@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700;800&family=Libre+Baskerville:wght@400;700&display=swap");:root{--bg:#0c1422;--panel:#111c2d;--panel2:#172439;--ink:#f8f1e5;--muted:#aab6c8;--line:#334155;--accent:#ff5964;--teal:#35b7b4;--paper:#fffaf0}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 1px 1px,#243149 1px,transparent 1px) 0 0/16px 16px,var(--bg);color:var(--ink);font-family:Inter,system-ui,sans-serif}.topbar{position:sticky;top:0;z-index:30;display:flex;justify-content:space-between;gap:20px;align-items:center;padding:14px clamp(16px,4vw,54px);border-bottom:1px solid var(--line);background:#0c1422e8;backdrop-filter:blur(16px)}a{color:inherit}.brand{font:700 1.05rem "Libre Baskerville",serif;text-decoration:none}.topbar nav{display:flex;gap:16px}.topbar nav a{font-size:.85rem;font-weight:700}.library-shell{width:min(1520px,calc(100% - 34px));margin:auto;padding:38px 0 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var(--line);border-radius:8px;background:#0d1726;color:var(--ink)}.quiz-choice.correct{border-color:#4ade80}.quiz-choice.wrong{border-color:#fb7185}.quiz-nav{display:flex;justify-content:space-between;gap:10px;margin-top:18px}.quiz-nav button{min-height:42px;border:1px solid var(--line);border-radius:8px;padding:0 16px;font-weight:800}.empty{grid-column:1/-1;border:1px dashed var(--line);padding:32px;text-align:center;color:var(--muted)}@media(max-width:1050px){.hero{grid-template-columns:1fr}.hero figure{min-height:320px}.library-grid{grid-template-columns:1fr}.filters{position:static}.cards{grid-template-columns:1fr}.source-summary{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.library-shell{width:calc(100% - 20px);padding-top:20px}.topbar{align-items:flex-start;flex-direction:column}.hero h1{font-size:2.8rem}.source-summary{grid-template-columns:1fr}.results-head{align-items:flex-start;flex-direction:column}.topbar nav{overflow:auto;width:100%}}

/* Unified premium scroll system */
:root{--scroll-track:rgba(15,23,42,.32);--scroll-thumb-1:#22d3ee;--scroll-thumb-2:#8b5cf6;--scroll-thumb-3:#34d399}
html{scrollbar-gutter:stable;scroll-behavior:smooth;overflow-x:hidden}
body,#root,main{max-width:100%;overflow-x:hidden}
*{scrollbar-width:thin!important;scrollbar-color:var(--scroll-thumb-1) var(--scroll-track)!important}
*::-webkit-scrollbar{width:12px!important;height:12px!important;display:block!important}
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*::-webkit-scrollbar-thumb:hover{background:linear-gradient(180deg,#67e8f9,#a78bfa 56%,#6ee7b7)!important;background-clip:padding-box!important}
*::-webkit-scrollbar-corner{background:transparent!important}
iframe{max-width:100%;border:0}
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