*{box-sizing:border-box}:root{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;line-height:1.6;font-weight:400;color:#333;background-color:#fff;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}body{margin:0;padding:0;min-width:320px;min-height:100vh}#root{min-height:100vh}h1,h2,h3,h4,h5,h6,p{margin:0;padding:0}button{font-family:inherit;cursor:pointer}button:focus{outline:none}button:focus-visible{outline:2px solid #FF69B4;outline-offset:2px}.letter-card{background:linear-gradient(135deg,#ffe4e1,pink);border-radius:15px;padding:20px;text-align:center;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 15px #0000001a;position:relative;overflow:hidden;min-height:180px;display:flex;flex-direction:column;justify-content:space-between}.letter-card:before{content:"";position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(255,255,255,.3) 0%,transparent 70%);opacity:0;transition:opacity .3s ease}.letter-card:hover:before{opacity:1}.letter-card.unlocked:hover{transform:translateY(-5px) scale(1.02);box-shadow:0 8px 25px #dc143c4d}.letter-card.locked{background:linear-gradient(135deg,#e0e0e0,#bdbdbd);opacity:.7}.letter-card.locked:hover{transform:scale(1.01)}.letter-card.opened{background:linear-gradient(135deg,#c9a0dc,#b19cd9)}.letter-number{font-size:.9rem;font-weight:600;color:#666;margin-bottom:10px}.letter-icon{font-size:3rem;margin:10px 0;animation:float 3s ease-in-out infinite}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-10px)}}.letter-card.unlocked .letter-icon{animation:pulse 2s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1)}50%{transform:scale(1.1)}}.letter-date{font-size:1rem;font-weight:500;color:#333;margin:10px 0}.letter-countdown{font-size:.85rem;color:#666;margin-top:5px}.letter-status{font-size:.9rem;font-weight:600;margin-top:10px;padding:5px 10px;border-radius:20px}.letter-status.available{background:#dc143c1a;color:#dc143c}.letter-status.read{background:#c9a0dc33;color:#8b4789}@media(max-width:480px){.letter-card{min-height:160px;padding:15px}.letter-icon{font-size:2.5rem}.letter-date{font-size:.9rem}}.letter-list-container{min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.letter-header{text-align:center;padding:30px 20px;margin-bottom:20px}.header-title{color:#fff;font-size:2rem;margin:0 0 10px;text-shadow:2px 2px 4px rgba(0,0,0,.2);animation:fadeInDown .6s ease-out}.header-subtitle{color:#ffffffe6;font-size:1.1rem;margin:0;font-style:italic;animation:fadeInUp .6s ease-out}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.letter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:20px;max-width:1200px;margin:0 auto;padding-bottom:40px}@media(max-width:768px){.letter-list-container{padding:15px}.header-title{font-size:1.6rem}.header-subtitle{font-size:1rem}.letter-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:15px}}@media(max-width:480px){.letter-grid{grid-template-columns:repeat(2,1fr);gap:12px}}.letter-popup-overlay{position:fixed;inset:0;background:#000c;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px;animation:fadeIn .3s ease-out}.letter-popup-overlay.closing{animation:fadeOut .3s ease-out}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes fadeOut{0%{opacity:1}to{opacity:0}}.letter-popup{background:linear-gradient(135deg,#fff5f7,#ffe4e8);border-radius:20px;max-width:600px;width:100%;max-height:85vh;position:relative;box-shadow:0 20px 60px #0006;overflow:hidden;animation:slideUp .5s ease-out;transform-origin:center}.letter-popup.closing{animation:slideDown .4s ease-out}@keyframes slideUp{0%{opacity:0;transform:translateY(100px) scale(.9)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes slideDown{0%{opacity:1;transform:translateY(0) scale(1)}to{opacity:0;transform:translateY(100px) scale(.9)}}.close-button{position:absolute;top:15px;right:15px;width:40px;height:40px;border-radius:50%;background:#dc143c1a;border:2px solid #DC143C;color:#dc143c;font-size:1.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:10;transition:all .3s ease}.close-button:hover{background:#dc143c;color:#fff;transform:rotate(90deg)}.letter-envelope{position:relative;height:80px;background:linear-gradient(135deg,#ff69b4,#dc143c);animation:envelopeOpen .8s ease-out .2s forwards;transform-origin:top}@keyframes envelopeOpen{0%{transform:rotateX(0)}to{transform:rotateX(-180deg)}}.envelope-flap{position:absolute;top:0;left:0;right:0;height:100%;background:linear-gradient(135deg,#dc143c,#ff69b4);clip-path:polygon(0 0,50% 60%,100% 0)}.letter-content-wrapper{padding:30px;overflow-y:auto;max-height:calc(85vh - 80px)}.loading{text-align:center;padding:40px 20px}.loading-heart{font-size:3rem;animation:pulse 1s ease-in-out infinite}.loading p{color:#666;margin-top:10px;font-style:italic}.letter-content{color:#333;line-height:1.8;animation:contentFadeIn .6s ease-out .8s backwards}@keyframes contentFadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.letter-content h1{color:#dc143c;font-size:1.8rem;margin-bottom:20px;text-align:center}.letter-content h2{color:#ff69b4;font-size:1.4rem;margin-top:25px;margin-bottom:15px}.letter-content p{margin-bottom:15px;font-size:1.05rem}.letter-content strong{color:#dc143c;font-weight:600}.letter-content em{color:#8b4789}@media(max-width:768px){.letter-popup{max-height:90vh;border-radius:15px}.letter-content-wrapper{padding:20px;max-height:calc(90vh - 80px)}.letter-content h1{font-size:1.5rem}.letter-content p{font-size:1rem}}@media(max-width:480px){.letter-popup-overlay{padding:10px}.letter-content-wrapper{padding:15px}}.app{min-height:100vh}