:root{--navy-dark:#0a1628;--navy-medium:#111d32;--navy-light:#1a2942;--blue-accent:#6b8bb8;--blue-light:#8ba5c9;--white:#fff;--gray-light:#e5e7eb;--gray-medium:#9ca3af;--pink-accent:#f9a8d4;--purple-light:#c4b5e0;--purple-medium:#9b8ac4;--purple-dark:#7c6aaf}*{box-sizing:border-box;margin:0;padding:0}html,body{max-width:100vw;font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;overflow-x:hidden}body{background:linear-gradient(180deg,var(--navy-dark)0%,var(--navy-medium)100%);color:var(--white);min-height:100vh}a{color:var(--blue-accent);text-decoration:none;transition:color .2s}a:hover{color:var(--blue-light);text-decoration:underline}.navbar{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);z-index:100;background:#0a1628d9;border-bottom:1px solid #6b8bb833;justify-content:space-between;align-items:center;padding:1rem 2rem;display:flex;position:sticky;top:0}.navbar:after{content:"";opacity:.35;z-index:-1;pointer-events:none;background:radial-gradient(80px 60px at 15% 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auto;padding:0 2rem;display:flex}.module-nav-link{color:var(--blue-accent);border:1px solid #6888b84d;border-radius:8px;padding:.75rem 1.5rem;font-weight:600;text-decoration:none;transition:all .3s}.module-nav-link:hover{border-color:var(--blue-accent);background:#6888b81a}.module-nav-next{margin-left:auto}.aps-references{max-width:900px;margin:0 auto;padding:2rem}.references-card{background:var(--navy-medium);border-radius:12px;padding:2rem}.references-list{padding:0;list-style:none}.references-list li{color:var(--gray-medium);border-bottom:1px solid #6888b81a;padding:.75rem 0;font-size:.9rem;line-height:1.6}.references-list li:last-child{border-bottom:none}.references-list em{color:var(--blue-light)}@media (max-width:768px){.topic-card,.module-overview-card{flex-direction:column;gap:1rem}.topic-card-icon,.module-overview-number{width:48px;height:48px;font-size:1.5rem}.learning-hero{padding:2rem 1rem 1rem}.module-nav{flex-direction:column}}