:root{color-scheme:dark;--app-height: 100vh;--ink: #fff8ec;--muted: #f4d8c2;--rose: #f49ab5;--rose-deep: #c94c74;--gold: #ffd889}*{box-sizing:border-box}html,body,#app{width:100%;min-height:100%;margin:0}body{overflow:hidden;min-height:var(--app-height);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;font-family:PingFang SC,Hiragino Sans GB,Microsoft YaHei,Noto Sans CJK SC,system-ui,sans-serif;background:radial-gradient(ellipse at 50% 104%,rgba(255,176,117,.28),transparent 34%),radial-gradient(circle at 18% 18%,rgba(244,154,181,.18),transparent 30%),radial-gradient(circle at 86% 24%,rgba(255,216,137,.16),transparent 28%),linear-gradient(145deg,#100a15,#251126 45%,#4a202c);color:var(--ink)}button{font:inherit}.stage{position:relative;width:100vw;height:var(--app-height);min-height:100svh;isolation:isolate;overflow:hidden}.stage:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;z-index:1;pointer-events:none;background:linear-gradient(180deg,#120d1814,#692d2f33),radial-gradient(ellipse at 50% 48%,transparent 0%,rgba(9,7,12,.4) 82%)}.stage:after{content:"";position:absolute;inset:auto -12% -34% -12%;z-index:1;height:58vh;pointer-events:none;background:linear-gradient(90deg,transparent,rgba(255,216,137,.18),transparent),radial-gradient(ellipse at center,rgba(244,154,181,.2),transparent 68%);filter:blur(12px);animation:horizonGlow 7s ease-in-out infinite alternate}.stars,.particles,.petals,.silk-ribbons,.light-beams{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%}.stars{z-index:0}.particles{z-index:2;mix-blend-mode:screen}.silk-ribbons{z-index:1;overflow:hidden;pointer-events:none;mix-blend-mode:screen}.ribbon{position:absolute;left:-18vw;width:136vw;height:18vh;border-radius:50%;opacity:.46;filter:blur(7px);transform-origin:center}.ribbon-one{top:18vh;background:linear-gradient(90deg,transparent,rgba(255,216,137,.34),rgba(244,154,181,.22),transparent);animation:ribbonDrift 10s ease-in-out infinite alternate}.ribbon-two{top:42vh;background:linear-gradient(90deg,transparent,rgba(255,248,236,.16),rgba(255,191,146,.24),transparent);animation:ribbonDrift 13s ease-in-out -2s infinite alternate-reverse}.ribbon-three{top:66vh;background:linear-gradient(90deg,transparent,rgba(244,154,181,.2),rgba(255,216,137,.18),transparent);animation:ribbonDrift 15s ease-in-out -4s infinite 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18px;color:var(--gold);font-size:.8rem;line-height:1.2;letter-spacing:.22em;text-transform:uppercase;text-shadow:0 0 22px rgba(255,216,137,.48)}h1{max-width:880px;margin:0;font-size:clamp(2.45rem,7vw,6.5rem);line-height:1.04;font-weight:800;letter-spacing:0;text-wrap:balance;background:linear-gradient(180deg,#fffaf0,#ffd889 42%,#f49ab5);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 0 14px rgba(255,216,137,.24),0 0 34px rgba(244,154,181,.32),0 16px 42px rgba(0,0,0,.52);animation:titleRise 1.2s cubic-bezier(.2,.9,.2,1) both}.subtitle{max-width:680px;margin:24px auto 0;color:var(--muted);font-size:clamp(1rem,2.4vw,1.34rem);line-height:1.9;text-wrap:balance;text-shadow:0 0 18px rgba(255,216,137,.12);animation:titleRise 1.2s cubic-bezier(.2,.9,.2,1) .16s both}.actions{display:flex;align-items:center;justify-content:center;gap:16px;margin-top:42px}.primary-button,.icon-button{border:1px solid rgba(255,216,137,.48);background:linear-gradient(135deg,#ffd889f5,#f49ab5f5);color:#2b1018;box-shadow:0 