/* Scoped styles: existing course, tests and landing page remain unchanged. */
.dl-screen{--dl-accent:#2f6fed;--dl-soft:rgba(47,111,237,.08);color:var(--text);background:var(--bg)}
.dl-screen *, .dl-image-dialog *{box-sizing:border-box}.dl-screen [hidden]{display:none!important}.dl-top{height:82px;border-bottom:1px solid var(--border);display:flex;align-items:center;gap:26px;padding:0 4vw;background:var(--surface)}.dl-brand{background:none;border:0;font-size:29px;font-weight:800;color:var(--text);letter-spacing:-1.5px;padding:0}.dl-brand span{color:var(--blue)}.dl-top-label{font-size:10px;letter-spacing:1.5px;color:var(--text-muted);font-weight:700}.dl-top>.btn{margin-left:auto;font-size:12px}.dl-shell{display:grid;grid-template-columns:286px minmax(0,1fr);max-width:1540px;margin:0 auto}.dl-sidebar{border-right:1px solid var(--border);padding:30px 22px;position:sticky;top:0;height:100vh;overflow:auto;background:var(--surface)}.dl-overview{border:0;background:none;padding:0;color:var(--text-muted);font-size:12px;margin-bottom:30px;font-weight:600}.dl-eyebrow{font-size:10px;font-weight:700;letter-spacing:1.3px;line-height:1.8}.dl-search{display:block;margin:23px 0}.dl-search>span{display:block;font-size:10px;color:var(--text-muted);margin-bottom:8px}.dl-search input{width:100%;padding:11px 12px;border:1px solid var(--border);background:var(--bg);border-radius:8px;color:var(--text);font-size:12px}.dl-nav-group{margin-top:23px}.dl-nav-group>p{display:flex;align-items:center;gap:8px;font-size:10px;text-transform:uppercase;letter-spacing:.5px;line-height:1.6;font-weight:700;margin-bottom:8px;color:var(--text-muted)}.dl-nav-group>p>span{font-family:var(--font-mono);font-size:10px;color:var(--blue)}.dl-nav-lesson{border:0;background:none;color:var(--text-muted);text-align:left;display:grid;grid-template-columns:26px 1fr 12px;gap:5px;width:100%;padding:10px 8px;border-radius:7px;font-size:11px;line-height:1.6}.dl-nav-lesson>b{font-family:var(--font-mono);font-weight:500;font-size:10px}.dl-nav-lesson i{font-style:normal;color:var(--green)}.dl-nav-lesson:hover{background:var(--bg);color:var(--text)}.dl-nav-lesson.is-active{background:var(--dl-soft);color:var(--blue);font-weight:600}.dl-storage{font-size:10px;line-height:1.8;color:var(--text-muted);padding-top:25px;border-top:1px solid var(--border);margin-top:25px}.dl-main{padding:40px clamp(22px,4vw,66px) 60px;min-width:0}.dl-main h1:focus{outline:none}.dl-hero{background:#101f35;border-radius:18px;color:#fff;padding:36px 38px;position:relative;overflow:hidden}.dl-hero .dl-eyebrow{color:#a8c6f7}.dl-hero h1{font-size:clamp(32px,4vw,50px);line-height:1.18;margin:18px 0;max-width:620px;letter-spacing:-1.6px}.dl-hero h1 em{font-style:normal;color:#8cb7ff}.dl-hero>p{font-size:13px;line-height:1.95;color:#becbdd;max-width:490px;margin-bottom:24px}.dl-hero .btn{position:relative;z-index:1;font-size:12px}.dl-hero .btn span{margin-left:20px}.dl-hero-lines{position:absolute;right:20px;top:25px;display:grid;grid-template-columns:repeat(2,55px);gap:12px;transform:rotate(-12deg);opacity:.22}.dl-hero-lines span{border:1px solid #8eb7f1;border-radius:10px;padding:17px 0;text-align:center;font-family:var(--font-mono);font-size:12px}.dl-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:22px 0}.dl-stats>div{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:19px 22px}.dl-stats b{display:block;font-size:27px;letter-spacing:-1px}.dl-stats b small{font-size:14px;color:var(--text-muted);font-weight:400;letter-spacing:0}.dl-stats span{font-size:10px;color:var(--text-muted);display:block;margin-top:5px;line-height:1.7}.dl-method{display:flex;align-items:center;flex-wrap:wrap;gap:14px 22px;padding:16px 0 24px;border-bottom:1px solid var(--border);font-size:10px;color:var(--text-muted)}.dl-method b{color:var(--text)}.dl-method i{display:inline-grid;place-items:center;width:21px;height:21px;border-radius:50%;background:var(--dl-soft);color:var(--blue);font-style:normal;margin-right:5px}.dl-chapter{margin-top:35px}.dl-chapter>header{display:flex;align-items:center;gap:13px;margin-bottom:18px}.dl-chapter-number{font-family:var(--font-mono);font-size:21px;color:var(--blue);font-weight:600}.dl-chapter h2{font-size:18px;line-height:1.5}.dl-chapter header p{font-size:10px;color:var(--text-muted);margin-top:3px}.dl-chip{border:1px solid var(--border);padding:6px 10px;border-radius:20px;font-size:10px;white-space:nowrap;background:var(--surface);color:var(--text-muted)}.dl-chapter>header>.dl-chip{margin-left:auto}.dl-lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.dl-lesson-card{border:1px solid var(--border);border-radius:12px;background:var(--surface);padding:20px;text-align:left;color:var(--text);transition:border-color .15s,transform .15s;display:flex;flex-direction:column;min-height:188px}.dl-lesson-card:hover{border-color:var(--blue);transform:translateY(-2px)}.dl-card-top{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:15px}.dl-card-top b{font-size:11px;color:var(--blue);background:var(--dl-soft);padding:5px 8px;border-radius:5px;font-family:var(--font-mono)}.dl-card-top small{font-size:9px;color:var(--text-muted)}.dl-lesson-card h3{font-size:14px;line-height:1.6;margin-bottom:7px}.dl-lesson-card p{font-size:11px;color:var(--text-muted);line-height:1.7}.dl-card-bottom{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--blue);padding-top:18px;margin-top:auto}.dl-disclaimer{font-size:10px;color:var(--text-muted);line-height:1.9;border-top:1px solid var(--border);margin-top:38px;padding-top:22px}.dl-breadcrumb{display:flex;gap:9px;align-items:center;font-size:11px;color:var(--text-muted);margin-bottom:25px}.dl-breadcrumb button{border:0;background:none;color:var(--blue);padding:0;font-size:inherit}.dl-lesson-header h1{font-size:clamp(26px,3vw,38px);line-height:1.3;margin:10px 0 12px;letter-spacing:-1px}.dl-kicker{font-size:10px;color:var(--blue);letter-spacing:1px;font-weight:700}.dl-lesson-header>p{font-size:13px;line-height:1.8;color:var(--text-muted)}.dl-metrics{display:flex;flex-wrap:wrap;gap:10px 20px;font-size:10px;color:var(--text-muted);margin-top:18px}.dl-tabs{display:flex;border-bottom:1px