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12px;--shadow: 0 4px 20px rgba(26, 63, 111, .1);--shadow-lg: 0 12px 40px rgba(26, 63, 111, .16);--spacing-1: 4px;--spacing-2: 8px;--spacing-3: 12px;--spacing-4: 16px;--spacing-5: 20px;--spacing-6: 24px}[data-theme=dark]{--bg: #0b1220;--surface: #0f172a;--text: #e5e7eb;--text-muted: #94a3b8;--border: #1f2a44;--shadow: 0 8px 20px rgba(0,0,0,.35)}.app-shell{display:grid;grid-template-columns:260px 1fr;grid-template-rows:64px 1fr;grid-template-areas:"header header" "sidebar content";min-height:100dvh;background:var(--bg)}.app-header{grid-area:header;display:flex;align-items:center;justify-content:space-between;padding:0 var(--spacing-5);background:var(--surface);border-bottom:1px solid var(--border);box-shadow:var(--shadow)}.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:.2px;color:var(--primary-600)}.app-sidebar{grid-area:sidebar;padding:var(--spacing-5);border-right:1px solid 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8px;color:var(--text)}.muted{color:var(--text-muted)}app-course-player,app-course-player .viewer,app-course-player .viewer-body,app-course-player .course-html{max-width:100%;overflow-x:hidden}app-course-player .course-html *{max-width:100%!important;box-sizing:border-box}app-course-player .course-html img{display:block!important;max-width:100%!important;width:min(300px,100%)!important;height:auto!important;aspect-ratio:3 / 2;object-fit:cover;margin:12px auto!important;border-radius:12px;background:#f3f4f6}app-course-player .course-html img[style],app-course-player .course-html img[width],app-course-player .course-html img[height]{max-width:100%!important;width:min(300px,100%)!important;height:auto!important}app-course-player .course-html figure,app-course-player .course-html section,app-course-player .course-html div{max-width:100%;overflow:hidden}app-course-player .course-html table,app-course-player .course-html pre,app-course-player .course-html 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