:root{--bg:#eef7ff;--card:#fff;--ink:#0b1b3a;--muted:#51607a;--navy:#0b1b3a;--blue:#2f7de1;--line:#0b1b3a1f;--shadow:0 10px 30px #0b1b3a1a;--radius:16px;--radius2:22px;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif}*{box-sizing:border-box}body{background:var(--bg);color:var(--ink);margin:0}a{color:inherit}.app{flex-direction:column;height:100vh;display:flex}.header{z-index:10;border-bottom:1px solid var(--line);background:linear-gradient(90deg,#a9d2ffa6,#eef7ff);justify-content:space-between;align-items:center;gap:14px;padding:14px 18px;display:flex;position:sticky;top:0}.brand{align-items:center;gap:12px;display:flex}.logo{background:var(--navy);color:#fff;border-radius:14px;justify-content:center;align-items:center;width:40px;height:40px;font-weight:800;display:flex}.titles .title{font-size:18px;font-weight:800;line-height:1.1}.titles 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108px);position:fixed;top:86px;right:22px}@media (width<=980px){.quizContent{width:100%}.sidePanel{width:auto;height:auto;margin-top:14px;position:static}}