@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;550;600;650;700&family=Manrope:wght@500;600;700;750;800&display=swap');
:root{color-scheme:light;--bg:#f9f9f9;--surface:#fff;--ink:#0f0f0f;--muted:#606060;--line:#e5e5e5;--subtle:#f2f2f2;--green:#22634e;--green-hover:#164c3a;--green-soft:#e8f2ec;--shadow:0 1px 2px #00000008;--side:240px;--radius:12px;--player:#0f0f0f;font-family:'DM Sans',system-ui,sans-serif;font-size:14px}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);line-height:1.55}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer;color:inherit}button:disabled{cursor:not-allowed;opacity:.45}a{color:inherit;text-decoration:none}svg{flex-shrink:0;vertical-align:middle}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #66ae8f;outline-offset:4px}button,input,select{border-radius:8px}h1,h2,h3,h4,p{margin:0}h1,h2,h3,h4{font-family:Manrope,system-ui,sans-serif}h1{font-size:32px;line-height:1.25;letter-spacing:-1.1px;font-weight:800}h2{font-size:19px;letter-spacing:-.6px;font-weight:800}h3{font-size:16px;letter-spacing:-.3px}p{color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-80px;left:20px;z-index:300;background:var(--green);color:#fff;padding:12px 18px}.skip-link:focus{top:10px}[hidden]{display:none!important}
.sidebar{width:var(--side);height:100dvh;position:fixed;inset:0 auto 0 0;background:var(--surface);border-right:1px solid var(--line);z-index:40;display:flex;flex-direction:column;padding:30px 18px 18px;transition:width .18s ease}.brand{display:flex;align-items:center;gap:10px;padding:0 13px 34px;white-space:nowrap;font:800 24px Manrope;letter-spacing:-1px}.brand-mark{display:grid;place-items:center;background:#24664d;border-radius:11px;width:35px;height:38px;flex-shrink:0}.brand-mark img{width:24px;height:27px;object-fit:contain}.sidebar-label{font-size:10px;font-weight:700;color:#929b98;letter-spacing:1.5px;margin:9px 15px 13px}.side-nav{display:flex;flex-direction:column;gap:5px}.nav-link{display:flex;align-items:center;gap:12px;min-height:44px;padding:10px 14px;border-radius:9px;color:#738079;font-size:13px;font-weight:550;white-space:nowrap;transition:background .15s,color .15s}.nav-link:hover{background:var(--subtle);color:var(--ink)}.nav-link.active{color:var(--green);background:var(--green-soft);font-weight:700}.nav-link.active:after{content:'';width:5px;height:5px;border-radius:50%;background:var(--green);margin-left:auto}.side-divider{border:0;border-top:1px solid var(--line);margin:21px 13px}.side-spacer{flex:1;min-height:25px}.sidebar-note{background:#f6f8f4;border:1px solid #e8ece2;border-radius:12px;padding:15px;margin:0 5px 20px}.sidebar-note p{font-size:11px;line-height:1.8;margin:7px 0 0;color:#7a8475}.sidebar-note b{font-size:12px;font-weight:650}.sidebar-footer{display:flex;align-items:center;gap:10px;border-top:1px solid var(--line);padding:19px 10px 0}.avatar{width:35px;height:35px;border-radius:50%;background:#f0e9de;color:#88714e;display:grid;place-items:center;font-size:12px;font-weight:700;flex-shrink:0}.profile-text{min-width:0;flex:1}.profile-text b{font-size:12px;display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.profile-text span{font-size:10px;color:var(--muted)}.icon-button{width:36px;height:36px;border:1px solid var(--line);background:var(--surface);display:inline-grid;place-items:center;border-radius:9px;flex-shrink:0;transition:background .15s}.icon-button:hover{background:var(--subtle)}.icon-button.bare{border:0;background:transparent}.workspace{margin-left:var(--side);min-width:0;transition:margin-left .18s ease}.topbar{height:77px;padding:0 38px;display:flex;align-items:center;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);background:var(--bg);position:sticky;top:0;z-index:25}.topbar-left,.topbar-right{display:flex;align-items:center;gap:14px}.breadcrumb{font-size:12px;color:var(--muted);display:flex;align-items:center;gap:10px}.breadcrumb b{font-weight:550;color:var(--ink)}.search-trigger{display:flex;align-items:center;gap:9px;background:var(--surface);border:1px solid var(--line);padding:9px 11px;color:#8b9490;font-size:11px;width:228px;text-align:left}.search-trigger kbd{font:10px system-ui;border:1px solid var(--line);padding:0 4px;border-radius:3px;margin-left:auto}.topbar-separator{height:25px;width:1px;background:var(--line)}.workspace-label{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:6px}.status-dot{width:6px;height:6px;border-radius:50%;background:#76a48b}.content{max-width:1440px;margin:auto;padding:34px 38px 70px}.page-heading{display:flex;justify-content:space-between;align-items:center;gap:24px;margin-bottom:26px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:1.7px;text-transform:uppercase;color:var(--green);margin-bottom:9px}.page-heading p{font-size:13px;margin-top:10px}.heading-extra{font-size:11px;color:var(--muted);display:flex;align-items:center;gap:8px;white-space:nowrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;background:var(--green);color:#fff;border:1px solid transparent;border-radius:8px;min-height:42px;padding:10px 16px;font-size:12px;font-weight:650;line-height:1.4;transition:background .15s,box-shadow .15s}.btn:hover{background:var(--green-hover);box-shadow:0 3px 10px #143d3210}.btn.secondary{background:var(--surface);border-color:var(--line);color:var(--ink)}.btn.secondary:hover{background:var(--subtle)}.btn.soft{background:var(--green-soft);color:var(--green)}.btn.light{background:#fff;color:#254b39}.btn.small{min-height:34px;padding:7px 12px;font-size:11px}.text-link{border:0;background:none;padding:4px 0;color:var(--green);display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:650}.text-link:hover{text-decoration:underline;text-underline-offset:4px}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:30px 0 16px}.section-heading p{font-size:12px;margin-top:4px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:23px}.grid{display:grid;gap:18px}.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}.row{display:flex;align-items:center;gap:12px}.between{justify-content:space-between}.muted{color:var(--muted)}.small{font-size:12px}.tag{font-size:10px;display:inline-flex;align-items:center;gap:5px;border-radius:5px;padding:4px 7px;background:var(--subtle);color:var(--muted);font-weight:550}.tag.green{background:var(--green-soft);color:var(--green)}
.dashboard-top{display:grid;grid-template-columns:minmax(0,1fr) 273px;gap:20px}.hero{background:#183e31;color:#fff;border-radius:17px;padding:31px 32px;min-height:260px;position:relative;overflow:hidden;isolation:isolate;display:flex;align-items:center}.hero-copy{z-index:2;position:relative;width:66%}.hero .eyebrow{color:#afc8b9;font-size:9px;letter-spacing:1.7px}.hero h2{font-size:33px;line-height:1.2;letter-spacing:-1px;font-weight:750;margin:13px 0}.hero h2 span{color:#cce6ad}.hero p{color:#b6c9be;max-width:310px;font-size:12px;line-height:1.8;margin-bottom:20px}.hero-art{position:absolute;inset:0 0 0 auto;width:38%;z-index:1;display:grid;place-items:center}.hero-ring{position:absolute;width:300px;height:300px;border-radius:50%;border:1px solid #ffffff12}.hero-ring:nth-child(2){width:225px;height:225px;border-color:#ffffff18}.hero-ring:nth-child(3){width:140px;height:140px;background:#ffffff04}.hero-art img{width:78px;height:90px;object-fit:contain;opacity:.9;transform:rotate(-8deg)}.orbit-dot{position:absolute;width:11px;height:11px;background:#d0dfae;border-radius:50%;top:47px;right:50px}.hero-chip{position:absolute;background:#e7eee0;color:#365540;font-size:9px;padding:7px 10px;border-radius:6px;right:10%;bottom:30px;transform:rotate(-8deg);box-shadow:0 6px 18px #0002}.focus-panel{padding:23px;display:flex;flex-direction:column}.focus-panel .row{gap:8px}.focus-panel h3{font-size:13px}.focus-panel .focus-label{color:var(--muted);font-size:11px;margin-top:6px}.timer-digits{font:500 43px/1.2 Manrope;letter-spacing:-2px;font-variant-numeric:tabular-nums;text-align:center;margin:21px 0 7px}.timer-caption{text-align:center;font-size:10px;color:var(--muted);margin-bottom:19px}.timer-controls{display:flex;gap:8px;margin-top:auto}.timer-controls .btn{flex:1}.focus-icon{color:#8da783}.stats-strip{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));margin-top:23px;background:var(--surface);border:1px solid var(--line);border-radius:13px;padding:20px 0}.stat{padding:0 20px;border-right:1px solid var(--line);display:flex;align-items:center;gap:13px}.stat:last-child{border:0}.stat-icon{width:36px;height:36px;background:var(--subtle);border-radius:10px;display:grid;place-items:center;color:#749581;flex-shrink:0}.stat-value{font:750 22px/1.3 Manrope;letter-spacing:-.5px}.stat-label{font-size:10px;color:var(--muted);margin-top:3px;white-space:nowrap}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.course-card{border:1px solid var(--line);background:var(--surface);border-radius:14px;overflow:hidden;transition:box-shadow .18s,border-color .18s;position:relative}.course-card:hover{border-color:#c8d7cb;box-shadow:0 9px 25px #233f3008}.course-art{height:125px;position:relative;overflow:hidden;display:flex;align-items:center;justify-content:center;color:var(--art-ink);background:var(--art-bg)}.course-art:before,.course-art:after{content:'';position:absolute;border:1px