:root{--paper: #F6F1E7;--paper-deep: #EDE4D3;--ink: #40372C;--ink-soft: #7A6E5D;--seal: #A4403A;--gold: #B08D57;--mist: #D9CFBD}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--paper);color:var(--ink);font-family:Hiragino Mincho ProN,Hiragino Mincho Pro,Yu Mincho,serif;font-size:17px;line-height:1.9;-webkit-font-smoothing:antialiased}button,input,textarea{font:inherit;color:var(--ink)}input,textarea{padding:10px 12px;border:1px solid var(--mist);border-radius:8px;background:#fff;width:100%}.app{position:relative;display:flex;flex-direction:column;height:100%;background:var(--app-bg, var(--paper))}.sky-layer{position:absolute;inset:0;overflow:hidden;pointer-events:none;z-index:0}:root[data-meteor=off] .sky-layer{display:none}.app:before{content:"";position:absolute;left:0;right:0;bottom:11%;height:min(74vh,136vw);background:url(/theme-seaside.jpg) center bottom / cover no-repeat;-webkit-mask-image:linear-gradient(to bottom,transparent 0%,#000 22%,#000 86%,transparent 100%);mask-image:linear-gradient(to bottom,transparent 0%,#000 22%,#000 86%,transparent 100%);pointer-events:none;z-index:0;display:none}:root[data-illust=on] .app:before{display:block}:root[data-illust=on] .sky-layer{bottom:auto;height:42%}.demo-banner,.shell{position:relative;z-index:1}.sky-comet-band{position:absolute;width:150%;height:120px;left:-20%;top:16%;transform:rotate(-24deg);background:linear-gradient(90deg,#fff0,#fff6df2e 30%,#ffffff57,#fff6df29 80%,#fff0);filter:blur(6px);animation:sky-band-glow 14s ease-in-out infinite}.sky-star{position:absolute;width:3px;height:3px;background:#fff;border-radius:50%;box-shadow:0 0 6px 1px #ffffffe6;animation-name:sky-twinkle;animation-timing-function:ease-in-out;animation-iteration-count:infinite}.sky-star--s{width:2px;height:2px;box-shadow:0 0 4px 1px #fff9}.sky-star--gold{background:#fff3d6;box-shadow:0 0 7px 2px #ffe4a0e6}.sky-meteor{position:absolute;height:2px;border-radius:2px;opacity:0;background:linear-gradient(90deg,#fff0,#fffffff2 85%,#fff);box-shadow:0 0 8px 1px #ffffff8c;animation-name:sky-shoot;animation-timing-function:linear;animation-iteration-count:infinite}.sky-meteor:after{content:"";position:absolute;right:-3px;top:-2px;width:6px;height:6px;border-radius:50%;background:#fff;box-shadow:0 0 10px 3px #fffffff2,0 0 20px 6px #ffd6a580}.sky-meteor--gold{background:linear-gradient(90deg,#ffe3aa00,#ffebbef2 85%,#fff6df);box-shadow:0 0 8px 1px #ffdc9699}.sky-meteor--gold:after{background:#fff6df;box-shadow:0 0 10px 3px #ffecbef2,0 0 22px 8px #ffc88c80}@keyframes sky-twinkle{0%,to{opacity:.15}50%{opacity:.9}}@keyframes sky-band-glow{0%,to{opacity:.55}50%{opacity:1}}@keyframes sky-shoot{0%{transform:rotate(148deg) translate(-80px);opacity:0}6%{opacity:1}22%{transform:rotate(148deg) translate(240px);opacity:0}to{transform:rotate(148deg) translate(240px);opacity:0}}@media(prefers-reduced-motion:reduce){.sky-layer *{animation:none!important}.sky-star{opacity:.6}.sky-meteor{opacity:.4;transform:rotate(148deg)}}.demo-banner{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:6px 12px;padding-top:calc(6px + env(safe-area-inset-top));font-size:13px;background:var(--ink);color:var(--paper)}.demo-banner button{font-size:13px;padding:4px 10px;border:1px solid var(--paper);border-radius:6px;background:none;color:var(--paper);width:auto}.screen{padding:20px 20px calc(24px + env(safe-area-inset-bottom))}.screen--center{min-height:100%;display:flex;align-items:center;justify-content:center}.screen__title{font-size:20px;font-weight:600;margin:0 0 8px}.screen__subtitle{font-size:15px;font-weight:600;color:var(--ink-soft);margin:20px 0 8px}.screen__note{color:var(--ink-soft)}.screen__note--small{font-size:13px;margin-top:-4px}.screen__toolbar{display:flex;justify-content:flex-end;margin:-8px -8px 0 0}.anniversary{text-align:center;font-size:14px;color:var(--gold);margin-bottom:12px}.anniversary p{margin:0}.anniversary--today{font-size:16px;font-weight:600}.login{display:flex;flex-direction:column;gap:16px;width:min(320px,80vw);text-align:center}.login__logo{font-size:24px;font-weight:600;letter-spacing:.12em;margin:0 0 8px}.login__label{color:var(--ink-soft);font-size:15px}.login input{text-align:center;padding:12px}.login button{font-size:16px;padding:12px;border:none;border-radius:8px;background:var(--seal);color:#fff}.login button:disabled{opacity:.5}.login__error{color:var(--seal);font-size:15px;margin:0}.btn{display:inline-block;padding:12px 