:root{--bg:#070a10;--panel:#0d121c;--line:rgba(255,255,255,.09);--text:#f4f7fb;--muted:#8c9aae;--accent:#8ea5ff;--danger:#ff7b87}*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 15% 0,rgba(94,118,220,.13),transparent 28rem),var(--bg);color:var(--text);font-family:"DM Sans",sans-serif}.modules-topbar{height:78px;padding:0 clamp(18px,4vw,58px);display:grid;grid-template-columns:1fr auto 1fr;align-items:center;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20;background:rgba(7,10,16,.88);backdrop-filter:blur(18px)}.brand{color:white;text-decoration:none;font-family:Manrope;font-size:26px;font-weight:900;letter-spacing:-.05em}.top-copy{text-align:center}.top-copy span,.top-copy strong{display:block}.top-copy span,.eyebrow{font-size:9px;letter-spacing:.16em;font-weight:900;color:#8096ee}.top-copy strong{margin-top:3px}.top-actions{justify-self:end;display:flex;gap:10px;align-items:center}.top-actions a,.top-actions button,.teacher-only{border:1px solid var(--line);background:rgba(255,255,255,.025);color:#c8d1df;text-decoration:none;padding:10px 13px;border-radius:10px;font:inherit;font-size:12px;cursor:pointer}.modules-shell{width:min(1280px,calc(100% - 36px));margin:auto;padding:56px 0 100px}.loading-screen{min-height:60vh;display:grid;place-items:center;text-align:center;align-content:center}#loadingScreen[hidden]{display:none!important}.loader-orb{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;border:1px solid var(--line);background:#101726;font-family:Manrope;font-weight:900}.loading-screen h1{font:800 42px Manrope;margin:20px 0 5px}.loading-screen p{color:var(--muted)}.library-hero{display:grid;grid-template-columns:minmax(0,1fr) 220px;gap:50px;align-items:end;padding:22px 0 42px}.library-hero h1{max-width:850px;margin:10px 0 14px;font:800 clamp(42px,6vw,78px)/.96 Manrope;letter-spacing:-.055em}.library-hero p:not(.eyebrow){max-width:760px;color:#96a4b8;font-size:17px;line-height:1.65}.hero-stat{border:1px solid var(--line);border-radius:24px;padding:25px;background:linear-gradient(140deg,rgba(142,165,255,.08),rgba(255,255,255,.015))}.hero-stat span,.hero-stat strong,.hero-stat small{display:block}.hero-stat span{font-size:9px;font-weight:900;letter-spacing:.14em;color:#8299f8}.hero-stat strong{font:800 54px Manrope;margin:8px 0}.hero-stat small{color:var(--muted)}.filter-row{display:flex;gap:8px;align-items:center;margin-bottom:20px}.filter-row button{border:1px solid var(--line);background:transparent;color:#8997aa;border-radius:999px;padding:9px 14px;cursor:pointer}.filter-row button.active{background:#e8edf7;color:#0a0e16}.filter-row span{margin-left:auto;color:#91a4ff;font-size:11px}.module-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.module-card{padding:25px;border:1px solid var(--line);border-radius:24px;background:linear-gradient(145deg,rgba(255,255,255,.035),rgba(255,255,255,.012));cursor:pointer;transition:.2s ease;position:relative;overflow:hidden}.module-card:hover{transform:scale(1.012);border-color:rgba(142,165,255,.28);background:linear-gradient(145deg,rgba(142,165,255,.08),rgba(255,255,255,.018))}.module-card-top{display:flex;justify-content:space-between;gap:15px}.module-card-top span{font-size:9px;letter-spacing:.14em;font-weight:900;color:#8599e8}.module-card-top b{font-size:10px;color:#667389}.module-card h2{font:800 28px Manrope;margin:28px 0 8px;letter-spacing:-.035em}.module-card p{color:#8f9db0;line-height:1.55}.tag-row{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.tag-row span{padding:6px 