:root{--accent:#5148E8;--accent-d:#3A33B8;--bg:#FAFAFF;--ink:#14132B}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg);line-height:1.55}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.topbar{display:flex;justify-content:space-between;align-items:center;padding:14px 20px;border-bottom:1px solid #eee;position:sticky;top:0;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);z-index:10}
.brand{font-weight:800;font-size:1.15rem;color:var(--ink)}
.cta-sm{background:var(--accent);color:#fff;padding:8px 14px;border-radius:10px;font-weight:700}
.cta-sm:hover{background:var(--accent-d);text-decoration:none}
.wrap{max-width:820px;margin:0 auto;padding:24px 20px 60px}
.crumbs{font-size:.85rem;color:#666;margin:4px 0 18px}
.hero h1{font-size:1.9rem;font-weight:900;letter-spacing:-.02em;margin:.2em 0}
.sub{font-size:1.1rem;color:#444;margin:.2em 0 1.2em}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:24px 0}
.course-card{display:block;border:1px solid #eee;border-radius:14px;padding:16px;background:#fff;color:var(--ink)}
.course-card:hover{border-color:var(--accent);text-decoration:none;transform:translateY(-1px)}
.course-card h3{margin:.1em 0 .3em;font-size:1.1rem}
.course-card p{font-size:.9rem;color:#555;margin:.3em 0}
.meta{font-size:.8rem;color:#888}
.block{margin:28px 0}
.unitlist,.qalist{list-style:none;padding:0}
.unitlist li{padding:10px 0;border-bottom:1px solid #f0f0f0}
.qa{border:1px solid #eee;border-radius:12px;padding:14px 16px;margin:12px 0;background:#fff}
.qa .q{font-weight:700;margin:0 0 .4em}
.qa .a{margin:0;color:#333}
.qa .why{margin:.5em 0 0;font-size:.9rem;color:#666}
.more{color:#888;font-style:italic;margin-top:14px}
.textlink{font-weight:700}
.weighting{margin:.6em 0 0;font-size:.95rem;color:#555}
.topiclist{margin:.4em 0 0;padding-left:1.2em}
.topiclist li{padding:3px 0;color:#333}
.termlist{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.termlist li{margin:0}
.termlist a{display:inline-block;border:1px solid #e4e4f2;border-radius:999px;padding:5px 12px;font-size:.9rem;background:#fff}
.unitnav{display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;margin:28px 0 0;padding-top:16px;border-top:1px solid #eee;font-size:.92rem;font-weight:600}
.alphaindex{display:flex;flex-wrap:wrap;gap:6px;margin:8px 0 4px;position:sticky;top:56px;background:var(--bg);padding:8px 0;z-index:5}
.alphaindex a{border:1px solid #e4e4f2;border-radius:8px;padding:3px 9px;font-size:.85rem;background:#fff}
.glossary dt.letter{font-size:1.3rem;color:var(--accent);margin-top:26px;border-bottom:1px solid #eee}
.siblings{display:flex;flex-wrap:wrap;gap:8px}
.siblings a{border:1px solid #e4e4f2;border-radius:999px;padding:6px 13px;font-size:.9rem;background:#fff}
.how-item{margin:16px 0}
.how-item h3{margin:0 0 .2em;font-size:1rem}
.how-item p{margin:0;color:#444}
.faq{margin:16px 0;padding-bottom:14px;border-bottom:1px solid #f0f0f0}
.faq h3{margin:0 0 .3em;font-size:1rem}
.faq p{margin:0;color:#444}
.notfound-links{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0}
.notfound-links a{border:1px solid #ddd;border-radius:999px;padding:6px 12px;font-size:.9rem;background:#fff}
.glossary dt{font-weight:800;margin-top:14px}
.glossary dd{margin:.2em 0 0;color:#333}
.getapp{margin:36px 0 0;padding:24px;border-radius:16px;background:linear-gradient(135deg,var(--accent),var(--accent-d));color:#fff}
.getapp h2{margin:.1em 0 .3em;font-size:1.3rem}
.getapp p{margin:.2em 0 1em;opacity:.95}
.badges{display:flex;gap:10px;flex-wrap:wrap}
.badge{background:#fff;color:var(--ink);padding:10px 16px;border-radius:10px;font-weight:700}
.badge:hover{text-decoration:none;opacity:.92}
.foot{max-width:820px;margin:0 auto;padding:24px 20px;font-size:.8rem;color:#999;border-top:1px solid #eee}
.foot a{color:#999}