/* Yu Investudy — Premium multi-product site / v1.0.0
 * Intentionally scoped to .yi-page / .yi-* so legacy and documentation pages remain safe.
 * No third-party fonts, scripts, trackers, images or libraries.
 */
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  --yi-shadow:0 18px 50px rgba(10,35,46,.07);
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}
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.yi-concept-foot b{font-weight:700;color:#c6af85;}
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.yi-stat{padding:29px 35px;border-right:1px solid #e8eeec;}
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.yi-stat span{display:block;font-size:12px;color:#809097;margin-top:1px;}
.yi-section{padding:105px 0;}
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.yi-inline .yi-arrow{display:inline-block;}
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.yi-product-card{position:relative;display:flex;flex-direction:column;min-height:378px;padding:36px 37px 31px;border:1px solid #dce6e3;border-radius:16px;background:#fff;box-shadow:var(--yi-shadow);overflow:hidden;transition:border-color .2s,transform .2s,box-shadow .2s;}
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.yi-news a{font-weight:650;}
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.yi-page-hero .yi-shell{position:relative;z-index:1;padding-top:93px;padding-bottom:99px;}
.yi-page-hero h1{font-size:clamp(38px,4.4vw,61px);line-height:1.27;letter-spacing:-.06em;max-width:780px;margin:0 0 22px;}
.yi-page-hero p.yi-page-lead{color:#aec2c6;max-width:680px;margin:0;font-size:16px;line-height:2.05;}
.yi-page-hero .yi-overline{color:var(--yi-gold-light);}
.yi-filter-line{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-bottom:26px;padding-bottom:22px;border-bottom:1px solid #dce7e2;}
.yi-filter-line p{margin:0;color:#6d8086;font-size:13px;}
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.yi-detail-hero{padding:96px 0 103px;background:linear-gradient(120deg,#0b1b29,#18313b);color:#fff;position:relative;overflow:hidden;}
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.yi-detail-hero h1 small{display:block;color:#a7c2c5;font-size:.49em;font-weight:500;margin-top:12px;letter-spacing:-.01em;}
.yi-detail-hero p.yi-detail-lead{max-width:570px;color:#b6c5c9;line-height:2.1;font-size:15px;margin:0 0 27px;}
.yi-detail-meta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:32px;}
.yi-detail-meta .yi-tag{background:rgba(255,255,255,.07);border-color:rgba(239,245,243,.2);color:#d5e0df;}
.yi-feature-list{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.yi-feature-card{background:#fff;padding:31px 28px 32px;border:1px solid #dde7e3;border-radius:14px;box-shadow:0 8px 30px rgba(15,40,48,.035);}
.yi-feature-glyph{width:48px;height:48px;display:grid;place-items:center;border:1px solid #d5e2db;background:#f0f5f1;border-radius:12px;color:var(--yi-teal);font:24px Georgia,serif;}
.yi-feature-card h3{font-size:18px;line-height:1.5;letter-spacing:-.025em;margin:23px 0 10px;}
.yi-feature-card p{font-size:13px;color:#687b7e;line-height:2.1;margin:0;}
.yi-specs{border:1px solid #d8e4e0;border-radius:15px;background:#fff;overflow:hidden;}
.yi-spec-row{display:grid;grid-template-columns:200px 1fr;border-bottom:1px solid #e5edeb;}
.yi-spec-row:last-child{border-bottom:none;}
.yi-spec-row dt,.yi-spec-row dd{margin:0;padding:19px 25px;font-size:14px;}
.yi-spec-row dt{background:#f6f8f6;color:#61787d;font-weight:690;}
.yi-spec-row dd{color:#223941;}
.yi-callout{margin-top:22px;padding:24px 28px;background:#eef3ef;border-left:3px solid #bda375;color:#556a6e;font-size:13px;line-height:2;}
.yi-doc-links{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;}
.yi-doc-card{display:block;padding:32px;border:1px solid #d9e6e0;border-radius:14px;background:#fff;transition:transform .2s,border-color .2s;}
.yi-doc-card:hover{transform:translateY(-3px);border-color:#a8c0b6;color:var(--yi-ink)!important;}
.yi-doc-card .yi-overline{color:var(--yi-teal);}
.yi-doc-card h3{font-size:22px;margin:10px 0;}
.yi-doc-card p{color:var(--yi-muted);font-size:13px;line-height:2;margin:0 0 18px;}
.yi-doc-card .yi-inline{color:var(--yi-teal)!important;}
.yi-language-cloud{display:flex;flex-wrap:wrap;gap:9px;margin-top:25px;}
.yi-language-cloud a{display:inline-flex;padding:8px 14px;background:#fff;border:1px solid #d8e3df;border-radius:5px;font-size:12px;color:#446067;transition:background .2s;}
.yi-language-cloud a:hover{background:#eff5f1;}
.yi-support-list{display:grid;grid-template-columns:1fr 1fr;gap:25px;}
.yi-support-card{background:#fff;border:1px solid #dce6e2;border-radius:14px;padding:35px;}
