:root{--ink:#172d3b;--muted:#60727c;--accent:#176d68;--line:#dce5e5;--paper:#fff;--bg:#f4f7f6}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.7 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei",sans-serif}header{background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:30px;padding:20px max(24px,calc((100vw - 1160px)/2));position:sticky;top:0;z-index:10}.brand{font-size:24px;font-weight:750;letter-spacing:-1px;color:var(--ink);white-space:nowrap}.brand span{font-weight:400;color:var(--accent);margin-left:5px}nav{display:flex;gap:25px;overflow:auto;white-space:nowrap}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}nav a{font-size:14px;color:var(--muted)}main{max-width:1160px;margin:auto;padding:44px 24px 70px}h1{font-size:34px;line-height:1.35;margin:10px 0 24px;letter-spacing:-1px}h2{font-size:23px;margin:30px 0 16px}h3{font-size:19px}p{margin:12px 0}.eyebrow,small,.muted{color:var(--muted);font-size:14px}.eyebrow{letter-spacing:1px}.lead{max-width:700px;color:var(--muted);font-size:18px}.stats{display:flex;gap:45px;border-block:1px solid var(--line);padding:22px 0;margin:28px 0}.stats strong{font-size:30px;display:block;color:var(--ink)}.stats span{font-size:13px;color:var(--muted)}.panel{background:var(--paper);border:1px solid var(--line);padding:26px;margin:22px 0;border-radius:10px}.task{border-left:4px solid var(--accent)}.row{padding:20px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;align-items:center}.row:last-child{border:0}.row h3{margin:0}.badge{font-size:12px;background:#e9f3ef;color:#226356;padding:4px 9px;border-radius:5px;display:inline-block;white-space:nowrap}.button,button{border:0;background:var(--accent);color:white;padding:11px 18px;border-radius:6px;font:inherit;cursor:pointer;display:inline-block}.secondary{background:#e7eeee;color:var(--ink)}button:disabled{opacity:.4;cursor:not-allowed}.grid{display:grid;grid-template-columns:2fr 1fr;gap:30px}.reading{max-width:820px;margin:auto;background:white;padding:40px;border:1px solid var(--line);border-radius:8px}.reading article{font-size:18px;line-height:1.95;overflow-wrap:anywhere}.reading h2{margin-top:38px;border-bottom:1px solid var(--line);padding-bottom:10px}.reading img{max-width:100%}pre{background:#152c38;color:#e6f0ef;padding:20px;overflow:auto;border-radius:6px;font-size:14px;line-height:1.6}code{font-family:ui-monospace,monospace}table{width:100%;border-collapse:collapse;display:block;overflow:auto}th,td{text-align:left;border-bottom:1px solid var(--line);padding:12px;vertical-align:top}label{display:block;margin:15px 0;color:var(--ink)}input:not([type=radio]),textarea,select{width:100%;padding:11px 12px;font:inherit;color:var(--ink);border:1px solid #c3d1d0;border-radius:5px;background:white}textarea{resize:vertical}input[type=radio]{accent-color:var(--accent);margin-right:12px}.option{border:1px solid var(--line);border-radius:6px;padding:12px 16px;cursor:pointer;margin:9px 0}.option:has(input:checked){border-color:var(--accent);background:#eff8f5}fieldset{border:0;border-bottom:1px solid var(--line);padding:24px 0}legend{font-weight:600;font-size:18px;padding:12px 0}.progress{position:sticky;top:90px;padding:14px;background:#eff6f3;border-radius:6px}.empty{padding:36px 0;color:var(--muted)}details{border-bottom:1px solid var(--line);padding:16px 0}summary{cursor:pointer;font-weight:600}.notice{padding:14px 