solid var(--border);margin:27px 0 24px;gap:5px}.dl-tabs button{flex:1;border:0;background:none;border-bottom:3px solid transparent;padding:14px 7px;color:var(--text-muted);font-size:12px;font-weight:600}.dl-tabs button span{margin-left:5px}.dl-tabs button.is-active{border-color:var(--blue);color:var(--blue);background:var(--dl-soft);border-radius:7px 7px 0 0}.dl-toc{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:20px 24px;display:grid;gap:9px}.dl-toc b{font-size:12px;margin-bottom:3px}.dl-toc a{font-size:11px;color:var(--text-muted);text-decoration:none;line-height:1.7}.dl-toc a:hover{color:var(--blue)}.dl-reading{margin-top:22px;background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:0 30px}.dl-section{padding:28px 0;border-bottom:1px solid var(--border);scroll-margin-top:24px}.dl-section:last-child{border-bottom:0}.dl-section-num{font-family:var(--font-mono);color:var(--blue);font-size:10px;margin-bottom:8px}.dl-section h2{font-size:19px;line-height:1.5;margin-bottom:13px}.dl-section p,.dl-section li{font-size:13px;line-height:1.95;color:var(--text-muted)}.dl-section ul{padding-left:21px;margin:15px 0}.dl-section li{margin:8px 0;padding-left:3px}.dl-table-wrap{overflow:auto;margin-top:20px;border:1px solid var(--border);border-radius:8px}.dl-table-wrap table{width:100%;border-collapse:collapse;font-size:11px;text-align:left;line-height:1.8;min-width:340px}.dl-table-wrap th,.dl-table-wrap td{padding:12px 14px;border-bottom:1px solid var(--border);vertical-align:top}.dl-table-wrap thead{background:var(--dl-soft);color:var(--text)}.dl-table-wrap td{color:var(--text-muted)}.dl-table-wrap tbody th{font-weight:600;min-width:110px}.dl-table-wrap tr:last-child td,.dl-table-wrap tr:last-child th{border-bottom:0}.dl-code{background:#102036;color:#d3e4fb;border-radius:10px;margin-top:18px;overflow:hidden}.dl-code>span{font-size:8px;letter-spacing:1px;display:block;padding:12px 16px;border-bottom:1px solid #2b3c54;color:#8fa7c5}.dl-code pre{padding:17px;margin:0;overflow:auto;font-size:12px;line-height:1.9;white-space:pre;font-family:var(--font-mono)}.dl-figure{margin:24px 0 5px}.dl-zoom{display:block;position:relative;width:100%;border:1px solid var(--border);border-radius:9px;padding:18px;background:#fff}.dl-zoom img{display:block;max-width:100%;max-height:350px;margin:auto;object-fit:contain}.dl-zoom>span{position:absolute;bottom:8px;right:9px;font-size:9px;color:#466080;background:#ffffffeb;padding:4px 7px;border-radius:4px}.dl-figure figcaption{font-size:10px;color:var(--text-muted);line-height:1.8;margin-top:8px}.dl-extras,.dl-sources{border:1px solid var(--border);border-radius:10px;padding:17px 20px;margin-top:20px;background:var(--surface);font-size:12px}.dl-extras summary,.dl-sources summary{cursor:pointer;font-weight:600}.dl-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.dl-sources p,.dl-sources a{font-size:10px;line-height:1.9;color:var(--text-muted);margin-top:14px}.dl-sources a{display:block;color:var(--blue)}.dl-warning{border:1px solid #dbb65a;border-left:4px solid #d49c1c;background:var(--surface);padding:16px 20px;border-radius:9px;margin-bottom:22px;font-size:12px;line-height:1.9}.dl-warning b{color:#a56800}.dl-warning p{color:var(--text-muted);margin-top:4px}.dl-video-list{margin-top:30px}.dl-video-list>h2{font-size:19px;margin-bottom:10px}.dl-video-list>p{font-size:11px;color:var(--text-muted);line-height:1.9}.dl-video{margin-top:12px;border:1px solid var(--border);border-radius:10px;padding:17px 20px;background:var(--surface)}.dl-video summary{cursor:pointer;font-size:12px;line-height:1.8}.dl-video summary>span{color:var(--blue);font-size:10px;margin-left:10px}.dl-video [data-video-host]{margin:20px 0}.dl-video [data-video-host] p{font-size:10px;color:var(--text-muted);margin-top:12px;line-height:1.9}.dl-video iframe{width:100%;aspect-ratio:16/9;border:0;border-radius:7px}.dl-video>a{font-size:11px;color:var(--blue)}.dl-finish{display:flex;align-items:center;flex-wrap:wrap;gap:15px;background:var(--dl-soft);padding:24px;border-radius:12px;margin-top:28px}.dl-finish>div{flex:1 1 100%;}.dl-finish h2{font-size:17px;margin-bottom:8px}.dl-finish p{font-size:11px;color:var(--text-muted);line-height:1.8}.dl-finish .btn{font-size:12px}.dl-lesson-footer{display:flex;justify-content:space-between;gap:12px;margin-top:28px}.dl-lesson-footer .btn{font-size:11px}.dl-section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px}.dl-section-heading h2{font-size:18px;line-height:1.5}.dl-section-heading p{font-size:11px;line-height:1.8;color:var(--text-muted);margin-top:8px}.dl-memory,.dl-quiz,.dl-result{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:28px}.dl-flashcard{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:25px;width:100%;min-height:270px;margin:26px 0 18px;padding:30px;background:#102036;color:white;border:1px solid #244569;border-radius:14px;text-align:center}.dl-flashcard>span{font-size:9px;letter-spacing:2px;color:#94b5e0}.dl-flashcard strong{font-size:20px;line-height:1.8;font-weight:500;max-width:620px}.dl-flashcard small{font-size:10px;color:#a9bdd9}.dl-flashcard.is-flipped{background:var(--dl-soft);border-color:var(--blue);color:var(--text)}.dl-flashcard.is-flipped>span,.dl-flashcard.is-flipped small{color:var(--blue)}.dl-flash-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin:18px 0}.dl-flash-actions .btn{font-size:12px}.dl-card-nav{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:18px 0;border-top:1px solid var(--border);margin-top:25px}.dl-card-nav .btn{font-size:11px}.dl-card-nav>span{font-size:10px;color:var(--text-muted)}.dl-muted{color:var(--text-muted);font-size:11px;line-height:1.9}.dl-center{text-align:center}.dl-inline-status{font-size:11px;line-height:1.8;color:var(--blue);text-align:center;min-height:20px}.dl-quiz>.dl-muted{margin-top:12px}.dl-quiz-progress{height:4px;background:var(--border);border-radius:8px;margin:25px 0}.dl-quiz-progress span{display:block;height:100%;background:var(--blue);border-radius:8px}.dl-quiz h3{font-size:19px;line-height:1.7;margin-bottom:20px}.dl-options{margin:0 0 22px;padding:0;border:0;display:grid;gap:11px;min-width:0}.dl-option{display:flex;align-items:center;gap:12px;border:1px