:root{--navy:#122535;--navy-2:#19384d;--blue:#1674b8;--blue-2:#0d8acb;--green:#10946d;--bg:#f3f6f8;--surface:#fff;--text:#1c2a34;--muted:#6c7c87;--border:#dce5ea;--danger:#c83c4b;--amber:#d79420;--shadow:0 10px 28px rgba(23,43,57,.09);font-family:"Segoe UI",Tahoma,Arial,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}.app-shell{display:flex;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:260px;background:var(--navy);color:#e9f1f6;display:flex;flex-direction:column;z-index:40;direction:ltr}.brand{display:flex;align-items:center;gap:12px;padding:25px 22px;border-bottom:1px solid rgba(255,255,255,.1)}.brand img{width:142px;height:38px;object-fit:contain;object-position:left}.brand span{display:none}.main-nav{padding:18px 10px;display:grid;gap:3px;direction:rtl}.main-nav a{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:7px;color:#bdcbd5;font-size:14px}.main-nav a span{display:grid;place-items:center;width:24px;font-size:19px;color:#83a2b7}.main-nav a:hover,.main-nav a.active{background:rgba(255,255,255,.09);color:#fff}.main-nav a.active{border-left:3px solid #36a6e8}.sidebar-user{margin-top:auto;padding:18px 22px;border-top:1px solid rgba(255,255,255,.1);direction:rtl}.sidebar-user strong,.sidebar-user small{display:block;overflow:hidden;text-overflow:ellipsis}.sidebar-user small{color:#91a6b5;margin:4px 0 10px}.link-button{border:0;background:none;padding:0;color:#75bee8;cursor:pointer}.workspace{margin-left:260px;width:calc(100% - 260px);min-height:100vh}.topbar{height:68px;position:sticky;top:0;z-index:30;background:#137ab4;color:#fff;display:flex;align-items:center;gap:20px;padding:0 30px;box-shadow:0 2px 8px rgba(13,55,80,.18)}.page-title{font-weight:700;white-space:nowrap}.menu-toggle{display:none;border:0;background:transparent;color:#fff;font-size:25px}.global-search{margin-right:auto;width:min(440px,50vw);display:flex;background:rgba(255,255,255,.16);border-radius:7px;overflow:hidden}.global-search input{flex:1;background:transparent;border:0;color:#fff;padding:10px 14px;outline:0}.global-search input::placeholder{color:#dbeef8}.global-search button{border:0;background:transparent;color:#fff;width:46px;font-size:22px}.main-content{padding:30px;max-width:1500px;margin:auto}.alert{padding:13px 16px;border-radius:8px;margin:0 0 18px}.alert-error{background:#fde9eb;color:#9d2532;border:1px solid #f4c5ca}.alert-success{background:#e4f7ef;color:#176d50;border:1px solid #bee9da}.hero-card{background:linear-gradient(120deg,#1269a7,#1389c5);color:#fff;border-radius:14px;padding:35px 40px;display:flex;align-items:center;justify-content:space-between;box-shadow:var(--shadow);overflow:hidden;position:relative}.hero-card:after{content:"";position:absolute;width:280px;height:280px;border:55px solid rgba(255,255,255,.07);border-radius:50%;left:-70px;top:-100px}.hero-card.green{background:linear-gradient(120deg,#087b58,#17a57a)}.hero-card h1,.result-hero h1{font-size:32px;margin:7px 0}.hero-card p{margin:0;color:#dff3ff}.eyebrow{text-transform:uppercase;letter-spacing:1.4px;font-size:12px;font-weight:800}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid transparent;border-radius:7px;padding:10px 18px;font-weight:700;cursor:pointer}.button-primary{background:var(--blue);color:#fff}.button-secondary{background:#fff;color:var(--blue);border-color:#b9d5e5}.button-light{background:#fff;color:#126a9b;z-index:1}.button-block{width:100%}.metric-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin:22px 0}.metric-grid.two{grid-template-columns:repeat(2,1fr);max-width:700px}.metric-grid article{background:#fff;border:1px solid var(--border);border-radius:10px;padding:20px;box-shadow:0 4px 16px rgba(24,43,55,.04)}.metric-grid strong{display:block;font-size:28px;color:var(--blue)}.metric-grid span{font-size:13px;color:var(--muted)}.section-block{margin-top:30px}.section-heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}.section-heading h2{margin:0}.section-heading a{color:var(--blue);font-weight:700}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}.subject-grid.large{grid-template-columns:repeat(2,minmax(0,1fr))}.subject-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:17px;display:flex;gap:14px;align-items:center;transition:.2s}.subject-card:hover,.content-card:hover{transform:translateY(-2px);box-shadow:var(--shadow);border-color:#b5d7e9}.subject-card h2,.subject-card h3{margin:0 0 4px;font-size:16px}.subject-card p{margin:0;color:var(--muted);font-size:13px}.subject-card b{margin-right:auto;color:var(--blue);font-size:22px}.subject-icon{width:44px;height:44px;border-radius:10px;background:#e4f3fb;color:#1475a9;display:grid;place-items:center;font-weight:800;font-size:12px;flex:0 0 auto}.large-icon{width:60px;height:60px;font-size:15px}.