solid currentColor;opacity:.09;border-radius:50%;width:190px;height:190px;right:-30px;top:15px}.course-art:after{width:240px;height:240px;left:-120px;top:-155px}.course-art>svg{width:61px;height:61px;stroke-width:1.05;opacity:.85}.art-index{position:absolute;left:17px;top:14px;font-size:9px;font-weight:650;letter-spacing:1.3px;opacity:.6}.course-art .tag{position:absolute;left:15px;bottom:12px;color:var(--art-ink);background:#ffffff80;font-size:9px}.lavender{--art-bg:#eee9f6;--art-ink:#7c6995}.peach{--art-bg:#f7eae0;--art-ink:#b38362}.mint{--art-bg:#e6efe5;--art-ink:#668568}.blue{--art-bg:#e6edf6;--art-ink:#6985a6}.sand{--art-bg:#f1edde;--art-ink:#9c8c57}.save-button{position:absolute;right:12px;top:12px;width:29px;height:29px;background:#ffffffb8;border:1px solid #ffffffc9;display:grid;place-items:center;border-radius:7px;color:#767e78;z-index:2}.save-button[aria-pressed=true]{background:#fff;color:var(--green)}.save-button[aria-pressed=true] svg{fill:#dbeadd}.course-body{padding:17px 18px 18px}.course-title{font:750 14px Manrope;letter-spacing:-.25px;display:block;margin-bottom:6px}.course-title:after{content:'';position:absolute;inset:0;z-index:1}.course-description{font-size:11px;line-height:1.75;min-height:38px}.course-meta{display:flex;align-items:center;gap:10px;font-size:10px;color:var(--muted);margin:14px 0}.course-bottom{display:flex;justify-content:space-between;align-items:center;font-size:10px;color:var(--muted);gap:12px;border-top:1px solid var(--line);padding-top:13px}.course-bottom b{color:var(--green);font-size:11px;font-weight:600}.progress-track{height:4px;border-radius:6px;background:var(--line);overflow:hidden;margin-top:9px}.progress-track span{display:block;height:100%;background:#619679;border-radius:6px}.study-tools{display:grid;grid-template-columns:repeat(3,1fr);gap:15px}.tool-card{display:flex;align-items:center;gap:15px;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:12px;transition:border-color .15s}.tool-card:hover{border-color:#b8cebd}.tool-card>span{display:grid;place-items:center;width:40px;height:40px;background:var(--subtle);border-radius:11px;color:#789078}.tool-card h3{font-size:12px}.tool-card p{font-size:10px;margin-top:4px}.tool-card>svg{margin-left:auto;color:#9aaba0}.footnote{font-size:10px;color:#98a19b;margin-top:29px;display:flex;align-items:center;justify-content:center;gap:6px}
.filterbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:23px;flex-wrap:wrap}.filter-group{display:flex;gap:5px;flex-wrap:wrap}.filter{border:1px solid transparent;background:transparent;color:var(--muted);padding:8px 13px;min-height:36px;font-size:12px;border-radius:7px}.filter:hover{background:var(--surface)}.filter.active{background:var(--surface);border-color:var(--line);box-shadow:0 2px 3px #00000003;color:var(--green);font-weight:650}.field-search{display:flex;align-items:center;gap:9px;border:1px solid var(--line);background:var(--surface);border-radius:8px;padding:9px 12px;min-width:220px}.field-search input{border:0;background:transparent;color:var(--ink);outline:0;min-width:0;width:100%;font-size:12px}.field-search svg{color:#9aa39d}.results-count{font-size:11px;color:var(--muted);margin-bottom:15px}.empty{padding:55px 25px;text-align:center;border:1px dashed #ccd9cf;border-radius:16px;background:var(--surface);grid-column:1/-1}.empty>svg{color:#89a28f;margin-bottom:12px}.empty h2{margin-bottom:8px}.empty p{max-width:380px;margin:0 auto 20px;font-size:13px}.course-overview{display:grid;grid-template-columns:minmax(0,1fr) 270px;gap:24px}.course-banner{border-radius:16px;background:var(--art-bg);color:var(--art-ink);padding:28px;display:flex;align-items:center;gap:25px;margin-bottom:24px}.course-banner>svg{width:72px;height:72px;stroke-width:1.1}.course-banner h1{font-size:28px;color:#343e38;margin:8px 0}.course-banner p{color:#69716c;font-size:12px}.chapter-row{display:flex;align-items:center;gap:16px;padding:20px;border:1px solid var(--line);background:var(--surface);border-radius:12px;margin-top:12px;transition:border-color .15s}.chapter-row:hover{border-color:#adc9b6}.chapter-number{width:40px;height:43px;border-radius:10px;background:var(--subtle);display:grid;place-items:center;font-size:13px;color:var(--muted);flex-shrink:0}.chapter-row h3{font-size:14px}.chapter-row p{font-size:11px;margin-top:5px}.chapter-row>svg{margin-left:auto;color:#8fa297}.side-info{height:fit-content}.side-info h3{margin-bottom:14px}.info-line{display:flex;justify-content:space-between;gap:15px;padding:13px 0;border-bottom:1px solid var(--line);font-size:12px}.side-info .btn{width:100%;margin-top:20px}.reader-layout{display:grid;grid-template-columns:minmax(0,1fr) 250px;gap:26px;align-items:start}.reader-top{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:20px}.reader-top .row{flex-wrap:wrap}.reader{padding:33px 38px;background:var(--surface);border:1px solid var(--line);border-radius:15px;min-width:0}.reader-meta{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:11px;border-bottom:1px solid var(--line);padding-bottom:20px;margin-bottom:25px}.reading-content{font-size:var(--reading-size,16px);line-height:1.9;overflow-wrap:anywhere;color:var(--ink)}.reading-content p{color:inherit;margin:16px 0}.reading-content h2,.reading-content h3{font-size:25px;line-height:1.4;margin:0 0 22px}.reading-content h4{font-size:19px;margin:24px 0 12px}.reading-content ul,.reading-content ol{padding-left:23px;margin:18px 0}.reading-content li{margin:9px 0;padding-left:4px}.reading-content strong{font-weight:700}.reading-content blockquote{border-left:3px solid #7ba386;background:var(--green-soft);color:var(--green);margin:26px 0;padding:19px 21px;border-radius:0 10px 10px 0;font-size:.91em}.reading-content figure{margin:25px 0}.reading-content img{max-width:100%;height:auto;border-radius:10px;display:block}.reading-content table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;font-size:14px}.reading-content td,.reading-content th{padding:10px;border:1px solid var(--line)}.reader-nav{display:flex;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding-top:24px;margin-top:30px}.toc{position:sticky;top:100px;padding:18px}.toc h3{font-size:12px;padding:2px 7px 13px}.toc-list{max-height:calc(100dvh - 230px);overflow:auto;scrollbar-width:thin;display:flex;flex-direction:column;gap:3px}.toc-item{display:flex;align-items:flex-start;gap:9px;font-size:11px;padding:9px;border-radius:7px;color:var(--muted)}.toc-item span:first-child{font-size:10px;opacity:.7;min-width:16px}.toc-item:hover{background:var(--subtle)}.toc-item.active{color:var(--green);background:var(--green-soft);font-weight:650}.reading-progress{font-size:11px;margin-bottom:15px}.notes-list{display:flex;flex-direction:column;gap:12px}.note-row{position:relative;display:flex;align-items:center;gap:18px;padding:21px 23px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.note-row .note-symbol{width:47px;height:53px;background:var(--art-bg);color:var(--art-ink);display:grid;place-items:center;border-radius:10px;flex-shrink:0}.note-row h3{font-size:14px}.note-row p{font-size:11px;margin-top:5px}.note-row a:after{content:'';position:absolute;inset:0}.note-row .row{margin-left:auto}.note-row .save-button{position:relative;inset:auto;z-index:2;background:var(--subtle);border-color:var(--line);width:34px;height:34px}.note-row:hover{border-color:#bed2c3}.practice-modes{display:grid;grid-template-columns:repeat(3,1fr);gap:15px;margin-bottom:28px}.mode{background:var(--surface);border:1px solid var(--line);padding:22px;border-radius:13px;text-align:left;display:flex;flex-direction:column;gap:8px}.mode>svg{color:var(--green);margin-bottom:6px}.mode strong{font-size:13px}.mode span{font-size:11px;color:var(--muted);line-height:1.7}.mode.active{border-color:var(--green);box-shadow:0 0 0 1px var(--green);background:var(--green-soft)}.practice-row{display:flex;align-items:center;gap:16px}.practice-row .btn{margin-left:auto;flex-shrink:0}.practice-row p{font-size:12px;margin-top:5px}.session-wrap{max-width:850px;margin:0 auto}.session-heading{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-bottom:22px}.session-heading h1{font-size:24px}.session-heading p{font-size:12px;margin-top:5px}.question-panel{padding:30px}.question-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:11px;margin-bottom:16px}.question-title{font-size:23px;line-height:1.55;margin:25px 0;letter-spacing:-.5px}.answer{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--surface);border:1px solid var(--line);border-radius:10px;padding:15px;margin-bottom:10px;font-size:13px;line-height:1.6}.answer:disabled{opacity:1;cursor:default}.answer:not(:disabled):hover{border-color:#91b99f;background:var(--subtle)}.answer-letter{width:30px;height:30px;border-radius:7px;background:var(--subtle);display:grid;place-items:center;flex-shrink:0;font-size:12px;font-weight:650}.answer.selected:not(.incorrect):not(.correct){border-color:var(--green);background:var(--green-soft)}.answer.correct{border-color:#519a70;background:#eef8f0;color:#27603e}.answer.incorrect{border-color:#d8a296;background:#fcf0ec;color:#974b3c}.explanation{padding:18px;border-radius:10px;background:var(--green-soft);margin-top:18px}.explanation