.academy { padding-block: 52px 80px; }
.courses-body .topbar-nav a[aria-current] { color:var(--accent); }
.course-question { border-top:1px solid var(--nk-line); margin-top:30px; padding-top:26px; }
.quiz-number { font:11px var(--mono); color:var(--nk-muted); letter-spacing:.06em; }
.course-question h3 { font-size:19px; line-height:1.55; margin:12px 0 16px; }
.course-question textarea { display:block; width:100%; min-height:112px; resize:vertical; padding:14px 16px; border:1px solid var(--nk-line); border-radius:7px; background:var(--nk-surface); color:var(--nk-text); font:15px/1.7 var(--sans); }
.course-question textarea::placeholder { color:var(--nk-muted); }
.course-question textarea:focus-visible { outline:2px solid var(--accent); outline-offset:3px; }
.course-question textarea[aria-invalid] { border-color:#edbe7f; }
.quiz-input-meta { display:flex; flex-wrap:wrap; justify-content:space-between; gap:5px 12px; color:var(--nk-muted); font-size:11px; margin:7px 0 18px; }
.quiz-actions { display:flex; flex-wrap:wrap; gap:10px; }
.quiz-actions [hidden],.quiz-feedback[hidden] { display:none; }
.quiz-actions button:disabled { cursor:not-allowed; opacity:.5; }
.quiz-actions button:focus-visible { outline:2px solid var(--accent); outline-offset:4px; }
.course-question .quiz-status { font-size:12px; color:var(--nk-muted); margin:14px 0 0; }
.quiz-feedback { margin-top:18px; padding:20px; border:1px solid var(--nk-line); border-radius:8px; background:var(--nk-surface); }
.quiz-feedback h4 { font-size:18px; margin:0 0 14px; color:var(--nk-text); }
.quiz-feedback p,.quiz-feedback li { font-size:14px; line-height:1.7; }
.quiz-feedback ul { padding-left:20px; color:var(--nk-text); }
.quiz-feedback .quiz-feedback-label { margin-bottom:5px; font-weight:600; }
.quiz-feedback .quiz-assessment-note { font-size:12px; color:var(--nk-muted); }
.course-question[data-result="complete"] .quiz-feedback { border-color:var(--nk-line); }
.course-question[data-result="partial"] .quiz-feedback,.course-question[data-result="retry"] .quiz-feedback,.course-question[data-result="review"] .quiz-feedback { border-color:var(--nk-line); background:var(--nk-surface); }
.quiz-model { padding:12px 16px; border-left:2px solid var(--nk-line); background:var(--nk-surface); }
.quiz-model strong { font-size:12px; color:var(--nk-muted); }
.quiz-model p { margin-bottom:0; }
.academy-header { display:grid; grid-template-columns:1.4fr 1fr; gap:70px; align-items:center; }
.academy h1 { margin:18px 0 22px; font-size:clamp(36px,5vw,62px); line-height:1.06; letter-spacing:-.055em; }
.academy-header h1 span { color:var(--accent); }
.academy-header p,.lesson-header>p { color:var(--nk-muted); font-size:17px; max-width:650px; line-height:1.8; }
.academy-start { padding:28px; border:1px solid var(--nk-line); border-radius:12px; background:linear-gradient(135deg,#10211e,#0d1018); }
.academy-start h2 { font-size:24px; letter-spacing:-.035em; margin:14px 0; }
.academy-start p { font-size:14px; }
.academy-start .button { margin-top:12px; }
.academy-bar { display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between; gap:8px 24px; margin-top:40px; padding-block:16px; border-block:1px solid var(--border); font-size:13px; color:var(--nk-muted); }
.academy-bar p { margin:0; }.academy-bar strong { color:var(--text); }
.academy-categories { display:flex; flex-wrap:wrap; gap:10px; padding-block:22px 0; }
.academy-categories a { padding:8px 14px; border:1px solid var(--border); border-radius:6px; text-decoration:none; font-size:13px; color:var(--nk-muted); }
.academy-categories a:hover { border-color:var(--accent); color:var(--accent); }
.academy-group { margin-top:42px; scroll-margin-top:160px; }
.academy-group>header { display:flex; flex-wrap:wrap; align-items:baseline; gap:12px 22px; margin-bottom:16px; }
.academy-group h2 { margin:0; font-size:26px; letter-spacing:-.035em; }
.academy-grid { display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:16px; }
.course-card { min-width:0; display:flex; flex-direction:column; padding:24px; border:1px solid var(--border); border-radius:10px; background:var(--surface); text-decoration:none; transition:border-color .15s,background .15s; }
.course-card:hover { border-color:var(--nk-line); background:var(--nk-surface); }
.course-number { display:flex; justify-content:space-between; gap:12px; color:var(--accent); font:11px var(--mono); letter-spacing:.08em; }
.course-number>span { font-size:20px; }
.course-card h3 { font-size:21px; line-height:1.3; letter-spacing:-.025em; margin:19px 0 10px; }
.course-card>p { color:var(--nk-muted); font-size:14px; line-height:1.7; margin:0 0 20px; }
.course-tags { display:flex; gap:6px; flex-wrap:wrap; }
.course-tags span { font:11px/1.5 var(--mono); color:var(--nk-muted); padding:4px 8px; border:1px solid var(--nk-line); border-radius:4px; }
.course-card .course-tags { margin-top:auto; }
