:root{--ink:#172033;--muted:#677186;--bg:#f5f7fb;--surface:#fff;--soft:#edf2fb;--line:#dfe5ef;--primary:#5a4ff3;--primary-dark:#4037d0;--accent:#ff7a59;--green:#159a75;--danger:#d64d5c;--shadow:0 24px 70px rgba(23,32,51,.10);--radius:24px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'DM Sans',sans-serif}button,select{font:inherit}button{cursor:pointer}h1,h2,h3,strong,.brand{font-family:'Space Grotesk',sans-serif}main{max-width:1320px;margin:auto;padding:0 28px}.view{display:none}.view.active{display:block}.site-header{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;max-width:1320px;margin:auto;padding:18px 28px;background:rgba(245,247,251,.88);backdrop-filter:blur(18px);border-bottom:1px solid rgba(223,229,239,.8)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);text-decoration:none;font-size:1.18rem}.brand 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span{color:var(--muted);font-size:.82rem}.result-actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.answer-review-list{margin-top:26px;text-align:left}.answer-review{padding:16px 0;border-top:1px solid var(--line)}.answer-review p{color:var(--muted)}.correct{color:var(--green)}.incorrect{color:var(--danger)}.level-easy{background:#e9f8f3;color:#087a5a}.level-medium{background:#fff4dd;color:#9a5a00}.level-hard{background:#fdebed;color:#b23f4a}.hidden{display:none!important}.skeleton-grid .skeleton{min-height:200px;border-radius:20px;background:linear-gradient(90deg,#e7ebf2 25%,#f7f8fb 37%,#e7ebf2 63%);background-size:400% 100%;animation:shimmer 1.4s infinite}@keyframes shimmer{to{background-position:-100% 0}}footer{max-width:1320px;margin:auto;padding:42px 28px 55px;border-top:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted)}footer div{display:grid;gap:4px}footer strong{color:var(--ink)}footer p{margin:0}@media(max-width:980px){.hero,.quiz-shell{grid-template-columns:1fr}.hero{gap:20px}.hero-board{min-height:440px}.quiz-intro{position:static}.fact-grid,.category-grid{grid-template-columns:repeat(2,1fr)}.fact-list{grid-template-columns:1fr}}@media(max-width:720px){main{padding:0 16px}.site-header{padding:14px 16px}.menu-toggle{display:block}.site-header nav{display:none;position:absolute;top:66px;left:14px;right:14px;flex-direction:column;align-items:stretch;padding:10px;background:#fff;border:1px solid var(--line);border-radius:15px;box-shadow:var(--shadow)}.site-header nav.open{display:flex}.nav-link{text-align:left}.hero{padding-top:45px;min-height:auto}.hero h1{font-size:4rem}.hero-board{display:none}.hero-proof{gap:20px;flex-wrap:wrap}.section-heading.split,.facts-header{align-items:flex-start;flex-direction:column}.fact-grid,.category-grid{grid-template-columns:1fr}.library-controls{grid-template-columns:1fr}.detail-topbar{top:66px;align-items:stretch;flex-direction:column}.detail-actions{align-items:stretch;flex-direction:column}.inline-select{min-width:0}.quiz-shell{padding-top:48px}.builder-grid{grid-template-columns:1fr}.builder-grid label:last-child{grid-column:auto}.fact-row{grid-template-columns:1fr}.exam-toolbar{top:72px}.question-card{padding:19px}.option{grid-template-columns:20px 30px 1fr}.result-card{padding:24px}footer{flex-direction:column;gap:16px}}@media(max-width:460px){.hero h1{font-size:3.25rem}.hero-actions>*{width:100%}.hero-actions{flex-direction:column}.page-head h1,.quiz-intro h1{font-size:3.15rem}.exam-toolbar small{display:none}}