[hidden]{display:none!important}:focus-visible{outline:3px solid var(--link);outline-offset:4px}.sr-only{position:absolute;clip:rect(0,0,0,0);clip-path:inset(50%);width:1px;height:1px;overflow:hidden;white-space:nowrap}.skip{position:fixed;left:12px;top:12px;transform:translateY(-180%);z-index:4;background:var(--bg);border:1px solid var(--line);padding:8px 15px}.skip:focus{transform:none}.topbar{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:22px 36px}.small-brand{font:750 23px/1.2 Arial,sans-serif;letter-spacing:-.6px}.small-brand>span{color:var(--ink);background:var(--accent);padding:3px 5px;border-radius:5px;margin-right:1px}.topbar nav{display:flex;align-items:center;gap:27px;font-size:13px}.topbar nav>a:hover{text-decoration:underline}.top-app{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:9px;min-height:40px;padding:7px 15px}.search-page{width:calc(100% - 40px);max-width:840px;margin:106px auto 80px;flex:1}.search-intro{text-align:center;margin-bottom:40px}.wordmark{font:750 70px/1.2 Arial,sans-serif;letter-spacing:-3px;color:var(--ink)}.wordmark>span{display:inline-block;background:var(--accent);padding:1px 10px 0;border-radius:13px;margin-right:4px;letter-spacing:-2px}.home-tagline{font-size:15px;color:var(--muted);margin-top:16px;letter-spacing:2px}.search-form{width:100%;margin:0}.input-group{display:flex;align-items:center;border:3px solid var(--accent);border-radius:var(--radius);padding:3px;background:var(--bg);min-height:66px;transition:box-shadow .16s}.input-group:focus-within{box-shadow:0 0 0 4px #ffcc4526}.input-group input{min-width:0;width:0;max-width:100%;flex:1 1 0%;-webkit-appearance:none;appearance:none;border:0;background:transparent;color:var(--ink);padding:12px 18px;font-size:17px;outline:none;min-height:52px}.input-group input::placeholder{color:var(--muted);opacity:1}.input-group input::-webkit-search-cancel-button{display:none}.clear-query{flex:0 0 39px;width:39px;min-height:44px;border:0;background:transparent;color:var(--muted);font-size:25px;padding:0}.search-submit{flex:0 0 100px;min-height:52px;border:0;border-radius:9px;background:var(--accent);color:var(--accent-ink);font-size:17px;font-weight:700;padding:12px 18px}.search-submit:disabled{opacity:.7}.search-submit:active,.top-app:active,.more-results:active{transform:translateY(1px)}.search-status{font-size:13px;line-height:1.85;min-height:24px;margin:11px 5px 0;color:var(--muted)}.search-status.is-error{color:var(--error)}.suggestions{display:flex;justify-content:center;align-items:center;gap:19px;flex-wrap:wrap;margin-top:11px;color:var(--muted);font-size:12px}.suggestions>span{font-size:12px}.suggestions button{color:var(--ink);background:none;border:0;border-bottom:1px solid var(--line);padding:5px 0;min-height:34px;font-size:13px}.suggestions button:hover{border-color:var(--muted)}.footer{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:22px 36px;border-top:1px solid var(--line);font-size:12px;color:var(--muted)}.footer nav{display:flex;gap:23px;align-items:center}.footer a:hover,.footer button:hover{color:var(--ink)}.footer .app-trigger{border:0;padding:0;background:transparent;color:inherit;font-size:12px}.has-results .search-page{max-width:920px;margin-top:21px}.has-results .search-intro{display:none}.has-results .search-form{max-width:820px}.results-section{max-width:750px;margin-top:16px}.result-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:10px 0 18px;border-bottom:1px solid var(--line)}.result-heading h2{font-size:16px;font-weight:600;line-height:1.8;overflow-wrap:anywhere}.result-heading>span{white-space:nowrap;color:var(--muted);font-size:12px}.result-list{padding-top:3px}.search-result{padding:23px 0 22px}.result-source{display:flex;align-items:center;gap:9px;font-size:12px;color:var(--muted);min-width:0;overflow-wrap:anywhere}.source-monogram{display:grid;place-items:center;flex:0 0 22px;width:22px;height:22px;border-radius:6px;background:var(--surface);border:1px solid var(--line);color:var(--ink);font-weight:750;font-size:11px}.search-result h3{font-size:21px;font-weight:500;line-height:1.5;color:var(--link);margin:8px 0 7px;overflow-wrap:anywhere}.search-result h3>a:hover{text-decoration:underline;text-underline-offset:3px}.result-snippet{font-size:14px;line-height:1.9;color:var(--ink);overflow-wrap:anywhere;max-width:710px}.more-results{width:100%;margin-top:20px;min-height:55px;border:1px solid