b{color:var(--green);font-size:13px}.explanation p{font-size:12px;margin-top:6px;line-height:1.8}.session-footer{display:flex;justify-content:space-between;align-items:center;gap:15px;margin-top:25px}.question-dots{display:flex;gap:7px}.question-dot{width:32px;height:32px;border:1px solid var(--line);background:var(--surface);font-size:11px}.question-dot.active{border-color:var(--green);color:var(--green);font-weight:700}.question-dot.answered{background:var(--green-soft)}.timer-badge{display:inline-flex;gap:7px;align-items:center;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-variant-numeric:tabular-nums;font-size:13px}.flashcard{width:100%;min-height:320px;background:var(--surface);border:1px solid #cedbd1;border-radius:16px;text-align:center;padding:40px 35px;display:flex;flex-direction:column;align-items:center;justify-content:center;box-shadow:0 8px 28px #203a2806}.flashcard.revealed{background:var(--green-soft)}.flashcard h2{max-width:570px;font-size:26px;line-height:1.6;margin:24px 0}.flashcard p{font-size:12px}.rating-buttons{display:flex;justify-content:center;gap:12px;margin-top:25px}.result-panel{text-align:center;padding:40px}.result-icon{width:60px;height:60px;background:var(--green-soft);color:var(--green);border-radius:50%;display:grid;place-items:center;margin:0 auto 18px}.result-score{font:800 54px Manrope;letter-spacing:-2px;color:var(--green);margin:15px 0 5px}.result-panel p{font-size:13px;max-width:450px;margin:10px auto 24px}.result-panel .row{justify-content:center;flex-wrap:wrap}.review-item{padding:20px 0;border-bottom:1px solid var(--line)}.review-item:last-child{border:0}.review-item h3{font-size:14px}.review-item p{font-size:12px;margin-top:8px}.metric-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:25px}.metric h3{font-size:12px;color:var(--muted);font-family:inherit;font-weight:500}.metric strong{display:block;font:750 30px Manrope;margin-top:13px}.activity-row{display:flex;align-items:center;gap:13px;padding:17px 0;border-bottom:1px solid var(--line)}.activity-row:last-child{border:0}.activity-row h3{font-size:12px}.activity-row p{font-size:11px;margin-top:3px}.activity-row>b{margin-left:auto;color:var(--green);font-size:13px}.course-progress-row{display:block;padding:18px 0;border-bottom:1px solid var(--line)}.course-progress-row:last-child{border:0}.course-progress-row .row{font-size:12px;justify-content:space-between}.settings-layout{max-width:800px}.settings-section{margin-bottom:20px}.settings-section h2{margin-bottom:20px}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:20px}.field-label{display:block;font-size:12px;font-weight:600;margin-bottom:8px}.field{width:100%;border:1px solid var(--line);background:var(--bg);padding:11px 13px;color:var(--ink);font-size:13px}.setting-row{display:flex;align-items:center;justify-content:space-between;gap:25px;padding:18px 0;border-bottom:1px solid var(--line)}.setting-row:last-child{border-bottom:0}.setting-row b{font-size:12px}.setting-row p{font-size:11px;margin-top:4px;max-width:420px}.setting-row select{background:var(--bg);border:1px solid var(--line);color:var(--ink);padding:9px;font-size:12px}.settings-section .btn{margin-top:20px}.danger{color:#a85245!important}.storage-notice{background:#fff5df;color:#80652c;padding:12px 18px;border-radius:10px;font-size:12px;margin-bottom:20px}
dialog{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:17px;width:min(600px,calc(100vw - 32px));padding:0;max-height:85dvh;box-shadow:0 25px 100px #15322530}dialog::backdrop{background:#1c302c66;backdrop-filter:blur(4px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 25px 15px}.dialog-head h2{font-size:18px}.dialog-body{padding:0 25px 25px}.dialog-body p{font-size:13px;line-height:1.8;margin:10px 0 20px}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;flex-wrap:wrap}
#dialog.dialog-paywall{width:min(560px,94vw);max-height:min(92dvh,820px);overflow:auto;border:0;padding:0;background:var(--surface)}
#dialog.dialog-paywall::backdrop{background:#0b161280;backdrop-filter:blur(6px)}
.paywall{position:relative}
.paywall-close{position:absolute;top:12px;right:12px;z-index:3;background:rgba(255,255,255,.72);border-radius:10px}
[data-theme=dark] .paywall-close{background:rgba(33,33,33,.8)}
.paywall-hero{padding:32px 28px 22px;background:linear-gradient(160deg,#e8f5ef 0%,#f7fbf8 48%,var(--surface) 100%);border-bottom:1px solid var(--line);text-align:center;animation:paywall-in .35s ease both}
[data-theme=dark] .paywall-hero{background:linear-gradient(160deg,#163528 0%,#181818 55%,var(--surface) 100%)}
.paywall-hero-mark{width:56px;height:56px;margin:0 auto 14px;border-radius:16px;display:grid;place-items:center;background:var(--green);color:#fff;box-shadow:0 10px 24px #22634e33}
[data-theme=dark] .paywall-hero-mark{color:#04140c}
.paywall-hero .eyebrow{color:var(--green);margin-bottom:8px}
.paywall-hero h2{margin:0 0 10px;font:800 24px/1.2 Manrope,system-ui,sans-serif;letter-spacing:-.6px}
.paywall-hero p{margin:0 auto;max-width:38ch;font-size:14px;line-height:1.55;color:var(--muted)}
.paywall-chip{display:flex;align-items:flex-start;gap:10px;margin:16px 22px 0;padding:12px 14px;border-radius:12px;border:1px solid var(--line);background:var(--subtle);font-size:13px;line-height:1.45;color:var(--ink);animation:paywall-in .4s ease .05s both}
.paywall-chip svg{flex-shrink:0;margin-top:2px;color:var(--green)}
.paywall-benefits{display:grid;grid-template-columns:1fr 1fr;gap:8px;padding:16px 22px 8px;max-height:min(42dvh,320px);overflow:auto}
.paywall-benefit{display:flex;gap:10px;align-items:flex-start;padding:10px 11px;border:1px solid var(--line);border-radius:12px;background:var(--surface);animation:paywall-in .4s ease both;animation-delay:calc(.06s + var(--i)*.04s)}
.paywall-benefit svg{flex-shrink:0;color:var(--green);margin-top:1px}
.paywall-benefit b{display:block;font-size:12.5px;margin-bottom:2px}
.paywall-benefit span{display:block;font-size:11.5px;color:var(--muted);line-height:1.35}
.paywall-cta{display:flex;flex-direction:column;gap:10px;padding:10px 22px 8px}
.paywall-cta-primary{width:100%;min-height:48px;justify-content:center;font-size:15px;animation:paywall-pulse 1.8s ease .5s 2}
.paywall-dismiss{border:0;background:transparent;color:var(--muted);font:550 13px inherit;cursor:pointer;padding:8px;align-self:center}
.paywall-dismiss:hover{color:var(--ink)}
.paywall-trust{margin:4px 22px 22px;text-align:center;font-size:11px;color:var(--muted);line-height:1.45}
@keyframes paywall-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes paywall-pulse{0%,100%{box-shadow:0 0 0 0 transparent}40%{box-shadow:0 0 0 6px #22634e22}}
@media(prefers-reduced-motion:reduce){.paywall-hero,.paywall-chip,.paywall-benefit,.paywall-cta-primary{animation:none!important}}
#dialog.dialog-exam-preview{width:min(640px,94vw)}
.paywall-exam{display:flex;flex-direction:column}
.paywall-exam .paywall-cta-primary{animation:none}
.exam-preview{position:relative;padding:20px 20px 14px;background:linear-gradient(180deg,var(--subtle) 0%,var(--surface) 100%);border-bottom:1px solid var(--line);overflow:hidden;pointer-events:none;user-select:none}
.exam-preview-chrome{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;min-height:18px}
.exam-preview-eyebrow{position:relative;display:block;min-width:12ch;height:14px;font:700 10px Manrope,system-ui,sans-serif;letter-spacing:1.2px;color:var(--green)}
.exam-preview-eyebrow .lbl{position:absolute;left:0;top:0;opacity:0;white-space:nowrap}
.exam-preview-eyebrow .lbl-tf{animation:exam-lbl-tf 9.2s ease forwards}
.exam-preview-eyebrow .lbl-match{animation:exam-lbl-match 9.2s ease forwards}
.exam-preview-eyebrow .lbl-mcq{animation:exam-lbl-mcq 9.2s ease forwards}
.exam-preview-eyebrow .lbl-grade{animation:exam-lbl-grade 9.2s ease forwards}
.exam-preview-timer{display:inline-flex;align-items:center;gap:5px;font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums}
.exam-preview-stage{position:relative;min-height:196px}
.exam-preview-scene{position:absolute;inset:0;opacity:0;pointer-events:none}
.exam-preview-scene.scene-tf{animation:exam-scene-tf 9.2s ease forwards}
.exam-preview-scene.scene-match{animation:exam-scene-match 9.2s ease forwards}
.exam-preview-scene.scene-mcq{animation:exam-scene-mcq 9.2s ease forwards}
.exam-preview-scene.scene-grade{animation:exam-scene-grade 9.2s ease forwards}
.exam-preview-q{margin:0 0 14px;font:650 15px/1.45 Manrope,system-ui,sans-serif;color:var(--ink)}
.exam-preview-tf{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.exam-preview-tf-btn{display:grid;place-items:center;min-height:48px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font:700 13px Manrope,system-ui,sans-serif;opacity:0;animation:exam-tf-in .4s ease .55s forwards}
.exam-preview-tf-btn:nth-child(2){animation-delay:.65s}
.exam-preview-tf-btn.is-pick{animation:exam-tf-in .4s ease .65s forwards,exam-pick .35s ease 1.25s forwards}
.exam-preview-match{display:grid;grid-template-columns:1fr 56px 1fr;gap:4px;align-items:stretch;min-height:160px}
.exam-preview-col{display:flex;flex-direction:column;gap:8px;z-index:2}
.exam-preview-card{position:relative;display:flex;align-items:center;gap:8px;padding:10px 11px;border:1px solid #c5d9cc;border-radius:10px;background:var(--surface);font-size:12px;line-height:1.3;opacity:0}
