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1;display:flex;flex-direction:column}.btn-sm{font-size:.8rem;padding:var(--space-1) var(--space-4)}.btn-outline{background:transparent;border:1px solid var(--border-gold);color:var(--accent-gold);border-radius:var(--radius-pill);text-decoration:none;display:inline-flex;align-items:center;justify-content:center;transition:background var(--transition-fast)}.btn-outline:hover{background:var(--accent-gold-dim)}.btn-lg{font-size:1.05rem;padding:var(--space-4) var(--space-8)}.btn-danger{background:var(--error-dim);color:var(--error);border:1px solid rgba(255,40,40,.3)}.btn-danger:hover{background:var(--error);color:#fff;border-color:var(--error)}.btn-loading{opacity:.7;pointer-events:none}.btn-spinner{display:inline-block;width:14px;height:14px;border:2px solid;border-top:2px solid transparent;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(1turn)}}.spinner{display:inline-block;width:24px;height:24px;border:2px solid var(--border);border-top-color:var(--accent-gold);animation:spin .7s linear infinite}.skeleton-circle,.spinner{border-radius:50%}.author-avatar-link{display:inline-block;border-radius:50%;transition:opacity var(--transition-fast),transform var(--transition-fast)}.author-avatar-link:hover{opacity:.85;transform:scale(1.05)}body[data-focus=true] .lesson-sidebar,body[data-focus=true] .site-footer,body[data-focus=true] .site-header{opacity:0;pointer-events:none}@media (prefers-reduced-motion:no-preference){body[data-focus=true] .lesson-sidebar,body[data-focus=true] .site-footer,body[data-focus=true] .site-header{transition:opacity var(--transition-slow)}}[data-theme=dark]{--paper:#000000;--surface:#0A0A1A;--ink:#FFFFFF;--hairline:rgba(255,255,255,0.08);--accent:#FFD51E;--accent-warm:#FF6A5C;--accent-warm-dim:rgba(255,106,92,0.14);--accent-soft:rgba(255,213,30,0.12);--accent-warm-soft:rgba(255,106,92,0.16);--glass-bg:rgba(10,10,26,0.7);--bg-primary:#000000;--bg-elevated:#0A0A1A;--bg-surface:#111122;--bg-surface-2:#181830;--skeleton-sheen:rgba(255,255,255,0.07);--accent-gold:#FFD51E;--accent-highlight:#FFF234;--accent-gold-dim:rgba(255,213,30,0.12);--accent-gold-glow:rgba(255,213,30,0.25);--text-primary:#FFFFFF;--text-secondary:#B0B0C0;--text-muted:#606080;--text-on-accent:#0D0D0D;--navy-deep:#050A30;--error:#FF2828;--error-dim:rgba(255,40,40,0.12);--border:rgba(255,255,255,0.08);--border-gold:rgba(255,213,30,0.3);--shadow-card:0 4px 24px rgba(0,0,0,0.4),0 1px 0 rgba(255,255,255,0.04) inset;--shadow-gold:0 0 24px rgba(255,213,30,0.2);--shadow-popup:0 8px 40px rgba(0,0,0,0.6)}[data-theme=dark] body{background-color:var(--bg-primary);color:var(--text-primary)}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:100;background:rgba(251,251,249,.82);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--border);min-height:64px;padding-top:env(safe-area-inset-top);display:flex;align-items:center;will-change:transform}@media (prefers-reduced-motion:no-preference){.site-header{transition:transform var(--transition-normal)}}.site-header--hidden{transform:translateY(-100%)}[data-theme=dark] .site-header{background:rgba(10,10,26,.85)}.header-inner{gap:var(--space-4);height:100%;width:100%;min-width:0}.header-inner,.header-logo{display:flex;align-items:center}.header-logo{gap:var(--space-2);text-decoration:none;flex-shrink:0}.header-logo-icon{color:var(--accent-gold);font-size:1.1rem}.header-logo-cube{display:inline-flex;align-items:center}.header-logo-cube 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.header-nav{transform:none}}.header-login-link{padding:var(--space-2);-webkit-margin-end:var(--space-2);margin-inline-end:var(--space-2)}.header-user-dropdown-wrapper{position:relative;display:inline-flex;align-items:center}.header-user-profile{display:flex;align-items:center;gap:var(--space-2);padding-block:2px;padding-inline:2px var(--space-3);border-radius:var(--radius-pill);background:var(--bg-surface);border:1px solid var(--border);-webkit-margin-end:var(--space-2);margin-inline-end:var(--space-2);cursor:pointer;transition:border-color 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var(--space-8));box-shadow:var(--shadow-card);z-index:10;display:flex;flex-direction:column;padding:var(--space-2) 0;max-height:calc(100dvh - 5rem - env(safe-area-inset-top));overflow-y:auto;overscroll-behavior:contain}.header-dropdown-header{padding:var(--space-2) var(--space-3);display:flex;flex-direction:column}.header-dropdown-name{font-weight:600;font-size:.9rem;color:var(--text-primary)}.header-dropdown-email{font-size:.75rem;color:var(--text-muted)}.header-dropdown-divider{height:1px;background:var(--border);margin:var(--space-1) 0}.header-dropdown-item{display:block;width:100%;text-align:start;padding:var(--space-2) var(--space-3);font-size:.9rem;color:var(--text-secondary);background:transparent;border:none;cursor:pointer;text-decoration:none;transition:all var(--transition-fast)}.header-dropdown-item:hover{background:var(--bg-surface);color:var(--text-primary)}.header-dropdown-item:disabled{opacity:.6;cursor:wait}.text-error,.text-error:hover{color:var(--error)!important}.text-error:hover{background:var(--error-dim)!important}.lesson-page{padding:var(--space-8) 0 var(--space-20)}.lesson-breadcrumb-row{display:flex;align-items:center;justify-content:space-between;gap:var(--space-4);margin-bottom:var(--space-8)}.lesson-container{display:flex;flex-direction:column;gap:0}.lesson-layout{display:grid;grid-template-columns:260px 1fr;grid-gap:var(--space-10);gap:var(--space-10);align-items:flex-start}.lesson-sidebar{position:-webkit-sticky;position:sticky;top:calc(var(--header-height) + var(--space-6));max-height:calc(100vh - var(--header-height) - var(--space-12));overflow-y:auto;scrollbar-width:thin}.lesson-sidebar-inner{display:flex;flex-direction:column;gap:var(--space-4);padding:var(--space-4);background:var(--bg-elevated);border:1px solid 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