var(--line);border-radius:11px;background:var(--surface);color:var(--ink);font-size:15px;font-weight:650}.more-results>span{margin-left:16px}.empty-results{padding:43px 0 30px}.empty-results h3{font-size:23px;font-weight:600;margin-bottom:10px}.empty-results p{font-size:14px;color:var(--muted)}.loading-results{max-width:740px;margin-top:35px}.loading-line{height:19px;max-width:650px;background:var(--surface);border-radius:6px;margin:19px 0}.loading-line.short{max-width:390px;margin-bottom:42px}.preview-note,.notice{font-size:12px;color:var(--muted);margin-top:26px;text-align:center}.app-dialog{color:var(--ink);background:var(--dialog);width:calc(100% - 40px);max-width:440px;padding:39px 34px 27px;border:1px solid var(--line);border-radius:20px;text-align:center}.app-dialog::backdrop{background:#11172270}.dialog-close{position:absolute;top:8px;right:9px;width:40px;height:40px;padding:0;border:0;background:transparent;color:var(--muted);font-size:27px}.app-monogram{display:grid;place-items:center;width:65px;height:65px;border-radius:15px;margin:0 auto 22px;background:var(--accent);color:var(--accent-ink);font:750 47px/1 Arial,sans-serif}.app-dialog h2{font-size:24px;font-weight:750;line-height:1.55;margin-bottom:13px}.app-dialog>p{font-size:14px;line-height:1.9;color:var(--muted)}.app-download{display:flex;align-items:center;justify-content:center;min-height:56px;margin-top:27px;background:var(--accent);color:var(--accent-ink);border-radius:10px;font-size:16px;font-weight:700}.app-dialog .download-unavailable{padding:14px 12px;margin-top:26px;background:var(--surface);border:1px solid var(--line);border-radius:10px;font-size:15px;color:var(--muted)}.dialog-return{border:0;background:transparent;color:var(--muted);min-height:42px;font-size:13px;margin-top:12px;padding:6px 18px}.document-page{max-width:760px;width:calc(100% - 40px);margin:55px auto 70px;flex:1}.document-page h1{font-size:35px;line-height:1.5;margin-bottom:28px}.document-page h2{font-size:20px;margin:27px 0 12px}.document-page p{font-size:15px;line-height:2;color:var(--muted);margin:12px 0}.document-page>a{display:inline-block;color:var(--link);margin-top:29px;font-size:14px}
@media(prefers-color-scheme:dark){:root{--bg:#171b21;--surface:#232a34;--ink:#eef0f4;--muted:#b2bac7;--line:#3c4553;--link:#9dbdfd;--error:#ffaea1;--dialog:#20262f}.small-brand>span,.wordmark>span{color:var(--accent-ink)}}
@media(max-width:767px){.topbar{padding:20px;gap:16px}.small-brand{font-size:21px}.topbar nav{gap:18px;font-size:12px}.top-app{font-size:12px;min-height:37px;padding:6px 12px}.search-page{margin-top:94px;margin-bottom:65px;max-width:620px}.wordmark{font-size:58px;letter-spacing:-2px}.wordmark>span{padding:1px 9px 0;border-radius:11px}.home-tagline{font-size:13px;margin-top:14px}.search-intro{margin-bottom:29px}.input-group{min-height:59px;padding:2px;border-radius:12px}.input-group input{font-size:16px;padding:10px 12px;min-height:48px}.clear-query{flex-basis:28px;width:28px;font-size:24px}.search-submit{flex-basis:72px;font-size:15px;min-height:47px;padding:10px;border-radius:8px}.search-status{font-size:12px;margin-top:10px}.suggestions{gap:12px 18px;margin-top:10px}.suggestions>span{width:100%;text-align:center}.suggestions button{font-size:12px;min-height:32px}.footer{padding:21px 20px;display:block;font-size:11px}.footer nav{flex-wrap:wrap;gap:19px;margin-top:11px;font-size:12px}.has-results .search-page{margin-top:14px}.result-heading{gap:16px;padding:8px 0 16px}.result-heading h2{font-size:15px}.result-heading>span{font-size:11px}.results-section{margin-top:12px}.search-result{padding:21px 0 19px}.result-source{font-size:11px;gap:8px}.source-monogram{width:21px;height:21px;flex-basis:21px}.search-result h3{font-size:19px;line-height:1.55;margin-top:8px}.result-snippet{font-size:13px;line-height:1.95}.more-results{min-height:54px;margin-top:20px;font-size:14px}.app-dialog{padding:38px 24px 25px}.app-dialog h2{font-size:22px}.app-dialog>p{font-size:13px}.app-monogram{width:59px;height:59px;font-size:43px}.document-page{margin-top:37px}.document-page h1{font-size:29px;margin-bottom:25px}.document-page h2{font-size:19px}.document-page p{font-size:14px}}
@media(max-width:350px){.topbar{padding:18px}.topbar nav{gap:13px}.top-app{padding:6px 9px}.search-page,.document-page{width:calc(100% - 32px)}.search-page{margin-top:75px}.wordmark{font-size:54px}.input-group input{padding-left:10px;font-size:16px}.search-submit{flex-basis:63px;font-size:14px}.clear-query{flex-basis:25px;width:25px}.suggestions{gap:10px 15px}.app-dialog h2{font-size:21px}}