.yi-support-card h3{font-size:24px;margin:0 0 12px;}
.yi-support-card p{color:var(--yi-muted);font-size:14px;line-height:2;margin:0 0 20px;}
.yi-soft-panel{padding:31px 36px;border:1px solid #dde7e4;background:#f8faf7;border-radius:12px;}
.yi-soft-panel h3{margin:0 0 12px;font-size:20px;}
.yi-soft-panel p{margin:0;color:var(--yi-muted);font-size:13px;line-height:2;}
/* Non-destructive visual cohesion on pre-existing informational pages */
body.yi-legacy {background:#f7f8f6!important;color:#253741!important;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Noto Sans JP",Meiryo,sans-serif!important;}
body.yi-legacy h1,body.yi-legacy h2 {letter-spacing:-.035em;}
body.yi-legacy header{border-bottom:1px solid #dae4df;}
body.yi-legacy .yi-legacy-product-nav{display:inline-flex;align-items:center;gap:4px;font-weight:700;font-size:13px;}
body.yi-legacy .yi-legacy-product-nav:hover{color:#286f6c!important;}
@media(max-width:1050px){
 .yi-nav{gap:19px;} .yi-hero-inner{gap:30px;} .yi-hero h1{font-size:clamp(40px,5vw,60px);} .yi-detail-overview{gap:25px;} .yi-footer-grid{gap:24px;}
}
@media(max-width:820px){
 .yi-shell{padding:0 24px;} .yi-topbar{height:74px;} .yi-nav,.yi-header-cta{display:none;} .yi-mobile-menu{display:block;margin-left:auto;position:relative;}
 .yi-mobile-menu summary{list-style:none;border:1px solid #d3dfda;padding:8px 15px;border-radius:6px;font-size:12px;font-weight:700;cursor:pointer;}
 .yi-mobile-menu summary::-webkit-details-marker{display:none;}
 .yi-mobile-dropdown{position:absolute;right:0;top:48px;width:min(290px,85vw);display:flex;flex-direction:column;gap:0;padding:10px 18px;background:#fff;border:1px solid #d7e3df;border-radius:10px;box-shadow:0 18px 40px rgba(10,35,46,.13);}
 .yi-mobile-dropdown a{padding:11px;border-bottom:1px solid #edf1ee;font-size:14px;} .yi-mobile-dropdown a:last-child{border-bottom:0;}
 .yi-hero-inner{grid-template-columns:1fr;gap:75px;padding:82px 0 85px;} .yi-hero h1{max-width:660px;} .yi-concept{max-width:570px;margin:0 auto;}
 .yi-stat-inner{grid-template-columns:repeat(3,1fr);} .yi-stat{padding:22px 19px;} .yi-stat:first-child{padding-left:0;} .yi-section{padding:76px 0;}
 .yi-section-head{align-items:start;flex-direction:column;gap:20px;} .yi-section-head p{max-width:630px;} .yi-value-grid{gap:20px;} .yi-footer-grid{grid-template-columns:1.3fr 1fr 1fr;}.yi-footer-grid > div:first-child{grid-column:1/-1;}
 .yi-detail-overview{grid-template-columns:1fr;gap:42px;} .yi-detail-hero{padding:65px 0 82px;}
}
@media(max-width:610px){
 .yi-shell{padding:0 19px;} .yi-topbar{height:70px;} .yi-brandmark{width:37px;height:37px;} .yi-brandname{font-size:13px;} .yi-brandcaption{font-size:9px;}
 .yi-hero-inner{padding-top:68px;gap:53px;} .yi-hero h1{font-size:39px;line-height:1.34;} .yi-hero-lead{font-size:14px;} .yi-hero-actions{gap:10px;} .yi-hero-actions .yi-btn{width:100%;} .yi-hero-meta{gap:14px;flex-wrap:wrap;margin-top:39px;}
 .yi-concept-tiny{right:8px;} .yi-concept-frame{transform:none;} .yi-concept-head{padding:16px;} .yi-concept-body{padding:19px;}
 .yi-stat-inner{grid-template-columns:1fr;}.yi-stat{padding:15px 0;border-right:0;border-bottom:1px solid #e8eeec;}.yi-stat:last-child{border-bottom:none;}
 .yi-section{padding:65px 0;}.yi-section-head{margin-bottom:28px;}.yi-section h2{font-size:32px;}
 .yi-product-grid,.yi-feature-list,.yi-doc-links,.yi-support-list{grid-template-columns:1fr;}.yi-product-card,.yi-empty-spot{min-height:320px;padding:29px;}.yi-product-card h3{margin-top:24px;}
 .yi-value-grid{grid-template-columns:1fr;gap:24px;}.yi-value{padding-top:20px;}
 .yi-note-banner{padding:28px;flex-direction:column;align-items:start;}.yi-news{grid-template-columns:1fr;gap:14px;}.yi-news li{gap:15px;}
 .yi-footer{padding:48px 0 22px;}.yi-footer-grid{grid-template-columns:1fr 1fr;gap:32px 17px;margin-bottom:44px;}.yi-footer-grid > div:first-child{grid-column:1/-1;}.yi-footer-bottom{align-items:start;flex-direction:column;}
 .yi-page-hero .yi-shell{padding-top:66px;padding-bottom:74px;}.yi-page-hero h1{font-size:37px;}
 .yi-detail-hero h1{font-size:37px;}.yi-spec-row{grid-template-columns:1fr;}.yi-spec-row dt{padding:11px 18px;}.yi-spec-row dd{padding:15px 18px;}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto;}.yi-page *,.yi-page *::before,.yi-page *::after{transition:none!important;animation:none!important;}}
@media(max-width:820px){.yi-mobile-menu summary{white-space:nowrap;min-width:87px;text-align:center;}}
@media(max-width:610px){.yi-mobile-menu summary{font-size:11px;padding:8px 8px;min-width:74px;}.yi-brandcaption{letter-spacing:.12em;}}