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.theme-toggle{background:none;border:none;font-size:1.3rem;cursor:pointer;color:inherit}.site-header__nav.open{display:flex;flex-direction:column;position:absolute;top:64px;left:0;right:0;background:var(--header-bg, #fff);padding:1rem 0;box-shadow:0 2px 10px #0000001a}.site-header__nav.open a{padding:.5rem 0}@media(max-width:768px){.site-header__menu-toggle{display:block}.site-header__nav{display:none}}body.dark{--header-bg: #121212;--header-text: #f5f5f5;background-color:#1a1a1a;color:#e0e0e0}.footer{background:var(--header-bg, var(--primary));color:var(--header-text, var(--secondary));text-align:center;padding:1.5rem 2rem;font-size:.9rem}.footer a{color:inherit;text-decoration:underline}.footer a:hover{color:var(--accent)}.footer p{margin:.25rem 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p{margin-bottom:.8rem}@media(max-width:768px){.part-page{flex-direction:column}.part-page .part-page__sidebar{position:fixed;top:0;left:0;height:100%;z-index:1000;transform:translate(-100%);box-shadow:2px 0 8px #0003}.part-page .part-page__sidebar.open{transform:translate(0)}.part-page .part-page__sidebar .sidebar-header .close-btn{display:block}.part-page .part-page__main .mobile-sidebar-toggle{display:inline-block}}body.dark .part-page{background:var(--bg-color)}body.dark .part-page .part-page__sidebar{background:var(--card-bg);border-color:#444}body.dark .part-page .part-page__sidebar button{color:var(--text-secondary)}body.dark .part-page .part-page__sidebar button.active{color:var(--primary)}body.dark .part-page .part-page__main{color:var(--text-color)}body.dark .part-page .part-page__main .breadcrumbs span,body.dark .part-page .part-page__main .lesson-media .lesson-transcript__text p{color:var(--text-secondary)}:root{--primary: #3f51b5;--primary--hover: #4a5fd8;--secondary: 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iframe{width:100%;height:400px;border:none}.header{background:var(--primary);color:#fff;padding:.75rem 1.5rem;box-shadow:0 2px 6px #0000001a;position:sticky;top:0;z-index:10}.header__inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;max-width:1200px;margin:0 auto}.header__title{font-size:1.2rem;font-weight:600;margin:0}.header__title a{color:#fff;text-decoration:none}.header__title a:hover{text-decoration:underline}.header__menu-toggle{display:none;background:none;border:none;color:#fff;font-size:1.5rem;cursor:pointer}@media(max-width:768px){.header__menu-toggle{display:block}}.header__nav{display:flex;gap:1rem}@media(max-width:768px){.header__nav{display:none;width:100%;flex-direction:column;margin-top:.5rem}}.header__nav.open{display:flex}.header__link{color:#fff;text-decoration:none;font-size:.95rem;font-weight:500;padding:.3rem .6rem;border-radius:var(--border-radius);transition:background var(--transition)}.header__link:hover{background:#ffffff26}.header__link.active{background:#ffffff40}