18px;background:#edf4f1;color:#355e53;border-radius:6px}.error{background:#fff0e9;color:#8b3920}.actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap;margin-top:22px}footer{border-top:1px solid var(--line);padding:24px;text-align:center;color:var(--muted);font-size:12px}form.search{display:flex;gap:15px;align-items:end}form.search label{flex:1}ul{padding-left:23px}@media(max-width:760px){header{padding:14px 18px;display:block;position:static}nav{gap:22px;margin-top:12px;padding-bottom:4px}main{padding:26px 18px 45px}h1{font-size:28px}.grid{grid-template-columns:1fr}.reading{padding:22px 18px}.reading article{font-size:17px}.stats{gap:26px;flex-wrap:wrap}.stats strong{font-size:25px}.row{align-items:start;flex-direction:column;gap:10px}.panel{padding:20px}.progress{top:0}form.search{display:block}}
.course-tabs{display:flex;gap:30px;border-bottom:1px solid var(--line);margin:8px 0 30px;overflow:auto;padding-bottom:0}.course-tabs a{padding:12px 0;color:var(--muted);border-bottom:3px solid transparent;white-space:nowrap}.course-tabs a[aria-current=page]{border-bottom-color:var(--accent);color:var(--accent);font-weight:650}.login-page{min-height:100vh;display:grid;place-items:center;background:#edf2ef;padding:40px}.login-shell{width:min(1120px,100%);min-height:690px;display:grid;grid-template-columns:1.06fr 1fr;background:white;border:1px solid #dce4df;border-radius:18px;overflow:hidden;box-shadow:0 24px 80px #1a413011}.login-story{background:#163e3b;color:#edf5ef;padding:45px 48px;display:flex;flex-direction:column;justify-content:space-between}.login-story .brand{color:white;font-size:27px}.login-story .brand span{color:#b8d4bb}.login-story .eyebrow{color:#b5d1c1;font-size:13px}.login-story h1{font-size:38px;line-height:1.55;letter-spacing:-1px;margin:17px 0;color:#f6fbf5}.login-story p{font-size:15px;line-height:1.9;color:#c1d4cc}.login-story small{color:#a4c4b7;font-size:12px}.story-body{padding:38px 0}.story-steps{border-top:1px solid #ffffff22;margin-top:35px;padding-top:16px}.story-steps>div{display:flex;align-items:center;gap:22px;margin:16px 0}.story-steps span{color:#a6cdb7;font-family:ui-monospace,monospace;font-size:13px}.story-steps p{margin:0;font-size:13px;line-height:1.75}.story-steps strong{color:#edf5ef;font-size:15px;font-weight:550}.login-form-panel{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 50px;position:relative}.login-form-inner{width:100%;max-width:330px}.login-kicker{font-size:11px;letter-spacing:2px;color:#628077}.login-form-inner h2{font-size:30px;margin:13px 0 10px}.login-form-inner>.muted{font-size:14px;margin-bottom:36px}.login-form-inner label{font-size:14px;font-weight:550;margin-bottom:9px}.login-form-inner input{padding:14px;border-radius:7px;background:#fafcfb}.login-form-inner input:focus{outline:2px solid #9bc8b8;outline-offset:2px}.login-form-inner button{display:flex;width:100%;justify-content:space-between;padding:14px 18px;margin-top:22px;background:#245e51}.login-note{font-size:12px;color:#82938b;margin-top:22px}.login-bottom{position:absolute;bottom:30px;font-size:10px;letter-spacing:1.6px;color:#8a9b92}@media(max-width:760px){.login-page{padding:20px;display:block}.login-shell{display:flex;flex-direction:column;min-height:0;border-radius:12px}.login-story{padding:27px 28px}.story-body{padding:24px 0 4px}.login-story h1{font-size:27px;line-height:1.5}.login-story p{font-size:13px}.story-steps,.login-story>small{display:none}.login-form-panel{padding:36px 28px 75px}.login-form-inner h2{font-size:25px}.login-form-inner>.muted{margin-bottom:25px}.course-tabs{gap:24px}}

