@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Noto+Sans+SC:wght@400;500;600;700;800&display=swap');
:root{--bg:#0c1220;--panel:#151f31;--line:#2a3850;--ink:#f2f5fb;--muted:#a5b1c7;--accent:#81adff;--light:#edf3fc;--dark:#0f1e35;--font:'DM Sans','Noto Sans SC',sans-serif;--mono:'Consolas','SFMono-Regular',monospace}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.7;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit}img{display:block;max-width:100%}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:6px}.wrap{width:min(1280px,calc(100% - 112px));margin-inline:auto}.site-header{display:flex;align-items:center;justify-content:space-between;min-height:108px;border-bottom:1px solid var(--line);gap:24px}.brand{display:inline-flex;align-items:center;gap:7px;flex-shrink:0}.brand>span{font-size:27px;letter-spacing:-1px;font-weight:600}.brand-cn{font-size:13px;letter-spacing:3px;color:var(--muted);margin-left:15px;font-weight:400}.site-header nav{display:flex;align-items:center;gap:34px;font-size:14px}.site-header nav>a:not(.nav-cta):hover{color:var(--accent)}.nav-cta{border:1px solid #536884;padding:9px 18px;border-radius:3px}.nav-cta span{margin-left:17px;color:var(--accent)}.nav-cta:hover{border-color:var(--accent)}.skip-link{position:absolute;left:20px;top:-100px;background:var(--accent);color:var(--dark);padding:12px;z-index:100}.skip-link:focus{top:10px}.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:55px;align-items:center;padding-top:78px;padding-bottom:78px;min-height:680px}.eyebrow{font:12px/1.6 var(--mono);letter-spacing:1.8px;color:var(--muted);margin:0 0 26px}.hero .eyebrow{display:flex;align-items:center;gap:12px}.small-line{width:26px;height:2px;background:var(--accent);display:inline-block}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(54px,5.7vw,84px);font-weight:600;line-height:1.2;letter-spacing:-4px;margin-bottom:28px}.accent{color:var(--accent)}.hero-description{font-size:17px;color:#b8c5db;line-height:1.95;margin-bottom:32px}.hero-actions{display:flex;align-items:center;gap:30px}.button{min-height:51px;padding:13px 23px;border:1px solid transparent;border-radius:3px;display:inline-flex;align-items:center;justify-content:space-between;gap:36px;font-size:15px;font-weight:600;cursor:pointer;transition:background .18s,transform .18s}.primary{color:var(--dark);background:var(--accent)}.primary:hover{background:#99bdff;transform:translateY(-2px)}.secondary{border-color:var(--line);background:transparent;color:var(--ink)}.secondary:hover{background:var(--panel)}.text-link{font-size:14px;border-bottom:1px solid #506882;padding-bottom:5px;display:inline-flex;gap:24px;align-items:center}.text-link:hover{color:var(--accent)}.hero-note{font-size:12px;color:#8c9cb4;margin-top:21px;margin-bottom:0}.research-art{height:510px;position:relative;border:1px solid var(--line);background:linear-gradient(90deg,transparent 49.5%,#1d2b42 50%,transparent 50.5%),linear-gradient(0deg,transparent 49.5%,#1d2b42 50%,transparent 50.5%);background-size:70px 70px;overflow:hidden}.art-heading{position:absolute;top:19px;left:23px;right:23px;display:flex;justify-content:space-between;font:11px var(--mono);letter-spacing:1px;color:#8d9db7}.archive{position:absolute;width:76%;height:274px;border:1px solid #486491;left:12%;padding:22px 24px;background:#18253b;transform-origin:center center}.archive>span,.archive-top>span{font:10px var(--mono);letter-spacing:1px}.archive>strong{display:block;margin-top:20px;font-size:23px}.archive-back{top:77px;transform:rotate(10deg);background:#243c60;color:#96acd0}.archive-mid{top:96px;transform:rotate(4deg);background:#1c3154;color:#afc7ef}.archive-front{top:118px;transform:rotate(-4deg);border-color:#81a7e5;background:#81adff;color:#0b2554;box-shadow:0 22px 50px #0004}.archive-top{display:flex;justify-content:space-between;align-items:center}.archive-top>.archive-corner{font-size:24px}.archive h2{font-size:31px;font-weight:500;letter-spacing:-1px;line-height:1.5;margin-top:17px;margin-bottom:16px}.archive-rules{width:66%;display:grid;gap:5px}.archive-rules i{display:block;height:1px;background:#5076b7}.archive-rules i:last-child{width:65%}.archive-bottom{display:flex;align-items:center;justify-content:space-between;margin-top:8px}.archive-bottom>span{font-size:10px}.archive-bottom img{filter:brightness(.2)}.art-caption{position:absolute;bottom:22px;left:23px;right:23px;display:flex;align-items:center;gap:12px;color:#91a4bf;font:10px/1.6 var(--mono);letter-spacing:.5px}.art-caption b{color:#c5d5ef;font-weight:400}.cross{font-size:32px;color:var(--accent)}.art-coordinate{margin-left:auto;text-align:right}.compatibility{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding-block:25px;display:flex;justify-content:space-between;align-items:center;gap:25px}.compatibility p{margin:0;color:var(--muted);font-size:14px}.compatibility>div{display:flex;gap:40px;font-size:20px;font-weight:500;letter-spacing:-.5px}.library-section{padding-block:100px 105px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:36px;margin-bottom:52px}.section-heading h2,.approach-layout h2{font-size:39px;font-weight:500;line-height:1.5;letter-spacing:-1.5px;margin-bottom:0}.section-heading>p{color:var(--muted);font-size:16px;margin:0 0 6px}.section-heading .eyebrow{margin-bottom:15px}.source-grid{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line)}.source{position:relative;padding:32px 26px 0 0;margin-top:0}.source+.source{border-left:1px solid var(--line);padding-left:26px}.source-number{font:12px var(--mono);color:#8c9bb2}.source h3{font-size:23px;font-weight:500;margin:23px 0 2px}.source-en{font:10px var(--mono);letter-spacing:.8px;color:#8b9cb6}.source p{font-size:14px;line-height:1.9;color:var(--muted);margin-top:18px;margin-bottom:0}.source-symbol{height:54px;width:64px;margin-top:26px;position:relative;color:var(--accent)}.symbol-report i{position:absolute;border:1px solid currentColor;width:34px;height:42px;top:0;left:0}.symbol-report i:nth-child(2){top:5px;left:6px}.symbol-report i:nth-child(3){top:10px;left:12px;background:var(--bg)}.symbol-expert{display:flex;align-items:center;gap:6px}.symbol-expert i{display:block;width:3px;height:25px;background:currentColor}.symbol-expert i:nth-child(2){height:47px}.symbol-expert i:nth-child(3){height:34px}.symbol-expert i:nth-child(4){height:53px}.symbol-expert i:nth-child(5){height:19px}.symbol-article i{position:absolute;border:1px solid currentColor;width:25px;height:40px;top:6px;transform:skewY(13deg)}.symbol-article i:nth-child(2){left:25px;transform:skewY(-13deg)}.symbol-news i{position:absolute;border:1px solid currentColor;width:48px;height:48px;border-radius:50%;left:0;top:2px}.symbol-news i:nth-child(2){width:28px;height:28px;left:10px;top:12px}.symbol-news i:nth-child(3){width:8px;height:8px;left:20px;top:22px;background:currentColor}.approach-section{border-block:1px solid var(--line);background:#111b2a;padding-block:86px}.approach-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:65px}.approach-layout h2{font-size:32px;line-height:1.6}.muted{color:#a0b1cc}.approach-intro{font-size:15px;color:var(--muted);margin-top:21px;margin-bottom:25px}.workflow{padding:0;margin:0;list-style:none}.workflow li{display:flex;gap:24px;padding:25px 0;border-top:1px solid var(--line)}.workflow li:first-child{padding-top:0;border-top:0}.workflow li:last-child{padding-bottom:0}.workflow li>span{font:12px var(--mono);color:var(--accent);padding-top:8px}.workflow h3{font-size:19px;font-weight:500;margin-bottom:8px}.workflow p{color:var(--muted);font-size:14px;margin-bottom:0;max-width:340px}.closing{padding-block:94px}.closing>div{display:flex;justify-content:space-between;align-items:center;gap:30px}.closing h2{font-size:45px;font-weight:500;line-height:1.5;letter-spacing:-2px;margin-bottom:0}.site-footer{border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:25px;padding-block:29px}.site-footer .brand>span{font-size:20px}.site-footer p{margin:0;color:#8b9db7;font-size:12px}.site-footer>div{display:flex;gap:25px;font-size:13px;color:#a5b6d0}.site-footer a:hover{color:var(--accent)}
