@font-face{font-family:Geist;src:url('./assets/fonts/geist-latin.woff2') format('woff2');font-display:swap;font-weight:100 900;unicode-range:U+0000-00FF}@font-face{font-family:Geist;src:url('./assets/fonts/geist-latin-ext.woff2') format('woff2');font-display:swap;font-weight:100 900;unicode-range:U+0100-024F,U+1E00-1EFF}*{box-sizing:border-box}.study-reader{margin:0;color:#121519;background:#fbfcfe;font-family:Geist,Arial,sans-serif;font-size:16px;line-height:1.75}.study-reader a{color:#005dcc;text-underline-offset:4px}.study-reader a:hover{text-decoration:underline}.study-reader :focus-visible{outline:3px solid #005dcc;outline-offset:4px}.reader-skip{position:absolute;left:1rem;top:-6rem;background:white;padding:.6rem;z-index:10}.reader-skip:focus{top:1rem}.reader-header{border-bottom:1px solid #e1e5ea;background:#fbfcfe;position:sticky;top:0;z-index:3}.reader-header>div{max-width:1200px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:18px 28px;gap:1rem}.reader-brand{font-size:21px;font-weight:800;letter-spacing:-1px;line-height:1;text-decoration:none!important;color:#121519!important}.reader-brand span{color:#005dcc}.reader-header nav{display:flex;gap:24px;font-size:14px}.reader-header nav a{text-decoration:none}.reader-course{max-width:1000px;margin:0 auto;padding:70px 28px 60px}.reader-kicker{color:#59616b;font-size:12px;letter-spacing:.09em;text-transform:uppercase;font-weight:650}.study-reader h1{font-size:clamp(2rem,5vw,3.6rem);line-height:1.1;letter-spacing:-.055em;margin:.4em 0 .5em;overflow-wrap:anywhere}.reader-lead{font-size:20px;color:#505965;line-height:1.6;max-width:800px}.reader-facts{display:flex;flex-wrap:wrap;gap:10px;margin:24px 0}.reader-facts span{border:1px solid #dfe3e8;border-radius:30px;padding:5px 14px;font-size:13px}.reader-intro{max-width:780px}.reader-start{display:inline-block;background:#005dcc;color:white!important;border-radius:28px;padding:12px 22px;text-decoration:none;font-weight:600;margin:15px 0 25px}.reader-syllabus ol{list-style:none;padding:0;margin:0}.reader-syllabus li{display:grid;grid-template-columns:40px 1fr auto;gap:20px;padding:25px 0;border-top:1px solid #dfe3e8;align-items:start}.lesson-number{font-size:14px;color:#697481;padding-top:5px}.reader-syllabus h2{font-size:23px;line-height:1.3;margin:0}.reader-syllabus a{text-decoration:none}.reader-syllabus p{margin:8px 0;color:#505965}.reader-syllabus small{color:#68727e}.lesson-open{font-size:14px;padding-top:7px;white-space:nowrap}.reader-original{margin-top:45px;border-top:1px solid #dfe3e8;padding-top:20px}.reader-layout{max-width:1280px;margin:0 auto;display:grid;grid-template-columns:260px minmax(0,1fr);gap:44px;padding:36px 28px 60px}.reader-sidebar{position:sticky;top:94px;align-self:start;max-height:calc(100vh - 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.reader-more{border-top:1px solid #dfe3e8;margin-top:25px;padding-top:22px}.reader-more>summary{cursor:pointer;font-weight:600;color:#005dcc}.study-note,.study-exercise,.study-own{background:#f1f5fa;border-left:3px solid #005dcc;padding:16px 20px;margin:24px 0;border-radius:0 10px 10px 0}.study-note{font-size:14px}