/* Compact learning workspace */
header{padding-top:15px;padding-bottom:15px}main{padding-top:28px;padding-bottom:44px}h1{font-size:30px;margin:0 0 22px}h2{font-size:21px;margin:24px 0 14px}h3{font-size:18px}a,button,input,textarea,select,summary{touch-action:manipulation}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #8cbbad;outline-offset:4px}input:focus-visible,textarea:focus-visible,select:focus-visible{outline:2px solid #8cbbad;outline-offset:2px}.stats{gap:0;padding:16px 0;margin:0 0 25px}.stats>div{min-width:150px;padding:0 28px;border-right:1px solid var(--line)}.stats>div:first-child{padding-left:0}.stats>div:last-child{border-right:0}.stats strong{font-size:27px;line-height:1.4}.dashboard-stats{border-top:0}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.section-heading h2{margin:0}.section-heading>a{font-size:13px}.learning-task{display:flex;align-items:center;justify-content:space-between;gap:24px;margin:14px 0 24px;padding:24px 28px;border-left:4px solid var(--accent)}.learning-task h3{font-size:23px;margin:7px 0 12px}.learning-task h3 a{color:var(--ink)}.learning-task .button{white-space:nowrap}.dashboard-bottom{display:grid;grid-template-columns:minmax(0,2fr) minmax(220px,1fr);gap:48px}.dashboard-bottom h2{margin-top:10px}.course-list .row{padding:17px 0}.course-list .muted{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;max-width:540px;margin-bottom:0}.course-list .row>div:last-child{flex-shrink:0}.activity-list>div{padding:11px 0;border-bottom:1px solid var(--line)}.activity-list span,.activity-list small{display:block}.activity-list span{font-size:14px}.activity-list small{font-size:12px;margin-top:3px}.panel{margin:16px 0;padding:24px}.panel>h2:first-child{margin-top:0}.row{padding:16px 0}.empty{padding:15px 0;font-size:14px}.course-tabs{margin:0 0 22px;gap:28px}.course-tabs a{padding:9px 0;font-size:14px}.course-summary{display:flex;justify-content:space-between;gap:24px;align-items:center;background:white;border:1px solid var(--line);border-radius:9px;padding:20px 24px}.course-summary p{margin:0 0 10px}.course-progress{font-size:14px;color:var(--muted)}.course-progress strong{color:var(--ink)}progress{width:240px;max-width:100%;height:6px;accent-color:var(--accent);border:0;border-radius:4px;display:block}progress::-webkit-progress-bar{background:#e8efec;border-radius:4px}progress::-webkit-progress-value{background:var(--accent);border-radius:4px}.lesson-directory{background:white;border:1px solid var(--line);border-radius:9px;padding:18px 24px;margin-bottom:22px}.lesson-directory>h3{font-size:13px;color:var(--muted);margin:0 0 8px;font-weight:500}.lesson-directory>h3:not(:first-child){margin-top:24px}.lesson-number{display:inline-block;color:var(--muted);font:13px ui-monospace,monospace;width:36px}.course-plan{font-size:15px}.course-plan summary{padding:3px 0}.reading{padding:32px 38px;max-width:850px}.reading article{line-height:1.85}.reading h2{margin-top:30px;padding-bottom:8px}.reading article>h2:first-child{margin-top:18px}.reading p{margin:14px 0}.reading section{scroll-margin-top:90px}fieldset{padding:18px 0}legend{padding:8px 0}.option{padding:10px 14px}.progress{top:74px;padding:10px 14px}footer{padding:16px}.search{margin-bottom:12px}.search button{margin-bottom:15px}