16px;border:none;border-radius:8px;width:auto}.btn--seal{background:var(--seal);color:#fff}.btn--ghost{background:none;color:var(--ink-soft);text-decoration:underline;text-underline-offset:4px}.btn--small{padding:8px 12px;font-size:14px}.btn:disabled{opacity:.5}.envelope-card{display:flex;align-items:center;gap:12px;width:100%;text-align:left;padding:16px;margin-bottom:10px;border:1px solid var(--mist);border-radius:12px;background:var(--paper-deep)}.envelope-card--opened{background:#fff}.envelope-card__icon{font-size:24px}.envelope-card__text{flex:1;display:flex;flex-direction:column}.envelope-card__title{font-weight:600}.envelope-card__meta{font-size:13px;color:var(--ink-soft)}.envelope-card__seal{color:var(--seal);font-size:18px}.presence{margin-top:20px;font-size:14px;color:var(--ink-soft);text-align:center}.modal{position:fixed;inset:0;z-index:10;background:var(--paper);overflow-y:auto;display:flex;flex-direction:column}.modal__envelope{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:16px;padding:24px}.modal__body{display:flex;flex-direction:column;gap:16px;padding:32px 20px calc(32px + env(safe-area-inset-bottom));max-width:480px;width:100%;margin:0 auto}.modal__from{color:var(--ink-soft);font-size:14px;margin:0;text-align:center}.modal__kind{color:var(--ink-soft);font-size:14px;margin:0}.modal__hint{color:var(--ink-soft);font-size:14px;text-align:center;margin:0}.modal__close{align-self:center}.envelope-art{font-size:72px;line-height:1}.letter-paper{background:#fff;border:1px solid var(--mist);border-radius:8px;padding:24px 20px;font-size:19px;line-height:1.9}.letter-paper p{margin:0}.letter-photo{display:block;width:100%;margin-top:14px;border-radius:6px;border:1px solid var(--mist)}.photo-field{display:flex;flex-direction:column;gap:8px;align-items:flex-start}.photo-field__img{max-width:100%;max-height:220px;border-radius:8px;border:1px solid var(--mist)}.theme-picker{background:var(--app-bg, var(--paper))}.swatch-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.swatch{width:100%;aspect-ratio:1;border:2px solid rgba(255,255,255,.7);border-radius:50%;padding:0;box-shadow:0 1px 3px #40372c33}.swatch--active{border-color:var(--ink)}.swatch-name{font-size:14px;color:var(--ink-soft);text-align:center;margin:0}.result{border-radius:8px;padding:16px;text-align:center}.result--success{background:#fff;border:1px solid var(--gold)}.result--fail{background:#fff;border:1px solid var(--mist)}.result__title{font-weight:600;margin:0 0 8px}.result p{margin:0}.reply{display:flex;flex-direction:column;gap:10px}.gimmick-card{background:#fff;border:1px solid var(--mist);border-radius:12px;padding:14px 16px;margin-bottom:10px}.gimmick-card__head{display:flex;justify-content:space-between;align-items:center}.gimmick-card__type{font-size:13px;color:var(--ink-soft)}.gimmick-card__title{font-weight:600;margin:4px 0 0}.gimmick-card__memo{font-size:13px;color:var(--ink-soft);margin:2px 0 0}.gimmick-card__meta{font-size:13px;color:var(--ink-soft);margin:4px 0 0}.gimmick-card__reply{font-size:14px;color:var(--ink);background:var(--paper);border-radius:8px;padding:8px 12px;margin:8px 0 0}.gimmick-card__actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}.badge{font-size:12px;padding:2px 10px;border-radius:999px;border:1px solid var(--mist);color:var(--ink-soft)}.badge--released,.badge--opened,.badge--replied{border-color:var(--seal);color:var(--seal)}.badge--scheduled{border-color:var(--gold);color:var(--gold)}.fab{width:100%;margin-top:16px}.form{display:flex;flex-direction:column;gap:8px}.form__label{font-size:13px;color:var(--ink-soft);margin-top:10px}.form__hint{font-size:13px;color:var(--ink-soft);margin:4px 0 0}.form__error{color:var(--seal);font-size:14px;margin:8px 0 0}.form__actions{display:flex;flex-direction:column;gap:8px;margin-top:16px}.type-picker{display:flex;gap:6px;flex-wrap:wrap}.type-picker__item{padding:8px 12px;font-size:14px;border:1px solid var(--mist);border-radius:999px;background:none;color:var(--ink-soft);width:auto}.type-picker__item--active{border-color:var(--seal);color:var(--seal);font-weight:600}.shell{display:flex;flex-direction:column;flex:1;min-height:0}.shell__main{flex:1;overflow-y:auto}.tabbar{display:flex;border-top:1px solid var(--mist);background:var(--paper-deep);padding-bottom:env(safe-area-inset-bottom)}.tabbar__item{flex:1;font-size:13px;padding:12px 0;border:none;background:none;color:var(--ink-soft);width:auto}.tabbar__item--active{color:var(--seal);font-weight:600}