.post-chapters__trigger{display:inline-flex;align-items:center;justify-content:center;padding:10px 20px;background-color:#00b4d8;color:#fff;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:background-color 0.3s ease,transform 0.2s ease,opacity 0.3s ease,visibility 0.3s ease;box-shadow:0 4px 8px rgb(0 0 0 / .1);position:fixed;bottom:20px;left:12px;z-index:1000;white-space:nowrap;opacity:0;visibility:hidden;text-transform:none;font-family:'Open Sans',sans-serif;letter-spacing:0}@media (max-width:768px){.post-chapters__trigger{bottom:5px;left:5px}}.post-chapters__trigger.is-visible{opacity:1;visibility:visible}.post-chapters__trigger:hover{background-color:#009cb9;transform:translateY(-2px)}.post-chapters__trigger.is-active{background-color:#00b4d8}.post-chapters__trigger .icon-arrow-small{margin-left:8px;font-size:.8em;transition:transform 0.3s ease}.post-chapters__trigger.is-active .icon-arrow-small{transform:rotate(180deg)}.chapters-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:rgb(0 0 0 / .7);display:flex;justify-content:flex-start;align-items:center;z-index:1001;opacity:0;visibility:hidden;transition:opacity 0.3s ease,visibility 0.3s ease}.chapters-overlay.is-visible{opacity:1;visibility:visible}@media (max-width:768px){.chapters-overlay{justify-content:center}}.chapters-popup{background-color:#fff;border-radius:12px;box-shadow:0 8px 16px rgb(0 0 0 / .2);padding:24px;max-width:360px;width:90%;max-height:80vh;overflow-y:auto;position:relative;transform:translateX(-20px) translateY(20px);opacity:0;transition:transform 0.3s ease,opacity 0.3s ease;margin-left:20px;display:flex;flex-direction:column;align-items:flex-start}.chapters-overlay.is-visible .chapters-popup{transform:translateX(0) translateY(0);opacity:1}@media (max-width:768px){.chapters-popup{max-width:90%;margin-left:auto;margin-right:auto}}.chapters-popup__header{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px;width:100%;gap:10px}.chapters-popup h2{font-size:1rem;font-weight:600;color:#333;margin:0;flex-grow:1;font-family:'Open Sans',sans-serif}.chapters-popup__close{background:none;border:none;font-size:1.25rem;color:#666;cursor:pointer;padding:4px;border-radius:50%;transition:background 0.2s ease,color 0.2s ease}.chapters-popup__close:hover{background:#f2f2f2;color:#000}.chapters-list{list-style:none;padding:0;margin:0;margin-top:15px;width:100%}.chapters-list li{margin-bottom:6px}.chapters-list a{display:block;padding:6px 12px;background-color:#f7f7f7;border-radius:6px;color:#333;text-decoration:none;font-size:1rem;font-weight:500;transition:background-color 0.2s ease,color 0.2s ease}.chapters-list a:hover{background-color:#eaeaea;color:#007bff}.back-to-top{display:block;margin:20px auto 0;text-align:center;background-color:#00b4d8!important;padding:12px;border-radius:28px;font-weight:600;color:white!important;text-decoration:none;width:85%;font-size:1.1rem!important;transition:background-color 0.2s ease}.back-to-top:hover{background-color:#0099b3}body.dark-mode .post-chapters__trigger{background-color:#0056b3;box-shadow:0 4px 8px rgb(255 255 255 / .1)}body.dark-mode .post-chapters__trigger:hover{background-color:#003f80}body.dark-mode .chapters-popup{background-color:#333;color:#f0f0f0;box-shadow:0 8px 16px rgb(255 255 255 / .1)}body.dark-mode .chapters-popup__close{color:#ccc}body.dark-mode .chapters-popup__close:hover{background:#444;color:#eee}body.dark-mode .chapters-list a{background-color:#444;color:#f0f0f0}body.dark-mode .chapters-list a:hover{background-color:#555;color:#007bff}