/* Guide page */
.guide-hero{padding-top:67px;padding-bottom:44px}.guide-hero h1{font-size:55px;letter-spacing:-2px;margin-bottom:20px}.guide-hero>p:not(.eyebrow){color:var(--muted);max-width:720px}.endpoint-box{display:flex;align-items:center;gap:18px;border:1px solid var(--line);background:var(--panel);padding:16px 20px;margin-top:28px;max-width:760px}.endpoint-box span{font-size:13px;color:var(--muted);flex-shrink:0}.endpoint-box code{font:15px var(--mono);color:var(--accent);overflow-wrap:anywhere}.copy-button{margin-left:auto;flex-shrink:0;background:transparent;color:var(--ink);border:1px solid #4a6080;border-radius:3px;cursor:pointer;font-size:13px;padding:6px 12px}.copy-button:hover{border-color:var(--accent)}.guide-layout{display:grid;grid-template-columns:220px 1fr;gap:65px;padding-bottom:85px}.guide-sidebar{position:sticky;top:28px;align-self:start;display:grid;gap:9px;padding-top:12px}.guide-sidebar>p{font:11px var(--mono);color:var(--muted);letter-spacing:1px;margin-bottom:7px}.guide-sidebar a{padding:11px 15px;border-left:2px solid var(--line);color:#bfcee5;font-size:14px}.guide-sidebar a:hover{border-color:var(--accent);color:var(--accent);background:var(--panel)}.guide-sidebar .download-nav{margin-top:20px}.guide-section{border-top:1px solid var(--line);padding:35px 0 45px;scroll-margin-top:25px}.guide-section h2{font-size:29px;font-weight:500;letter-spacing:-.7px;margin-bottom:12px}.guide-section>p{color:var(--muted);font-size:15px}.guide-section .mini-label{font:11px var(--mono);letter-spacing:1px;color:var(--accent);margin-bottom:13px}.guide-note{border-left:2px solid var(--accent);background:var(--panel);padding:17px 21px;margin:24px 0;color:#bdcce3;font-size:14px}.guide-note strong{color:var(--ink)}.steps{list-style:none;padding:0;counter-reset:step;margin-top:28px}.steps li{counter-increment:step;position:relative;padding-left:43px;margin-block:22px;font-size:15px;color:#c4cfe1}.steps li::before{content:counter(step,decimal-leading-zero);position:absolute;left:0;top:3px;font:12px var(--mono);color:var(--accent)}.steps strong{color:var(--ink);font-weight:500}.steps p{margin-bottom:10px}.steps a:not(.button){color:var(--accent);text-decoration:underline;text-underline-offset:4px}.steps code,.inline-code{font:13px var(--mono);background:#1e2d47;padding:3px 6px;border-radius:2px;overflow-wrap:anywhere}.config-table{width:100%;border-collapse:collapse;font-size:14px;margin-top:13px}.config-table th,.config-table td{border:1px solid var(--line);padding:10px 15px;text-align:left}.config-table th{font-weight:400;color:var(--muted);width:40%;background:var(--panel)}.prompt-box{border:1px solid var(--line);padding:18px 21px;color:var(--ink);margin-top:16px;font-size:15px;background:#111b2c}.guide-downloads{display:grid;grid-template-columns:1fr 1fr;gap:15px}.download-card{padding:23px;border:1px solid #3d5272;display:block;background:var(--panel)}.download-card:hover{border-color:var(--accent)}.download-card span{font:11px var(--mono);color:var(--accent)}.download-card h3{font-size:17px;font-weight:500;margin:10px 0 8px}.download-card p{color:var(--muted);font-size:13px;margin:0}.guide-section details{border-bottom:1px solid var(--line);padding:17px 0}.guide-section summary{cursor:pointer;font-size:15px;color:var(--ink)}.guide-section details p{font-size:14px;color:var(--muted);padding-top:12px;margin-bottom:0}.guide-section .source-links{font-size:12px;color:var(--muted)}.source-links a{text-decoration:underline;text-underline-offset:4px}.live-region{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--accent);color:var(--dark);padding:10px 19px;border-radius:3px;box-shadow:0 8px 30px #0005;font-size:14px;z-index:90}.live-region:empty{display:none}