9px;border-radius:999px;border:1px solid var(--line);color:#7f8da2;font-size:10px}.module-card-foot{display:flex;justify-content:space-between;align-items:center;margin-top:24px;padding-top:16px;border-top:1px solid var(--line);font-size:11px;color:#78869a}.back-button{border:0;background:transparent;color:#8fa5ff;font:700 13px inherit;cursor:pointer;padding:0 0 20px}.reader-hero{display:grid;grid-template-columns:1fr auto;gap:30px;padding:14px 0 35px;border-bottom:1px solid var(--line)}.reader-hero h1{font:800 clamp(42px,6vw,76px)/.98 Manrope;letter-spacing:-.055em;margin:8px 0 12px}.reader-hero p{color:#95a3b6;max-width:800px;line-height:1.6}.reader-actions{display:flex;gap:9px;align-items:start}.reader-actions span,.reader-actions button{border:1px solid var(--line);border-radius:12px;padding:10px 13px;background:rgba(255,255,255,.025);color:#adb8c8}.reader-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:24px;margin-top:28px}.markdown-card,.resource-block{border:1px solid var(--line);border-radius:24px;background:rgba(255,255,255,.02)}.markdown-card{padding:clamp(24px,4vw,50px)}.markdown-body{color:#d8dfeb;line-height:1.75;font-size:16px}.markdown-body h1,.markdown-body h2,.markdown-body h3{font-family:Manrope;color:#fff;letter-spacing:-.03em}.markdown-body h1{font-size:38px}.markdown-body h2{font-size:27px;margin-top:38px}.markdown-body h3{font-size:20px;margin-top:27px}.markdown-body p,.markdown-body li{color:#b1bdcc}.markdown-body strong{color:#f8fbff}.markdown-body blockquote{margin:28px 0;padding:18px 20px;border-left:3px solid #8199fa;background:rgba(129,153,250,.07);border-radius:0 14px 14px 0}.markdown-body table{width:100%;border-collapse:collapse;margin:20px 0}.markdown-body td,.markdown-body th{border:1px solid var(--line);padding:10px;text-align:left}.resource-sidebar{display:flex;flex-direction:column;gap:14px}.resource-block{padding:20px}.resource-block>span{font-size:9px;letter-spacing:.14em;font-weight:900;color:#8297f2}.resource-item{display:block;text-decoration:none;color:#dbe3ee;margin-top:12px;padding:14px;border:1px solid var(--line);border-radius:14px;background:rgba(255,255,255,.02)}.resource-item strong,.resource-item small{display:block}.resource-item small{color:#748399;margin-top:4px}.video-frame{margin-top:12px;aspect-ratio:16/9;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#05070c}.video-frame iframe,.video-frame video{width:100%;height:100%;border:0}.empty-resource{color:#69778b;font-size:13px;margin-top:12px}.editor-dialog{width:min(1180px,calc(100% - 30px));max-height:94vh;padding:0;border:1px solid rgba(255,255,255,.13);border-radius:26px;background:#0a0f18;color:#fff;box-shadow:0 40px 120px #000}.editor-dialog::backdrop{background:rgba(0,0,0,.78);backdrop-filter:blur(5px)}#editorForm{padding:25px}.editor-head{display:flex;justify-content:space-between;align-items:center;padding-bottom:20px;border-bottom:1px solid var(--line)}.editor-head span,.editor-label span,.pdf-uploader span{font-size:9px;letter-spacing:.14em;color:#8298f6;font-weight:900}.editor-head h2{margin:5px 0 0;font:800 30px Manrope}.icon-button{border:1px solid var(--line);background:transparent;color:#fff;border-radius:50%;width:38px;height:38px;font-size:22px;cursor:pointer}.editor-grid{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin-top:20px}.editor-grid label{display:flex;flex-direction:column;gap:7px;color:#8f9cae;font-size:12px}.editor-grid input,.editor-grid textarea,.editor-grid select,.editor-pane textarea{border:1px