:root{--read:#20242d;--muted2:#667085;--paper:#fff;--soft2:#f6f8fb;--line2:#e4e8ef;--accent2:#4657d5;--accent-soft:#eef0ff;--success2:#edf8f2;--warm:#fff7e8}
body{background:#f5f7fa;color:var(--read)}
.course-hero{padding:56px 0 32px;background:linear-gradient(180deg,#fff 0,#f8f9fc 100%);border-bottom:1px solid var(--line2)}
.course-hero .eyebrow{font-weight:800;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent2)}
.course-hero h1{font-size:clamp(38px,5vw,62px);line-height:1.02;letter-spacing:-.045em;margin:10px 0 18px;max-width:900px}
.course-hero .lead{font-size:19px;line-height:1.65;max-width:840px;color:#505867}
.course-meta{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0 0}.meta-chip{background:#fff;border:1px solid var(--line2);border-radius:12px;padding:10px 13px;min-width:120px}.meta-chip strong{display:block;font-size:16px}.meta-chip span{display:block;color:var(--muted2);font-size:11px;margin-top:2px}
.course-overview{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:30px;padding:42px 0 72px}.course-main{min-width:0}.course-main>section{background:#fff;border:1px solid var(--line2);border-radius:20px;padding:28px;margin-bottom:18px}.course-main h2{font-size:30px;letter-spacing:-.025em;margin:0 0 14px}.course-main p,.course-main li{font-size:16px;line-height:1.72;color:#424b5b}.outcomes li{margin:8px 0}.course-sidebar{align-self:start;position:sticky;top:90px}.course-side-card{background:#fff;border:1px solid var(--line2);border-radius:20px;padding:20px;margin-bottom:14px}.course-side-card h3{margin:0 0 12px}.course-side-card p{font-size:13px;line-height:1.55;color:var(--muted2)}
.course-outline{list-style:none;padding:0;margin:0}.course-outline>li{border-top:1px solid var(--line2);padding:18px 0}.course-outline>li:first-child{border-top:0;padding-top:0}.module-title{font-weight:850;font-size:18px}.module-summary{color:var(--muted2);font-size:13px;margin:4px 0 10px}.section-list{list-style:none;padding:0;margin:0}.section-list li{padding:7px 0}.section-list a{text-decoration:none;color:#333d50}.section-list a:hover{color:var(--accent2);text-decoration:underline}.section-number{color:var(--muted2);font-variant-numeric:tabular-nums;margin-right:8px}.section-time{float:right;color:var(--muted2);font-size:11px}
.reader-shell{max-width:1220px;margin:0 auto;padding:34px 26px 80px;display:grid;grid-template-columns:260px minmax(0,760px) 180px;gap:30px;align-items:start}.reader-nav,.reader-tools{position:sticky;top:86px}.reader-nav{background:#fff;border:1px solid var(--line2);border-radius:16px;max-height:calc(100vh - 112px);overflow:auto;padding:15px}.reader-nav .course-name{font-weight:850;line-height:1.25;margin-bottom:13px}.reader-nav a{display:block;text-decoration:none;color:#596174;padding:7px 8px;border-radius:8px;font-size:12px;line-height:1.35}.reader-nav a.current{background:var(--accent-soft);color:#323eae;font-weight:750}.reader-nav a:hover{background:#f5f6fb}.reader-nav .mod{font-weight:800;color:#303745;margin-top:12px;padding:5px 8px;font-size:12px}
