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#comments-panel{position:fixed;top:76px;right:12px;bottom:12px;width:330px;z-index:24;background:#f6f7f9;border:1px solid #d6dce4;border-radius:8px;box-shadow:0 5px 20px #00274c14;padding:16px;overflow:auto;font-size:14px;line-height:1.45;color:#263442}
#comments-panel[hidden]{display:none}.comments-heading{display:flex;align-items:center;justify-content:space-between}.comments-heading h2{font-size:19px;border:0;margin:0;padding:0}#comments-panel button{font:inherit;cursor:pointer;padding:6px 10px;background:white;color:#00274c;border:1px solid #bdc6d0;border-radius:4px}#comments-panel button:disabled{opacity:.5}.comments-close{font-size:22px!important;border:0!important;padding:0 6px!important;background:none!important}
.comment-step-label{display:flex;gap:8px;align-items:center;margin-top:12px}#comments-panel select{font:inherit;padding:5px;border:1px solid #bac4cf;border-radius:4px;background:white}.comments-public{font-size:12px;color:#59646f;margin:10px 0}.comments-tools{display:flex;justify-content:space-between;gap:6px;margin:12px 0}.comments-tools button{font-size:12px!important}.comment-card{padding:12px;background:white;border:1px solid #dce1e7;border-radius:6px;margin:10px 0;overflow-wrap:anywhere}.comment-card time{display:block;color:#68717a;font-size:11px;margin-top:3px}.comment-card p{white-space:pre-wrap;margin:9px 0}.comment-card a{display:block;color:#005b8c;margin-top:8px;font-size:12px}.comment-card .comment-delete{font-size:12px!important;color:#8b3030!important;margin-top:10px}.comment-image{margin:7px 0;border:0;background:transparent}.comment-image summary{display:list-item!important;padding:0;color:#005b8c;font-size:13px;background:none!important;border:0!important;cursor:pointer}.comment-image img{display:block;max-width:100%;height:auto;margin-top:9px}.comment-form{border-top:1px solid #cdd5df;padding-top:12px;margin-top:16px}.comment-form label{display:block;margin:8px 0;font-size:13px}.comment-form input:not([type=file]),.comment-form textarea{display:block;width:100%;font:inherit;padding:7px;border:1px solid #b9c4cf;border-radius:4px;margin-top:4px;background:white}.comment-form input[type=file]{display:block;max-width:100%;font-size:12px;margin-top:5px}.comment-form small{display:block;font-size:11px;color:#626c76;margin-bottom:10px}.comment-form button[type=submit]{background:#00274c!important;color:white!important}.comment-form .comment-honey{display:none}.comments-status{font-size:12px;color:#425466}.comments-empty{color:#66717c;font-size:13px}
@media(min-width:1100px){body.comments-open .course-layout{max-width:none;margin-right:354px;grid-template-columns:210px minmax(0,900px);gap:18px}body.comments-open .course-layout>main{padding-left:24px;padding-right:24px}}
@media(max-width:1099px){#comments-panel{width:min(360px,calc(100vw - 24px));box-shadow:0 8px 30px #00274c44}}
@media(max-width:650px){#comments-panel{top:140px}.course-header .site-actions{gap:5px}.course-header .site-actions button{padding:6px 8px;font-size:12px}}
@media print{#comments-panel{display:none!important}}
#lesson .study-pager{flex-wrap:wrap;gap:10px}#lesson .study-position{margin-right:auto;font-size:.85rem;color:#56616b}#lesson .dataset-download{display:inline-block;padding:9px 14px;border:1px solid #00274c;border-radius:5px;background:#00274c;color:white;font-weight:600;text-decoration:none}#lesson .dataset-download:hover{background:#17466d}
@media(max-width:600px){#lesson .study-position{width:100%;order:-1;text-align:center}#lesson .study-pager{justify-content:space-between}}