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.content-card{background:#fff;padding:17px;border:1px solid var(--border);border-radius:10px}.content-card small{color:var(--blue);font-weight:800}.content-card h3{margin:7px 0 12px;font-size:15px}.content-card>span{display:block;text-align:left;color:var(--muted);font-size:12px}.progress{height:7px;border-radius:9px;background:#e5edf1;overflow:hidden}.progress i{display:block;height:100%;background:var(--green);border-radius:inherit}.progress.amber i{background:var(--amber)}.page-intro{display:flex;align-items:center;gap:18px;margin:0 0 24px}.page-intro h1{margin:0 0 5px;font-size:28px}.page-intro p{margin:0;color:var(--muted)}.breadcrumbs{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:13px;margin-bottom:16px}.breadcrumbs a{color:var(--blue)}.topic-list,.question-list{display:grid;gap:7px}.topic-list a,.question-list a{display:flex;align-items:center;gap:15px;padding:14px 18px;border:1px solid var(--border);border-radius:8px;background:#fff}.topic-list a:hover,.question-list a:hover{border-color:#a9d1e6}.topic-list a>span{width:34px;color:var(--blue);font-weight:800}.topic-list a>b,.question-list a>b{margin-right:auto;color:var(--blue)}.topic-list.grouped a small{color:var(--muted);margin-right:auto}.filter-bar{display:flex;align-items:end;gap:16px;background:#fff;border:1px solid var(--border);padding:14px 18px;border-radius:9px;margin-bottom:18px}.filter-bar label{display:grid;gap:5px;font-size:12px;font-weight:700}.filter-bar select,.stack-form input,.stack-form select,.stack-form textarea,.search-page-form input,.search-page-form select{border:1px solid #cddae2;border-radius:7px;background:#fff;padding:10px 12px;min-width:220px;outline:0}.filter-bar span{color:var(--muted);margin-inline-start:auto}.reader-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:18px;direction:ltr}.reader-card,.reader-side section,.panel,.question-card{background:#fff;border:1px solid var(--border);border-radius:10px;box-shadow:0 4px 18px rgba(30,51,63,.04)}.reader-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;padding:24px 30px;border-bottom:1px solid var(--border);direction:ltr}.reader-header h1{margin:4px 0 0;font-size:26px}.reader-header small{color:var(--green);font-weight:800;text-transform:uppercase}.reader-tools{display:flex;gap:8px;flex-wrap:wrap}.icon-button{width:42px;height:42px;border-radius:7px;border:1px solid #bed6e3;background:#fff;color:#91a1aa;font-size:22px}.icon-button.active{color:#f5b21d;background:#fff8e0}.reader-side{display:grid;align-content:start;gap:14px;direction:rtl}.reader-side section{padding:17px}.reader-side h3{margin:0 0 12px}.note-form textarea{width:100%;border:1px solid var(--border);border-radius:7px;padding:10px;margin-bottom:8px}.note-list p{background:#f5f8fa;padding:10px;border-radius:7px;font-size:13px}.note-list small{display:block;color:var(--muted);margin-top:6px}.highlight-list blockquote{margin:8px 0;padding:10px;border-right:4px solid #f2c94c;background:#fff9ce;font-size:13px}.highlight-list blockquote.green{border-color:#58b892;background:#e7f8ef}.highlight-list blockquote.blue{border-color:#53a6d6;background:#e8f5fb}.highlight-list blockquote.pink{border-color:#d884aa;background:#fbeaf2}.content-document{padding:28px 38px;font-family:Georgia,"Times New 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h2{font-family:"Segoe UI",sans-serif;color:#173f59}.flashcard-stage{display:flex;align-items:center;justify-content:center;gap:25px;perspective:1200px;min-height:460px}.flashcard{width:min(720px,75vw);height:390px;cursor:pointer}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .55s;transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flash-front,.flash-back{position:absolute;inset:0;backface-visibility:hidden;background:#fff;border-radius:16px;box-shadow:var(--shadow);border:1px solid var(--border);padding:45px;display:grid;place-items:center;text-align:center;align-content:center;gap:20px}.flash-back{transform:rotateY(180deg);background:linear-gradient(145deg,#0e789f,#0f9b76);color:#fff}.flash-front h2,.flash-back h2{font-family:Georgia,"Times New Roman",serif;font-size:26px;line-height:1.45}.flash-front span{color:var(--muted)}.flash-back 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calc(var(--score)*1%),rgba(255,255,255,.22) 