@media(prefers-reduced-motion:reduce){.input-group{transition:none}.search-submit:active,.top-app:active,.more-results:active{transform:none}}

.search-guide{margin-top:145px;border-top:1px solid var(--line);padding-top:34px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:60px}.guide-summary h2{font-size:17px;line-height:1.7;margin-bottom:13px;font-weight:650}.guide-summary p{font-size:13px;line-height:2;color:var(--muted)}.guide-summary>a{display:inline-block;font-size:13px;color:var(--link);margin-top:16px}.has-results .search-guide{display:none}.guide-faq{margin:15px 0 30px}.guide-faq dt{font-size:16px;font-weight:650;margin:25px 0 8px}.guide-faq dd{margin:0;font-size:14px;line-height:2;color:var(--muted)}.document-page p a{color:var(--link)}.guide-actions{display:flex;align-items:center;gap:25px;flex-wrap:wrap;margin-top:30px;font-size:14px}.guide-download{display:inline-flex;align-items:center;justify-content:center;min-height:53px;border-radius:9px;padding:10px 23px;background:var(--accent);color:var(--accent-ink);font-weight:650}.guide-actions>a:last-child{color:var(--link)}@media(max-width:767px){.search-guide{margin-top:130px;grid-template-columns:minmax(0,1fr);gap:28px;padding-top:29px}.guide-summary h2{font-size:16px}.guide-summary p{font-size:13px}.guide-faq dt{font-size:15px}.guide-faq dd{font-size:13px}}
.loading-results{margin:22px 0 0;max-width:750px}.wait-card{padding:25px 27px 19px;background:var(--surface);border:1px solid var(--line);border-radius:15px}.wait-header{display:flex;gap:17px;align-items:center;min-width:0}.wait-header>div{min-width:0}.wait-header h2{font-size:18px;line-height:1.55;font-weight:650}.wait-header p{font-size:13px;line-height:1.7;color:var(--muted);margin-top:4px;overflow-wrap:anywhere}.wait-orbit{flex:0 0 28px;width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--ink);border-right-color:var(--accent);border-radius:50%;animation:search-orbit 1.1s linear infinite}.wait-card>p{font-size:13px;color:var(--muted);line-height:1.9;margin-top:19px}.wait-bottom{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:11px;color:var(--muted);margin-top:20px;padding-top:14px;border-top:1px solid var(--line)}.result-placeholders{padding:11px 0}.result-placeholder{padding:22px 2px}.result-placeholder>span{display:block;background:var(--surface);border-radius:5px;animation:search-pulse 1.8s ease-in-out infinite}.skeleton-domain{height:12px;width:125px;margin-bottom:13px}.skeleton-title{height:21px;width:min(70%,350px);margin-bottom:17px}.skeleton-line{height:12px;width:95%;margin-top:12px}.skeleton-line.short{width:72%}.challenge-widget{margin:15px 0;max-width:100%;display:flex;justify-content:flex-start}.is-searching .search-intro,.is-searching .suggestions,.is-searching .search-guide{display:none}.is-searching .search-page{max-width:920px;margin-top:21px}.is-searching .search-form{max-width:820px}@keyframes search-orbit{to{transform:rotate(360deg)}}@keyframes search-pulse{50%{opacity:.48}}@media(max-width:767px){.wait-card{padding:21px 20px 17px}.wait-header h2{font-size:16px}.wait-header p{font-size:12px}.wait-card>p{font-size:12px}.wait-bottom{font-size:10px;gap:12px}.wait-header{gap:13px}.wait-orbit{width:25px;height:25px;flex-basis:25px}.is-searching .search-page{margin-top:14px}}@media(prefers-reduced-motion:reduce){.wait-orbit,.result-placeholder>span{animation:none}}

.is-searching .search-status{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;margin:0}

/* Let mobile content shrink naturally instead of widening the document. */
body{min-width:0;width:100%;max-width:100%}
.topbar,.topbar nav,.search-page,.document-page,.search-form,.input-group,.results-section,.loading-results,.result-heading,.result-source,.guide-summary,.footer,.footer nav{min-width:0}
.topbar nav{flex-wrap:wrap;justify-content:flex-end}
.small-brand{flex-shrink:0}
.search-page,.document-page{overflow-wrap:anywhere}
.result-heading h2,.result-source>span:last-child{min-width:0}
.result-source>span:last-child{overflow-wrap:anywhere;word-break:break-word}
.app-dialog{max-width:min(440px,calc(100% - 32px));max-height:calc(100dvh - 32px);overflow-y:auto;overflow-wrap:anywhere}
@media(max-width:767px){.input-group input{font-size:16px}.wait-bottom{flex-wrap:wrap}.search-status{overflow-wrap:anywhere}}