solid var(--border);border-radius:9px;padding:15px;cursor:pointer;font-size:12px;line-height:1.7;position:relative}.dl-option input{width:17px;height:17px;flex-shrink:0;accent-color:var(--blue)}.dl-option-letter{border:1px solid var(--border);border-radius:4px;padding:1px 6px;font-size:10px;color:var(--text-muted)}.dl-option.is-selected{border-color:var(--blue);background:var(--dl-soft)}.dl-option.is-correct,.dl-feedback.is-correct{border-color:var(--green);background:rgba(31,169,113,.08)}.dl-option.is-wrong,.dl-feedback.is-wrong{border-color:var(--red);background:rgba(229,72,77,.07)}.dl-option>b{font-size:10px;color:var(--green);margin-left:auto}.dl-feedback{border:1px solid;padding:17px;border-radius:8px;margin:15px 0 20px;font-size:12px;line-height:1.9}.dl-feedback p{margin-top:6px;color:var(--text-muted)}.dl-result h2{font-size:29px;margin:15px 0}.dl-result>p{font-size:12px;line-height:1.9;color:var(--text-muted)}.dl-result-actions{display:flex;gap:12px;flex-wrap:wrap;margin:22px 0}.dl-result-actions .btn{font-size:11px}.dl-review{border:1px solid var(--border);border-left:3px solid var(--green);border-radius:8px;padding:18px;margin:13px 0;font-size:12px;line-height:1.9}.dl-review.is-wrong{border-left-color:var(--red)}.dl-review p{font-size:11px;color:var(--text-muted);margin-top:8px}.dl-text-button{border:0;background:none;color:var(--blue);font-size:11px;padding:10px 0;text-decoration:underline}.dl-loading{max-width:750px;margin:auto;padding:70px 25px;line-height:2}.dl-loading p{margin:20px 0}.dl-image-dialog{width:min(1000px,94vw);max-height:92vh;background:var(--surface);color:var(--text);border:1px solid var(--border);border-radius:14px;padding:20px;overflow:auto}.dl-image-dialog::backdrop{background:rgba(6,15,29,.8)}.dl-image-dialog img{display:block;max-width:100%;max-height:72vh;margin:20px auto;background:white;object-fit:contain}.dl-image-dialog p{font-size:11px;line-height:1.8;color:var(--text-muted)}.dl-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(min-width:1500px){.dl-main{padding-left:75px;padding-right:75px}}
@media(max-width:1000px){.dl-shell{grid-template-columns:240px minmax(0,1fr)}.dl-sidebar{padding:25px 16px}.dl-main{padding:28px 24px}.dl-hero{padding:28px}.dl-hero-lines{display:none}.dl-stats>div{padding:15px}.dl-chapter>header{flex-wrap:wrap}.dl-chapter>header>.dl-chip{margin-left:0}.dl-chapter h2{font-size:16px}.dl-reading{padding:0 22px}.dl-lesson-card{padding:16px}.dl-card-top small{font-size:8px}}
@media(max-width:760px){.dl-top{height:auto;min-height:70px;padding:16px 20px;gap:12px;flex-wrap:wrap}.dl-top-label{display:none}.dl-top>.btn{padding:10px 12px}.dl-shell{display:block}.dl-sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--border);padding:16px 20px}.dl-sidebar>.dl-eyebrow,.dl-sidebar>.dl-overview{display:none}.dl-search{margin:0}.dl-nav{max-height:220px;overflow:auto;margin-top:15px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.dl-nav-group{margin:0}.dl-nav-group>p{font-size:9px}.dl-nav-lesson{font-size:10px;padding:8px 4px;grid-template-columns:24px 1fr 10px}.dl-storage{padding-top:12px;margin-top:14px;font-size:9px}.dl-main{padding:24px 18px 40px}.dl-hero{padding:27px 24px}.dl-hero h1{font-size:36px}.dl-hero p{font-size:12px}.dl-stats{gap:8px;margin:14px 0}.dl-stats>div{padding:14px 11px}.dl-stats b{font-size:23px}.dl-stats span{font-size:9px}.dl-method{gap:12px;font-size:9px;padding:10px 0 19px}.dl-method>b{flex-basis:100%}.dl-lesson-header h1{font-size:29px}.dl-lesson-header>p{font-size:12px}.dl-toc{padding:18px}.dl-reading{padding:0 19px}.dl-section h2{font-size:18px}.dl-section p,.dl-section li{font-size:12px}.dl-gallery{grid-template-columns:1fr}.dl-zoom{padding:12px}.dl-memory,.dl-quiz,.dl-result{padding:21px 18px}.dl-section-heading{align-items:flex-start}.dl-section-heading h2{font-size:17px}.dl-flashcard{padding:22px;min-height:250px}.dl-flashcard strong{font-size:18px}.dl-option{padding:12px 10px;gap:8px;font-size:11px}.dl-option-letter{display:none}.dl-lesson-footer .btn{padding:11px 12px;font-size:10px}.dl-chapter>header>.dl-chip{margin-left:auto}.dl-chapter>header{gap:10px}.dl-chapter header>div{max-width:72%}.dl-card-nav .btn{padding:10px 12px}.dl-quiz h3{font-size:17px}}
@media(max-width:420px){.dl-lesson-grid{grid-template-columns:1fr}.dl-chapter h2{font-size:15px}.dl-chapter-number{font-size:18px}.dl-chapter header>div{max-width:68%}.dl-chapter>header>.dl-chip{display:none}.dl-method{display:grid;grid-template-columns:1fr}.dl-tabs button{font-size:11px}.dl-tabs button span{margin-left:2px}.dl-nav{max-height:180px}.dl-figure figcaption{font-size:9px}}
@media(prefers-reduced-motion:reduce){.dl-lesson-card{transition:none}.dl-lesson-card:hover{transform:none}}
/* Reading sizes: comfortable on phones as well as large screens. */
.dl-section p,.dl-section li{font-size:14px}.dl-toc a{font-size:12px}.dl-nav-lesson{font-size:12px}.dl-lesson-card p{font-size:12px}.dl-option{font-size:13px}.dl-quiz>.dl-muted{font-size:12px}.dl-review p,.dl-feedback{font-size:13px}
@media(max-width:760px){.dl-section p,.dl-section li{font-size:14px}.dl-nav-lesson{font-size:11px}.dl-lesson-card p{font-size:12px}.dl-option{font-size:13px}.dl-toc a{font-size:12px}}
.dl-mobile-toggle{display:none}
@media(max-width:760px){.dl-mobile-toggle{display:flex;align-items:center;justify-content:space-between;width:100%;background:none;border:0;padding:4px 0;color:var(--text);font-size:12px;font-weight:600}.dl-sidebar .dl-search,.dl-sidebar .dl-nav{display:none}.dl-sidebar.is-nav-open .dl-search{display:block;margin-top:16px}.dl-sidebar.is-nav-open .dl-nav{display:grid}.dl-sidebar{padding-top:13px;padding-bottom:13px}.dl-sidebar .dl-storage{font-size:8px;border:0;padding:0;margin:8px 0 0;line-height:1.7}}
/* Friendly dashboard revision — shared Prep palette, surfaces and controls. */