0);display:grid;place-items:center;position:relative}.score-ring:after{content:"";position:absolute;inset:9px;background:#138c69;border-radius:50%}.score-ring strong{z-index:1;font-size:23px}.result-list{display:grid;gap:10px;margin-top:18px}.result-list article{display:flex;gap:15px;background:#fff;border:1px solid var(--border);border-left:5px solid var(--green);border-radius:8px;padding:15px}.result-list article.wrong{border-left-color:var(--danger)}.result-list article>span{font-weight:800;color:var(--muted)}.result-list h2{font-size:16px;margin:0 0 5px}.result-list p{margin:0 0 5px;color:var(--muted)}.result-list a{color:var(--blue)}.details{display:grid;grid-template-columns:150px 1fr;gap:12px;margin:0}.details dt{color:var(--muted)}.details dd{margin:0;font-weight:700}.plan-list{display:grid;gap:13px}.plan-card{background:#fff;border:1px solid var(--border);border-radius:10px;padding:18px;display:grid;grid-template-columns:1.2fr 1fr auto;align-items:center;gap:24px}.plan-title{display:flex;gap:13px;align-items:center}.plan-title h2{font-size:16px;margin:0}.plan-title p{font-size:13px;color:var(--muted);margin:5px 0 0}.plan-bars{display:grid;gap:10px}.plan-bars label{display:grid;grid-template-columns:1fr auto;gap:6px;font-size:12px}.plan-bars .progress{grid-column:1/-1}.plan-actions{display:grid;gap:8px}.plan-actions a{color:var(--blue);font-size:13px;font-weight:700}.empty-state{background:#fff;border:1px dashed #b9cad4;border-radius:10px;text-align:center;padding:40px;margin-top:20px}.empty-state h2{margin-top:0}.empty-state p,.muted{color:var(--muted)}.modal[hidden]{display:none}.modal{position:fixed;inset:0;z-index:100;display:grid;place-items:center}.modal-backdrop{position:absolute;inset:0;background:rgba(5,19,28,.72)}.modal-panel{position:relative;width:min(1000px,92vw);max-height:88vh;overflow:auto;background:#fff;border-radius:12px;padding:20px;z-index:1;direction:ltr}.modal-panel h2{padding:0 20px}.modal-close{position:absolute;top:10px;right:12px;width:38px;height:38px;border:0;background:#edf3f6;border-radius:50%;font-size:25px}.resource-image{display:block;max-width:100%;height:auto;margin:auto}.modal-open{overflow:hidden}.login-page{min-height:100vh;display:grid;place-items:center;background:linear-gradient(135deg,#102735,#1b6c91)}.login-card{width:min(430px,92vw);background:#fff;padding:35px;border-radius:14px;box-shadow:0 24px 60px rgba(0,0,0,.24)}.login-card h1{margin:25px 0 7px}.login-card>p{color:var(--muted);margin:0 0 22px}.login-brand{background:var(--navy);margin:-35px -35px 0;padding:24px 35px;border-radius:14px 14px 0 0;color:#bcd0dc;display:flex;align-items:center;gap:15px}.login-brand img{width:160px}.login-brand span{font-size:12px}.loading{text-align:center;color:var(--muted)}
@media(max-width:1100px){.metric-grid{grid-template-columns:repeat(3,1fr)}.subject-grid{grid-template-columns:repeat(2,1fr)}.reader-layout{grid-template-columns:1fr}.reader-side{grid-template-columns:repeat(2,1fr)}.plan-card{grid-template-columns:1fr 1fr}.plan-actions{grid-column:1/-1;display:flex}}
@media(max-width:820px){.sidebar{transform:translateX(-100%);transition:.25s}.sidebar-open .sidebar{transform:translateX(0)}.sidebar-open:after{content:"";position:fixed;inset:0;background:rgba(0,0,0,.45);z-index:35}.workspace{margin-left:0;width:100%}.menu-toggle{display:block}.topbar{padding:0 15px}.global-search{width:auto;flex:1}.page-title{display:none}.main-content{padding:18px}.subject-grid,.subject-grid.large,.two-column,.card-grid{grid-template-columns:1fr}.hero-card,.result-hero{align-items:flex-start;flex-direction:column}.metric-grid{grid-template-columns:repeat(2,1fr)}.reader-header{flex-direction:column}.reader-side{grid-template-columns:1fr}.content-document{padding:22px 18px;font-size:16px}.plan-card{grid-template-columns:1fr}.search-page-form,.filter-bar{align-items:stretch;flex-direction:column}.filter-bar span{margin:0}.flashcard{width:76vw;height:420px}.flashcard-stage{gap:8px}.flash-nav{width:38px;height:38px}.modal-panel{width:96vw}.details{grid-template-columns:1fr}.details dd{margin-bottom:8px}}

/* Captured MKSAP20 section outline. */
.drawer-toc .toc-section, .board-section-list .toc-section {display:block;padding:7px 12px 7px 24px;font-size:.9rem;font-weight:400;}
.toc-section[data-depth="1"] {padding-left:36px!important;}
.toc-section[data-depth="2"], .toc-section[data-depth="3"] {padding-left:48px!important;}
.board-section-list {margin:0 16px 14px;}
.board-section-list summary {cursor:pointer;padding:8px 0;}