18px 60px #c94c746b,0 0 36px #ffd8892e,inset 0 1px #ffffff9e;cursor:pointer;transition:transform .22s ease,box-shadow .22s ease,filter .22s ease}.primary-button:before{content:"";position:absolute;top:2px;right:2px;bottom:2px;left:2px;border-radius:inherit;background:linear-gradient(90deg,transparent,rgba(255,255,255,.58),transparent);opacity:0;transform:translate(-42%);transition:opacity .22s ease,transform .52s ease}.primary-button{position:relative;overflow:hidden;min-height:54px;padding:0 26px;border-radius:999px;font-weight:750}.icon-button{display:grid;width:54px;height:54px;place-items:center;border-radius:50%;font-size:1.25rem}.primary-button:hover,.icon-button:hover{transform:translateY(-3px) scale(1.02);filter:saturate(1.08);box-shadow:0 24px 82px #f49ab575,0 0 26px #ffd8893d}.primary-button:hover:before{opacity:.7;transform:translate(42%)}.primary-button:active,.icon-button:active{transform:translateY(0) scale(.99)}.ambient-note{position:absolute;left:50%;bottom:28px;z-index:4;width:min(680px,calc(100vw - 36px));transform:translate(-50%);color:#fff8ecc7;font-size:.95rem;line-height:1.7;text-align:center;transition:opacity .9s ease,transform .9s ease,filter .9s ease}.ambient-note span{display:inline-block;padding:10px 16px;border:1px solid rgba(255,248,236,.14);border-radius:999px;background:#180d1547;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.final-blessing{position:absolute;top:0;right:0;bottom:0;left:0;z-index:5;display:grid;place-items:center;pointer-events:none;text-align:center;animation:finalLayerIn .8s ease both}.final-blessing p{position:absolute;top:calc(50% - min(18vw,190px));margin:0;color:#fff8ecd1;font-size:clamp(.95rem,2.4vw,1.22rem);line-height:1.8;text-shadow:0 0 28px rgba(255,216,137,.46);animation:finalWhisper 1.1s ease .45s both}.final-blessing strong{display:block;padding-inline:20px;max-width:min(920px,calc(100vw - 28px));color:#fff8ec;font-size:clamp(3.4rem,12vw,10rem);line-height:1;font-weight:900;letter-spacing:0;overflow-wrap:anywhere;background:linear-gradient(180deg,#fff,#ffe59f 42%,#f49ab5);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;text-shadow:0 0 16px rgba(255,248,236,.36),0 0 46px rgba(255,216,137,.5),0 0 82px rgba(244,154,181,.34);filter:drop-shadow(0 22px 42px rgba(0,0,0,.52));animation:finalTextIn 1.2s cubic-bezier(.16,1,.3,1) both}.petal{position:absolute;top:-10vh;width:var(--size);height:calc(var(--size) * 1.42);border-radius:84% 16% 72% 28%/70% 26% 74% 30%;background:radial-gradient(circle at 32% 25%,rgba(255,255,255,.88),transparent 26%),linear-gradient(155deg,#ffd7d6f0,#f49ab5d1 52%,#d35d70b8);box-shadow:0 0 16px #f49ab529;opacity:var(--alpha);animation:fall var(--duration) linear var(--delay) infinite}@keyframes fall{0%{transform:translate3d(var(--start),-12vh,0) rotate(0)}45%{transform:translate3d(calc(var(--start) + var(--drift)),46vh,0) rotate(190deg)}to{transform:translate3d(calc(var(--start) + var(--drift) * -.35),112vh,0) rotate(390deg)}}.dialog{position:fixed;top:0;right:0;bottom:0;left:0;z-index:10;display:grid;place-items:center;padding:max(18px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) max(18px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left))}.dialog-backdrop{position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 