:root{--body-background:#eceef0;--card-background:#ffffff;--card-background-selected:#e4e6ea;--card-text-color-main:#292b30;--card-text-color-secondary:#60636a;--card-text-color-tertiary:#7b7e85;--card-separator-color:rgba(47, 49, 54, 0.14);--body-text-color:#34363b;--accent-color:#292b30;--accent-color-darker:#111216;--accent-color-text:#ffffff;--card-border-radius:16px}:root[data-scheme=dark]{--body-background:#18171d;--card-background:#1d1e22;--card-background-selected:#2c2c2c;--card-text-color-main:rgba(255, 255, 255, 0.92);--card-text-color-secondary:#a8a8a8;--card-text-color-tertiary:#9a9a9a;--card-separator-color:rgba(66, 68, 74, 0.62);--body-text-color:#d2d2d2;--accent-color:rgba(255, 255, 255, 0.92);--accent-color-darker:#ffffff;--accent-color-text:#18171d}:root{--sys-font-family:-apple-system, BlinkMacSystemFont, "Segoe UI",
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var(--card-separator-color,rgba(128,128,128,.22))}@media(max-width:700px){.codegroup--columns .codegroup__panel+.codegroup__panel{border-left:0;border-top:1px solid var(--card-separator-color,rgba(128,128,128,.22))}}.codeblock{margin:1.8rem 0}.codeblock__bar{display:flex;align-items:center;justify-content:space-between;gap:1em;padding:.55em 1.3em;font-size:.78em;font-family:var(--code-font-family,ui-monospace,SFMono-Regular,Menlo,monospace);color:var(--card-text-color-secondary,#6b6b6b);background:var(--code-tab-background,rgba(128,128,128,8%));border:1px solid var(--card-separator-color,rgba(128,128,128,.22));border-bottom:0;border-radius:var(--card-border-radius,10px)var(--card-border-radius,10px)0 0}.codeblock__title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.codeblock__lang{flex:none;opacity:.65;text-transform:uppercase;letter-spacing:.04em}.codeblock>.highlight{margin:0;border:1px solid var(--card-separator-color,rgba(128,128,128,.22));border-radius:0 0 var(--card-border-radius,10px)var(--card-border-radius,10px)}.codeblock>.highlight>pre{margin:0;border-radius:0}.katex-display{overflow-x:auto;overflow-y:hidden;padding:.4em 0}.katex-display>.katex{font-size:1.06em}.katex .mord,.katex .mbin,.katex .mrel{font-feature-settings:"kern"}.article-content p,.article-content li{line-height:1.8}.article-content code:not(.chroma code){padding:.1em .35em;border-radius:4px}.pinned-list{margin-bottom:2.4em}.pinned-list:last-of-type{margin-bottom:0}.pinned-list__title{display:flex;align-items:center;gap:.62em;margin:0 0 1em;font-size:.82em;font-weight:600;letter-spacing:.18em;color:var(--card-text-color-secondary,#60636a)}.pinned-list__title::before{content:"";flex:none;width:.22em;height:1.05em;border-radius:999px;background:currentColor;opacity:.75}.article-list article{position:relative}.article-list article .article-title a::after{content:"";position:absolute;inset:0}#main-menu .menu-folder{width:100%;padding:0;border:0;background:0 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.mp__panel{opacity:1;visibility:visible;transform:translateY(0)}.mp__head{display:flex;align-items:flex-start;gap:8px;padding-bottom:10px;border-bottom:1px solid rgba(128,128,128,.18)}.mp__now{flex:1;min-width:0}.mp__now-title{margin:0;font-size:.9rem;font-weight:600;color:var(--card-text-color-main);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mp__now-artist{margin:2px 0 