@media(max-width:760px){main{padding:23px 18px 32px}h1{font-size:26px;margin-bottom:18px}.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:0}.stats>div{min-width:0;padding:0 8px}.stats strong{font-size:23px}.stats span{font-size:11px}.learning-task{padding:20px;align-items:flex-start;flex-direction:column;gap:16px}.learning-task h3{font-size:20px}.dashboard-bottom{grid-template-columns:1fr;gap:18px}.course-list .row>div:last-child{display:flex;align-items:center;gap:12px}.course-list .row>div:last-child p{margin:0}.course-summary{padding:18px;gap:16px;align-items:flex-start;flex-direction:column}.lesson-directory{padding:17px 18px}.lesson-directory .row{flex-direction:row;align-items:center}.reading{padding:22px 18px}.reading article{font-size:17px}.course-tabs{gap:22px}.progress{top:0}.search button{margin-bottom:0}}

/* Course reading: navigation rail + editorial paper */
.lesson-page{background:#f5f7f6}.lesson-page main{max-width:1360px;padding:24px 32px 52px}.lesson-workspace{display:grid;grid-template-columns:248px minmax(0,1fr);gap:38px;align-items:start}.lesson-sidebar{position:sticky;top:94px;max-height:calc(100vh - 118px);overflow-y:auto;scrollbar-width:thin;padding-right:10px}.directory-disclosure{padding:0;border:0}.directory-disclosure>summary{font-size:12px;letter-spacing:1px;color:var(--muted);padding:4px 0 16px;list-style:none}.directory-disclosure>summary::-webkit-details-marker{display:none}.directory-course{font-size:17px;line-height:1.5;font-weight:650;display:block;color:var(--ink);margin-bottom:22px}.directory-stage{font-size:11px;line-height:1.6;color:#7d8b91;margin:20px 0 10px}.lesson-directory-nav{display:block;white-space:normal;overflow:visible}.directory-lesson{display:flex;align-items:flex-start;gap:11px;padding:12px;border-radius:7px;font-size:13px;line-height:1.55;margin:4px 0;color:#475c65}.directory-lesson small{display:block;font-size:10px;color:#83928f;margin-top:4px}.directory-number{font:11px/1.9 ui-monospace,monospace;color:#8b9b99}.directory-lesson.is-current{background:#e5efeb;color:#185e52;font-weight:600}.directory-lesson.is-current .directory-number{color:#367d6f}.directory-lesson.is-locked{color:#94a09f}.chapter-directory{border-top:1px solid var(--line);margin-top:22px;padding-top:16px}.directory-label{font-size:11px;letter-spacing:1px;color:#7d8b91;margin:0 0 10px}.chapter-directory nav{display:block;white-space:normal;overflow:visible}.chapter-link{display:block;line-height:1.6;padding:7px 10px 7px 13px;font-size:12px;border-left:2px solid transparent;color:#64767c}.chapter-link.subchapter{padding-left:23px;font-size:11px}.chapter-link.is-active{border-left-color:var(--accent);background:#ecf2ef;color:#185e52}.directory-progress{display:block;font-size:12px;margin-top:22px;padding:16px 0;border-top:1px solid var(--line)}.lesson-main{min-width:0}.lesson-breadcrumb{display:flex;flex-wrap:wrap;gap:8px;color:#91a09f;font-size:11px;line-height:1.8;margin:0 0 17px}.lesson-breadcrumb a{color:#748785}.lesson-paper{max-width:none;width:100%;padding:42px 52px;border:1px solid #e1e7e3;border-radius:10px;box-shadow:0 6px 28px #233e3210}.lesson-heading{border-bottom:1px solid var(--line);padding-bottom:24px;margin-bottom:29px}.lesson-meta{display:flex;gap:12px;align-items:center;flex-wrap:wrap;font-size:11px;color:#7e8d89}.lesson-meta>span:first-child{font:11px ui-monospace,monospace;letter-spacing:1px;color:var(--accent)}.lesson-heading h1{font-size:31px;line-height:1.5;margin:17px 0 18px;letter-spacing:-.8px}.lesson-tools{display:flex;gap:20px;font-size:11px}.lesson-tools a{color:#6f8580}.lesson-tools