.dl-top{background:var(--navy);color:#fff;border-bottom-color:rgba(255,255,255,.08);height:80px}.dl-brand{color:#fff}.dl-top-label{color:#a3b3c9;font-size:10px}.dl-top-actions{margin-left:auto;display:flex;align-items:center;gap:12px}.dl-top-back{background:none;border:0;color:#c5d2e4;font-size:12px;font-weight:600}.dl-theme-btn{height:38px;width:38px;border:1px solid #ffffff30;color:#dce6f6;border-radius:8px;background:#ffffff08;font-size:23px;line-height:1}.dl-top-actions>.btn{background:#ffffff09;color:#e5edfa;border:1px solid #ffffff30;font-size:12px;padding:10px 16px}.dl-top-actions>.btn:hover{background:#ffffff15;color:#fff}.dl-main{padding-top:34px}.dl-welcome{display:flex;justify-content:space-between;align-items:center;gap:25px;padding:8px 0 26px}.dl-welcome h1{font-size:38px;line-height:1.25;margin:12px 0 13px;letter-spacing:-.8px}.dl-welcome h1 span{color:var(--blue)}.dl-welcome p{font-size:14px;color:var(--text-muted);line-height:1.9;max-width:550px}.dl-course-emblem{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;width:130px;height:130px;flex-shrink:0;border-radius:20px;background:color-mix(in srgb,var(--violet) 8%,var(--surface));color:var(--violet);border:1px solid color-mix(in srgb,var(--violet) 16%,var(--border))}.dl-course-emblem svg{width:45px;height:45px}.dl-course-emblem span{font-size:8px;letter-spacing:1px;text-align:center;font-weight:700;line-height:1.7}.dl-resume-card{display:flex;align-items:center;gap:16px;padding:22px;background:var(--surface);border:1.5px solid var(--blue);border-radius:10px;box-shadow:0 3px 15px rgba(47,111,237,.04)}.dl-resume-icon{width:48px;height:48px;border-radius:12px;display:grid;place-items:center;flex-shrink:0;background:var(--dl-soft);color:var(--blue)}.dl-resume-icon svg{width:25px;height:25px}.dl-resume-copy{flex:1}.dl-resume-copy>span{font-size:9px;letter-spacing:1px;color:var(--blue);font-weight:700}.dl-resume-copy h2{font-size:17px;margin:4px 0;line-height:1.6}.dl-resume-copy p{font-size:11px;color:var(--text-muted);line-height:1.8}.dl-resume-card>.btn{font-size:12px;white-space:nowrap;border-radius:99px}.dl-stats-friendly{margin:18px 0 0;gap:14px}.dl-stats-friendly>div{display:flex;align-items:center;gap:13px;padding:18px;border-radius:10px}.dl-stats-friendly b{font-size:24px;line-height:1.1}.dl-stats-friendly b small{font-size:12px}.dl-stats-friendly>div>div>span{font-size:11px;margin-top:6px;color:var(--text-muted)}.dl-stat-icon,.dl-step-icon{display:grid!important;place-items:center;width:39px;height:39px;border-radius:10px;background:var(--dl-soft);color:var(--blue)!important;flex-shrink:0;margin:0!important}.dl-stat-icon svg,.dl-step-icon svg{width:21px;height:21px}.dl-purple{background:color-mix(in srgb,var(--violet) 10%,transparent);color:var(--violet)!important}.dl-teal{background:color-mix(in srgb,var(--teal) 10%,transparent);color:var(--teal)!important}.dl-path-progress{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:17px 21px;margin-top:14px}.dl-path-progress>div{display:flex;justify-content:space-between;gap:15px;font-size:11px;margin-bottom:10px}.dl-path-progress>div>span{font-weight:600}.dl-path-progress b{color:var(--blue);font-weight:500}.dl-path-progress progress{display:block;width:100%;height:6px;appearance:none;border:0;border-radius:8px;background:var(--border);overflow:hidden}.dl-path-progress progress::-webkit-progress-bar{background:var(--border)}.dl-path-progress progress::-webkit-progress-value{background:var(--blue);border-radius:8px}.dl-path-progress progress::-moz-progress-bar{background:var(--blue)}.dl-routine{margin:30px 0}.dl-routine-title h2,.dl-catalog-heading h2{font-size:20px;line-height:1.5}.dl-routine-title p,.dl-catalog-heading p{font-size:12px;color:var(--text-muted);margin-top:5px;line-height:1.8}.dl-routine-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:16px}.dl-routine-grid>div{border:1px solid var(--border);border-radius:10px;background:var(--surface);padding:20px}.dl-routine-grid b{font-size:14px;display:block;margin-top:14px}.dl-routine-grid p{font-size:12px;color:var(--text-muted);line-height:1.8;margin-top:7px}.dl-catalog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;border-top:1px solid var(--border);padding-top:28px}.dl-chapter-filters{display:flex;gap:8px;flex-wrap:wrap;margin-top:18px}.dl-chapter-filters button{border:1px solid var(--border);background:var(--surface);color:var(--text-muted);padding:8px 14px;border-radius:99px;font-size:12px}.dl-chapter-filters button.is-active{background:var(--blue);color:white;border-color:var(--blue)}.dl-chapter{margin-top:28px}.dl-chapter-overline{font-size:9px;letter-spacing:1px;font-weight:700;color:var(--text-muted)}.dl-chapter h2{font-size:18px;margin-top:3px}.dl-chapter-number{width:40px;height:40px;display:grid;place-items:center;border-radius:10px;background:color-mix(in srgb,var(--chapter-accent) 10%,transparent);color:var(--chapter-accent);flex-shrink:0}.dl-chapter-number svg{width:22px;height:22px}.dl-lesson-card{border-radius:10px;position:relative;padding:21px 22px;min-height:194px;overflow:hidden;transform:none!important}.dl-lesson-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--chapter-accent),color-mix(in srgb,var(--chapter-accent) 25%,var(--surface)))}.dl-lesson-card:hover{border-color:var(--chapter-accent);box-shadow:0 3px 14px rgba(15,27,45,.06)}.dl-card-top{margin-bottom:14px}.dl-card-top b{color:var(--chapter-accent);background:color-mix(in srgb,var(--chapter-accent) 8%,transparent);font-size:12px}.dl-card-top small{font-size:11px}.dl-lesson-card h3{font-size:16px}.dl-lesson-card p{font-size:13px;line-height:1.8}.dl-card-bottom{font-size:12px;color:var(--chapter-accent);padding-top:18px}.dl-card-bottom b{width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:color-mix(in srgb,var(--chapter-accent) 8%,transparent);font-size:14px}.dl-sidebar{background:var(--surface)}.dl-nav-lesson{padding-top:11px;padding-bottom:11px}.dl-screen .btn{font-size:13px}.dl-lesson-header h1{font-size:34px}.dl-lesson-header>p{font-size:14px}.dl-flashcard{background:var(--navy);border-color:var(--navy-2);border-radius:10px}.dl-memory,.dl-quiz,.dl-result,.dl-reading{border-radius:10px}.dl-tabs button{font-size:13px;padding-top:16px;padding-bottom:16px}.dl-metrics{font-size:11px}.dl-code{background:var(--navy)}