solid var(--line);background:#080d15;color:#eef3fa;border-radius:11px;padding:12px;font:14px inherit}.span-2{grid-column:1/-1}.check-label{flex-direction:row!important;align-items:center}.markdown-editor-shell{display:grid;grid-template-columns:1fr 1fr;min-height:420px;margin-top:18px;border:1px solid var(--line);border-radius:18px;overflow:hidden}.editor-pane,.preview-pane{padding:16px}.editor-pane{border-right:1px solid var(--line)}.editor-label{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.editor-label small{color:#657286}.editor-pane textarea{width:100%;height:360px;resize:vertical;line-height:1.6}.preview-pane{overflow:auto;max-height:430px;background:rgba(255,255,255,.012)}.pdf-uploader{display:grid;grid-template-columns:1fr auto;gap:16px;align-items:center;margin-top:18px;padding:18px;border:1px solid var(--line);border-radius:16px}.pdf-uploader strong,.pdf-uploader small{display:block;margin-top:4px}.pdf-uploader small{color:#68768a}.upload-button,.primary-button,.secondary-button,.danger-button{border:1px solid var(--line);border-radius:11px;padding:11px 15px;cursor:pointer;font:700 12px inherit}.upload-button,.primary-button{background:#e9eef8;color:#080c13}.secondary-button{background:transparent;color:#c0cad7}.danger-button{background:rgba(255,83,101,.08);color:#ff98a2;border-color:rgba(255,83,101,.22)}.editor-pdf-list{grid-column:1/-1;display:flex;flex-wrap:wrap;gap:7px}.editor-pdf-chip{border:1px solid var(--line);border-radius:999px;padding:7px 10px;color:#9facbd;font-size:11px}.editor-footer{display:flex;gap:10px;align-items:center;margin-top:18px}.editor-footer #editorStatus{margin-left:auto;color:#8997aa;font-size:12px}@media(max-width:850px){.modules-topbar{grid-template-columns:1fr auto}.top-copy{display:none}.library-hero,.reader-layout{grid-template-columns:1fr}.hero-stat{width:200px}.module-grid{grid-template-columns:1fr}.reader-hero{grid-template-columns:1fr}.markdown-editor-shell{grid-template-columns:1fr}.editor-pane{border-right:0;border-bottom:1px solid var(--line)}.editor-grid{grid-template-columns:1fr}.span-2{grid-column:auto}}@media(max-width:580px){.top-actions a{display:none}.modules-shell{width:min(100% - 22px,1280px);padding-top:35px}.library-hero h1{font-size:46px}.filter-row{overflow:auto}.reader-hero h1{font-size:45px}.pdf-uploader{grid-template-columns:1fr}.editor-footer{flex-wrap:wrap}.editor-footer #editorStatus{width:100%;order:-1;margin:0}}
/* Embedded lesson media + side-by-side PDF study mode */
.field-help{display:block;color:#66758a;font-size:11px;line-height:1.5;margin-top:2px}.field-help b{color:#aab8ff}.marker-toolbar{display:flex;align-items:center;gap:7px;flex-wrap:wrap;margin:0 0 10px}.marker-toolbar span{font-size:10px;color:#6e7d91;font-weight:700}.marker-toolbar button{border:1px solid var(--line);border-radius:8px;background:rgba(142,165,255,.06);color:#9eafff;padding:6px 9px;font:700 10px inherit;cursor:pointer}.marker-toolbar button:hover{background:rgba(142,165,255,.12);border-color:rgba(142,165,255,.28)}
