.academy-brand{display:flex;gap:9px;align-items:center;font-size:14px;line-height:1.3}.academy-brand span{flex:none}.academy-brand em{display:block;font-size:10px;letter-spacing:.09em;font-style:normal;color:#bfd6f4;margin-top:5px}.level-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.level-tabs button{background:white;border:1px solid var(--line);border-radius:10px;padding:10px 17px;color:var(--navy);font-weight:750}.level-tabs button[aria-pressed=true]{background:var(--navy);color:white}.lesson-tools{display:flex;gap:12px;align-items:end;flex-wrap:wrap;margin:18px 0}.lesson-tools label{display:grid;gap:5px;font-size:13px;font-weight:650}.lesson-tools input,.lesson-tools select{padding:11px;border:1px solid #c8d3e2;border-radius:9px;background:white;min-width:180px;font:inherit}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.lesson-card{background:white;border:1px solid var(--line);border-radius:14px;overflow:hidden}.lesson-card summary{cursor:pointer;padding:18px;font-weight:700;color:var(--navy)}.lesson-card summary small{display:block;font-size:11px;color:var(--muted);margin:6px 0 0 17px}.lesson-card[open]{grid-column:1/-1}.lesson-content{padding:0 20px 20px;max-width:850px}.lesson-step{border-top:1px solid var(--line);padding:17px 0}.lesson-step h4{margin:0 0 8px}.lesson-step p{margin:8px 0}.formula{font:600 14px/1.8 ui-monospace,monospace;padding:13px;background:#eef3ff;border-radius:9px;overflow-wrap:anywhere}.lesson-content blockquote{margin:10px 0;padding:12px 16px;border-left:3px solid #339b83;background:#f0f9f6}.lesson-content .error-note{background:#fff6e5;padding:12px;border-radius:9px}.academy-feedback{padding:12px;border-radius:9px;background:#eef5ff;margin-top:10px;line-height:1.7}.academy-feedback:empty{display:none}.lesson-grid .btn{margin-top:8px}.academy-status{min-height:24px;color:var(--muted)}.exam-clock{position:sticky;top:55px;z-index:3;display:flex;justify-content:space-between;gap:12px;padding:14px;background:#192b49;color:white;border-radius:12px}.exam-clock strong{font-variant-numeric:tabular-nums;font-size:22px}.academy-steps{display:flex;gap:8px;flex-wrap:wrap;font-size:12px}.academy-steps span{background:#edf1ff;padding:5px 9px;border-radius:15px}.chat-log{max-height:440px;overflow:auto;display:grid;gap:12px;margin:16px 0}.chat-bubble{padding:14px;border-radius:12px;background:#edf3ff;white-space:pre-wrap;overflow-wrap:anywhere}.chat-bubble.user{background:#ecf8f1;margin-left:30px}.chat-bubble.assistant{margin-right:30px}.chat-bubble b{display:block;font-size:11px;color:#68768d;margin-bottom:5px}.academy-textarea{width:100%;min-height:100px;padding:12px;border:1px solid #c8d3e2;border-radius:9px;font:inherit}.video-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.video-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;padding:15px}.video-card iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:9px}.video-card h3{margin-top:8px}.row{display:flex;gap:8px;align-items:center;flex-wrap:wrap}button:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid #cf8e2c;outline-offset:3px}button:disabled{opacity:.55;cursor:wait}.top{padding-right:220px}.nav{overflow:auto;max-height:calc(100vh - 180px)}@media(max-width:760px){.nav{max-height:none}.lesson-grid,.video-grid{grid-template-columns:1fr}.exam-clock{top:94px}.lesson-tools input{min-width:0;width:100%}}

/* The writing task is one labelled line per requirement, so its breaks must survive. */
.task-lines{white-space:pre-line}

/* Each example is named part by part, so the pattern above stops being a riddle. */
.parts{margin:10px 0 0;padding:11px 13px;border-radius:12px;background:#f6f3fb}
.parts-line{margin:0 0 7px;font-weight:600}
.parts ul{margin:0;padding-left:18px}
.parts li{margin:3px 0;line-height:1.5}
.parts .role{display:inline-block;padding:1px 7px;border-radius:999px;background:#e3dcf2;color:#4d4468;font-size:12px;font-weight:700}