50% 42%,rgba(255,216,137,.16),transparent 30%),#0a070cad;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);animation:fadeIn .36s ease both}.letter-scene{position:relative;z-index:1;width:min(720px,calc(100vw - 32px));max-height:min(760px,calc(var(--app-height) - 36px));max-height:min(760px,calc(100svh - 36px));display:grid;place-items:center;perspective:1200px;animation:letterIn .5s cubic-bezier(.2,.9,.2,1) both}.envelope{position:absolute;z-index:3;display:grid;width:min(500px,calc(100vw - 54px));aspect-ratio:1.58;place-items:center;border:0;background:transparent;cursor:pointer;transform-style:preserve-3d;animation:envelopeFloat 2.6s ease-in-out infinite alternate}.envelope-glow{position:absolute;top:-24%;right:-24%;bottom:-24%;left:-24%;border-radius:50%;background:radial-gradient(circle,rgba(255,216,137,.34),transparent 58%),radial-gradient(circle at 72% 30%,rgba(244,154,181,.22),transparent 42%);filter:blur(14px);opacity:.88}.envelope-back,.envelope-front,.envelope-flap,.envelope-letter-preview,.envelope-stamp,.envelope-address,.envelope-postmark{position:absolute}.envelope-back{top:0;right:0;bottom:0;left:0;overflow:hidden;border:1px solid rgba(164,96,75,.28);border-radius:10px;background:radial-gradient(circle at 18% 18%,rgba(255,255,255,.78),transparent 22%),radial-gradient(circle at 82% 72%,rgba(244,154,181,.16),transparent 34%),repeating-linear-gradient(32deg,rgba(116,62,54,.024) 0 1px,transparent 1px 8px),linear-gradient(145deg,#fff2dc,#ffd9bf 46%,#f4a4b7);box-shadow:0 28px 80px #0000006b,0 0 48px #ffd88947,inset 0 1px #ffffffb8,inset 0 -18px 36px #9746531f}.envelope-back:before{content:"";position:absolute;top:13px;right:13px;bottom:13px;left:13px;border:1px solid rgba(164,96,75,.18);border-radius:7px;pointer-events:none}.envelope-back:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:linear-gradient(28deg,transparent 49.5%,rgba(133,70,67,.16) 50%,transparent 50.5%),linear-gradient(152deg,transparent 49.5%,rgba(133,70,67,.16) 50%,transparent 50.5%),linear-gradient(180deg,transparent 61%,rgba(255,255,255,.2) 61.4%,transparent 62%);opacity:.82;pointer-events:none}.envelope-letter-preview{inset:9% 9% auto;height:72%;border-radius:7px 7px 3px 3px;background:linear-gradient(180deg,#fffdf4f5,#ffe9d9f5),repeating-linear-gradient(0deg,transparent 0 18px,rgba(201,76,116,.08) 19px 20px);transform:translateY(26%);transition:transform .78s cubic-bezier(.16,1,.3,1),opacity .42s ease}.envelope-flap{top:0;right:0;bottom:0;left:0;border-radius:10px;transform-origin:top center;clip-path:polygon(0 0,100% 0,50% 64%);background:linear-gradient(180deg,rgba(255,255,255,.56),transparent 38%),repeating-linear-gradient(30deg,rgba(116,62,54,.02) 0 1px,transparent 1px 7px),linear-gradient(180deg,#fff3dc,#ffc8b8 52%,#ee86a5);box-shadow:inset 0 -1px #ffffff80,0 8px 16px #5f26321f;transition:transform .78s cubic-bezier(.16,1,.3,1)}.envelope-front{top:0;right:0;bottom:0;left:0;border-radius:10px;clip-path:polygon(0 38%,50% 68%,100% 38%,100% 100%,0 100%);background:linear-gradient(32deg,transparent 49.6%,rgba(119,62,58,.2) 50%,transparent 50.4%),linear-gradient(148deg,transparent 49.6%,rgba(119,62,58,.2) 50%,transparent 50.4%),radial-gradient(circle at 50% 28%,rgba(255,255,255,.36),transparent 20%),linear-gradient(160deg,#ffe0c9,#f4a0b4 58%,#cc5d7e);box-shadow:inset 0 1px #ffffff70}.envelope-front:after{content:"";position:absolute;inset:auto 18px 16px;height:1px;background:linear-gradient(90deg,transparent,rgba(255,248,236,.5),transparent);opacity:.72}.envelope-stamp{top:30px;right:34px;z-index:4;display:grid;width:76px;height:60px;place-items:center;border:1px solid rgba(180,82,102,.34);border-radius:4px;background:radial-gradient(circle at 50% 36%,rgba(255,255,255,.8),transparent 26%),linear-gradient(145deg,#fff8ecf5,#ffcacfeb);color:#9f294a;font-size:.82rem;font-weight:800;box-shadow:0 6px 12px #5f26321f,inset 0 0 0 4px #ffffff6b}.envelope-stamp:before{content:"";position:absolute;top:-4px;right:-4px;bottom:-4px;left:-4px;background:radial-gradient(circle,transparent 4px,rgba(180,82,102,.28) 4.5px,transparent 5px) 0 0 / 12px 12px;pointer-events:none}.envelope-address{left:42px;top:78px;z-index:4;display:grid;gap:12px;width:56%;color:#4f1f2ac2;font-size:clamp(.84rem,1.4vw,1rem);font-weight:700;text-align:left}.envelope-address span{display:block;padding-bottom:7px;border-bottom:1px solid rgba(137,72,65,.28)}.envelope-postmark{top:86px;right:72px;z-index:5;width:88px;height:42px;border:2px solid rgba(143,65,78,.22);border-left-color:transparent;border-radius:50%;transform:rotate(-16deg)}.envelope-postmark:before,.envelope-postmark:after{content:"";position:absolute;right:-34px;width:68px;height:1px;background:#8f414e33}.envelope-postmark:before{top:13px}.envelope-postmark:after{top:23px}.wax-seal{position:absolute;z-index:4;display:grid;width:64px;height:64px;left:calc(50% - 32px);top:calc(58% - 32px);place-items:center;border-radius:50%;background:radial-gradient(circle at 34% 24%,rgba(255,255,255,.38),transparent 24%),linear-gradient(145deg,#e05278,#9f294a);color:#fff8ec;font-size:1.32rem;font-weight:800;box-shadow:0 10px 24px #70143061,inset 0 1px #ffffff52;transition:transform .56s ease,opacity .36s ease}.envelope-open .envelope{pointer-events:none;animation:envelopeOpenOut 1.05s cubic-bezier(.16,1,.3,1) forwards}.envelope-open .envelope-flap{transform:rotateX(178deg)}.envelope-open .envelope-letter-preview{transform:translateY(-38%);opacity:0}.envelope-open .envelope-stamp,.envelope-open .envelope-address,.envelope-open .envelope-postmark{opacity:0;transition:opacity .28s ease}.envelope-open .wax-seal{opacity:0;transform:scale(.72) translateY(18px)}.letter{position:relative;z-index:2;width:100%;max-height:inherit;-webkit-overflow-scrolling:touch;overflow:auto;padding:clamp(28px,5vw,52px);border:1px solid rgba(255,216,137,.38);border-radius:8px;background:radial-gradient(circle at 8% 0%,rgba(255,255,255,.82),transparent 19%),linear-gradient(145deg,#fff8ecf5,#ffe6d6f5),repeating-linear-gradient(0deg,transparent 0 35px,rgba(201,76,116,.08) 36px 37px);color:#3a1820;box-shadow:0 30px 100px #00000075,0 0 46px #ffd88938,0 0 82px #f49ab524;opacity:0;transform:translateY(44px) rotateX(7deg) scale(.94);transition:opacity .62s ease,transform .82s cubic-bezier(.16,1,.3,1)}.envelope-open .letter{opacity:1;transform:translateY(0) rotateX(0) scale(1)}.letter:before{content:"";position:absolute;top:14px;right:14px;bottom:14px;left:14px;border:1px solid rgba(154,93,67,.16);border-radius:6px;pointer-events:none}.letter:after{content:"";position:absolute;inset:auto 10% 20px;height:1px;background:linear-gradient(90deg,transparent,rgba(201,76,116,.38),transparent);pointer-events:none}.letter-scene.letter-leaving{animation:letterLeave 