@media(max-width:1100px){.dl-course-emblem{display:none}.dl-welcome h1{font-size:33px}.dl-resume-card{flex-wrap:wrap}.dl-resume-card>.btn{margin-left:64px}.dl-stats-friendly>div{padding:15px;gap:9px}.dl-stat-icon{width:32px;height:32px}.dl-stats-friendly b{font-size:22px}.dl-stats-friendly>div>div>span{font-size:10px}.dl-routine-grid{gap:10px}.dl-routine-grid>div{padding:16px}.dl-lesson-header h1{font-size:30px}}
@media(max-width:760px){.dl-top{min-height:70px;height:auto;padding:15px 20px}.dl-top-actions{gap:8px}.dl-top-back{font-size:11px;padding:0}.dl-theme-btn{width:34px;height:34px}.dl-top-actions>.btn{font-size:11px;padding:8px 11px}.dl-welcome{padding:0 0 22px}.dl-welcome .dl-kicker{font-size:8px;letter-spacing:.7px}.dl-welcome h1{font-size:30px;margin-top:10px}.dl-welcome p{font-size:13px}.dl-main{padding-top:25px}.dl-resume-card{padding:18px;gap:12px}.dl-resume-icon{width:39px;height:39px}.dl-resume-copy{flex-basis:calc(100% - 55px)}.dl-resume-copy h2{font-size:15px}.dl-resume-copy>span{font-size:8px}.dl-resume-copy p{font-size:10px}.dl-resume-card>.btn{margin:4px 0 0;width:100%;border-radius:8px}.dl-stats-friendly{gap:8px;margin-top:13px}.dl-stats-friendly>div{display:block;padding:13px 10px}.dl-stat-icon{margin:0 0 12px!important;width:30px;height:30px}.dl-stat-icon svg{width:17px;height:17px}.dl-stats-friendly b{font-size:23px}.dl-stats-friendly b small{font-size:10px}.dl-stats-friendly>div>div>span{font-size:10px}.dl-path-progress{padding:15px}.dl-routine{margin:26px 0}.dl-routine-title h2,.dl-catalog-heading h2{font-size:19px}.dl-routine-grid{grid-template-columns:1fr;gap:10px}.dl-routine-grid>div{display:grid;grid-template-columns:36px 1fr;column-gap:12px;padding:15px}.dl-step-icon{width:34px;height:34px;grid-row:span 2}.dl-routine-grid b{font-size:13px;margin:0}.dl-routine-grid p{margin:3px 0 0;font-size:12px}.dl-catalog-heading{display:block;padding-top:22px}.dl-catalog-heading>.dl-chip{display:inline-block;margin-top:12px}.dl-chapter-filters{flex-wrap:nowrap;overflow:auto;padding-bottom:4px;gap:7px}.dl-chapter-filters button{white-space:nowrap;font-size:11px;padding:7px 12px}.dl-chapter h2{font-size:17px}.dl-chapter-overline{font-size:8px}.dl-lesson-card{padding:21px;min-height:180px}.dl-lesson-card h3{font-size:16px}.dl-lesson-card p{font-size:13px}.dl-card-top small{font-size:10px}.dl-sidebar .dl-storage{font-size:9px}.dl-lesson-header h1{font-size:29px}.dl-lesson-header>p{font-size:13px}.dl-tabs button{font-size:12px}.dl-metrics{font-size:10px}}

/* Reading edition: quieter layout, original long-form material. */
.dl-screen{--reader-font:17px}.dl-main{padding:36px clamp(22px,3.5vw,58px) 64px}.dl-top-label{letter-spacing:1px}.dl-library-intro{padding:8px 0 27px;border-bottom:1px solid var(--border)}.dl-library-intro h1{font-size:clamp(30px,3vw,43px);font-weight:650;line-height:1.16;letter-spacing:-1.2px;margin:14px 0 17px}.dl-library-intro h1>span{color:var(--violet)}.dl-library-intro>p:last-of-type{font-size:15px;line-height:1.8;color:var(--text-muted)}.dl-library-progress{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:25px;font-size:12px;color:var(--text-muted)}.dl-library-progress b{color:var(--text);font-size:16px}.dl-library-progress progress{width:145px;height:4px;border:0;appearance:none;border-radius:8px;overflow:hidden;background:var(--border)}.dl-library-progress progress::-webkit-progress-bar{background:var(--border)}.dl-library-progress progress::-webkit-progress-value{background:var(--violet)}.dl-library-progress progress::-moz-progress-bar{background:var(--violet)}.dl-continue{display:flex;gap:25px;justify-content:space-between;align-items:center;padding:23px 0;border-bottom:1px solid var(--border)}.dl-continue>div>span{font-size:9px;letter-spacing:1px;color:var(--text-muted);font-weight:650}.dl-continue h2{font-size:17px;margin:6px 0;line-height:1.5}.dl-continue p{font-size:12px;color:var(--text-muted);line-height:1.8}.dl-continue>.btn{border-radius:7px;font-size:13px;white-space:nowrap}.dl-catalog-heading{padding-top:32px;border:0}.dl-catalog-heading>span{font-size:12px;color:var(--text-muted)}.dl-chapter-filters{gap:7px;margin-top:18px}.dl-chapter-filters button{font-size:11px;padding:6px 11px;border-radius:6px;background:none}.dl-chapter-filters button.is-active{background:var(--dl-soft);color:var(--blue);border-color:transparent}.dl-syllabus-chapter{margin-top:30px}.dl-syllabus-chapter>header{display:flex;align-items:center;gap:12px;margin-bottom:10px}.dl-syllabus-chapter>header>span{font:12px var(--font-mono);color:var(--violet)}.dl-syllabus-chapter h2{font-size:15px;font-weight:650;line-height:1.6}.dl-syllabus-chapter>header>small{margin-left:auto;font-size:10px;color:var(--text-muted)}.dl-lesson-list{border:1px solid var(--border);border-radius:9px;overflow:hidden;background:var(--surface)}.dl-screen .dl-lesson-row{display:flex;align-items:center;gap:16px;border:0;border-bottom:1px solid var(--border);border-radius:0;min-height:88px;padding:17px 20px;box-shadow:none;width:100%;background:var(--surface)}.dl-lesson-row:last-child{border-bottom:0}.dl-lesson-row::before{display:none}.dl-screen .dl-lesson-row:hover{background:var(--dl-soft);box-shadow:none}.dl-row-number{font:11px var(--font-mono);color:var(--text-muted);flex-shrink:0}.dl-lesson-row>div{flex:1;min-width:0}.dl-lesson-row h3{font-size:14px;font-weight:600;line-height:1.6;margin:0 0 3px}.dl-lesson-row p{font-size:12px;line-height:1.7;margin:0}.dl-row-meta{font-size:10px;color:var(--text-muted);white-space:nowrap}.dl-row-arrow{color:var(--blue);font-size:17px;min-width:15px}.dl-lesson-header h1{font-size:clamp(28px,3vw,37px);font-weight:650;line-height:1.22;letter-spacing:-.8px;max-width:850px}.dl-lesson-header>p{max-width:720px}.dl-tabs{margin-top:25px;margin-bottom:0;gap:24px}.dl-tabs button{flex:0 1 auto;padding:13px 0;font-size:13px;border-bottom-width:2px}.dl-tabs button span{margin:0}.dl-tabs button.is-active{background:none;border-radius:0}.dl-reader-toolbar{position:sticky;top:0;z-index:4;display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:13px 0;background:var(--bg);border-bottom:1px solid var(--border);margin-bottom:27px}.dl-reading-switch{display:flex;align-items:center;gap:6px}.dl-reading-switch button,.dl-reading-tools