0;font-size:.76rem;color:var(--card-text-color-tertiary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mp__close{flex:none;width:24px;height:24px;padding:4px;border:none;border-radius:6px;background:0 0;color:var(--card-text-color-tertiary);cursor:pointer}.mp__close:hover{background:rgba(128,128,128,.14);color:var(--card-text-color-main)}.mp svg{display:block;fill:currentColor}.mp__close svg{width:16px;height:16px}.mp__btn svg{width:18px;height:18px}.mp__status{margin:10px 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10px #0004;font-family:microsoft yahei,sans-serif}.gift-popup__bar{display:flex;align-items:center;justify-content:space-between;height:17px;padding:0 6px;background:#f8f7faf2;color:#817986;font-size:8px;line-height:1}.gift-popup__bar>:last-child{font-size:12px}.gift-popup__message{display:flex;align-items:center;justify-content:center;height:calc(100% - 17px);padding:0 3px;white-space:nowrap;font-size:13px;font-weight:500}.gift-controls{position:absolute;top:max(18px,env(safe-area-inset-top));right:max(18px,env(safe-area-inset-right));z-index:8;display:flex;gap:8px}.gift-controls button{padding:9px 15px;border:1px solid #c5c8e333;border-radius:24px;background:#101327b3;color:#d2d4e5;font:inherit;font-size:12px;cursor:pointer;backdrop-filter:blur(12px)}.gift-controls button:hover{background:#2b2b46;color:#fff}.gift-controls button:focus-visible{outline:2px solid #edc98b;outline-offset:4px}.gift-controls [hidden],.gift-heart[hidden],.gift-wishes[hidden],.gift-stage[hidden],.gift-article[hidden]{display:none}@media(max-width:600px){.gift-popup__bar{height:14px;font-size:7px;padding:0 4px}.gift-popup__message{height:calc(100% - 14px);font-size:10px}}.gift-stage__caption{position:absolute;right:1.6rem;bottom:2.4rem;left:1.6rem;z-index:2;margin:0;color:rgba(255,255,255,.72);font-size:1.4rem;line-height:1.7;letter-spacing:.06em;text-align:center;text-shadow:0 0 12px rgba(255,143,184,.55);pointer-events:none}.gift-envelope-wrap{position:relative;z-index:5;display:flex;flex-direction:column;align-items:center;gap:2.2rem;padding:2rem;perspective:1200px}.gift-stage.is-dimming .gift-heart,.gift-stage.is-dimming .gift-wishes{opacity:0;transition:opacity 1.5s ease}.gift-envelope-wrap[hidden],.gift-letter[hidden],.gift-fallback[hidden]{display:none}.gift-envelope-wrap:not([hidden]){animation:gift-fade-in 900ms ease both}.gift-envelope{position:relative;display:block;width:min(28rem,84vw);aspect-ratio:28/18;padding:0;border:0;background:0 0;color:inherit;font:inherit;text-align:inherit;cursor:pointer;transform-style:preserve-3d;-webkit-tap-highlight-color:transparent;animation:gift-envelope-idle 3600ms ease-in-out infinite}.gift-envelope:focus-visible{outline:2px solid var(--gift-rose);outline-offset:1.2rem;border-radius:.8rem}.gift-envelope__back{position:absolute;inset:0;background:linear-gradient(160deg,var(--gift-rose-deep) 0%,var(--gift-rose-dark) 100%);border-radius:.8rem;box-shadow:0 2rem 5rem rgba(0,0,0,.6),0 0 6rem rgba(255,143,184,.28),inset 0 0 3rem rgba(0,0,0,.28)}.gift-envelope__letter{position:absolute;top:5%;left:5%;width:90%;height:90%;background:var(--gift-paper);border-radius:.4rem;box-shadow:0 0 2.4rem rgba(0,0,0,.45);transform:translateY(0);transition:transform 900ms cubic-bezier(.22,.68,.32,1)}.gift-envelope__letter::after{content:"";position:absolute;inset:12% 10%;background:repeating-linear-gradient( 180deg,rgba(142,35,82,.22) 0 