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cubic-bezier(.4,0,.2,1);transform:translateY(20px);cursor:pointer;box-sizing:border-box;box-shadow:0 4px 12px rgba(0,0,0,.1)}.back-to-top-wrapper.is-visible{opacity:.9;pointer-events:auto;transform:translateY(0)}.back-to-top-wrapper:hover{opacity:1;transform:translateY(-5px);background-color:var(--vermillion,#ce5c5c);border-color:var(--vermillion,#ce5c5c);box-shadow:0 8px 20px rgba(206,92,92,.3)}.back-to-top-wrapper span{max-width:0;opacity:0;white-space:nowrap;overflow:hidden;color:var(--paper-warm,linen);font-family:var(--font-brand,"LXGW WenKai TC",serif);font-size:16px;transition:max-width .4s cubic-bezier(.4,0,.2,1),opacity .3s ease,margin-right .4s ease}.back-to-top-wrapper:hover span{max-width:120px;opacity:1;margin-right:10px}.back-to-top-seal{width:50px;height:50px;border:2px solid var(--vermillion);border-radius:50%;background-color:var(--paper-warm);color:transparent;-webkit-text-stroke:1.2px var(--vermillion);font-family:var(--font-brand);font-size:26px;display:flex;align-items:center;justify-content:center;box-shadow:inset 0 0 0 1px var(--paper-cream),inset 0 0 0 3px var(--vermillion);animation:rotateSeal 15s linear infinite;transition:all .4s cubic-bezier(.4,0,.2,1);flex-shrink:0}.back-to-top-wrapper:hover .back-to-top-seal{animation-play-state:paused;color:var(--vermillion);-webkit-text-stroke:0;background-color:var(--paper-light);border-color:transparent;box-shadow:inset 0 0 0 1px var(--paper-warm),inset 0 0 0 3px var(--vermillion)}@keyframes rotateSeal{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.comments-panel{margin-top:2.2rem}.comments-card{border:1px solid var(--line-soft,rgba(0,0,0,.12));border-radius:16px;background:hsla(0,0%,100%,.55);backdrop-filter:blur(2px);padding:1rem}.comments-title{margin:0 0 .85rem;font-size:1.15rem;color:var(--ink-dark)}.comment-form{display:grid;gap:.65rem;margin-bottom:.9rem}.comment-form input,.comment-form textarea{width:100%;border:1px solid rgba(0,0,0,.16);border-radius:10px;background:hsla(0,0%,100%,.9);color:var(--ink-dark);font:inherit;padding:.65rem .75rem;box-sizing:border-box}.comment-form textarea{min-height:100px;resize:vertical}.comment-form button{justify-self:end;border:none;border-radius:999px;padding:.5rem 1rem;background:var(--vermillion);color:#fff;font-weight:600;cursor:pointer}.comment-form button:disabled{opacity:.6;cursor:not-allowed}.comments-empty,.comments-loading{margin:.4rem 0;color:var(--ink-light)}.comments-list{display:grid;gap:.6rem}.comment-item{border:1px solid rgba(0,0,0,.1);border-radius:10px;padding:.65rem .75rem;background:hsla(0,0%,100%,.85)}.comment-meta{display:flex;justify-content:space-between;align-items:center;margin-bottom:.25rem;font-size:.85rem;color:var(--ink-light)}.comment-author{font-weight:700;color:var(--ink-dark)}.comment-content{margin:0;line-height:1.65}.giscus-hint p{margin:0;color:var(--ink-light)}.floating-back-btn{position:fixed;bottom:40px;left:40px;height:50px;padding:0 11px;background-color:var(--paper-light,#fdf8e6);border:2px solid var(--ink-light,rgba(0,0,0,.4));border-radius:25px;display:flex;align-items:center;justify-content:center;color:var(--ink-dark,#2b2b2b);box-shadow:0 4px 12px rgba(0,0,0,.08);cursor:pointer;z-index:1000;transition:all .3s cubic-bezier(.4,0,.2,1);box-sizing:border-box}.floating-back-btn:hover{background-color:var(--vermillion,#ce5c5c);border-color:var(--vermillion,#ce5c5c);color:var(--paper-warm,linen);transform:translateY(-5px);box-shadow:0 8px 16px rgba(206,92,92,.3)}.floating-back-btn svg{width:24px;height:24px;flex-shrink:0;transition:transform .3s cubic-bezier(.4,0,.2,1)}.floating-back-btn span{max-width:0;opacity:0;white-space:nowrap;overflow:hidden;font-family:var(--font-brand,"LXGW WenKai TC",serif);font-size:16px;transition:max-width .3s cubic-bezier(.4,0,.2,1),opacity .3s cubic-bezier(.4,0,.2,1),margin-left .3s cubic-bezier(.4,0,.2,1)}.floating-back-btn:hover span{max-width:120px;opacity:1;margin-left:6px}.floating-back-btn:hover svg{transform:translateX(-2px)}@media (max-width:768px){.floating-back-btn{bottom:20px;left:20px;height:45px;border-radius:22.5px;padding:0 9px}}