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/* Target decorative effects only. Scientific diagrams and teaching animations retain their semantics. */
html[data-quality="lite"] #starfield,
html[data-quality="lite"] .hero .orb,
html[data-quality="lite"] .hero .glow{display:none!important}
html[data-quality="lite"] .card,
html[data-quality="lite"] .catnav,
html[data-quality="lite"] .site-splash__language,
html[data-quality="lite"] .site-splash__quality{backdrop-filter:none!important;-webkit-backdrop-filter:none!important}
.site-splash__quality{position:absolute;z-index:3;top:max(18px,env(safe-area-inset-top));left:clamp(16px,4vw,48px);display:flex;align-items:center;gap:2px;padding:3px;border:1px solid rgba(180,234,255,.32);border-radius:999px;background:rgba(2,13,27,.62);color:#a9bdca;font:inherit;font-size:13px;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.site-splash__quality button{min-width:38px;min-height:38px;border:0;border-radius:999px;padding:6px 10px;background:transparent;color:#a9bdca;font:inherit;cursor:pointer;transition:background .16s ease,color .16s ease}
.site-splash__quality button[aria-pressed="true"]{background:rgba(197,235,251,.17);color:#f0f7fb;font-weight:700}
.site-splash__quality button:focus-visible{outline:2px solid #b4eaff;outline-offset:1px}
.site-splash__quality button:hover{color:#fff}
.site-splash__quality button:active{background:rgba(197,235,251,.3)}
.site-splash__quality-note{position:absolute;z-index:3;top:max(69px,calc(env(safe-area-inset-top) + 51px));left:clamp(16px,4vw,48px);color:#9eb6c6;font:11px/1.5 "Microsoft YaHei",sans-serif;pointer-events:none;max-width:140px}
#site-splash .site-splash__language button{min-height:38px}
html[data-quality="lite"] #site-splash .site-splash__line.is-active::after{animation:none}