@media(min-width:1500px){.hero{min-height:730px}.hero h1{font-size:92px}.research-art{height:530px}.archive{height:290px}.archive h2{font-size:35px}.archive-front{top:125px}}
@media(max-width:1050px){.wrap{width:calc(100% - 64px)}.hero{gap:30px;min-height:auto;padding-block:65px}.hero h1{font-size:64px}.research-art{height:455px}.archive{padding:18px;height:250px}.archive h2{font-size:27px}.archive-front{top:108px}.archive-mid{top:90px}.archive-back{top:74px}.compatibility>div{gap:23px;font-size:18px}.source-en{font-size:9px;letter-spacing:.1px}.source p{font-size:13px}.approach-layout{gap:35px}.guide-layout{grid-template-columns:175px 1fr;gap:35px}}
@media(max-width:760px){.wrap{width:calc(100% - 40px)}.site-header{min-height:84px}.brand>span{font-size:23px}.brand img{width:41px;height:41px}.brand-cn{display:none}.site-header nav{gap:18px;font-size:13px}.site-header nav>a:first-child{display:none}.site-header .nav-cta{display:none}.hero{grid-template-columns:1fr;padding-top:45px;gap:46px;padding-bottom:38px}.hero h1{font-size:64px;letter-spacing:-3px}.hero .eyebrow{font-size:10px;letter-spacing:1px;margin-bottom:25px}.hero-description{font-size:15px;line-height:1.9}.hero-note{font-size:11px}.research-art{max-width:500px;width:100%;height:450px;justify-self:center}.archive{width:74%;left:13%;height:253px}.archive-front{top:106px}.archive h2{font-size:31px}.compatibility{align-items:flex-start;flex-direction:column;gap:14px;padding-block:23px}.compatibility>div{display:flex;width:100%;justify-content:space-between;gap:10px;font-size:17px}.compatibility p{font-size:12px}.library-section{padding-block:61px}.section-heading{display:block;margin-bottom:32px}.section-heading h2{font-size:32px}.section-heading>p{font-size:14px;margin-top:21px}.source-grid{grid-template-columns:1fr 1fr}.source{padding:25px 12px 25px 0}.source+.source{padding-left:22px}.source:nth-child(3){border-left:0;padding-left:0;border-top:1px solid var(--line)}.source:nth-child(4){border-top:1px solid var(--line)}.source h3{font-size:21px;margin-top:17px}.source-en{font-size:9px}.source p{font-size:12px}.source-symbol{margin-top:21px}.approach-section{padding-block:52px}.approach-layout{grid-template-columns:1fr;gap:40px}.approach-layout h2{font-size:28px;letter-spacing:-1px}.approach-intro{font-size:14px}.workflow p{max-width:none}.closing{padding-block:58px}.closing>div{display:block}.closing h2{font-size:34px;letter-spacing:-1px;margin-bottom:29px}.site-footer{flex-wrap:wrap;gap:15px;padding-block:22px}.site-footer .brand{width:100%}.site-footer p{font-size:11px}.site-footer>div{font-size:12px;gap:17px}.guide-hero{padding-top:43px;padding-bottom:25px}.guide-hero h1{font-size:42px}.guide-hero>p:not(.eyebrow){font-size:14px}.endpoint-box{flex-wrap:wrap;gap:9px;padding:14px}.endpoint-box span{width:100%}.endpoint-box code{font-size:12px}.copy-button{font-size:12px;padding:5px 8px}.guide-layout{display:block;padding-bottom:30px}.guide-sidebar{position:static;display:flex;flex-wrap:wrap;gap:8px;padding-bottom:25px}.guide-sidebar>p{width:100%;margin:0 0 4px}.guide-sidebar a{padding:6px 11px;border:1px solid var(--line);font-size:12px;border-radius:3px}.guide-sidebar .download-nav{margin:0}.guide-section{padding:28px 0 33px}.guide-section h2{font-size:26px}.guide-downloads{grid-template-columns:1fr}.steps li{padding-left:32px;font-size:14px}.config-table{font-size:12px}.config-table th,.config-table td{padding:9px}.guide-note{font-size:13px;padding:14px 16px}.prompt-box{font-size:14px;padding:15px}.eyebrow{font-size:10px;letter-spacing:1px}}