1px,transparent 1px 12% );opacity:.55}.gift-envelope__front{position:absolute;inset:0;background:linear-gradient(180deg,var(--gift-rose) 0%,var(--gift-rose-deep) 100%);clip-path:polygon(0 0,50% 56%,100% 0,100% 100%,0 100%);border-radius:0 0 .8rem .8rem;box-shadow:inset 0 -.2rem .6rem rgba(0,0,0,.25)}.gift-envelope__flap{position:absolute;top:0;left:0;width:100%;height:56%;background:linear-gradient(180deg,#ffa6c8 0%,var(--gift-rose-deep) 100%);clip-path:polygon(0 0,100% 0,50% 100%);transform-origin:top center;transform:rotateX(0);transition:transform 720ms cubic-bezier(.5,.05,.3,1)}.gift-envelope__seal{position:absolute;top:52%;left:50%;display:flex;align-items:center;justify-content:center;width:5.6rem;height:5.6rem;color:#ffe9f0;background:radial-gradient(circle at 34% 30%,#ff6f9c 0%,var(--gift-rose-dark) 72%);border-radius:50%;box-shadow:0 .4rem 1.2rem rgba(0,0,0,.45),0 0 2.4rem rgba(255,111,156,.6);transform:translate(-50%,-50%);animation:gift-seal-beat 2600ms ease-in-out infinite}.gift-envelope__seal svg{width:2.8rem;height:2.8rem;fill:currentColor}.gift-envelope.is-open{animation:none;cursor:default}.gift-envelope.is-open .gift-envelope__flap{transform:rotateX(-180deg)}.gift-envelope.is-open .gift-envelope__letter{transform:translateY(-42%)}.gift-envelope.is-open .gift-envelope__seal{opacity:0;transform:translate(-50%,-50%)scale(.4);transition:opacity 420ms ease,transform 420ms ease;animation:none}.gift-envelope__hint{margin:0;color:rgba(255,255,255,.66);font-size:1.3rem;line-height:1.6;letter-spacing:.18em;text-shadow:0 0 10px rgba(255,143,184,.5);animation:gift-hint-breathe 2800ms ease-in-out infinite}.gift-letter{position:absolute;inset:0;z-index:4;display:flex;justify-content:center;align-items:flex-start;overflow-x:hidden;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:8rem 2rem 6rem;background:linear-gradient(180deg,rgba(10,5,16,0) 0%,var(--gift-night-0) 14rem),var(--gift-night-0)}.gift-letter:not([hidden]){animation:gift-letter-in 1e3ms ease both}.gift-letter__paper{width:100%;max-width:72rem;flex-shrink:0;min-width:0;padding:5rem 4.4rem 4.4rem;background-color:var(--gift-paper);background-image:repeating-linear-gradient( 180deg,rgba(142,35,82,.035) 0 1px,transparent 1px 6px ),linear-gradient(180deg,#fff 0%,rgba(255,255,255,0) 30%);border-radius:1.2rem;box-shadow:0 0 6rem rgba(255,143,184,.28),0 2.4rem 6rem rgba(0,0,0,.55),inset 0 0 0 1px var(--gift-paper-edge)}.gift-letter__head{margin-bottom:3.6rem;padding-bottom:2.4rem;border-bottom:1px solid var(--gift-paper-edge);text-align:center}.gift-letter__eyebrow{margin:0 0 1rem;color:var(--gift-rose-deep);font-size:1.3rem;line-height:1.6;font-weight:600;letter-spacing:.4em;text-indent:.4em}.gift-letter__happy{margin:0 0 1.2rem;font-family:snell roundhand,brush script mt,segoe script,hiragino sans gb,cursive;font-size:4.6rem;line-height:1.2;font-weight:700;letter-spacing:.02em;background:linear-gradient(100deg,#d1417c 0%,#ff8fb8 38%,#b8459b 72%,#d1417c 100%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;filter:drop-shadow(0 .2rem .6rem rgba(209,65,124,.22));animation:gift-happy-in 1200ms cubic-bezier(.2,.9,.3,1)both 200ms}@keyframes gift-happy-in{from{opacity:0;transform:translateY(1.6rem)scale(.94)}to{opacity:1;transform:none}}.gift-cake{position:relative;width:12rem;height:15rem;margin:0 auto 