:root{font-family:system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}h1{font-size:3.2em;line-height:1.1}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:#1a1a1a;cursor:pointer;transition:border-color .25s}button:hover{border-color:#646cff}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}@media (prefers-color-scheme: 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rgba(0,0,0,.5)}.congrats-subtitle{font-size:1.5rem;margin-bottom:1rem}.congrats-message{font-size:1.2rem;margin-bottom:2rem}.congrats-button{background:#f43f5e;color:#fff;font-weight:600;padding:.75rem 2rem;border-radius:1.5rem;font-size:1rem;cursor:pointer;box-shadow:0 10px 25px #f43f5e4d;transition:all .3s ease}.congrats-button:hover{background-color:#e11d48;transform:scale(1.05)}.congrats-buttons{display:flex;justify-content:center;gap:1rem;margin-top:1.5rem}.back-buttons{position:absolute;top:20px;left:20px;background:#6b7280;color:#fff;font-weight:600;padding:.5rem 1.5rem;border-radius:1rem;font-size:1rem;cursor:pointer;z-index:9999;transition:all .3s ease}.back-buttons:hover{background-color:#4b5563;transform:scale(1.05)}@media (max-width: 768px){.congrats-content{padding:1.5rem 2rem}.congrats-name{font-size:2rem}.congrats-subtitle{font-size:1.2rem}.congrats-message{font-size:1rem}.letter{font-size:1.5rem}}@media (max-width: 480px){.congrats-content{padding:1rem 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.8rem}}.birthday-container{position:relative;width:100vw;height:100vh;background:linear-gradient(135deg,#ffe0f0,#fff5d7,#dbeaff);overflow:hidden;display:flex;align-items:center;justify-content:center;font-family:Poppins,sans-serif}.side-image{position:absolute;top:50%;transform:translateY(-50%);width:250px;max-width:20vw;height:auto;z-index:5}.side-image.left{left:10px}.side-image.right{right:10px}.card-wrapper{perspective:1000px;cursor:pointer;z-index:3}.card-inner{width:350px;max-width:90vw;height:450px;transform-style:preserve-3d;position:relative}.card-front{position:absolute;inset:0;background:linear-gradient(135deg,#ffb6c1,#ff69b4);border-radius:20px;box-shadow:0 8px 20px #0003;display:flex;align-items:center;justify-content:center;font-size:1.6rem;font-weight:700;backface-visibility:hidden;color:#fff}.card-back{position:absolute;inset:0;background:linear-gradient(135deg,#fff,#ffe4e1);border-radius:20px;box-shadow:0 8px 20px #0003;backface-visibility:hidden;transform:rotateY(180deg);display:flex;flex-direction:column;align-items:center;justify-content:center;padding:15px;overflow:hidden}.glow-aura{position:absolute;width:250px;max-width:70%;height:250px;background:radial-gradient(circle,rgba(255,182,193,.5),transparent);border-radius:50%;top:50%;left:50%;transform:translate(-50%,-50%);z-index:1}.birthday-title{font-size:1.8rem;font-weight:800;text-align:center;z-index:2;margin-bottom:10px;background:linear-gradient(90deg,#ff69b4,gold);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.message{font-size:.95rem;text-align:center;max-width:90%;margin-top:10px;z-index:2;line-height:1.4;font-family:cursive}.pink-text{color:#ff69b4}.yellow-text{color:gold}.purple-text{color:#9370db}.green-text{color:#32cd32}.birthday-buttons{position:absolute;top:10px;left:0;right:0;display:flex;justify-content:space-between;padding:0 20px;z-index:10}.back-button{padding:6px 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