button{border:0;background:none;font-size:11px;color:var(--text-muted);padding:7px 9px;border-radius:5px}.dl-reading-switch button.is-active{background:var(--surface);color:var(--text);box-shadow:0 0 0 1px var(--border);font-weight:600}.dl-reading-switch button>span{font-size:9px;margin-left:3px;color:var(--blue)}.dl-reading-tools{display:flex;align-items:center;gap:2px;margin-left:auto}.dl-reading-tools button:hover{background:var(--surface);color:var(--text)}.dl-reader-status{font-size:11px;color:var(--teal);flex-basis:100%;line-height:1.6}.dl-reader-status:empty{display:none}.dl-reading-layout{display:grid;grid-template-columns:minmax(0,760px) minmax(150px,200px);gap:32px;align-items:start}.dl-original-reader{min-width:0;background:var(--surface);border:1px solid var(--border);padding:30px 34px;border-radius:8px;font-size:var(--reader-font);line-height:1.9;overflow-wrap:anywhere}.dl-material-label{display:flex;align-items:center;gap:10px;justify-content:space-between;margin-bottom:24px;padding-bottom:15px;border-bottom:1px solid var(--border)}.dl-material-label>span{font-size:9px;letter-spacing:1px;color:var(--text-muted);font-weight:650}.dl-material-label a{font-size:10px;color:var(--text-muted);text-decoration:none}.dl-original-reader .dl-original-p{font-size:var(--reader-font);line-height:1.95;color:var(--text);margin:0 0 19px;white-space:normal;font-weight:400}.dl-original-reader .dl-original-h3{font-size:1.24em;line-height:1.45;letter-spacing:-.25px;font-weight:650;margin:38px 0 18px;scroll-margin-top:100px}.dl-original-reader .dl-original-h3:first-of-type{margin-top:24px}.dl-original-reader strong{font-weight:600}.dl-original-reader .dl-figure{margin:28px 0 34px}.dl-original-reader .dl-zoom{border:0;padding:16px;border-radius:5px}.dl-original-reader .dl-zoom img{max-height:430px}.dl-original-reader figcaption{font-size:11px;line-height:1.8;color:var(--text-muted)}.dl-outline{position:sticky;top:82px;max-height:calc(100vh - 110px);overflow:auto;padding:0 0 8px 16px;border-left:1px solid var(--border)}.dl-outline summary{font-size:11px;font-weight:600;color:var(--text-muted);cursor:pointer;line-height:1.7;margin-bottom:12px}.dl-outline nav{display:grid;gap:10px}.dl-outline a{font-size:11px;color:var(--text-muted);line-height:1.6;text-decoration:none;padding:3px 0}.dl-outline a:hover{color:var(--blue)}.dl-editor-note{font-size:12px;line-height:1.85;border-left:2px solid var(--amber);padding:3px 0 3px 15px;margin:20px 0 28px;color:var(--text-muted)}.dl-editor-note>b{font-size:11px;color:var(--text)}.dl-editor-note p{margin:4px 0}.dl-editor-note small{font-size:10px;line-height:1.7;display:block}.dl-original-syllabus,.dl-source-variant{margin:24px 0;padding:17px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.dl-original-syllabus summary,.dl-source-variant summary{font-size:12px;font-weight:600;cursor:pointer;color:var(--text-muted);line-height:1.8}.dl-original-syllabus .dl-original-p,.dl-original-syllabus .dl-original-h3{font-size:13px;line-height:1.8;margin:14px 0}.dl-shared-note,.dl-variant-note,.dl-material-source{font-size:11px!important;color:var(--text-muted);line-height:1.85;margin:20px 0}.dl-material-source{border-top:1px solid var(--border);padding-top:20px;margin-top:30px}.dl-source-variant>a{font-size:11px;color:var(--blue)}.dl-inline-video{margin:30px 0 36px}.dl-inline-video>figcaption{display:flex;gap:10px;align-items:center;margin-bottom:12px;line-height:1.7}.dl-inline-video>figcaption>span{font-size:8px;letter-spacing:1px;color:var(--blue);border:1px solid var(--border);padding:2px 5px;border-radius:3px}.dl-inline-video>figcaption>b{font-size:13px;font-weight:600;color:var(--text)}.dl-video-frame{position:relative;aspect-ratio:16/9;background:var(--navy);border:1px solid var(--border);border-radius:6px;overflow:hidden}.dl-video-frame iframe{width:100%;height:100%;display:block;border:0}.dl-inline-video>p{font-size:10px;line-height:1.8;color:var(--text-muted);margin-top:9px}.dl-inline-video a{color:var(--blue);text-decoration:none;white-space:nowrap}.dl-current-example{margin:30px 0}.dl-current-example h2{font-size:19px;margin-bottom:10px}.dl-current-example p{font-size:13px;color:var(--text-muted);line-height:1.8}.dl-current-example pre{font-size:13px;padding:18px;margin-top:12px;background:var(--navy);color:#e0e9f8;border-radius:6px;overflow:auto}.dl-finish{background:none;border-top:1px solid var(--border);border-radius:0;padding:24px 0}.dl-finish>div{flex-basis:auto;flex-grow:1}.dl-finish h2{font-size:16px}.dl-finish .btn{font-size:12px}.dl-reading{max-width:860px}.dl-reading .dl-section p,.dl-reading .dl-section li{font-size:15px;line-height:1.9}.dl-memory,.dl-quiz,.dl-result{margin-top:25px;max-width:860px}.dl-flashcard{background:var(--surface);border:1px solid var(--border);color:var(--text);border-radius:8px}.dl-flashcard>span{color:var(--blue)}.dl-flashcard small{color:var(--text-muted)}.dl-screen.is-reading-focus .dl-sidebar{display:none}.dl-screen.is-reading-focus .dl-shell{display:block;max-width:1250px}.dl-screen.is-reading-focus .dl-main{padding-left:40px;padding-right:40px}.dl-screen.is-reading-focus .dl-reading-layout{grid-template-columns:minmax(0,800px) minmax(150px,200px);justify-content:center}.dl-screen button:focus-visible,.dl-screen a:focus-visible{outline:2px solid var(--blue);outline-offset:3px}
@media(min-width:761px) and (max-width:1250px){.dl-reading-layout{display:flex;flex-direction:column;gap:18px}.dl-outline{position:static;order:-1;max-height:200px;overflow:auto;width:100%;padding:12px 16px;border:1px solid var(--border);border-radius:6px}.dl-outline nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}.dl-original-reader{padding:26px 28px}.dl-row-meta{display:none}}