.inline-video-block,.auto-video-section{margin:28px 0}.auto-video-section{padding-bottom:8px;border-bottom:1px solid var(--line)}.auto-video-section>.video-frame+.video-frame{margin-top:14px}.inline-video-label{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:9px}.inline-video-label span{font-size:9px;letter-spacing:.15em;font-weight:900;color:#8297f2}.inline-video-label small{color:#65758a;font-size:10px;text-align:right}.video-frame{width:100%;margin-top:0;aspect-ratio:16/9;border:1px solid rgba(255,255,255,.11);border-radius:18px;overflow:hidden;background:#03050a}.video-frame iframe,.video-frame video{display:block;width:100%;height:100%;border:0;background:#000}.video-error{display:flex;flex-direction:column;gap:7px;margin-top:8px;padding:16px;border:1px dashed rgba(255,255,255,.12);border-radius:14px;color:#8896aa;background:rgba(255,255,255,.018);font-size:12px}.video-error strong{color:#d7deea}.video-error a{color:#92a6ff;text-decoration:none}
.pdf-side-panel{position:sticky;top:101px;align-self:start;min-width:0;border:1px solid var(--line);border-radius:24px;background:rgba(255,255,255,.02);overflow:hidden}.pdf-panel-head{display:flex;justify-content:space-between;gap:12px;align-items:center;padding:17px 18px;border-bottom:1px solid var(--line)}.pdf-panel-head>div{min-width:0}.pdf-panel-head span,.pdf-empty>span{display:block;font-size:9px;letter-spacing:.14em;font-weight:900;color:#8297f2}.pdf-panel-head strong{display:block;margin-top:4px;color:#e5ebf5;font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:210px}.pdf-panel-head a{flex:0 0 auto;text-decoration:none;color:#aab8ff;font-size:11px;border:1px solid var(--line);border-radius:9px;padding:7px 9px}.pdf-tabs{display:flex;gap:6px;padding:10px 12px 0}.pdf-tabs button{width:29px;height:29px;border:1px solid var(--line);border-radius:8px;background:transparent;color:#718096;cursor:pointer;font:700 10px inherit}.pdf-tabs button.active{background:#e8edf7;color:#0a0e16}.pdf-viewer-shell{height:min(72vh,760px);min-height:520px;margin:12px;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:#fff}.pdf-viewer-shell iframe{display:block;width:100%;height:100%;border:0;background:#fff}.pdf-help{margin:0;padding:0 16px 15px;color:#647287;font-size:10px;line-height:1.45}.pdf-empty{padding:22px}.pdf-empty strong{display:block;margin-top:9px;color:#cfd7e4}.pdf-empty p{margin:7px 0 0;color:#6f7e92;font-size:12px;line-height:1.5}
@media(max-width:1000px){.reader-layout{grid-template-columns:minmax(0,1fr) 38%}.pdf-viewer-shell{min-height:440px}}
@media(max-width:850px){.pdf-side-panel{position:relative;top:auto}.pdf-viewer-shell{height:600px;min-height:0}.inline-video-label{align-items:flex-start;flex-direction:column;gap:3px}.inline-video-label small{text-align:left}}
@media(max-width:580px){.pdf-viewer-shell{height:480px;margin:9px}.pdf-panel-head strong{max-width:170px}.marker-toolbar{gap:5px}}

.reader-layout{grid-template-columns:minmax(0,1fr) minmax(340px,420px);align-items:start}
@media(max-width:1000px){.reader-layout{grid-template-columns:minmax(0,1fr) minmax(320px,38%)}}
@media(max-width:850px){.reader-layout{grid-template-columns:1fr}}

/* Subject color system — Reading & Writing vs Math */
.subject-rw{
  --subject:#9d8cff;
  --subject-bright:#c0b6ff;
  --subject-soft:rgba(157,140,255,.10);
  --subject-soft-2:rgba(157,140,255,.055);
  --subject-border:rgba(157,140,255,.30);
}
.subject-math{
  --subject:#39d7b4;
  --subject-bright:#83ead3;
  --subject-soft:rgba(57,215,180,.10);
  --subject-soft-2:rgba(57,215,180,.055);
  --subject-border:rgba(57,215,180,.30);
}
.subject-general{
  --subject:#8ea5ff;
  --subject-bright:#b7c4ff;
  --subject-soft:rgba(142,165,255,.09);
  --subject-soft-2:rgba(142,165,255,.05);
  --subject-border:rgba(142,165,255,.28);
}
.module-card.subject-rw,.module-card.subject-math,.module-card.subject-general{
  border-color:var(--subject-border);
  background:linear-gradient(145deg,var(--subject-soft),rgba(255,255,255,.012) 58%);