[data-theme=dark] .exam-preview-card{border-color:#2a4a3a}
.exam-preview-scene.scene-match .exam-preview-card.left{animation:exam-preview-card-left .45s ease both;animation-delay:calc(2.7s + var(--i)*.12s)}
.exam-preview-scene.scene-match .exam-preview-card.right{animation:exam-preview-card-right .45s ease both;animation-delay:calc(2.9s + var(--i)*.12s)}
.exam-preview-num,.exam-preview-card .answer-letter{flex-shrink:0;width:22px;height:22px;border-radius:6px;display:grid;place-items:center;background:var(--green-soft);color:var(--green);font:700 11px Manrope,system-ui,sans-serif}
.exam-preview-dot{position:absolute;width:8px;height:8px;border-radius:50%;background:var(--green);top:50%;transform:translateY(-50%);opacity:0}
.exam-preview-scene.scene-match .exam-preview-card.left .exam-preview-dot{right:-4px;animation:exam-preview-dot .35s ease both;animation-delay:calc(3.35s + var(--i)*.18s)}
.exam-preview-scene.scene-match .exam-preview-card.right .exam-preview-dot{left:-4px;animation:exam-preview-dot .35s ease both;animation-delay:calc(3.5s + var(--i)*.18s)}
.exam-preview-lines{width:100%;height:100%;align-self:stretch;overflow:visible}
.exam-preview-path{fill:none;stroke:var(--green);stroke-width:2.4;stroke-linecap:round;opacity:.8;stroke-dasharray:200;stroke-dashoffset:200}
.exam-preview-scene.scene-match .exam-preview-path.p1{animation:exam-preview-draw .85s ease 3.4s forwards}
.exam-preview-scene.scene-match .exam-preview-path.p2{animation:exam-preview-draw .85s ease 3.6s forwards}
.exam-preview-scene.scene-match .exam-preview-path.p3{animation:exam-preview-draw .85s ease 3.8s forwards}
.exam-preview-mcq{display:flex;flex-direction:column;gap:8px}
.exam-preview-mcq-opt{display:flex;align-items:center;gap:10px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);font-size:13px;opacity:0;animation:exam-mcq-in .35s ease both}
.exam-preview-mcq-opt:nth-child(1){animation-delay:5.25s}
.exam-preview-mcq-opt:nth-child(2){animation-delay:5.38s}
.exam-preview-mcq-opt:nth-child(3){animation-delay:5.5s}
.exam-preview-mcq-opt:nth-child(4){animation-delay:5.62s}
.exam-preview-mcq-opt b{width:22px;height:22px;border-radius:6px;display:grid;place-items:center;background:var(--subtle);font:700 11px Manrope,system-ui,sans-serif}
.exam-preview-mcq-opt.is-pick{animation:exam-mcq-in .35s ease 5.38s both,exam-pick .35s ease 6.15s forwards}
.exam-preview-grade{display:flex;align-items:center;gap:14px;padding:14px;border:1px solid var(--line);border-radius:12px;background:var(--surface);height:100%;box-sizing:border-box}
.exam-preview-ring{width:56px;height:56px;border-radius:50%;flex-shrink:0;display:grid;place-items:center;position:relative;background:conic-gradient(var(--green) 0%,var(--line) 0)}
.exam-preview-scene.scene-grade .exam-preview-ring{animation:exam-preview-ring-fill 1s ease 7.7s forwards}
.exam-preview-ring:before{content:'';position:absolute;inset:5px;border-radius:50%;background:var(--surface)}
.exam-preview-ring span{position:relative;font:750 12px Manrope,system-ui,sans-serif;color:var(--ink);opacity:0}
.exam-preview-scene.scene-grade .exam-preview-ring span{animation:paywall-in .3s ease 8.15s forwards}
.exam-preview-grade-copy{min-width:0;flex:1}
.exam-preview-grade-copy b{display:block;font-size:13px;margin-bottom:2px}
.exam-preview-grade-copy p{margin:0;font-size:12px;color:var(--muted)}
.exam-preview-bars{display:flex;flex-direction:column;gap:5px;margin-top:10px}
.exam-preview-bars span{display:block;height:5px;border-radius:99px;background:var(--line);position:relative;overflow:hidden}
.exam-preview-bars span:after{content:'';position:absolute;inset:0 auto 0 0;width:0;background:var(--green);border-radius:inherit}
.exam-preview-scene.scene-grade .exam-preview-bars span:nth-child(1):after{animation:exam-preview-bar .7s ease 7.85s forwards;--w:100%}
.exam-preview-scene.scene-grade .exam-preview-bars span:nth-child(2):after{animation:exam-preview-bar .7s ease 7.97s forwards;--w:88%}
.exam-preview-scene.scene-grade .exam-preview-bars span:nth-child(3):after{animation:exam-preview-bar .7s ease 8.09s forwards;--w:72%}
.exam-preview-lock{padding:8px 22px 4px;text-align:center}
.exam-preview-lock .paywall-hero-mark{margin-top:4px}
.exam-preview-lock .eyebrow{margin-bottom:8px}
.exam-preview-lock h2{margin:0 0 10px;font:800 22px/1.25 Manrope,system-ui,sans-serif;letter-spacing:-.5px}
.exam-preview-lock p{margin:0 auto;max-width:42ch;font-size:13.5px;line-height:1.55;color:var(--muted)}
.exam-preview-lock .paywall-cta{padding-top:16px}
.exam-preview-lock .paywall-trust{margin-top:0}
@keyframes exam-scene-tf{0%,2%{opacity:0}6%,20%{opacity:1}24%,100%{opacity:0}}
@keyframes exam-scene-match{0%,24%{opacity:0}28%,48%{opacity:1}52%,100%{opacity:0}}
@keyframes exam-scene-mcq{0%,52%{opacity:0}56%,74%{opacity:1}78%,100%{opacity:0}}
@keyframes exam-scene-grade{0%,78%{opacity:0}82%,100%{opacity:1}}
@keyframes exam-lbl-tf{0%,2%{opacity:0}6%,20%{opacity:1}24%,100%{opacity:0}}
@keyframes exam-lbl-match{0%,24%{opacity:0}28%,48%{opacity:1}52%,100%{opacity:0}}
@keyframes exam-lbl-mcq{0%,52%{opacity:0}56%,74%{opacity:1}78%,100%{opacity:0}}
@keyframes exam-lbl-grade{0%,78%{opacity:0}82%,100%{opacity:1}}
@keyframes exam-tf-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
@keyframes exam-mcq-in{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
@keyframes exam-pick{to{border-color:var(--green);background:var(--green-soft);box-shadow:0 0 0 1px var(--green)}}
@keyframes exam-preview-card-left{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
@keyframes exam-preview-card-right{from{opacity:0;transform:translateX(8px)}to{opacity:1;transform:none}}
@keyframes exam-preview-dot{from{opacity:0;transform:translateY(-50%) scale(.4)}to{opacity:1;transform:translateY(-50%) scale(1)}}
@keyframes exam-preview-draw{to{stroke-dashoffset:0}}
@keyframes exam-preview-ring-fill{0%{background:conic-gradient(var(--green) 0%,var(--line) 0)}100%{background:conic-gradient(var(--green) 84%,var(--line) 0)}}
@keyframes exam-preview-bar{from{width:0}to{width:var(--w)}}
@media(prefers-reduced-motion:reduce){
 .exam-preview-scene,.exam-preview-eyebrow .lbl{animation:none!important;opacity:0}
 .exam-preview-scene.scene-grade,.exam-preview-eyebrow .lbl-grade{opacity:1}
 .exam-preview-tf-btn,.exam-preview-mcq-opt,.exam-preview-card,.exam-preview-path,.exam-preview-ring,.exam-preview-ring span,.exam-preview-bars span:after,.exam-preview-dot{animation:none!important;opacity:1;transform:none;stroke-dashoffset:0}
 .exam-preview-ring{background:conic-gradient(var(--green) 84%,var(--line) 0)}
 .exam-preview-bars span:after{width:var(--w)}
 .exam-preview-tf-btn.is-pick,.exam-preview-mcq-opt.is-pick{border-color:var(--green);background:var(--green-soft)}
}
@media(max-width:520px){
 .exam-preview{padding:16px 14px 12px}
 .exam-preview-match{grid-template-columns:1fr 36px 1fr;gap:2px}
 .exam-preview-card{padding:8px 9px;font-size:11px}
 .exam-preview-stage{min-height:210px}
 .exam-preview-lock{padding-left:16px;padding-right:16px}
 .exam-preview-lock h2{font-size:20px}
 .exam-preview-lock .paywall-cta,.exam-preview-lock .paywall-trust{margin-left:0;margin-right:0}
}
@media(max-width:520px){.paywall-benefits{grid-template-columns:1fr}.paywall-hero{padding:28px 20px 18px}.paywall-hero h2{font-size:22px}.paywall-chip,.paywall-benefits,.paywall-cta,.paywall-trust{margin-left:16px;margin-right:16px}.paywall-benefits,.paywall-cta{padding-left:0;padding-right:0}.paywall-trust{margin-left:16px;margin-right:16px}}.search-dialog-input{display:flex;align-items:center;gap:12px;border-bottom:1px solid var(--line);padding:16px 25px}.search-dialog-input input{width:100%;background:none;border:0;color:var(--ink);outline:none;font-size:15px}.search-results{max-height:50dvh;overflow:auto;padding:12px}.search-chips{display:flex;flex-wrap:wrap;gap:6px;padding:0 4px 12px}.search-chip{appearance:none;border:1px solid var(--line);background:var(--surface);color:var(--muted);border-radius:999px;padding:6px 11px;font:inherit;font-size:11px;font-weight:650;cursor:pointer}.search-chip:hover{color:var(--ink);background:var(--subtle)}.search-chip.is-active{border-color:var(--green);color:var(--green);background:var(--green-soft)}.search-group{margin-bottom:10px}.search-group-label{font-size:10px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);padding:4px 12px 6px}.search-result{display:flex;align-items:center;gap:13px;padding:12px;border-radius:8px;width:100%;background:none;border:0;color:inherit;font:inherit;text-align:left;cursor:pointer}.search-result:hover,.search-result.is-active{background:var(--subtle)}.search-result.is-active{outline:1px solid var(--green)}.search-result b{font-size:12px;display:block}.search-result span{font-size:10px;color:var(--muted)}.search-result svg{color:var(--green);flex-shrink:0}.search-more{font-size:11px;padding:4px 12px 8px;margin:0}.search-hint{padding:10px 24px;border-top:1px solid var(--line);font-size:10px;color:var(--muted)}#toast{position:fixed;left:calc(50% + var(--side)/2);bottom:26px;transform:translate(-50%,20px);padding:12px 20px;border-radius:10px;background:#243f31;color:#fff;box-shadow:0 6px 25px #0002;font-size:12px;z-index:200;opacity:0;pointer-events:none;transition:opacity .15s,transform .15s;max-width:90vw}#toast.visible{opacity:1;transform:translate(-50%,0)}.mobile-menu,.mobile-close,.drawer-backdrop{display:none}.collapsed{--side:78px}.collapsed .sidebar{padding:30px 11px 18px}.collapsed .brand{padding:0 10px 34px}.collapsed .brand-name,.collapsed .sidebar-label,.collapsed .nav-link span,.collapsed .sidebar-note,.collapsed .profile-text,.collapsed .sidebar-footer .icon-button{display:none}.collapsed .nav-link{justify-content:center;padding:12px}.collapsed .nav-link.active:after{display:none}.collapsed .sidebar-footer{padding:18px 10px 0}.collapsed .side-divider{margin:21px 8px}