3.2rem}.gift-cake__plate{position:absolute;left:50%;bottom:0;width:12rem;height:1.4rem;transform:translateX(-50%);border-radius:50%;background:linear-gradient(180deg,#e8d3d6 0%,#c9aab0 100%);box-shadow:0 .3rem .8rem rgba(74,47,60,.22)}.gift-cake__body{position:absolute;left:50%;bottom:1.1rem;width:9.6rem;height:5.6rem;transform:translateX(-50%);border-radius:.8rem .8rem 1.2rem 1.2rem;background:linear-gradient(170deg,#ffe6ec 0%,#ffc2d6 42%,#f79ab8 100%);box-shadow:inset 0 -.6rem 1rem rgba(180,70,110,.18)}.gift-cake__body::before{content:"";position:absolute;left:0;top:-.9rem;width:100%;height:1.6rem;border-radius:50%;background:radial-gradient(ellipse at 30% 40%,#fff 0%,#ffe3ec 60%,#ffc9dc 100%)}.gift-cake__candle{position:absolute;left:50%;bottom:6.4rem;width:1.2rem;height:4rem;transform:translateX(-50%);border-radius:.3rem;background:repeating-linear-gradient( 180deg,#fff 0 .8rem,#ff8fb8 .8rem 1.6rem );box-shadow:0 .2rem .5rem rgba(74,47,60,.2)}.gift-cake__flame{position:absolute;left:50%;bottom:10.4rem;width:1.1rem;height:1.8rem;transform:translateX(-50%);border-radius:50% 50% 50% 50%/62% 62% 38% 38%;background:radial-gradient(ellipse at 50% 72%,#fff6c9 0%,#ffb347 45%,#ff7043 100%);box-shadow:0 0 1.2rem .6rem rgba(255,168,76,.55),0 0 3rem 1.4rem rgba(255,120,60,.28);animation:gift-flame 1.4s ease-in-out infinite;transform-origin:50% 100%}@keyframes gift-flame{0%,100%{transform:translateX(-50%)scaleY(1)scaleX(1);opacity:1}28%{transform:translateX(-52%)scaleY(1.16)scaleX(.92);opacity:.92}52%{transform:translateX(-48%)scaleY(.9)scaleX(1.06);opacity:1}76%{transform:translateX(-51%)scaleY(1.1)scaleX(.95);opacity:.95}}.gift-letter__title{margin:0;color:var(--gift-ink);font-size:2.8rem;line-height:1.4;font-weight:700}.gift-letter__title,.gift-letter__sub,.gift-letter__body h1,.gift-letter__body h2,.gift-letter__body h3,.gift-letter__body h4,.gift-letter__body h5,.gift-letter__body h6{margin-inline-start:0;padding-inline-start:0;border-inline-start:0}.gift-letter__title:focus,.gift-letter__title:focus-visible,.gift-letter__head h1:focus{outline:none}.gift-letter__body{margin:0;padding:0;color:var(--gift-ink);font-family:var(--base-font-family);font-size:1.6rem;line-height:1.9}.gift-letter__sub{margin:1.2rem 0 0;color:var(--gift-ink-soft);font-size:1.4rem;line-height:1.7}.gift-letter__body{margin:0;padding:0;color:var(--gift-ink);font-family:var(--base-font-family);font-size:1.6rem;line-height:1.9}.gift-letter__body p,.gift-letter__body li{line-height:1.9}.gift-letter__body>p{margin:0 0 1em;text-indent:2em}.gift-letter__body>p:last-child{margin-bottom:0}.gift-letter__body>:first-child{margin-top:0}.gift-letter__body a{color:var(--gift-rose-dark);font-weight:600;text-decoration:underline;text-underline-offset:.2em;transition:color .2s ease}.gift-letter__body a:hover{color:var(--gift-rose-deep)}.gift-letter__body strong{color:var(--gift-rose-dark)}.gift-letter__body code:not(.chroma code){padding:.1em .4em;color:#6b3550;background-color:#f1e6ea;border-radius:.4rem;font-family:var(--code-font-family);font-size:.9em}.gift-letter__body blockquote{margin:2rem 0;padding:1.2rem 1.8rem;color:var(--gift-ink-soft);background-color:rgba(255,143,184,.14);border-inline-start:4px solid var(--gift-rose);border-radius:0 .6rem .6rem 0}.gift-letter__body blockquote .cite a{color:var(--gift-rose-dark)}.gift-letter__body hr{width:6rem;margin:3.2rem