1.25s cubic-bezier(.7,0,.84,0) forwards}.letter-scene.letter-leaving .letter{animation:paperSeal .96s cubic-bezier(.7,0,.84,0) forwards}.letter-scene.letter-leaving .envelope{animation:envelopeSeal 1.1s cubic-bezier(.16,1,.3,1) forwards}.letter-date{margin:0 0 10px;color:#9a5d43;font-size:.92rem}.letter h2{margin:0 0 22px;font-size:clamp(2rem,6vw,3.6rem);line-height:1.1;letter-spacing:0}.letter-text{min-height:260px;white-space:pre-wrap;color:#45202a;font-size:clamp(1.04rem,2.2vw,1.2rem);line-height:2.08}.letter-cursor{display:inline-block;width:9px;height:1.2em;margin-left:3px;transform:translateY(4px);background:var(--rose-deep);animation:blink .76s steps(2,start) infinite}.seal-letter-button{display:block;min-height:48px;margin:28px auto 0;padding:0 22px;border:1px solid rgba(201,76,116,.26);border-radius:999px;background:linear-gradient(135deg,#ffd889,#f49ab5);color:#3a1820;font-weight:750;box-shadow:0 14px 34px #c94c7438,inset 0 1px #ffffff8f;cursor:pointer;animation:sealButtonIn .62s cubic-bezier(.16,1,.3,1) both;transition:transform .18s ease,box-shadow .18s ease}.seal-letter-button:hover{transform:translateY(-2px);box-shadow:0 18px 42px #c94c7447,0 0 22px #ffd88933}.seal-letter-button:active{transform:translateY(0) scale(.98)}.close-button{position:absolute;top:14px;right:14px;z-index:6;display:grid;width:36px;height:36px;place-items:center;border:1px solid rgba(201,76,116,.22);border-radius:50%;background:#ffffff6b;color:#5b2630;font-size:1.4rem;line-height:1;cursor:pointer}@keyframes fadeIn{0%{opacity:0}}@keyframes letterIn{0%{opacity:0;transform:translateY(24px) scale(.97)}}@keyframes envelopeFloat{0%{transform:translateY(7px) rotate(-.8deg)}to{transform:translateY(-8px) rotate(.8deg)}}@keyframes envelopeOpenOut{0%{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}62%{opacity:.72;transform:translateY(24px) scale(.96)}to{opacity:0;transform:translateY(64px) scale(.88);filter:blur(8px)}}@keyframes envelopeSeal{0%{opacity:0;transform:translateY(54px) scale(.88);filter:blur(8px)}42%{opacity:.9;transform:translateY(10px) scale(.96);filter:blur(0)}to{opacity:0;transform:translateY(-18px) scale(.74);filter:blur(10px)}}@keyframes paperSeal{0%{opacity:1;transform:translateY(0) rotateX(0) scale(1)}72%{opacity:.75;transform:translateY(58px) rotateX(8deg) scale(.86)}to{opacity:0;transform:translateY(86px) rotateX(12deg) scale(.72)}}@keyframes sealButtonIn{0%{opacity:0;transform:translateY(12px);filter:blur(8px)}}@keyframes blink{50%{opacity:0}}@keyframes horizonGlow{0%{opacity:.5;transform:translateY(0) scaleX(.94)}to{opacity:.95;transform:translateY(-10px) scaleX(1.04)}}@keyframes ribbonDrift{0%{transform:translate3d(-4vw,0,0) rotate(-9deg) scaleY(.72)}to{transform:translate3d(5vw,-4vh,0) rotate(7deg) scaleY(1)}}@keyframes beamsBreathe{0%{opacity:.32;transform:scale(1)}to{opacity:.68;transform:scale(1.04)}}@keyframes titleRise{0%{opacity:0;transform:translateY(18px);filter:blur(10px)}}@keyframes finalLayerIn{0%{opacity:0}}@keyframes finalWhisper{0%{opacity:0;transform:translateY(16px);filter:blur(10px)}}@keyframes finalTextIn{0%{opacity:0;transform:scale(.82) translateY(30px);filter:blur(18px) drop-shadow(0 22px 42px rgba(0,0,0,.52))}58%{opacity:1;transform:scale(1.06) translateY(0);filter:blur(0) drop-shadow(0 