[data-theme=dark]{color-scheme:dark;--bg:#0f0f0f;--surface:#212121;--ink:#f1f1f1;--muted:#aaa;--line:#303030;--subtle:#181818;--green:#3dd68c;--green-hover:#2fb873;--green-soft:#163528;--shadow:none;--player:#000}[data-theme=dark] .btn{background:var(--green);color:#04140c}[data-theme=dark] .btn.secondary{background:var(--surface);color:var(--ink);border-color:var(--line)}[data-theme=dark] .sidebar-note{background:var(--subtle);border-color:var(--line)}[data-theme=dark] .hero{background:#163528}[data-theme=dark] .save-button{color:var(--green)}[data-theme=dark] .btn.light{background:#e5f1df;color:#244331}[data-theme=dark] .answer.correct{background:#163528;color:#b8f0d0}[data-theme=dark] .answer.incorrect{background:#3a1d18;color:#f2c4b9}[data-theme=dark] .answer.selected:not(.incorrect):not(.correct){background:var(--green-soft);border-color:var(--green)}[data-theme=dark] .answer.incorrect,[data-theme=dark] .answer.selected.incorrect{background:#3a1d18;color:#f2c4b9;border-color:#8a4a3f}[data-theme=dark] .answer.correct,[data-theme=dark] .answer.selected.correct{background:#163528;color:#b8f0d0;border-color:#3d8f63}[data-theme=dark] .nav-link.active{color:var(--green);background:var(--green-soft)}[data-theme=dark] .brand-mark{background:#1a3d2e}[data-theme=dark] .watch-player,[data-theme=dark] .video-thumb{background:#000}[data-theme=dark] .context-menu{background:#282828;border-color:#3f3f3f;box-shadow:0 8px 28px #0008}[data-theme=dark] .timer-badge.urgent,[data-theme=dark] .session-chrome.exam-urgent .timer-badge{background:#3a1d18;border-color:#7a3a30;color:#f2c4b9}
@media(min-width:1550px){.content{padding-top:40px}.dashboard-top{grid-template-columns:minmax(0,1fr) 300px}.hero{min-height:286px}.hero h2{font-size:39px}.course-art{height:143px}}
@media(max-width:1200px){:root{--side:214px}.content{padding:28px 26px 60px}.topbar{padding:0 26px}.sidebar{padding-left:12px;padding-right:12px}.dashboard-top{grid-template-columns:minmax(0,1fr) 245px}.hero{padding:28px}.hero h2{font-size:29px}.stat{padding:0 14px;gap:9px}.stat-icon{display:none}.course-grid{gap:14px}.course-description{min-height:57px}.course-overview{grid-template-columns:minmax(0,1fr) 235px}.reader-layout{grid-template-columns:minmax(0,1fr) 210px;gap:18px}.reader{padding:28px}.workspace-label,.topbar-separator{display:none}.tool-card{padding:16px;gap:10px}.tool-card>span{width:32px;height:32px}.tool-card p{font-size:9px}}
@media(max-width:1000px){.course-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.dashboard-top{grid-template-columns:1fr}.hero{min-height:250px}.hero-copy{width:70%}.hero h2{font-size:34px}.focus-panel{display:grid;grid-template-columns:1fr auto;align-items:center;gap:0 20px;padding:18px 23px}.focus-panel .timer-digits{grid-column:2;grid-row:1/3;font-size:31px;margin:0}.focus-panel .timer-caption{display:none}.focus-panel .timer-controls{grid-column:1/-1;margin-top:15px}.stats-strip{margin-top:18px}.study-tools{grid-template-columns:1fr}.tool-card p{font-size:11px}.reader-layout{grid-template-columns:1fr}.toc{position:static;grid-row:1;padding:15px}.toc-list{max-height:190px}.toc h3{padding-bottom:0}.toc details[open] h3{padding-bottom:10px}.toc details summary{cursor:pointer}.toc details:not([open]) .reading-progress{display:none}.course-overview{grid-template-columns:1fr}.metric-grid{grid-template-columns:1fr 1fr}.search-trigger{width:190px}.heading-extra{display:none}.course-description{min-height:38px}}
@media(max-width:760px){:root,.collapsed{--side:0px}.sidebar,.collapsed .sidebar{width:260px;padding:26px 18px;transform:translateX(-100%);transition:transform .2s ease;z-index:80}.brand,.collapsed .brand{padding:0 12px 30px}.collapsed .brand-name,.collapsed .sidebar-label,.collapsed .nav-link span,.collapsed .profile-text{display:initial}.collapsed .nav-link{justify-content:flex-start;padding:10px 14px}.collapsed .sidebar-footer .icon-button{display:grid}.collapsed .sidebar-footer{padding:19px 10px 0}.collapsed .sidebar-note{display:block}.drawer-open .sidebar{transform:translateX(0)}.drawer-open .drawer-backdrop{display:block;position:fixed;inset:0;border:0;border-radius:0;background:#112e215c;backdrop-filter:blur(3px);z-index:70}.drawer-open{overflow:hidden}.mobile-close{display:grid;position:absolute;right:12px;top:25px}.sidebar .brand{font-size:22px}.mobile-menu{display:inline-grid}.desktop-toggle{display:none}.topbar{height:66px;padding:0 18px;gap:10px}.topbar-left,.topbar-right{gap:10px}.breadcrumb{font-size:11px}.breadcrumb .crumb-root,.breadcrumb>svg{display:none}.search-trigger{width:35px;height:35px;justify-content:center;padding:0;background:none;border:0}.search-trigger span,.search-trigger kbd{display:none}.topbar-right>.avatar{width:31px;height:31px}.content{padding:26px 20px 50px}h1{font-size:28px}.page-heading{margin-bottom:23px;align-items:flex-start}.page-heading p{font-size:12px;line-height:1.7}.page-heading>.btn{font-size:11px;padding:10px}.hero{padding:28px;min-height:260px}.hero h2{font-size:31px}.hero-copy{width:70%}.hero-art{width:35%;opacity:.65}.hero-art img{width:60px;height:70px}.hero-chip{display:none}.course-grid{gap:15px}.stats-strip{padding:17px 0}.stat{padding:0 12px}.stat-value{font-size:20px}.stat-label{font-size:9px}.study-tools{grid-template-columns:1fr}.section-heading h2{font-size:18px}.section-heading .text-link{font-size:11px}.course-art{height:122px}.course-title{font-size:13px}.course-body{padding:15px}.course-description{font-size:11px}.course-meta{font-size:9px;gap:7px}.course-bottom{font-size:9px}.cols-2{grid-template-columns:1fr}.practice-modes{gap:10px}.mode{padding:16px}.mode span{font-size:10px}.practice-row{flex-wrap:wrap}.practice-row .btn{margin-left:0}.note-row{padding:18px;gap:13px}.note-row .tag{display:none}.reader{padding:24px}.reader-nav{flex-wrap:wrap}.reader-nav .btn{flex:1}.question-panel{padding:23px}.question-title{font-size:20px}.flashcard{min-height:300px;padding:25px}.flashcard h2{font-size:23px}.session-footer{flex-wrap:wrap}.form-row{grid-template-columns:1fr}.setting-row{gap:15px}.course-banner{padding:23px;gap:15px}.course-banner h1{font-size:23px}.course-banner>svg{width:50px;height:50px}#toast{bottom:18px;left:50%}.sidebar-note{margin-top:15px}.reader-meta,.reader-top{flex-wrap:wrap}}
@media(max-width:440px){.content{padding-left:16px;padding-right:16px}.hero{padding:25px}.hero-copy{width:100%}.hero-art{opacity:.1;width:70%;right:-45px}.hero h2{font-size:31px}.course-grid{grid-template-columns:1fr}.course-art{height:145px}.course-title{font-size:16px}.course-description{min-height:0;font-size:12px}.course-meta,.course-bottom{font-size:11px}.course-body{padding:19px}.stats-strip{grid-template-columns:1fr 1fr;padding:0}.stat{padding:17px 20px}.stat:nth-child(2){border-right:0}.stat:nth-child(-n+2){border-bottom:1px solid var(--line)}.stat-label{font-size:10px}.stat-value{font-size:23px}.stat-icon{display:grid;width:29px;height:29px}.practice-modes{grid-template-columns:1fr}.mode{display:grid;grid-template-columns:28px 1fr;gap:0 12px;padding:16px}.mode svg{grid-row:1/3;margin-top:4px}.mode span{font-size:11px;margin-top:3px}.note-row .note-symbol{width:37px;height:43px}.note-row h3{font-size:12px}.note-row p{font-size:10px}.note-row{gap:10px;padding:16px}.note-row .row{gap:6px}.note-row .row>svg{display:none}.session-heading h1{font-size:20px}.result-panel{padding:30px 20px}.metric{padding:20px}.question-dots{gap:5px}.question-dot{width:28px;height:28px}.filterbar{align-items:stretch}.field-search{width:100%}.setting-row{align-items:flex-start;flex-direction:column}.reader{padding:20px}.question-panel{padding:20px}.question-title{font-size:18px}.answer{font-size:12px;padding:12px}.flashcard h2{font-size:21px}.rating-buttons{flex-wrap:wrap}.dialog-head{padding:20px}.dialog-body{padding:0 20px 20px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important;scroll-behavior:auto!important}}
.help-nav{border:0;background:transparent;text-align:left;width:100%}.sidebar{overflow-y:auto;scrollbar-width:thin}.toc summary{cursor:pointer;margin-bottom:12px}.course-title:focus-visible:after{outline:3px solid #66ae8f;outline-offset:-3px;border-radius:14px}.note-row a:focus-visible:after{outline:3px solid #66ae8f;outline-offset:-3px;border-radius:12px}.reading-content h1{font-size:25px;line-height:1.4;margin:0 0 22px}
