:root{--ink:#202a31;--ink-soft:#5e686e;--ink-faint:#7b858a;--stone:#f7f7f4;--paper:#fff;--line:#e4e7e6;--copper:#b65f3b;--copper-wash:#fbf1eb;--focus:#337a9b;--mountain:#334c52;--radius:8px;--space:4px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Avenir Next",Avenir,"Segoe UI",Arial,sans-serif;font-size:14px;line-height:1.6;-webkit-font-smoothing:antialiased}button,input,textarea,select{font:inherit}button,a,input,textarea{touch-action:manipulation}button{cursor:pointer;color:inherit}button,a{transition:background-color .15s,color .15s}button:active{transform:translateY(1px)}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid 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.course-hero.custom-course{grid-template-columns:1fr}.custom-course .hero-copy>p{max-width:700px}.custom-course h1{max-width:900px}.source-chain:has(.source-node:nth-of-type(7)){overflow-x:auto;justify-content:flex-start}.source-chain .source-node{flex-shrink:0}

/* Course reading rhythm: limestone canvas, white sources, copper thread. */
:root{--ink:#26312e;--ink-soft:#59635e;--ink-faint:#68716b;--stone:#f3f3ed;--paper:#fff;--line:rgba(46,59,49,.13);--copper:#a84e2d;--copper-wash:#fbf1e9;--mountain:#37594d;--card-shadow:0 3px 12px rgba(40,48,35,.035)}
body{background:#fafaf7;font-size:15px}.topbar{background:var(--paper)}
.hero-copy>p{font-size:16px;line-height:1.75}.hero-meta{font-size:13px}.hero-note{font-size:12px}.course-label,.strip-label{font-size:10px}.hero-photo>img{border-radius:12px}.hero-photo figcaption{font-size:10px}.button{font-size:14px;border-radius:8px;min-height:48px}.hero-actions{gap:12px}.breadcrumb{font-size:12px}.breadcrumb button{min-height:44px}
.source-strip{padding:20px 0;margin-top:36px}.source-node{font-size:12px;padding:8px;min-height:48px}.source-node small{font-size:11px;color:var(--ink-soft)}.source-node:hover{background:#eaece5}.course-tabs>button{font-size:14px}.course-tabs button span{font-size:11px}.course-tabs>button[aria-selected=true]{border-color:var(--copper)}.tabs-note{font-size:12px}.course-tabs{margin-bottom:32px}
h2{font-size:24px}.path-heading p{font-size:13px;line-height:1.6;max-width:430px}.text-button{font-size:13px;min-height:44px}.course-layout{gap:36px;grid-template-columns:minmax(0,1fr) 280px}.step{grid-template-columns:40px minmax(0,1fr);column-gap:12px}.step-number{width:40px;height:44px;font-size:12px;margin-top:12px;border-radius:22px;background:var(--paper);transition:background .15s,color .15s}.step:not(:last-child):before{left:19px;top:58px;background:var(--line)}.step:first-child .step-number{background:var(--paper);color:var(--ink-soft);border-color:var(--line)}.step.up-next .step-number{background:var(--copper);color:white;border-color:var(--copper)}.step.done .step-number{background:var(--mountain);color:white;border-color:var(--mountain)}.step-number:hover{box-shadow:0 0 0 4px var(--copper-wash)}
.resource-card{border-radius:12px;box-shadow:var(--card-shadow)}.step.up-next .resource-card{border-color:#d5b29e}.next-label{display:flex;justify-content:space-between;gap:12px;background:var(--copper-wash);color:var(--copper);font-size:10px;font-weight:650;letter-spacing:.8px;padding:12px 24px}.next-label span{font-weight:500;letter-spacing:0;font-size:11px}.resource-top{padding:20px 24px 0}.provider{font-size:12px}.media-tag{font-size:11px}.resource-main{padding:16px 24px 20px;gap:20px}.resource-main h3{font-size:21px;line-height:1.35;letter-spacing:-.4px}.resource-main p{font-size:14px;line-height:1.75;margin-bottom:12px}.resource-main .selection{font-size:12px;color:var(--ink-faint)}.resource-preview{width:128px;height:88px;border-radius:6px}.resource-illustration{background:var(--stone);color:#6c7c70;border-radius:8px}.resource-bottom{padding:12px 24px;background:#f8f9f5;border-color:var(--line)}.resource-bottom .duration{font-size:12px;line-height:1.5}.duration small{display:block;font-size:11px;color:var(--ink-faint);margin-top:4px}.resource-open{font-size:13px;min-height:44px;white-space:nowrap;gap:8px}.bridge{font-size:12px;padding:16px 0;line-height:1.6}.bridge .icon{flex-shrink:0;color:var(--copper)}.add-resource{width:calc(100% - 52px);margin-left:52px;padding:20px 24px;border-radius:10px}.add-resource strong{font-size:14px}.add-resource small{font-size:12px}.edit-controls button{min-height:44px;font-size:12px}.outline-card{background:transparent;padding:24px;border-radius:12px}.eyebrow{font-size:10px}.progress-heading{font-size:13px}.progress-heading>span{font-size:12px}progress{height:6px;margin:12px 