:root{--progress-height: 4px;--toc-width: 280px;--toc-bg: rgba(255, 255, 255, .95);--toc-text: #333;--toc-hover: #f0f0f0}body.dark-mode{--toc-bg: rgba(30, 30, 30, .95);--toc-text: #e0e0e0;--toc-hover: #333}.animate-on-scroll{opacity:1;transform:translateY(0);transition:none}.animate-on-scroll.visible{opacity:1;transform:translateY(0)}.delay-100{transition-delay:.1s}.delay-200{transition-delay:.2s}.delay-300{transition-delay:.3s}.progress-container{position:fixed;top:0;left:0;width:100%;height:var(--progress-height);background:transparent;z-index:10002}.progress-bar{height:100%;background:linear-gradient(90deg,var(--primary),var(--secondary));width:0%;transition:width .1s ease-out;box-shadow:0 2px 4px #0000001a}.floating-toc{position:fixed;top:100px;right:20px;width:var(--toc-width);background:var(--toc-bg);backdrop-filter:blur(10px);border-radius:12px;padding:1.5rem;box-shadow:0 4px 20px #0000001a;z-index:99;max-height:calc(100vh - 140px);overflow-y:auto;border:1px solid rgba(0,0,0,.05);transition:transform .3s ease,opacity .3s ease;opacity:0;pointer-events:none;transform:translate(20px)}.floating-toc.active{opacity:1;pointer-events:all;transform:translate(0)}.toc-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem;font-weight:600;color:var(--primary)}.toc-list{list-style:none;padding:0;margin:0}.toc-item{margin-bottom:.5rem}.toc-link{display:block;padding:8px 12px;color:var(--toc-text);text-decoration:none;border-radius:6px;font-size:.9rem;transition:all .2s;border-left:3px solid transparent}.toc-link:hover{background:var(--toc-hover);padding-left:15px}.toc-link.active{background:var(--primary-fade);color:var(--primary);border-left-color:var(--primary);font-weight:600}.toc-toggle{position:fixed;bottom:2rem;right:2rem;width:50px;height:50px;background:var(--primary);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:0 4px 15px #0003;z-index:100;transition:transform .3s,background .3s;font-size:1.2rem}.toc-toggle:hover{transform:scale(1.1);background:var(--primary-dark)}.answer-block{overflow:hidden;transition:max-height .4s ease-out,opacity .4s ease-out,padding .4s ease;max-height:0;opacity:0;padding-top:0;padding-bottom:0;display:block!important}.answer-block.show{max-height:none;opacity:1;padding:20px}.btn-premium{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;padding:10px 24px;border-radius:30px;font-weight:600;letter-spacing:.5px;box-shadow:0 4px 15px #7b1fa24d;transition:all .3s;display:inline-flex;align-items:center;gap:8px}.btn-premium:hover{transform:translateY(-2px);box-shadow:0 6px 20px #7b1fa266}.checklist-item{transition:background .2s;padding:8px;border-radius:8px}.checklist-item:hover{background:#00000005}.checklist-item.checked{text-decoration:line-through;color:#888;background:#2e7d320d}@media(max-width:1200px){.floating-toc{display:none;right:20px;bottom:90px;top:auto;transform:translateY(20px)}.floating-toc.active{display:block;transform:translateY(0)}}.step-container{background:#fff;padding:1rem;border-left:4px solid var(--primary);margin-bottom:1rem;border-radius:8px;box-shadow:0 2px 5px #0000000d;overflow-x:hidden;white-space:normal;word-wrap:break-word;overflow-wrap:break-word;word-break:break-word}mjx-container[display=true]{white-space:normal!important;overflow-x:auto!important;overflow-y:hidden!important;font-size:100%!important;max-width:100%;padding-bottom:2px!important}mjx-container:not([display=true]){overflow:visible!important}.mark-badge{float:right;font-size:.8rem;background:#eee;padding:2px 8px;border-radius:4px;color:#555}body.dark-mode .step-container{background:#252525;border-left-color:var(--primary-light);color:#e0e0e0}body.dark-mode .mark-badge{background:#333;color:#e0e0e0}