@media print{.sidebar,.topbar,.reader-top,.toc,.reader-nav,.footnote,#toast,.skip-link,.context-menu{display:none!important}.workspace{margin:0}.content{padding:0}.reader-layout{display:block}.reader{border:0;padding:0}.reading-content{font-size:12pt}.reading-content img{max-height:500px;object-fit:contain}body{background:#fff;color:#000}}

/* YouTube-like videos */
.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.video-card{display:block;border-radius:14px;transition:transform .18s ease,filter .18s ease}
.video-card:hover{transform:translateY(-3px) scale(1.01);filter:brightness(1.05)}
.video-thumb{position:relative;aspect-ratio:16/9;border-radius:14px;overflow:hidden;isolation:isolate;color:#fff;background:linear-gradient(145deg,var(--vt1,#1a3d2e),var(--vt2,#2f7a55) 55%,#0d1a14);box-shadow:0 10px 28px #00000022;display:block}
.vt-glow{position:absolute;width:160%;height:90%;left:-20%;top:-35%;background:radial-gradient(circle at 30% 40%,var(--vt3,#c8f0d8) 0%,transparent 55%);opacity:.28;pointer-events:none}
.vt-ring{position:absolute;right:-18%;bottom:-40%;width:70%;aspect-ratio:1;border-radius:50%;border:18px solid #ffffff18;pointer-events:none}
.vt-watermark{position:absolute;right:8px;bottom:-8px;font:900 92px/1 Manrope,system-ui,sans-serif;letter-spacing:-4px;color:#ffffff14;pointer-events:none;user-select:none}
.vt-course{position:absolute;top:12px;left:12px;z-index:2;max-width:58%;padding:5px 9px;border-radius:7px;background:#00000055;backdrop-filter:blur(6px);font:750 10px/1.2 Manrope,system-ui,sans-serif;letter-spacing:.3px;text-transform:uppercase;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.vt-badge{position:absolute;top:12px;right:12px;z-index:2;padding:5px 8px;border-radius:7px;background:#ffde59;color:#1a1400;font:800 10px/1 Manrope,system-ui,sans-serif;letter-spacing:.4px;box-shadow:0 4px 12px #0004}
.vt-play{position:absolute;left:50%;top:42%;z-index:2;transform:translate(-50%,-50%);width:52px;height:52px;border-radius:50%;display:grid;place-items:center;background:#ffffffee;color:#0f0f0f;box-shadow:0 8px 24px #0005;transition:transform .18s ease}
.video-card:hover .vt-play{transform:translate(-50%,-50%) scale(1.08)}
.video-card.is-locked .vt-play{background:#00000066;color:#fff}
.video-thumb.vt-editing{background:linear-gradient(155deg,#2a2a2a 0%,#3a3a3a 45%,#1f1f1f 100%);color:#f2f2f2;box-shadow:inset 0 0 0 2px #ffffff22,0 8px 22px #00000018;filter:none}
.video-thumb.vt-editing::before{content:"";position:absolute;inset:0;background:linear-gradient(145deg,color-mix(in srgb,var(--vt2) 28%,transparent),transparent 60%);opacity:.55;pointer-events:none}
.vt-stripes{position:absolute;inset:0;background:repeating-linear-gradient(-32deg,#ffffff00 0 10px,#ffffff0d 10px 20px);pointer-events:none}
.vt-badge-edit{background:#111;color:#f5f5f5;border:1px solid #ffffff55;box-shadow:none;letter-spacing:.6px}
.vt-edit-mark{position:absolute;left:50%;top:40%;z-index:2;transform:translate(-50%,-50%);width:58px;height:58px;border-radius:16px;display:grid;place-items:center;background:#ffffff14;border:1.5px dashed #ffffff66;color:#fff;backdrop-filter:blur(4px)}
.video-card.is-editing:hover{transform:none;filter:none}
.video-card.is-editing:hover .vt-edit-mark{background:#ffffff1f}
.video-thumb.vt-editing .vt-title{opacity:.88;font-weight:700;text-shadow:none;bottom:38px}
.video-thumb.vt-editing .vt-ch{opacity:.7}
.vt-edit-note{position:absolute;right:12px;bottom:12px;z-index:2;font:650 11px/1 Manrope,system-ui,sans-serif;color:#ffffffb8}
.vt-title{position:absolute;left:12px;right:12px;bottom:34px;z-index:2;margin:0;font:800 17px/1.2 Manrope,system-ui,sans-serif;letter-spacing:-.4px;text-shadow:0 2px 10px #0008;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.vt-ch{position:absolute;left:12px;bottom:12px;z-index:2;font:800 11px/1 Manrope,system-ui,sans-serif;letter-spacing:.8px;opacity:.9}
.vt-dur{position:absolute;right:12px;bottom:12px;z-index:2;padding:3px 7px;border-radius:5px;background:#000a;font:700 11px/1 Manrope,system-ui,sans-serif}
.watch-layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:22px;align-items:start}
.watch-player{display:block;width:100%;padding:0;border:0;text-align:left;background:var(--player);border-radius:14px;overflow:hidden;color:#fff;cursor:pointer;font:inherit}
.watch-stage{position:relative;aspect-ratio:16/9;display:grid;place-items:center;background:linear-gradient(160deg,#1a1a1a,#0a0a0a 55%,#13241c)}
.watch-stage-art{opacity:.35;color:#9ccbaa}
.watch-big-play{width:68px;height:68px;border-radius:50%;background:#fff;color:#0f0f0f;display:grid;place-items:center;box-shadow:0 8px 28px #0006;transition:transform .15s}
.watch-player:hover .watch-big-play{transform:scale(1.05)}
.watch-soon{position:absolute;bottom:18px;left:0;right:0;text-align:center;font-size:12px;color:#ccc;margin:0}
.watch-controls{padding:10px 14px 14px;background:#111}
.watch-scrub{height:4px;background:#3f3f3f;border-radius:99px;overflow:hidden;margin-bottom:10px}
.watch-scrub span{display:block;width:8%;height:100%;background:var(--green);border-radius:99px}
.watch-controls-row{display:flex;align-items:center;gap:12px;color:#ddd}
.watch-controls-spacer{flex:1}
.watch-meta{padding:18px 2px 0}
.watch-meta h1{font-size:22px;letter-spacing:-.6px}
.watch-meta p{margin-top:8px;font-size:13px}
.watch-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.content-reaction-bar{display:flex;flex-wrap:wrap;align-items:center;gap:10px;margin-top:14px;padding-top:14px;border-top:1px solid var(--line)}
.content-reaction-label{font-size:13px;font-weight:650;color:var(--muted);margin-right:4px}
.content-reaction-btn{min-height:36px;padding:8px 12px;font-size:12px}
.content-reaction-btn.active.like{border-color:var(--green);background:var(--green-soft);color:var(--green);font-weight:700}
.content-reaction-btn.active.dislike{border-color:#c45c4a;background:#f8e8e4;color:#9a3f30;font-weight:700}
.content-reaction-form .content-reaction-chips{margin-top:4px}
[data-theme=dark] .content-reaction-btn.active.dislike{border-color:#e08a78;background:#3a1d18;color:#f2c4b9}
.watch-related{position:sticky;top:90px}
.up-next-list{display:flex;flex-direction:column;gap:10px}
.up-next-item{display:flex;gap:12px;align-items:center;padding:10px;border-radius:10px;border:1px solid var(--line);background:var(--surface)}
.up-next-item:hover{background:var(--subtle)}
.up-next-thumb{width:72px;aspect-ratio:16/9;border-radius:8px;background:var(--art-bg,var(--subtle));color:var(--art-ink,var(--muted));display:grid;place-items:center;flex-shrink:0}
.up-next-item b{display:block;font-size:13px;color:var(--ink)}
.up-next-item span{font-size:11px;color:var(--muted)}
.video-lesson-row{width:100%;cursor:pointer;font:inherit;color:inherit;text-align:left;background:transparent}
.video-lesson-row .video-lesson-icon{display:grid;place-items:center;width:28px;color:var(--green);flex-shrink:0}
.video-lesson-row.is-locked .video-lesson-icon,.video-lesson-row.is-editing .video-lesson-icon{color:var(--muted)}
.video-lesson-row h3{font-size:13px;margin:0}
.video-lesson-row p{margin:2px 0 0}
.watch-embed,.watch-player-live{border-radius:14px;overflow:hidden;background:#0a0a0a;aspect-ratio:16/9}
.watch-embed iframe,.watch-video{width:100%;height:100%;border:0;display:block;background:#000}
.feedback-message{resize:vertical;min-height:110px;line-height:1.5}
.feedback-error{margin:0 0 12px;padding:10px 12px;border-radius:10px;background:#fde8e8;color:#8a1f1f;border:1px solid #f0b4b4;font-size:13px;line-height:1.45}
[data-theme="dark"] .feedback-error,.dark .feedback-error{background:#3a1a1a;color:#ffb4b4;border-color:#6a3030}
.video-card{border:0;background:transparent;padding:0;text-align:left;cursor:pointer;font:inherit;width:100%}
.video-card.is-locked .video-thumb{filter:saturate(.85)}
.watch-volume{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:12px;padding:10px 12px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}
.watch-volume-label{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:650;color:var(--ink)}
.watch-volume-chips{display:flex;gap:6px;flex-wrap:wrap}
.watch-promo-banner{display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap;margin-top:12px;padding:14px 16px;border-radius:14px;border:1px solid var(--line);background:linear-gradient(135deg,var(--green-soft),var(--surface))}
.watch-promo-banner b{display:block;font-size:14px;margin-bottom:4px}
.watch-promo-banner p{margin:0;font-size:13px;color:var(--muted);max-width:42ch}
.module-reader{display:grid;gap:14px}
.module-reader-head{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:flex-start}
.module-reader-head h1{margin:6px 0 6px;font-size:clamp(1.35rem,2.5vw,1.85rem);max-width:36ch}
.module-frame{border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#0a0a0a;min-height:70vh}
.module-frame iframe{width:100%;height:75vh;border:0;display:block;background:#0a0a0a}
.module-reader.is-fill{position:fixed;inset:0;z-index:80;gap:0;background:var(--bg);padding:0;margin:0}
.module-reader.is-fill .module-reader-head{padding:10px 14px;margin:0;border-bottom:1px solid var(--line);background:var(--surface);align-items:center}
.module-reader.is-fill .module-reader-head h1{font-size:1rem;max-width:none;margin:0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.module-reader.is-fill .module-reader-head .eyebrow,.module-reader.is-fill .module-reader-head p{display:none}