/* Compact problem-set utilities at the foot of the step sidebar. */
.step-sidebar{display:flex;flex-direction:column;height:calc(100vh - 90px);overflow:hidden}
.step-sidebar>details{flex:1;min-height:0;overflow:auto}
.sidebar-tools{flex:0 0 auto;display:grid!important;grid-template-columns:1fr 1fr;gap:5px!important;margin:8px 0 0!important;padding:10px 8px 0!important;border-top:1px solid #c8d2dc}
.sidebar-tools button{min-width:0;padding:7px 5px!important;border:1px solid #b7c3ce!important;background:#fff!important;color:#29445d!important;border-radius:3px!important;font-size:11px!important;font-weight:700!important;line-height:1.15!important;box-shadow:none!important}
.sidebar-tools #comments-toggle{grid-column:1/-1}
.sidebar-tools #editor-open{grid-column:1/-1}
.sidebar-tools button:hover{background:#eaf2fa!important;border-color:#5e7890!important}
.intro-format-key{display:flex;justify-content:flex-end;margin:-34px 0 12px}.intro-format-key button{padding:7px 11px;border:1px solid #9dafbf;border-radius:4px;background:#fff;color:#00274c;font:inherit;font-size:.8rem;font-weight:700;cursor:pointer}.intro-format-key button:hover{background:#eaf2fa;border-color:#56728c}
.home-about{display:grid;grid-template-columns:minmax(0,.9fr) minmax(320px,1.1fr);gap:34px;margin:48px 0 12px;padding-top:22px;border-top:1px solid #bcc8d2;color:#52677a;font-size:.9rem;line-height:1.45}
.home-about strong{color:#00274c}
.home-about p{margin:5px 0 0;max-width:720px}.home-about a{color:#005b9a;font-weight:650}.site-feedback label{display:block;color:#00274c;font-weight:750}.site-feedback textarea{display:block;width:100%;margin-top:6px;padding:10px 12px;resize:vertical;border:1px solid #aebdca;border-radius:4px;background:#fff;color:#172d40;font:inherit;line-height:1.4}.site-feedback textarea:focus{outline:3px solid #8cc4ee;outline-offset:1px;border-color:#005cb9}.feedback-honey{display:none!important}.feedback-submit{display:flex;align-items:center;gap:12px;margin-top:9px}.feedback-submit button{padding:8px 13px;border:0;border-radius:4px;background:#00274c;color:#fff;font:inherit;font-weight:750;cursor:pointer}.feedback-submit button:disabled{opacity:.6;cursor:wait}#feedback-status{font-size:.8rem;line-height:1.3}
@media(max-width:900px){.step-sidebar{position:sticky;top:108px;z-index:20;display:flex;flex-direction:row;align-items:center;gap:8px;height:auto;max-height:none;overflow:visible;padding:6px 8px;background:#f6f7f8;border-top:1px solid #c7d1dc;border-bottom:1px solid #c7d1dc}.step-sidebar>details{position:relative;flex:1;min-width:0;overflow:visible}.step-sidebar summary{width:fit-content;padding:7px 10px;font-size:.9rem;line-height:1.2;white-space:nowrap}.step-sidebar nav{position:absolute;top:calc(100% + 6px);left:0;width:min(460px,calc(100vw - 16px));max-height:50vh;overflow:auto;padding:8px;background:#fff;border:1px solid #bcc8d2;box-shadow:0 10px 28px #001b3540}.sidebar-tools{flex:0 0 auto;display:flex!important;margin:0!important;padding:0!important;border:0!important}.sidebar-tools button{width:auto!important;padding:7px 10px!important;white-space:nowrap}#lesson{margin-top:24px}.intro-format-key{margin:-30px 0 10px}}
@media(max-width:700px){.home-about{grid-template-columns:1fr;gap:20px}}

/* Minimal course landing page. */
.resource-home>.resource-section:first-child{margin-top:0}
.resource-home .exam-card{display:block}
.resource-home .problem-card h3{margin-top:0}
.resource-home .problem-card p{margin:6px 0 0}

/* Familiar PS6 steps retain a subtle blue highlight from the handout. */
#lesson[data-page="ps6"] mark.cyan,#lesson[data-page="ps6"] mark.blue{background:#edf4fa;padding:.07em .1em;box-decoration-break:clone;-webkit-box-decoration-break:clone}

.step-mode-toggle{display:inline-flex;gap:0;border:1px solid #bdc8d3;border-radius:6px;overflow:hidden}.study-pager .step-mode-toggle button{border:0;border-radius:0;margin:0;background:white;color:#33465b}.study-pager .step-mode-toggle button[aria-pressed="true"]{background:#e5eef7;color:#00274c;box-shadow:inset 0 -2px #406a94}