0 20px}.resume-card{width:100%;text-align:left;background:var(--copper-wash);border-radius:8px;padding:16px;margin-bottom:16px;display:grid;gap:8px}.resume-card .eyebrow{margin:0;color:var(--copper);font-size:9px}.resume-card strong{font-size:14px;line-height:1.5;font-weight:600}.resume-card>span:last-child{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:var(--ink-soft)}.resume-card:hover{background:#f4e5d8}.outline-item{padding:12px 0}.outline-item strong{font-size:13px}.outline-item small{font-size:11px}.outline-item>.icon{flex-shrink:0}.outline-bottom p{font-size:12px}.certificate-callout p:not(.eyebrow){font-size:14px;line-height:1.7}.certificate-callout small,.local-note{font-size:11px}.certificate-callout .text-button{font-size:13px}.certificate-callout .eyebrow{font-size:10px}
textarea,input[type=text],input[type=url],select{font-size:16px;background:var(--stone);border-color:var(--line);border-radius:8px;line-height:1.6}label{font-size:14px}#notes-status{font-size:12px}.icon-button{width:44px;height:44px}.tiny{font-size:12px!important}dialog{border-radius:16px;padding:32px;box-shadow:0 24px 80px #17251e30}dialog p{font-size:15px;line-height:1.75}.resource-details{font-size:13px;padding:20px}.dialog-pager button{min-height:44px;font-size:13px}body:has(dialog[open]){overflow:hidden}footer p,footer>a:not(.brand),footer .text-button{font-size:12px}:focus-visible{outline:3px solid var(--focus);outline-offset:4px}.resource-card:target{outline:2px solid var(--copper)}
@media(max-width:1050px){.course-layout{grid-template-columns:minmax(0,1fr) 248px;gap:24px}.outline-card{padding:16px}.source-strip{gap:16px}.source-node{font-size:11px;padding:6px}.resource-preview{width:90px;height:72px}}
@media(max-width:800px){.course-layout{grid-template-columns:1fr}.hero-meta{font-size:12px}.hero-copy>p{font-size:15px}.source-node small{display:block}.source-node .mit-wordmark{width:52px}.source-node .librivox-wordmark{width:52px}.source-chain{gap:0}.hero-actions .button{font-size:13px}.hero-note{font-size:11px}.topbar nav{gap:16px}}
@media(max-width:560px){.topbar{height:auto;min-height:72px;gap:12px;flex-wrap:wrap;padding:12px 18px}.topbar nav{gap:12px}.topbar nav button:last-child{display:block}.header-export{display:none}.topbar button{font-size:12px}.hero-copy>p{font-size:15px}.hero-meta{font-size:12px;gap:16px}.hero-actions .button{padding:12px 16px;font-size:13px}.hero-note{font-size:11px}.hero-photo>img{height:232px}.source-node{min-height:56px;gap:8px;font-size:12px}.source-node .mit-wordmark{width:74px}.source-node .librivox-wordmark{width:70px}.course-tabs{gap:20px;position:sticky;top:0;z-index:3;background:#fafaf7;margin-bottom:24px}.course-tabs>button{font-size:12px;min-height:56px}.course-tabs button span{font-size:10px}.path-heading{flex-wrap:wrap;gap:8px}.path-heading h2{font-size:24px}.path-heading p{font-size:13px;max-width:100%}.path-heading .text-button{font-size:13px;padding:0;min-width:0}.step{grid-template-columns:32px minmax(0,1fr);gap:8px}.step-number{width:32px;height:44px;font-size:11px}.step:not(:last-child):before{left:15px}.next-label{padding:12px 16px;font-size:9px;gap:8px}.next-label span{font-size:10px}.resource-top{padding:16px 16px 0;gap:8px;flex-wrap:wrap}.provider{font-size:12px}.media-tag{font-size:10px}.resource-main{padding:16px}.resource-main h3{font-size:20px}.resource-main p{font-size:14px}.resource-main .selection{font-size:12px}.resource-preview{height:150px;width:100%}.resource-bottom{padding:12px 16px;gap:8px;display:block}.resource-bottom .duration{font-size:12px}.resource-open{font-size:13px;width:100%;justify-content:space-between;margin-top:8px}.bridge{font-size:12px;padding:16px 0}.add-resource{margin-left:40px;width:calc(100% - 40px);padding:16px;gap:12px}.add-resource strong{font-size:13px}.add-resource small{font-size:12px}.edit-controls{flex-wrap:wrap}.edit-controls button{font-size:11px;padding:8px}.outline-card{padding:24px}.outline-item strong{font-size:14px}.hero-photo figcaption{font-size:9px}.dialog-actions .button{font-size:13px;flex:1 1 100%}dialog{padding:20px}.dialog-pager{gap:8px}.dialog-pager button{font-size:12px}#notes-status{display:block;margin:12px 0}}
@media(max-width:560px){.header-export{display:block;flex-basis:100%;text-align:right;min-height:32px!important;padding:0!important;font-size:11px!important}}