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(width<=768px){.chapter-nav{gap:8px;right:10px}.chapter-dot{width:6px;height:6px}.chapter-dot:before{display:none}}.envelope-container{z-index:100;background:var(--color-bg);justify-content:center;align-items:center;display:flex;position:fixed;inset:0;overflow:hidden}.envelope{aspect-ratio:1.4;cursor:pointer;perspective:1200px;width:clamp(280px,70vw,400px);position:relative}.envelope-body{border:1px solid var(--color-border);background:linear-gradient(145deg,#1a1520 0%,#12101a 50%,#0e0c16 100%);border-radius:8px;position:absolute;inset:0;overflow:hidden;box-shadow:0 20px 60px #00000080,inset 0 1px #c9a96e1a}.envelope-flap{border:1px solid var(--color-border);clip-path:polygon(0 0,100% 0,50% 100%);transform-origin:top;height:55%;transition:transform 1.2s var(--ease-cinematic);z-index:2;background:linear-gradient(#1a1520 0%,#15121e 100%);border-radius:8px 8px 0 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