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transform;background:linear-gradient(#fffffffa,#fff1dbfa);border-radius:8px 8px 4px 4px;top:16px;bottom:auto;box-shadow:inset 0 1px #ffffffd9}.heart-seal{z-index:6;width:22px;height:20px;color:var(--text-main);filter:drop-shadow(0 0 10px color-mix(in srgb, var(--text-main), transparent 44%));transition:opacity .4s var(--ease), transform .5s var(--ease);backface-visibility:hidden;will-change:opacity, transform;position:absolute;top:66px;left:50%;transform:translate(-50%)}.heart-seal svg{fill:currentColor;width:100%;height:100%}.letter-page{left:50%;top:calc(58% - var(--stage-lift));z-index:9;width:calc(100% - 32px);height:0;box-shadow:0 0 40px color-mix(in srgb, var(--cream-text), transparent 58%), 0 22px 62px #0000004d;opacity:0;transform-origin:50% 100%;pointer-events:none;backface-visibility:hidden;will-change:opacity, transform;transition:top 1.1s var(--ease), height 1.1s var(--ease), opacity .8s var(--ease), transform 1.1s var(--ease);background:linear-gradient(#fffffffa,#fffaeefa);border:1px solid #ffffffb8;border-radius:10px;position:absolute;overflow:hidden;transform:translate(-50%)translateY(24px)scale(.88)}.letter-content{z-index:1;scrollbar-width:none;height:100%;padding:54px 20px 28px;position:relative;overflow-y:auto}.letter-content::-webkit-scrollbar{display:none}.letter-copy{letter-spacing:0;color:#8b6a55;text-align:left;text-shadow:0 2px 10px color-mix(in srgb, var(--cream-text), transparent 38%);margin:0 0 22px;font-family:STXingkai,华文行楷,FZYaoti,方正姚体,KaiTi,楷体,cursive;font-size:18px;line-height:1.72}.letter-copy p{margin:0 0 8px}.letter-gallery{grid-template-columns:1fr;gap:14px;display:grid}.letter-gallery[hidden],.letter-media[hidden]{display:none}.letter-gallery img{aspect-ratio:4/5;object-fit:cover;background:#ffffffb3;border:1px solid #ffffffc2;border-radius:9px;width:100%;display:block;box-shadow:0 12px 26px #502a3a24,inset 0 0 0 1px #ffffff8a}.letter-media{grid-template-columns:1fr;gap:12px;margin-top:14px;display:grid}.letter-media video,.letter-media audio{background:#ffffffbd;border:1px solid #ffffffc7;border-radius:9px;width:100%;display:block;box-shadow:0 12px 26px #502a3a24}.letter-media video{aspect-ratio:4/5;object-fit:cover}.letter-audio-card{background:radial-gradient(circle at 16% 18%,#ffffffe0,#0000 36%),linear-gradient(135deg,#ffffffeb,#fff7e6f0);border:1px solid #ffffffd1;border-radius:12px;grid-template-columns:46px 1fr;align-items:center;gap:12px;padding:13px;display:grid;box-shadow:0 14px 30px #502a3a24,inset 0 0 0 1px #ffffff9e}.letter-audio-play{color:#fff;background:linear-gradient(135deg, var(--text-main), var(--coral));cursor:pointer;border:0;border-radius:50%;place-items:center;width:46px;height:46px;font-size:18px;font-weight:900;display:grid;box-shadow:0 10px 20px #ff8ab340}.letter-audio-main{gap:7px;min-width:0;display:grid}.letter-audio-title{color:#8b6a55;text-overflow:ellipsis;white-space:nowrap;font-size:14px;font-weight:900;overflow:hidden}.letter-audio-bar{background:#784a5b1f;border-radius:999px;height:8px;position:relative;overflow:hidden}.letter-audio-progress{border-radius:inherit;background:linear-gradient(90deg, var(--text-main), var(--cream-text));width:0%;height:100%;transition:width .12s linear}.letter-audio-time{color:#8b6a55a8;text-align:right;font-size:12px;font-weight:700}.letter-audio-card audio{display:none}.letter-close{z-index:2;border:1px solid color-mix(in srgb, var(--text-main), var(--cream-text) 72%);width:30px;height:30px;color:color-mix(in srgb, var(--text-main), #8b6b45 34%);cursor:pointer;opacity:0;transition:opacity .36s var(--ease) .52s, transform .36s var(--ease) .52s, border-color .22s var(--ease);background:radial-gradient(circle at 32% 26%,#fffffff2,#fffaeed1);border-radius:50%;padding:0;position:absolute;top:12px;right:12px;transform:scale(.82);box-shadow:inset 0 0 0 1px #ffffff94,0 8px 18px #54304224}.letter-close:before,.letter-close:after{content:"";transform-origin:50%;background:currentColor;border-radius:99px;width:13px;height:1.5px;position:absolute;top:50%;left:50%}.letter-close:before{transform:translate(-50%,-50%)rotate(45deg)}.letter-close:after{transform:translate(-50%,-50%)rotate(-45deg)}.letter-close:hover{border-color:color-mix(in srgb, var(--text-main), var(--cream-text) 50%);transform:scale(.92)}.heart-seal{color:var(--text-main);filter:drop-shadow(0 0 10px #ff8ab38c)}.letter-page{box-shadow:0 0 40px #fff5d86b,0 22px 62px #0000004d}.letter-copy{color:#8b6a55;text-shadow:0 1px #ffffffdb,0 0 12px #8b6a5524}.letter-close{color:var(--text-main);border-color:#ff8ab357}.envelope:before,.envelope:after,.envelope-back,.envelope-front,.envelope-flap{border-color:#dcb8785c}:root[data-theme=blue] .heart-seal,:root[data-theme=blue] .letter-close{color:#6aa8f7}:root[data-theme=lavender] .heart-seal,:root[data-theme=lavender] .letter-close{color:#b989ef}:root[data-theme=sage] .heart-seal,:root[data-theme=sage] .letter-close{color:#63b98c}:root[data-theme=peach] .heart-seal,:root[data-theme=peach] .letter-close{color:#ef8e73}.screen.gift-opened .gift-button{z-index:4;opacity:0;pointer-events:none;filter:none;animation:none;transform:translate(-50%)translateY(22px)scale(.86)}.screen.gift-opened .envelope-flap{opacity:0;transform:none}.screen.gift-opened .heart-seal{opacity:0;transform:translate(-50%)translateY(-8px)scale(.72)}.screen:not(.gift-opened) .heart-seal{z-index:7;opacity:1}.screen.gift-opened .letter-page{top:calc(6% - var(--stage-lift));opacity:1;pointer-events:auto;height:88%;transform:translate(-50%)translateY(0)scale(1)}.screen.gift-opened .letter-close{opacity:.92;transform:scale(1)}@keyframes envelopeFloat{0%,to{transform:translate(-50%)translateY(0)scale(1)}50%{transform:translate(-50%)translateY(-4px)scale(1.015)}}@keyframes tunnel{to{transform:rotate(360deg)}}@keyframes riseText{0%{opacity:0;transform:translate3d(var(--sway0), 90px, var(--z)) rotateY(var(--ry)) rotateZ(var(--rz)) scale(var(--scale))}9%{opacity:var(--alpha)}68%{opacity:var(--alpha)}to{opacity:0;transform:translate3d(var(--sway1), -860px, var(--zEnd)) rotateY(var(--ry2)) rotateZ(var(--rz)) scale(calc(var(--scale) * 1.2))}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:1ms!important;animation-duration:1ms!important}}