.module-reader.is-fill .module-frame{border:0;border-radius:0;min-height:0;height:calc(100dvh - 58px)}
.module-reader.is-fill .module-frame iframe{height:100%}
body.module-fill-active .workspace{overflow:hidden}
body.module-fill-active .sidebar,body.module-fill-active .topbar,body.module-fill-active .drawer-backdrop{visibility:hidden}
button.up-next-item{width:100%;cursor:pointer;font:inherit;color:inherit;text-align:left}

/* Exam simulation tabs + full papers */
.exam-mode-tabs{display:flex;gap:8px;margin:0 0 18px;padding:4px;border:1px solid var(--line);border-radius:12px;background:var(--subtle);width:fit-content;max-width:100%}
.exam-mode-tab{border:0;background:transparent;color:var(--muted);padding:10px 16px;border-radius:9px;font:650 13px Manrope,system-ui,sans-serif;cursor:pointer}
.exam-mode-tab.active{background:var(--surface);color:var(--ink);box-shadow:0 1px 3px #00000012}
.paper-marks-hero{display:flex;align-items:baseline;gap:10px;margin:12px 0 16px}
.paper-marks-hero b{font:800 42px/1 Manrope,system-ui,sans-serif;color:var(--green)}
.paper-parts-list{list-style:none;margin:0 0 8px;padding:0;display:flex;flex-direction:column;gap:8px}
.paper-parts-list li{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--subtle);font-size:13px}
.paper-parts-list span{color:var(--muted);font-size:12px}
.paper-step-dots{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px}
.paper-step-dots .question-dot{width:100%;min-width:0;aspect-ratio:1;height:auto;padding:0;font-size:11px}
.tf-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.tf-answer{justify-content:center;font-weight:700}
.fill-blanks{display:flex;flex-direction:column;gap:12px;margin-top:8px}
.fill-field{display:flex;flex-direction:column;gap:6px}
.paper-textarea{width:100%;min-height:120px;resize:vertical;font:inherit}
.match-hint{font-size:13px;color:var(--muted);margin:0 0 14px}
.match-board{position:relative;display:grid;grid-template-columns:1fr 1fr;gap:28px;isolation:isolate}
.match-lines{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:1;overflow:visible}
.match-line{fill:none;stroke:var(--green);stroke-width:2.5;stroke-linecap:round;opacity:.85}
.match-line-live{stroke-dasharray:6 6;opacity:.7;animation:match-dash .8s linear infinite}
@keyframes match-dash{to{stroke-dashoffset:-24}}
.match-col{position:relative;z-index:2;display:flex;flex-direction:column;gap:8px;min-width:0}
.match-col-label{font:700 11px Manrope,system-ui,sans-serif;color:var(--muted);letter-spacing:.4px;text-transform:uppercase;margin-bottom:2px}
.match-left,.match-right{position:relative;display:flex;align-items:center;gap:10px;width:100%;text-align:left;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:12px;padding:12px 12px;min-height:52px;cursor:grab;user-select:none}
.match-right{cursor:pointer}
.match-left:hover,.match-right:hover{background:var(--subtle)}
.match-left.dragging,.match-left.dragging-ready{opacity:.55;cursor:grabbing;border-style:dashed;transform:scale(.98)}
.match-left.picked{border-color:var(--green);box-shadow:0 0 0 2px var(--green);background:var(--green-soft);z-index:3}
.match-left.paired,.match-right.used{border-color:var(--green);background:var(--green-soft)}
.match-board.is-picking .match-right.drop-target,.match-right.drop-target{border-style:dashed;border-color:var(--green)}
.match-right.drag-over{border-color:var(--green);border-style:solid;background:var(--green-soft);box-shadow:0 0 0 2px var(--green);transform:scale(1.02)}
.match-anchor{position:absolute;width:10px;height:10px;border-radius:50%;background:var(--green);border:2px solid var(--surface);box-shadow:0 0 0 1px var(--green);pointer-events:none;z-index:4}
.match-anchor-left{right:-5px;top:50%;transform:translateY(-50%)}
.match-anchor-right{left:-5px;top:50%;transform:translateY(-50%)}
.match-grip{flex-shrink:0;color:var(--muted);font-size:12px;letter-spacing:-2px;line-height:1}
.match-num,.match-badge{flex-shrink:0;font:700 12px Manrope,system-ui,sans-serif;color:var(--green)}
.match-text{flex:1;font-size:13px;line-height:1.35}
.match-ghost{position:fixed;left:0;top:0;z-index:500;pointer-events:none;max-width:240px;padding:10px 14px;border-radius:12px;background:var(--surface);border:2px solid var(--green);box-shadow:0 12px 28px #00000033;color:var(--ink);font:650 13px Manrope,system-ui,sans-serif;will-change:transform}
body.match-dragging{cursor:grabbing}
body.match-dragging .match-right{cursor:copy}
.part-score-list{display:flex;flex-direction:column;gap:8px;margin:16px 0;text-align:left}
.part-score-row{display:flex;justify-content:space-between;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:13px}
.paper-part-jump{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;padding:8px 10px;font-size:12px;max-width:220px}
@media(max-width:700px){
 .match-board{grid-template-columns:1fr}
 .exam-mode-tabs{width:100%}
 .exam-mode-tab{flex:1}
}

/* App-like quiz picker */
.quiz-section-head{align-items:center;gap:12px;flex-wrap:wrap}
.quiz-toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-left:auto}
.quiz-search{min-width:180px;flex:1}
.quiz-course-select{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:8px;padding:9px 12px;font-size:12px;min-height:38px;max-width:220px}
.quiz-course-list{display:flex;flex-direction:column;gap:12px}
.quiz-course{padding:0;overflow:hidden}
.quiz-course-head{display:flex;align-items:center;gap:12px;width:100%;padding:16px 18px;border:0;background:transparent;color:var(--ink);text-align:left;cursor:pointer}
.quiz-course-head:hover{background:var(--subtle)}
.quiz-course-title{flex:1;font:650 15px Manrope,system-ui,sans-serif}
.quiz-course-head svg{color:var(--muted);transition:transform .18s ease;flex-shrink:0}
.quiz-course.is-open .quiz-course-head svg{transform:rotate(90deg)}
.quiz-course-body{border-top:1px solid var(--line);padding:4px 10px 10px}
.quiz-chapter-row{display:grid;grid-template-columns:minmax(0,1fr) auto auto;align-items:center;gap:12px;padding:14px 10px;border-radius:10px}
.quiz-chapter-row:hover{background:var(--subtle)}
.quiz-chapter-row h3{margin:0;font:650 14px Manrope,system-ui,sans-serif}
.quiz-chapter-row p{margin:4px 0 0;font-size:12px;color:var(--muted)}
.quiz-chapter-row.is-locked{opacity:.92}
.quiz-chapter-row .tag{justify-self:end}
.module-file-actions{justify-self:end;flex-shrink:0}
.module-file-actions .btn{white-space:nowrap}
.quiz-config .field-label{display:block;margin:14px 0 8px;font-size:12px;font-weight:650;color:var(--muted)}
.quiz-chip-row{display:flex;flex-wrap:wrap;gap:8px}
.quiz-chip{border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:999px;padding:8px 12px;font-size:12px;min-height:34px}
.quiz-chip:hover{background:var(--subtle)}
.quiz-chip.active{border-color:var(--green);background:var(--green-soft);color:var(--green);font-weight:650}

/* Exam polish */
.session-chrome{margin-bottom:18px}
.session-chrome .progress-track{margin-top:14px}
.exam-layout.has-rail{display:grid;grid-template-columns:minmax(0,1fr) minmax(200px,220px);gap:18px;align-items:start}
.exam-rail{position:sticky;top:90px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:14px;box-shadow:var(--shadow);min-width:0;overflow:hidden}
.exam-rail-head{display:flex;flex-direction:column;gap:4px;margin-bottom:14px}
.exam-rail-head b{font-size:13px}
.exam-dots{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;width:100%}
.exam-dots .question-dot{width:100%;min-width:0;aspect-ratio:1;height:auto;padding:0;font-size:11px}
.exam-dots-mobile{display:none;flex-wrap:wrap;gap:6px}
.exam-dots-mobile .question-dot{width:32px;height:32px;flex:0 0 auto}
.exam-submit[hidden]{display:none!important}
.exam-submit{width:100%;margin-top:16px}
.exam-finish{box-shadow:0 0 0 1px var(--green)}
.key-hint{display:inline-grid;place-items:center;min-width:22px;height:18px;margin-left:4px;padding:0 5px;border:1px solid currentColor;border-radius:4px;font:600 10px/1 ui-monospace,Consolas,monospace;opacity:.7}
.answer{min-height:52px;padding:16px 18px;font-size:14px}
.answer.selected:not(.incorrect):not(.correct){border-color:var(--green);background:var(--green-soft);box-shadow:0 0 0 1px var(--green)}
.answer.incorrect,.answer.selected.incorrect{border-color:#d8a296;background:#fcf0ec;color:#974b3c;box-shadow:none}
.answer.correct,.answer.selected.correct{border-color:#519a70;background:#eef8f0;color:#27603e;box-shadow:none}
.timer-badge.urgent,.session-chrome.exam-urgent .timer-badge{background:#fcf0ec;border-color:#e2b4a8;color:#974b3c;animation:pulse-urgent 1.2s ease-in-out infinite}
@keyframes pulse-urgent{50%{opacity:.75}}
body.exam-focus .sidebar{opacity:.55;filter:saturate(.7)}
body.exam-focus .sidebar:hover,body.exam-focus .sidebar:focus-within{opacity:1;filter:none}
.score-ring{width:72px;height:72px;border-radius:50%;margin:0 auto 12px;display:grid;place-items:center;background:conic-gradient(var(--green) calc(var(--pct)*1%),var(--line) 0);position:relative}
.score-ring:before{content:'';position:absolute;inset:6px;border-radius:50%;background:var(--surface)}
.score-ring span{position:relative;font:750 16px Manrope;color:var(--ink)}
.review-item.is-correct .review-status{color:var(--green)}