a:last-child{margin-left:auto;color:#8b9b96}.lesson-paper article{font-size:17px;line-height:1.95;letter-spacing:.15px;color:#30434a}.lesson-paper article h2{font-size:22px;line-height:1.6;margin:38px 0 18px;padding-bottom:0;border:0;letter-spacing:-.3px;color:#172f37;scroll-margin-top:100px}.lesson-paper article h3{font-size:18px;line-height:1.7;margin:26px 0 12px;scroll-margin-top:100px}.lesson-paper article>h2:first-child{margin-top:0}.lesson-paper article p{margin:16px 0}.lesson-paper article li{margin:8px 0}.lesson-paper article strong{font-weight:650;color:#233b42}.lesson-paper blockquote{margin:24px 0;padding:15px 22px;border-left:3px solid #6e9b8d;background:#f1f6f3;border-radius:0 7px 7px 0;color:#3e5e55}.lesson-paper blockquote p{margin:6px 0}.lesson-paper figure{margin:28px 0}.lesson-paper img{display:block;max-width:100%;height:auto;border-radius:8px;margin:24px auto;background:#f4f6f5}.lesson-paper figure img{margin:0 auto}.lesson-paper figcaption{text-align:center;color:#82918b;font-size:12px;line-height:1.7;margin-top:11px}.lesson-paper table{font-size:14px;line-height:1.8;margin:24px 0;border:1px solid var(--line);border-radius:7px}.lesson-paper th{background:#edf3ef;color:#36544a;font-weight:600}.lesson-paper td,.lesson-paper th{padding:12px 16px;min-width:105px}.lesson-paper tr:last-child td{border-bottom:0}.lesson-paper :not(pre)>code{background:#eef3ef;padding:2px 5px;border-radius:4px;font-size:.88em;color:#285d50}.lesson-paper pre{margin:24px 0;font-size:13px}.lesson-paper hr{border:0;border-top:1px solid var(--line);margin:32px 0}.lesson-paper>section{border-top:1px solid var(--line);margin-top:40px;padding-top:12px;scroll-margin-top:95px}.lesson-paper>section>h2{border:0;margin:18px 0;font-size:23px}.lesson-paper .progress{font-size:13px}.lesson-paper .actions:empty{display:none}.lesson-paper .option{font-size:15px}.lesson-paper legend{font-size:16px}.lesson-paper .actions{border-top:1px solid var(--line);padding-top:22px}.lesson-paper .actions a{font-size:13px}
@media(min-width:1500px){.lesson-page main{max-width:1450px}.lesson-workspace{gap:52px;grid-template-columns:260px minmax(0,1fr)}.lesson-paper{padding:48px 68px}.lesson-paper article{font-size:18px}}
@media(max-width:1100px){.lesson-page main{padding:22px}.lesson-workspace{grid-template-columns:210px minmax(0,1fr);gap:24px}.lesson-paper{padding:32px}.lesson-heading h1{font-size:27px}}
@media(max-width:900px){.lesson-workspace{display:block}.lesson-sidebar{position:sticky;top:0;max-height:60vh;z-index:9;padding:0;background:#f5f7f6;border:1px solid var(--line);border-radius:7px;margin-bottom:18px;box-shadow:0 2px 10px #213e3210}.directory-disclosure>summary{padding:13px 17px;font-size:13px;color:var(--ink);letter-spacing:0}.directory-disclosure>summary:after{content:'展开';float:right;font-size:11px;color:var(--accent)}.directory-disclosure[open]>summary:after{content:'收起'}.directory-body{padding:4px 17px 12px}.directory-course{margin-bottom:12px}.lesson-breadcrumb{margin-bottom:13px}.lesson-paper{padding:30px}.lesson-heading h1{font-size:27px}.lesson-page main{padding:18px}}
@media(max-width:560px){.lesson-page main{padding:14px 12px 30px}.lesson-paper{padding:25px 20px;border-radius:8px}.lesson-heading{padding-bottom:20px;margin-bottom:23px}.lesson-heading h1{font-size:25px;margin:14px 0 17px}.lesson-meta{font-size:10px;gap:8px}.lesson-paper article{font-size:16px;line-height:1.95}.lesson-paper article h2{font-size:20px;margin-top:30px}.lesson-paper article h3{font-size:17px}.lesson-paper table{font-size:13px}.lesson-tools{gap:16px}.lesson-paper blockquote{padding:12px 16px}.lesson-paper>section{margin-top:30px}.lesson-paper .option{padding:11px;font-size:14px}.lesson-breadcrumb{font-size:10px}}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}

