:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:#18233b;background:#f3f5fa;font-synthesis:none;--ink:#18233b;--muted:#5c667d;--purple:#6144cb;--line:#dfe4ef}*{box-sizing:border-box}body{margin:0}button,a,summary,select{touch-action:manipulation}button,select{font:inherit}button{cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible{outline:3px solid #9877fb;outline-offset:4px}aside{position:fixed;width:272px;height:100vh;background:#111c35;color:#fff;padding:36px 24px;display:flex;flex-direction:column}.brand{text-decoration:none;color:white;font-weight:800;letter-spacing:.12em;font-size:16px;display:flex;align-items:center;gap:12px}.brand-icon{background:#a6eece;color:#111c35;padding:6px 11px;border-radius:9px;font-size:24px}.course{font-size:12px;letter-spacing:.11em;color:#b5bdd1;margin:47px 12px 24px}.course span{display:block;color:white;font-size:21px;letter-spacing:0;margin-top:8px}nav{display:grid;gap:8px}nav button{text-align:left;background:transparent;border:0;color:#aeb8cf;border-radius:9px;padding:16px 12px;display:flex;gap:14px;font-size:14px}nav button span{font-weight:600;color:#dce1ed}nav button.active{background:#283550;color:#a6eece}nav button.active span{color:white}.aside-note{margin:auto 12px 0;border-top:1px solid #344058;padding-top:25px}.mini-label{display:block;font-size:12px;letter-spacing:.12em;color:var(--muted);font-weight:700}.aside-note .mini-label{color:#a6eece}.aside-note strong{display:block;font-size:23px;line-height:1.35;margin-top:12px}.aside-note p{font-size:14px;color:#b5bdd1;line-height:1.6}.small{font-size:13px;color:var(--muted)}.aside-note .small{color:#b5bdd1}main{margin-left:272px;padding:0 44px;max-width:1650px}header{display:flex;justify-content:space-between;padding:28px 0;border-bottom:1px solid var(--line);gap:15px}.breadcrumb,.edition{font-size:12px;font-weight:700;letter-spacing:.09em;color:var(--muted)}.breadcrumb span{margin:0 10px;color:#a9b0c0}.edition{white-space:nowrap}.heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin:35px 0 27px}h1{font-size:38px;letter-spacing:-.04em;line-height:1.12;margin:8px 0 12px}h2{font-size:23px;letter-spacing:-.025em;margin:0 0 14px}h3{font-size:18px;margin:0 0 8px}p{line-height:1.6;margin:8px 0;color:var(--muted)}.heading p{max-width:710px}.button{background:var(--purple);color:white;border:1px solid var(--purple);padding:12px 18px;border-radius:8px;font-weight:650;white-space:nowrap}.button.secondary{background:white;color:var(--ink);border-color:var(--line)}.button.good{background:#16684d;border-color:#16684d}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:28px}.stat{border:1px solid var(--line);border-radius:11px;background:white;padding:19px 22px}.stat strong{font-size:31px;font-weight:750;letter-spacing:-.04em;margin-right:12px}.stat span{font-size:14px;color:var(--muted)}.toolbar{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:22px}.segmented{display:flex;flex-wrap:wrap;gap:5px;background:#e7ebf4;padding:5px;border-radius:9px}.segmented button{background:transparent;border:0;padding:10px 15px;font-size:14px;border-radius:6px;color:var(--muted);font-weight:600}.segmented button.selected{background:white;color:var(--ink);box-shadow:0 2px 4px #14203910}.grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:24px}.list{display:grid;gap:11px}.card{background:white;border:1px solid var(--line);border-radius:10px;overflow:hidden}.card summary{list-style:none;cursor:pointer;display:flex;gap:15px;padding:21px;align-items:flex-start}.card summary::-webkit-details-marker{display:none}.card 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var(--line);border-radius:16px;padding:36px}.practice-card h2{font-size:29px;line-height:1.4;margin:29px 0}.practice-card .reveal{padding:22px;background:#f2effc;border-radius:10px;line-height:1.7;margin:22px 0}.actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.progress{height:6px;background:#e1e5f0;border-radius:5px;overflow:hidden;margin:20px 0}.progress span{display:block;height:100%;background:var(--purple)}label{font-size:14px;color:var(--muted)}select{margin-left:8px;padding:9px;border:1px solid var(--line);border-radius:7px;background:white;color:var(--ink)}.count{font-size:14px;color:var(--muted)}a{color:var(--purple)}footer{padding:32px 0;font-size:13px;line-height:1.6;color:var(--muted)}.empty{padding:30px;text-align:center}.correction{background:#eaf6f0;border-color:#218467}.linkbutton{border:0;background:none;color:var(--purple);text-decoration:underline;font:inherit;padding:0} @media(min-width:1500px){main{padding:0 64px}}@media(max-width:1100px){aside{width:235px;padding:28px 15px}main{margin-left:235px;padding:0 25px}.grid{grid-template-columns:1fr}.panel{display:none}.stat strong{display:block}.heading{align-items:flex-start}.heading .button{white-space:normal}}@media(max-width:760px){aside{position:relative;width:100%;height:auto;padding:19px 20px}.brand{font-size:14px}.brand-icon{font-size:20px}.course,.aside-note{display:none}nav{display:flex;overflow-x:auto;margin-top:18px;gap:5px}nav button{padding:11px;white-space:nowrap}nav button span{font-size:13px}main{margin-left:0;padding:0 19px}header{padding:18px 0}.edition{display:none}.breadcrumb{font-size:10px}.heading{display:block;margin:26px 0 22px}h1{font-size:32px}.heading .button{margin-top:15px}.stats{gap:8px}.stat{padding:14px 12px}.stat strong{font-size:27px}.stat span{font-size:12px}.reference-grid{grid-template-columns:1fr}.answer{padding:18px 22px}.card summary{padding:18px 14px}.practice-card{padding:23px}.practice-card h2{font-size:23px}.toolbar{align-items:flex-start}.segmented button{font-size:13px;padding:9px 10px}.wide-panel{padding:20px}}

/* Keep study content within its own responsive columns. */
.grid > *, .list, .card summary > div, .reference-grid > * { min-width: 0; }
.question, .answer, .source { overflow-wrap: anywhere; }