.review-item.is-wrong .review-status{color:#b77861}
.review-panel .review-item{padding:18px 4px}

/* Context menu */
.context-menu{position:fixed;z-index:400;min-width:210px;padding:6px;border-radius:10px;background:var(--surface);border:1px solid var(--line);box-shadow:0 12px 40px #00000022}
.context-item{display:flex;align-items:center;gap:10px;width:100%;border:0;background:transparent;color:var(--ink);padding:10px 12px;border-radius:8px;font-size:13px;text-align:left}
.context-item:hover,.context-item:focus-visible{background:var(--subtle);outline:none}
.context-item span{flex:1}

/* Fullscreen */
body.is-fullscreen .workspace-label,html:fullscreen .workspace-label{display:none}
html:fullscreen,html:-webkit-full-screen{background:var(--bg)}
html:fullscreen .workspace,html:-webkit-full-screen .workspace{min-height:100dvh}
html:fullscreen .content,html:-webkit-full-screen .content{max-width:1600px}

@media(max-width:1000px){
 .watch-layout{grid-template-columns:1fr}
 .watch-related{position:static}
 .exam-layout.has-rail{grid-template-columns:1fr}
 .exam-rail{display:none}
 .exam-dots-mobile{display:flex}
}
@media(max-width:760px){
 .video-grid{grid-template-columns:1fr 1fr;gap:12px}
 .watch-meta h1{font-size:18px}
 .watch-big-play{width:56px;height:56px}
 body.exam-focus .sidebar{opacity:1;filter:none}
}
@media(max-width:640px){
 .quiz-chapter-row{grid-template-columns:minmax(0,1fr) auto;gap:10px}
 .quiz-chapter-row .tag{grid-column:2;grid-row:1;justify-self:end;align-self:start}
 .module-file-actions{grid-column:1 / -1;justify-self:stretch}
 .module-file-actions .btn{flex:1;justify-content:center}
}
@media(max-width:440px){
 .video-grid{grid-template-columns:1fr}
 .quiz-chapter-row{grid-template-columns:1fr;gap:8px}
 .quiz-chapter-row .tag{grid-column:auto;grid-row:auto;justify-self:start}
 .module-file-actions{grid-column:auto}
 .quiz-chapter-row .tag,.quiz-chapter-row .btn{justify-self:start}
 .quiz-section-head{flex-direction:column;align-items:stretch}
 .quiz-toolbar{margin-left:0;width:100%}
 .quiz-course-select{max-width:none;flex:1}
}
.auth-login-btn{min-height:34px;padding:7px 12px;font-size:11px;text-decoration:none}
.start-home{display:flex;flex-direction:column;gap:18px}
.start-home-top{display:flex;align-items:center;justify-content:space-between;gap:16px 24px}
.start-home h1{margin:0;font:650 18px/1.35 Manrope,system-ui,sans-serif;letter-spacing:-.3px;color:var(--muted)}
.start-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px}
.start-tile{display:flex;flex-direction:column;align-items:flex-start;gap:18px;min-height:168px;padding:22px;border:1px solid var(--line);border-radius:16px;background:var(--surface);color:var(--ink)}
.start-tile:hover{border-color:var(--green);background:var(--green-soft)}
.start-tile-mark{width:46px;height:46px;border-radius:14px;display:grid;place-items:center;flex-shrink:0;background:var(--green-soft);color:var(--green)}
.start-tile:hover .start-tile-mark{background:var(--surface)}
.start-tile h2{margin:0 0 4px;font-size:22px;letter-spacing:-.4px}
.start-tile p{margin:0;font-size:13px;color:var(--muted)}
.start-min-search{display:flex;align-items:center;gap:10px;width:min(320px,100%);flex-shrink:0;margin:0;padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:var(--surface);color:var(--muted);font:inherit;font-size:13px;text-align:left;cursor:pointer}
.start-min-search:hover{border-color:var(--green);color:var(--ink)}
.start-min-search span{flex:1}
.start-min-search kbd{font:650 11px ui-monospace,monospace;border:1px solid var(--line);border-bottom-width:2px;border-radius:6px;padding:3px 6px;color:var(--muted);background:var(--subtle)}
@media(max-width:980px){.start-grid{grid-template-columns:1fr 1fr}}
@media(max-width:640px){.start-home-top{flex-direction:column;align-items:stretch}.start-min-search{width:100%}.start-grid{grid-template-columns:1fr}.start-tile{min-height:88px;padding:16px 18px}}
.site-footer{max-width:1440px;margin:0 auto;padding:8px 38px 28px;color:var(--muted);font-size:12px;line-height:1.6}
.site-footer a{color:var(--green);font-weight:650}
.site-footer p{margin:0 0 4px}
.quiz-chapter-row.is-gap{opacity:.8}
.module-phone-note{display:none;margin:0 0 12px;padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:var(--subtle);font-size:13px}
.watch-player-live{position:relative;min-height:220px;background:#111}
@media(max-width:760px){
 .search-trigger kbd,[data-action="toggle-fullscreen"]{display:none}
 .module-frame{display:none}
 .module-phone-note{display:block}
 .site-footer{padding:8px 18px 24px}
 .search-trigger{width:auto;min-width:0}
 .start-min-search kbd{display:none}
}

/* Flashcard ratings (Again / Hard / Good / Easy) */
.flash-rate-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;width:100%;max-width:640px;margin:0 auto}
.flash-rate{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;min-height:52px;padding:10px 6px;border:1px solid var(--line);border-radius:12px;background:var(--surface);color:var(--ink);cursor:pointer;font:inherit;transition:background .15s,border-color .15s,transform .12s}
.flash-rate:hover:not(:disabled){transform:translateY(-1px)}
.flash-rate:disabled{opacity:.4;cursor:not-allowed}
.flash-rate b{font:750 13px Manrope,system-ui,sans-serif}
.flash-rate span{font-size:10px;color:var(--muted)}
.flash-rate.again{border-color:#e8b4b0;color:#b23b2f}
.flash-rate.again:hover:not(:disabled){background:#fdf1ef}
.flash-rate.hard{border-color:#efc89a;color:#c46b1a}
.flash-rate.hard:hover:not(:disabled){background:#fef6eb}
.flash-rate.good{border-color:#9fc8e8;color:#1f6f9c}
.flash-rate.good:hover:not(:disabled){background:#eef7fc}
.flash-rate.easy{border-color:#9fd0b0;color:#1f7a45}
.flash-rate.easy:hover:not(:disabled){background:#eef8f1}
.flash-rate-summary{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin:0 0 18px}
.flash-rate-summary span{font:650 12px Manrope,system-ui,sans-serif;padding:6px 10px;border-radius:999px;background:var(--subtle);color:var(--muted)}
.flash-rate-summary .again{color:#b23b2f;background:#fdf1ef}
.flash-rate-summary .hard{color:#c46b1a;background:#fef6eb}
.flash-rate-summary .good{color:#1f6f9c;background:#eef7fc}
.flash-rate-summary .easy{color:#1f7a45;background:#eef8f1}
[data-theme=dark] .flash-rate.again:hover:not(:disabled){background:#3a1d18}
[data-theme=dark] .flash-rate.hard:hover:not(:disabled){background:#3a2a18}
[data-theme=dark] .flash-rate.good:hover:not(:disabled){background:#163040}
[data-theme=dark] .flash-rate.easy:hover:not(:disabled){background:#163528}
[data-theme=dark] .flash-rate-summary .again{background:#3a1d18;color:#f2c4b9}
[data-theme=dark] .flash-rate-summary .hard{background:#3a2a18;color:#f0d0a8}
[data-theme=dark] .flash-rate-summary .good{background:#163040;color:#a8d4f0}
[data-theme=dark] .flash-rate-summary .easy{background:#163528;color:#b8f0d0}
@media(max-width:520px){.flash-rate-row{gap:6px}.flash-rate{min-height:48px;padding:8px 4px}.flash-rate b{font-size:12px}.flash-rate span{font-size:9px}}

/* Flashcard 3D flip */
.flash-heading-actions{display:flex;align-items:center;gap:10px;flex-shrink:0}
.flash-focus-toggle{white-space:nowrap}
.flash-focus-bar{display:flex;justify-content:flex-end;width:100%;max-width:640px;margin:0 auto 8px}
.module-list-tabs{margin-bottom:18px}
.session-wrap.flash-session.is-focus{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:calc(100dvh - 48px);padding:24px 16px;box-sizing:border-box}
.session-wrap.flash-session.is-focus .flashcard-scene{margin:0 0 20px;flex:0 1 auto}
.session-wrap.flash-session.is-focus .flash-rate-row{margin:0}
body.flash-focus .sidebar,body.flash-focus .topbar,body.flash-focus .drawer-backdrop{display:none}
body.flash-focus .workspace{margin-left:0;min-height:100dvh}
body.flash-focus .content{padding:16px;max-width:720px;margin:0 auto}
.flashcard-scene{perspective:1400px;margin:8px 0 18px;width:100%;max-width:640px}
.flashcard-inner{position:relative;display:block;width:100%;min-height:280px;padding:0;border:0;background:transparent;cursor:pointer;font:inherit;color:inherit;text-align:left;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.2,.8,.2,1);border-radius:18px}
.flashcard-inner.is-flipped{transform:rotateY(180deg)}
.flashcard-face{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;gap:12px;padding:28px 26px;border:1px solid var(--line);border-radius:18px;background:var(--surface);box-shadow:0 10px 30px #15322514;backface-visibility:hidden;-webkit-backface-visibility:hidden}
.flashcard-face .eyebrow{font-size:10px;letter-spacing:1.4px;color:var(--muted);font-weight:700}
.flashcard-face h2{font-size:22px;line-height:1.35;letter-spacing:-.4px;margin:0}
.flashcard-face p{margin:0;font-size:13px;color:var(--muted)}
.flashcard-front{transform:rotateY(0deg)}
.flashcard-back{transform:rotateY(180deg);background:linear-gradient(165deg,var(--green-soft),var(--surface));border-color:#c5ddcf}
.flashcard-inner:focus-visible{outline:3px solid #66ae8f;outline-offset:4px}
.flashcard-inner:hover .flashcard-face{border-color:#b7cec0}
@media(prefers-reduced-motion:reduce){.flashcard-inner{transition:none}}
@media(max-width:520px){.flashcard-inner{min-height:240px}.flashcard-face{padding:22px 18px}.flashcard-face h2{font-size:18px}}