@media(max-width:360px){.hero h1{font-size:54px}.research-art{height:415px}.archive{padding:16px;height:232px}.archive h2{font-size:27px}.art-caption{font-size:8px}.compatibility>div{font-size:15px}.hero-actions{gap:20px}.button{gap:23px}}
/* Reading sizes: keep small metadata legible and instructions comfortable. */
.eyebrow,.hero .eyebrow,.hero-note,.source-number,.source-en,.art-heading,.art-caption,.archive>span,.archive-top>span,.archive-bottom>span,.guide-sidebar>p,.guide-section .mini-label,.download-card>span{font-size:12px}
.hero-description,.section-heading>p,.source p,.approach-intro,.workflow p,.guide-hero>p:not(.eyebrow),.guide-section>p,.steps li,.guide-note,.prompt-box,.guide-section details p{font-size:16px}
.source-en{line-height:1.7}.source p{line-height:1.85}.source-grid{row-gap:20px}.source-en{display:block;min-height:21px}.compatibility p,.site-footer p,.site-footer>div,.guide-sidebar a,.copy-button,.download-card p,.config-table,.steps code,.inline-code,.guide-section .source-links{font-size:14px}
@media(max-width:760px){.source p{font-size:14px}.source-en{font-size:12px;min-height:42px}.site-footer{justify-content:flex-start}.site-footer>div{margin-left:auto}.art-coordinate{display:none}.archive-bottom>span{font-size:12px}.archive{width:82%;left:9%}.guide-sidebar a{font-size:14px}.guide-hero h1{font-size:38px}.config-table th{width:38%}.config-table code{font-size:12px}.steps code{font-size:12px}.hero-note{font-size:12px}.site-header nav{font-size:14px}.site-footer>div,.site-footer p{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}.button:hover{transform:none}}

/* English-first identity and persistent language control. */
.brand img{transform:scale(1.35)}
.language-switch{display:inline-flex;align-items:center;justify-content:center;min-height:38px;min-width:54px;padding:6px 12px;border:1px solid #405577;border-radius:4px;color:#dce8ff;font-size:14px;white-space:nowrap}.language-switch:hover{background:#1a2d4b;border-color:var(--accent)}
.primary{background:#3975ec;color:#fff}.primary:hover{background:#4d86f8}.archive-bottom img{filter:none}html[lang=en] h1{letter-spacing:-3.5px;line-height:1.08}html[lang=en] .archive h2{font-size:26px;letter-spacing:-.8px;line-height:1.45}html[lang=en] .guide-hero h1{font-size:54px;letter-spacing:-2px}html[lang=en] .hero .eyebrow{letter-spacing:1.2px}html[lang=en] .source h3{font-size:21px;line-height:1.35;min-height:57px}html[lang=en] .source p{margin-top:16px}.brand img{width:39px;height:39px;margin-right:7px}.site-footer .brand img{width:30px;height:30px}.language-switch:focus-visible{outline:2px solid var(--accent)}
@media(max-width:1050px){html[lang=en] .hero h1{font-size:66px}html[lang=en] .archive h2{font-size:24px}.site-header nav{gap:19px}html[lang=en] .closing h2{font-size:38px}}
@media(max-width:760px){html[lang=en] .hero h1{font-size:66px;letter-spacing:-3px}html[lang=en] .guide-hero h1{font-size:39px;letter-spacing:-1.5px}html[lang=en] .archive h2{font-size:26px}html[lang=en] .source h3{font-size:20px;min-height:54px}html[lang=en] .closing h2{font-size:33px}html[lang=en] .hero-description{font-size:16px}.hero-actions{flex-wrap:wrap}.site-header nav{gap:14px}.brand img{width:34px;height:34px}.archive-bottom>span{font-size:10px}.guide-hero .endpoint-box{max-width:100%}}
@media(max-width:520px){.site-header nav>a:not(.language-switch){display:none}.site-header{gap:14px}.language-switch{min-width:54px}.brand>span{font-size:23px}html[lang=en] .archive h2{font-size:24px}html[lang=en] .hero .eyebrow{font-size:11px}}