.lesson-paper .table-scroll{max-width:100%;overflow-x:auto;margin:24px 0;border:1px solid var(--line);border-radius:7px}.lesson-paper .table-scroll table{display:table;width:100%;margin:0;border:0;border-radius:0}
/* Readable course navigation */
.lesson-workspace{grid-template-columns:288px minmax(0,1fr);gap:32px}.lesson-sidebar{padding-right:12px}.directory-disclosure>summary{font-size:14px;font-weight:650;letter-spacing:0;color:#425b62;padding-bottom:16px}.directory-course{font-size:19px;font-weight:700;color:#18333c;margin-bottom:20px}.directory-stage{font-size:13px;font-weight:500;color:#536b72;line-height:1.75}.directory-lesson{font-size:15px;line-height:1.75;padding:13px 12px;font-weight:500;color:#334f58}.directory-lesson small{font-size:12px;font-weight:400;color:#526e68;margin-top:3px}.directory-number{font-size:12px;color:#617c79}.directory-lesson.is-current{color:#135b4e;background:#e0ede7;font-weight:650}.directory-label{font-size:13px;font-weight:650;letter-spacing:0;color:#425b62;margin-bottom:12px}.chapter-link{font-size:15px;line-height:1.8;font-weight:500;color:#3f5962;padding:10px 12px 10px 15px;margin:2px 0;overflow-wrap:break-word}.chapter-link.subchapter{font-size:14px;line-height:1.8;color:#4e666d;padding-left:27px}.chapter-link:hover{background:#eaf0ed;text-decoration:none;color:#174e43}.chapter-link.is-active{font-weight:650;border-left-width:3px;color:#114f43;background:#e1ede7}.directory-progress{font-size:14px;font-weight:550;color:#23695b}.directory-lesson.is-locked,.directory-lesson.is-locked small{color:#667c80}
@media(min-width:1500px){.lesson-workspace{grid-template-columns:300px minmax(0,1fr);gap:40px}}
@media(min-width:901px) and (max-width:1100px){.lesson-workspace{grid-template-columns:250px minmax(0,1fr);gap:24px}.chapter-link{font-size:14px}.chapter-link.subchapter{font-size:13px}}
@media(max-width:900px){.directory-disclosure>summary{font-size:15px}.chapter-link{font-size:15px}.directory-course{font-size:18px}}

/* Course center: compact, distinct course cards */
.course-catalog{margin-top:4px}.catalog-search.search{display:grid;grid-template-columns:minmax(0,1fr) 240px auto;gap:14px;align-items:end;margin:0 0 22px;padding:18px 20px;background:#fff;border:1px solid var(--line);border-radius:10px}.catalog-search.search label{margin:0;font-size:13px;font-weight:550;line-height:1.5}.catalog-search.search input,.catalog-search.search select{margin-top:7px;height:44px;font-size:14px}.catalog-search.search button{height:44px;margin:0;padding:0 24px;font-size:14px}.catalog-toolbar{display:flex;align-items:center;justify-content:space-between;margin:0 0 12px;font-size:13px;color:#526870}.catalog-toolbar strong{font-weight:600;margin-left:5px;color:var(--ink)}.catalog-toolbar>a{font-size:13px}.catalog-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}.catalog-card{min-width:0;display:flex;flex-direction:column;padding:23px 24px 21px;background:white;border:1px solid #d6e2de;border-radius:12px;box-shadow:0 3px 12px #203c3005;transition:border-color .18s,box-shadow .18s}.catalog-card:hover{border-color:#91b5a9;box-shadow:0 5px 18px #203c300c}.catalog-card-top{display:flex;justify-content:space-between;gap:16px;align-items:center;font-size:12px;line-height:1.6}.catalog-category{color:#286b5e;background:#eef5f1;border-radius:4px;padding:3px 8px;overflow-wrap:anywhere}.catalog-count{color:#526870;white-space:nowrap}.catalog-card h2{font-size:21px;line-height:1.5;letter-spacing:-.3px;margin:15px 0 9px;overflow-wrap:anywhere}.catalog-card h2 a{color:#193740}.catalog-description{color:#536971;font-size:14px;line-height:1.85;margin:0 0 22px;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.catalog-card-bottom{display:flex;align-items:center;gap:24px;margin-top:auto;padding-top:17px;border-top:1px solid #e7eeeb}.catalog-progress{flex:1;min-width:0}.catalog-progress>div{display:flex;justify-content:space-between;gap:10px;font-size:12px;color:#526870;margin-bottom:9px}.catalog-progress strong{color:#255d50;font-size:13px;font-weight:650}.catalog-progress strong span{font-weight:400;color:#526870;font-size:12px}.catalog-progress progress{width:100%;height:5px}.catalog-entry{flex-shrink:0;font-size:13px;font-weight:600;background:#edf5f1;border-radius:6px;padding:9px 13px;white-space:nowrap}.catalog-entry:hover{background:#dfede6;text-decoration:none}.catalog-entry span{margin-left:6px}.catalog-empty{grid-column:1/-1;background:white;border:1px solid var(--line);border-radius:10px;text-align:center;padding:36px 20px;color:var(--muted);font-size:14px}.course-catalog a:focus-visible{outline:2px solid var(--accent);outline-offset:4px}@media(max-width:760px){.catalog-search.search{grid-template-columns:minmax(0,1fr) auto;padding:15px;gap:12px}.catalog-search.search label:first-child{grid-column:1/-1}.catalog-search.search button{margin:0}.catalog-grid{grid-template-columns:1fr;gap:14px}.catalog-card{padding:20px}.catalog-card h2{font-size:20px}.catalog-description{margin-bottom:18px}.catalog-card-bottom{gap:18px}}@media(prefers-reduced-motion:reduce){.catalog-card{transition:none}}

.delete-link{color:#a33d32;font-size:13px;margin-left:20px;white-space:nowrap}.danger{background:#a33d32}.danger:hover{background:#872e25}.deletion-panel{max-width:720px}.deletion-panel h2{margin-top:0}.deleted-courses{margin:24px 0}.deleted-courses .row{padding:15px 0}.deleted-courses form{margin:0}

/* Editable layered diagrams in lesson content */
.course-layers{border:1px solid #dce5e8;border-radius:14px;padding:20px;background:#fff;margin:28px 0;break-inside:avoid}.course-layers>figcaption{font-size:15px;font-weight:600;color:#425c67;margin:0 0 18px;text-align:center}.course-layer{text-align:center;border-radius:10px;padding:20px 18px;overflow-wrap:anywhere;line-height:1.65}.course-layer strong{display:block;font-size:19px;font-weight:700;color:#203541}.course-layer p,.lesson-paper article .course-layer p{font-size:15px;color:#4e626c;line-height:1.8;margin:7px 0 0;white-space:pre-line}.tone-blue{background:#e9f1fa}.tone-purple{background:#efedf8}.tone-teal{background:#e9f4ef}.tone-gray{background:#f0f3f5}.layer-arrow{color:#657983;text-align:center;font-size:23px;line-height:1.8;padding:2px 0}.diagram-error{color:#a33d32;font-size:14px}.diagram-help{margin:12px 0 22px}.diagram-help summary{font-size:14px}.diagram-help pre{white-space:pre-wrap;overflow-wrap:anywhere}@media(max-width:560px){.course-layers{padding:12px;border-radius:10px}.course-layer{padding:17px 12px}.course-layer strong{font-size:17px}.course-layer p,.lesson-paper article .course-layer p{font-size:14px}.layer-arrow{font-size:20px}}