  box-shadow:inset 0 1px 0 rgba(255,255,255,.025);
}
.module-card.subject-rw::before,.module-card.subject-math::before,.module-card.subject-general::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--subject);opacity:.9;
}
.module-card.subject-rw:hover,.module-card.subject-math:hover,.module-card.subject-general:hover{
  border-color:var(--subject);background:linear-gradient(145deg,var(--subject-soft),rgba(255,255,255,.025));
  box-shadow:0 16px 44px rgba(0,0,0,.22),inset 0 1px 0 rgba(255,255,255,.04);
}
.module-card.subject-rw .module-card-top span,.module-card.subject-math .module-card-top span,.module-card.subject-general .module-card-top span,
.module-card.subject-rw .module-card-foot strong,.module-card.subject-math .module-card-foot strong,.module-card.subject-general .module-card-foot strong{color:var(--subject-bright)}
.module-card.subject-rw .tag-row span,.module-card.subject-math .tag-row span,.module-card.subject-general .tag-row span{
  border-color:var(--subject-border);background:var(--subject-soft-2);color:var(--subject-bright);
}
.filter-row button[data-filter="Reading & Writing"]{color:#bdb2ff;border-color:rgba(157,140,255,.25)}
.filter-row button[data-filter="Reading & Writing"]:hover,.filter-row button[data-filter="Reading & Writing"].active{background:#9d8cff;color:#090b12;border-color:#9d8cff}
.filter-row button[data-filter="Math"]{color:#79e5cd;border-color:rgba(57,215,180,.25)}
.filter-row button[data-filter="Math"]:hover,.filter-row button[data-filter="Math"].active{background:#39d7b4;color:#06110e;border-color:#39d7b4}
#readerScreen.subject-rw,#readerScreen.subject-math,#readerScreen.subject-general{--reader-accent:var(--subject);--reader-bright:var(--subject-bright);--reader-soft:var(--subject-soft);--reader-border:var(--subject-border)}
#readerScreen.subject-rw .eyebrow,#readerScreen.subject-math .eyebrow,#readerScreen.subject-general .eyebrow,
#readerScreen.subject-rw .back-button,#readerScreen.subject-math .back-button,#readerScreen.subject-general .back-button,
#readerScreen.subject-rw .inline-video-label span,#readerScreen.subject-math .inline-video-label span,#readerScreen.subject-general .inline-video-label span,
#readerScreen.subject-rw .pdf-panel-head span,#readerScreen.subject-math .pdf-panel-head span,#readerScreen.subject-general .pdf-panel-head span,
#readerScreen.subject-rw .pdf-empty>span,#readerScreen.subject-math .pdf-empty>span,#readerScreen.subject-general .pdf-empty>span{color:var(--reader-bright)}
#readerScreen.subject-rw .reader-hero,#readerScreen.subject-math .reader-hero,#readerScreen.subject-general .reader-hero{border-bottom-color:var(--reader-border)}
#readerScreen.subject-rw .reader-hero::before,#readerScreen.subject-math .reader-hero::before,#readerScreen.subject-general .reader-hero::before{
  content:"";position:absolute;inset:-70px auto auto -90px;width:430px;height:220px;pointer-events:none;background:radial-gradient(circle,var(--reader-soft),transparent 68%);filter:blur(4px)
}
#readerScreen .reader-hero{position:relative}
#readerScreen.subject-rw .reader-actions span,#readerScreen.subject-math .reader-actions span,#readerScreen.subject-general .reader-actions span,
#readerScreen.subject-rw .reader-actions button,#readerScreen.subject-math .reader-actions button,#readerScreen.subject-general .reader-actions button{
  border-color:var(--reader-border);background:var(--reader-soft);color:var(--reader-bright)
}
#readerScreen.subject-rw .tag-row span,#readerScreen.subject-math .tag-row span,#readerScreen.subject-general .tag-row span{