@media(max-width:760px){.dl-main{padding:26px 18px 40px}.dl-library-intro{padding-top:2px}.dl-library-intro h1{font-size:30px;line-height:1.2;letter-spacing:-.8px}.dl-library-intro>p:last-of-type{font-size:13px}.dl-library-progress{gap:12px;font-size:11px}.dl-library-progress>span:last-child{flex-basis:100%}.dl-continue{gap:15px;align-items:flex-start;flex-direction:column;padding:20px 0}.dl-continue h2{font-size:16px}.dl-continue>.btn{padding:10px 14px}.dl-catalog-heading{padding-top:27px}.dl-catalog-heading h2{font-size:18px}.dl-chapter-filters{gap:6px}.dl-chapter-filters button{font-size:10px;padding:6px 8px}.dl-syllabus-chapter h2{font-size:13px}.dl-syllabus-chapter>header{gap:9px}.dl-screen .dl-lesson-row{padding:16px 13px;gap:12px;min-height:86px}.dl-lesson-row h3{font-size:13px}.dl-lesson-row p{font-size:11px}.dl-row-meta{display:none}.dl-row-number{font-size:10px}.dl-lesson-header h1{font-size:29px}.dl-tabs{gap:20px}.dl-tabs button{font-size:12px;white-space:nowrap}.dl-reader-toolbar{padding:10px 0;gap:8px;margin-bottom:18px}.dl-reading-switch button{font-size:10px;padding:6px 8px}.dl-reading-tools{margin-left:0;width:100%;justify-content:flex-end;gap:5px}.dl-reading-tools button{font-size:10px;padding:5px 8px}.dl-reading-layout,.dl-screen.is-reading-focus .dl-reading-layout{display:flex;flex-direction:column;gap:18px}.dl-original-reader{padding:21px 18px;border-radius:6px;width:100%;--reader-font:16px}.dl-original-reader .dl-original-p{line-height:1.9}.dl-original-reader .dl-original-h3{font-size:1.2em;margin-top:30px;scroll-margin-top:130px}.dl-outline{position:static;order:-1;max-height:150px;overflow:auto;padding:11px 14px;border:1px solid var(--border);border-radius:6px;width:100%}.dl-outline summary{font-size:11px;margin-bottom:4px}.dl-outline nav{gap:6px}.dl-outline a{font-size:10px}.dl-screen.is-reading-focus .dl-main{padding:24px 18px}.dl-inline-video{margin-left:-10px;margin-right:-10px}.dl-inline-video>figcaption,.dl-inline-video>p{padding:0 10px}.dl-inline-video>figcaption>b{font-size:12px}.dl-editor-note{font-size:11px}.dl-finish{gap:12px}.dl-finish>div{flex-basis:100%}.dl-finish h2{font-size:15px}.dl-screen .dl-finish .btn{font-size:11px}.dl-original-reader .dl-zoom{padding:6px}.dl-lesson-footer .btn{font-size:10px}.dl-memory,.dl-quiz,.dl-result{padding:21px 18px}}
@media(prefers-reduced-motion:reduce){.dl-screen *{scroll-behavior:auto!important;transition:none!important}}
.dl-screen .dl-lesson-row{flex-direction:row;text-align:left}.dl-screen .dl-lesson-row .dl-row-arrow{margin-left:3px}
.dl-original-rich{font-size:var(--reader-font);line-height:1.95;color:var(--text);margin-bottom:24px}.dl-original-rich>p{margin-bottom:18px}.dl-original-rich>h3{font-size:1.12em;font-weight:600;line-height:1.5;margin:25px 0 18px}.dl-source-table{max-width:100%;overflow:auto;margin:20px 0 30px;border:1px solid var(--border);border-radius:5px}.dl-source-table table{border-collapse:collapse;min-width:570px;width:100%;font-size:12px;line-height:1.8}.dl-source-table th,.dl-source-table td{padding:13px 14px;border:1px solid var(--border);text-align:left;vertical-align:top}.dl-source-table th{font-weight:600;background:var(--dl-soft)}.dl-source-table td:first-child{font-weight:600}.dl-source-table td{min-width:90px}.dl-source-table tr:last-child td{border-bottom:0}
/* Professional learning edition — editorial hierarchy, accessible controls. */
.dl-screen{--dl-accent:#2459ce;--dl-soft:rgba(36,89,206,.07)}
.dl-top{background:var(--surface);color:var(--text);border-bottom:1px solid var(--border);height:80px;padding:0 32px}
.dl-top .dl-brand{color:var(--text)}.dl-top .dl-top-label{color:var(--text-muted);font-size:14px;font-weight:500;text-transform:none;letter-spacing:0}
.dl-top-actions .btn,.dl-top-back,.dl-theme-btn{font-size:14px;min-height:44px;color:var(--text);border-color:var(--border)}.dl-theme-btn{width:44px}
.dl-shell{max-width:1640px;grid-template-columns:290px minmax(0,1fr)}
.dl-sidebar{background:var(--surface);padding:28px 20px}.dl-main{padding:40px clamp(24px,3vw,56px) 64px}
.dl-overview{font-size:14px;min-height:44px;margin-bottom:12px}.dl-eyebrow{font-size:14px;letter-spacing:.3px;font-weight:600;line-height:1.6}
.dl-search{margin:24px 0}.dl-search>span,.dl-search input{font-size:14px;line-height:1.5}.dl-search input{min-height:44px}
.dl-nav-group>p{font-size:14px;text-transform:none;letter-spacing:0;line-height:1.6}.dl-nav-group>p>span{font-size:14px}
.dl-nav-lesson{font-size:14px;line-height:1.5;grid-template-columns:30px 1fr 12px;gap:6px;padding:12px 8px;min-height:48px}.dl-nav-lesson>b{font-size:14px}.dl-storage{font-size:14px}
.dl-library-intro{display:grid;grid-template-columns:minmax(0,1fr) 220px;column-gap:36px;row-gap:24px;padding:4px 0 28px;border-bottom:0}
.dl-course-heading .dl-kicker{font-size:14px;letter-spacing:.8px;color:var(--dl-accent);font-weight:600;line-height:1.6}
.dl-library-intro h1{font-size:clamp(30px,2.8vw,44px);font-weight:650;line-height:1.12;letter-spacing:-1.25px;margin:18px 0 20px}
.dl-course-heading>p:last-child{font-size:16px;line-height:1.75;color:var(--text-muted);max-width:620px}
.dl-course-facts{border-left:1px solid var(--border);padding-left:24px;margin:6px 0 0}.dl-course-facts>span{font-size:14px;font-weight:600;color:var(--text-muted);letter-spacing:.5px}
.dl-course-facts dl{margin:16px 0}.dl-course-facts dl>div{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:9px 0;border-bottom:1px solid var(--border)}.dl-course-facts dt{font-size:14px;color:var(--text-muted)}.dl-course-facts dd{margin:0;font-size:21px;color:var(--text);font-weight:600;font-variant-numeric:tabular-nums}.dl-course-facts p{font-size:14px;line-height:1.65;color:var(--text-muted)}
.dl-library-progress{grid-column:1/-1;font-size:14px;gap:16px;margin-top:0;padding-top:8px}.dl-library-progress b{font-size:16px}.dl-library-progress progress{width:160px;height:6px}.dl-library-progress progress::-webkit-progress-value{background:var(--dl-accent)}
.dl-continue{padding:24px;border:1px solid var(--border);border-radius:10px;background:var(--surface);gap:22px;margin:8px 0 8px;position:relative;overflow:hidden}
.dl-continue::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--dl-accent)}
.dl-continue-number{font-size:28px;font-weight:500;letter-spacing:-1px;color:var(--text-muted);font-variant-numeric:tabular-nums;border-right:1px solid var(--border);padding-right:22px}