22px 42px rgba(0,0,0,.52))}to{opacity:1;transform:scale(1)}}@keyframes letterLeave{0%{opacity:1;transform:translateY(0) scale(1);filter:blur(0)}to{opacity:0;transform:translateY(-42px) scale(.82);filter:blur(14px)}}@media (max-width: 720px){body{touch-action:manipulation}.stage:after{height:44svh;filter:blur(8px)}.hero{width:min(100vw - 28px,620px);padding:max(42px,env(safe-area-inset-top)) 0 max(86px,env(safe-area-inset-bottom));justify-content:center}.kicker{margin-bottom:14px;font-size:.72rem;letter-spacing:.14em}h1{max-width:11em;font-size:clamp(2.2rem,11vw,4.2rem);line-height:1.08}.subtitle{max-width:24em;margin-top:18px;font-size:clamp(.95rem,4vw,1.08rem);line-height:1.75}.actions{width:100%;gap:12px;margin-top:30px}.primary-button{flex:1;min-width:0;padding-inline:18px;font-size:.98rem}.icon-button{width:50px;height:50px;flex:0 0 50px}.ambient-note{bottom:16px;font-size:.86rem}.ribbon{filter:blur(4px);opacity:.34}.light-beams{opacity:.48}.dialog{align-items:center}.dialog-backdrop{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.letter{width:min(100%,calc(100vw - 24px));max-height:calc(var(--app-height) - 24px);max-height:calc(100svh - 24px);padding:28px 20px 30px}.letter-scene{width:min(100%,calc(100vw - 24px));max-height:calc(var(--app-height) - 24px);max-height:calc(100svh - 24px)}.envelope{width:min(340px,calc(100vw - 48px))}.envelope-address{left:28px;top:58px;gap:8px;width:54%;font-size:.78rem}.envelope-address span{padding-bottom:5px}.envelope-stamp{top:22px;right:24px;width:58px;height:46px;font-size:.68rem}.envelope-postmark{top:66px;right:46px;width:62px;height:30px}.envelope-postmark:before,.envelope-postmark:after{right:-26px;width:48px}.envelope-postmark:before{top:9px}.envelope-postmark:after{top:17px}.wax-seal{width:52px;height:52px;left:calc(50% - 26px);top:calc(60% - 26px);font-size:1.1rem}.letter:before{top:10px;right:10px;bottom:10px;left:10px}.letter h2{margin-bottom:16px;font-size:clamp(1.8rem,9vw,2.7rem)}.letter-text{min-height:220px;font-size:clamp(.96rem,4vw,1.06rem);line-height:1.9}.seal-letter-button{width:min(100%,260px);min-height:46px;margin-top:22px;font-size:.96rem}.final-blessing p{top:calc(50% - 118px);width:calc(100vw - 36px)}.final-blessing strong{max-width:6em;font-size:clamp(3.1rem,17vw,5.6rem);line-height:1.08}}@media (max-width: 720px) and (orientation: landscape){.hero{padding-top:max(20px,env(safe-area-inset-top));padding-bottom:max(20px,env(safe-area-inset-bottom))}.kicker,.ambient-note{display:none}h1{max-width:18em;font-size:clamp(1.8rem,6.4vw,3.2rem)}.subtitle{margin-top:12px;font-size:.92rem;line-height:1.55}.actions{margin-top:20px}.letter{max-height:calc(var(--app-height) - 18px);max-height:calc(100svh - 18px);padding:22px 24px}.letter-scene{max-height:calc(var(--app-height) - 18px);max-height:calc(100svh - 18px)}.envelope{width:min(300px,46vw)}.envelope-address{top:48px;gap:6px;font-size:.66rem}.envelope-stamp{top:16px;right:20px;width:50px;height:38px;font-size:.6rem}.envelope-postmark{display:none}.letter-text{min-height:130px;line-height:1.7}.seal-letter-button{min-height:40px;margin-top:16px}.final-blessing strong{max-width:none;font-size:clamp(2.8rem,10vw,5.4rem)}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{scroll-behavior:auto!important;animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}