auto;height:2px;border:0;background:var(--gift-paper-edge);opacity:1}.gift-letter__body h1,.gift-letter__body h2,.gift-letter__body h3,.gift-letter__body h4,.gift-letter__body h5,.gift-letter__body h6{color:var(--gift-ink)}.gift-letter__body h5,.gift-letter__body h6{border-inline-start-color:var(--gift-rose)}.gift-letter__body li::marker{color:var(--gift-rose-deep)}.gift-letter__body img{border-radius:.8rem;box-shadow:0 1.2rem 3rem rgba(90,40,60,.18)}.gift-letter__foot{margin-top:3.6rem;padding-top:2rem;border-top:1px solid var(--gift-paper-edge);text-align:right}.gift-letter__sign{margin:0;color:var(--gift-rose-dark);font-size:1.5rem;line-height:1.6;font-style:italic;letter-spacing:.08em}.gift-fallback{position:absolute;inset:0;z-index:6;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2.4rem;padding:3rem 2rem;background:var(--gift-night-0);text-align:center}.gift-fallback:not([hidden]){animation:gift-fade-in 600ms ease both}.gift-fallback__text{max-width:34rem;margin:0;color:rgba(255,255,255,.82);font-size:1.6rem;line-height:1.8}.gift-fallback__back{display:inline-block;padding:1rem 2.4rem;color:#fff;background:linear-gradient(135deg,var(--gift-rose) 0%,var(--gift-rose-deep) 100%);border-radius:999px;font-size:1.4rem;font-weight:600;letter-spacing:.08em;text-decoration:none;box-shadow:0 0 2.4rem var(--gift-rose-wash);transition:box-shadow .2s ease,transform .2s ease}.gift-fallback__back:hover{transform:translateY(-2px);box-shadow:0 0 4rem rgba(255,143,184,.45)}@keyframes gift-fade-in{from{opacity:0}to{opacity:1}}@keyframes gift-envelope-idle{0%,100%{transform:translateY(0)rotate(-.7deg)}50%{transform:translateY(-1.2rem)rotate(.7deg)}}@keyframes gift-seal-beat{0%,100%{transform:translate(-50%,-50%)scale(1)}50%{transform:translate(-50%,-50%)scale(1.08)}}@keyframes gift-hint-breathe{0%,100%{opacity:.45}50%{opacity:1}}@keyframes gift-letter-in{from{opacity:0;transform:translateY(3rem)}to{opacity:1;transform:translateY(0)}}.gift-article{padding-bottom:1rem}.gift-hero{margin-bottom:3.2rem;text-align:center}.gift-hero__eyebrow{margin:0 0 1rem;color:var(--gift-rose-deep);font-size:1.3rem;line-height:1.6;font-weight:600;letter-spacing:.42em;text-indent:.42em;text-transform:uppercase}.gift-hero__title{margin:0;font-size:3.2rem;line-height:1.3;font-weight:700}.gift-hero__sub{max-width:42rem;margin:1.4rem auto 0;color:var(--card-text-color-secondary);font-size:1.5rem;line-height:1.8}.gift-gate{margin:0 0 3rem;padding:3rem 2rem;border:1px solid var(--card-separator-color);border-radius:var(--card-border-radius,16px);background:rgba(142,35,82,4%);text-align:center}.gift-gate__count{display:block;margin:.8rem 0 1.2rem;color:var(--gift-rose-deep);font-family:var(--code-font-family);font-size:3.6rem;font-weight:600;line-height:1.25;letter-spacing:.02em;font-variant-numeric:tabular-nums;font-feature-settings:'tnum'}.gift-gate__hint{margin:1rem 0 0;color:var(--card-text-color-secondary);font-size:1.3rem;line-height:1.8}.gift-quiz[hidden]{display:none}.gift-quiz:not([hidden]){animation:gift-fade-in 500ms ease both}.gift-quiz__lead{margin:0 0 2.4rem;color:var(--card-text-color-secondary);font-size:1.5rem;line-height:1.8}.gift-quiz__note{display:inline-block;margin:0 0 2.4rem;padding:.6rem 1.4rem;border:1px solid