.reader-article{background:#fff;border:1px solid var(--line2);border-radius:22px;padding:42px 48px;box-shadow:0 10px 34px rgba(35,42,58,.04)}.reader-article .section-kicker{font-size:12px;color:var(--accent2);font-weight:850;letter-spacing:.065em;text-transform:uppercase}.reader-article h1{font-size:clamp(34px,4vw,50px);line-height:1.06;letter-spacing:-.04em;margin:9px 0 16px}.reader-article .intro{font-size:19px;line-height:1.72;color:#464f5e;margin-bottom:34px}.reader-article h2{font-size:28px;letter-spacing:-.025em;margin:42px 0 13px}.reader-article p{font-size:17px;line-height:1.78;color:#343c4a}.reader-article code{font-size:.92em}.concept-box{border-left:4px solid var(--accent2);background:#f7f8ff;border-radius:0 14px 14px 0;padding:18px 20px;margin:24px 0}.concept-box p{margin:0}.worked-example{background:#f7fafc;border:1px solid var(--line2);border-radius:16px;padding:22px;margin:24px 0}.worked-example h3,.activity-block h3,.discussion-box h3{margin:0 0 10px;font-size:20px}.activity-block{background:#fff7e8;border:1px solid #f1dfb3;border-radius:18px;padding:23px;margin:30px 0}.activity-block .activity-meta{font-size:12px;font-weight:800;color:#8d6513;text-transform:uppercase;letter-spacing:.06em}.activity-block textarea{width:100%;min-height:130px;border:1px solid #d7c79d;border-radius:10px;padding:12px;background:#fff;margin:12px 0}.discussion-box{background:#edf8f2;border:1px solid #cfe8d9;border-radius:16px;padding:20px;margin-top:12px}.discussion-box p{font-size:15px;line-height:1.7;margin:0}.keypoints{background:#f5f7fa;border-radius:16px;padding:22px;margin:32px 0}.keypoints h2{margin:0 0 10px;font-size:24px}.keypoints li{margin:7px 0;line-height:1.55}.reader-nextprev{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:36px}.reader-nextprev a{border:1px solid var(--line2);border-radius:14px;padding:14px;text-decoration:none;color:#30394a}.reader-nextprev a:last-child{text-align:right}.reader-nextprev small{display:block;color:var(--muted2);margin-bottom:4px}.reader-tools .toolbox{background:#fff;border:1px solid var(--line2);border-radius:14px;padding:14px;margin-bottom:12px}.reader-tools .toolbox strong{font-size:13px}.reader-tools .toolbox p{font-size:11px;color:var(--muted2);line-height:1.45}.reading-progress{height:7px;background:#e9ecf2;border-radius:99px;overflow:hidden;margin:8px 0}.reading-progress span{display:block;height:100%;background:var(--accent2)}
.program-intro{font-size:18px!important;line-height:1.7!important;max-width:870px}.level-course{background:#fff;border:1px solid var(--line2);border-radius:20px;padding:24px}.level-course .level-head{display:flex;justify-content:space-between;gap:12px}.level-course h2{font-size:28px;margin:6px 0 12px}.level-course p{color:#505867;line-height:1.6}.level-course .mini-meta{display:flex;gap:8px;flex-wrap:wrap;margin:12px 0}.level-course .mini-meta span{font-size:11px;background:#f3f5f8;border-radius:999px;padding:6px 9px}.course-levels{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.human-banner{background:#eef0ff;border:1px solid #d9dcff;border-radius:16px;padding:16px 18px;margin:20px 0;color:#3d46a6}.glossary-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.glossary-grid div{border-top:1px solid var(--line2);padding:10px 0}.glossary-grid strong{display:block}.glossary-grid span{font-size:13px;color:var(--muted2)}
@media(max-width:1060px){.reader-shell{grid-template-columns:220px minmax(0,1fr)}.reader-tools{display:none}.course-overview{grid-template-columns:1fr}.course-sidebar{position:static}.course-levels{grid-template-columns:1fr}}
@media(max-width:760px){.reader-shell{display:block;padding:18px 12px 60px}.reader-nav{position:static;max-height:none;margin-bottom:14px}.reader-article{padding:28px 22px}.course-hero{padding:38px 0 24px}.course-overview{padding-top:24px}.glossary-grid{grid-template-columns:1fr}.reader-nextprev{grid-template-columns:1fr}.reader-nextprev a:last-child{text-align:left}}