  border-color:var(--reader-border);background:var(--reader-soft-2);color:var(--reader-bright)
}
#readerScreen.subject-rw .markdown-card,#readerScreen.subject-math .markdown-card,#readerScreen.subject-general .markdown-card,
#readerScreen.subject-rw .pdf-side-panel,#readerScreen.subject-math .pdf-side-panel,#readerScreen.subject-general .pdf-side-panel{border-color:var(--reader-border)}
#readerScreen.subject-rw .markdown-body h2,#readerScreen.subject-math .markdown-body h2,#readerScreen.subject-general .markdown-body h2{color:var(--reader-bright)}
#readerScreen.subject-rw .markdown-body blockquote,#readerScreen.subject-math .markdown-body blockquote,#readerScreen.subject-general .markdown-body blockquote{
  border-left-color:var(--reader-accent);background:var(--reader-soft)
}
#readerScreen.subject-rw .video-frame,#readerScreen.subject-math .video-frame,#readerScreen.subject-general .video-frame{border-color:var(--reader-border);box-shadow:0 0 0 1px var(--reader-soft)}
#readerScreen.subject-rw .pdf-panel-head a,#readerScreen.subject-math .pdf-panel-head a,#readerScreen.subject-general .pdf-panel-head a{color:var(--reader-bright);border-color:var(--reader-border);background:var(--reader-soft)}
#readerScreen.subject-rw .pdf-tabs button.active,#readerScreen.subject-math .pdf-tabs button.active,#readerScreen.subject-general .pdf-tabs button.active{background:var(--reader-accent);border-color:var(--reader-accent);color:#07100e}

/* 2026 study-flow redesign: video + condensed notes + mastery check */
.module-flow-preview{display:flex;align-items:center;gap:7px;margin-top:20px;color:#6f7d91;font-size:9px;font-weight:900;letter-spacing:.1em}.module-flow-preview i{width:22px;height:1px;background:var(--subject-border,var(--line))}.module-card.subject-rw .module-flow-preview span,.module-card.subject-math .module-flow-preview span,.module-card.subject-general .module-flow-preview span{color:var(--subject-bright)}
.study-stage{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(320px,.85fr);gap:22px;align-items:start;margin-top:30px}.video-study-card,.summary-study-card{border:1px solid var(--reader-border,var(--line));border-radius:25px;background:rgba(255,255,255,.02);overflow:hidden}.video-study-card{padding:20px}.study-section-label{display:flex;align-items:center;gap:11px;margin-bottom:15px}.study-section-label>span,.summary-head>div>span{display:grid;place-items:center;width:31px;height:31px;border:1px solid var(--reader-border,var(--line));border-radius:9px;color:var(--reader-bright,#9fb0ff);font:800 10px Manrope;background:var(--reader-soft,rgba(142,165,255,.06))}.study-section-label strong,.study-section-label small,.summary-head strong,.summary-head small{display:block}.study-section-label strong,.summary-head strong{font:800 10px Manrope;letter-spacing:.14em;color:#eef3fb}.study-section-label small,.summary-head small{margin-top:2px;color:#647489;font-size:10px}.video-study-card .video-frame{border-radius:18px}.video-empty-state{min-height:350px;display:grid;place-items:center;align-content:center;text-align:center;border:1px dashed var(--reader-border,var(--line));border-radius:18px;background:#05070c}.video-empty-state span{font-size:9px;letter-spacing:.14em;font-weight:900;color:var(--reader-bright,#91a5ff)}.video-empty-state strong{font:800 26px Manrope;margin-top:10px}.video-empty-state p{max-width:340px;color:#6f7e91}.extra-videos .video-frame{margin-top:16px}.extra-video-heading{margin:20px 0 4px;padding-top:18px;border-top:1px solid var(--line);font-size:9px;letter-spacing:.14em;font-weight:900;color:var(--reader-bright,#91a5ff)}
