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box-shadow .16s ease-out, transform .16s var(--ease);border-radius:12px;grid-template-columns:4.4rem 1fr;align-items:center;gap:2px 16px;padding:18px 20px;display:grid;position:relative}.part-tabs button:hover{border-color:var(--part);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.part-tabs button>b{color:var(--part);font:600 3rem/.8 var(--serif);letter-spacing:-.04em;grid-row:span 2}.part-tabs button>span{font-size:.92rem;font-weight:700}.part-tabs button>small{color:var(--ink-faint);font:.64rem var(--mono);letter-spacing:.06em;text-transform:uppercase}.part-tabs button[aria-pressed=true]{border-color:var(--ink);background:var(--ink);color:var(--paper);box-shadow:var(--shadow-md)}.part-tabs button[aria-pressed=true]>small{color:color-mix(in oklch, var(--paper) 70%, transparent)}.part-tabs 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var(--line);background:var(--paper-deep);color:var(--ink-faint);justify-content:space-between;align-items:center;gap:20px;padding:30px clamp(28px,6.5vw,104px);font-size:.78rem;display:flex}.site-footer p{margin:0}.site-footer a{align-items:center;gap:6px;display:inline-flex}.not-found{width:calc(100% - var(--sidebar));min-height:calc(100dvh - var(--topbar));padding:clamp(80px,12vw,150px) clamp(28px,8vw,100px)}.not-found h1{max-width:760px;margin:14px 0 18px;font-size:clamp(2.8rem,6vw,5.4rem)}.not-found h1 em{color:var(--rubric);font-weight:400}.not-found p{max-width:560px;color:var(--ink-soft);margin:0 0 30px;font-size:1.08rem}.course-view{width:calc(100% - var(--sidebar));min-width:0;padding-bottom:110px}.course-layout{grid-template-columns:minmax(0,780px) minmax(190px,240px);justify-content:center;gap:clamp(40px,6vw,90px);padding:0 clamp(24px,4vw,70px);display:grid}.course-hero{border-bottom:1px solid var(--line-strong);padding:40px clamp(24px,4vw,70px) 48px;position:relative}.course-hero:after{content:"";background:linear-gradient(90deg, var(--part) 0 160px, transparent 160px);height:3px;position:absolute;bottom:-1px;left:0;right:0}.course-hero-inner{max-width:calc(1020px + clamp(40px,6vw,90px));margin:0 auto}.course-article{min-width:0}.breadcrumb{color:var(--ink-faint);font:.68rem var(--mono);letter-spacing:.04em;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:46px;display:flex}.breadcrumb a{color:var(--ink-faint);text-decoration:none}.breadcrumb a:hover{color:var(--ink);text-decoration:underline}.course-kicker{color:var(--part);font:500 .68rem var(--mono);letter-spacing:.12em;text-transform:uppercase;flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:18px;display:flex}.course-kicker:before{content:"";background:var(--part);border-radius:2px;width:9px;height:9px;transform:rotate(45deg)}.course-kicker span+span:before{content:"·";color:var(--ink-faint);margin-right:10px}.course-hero h1{letter-spacing:-.035em;max-width:900px;margin:0 0 18px;font-size:clamp(3.1rem,5.6vw,6rem);line-height:.96}.course-hero-inner>p{max-width:640px;color:var(--ink-soft);font:400 1.35rem/1.42 var(--serif);margin:0}.course-meta{flex-wrap:wrap;align-items:center;gap:10px 34px;margin-top:30px;display:flex}.course-stats{gap:30px;margin:0;padding:0;display:flex}.course-stats div{gap:2px;display:grid}.course-stats dt{color:var(--ink-faint);font:500 .6rem var(--mono);letter-spacing:.1em;text-transform:uppercase;order:2}.course-stats dd{font:600 1.9rem/1 var(--serif);letter-spacing:-.02em;order:1;margin:0}.complete-button{border:1px solid var(--line-strong);background:var(--surface);min-height:46px;color:var(--ink-soft);cursor:pointer;border-radius:10px;align-items:center;gap:10px;margin-left:auto;padding:0 16px 0 13px;font-size:.84rem;font-weight:700;transition:border-color .16s ease-out,color .16s ease-out,background .16s ease-out;display:inline-flex}.complete-button:hover{border-color:var(--green);color:var(--green)}.complete-button.done{border-color:var(--green);background:var(--green-soft);color:var(--green)}.course-body{counter-reset:topic}.topic{scroll-margin-top:calc(var(--topbar) + 24px);border-bottom:1px solid var(--line);padding:72px 0 64px}.topic:focus,.course-hero h1:focus{outline:none}.topic-heading{grid-template-columns:64px 1fr;align-items:start;gap:6px;margin-bottom:32px;display:grid}.topic-heading>span{color:var(--rubric);font:italic 400 3.1rem/1 var(--serif);letter-spacing:-.04em;margin-top:-.05em}.topic-heading h2{letter-spacing:-.028em;margin:0;padding-top:.18em;font-size:clamp(2rem,3.1vw,3.1rem)}.lesson-copy{overflow-wrap:anywhere;min-width:0;max-width:100%;overflow-x:auto}.lesson-copy>p:first-child{color:var(--ink);font:400 1.28rem/1.5 var(--serif)}.lesson-copy p{margin:0 0 1.15em}.lesson-copy 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