.course-read { color:var(--nk-text); display:flex; justify-content:space-between; margin-top:22px; padding-top:14px; border-top:1px solid var(--border); font-size:12px; font-weight:650; }
.academy-note { margin-top:40px; padding:24px 28px; border-left:3px solid var(--nk-line); background:var(--surface); }
.academy-note h2 { font-size:19px; margin:0 0 10px; }.academy-note p { color:var(--nk-muted); margin:0; max-width:950px; }
.lesson-breadcrumb { display:flex; flex-wrap:wrap; gap:12px; color:var(--nk-muted); font-size:13px; margin-bottom:25px; }
.lesson-breadcrumb a { text-underline-offset:5px; }
.lesson-header { max-width:900px; padding-bottom:34px; }.lesson-header h1 { font-size:clamp(34px,4.5vw,54px); }
.lesson-layout { display:grid; grid-template-columns:260px minmax(0,1fr); gap:60px; align-items:start; }
.lesson-sidebar { position:sticky; top:110px; padding:20px; border:1px solid var(--border); border-radius:8px; }
.lesson-sidebar h2 { font-size:13px; margin:0 0 15px; }.lesson-sidebar nav a { display:flex; gap:10px; padding:9px 0; text-decoration:none; color:var(--nk-muted); font-size:13px; }.lesson-sidebar nav a:hover { color:var(--accent); }.lesson-sidebar nav a span { color:var(--accent); font:11px/1.8 var(--mono); }
.lesson-prerequisites { border-top:1px solid var(--border); margin-top:18px; padding-top:20px; }.lesson-prerequisites p { color:var(--nk-muted); font-size:12px; }
.lesson-content { min-width:0; max-width:800px; }.lesson-section { border-top:1px solid var(--border); padding:30px 0; }.lesson-section,.lesson-exercise,.lesson-takeaway { scroll-margin-top:160px; }
.lesson-content h2 { font-size:26px; letter-spacing:-.035em; line-height:1.25; margin:14px 0 18px; }
.lesson-content p { color:var(--nk-text); font-size:16px; line-height:1.9; }
.lesson-example { margin:24px 0 0; border:1px solid var(--nk-line); border-radius:8px; overflow:hidden; background:var(--nk-surface); }
.lesson-example figcaption { padding:12px 20px; border-bottom:1px solid var(--nk-line); color:var(--nk-muted); font:10px var(--mono); letter-spacing:.08em; }
.lesson-example pre { padding:20px; margin:0; overflow-x:auto; color:#baf2df; font:13px/1.9 var(--mono); white-space:pre-wrap; overflow-wrap:anywhere; }
.example-reading { padding:18px 20px; border-top:1px solid var(--nk-line); background:var(--nk-surface); }.example-reading strong { color:var(--nk-text); font-size:13px; }.example-reading p { margin:8px 0 0; font-size:14px; }
.lesson-exercise { padding:28px; border:1px solid var(--nk-line); background:var(--nk-surface); border-radius:10px; }.lesson-exercise h2 { font-size:25px; }.lesson-exercise .exercise-hint { font-size:13px; color:var(--nk-muted); }
.lesson-exercise details { border-top:1px solid var(--nk-line); margin-top:22px; padding-top:16px; }.lesson-exercise summary { cursor:pointer; color:#a3f2d6; padding:8px 0; font-weight:650; font-size:14px; }.lesson-exercise details p { font-size:15px; }
.lesson-takeaway { padding:30px 0; }.lesson-takeaway h2 { color:var(--nk-text); font-size:24px; line-height:1.5; }
.lesson-sources { border-top:1px solid var(--border); padding:12px 0 22px; }.lesson-sources h2 { font-size:15px; }.lesson-sources a { color:var(--nk-text); font-size:13px; text-underline-offset:4px; }
.lesson-pagination { display:grid; grid-template-columns:1fr 1fr; gap:15px; border-top:1px solid var(--border); padding-top:26px; }.lesson-pagination a { display:flex; flex-direction:column; padding:20px; border:1px solid var(--border); border-radius:8px; text-decoration:none; gap:12px; }.lesson-pagination a:hover { border-color:var(--accent); }.lesson-pagination span { font:10px/1.6 var(--mono); color:var(--accent); }.lesson-pagination strong { font-size:15px; }
.courses-body a:focus-visible,.courses-body summary:focus-visible,.courses-body pre:focus-visible { outline:2px solid var(--accent); outline-offset:5px; }
@media(max-width:1000px) { .academy-header { gap:28px; }.academy-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }.lesson-layout { gap:28px; grid-template-columns:220px minmax(0,1fr); } }
@media(max-width:700px) { .academy { padding-top:28px; }.academy-header,.lesson-layout { grid-template-columns:1fr; }.academy-header { gap:20px; }.academy-start { padding:22px; }.academy-grid { grid-template-columns:1fr; }.academy-bar { margin-top:24px; }.lesson-sidebar { position:static; }.lesson-header { padding-bottom:24px; }.lesson-content h2 { font-size:23px; }.lesson-content p { font-size:15px; }.lesson-exercise { padding:22px; }.lesson-pagination { grid-template-columns:1fr; }.lesson-header h1 { overflow-wrap:anywhere; } }
@media(prefers-reduced-motion:reduce) { html { scroll-behavior:auto; }.course-card { transition:none; } }
@media print { .topbar,.footer,.lesson-sidebar,.lesson-pagination,.ambient-grid { display:none; }.lesson-layout { display:block; }.lesson-content { max-width:none; }.academy { width:100%; }.courses-body,.lesson-example,.example-reading,.lesson-exercise { background:white; color:black; }.lesson-content p,.lesson-example pre,.lesson-content h2 { color:black; } }