.summary-study-card{position:sticky;top:100px;max-height:calc(100vh - 125px);overflow:auto}.summary-head{display:flex;justify-content:space-between;gap:15px;align-items:center;padding:17px 18px;border-bottom:1px solid var(--reader-border,var(--line));background:linear-gradient(135deg,var(--reader-soft,rgba(142,165,255,.08)),transparent)}.summary-head>div{display:flex;align-items:center;gap:10px}.summary-head>b{font-size:8px;letter-spacing:.11em;color:#65758a}.summary-body{padding:18px 20px 24px;font-size:14px;line-height:1.65}.summary-body h1{font-size:26px;margin:5px 0 18px}.summary-body h2{font-size:18px;margin:22px 0 8px}.summary-body h3{font-size:15px;margin:18px 0 7px}.summary-body p,.summary-body li{color:#aeb9c8}.summary-body ul,.summary-body ol{padding-left:20px}.summary-body blockquote{margin:16px 0;padding:13px 14px}.summary-body hr{border:0;border-top:1px solid var(--line);margin:20px 0}
.practice-section{margin-top:34px;scroll-margin-top:100px}.practice-head{display:flex;justify-content:space-between;gap:30px;align-items:end;margin:0 0 16px}.practice-eyebrow{margin:0 0 7px;color:var(--reader-bright,#9fb0ff);font-size:9px;font-weight:900;letter-spacing:.15em}.practice-head h2,.results-card h2,.practice-empty h2{margin:0;font:800 clamp(28px,4vw,42px) Manrope;letter-spacing:-.04em}.practice-head>div>p:last-child,.results-card>p,.practice-empty p{margin:8px 0 0;color:#77869a}.practice-counter{display:flex;align-items:baseline}.practice-counter strong{font:800 38px Manrope;color:var(--reader-bright,#9fb0ff)}.practice-counter span{color:#657387}.quiz-progress{height:5px;border-radius:999px;background:rgba(255,255,255,.06);overflow:hidden;margin-bottom:15px}.quiz-progress span{display:block;height:100%;background:var(--reader-accent,#8ea5ff);border-radius:inherit;transition:width .25s ease}
.quiz-card,.results-card,.practice-empty{border:1px solid var(--reader-border,var(--line));border-radius:25px;background:linear-gradient(150deg,var(--reader-soft,rgba(142,165,255,.055)),rgba(255,255,255,.018));padding:clamp(22px,4vw,38px)}.quiz-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#66758a;font-size:9px;font-weight:900;letter-spacing:.12em}.difficulty-badge{padding:7px 10px;border-radius:999px;border:1px solid var(--reader-border,var(--line));color:#c8d2df;background:rgba(255,255,255,.03)}.difficulty-easy .difficulty-badge{color:#83ead3;border-color:rgba(57,215,180,.28);background:rgba(57,215,180,.08)}.difficulty-medium .difficulty-badge{color:#8ebcff;border-color:rgba(95,155,255,.28);background:rgba(95,155,255,.08)}.difficulty-hard .difficulty-badge{color:#f2c56f;border-color:rgba(242,197,111,.28);background:rgba(242,197,111,.08)}.difficulty-extreme .difficulty-badge{color:#ff8f9b;border-color:rgba(255,100,120,.30);background:rgba(255,100,120,.08)}.question-copy{margin:23px 0 20px;font-size:17px;line-height:1.7}.question-copy p{color:#e0e6ef}.choice-list{display:grid;gap:9px}.choice-button{display:grid;grid-template-columns:35px 1fr;gap:12px;align-items:center;text-align:left;width:100%;border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:rgba(0,0,0,.16);color:#c7d0dc;cursor:pointer;transition:.16s ease}.choice-button:hover:not(:disabled),.choice-button.selected{border-color:var(--reader-border,var(--line));background:var(--reader-soft,rgba(142,165,255,.08));transform:translateX(2px)}.choice-button>span{display:grid;place-items:center;width:32px;height:32px;border:1px