var(--gift-rose);border-radius:999px;background:var(--gift-rose-wash);color:var(--gift-rose-deep);font-size:1.3rem;line-height:1.6;font-weight:600;letter-spacing:.02em}[data-scheme=dark] .gift-quiz__note{border-color:rgba(255,143,184,.5);background:rgba(255,143,184,.12);color:#ffb6d0}.gift-questions{margin:0;padding:0;list-style:none}.gift-q{margin-bottom:2.4rem}.gift-q__label{display:flex;gap:1rem;align-items:flex-start;margin-bottom:.9rem;cursor:pointer}.gift-q__no{display:flex;flex:none;align-items:center;justify-content:center;width:2.6rem;height:2.6rem;color:#fff;background:linear-gradient(135deg,var(--gift-rose) 0%,var(--gift-rose-deep) 100%);border-radius:50%;font-size:1.3rem;font-weight:700;line-height:1;box-shadow:0 .3rem 1rem var(--gift-rose-wash)}.gift-q__text{padding-top:.2rem;font-size:1.5rem;line-height:1.6;font-weight:600}.gift-answer{margin-top:2.6rem;padding-top:2.6rem;border-top:1px dashed var(--card-separator-color)}.gift-answer__label{display:block;margin-bottom:1.2rem;color:var(--card-text-color-main);font-size:1.5rem;line-height:1.7;font-weight:600}.gift-answer__input{display:block;width:100%;min-height:6rem;padding:1.2rem 1.4rem;border:2px solid var(--card-separator-color);border-radius:1rem;background:var(--body-background);color:var(--card-text-color-main);font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:1.6rem;line-height:1.6;caret-color:var(--gift-rose-deep);outline:none;resize:vertical;transition:border-color .2s ease,box-shadow .2s ease}.gift-answer__input::placeholder{color:var(--card-text-color-tertiary);font-family:var(--base-font-family)}.gift-answer__input:focus{border-color:var(--gift-rose);box-shadow:0 0 0 3px var(--gift-rose-wash)}.gift-answer__hint{margin:.8rem 0 0;color:var(--card-text-color-tertiary);font-size:1.25rem;line-height:1.6}.gift-quiz__foot{display:flex;gap:1.4rem;align-items:center;margin-top:3rem}.gift-submit{flex:none;padding:1rem 2.8rem;border:0;border-radius:999px;color:#fff;background:linear-gradient(135deg,var(--gift-rose) 0%,var(--gift-rose-deep) 100%);font-family:inherit;font-size:1.5rem;font-weight:600;letter-spacing:.1em;cursor:pointer;box-shadow:0 .4rem 1.6rem var(--gift-rose-wash);transition:transform .2s ease,box-shadow .2s ease,opacity .2s ease}.gift-submit:hover{transform:translateY(-2px);box-shadow:0 .8rem 2.4rem rgba(209,65,124,.35)}.gift-submit:disabled{opacity:.55;cursor:progress;transform:none;box-shadow:none}.gift-quiz__msg{flex:auto;min-width:0;margin:0;color:var(--card-text-color-secondary);font-size:1.3rem;line-height:1.6}.gift-quiz__msg.is-error{color:#d9534f}@media(max-width:600px){.gift-hero__title{font-size:2.6rem}.gift-gate{padding:2.4rem 1.4rem}.gift-gate__count{font-size:3rem}.gift-quiz__foot{flex-direction:column;align-items:stretch;text-align:center}.gift-letter{padding:4rem 1.4rem}.gift-letter__paper{padding:3rem 2.2rem;border-radius:.8rem}.gift-letter__title{font-size:2.2rem}}@media(prefers-reduced-motion:reduce){.gift-envelope-wrap:not([hidden]),.gift-letter:not([hidden]),.gift-fallback:not([hidden]),.gift-quiz:not([hidden]){animation:none}.gift-envelope,.gift-envelope__seal,.gift-envelope__hint{animation:none}.gift-envelope__seal{transform:translate(-50%,-50%)}.gift-wishes{display:none}.gift-envelope.is-open .gift-envelope__seal{transform:translate(-50%,-50%)scale(.4)}.gift-envelope__flap,.gift-envelope__letter,.gift-submit,.gift-fallback__back{transition:none}.gift-letter__happy,.gift-cake__flame{animation:none}.gift-letter__happy{opacity:1;transform:none}}