:root{--wine:#781f24;--wine-deep:#501519;--gold:#b48956;--paper:#f3e4c8;--ink:#342521}*{box-sizing:border-box}html,body{min-height:100%;margin:0}body{color:var(--ink);background:#241719;font-family:Songti SC,STSong,SimSun,serif}button{font:inherit}.invitation-shell{background:#241719;min-height:100svh;overflow:hidden}.cover{z-index:10;min-height:100svh;color:var(--wine-deep);background:radial-gradient(circle at 20% 12%, #ffffff70, transparent 24%), radial-gradient(circle at 84% 78%, #894b2f1a, transparent 28%), repeating-linear-gradient(0deg, transparent 0 3px, #5f392405 3px 4px), var(--paper);flex-direction:column;justify-content:center;align-items:center;padding:32px 22px 28px;transition:opacity .8s .45s,visibility .8s .45s;display:flex;position:fixed;inset:0}.cover:before,.cover:after{content:"";pointer-events:none;border:1px solid #781f2494;position:absolute;inset:14px}.cover:after{border-color:#b489568a;inset:19px}.cover-kicker{letter-spacing:.31em;margin:0 0 9px;font-family:Georgia,Times New Roman,serif;font-size:12px}.cover h1{text-align:center;letter-spacing:.18em;margin:0;font-size:clamp(36px,10vw,54px);font-weight:500;line-height:1.3}.cover h1 span{letter-spacing:.28em}.couple-names{letter-spacing:.2em;margin:12px 0 32px;font-size:17px}.couple-names i{color:var(--gold);margin:0 7px;font-family:Georgia,serif}.envelope{aspect-ratio:1.56;cursor:pointer;perspective:900px;background:#d8b58b;border:1px solid #9c6b49;border-radius:2px;width:min(76vw,306px);padding:0;position:relative;overflow:visible;box-shadow:0 18px 40px #40191438}.envelope:before,.envelope:after{content:"";z-index:3;pointer-events:none;background:linear-gradient(32deg,#d5ae81 0 49.5%,#0000 50%);position:absolute;inset:0}.envelope:after{background:linear-gradient(-32deg,#cfaa7f 0 49.5%,#0000 50%)}.envelope-flap{z-index:5;transform-origin:top;clip-path:polygon(0 0,100% 0,50% 100%);background:#e2c49f;width:calc(100% + 2px);height:58%;transition:transform .7s cubic-bezier(.3,.7,.2,1);position:absolute;top:-1px;left:-1px}.envelope-letter{z-index:2;height:80%;color:var(--wine);background:#f7ead2;border:1px solid #781f244d;place-content:center;gap:7px;transition:transform .8s .18s;display:grid;position:absolute;bottom:7%;left:8%;right:8%}.envelope-letter b{font-size:42px;font-weight:500}.envelope-letter small{letter-spacing:.2em;font-size:12px}.seal{z-index:6;color:#f2d3a3;background:var(--wine);border:1px solid #ffe8bb75;border-radius:50%;place-items:center;width:47px;height:47px;transition:opacity .25s;display:grid;position:absolute;top:47%;left:50%;transform:translate(-50%,-50%);box-shadow:0 4px 10px #48111142}.open-hint{letter-spacing:.3em;margin:26px 0 0;font-size:13px;animation:1.8s ease-in-out infinite breathe}.cover-ornament{color:var(--gold);font-size:26px;position:absolute}.cover-ornament-top{top:43px}.cover-ornament-bottom{bottom:40px;transform:rotate(180deg)}.invitation-stage{min-height:100svh;padding:max(12px, env(safe-area-inset-top)) 0 max(12px, env(safe-area-inset-bottom));background:radial-gradient(circle at 50% 35%, #fff6e017, transparent 46%), var(--wine-deep);justify-content:center;align-items:center;display:flex}.invitation-card{opacity:0;filter:blur(2px);width:min(100%,540px);height:auto;display:block;transform:translateY(34px)scale(.985);box-shadow:0 18px 50px #1f080a57}.music-toggle{z-index:20;color:#f7e7c7;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#430d12b8;border:1px solid #ffecc77a;border-radius:50%;width:42px;height:42px;position:fixed;top:20px;right:20px}.music-toggle.is-playing{animation:4s linear infinite spin}.is-open .envelope-flap{transform:rotateX(180deg)}.is-open .envelope-letter{transform:translateY(-72%)}.is-open .seal{opacity:0}.is-open .cover{opacity:0;visibility:hidden}.is-open .invitation-card{animation:1.05s cubic-bezier(.2,.72,.18,1) .48s both invitation-enter}@keyframes breathe{50%{opacity:.48;transform:translateY(3px)}}@keyframes spin{to{transform:rotate(360deg)}}@keyframes invitation-enter{to{opacity:1;filter:blur();transform:translateY(0)scale(1)}}@media (prefers-reduced-motion:reduce){*,:before,:after{transition-duration:.01ms!important;animation:none!important}}