.dl-continue>div{flex:1;min-width:0}.dl-continue>div>span{font-size:14px;letter-spacing:.6px;color:var(--dl-accent)}.dl-continue h2{font-size:21px;line-height:1.4;margin:6px 0}.dl-continue p{font-size:14px;line-height:1.6}.dl-continue>.btn{font-size:14px;min-height:46px;padding:12px 18px}.dl-continue>.btn span{margin-left:14px}
.dl-catalog-heading{padding-top:32px}.dl-catalog-heading h2{font-size:24px;font-weight:600;letter-spacing:-.4px}.dl-catalog-heading>span{font-size:14px}
.dl-chapter-filters{gap:8px;margin:18px 0 26px}.dl-chapter-filters button{font-size:14px;min-height:44px;padding:9px 14px;border-radius:6px}.dl-chapter-filters button.is-active{color:var(--dl-accent);border-color:var(--dl-accent);background:var(--surface)}
.dl-syllabus-chapter{margin:28px 0 36px}.dl-syllabus-chapter>header{margin-bottom:14px}.dl-syllabus-chapter>header>span{font-size:14px;color:var(--dl-accent)}.dl-syllabus-chapter h2{font-size:18px}.dl-syllabus-chapter>header>small{font-size:14px;white-space:nowrap}.dl-lesson-list{border-radius:8px}
.dl-screen .dl-lesson-row{padding:22px 20px;min-height:96px;gap:20px;transform:none}.dl-row-number{font-size:14px;color:var(--text-muted)}.dl-lesson-row h3{font-size:16px;line-height:1.5;margin-bottom:5px}.dl-lesson-row p{font-size:14px;line-height:1.6}.dl-row-meta{font-size:14px}.dl-row-arrow{font-size:22px}.dl-disclaimer{font-size:14px}
.dl-kicker,.dl-breadcrumb,.dl-metrics{font-size:14px;line-height:1.6}.dl-breadcrumb button{min-height:44px}.dl-lesson-header>p{font-size:16px;line-height:1.7}.dl-tabs{gap:28px}.dl-tabs button{font-size:16px;min-height:48px}.dl-reading-switch button,.dl-reading-tools button{font-size:14px;min-height:44px}.dl-reading-switch button>span{font-size:14px}.dl-reader-status{font-size:14px}
.dl-material-label>span,.dl-material-label a,.dl-original-reader figcaption,.dl-outline summary,.dl-outline a{font-size:14px;line-height:1.6}.dl-material-label{gap:16px;align-items:flex-start}.dl-material-label>span{letter-spacing:0}.dl-material-label a{white-space:nowrap}
.dl-editor-note,.dl-editor-note>b,.dl-editor-note small,.dl-original-syllabus summary,.dl-source-variant summary,.dl-shared-note,.dl-variant-note,.dl-material-source,.dl-source-variant>a{font-size:14px!important;line-height:1.7}
.dl-source-table table,.dl-table-wrap table{font-size:14px}.dl-section p,.dl-section li{font-size:16px}.dl-toc b,.dl-toc a,.dl-inline-video>figcaption>span,.dl-inline-video>figcaption>b,.dl-inline-video>p{font-size:14px}.dl-inline-video a{white-space:normal}
.dl-finish h2{font-size:21px}.dl-finish p,.dl-screen .dl-finish .btn,.dl-lesson-footer .btn{font-size:14px}.dl-section-heading h2{font-size:22px}.dl-section-heading p,.dl-flashcard>span,.dl-flashcard small,.dl-card-nav span,.dl-muted,.dl-chip,.dl-options label,.dl-feedback,.dl-result p{font-size:14px;line-height:1.7}.dl-memory .btn,.dl-quiz .btn,.dl-result .btn{font-size:14px;min-height:44px}.dl-flashcard strong{font-size:24px;line-height:1.5}
@media(max-width:1350px){.dl-library-intro{grid-template-columns:1fr}.dl-course-facts{display:none}.dl-row-meta{display:none}}
@media(max-width:1000px) and (min-width:761px){.dl-shell{grid-template-columns:250px minmax(0,1fr)}.dl-sidebar{padding:24px 16px}.dl-main{padding:32px 24px}.dl-continue-number{display:none}.dl-continue{flex-wrap:wrap}.dl-continue>.btn{margin-top:6px}.dl-reading-layout{display:flex;flex-direction:column}.dl-outline{order:-1;position:static;width:100%;max-height:200px;overflow:auto}}
@media(max-width:760px){.dl-top{height:auto;min-height:76px;padding:14px 18px;gap:12px}.dl-top-label{display:none}.dl-top-actions{gap:8px}.dl-top-actions .btn,.dl-top-back,.dl-theme-btn{font-size:14px}.dl-shell{display:block}.dl-sidebar{padding:14px 18px;height:auto}.dl-mobile-toggle{font-size:14px;min-height:44px}.dl-main{padding:30px 18px 44px}.dl-library-intro{padding-top:0;gap:20px}.dl-library-intro h1{font-size:34px;letter-spacing:-1px;line-height:1.14;margin:16px 0}.dl-course-heading>p:last-child{font-size:16px;line-height:1.7}.dl-desktop-break{display:none}.dl-course-heading .dl-kicker{font-size:14px;letter-spacing:.3px}.dl-library-progress{font-size:14px;gap:12px}.dl-library-progress progress{flex:1;width:110px;min-width:70px}.dl-library-progress>span:last-child{flex-basis:100%}.dl-continue{padding:22px 18px;gap:14px;align-items:flex-start;flex-direction:column}.dl-continue-number{display:none}.dl-continue h2{font-size:20px}.dl-continue>div>span{font-size:14px}.dl-continue>.btn{width:100%;min-height:48px}.dl-catalog-heading h2{font-size:24px}.dl-catalog-heading>span{font-size:14px}.dl-chapter-filters{gap:8px;margin-top:18px}.dl-chapter-filters button{font-size:14px;min-height:44px;padding:8px 11px}.dl-syllabus-chapter h2{font-size:17px;line-height:1.5}.dl-syllabus-chapter>header{gap:8px;flex-wrap:wrap}.dl-syllabus-chapter>header>span{font-size:14px}.dl-syllabus-chapter>header>small{font-size:14px;margin-left:25px;flex-basis:100%}.dl-screen .dl-lesson-row{padding:20px 14px;gap:12px;align-items:flex-start}.dl-row-number{font-size:14px;padding-top:2px}.dl-lesson-row h3{font-size:16px}.dl-lesson-row p{font-size:14px}.dl-lesson-header h1{font-size:32px}.dl-tabs{gap:20px;justify-content:space-between}.dl-tabs button{font-size:16px;white-space:normal}.dl-reading-switch button,.dl-reading-tools button{font-size:14px;padding:8px}.dl-reading-switch button>span{font-size:14px}.dl-reading-tools{justify-content:flex-start;flex-wrap:wrap}.dl-reader-toolbar{gap:6px}.dl-outline summary,.dl-outline a{font-size:14px}.dl-original-reader{padding:22px 18px}.dl-original-reader .dl-original-p{font-size:var(--reader-font)}.dl-material-label{flex-direction:column;gap:8px}.dl-inline-video>figcaption>b,.dl-inline-video>p{font-size:14px}.dl-finish h2{font-size:20px}.dl-screen .dl-finish .btn,.dl-lesson-footer .btn{font-size:14px}.dl-lesson-footer{flex-wrap:wrap}.dl-memory,.dl-quiz,.dl-result{padding:24px 18px}.dl-flashcard{padding:24px 18px}.dl-flashcard strong{font-size:22px}}
.dl-screen .dl-sidebar .dl-storage{font-size:14px;line-height:1.65}
[data-theme="dark"] .dl-screen{--dl-accent:#8fb4ff;--dl-soft:rgba(143,180,255,.09)}
[data-theme="dark"] .dl-course-heading .dl-kicker,[data-theme="dark"] .dl-continue>div>span,[data-theme="dark"] .dl-syllabus-chapter>header>span{color:var(--dl-accent)}