solid var(--line);border-radius:9px;font:800 11px Manrope}.choice-button>b{font:600 13px/1.5 "DM Sans"}.choice-button.correct{border-color:rgba(69,218,164,.44);background:rgba(69,218,164,.09)}.choice-button.wrong{border-color:rgba(255,102,120,.45);background:rgba(255,102,120,.08)}.choice-button:disabled{cursor:default}.answer-feedback{margin-top:16px;padding:15px 17px;border-radius:14px;border:1px solid var(--line)}.answer-feedback strong{display:block}.answer-feedback p{margin:5px 0 0;color:#9ba8b9;line-height:1.6;font-size:13px}.correct-feedback{border-color:rgba(69,218,164,.28);background:rgba(69,218,164,.055)}.correct-feedback strong{color:#77e0ba}.wrong-feedback{border-color:rgba(255,102,120,.28);background:rgba(255,102,120,.05)}.wrong-feedback strong{color:#ff9ba6}.quiz-actions,.result-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px}.quiz-link-button,.quiz-primary-button{border-radius:11px;padding:11px 15px;font:800 11px "DM Sans";cursor:pointer}.quiz-link-button{border:1px solid var(--line);background:transparent;color:#8c9aad}.quiz-primary-button{border:1px solid var(--reader-accent,#8ea5ff);background:var(--reader-accent,#8ea5ff);color:#07100e}.quiz-primary-button:disabled{opacity:.35;cursor:not-allowed}.result-score{display:flex;align-items:baseline;margin:15px 0 2px}.result-score strong{font:800 clamp(64px,10vw,100px)/.9 Manrope;color:var(--reader-bright,#9fb0ff);letter-spacing:-.06em}.result-score span{font:700 24px Manrope;color:#6b798d}.difficulty-results{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-top:22px}.difficulty-results>div{padding:13px;border:1px solid var(--line);border-radius:13px;background:rgba(0,0,0,.13)}.difficulty-results span,.difficulty-results strong{display:block}.difficulty-results span{font-size:8px;letter-spacing:.1em;color:#718096}.difficulty-results strong{font:800 20px Manrope;margin-top:5px}.practice-empty{text-align:center;padding:50px 25px}.practice-empty>span{font-size:9px;letter-spacing:.15em;font-weight:900;color:var(--reader-bright,#9fb0ff)}
.summary-editor-shell{display:grid;grid-template-columns:1fr 1fr;min-height:390px;margin-top:18px;border:1px solid var(--line);border-radius:18px;overflow:hidden}.summary-editor-shell .editor-pane{border-right:1px solid var(--line);border-bottom:0}.summary-editor-shell textarea{width:100%;height:330px;resize:vertical;line-height:1.6;border:1px solid var(--line);background:#080d15;color:#eef3fa;border-radius:11px;padding:12px;font:14px inherit}.summary-editor-shell .preview-pane{min-height:390px}
@media(max-width:980px){.study-stage{grid-template-columns:minmax(0,1.3fr) minmax(300px,.8fr)}}
@media(max-width:850px){.study-stage{grid-template-columns:1fr}.summary-study-card{position:relative;top:auto;max-height:none}.summary-editor-shell{grid-template-columns:1fr}.summary-editor-shell .editor-pane{border-right:0;border-bottom:1px solid var(--line)}.difficulty-results{grid-template-columns:repeat(2,1fr)}}
@media(max-width:580px){.video-study-card{padding:12px}.summary-head{align-items:flex-start}.summary-head>b{display:none}.practice-head{align-items:flex-start}.practice-counter{display:none}.quiz-card,.results-card{padding:20px 14px}.choice-button{grid-template-columns:31px 1fr;padding:10px}.choice-button>span{width:29px;height:29px}.quiz-actions,.result-actions{justify-content:stretch}.quiz-actions button,.result-actions button{flex:1}.difficulty-results{grid-template-columns:1fr 1fr}}