*{box-sizing:border-box}body{margin:0;font-family:Arial,sans-serif;min-height:100vh;background:linear-gradient(135deg,#ffd1e8,#fff1f7);display:flex;align-items:center;justify-content:center}.container{width:min(92vw,520px);padding:16px}.card{background:rgba(255,255,255,.95);border-radius:24px;padding:24px;box-shadow:0 15px 50px rgba(0,0,0,.12);text-align:center}.logo{width:min(240px,70vw);height:auto;display:block;margin:0 auto 12px}.card h1{margin:0 0 8px;color:#b31b66;font-size:clamp(1.6rem,4vw,2.2rem)}.card p{margin:0 0 18px;color:#6b4b5f}form{display:grid;gap:12px}input,button{border:0;border-radius:14px;padding:14px 16px;font-size:1rem}input{border:2px solid #f1b7d0;text-align:center}button{background:#d81b60;color:#fff;font-weight:700;cursor:pointer}#downloadBtn{background:#00a3b4;margin-top:12px;width:100%}.hidden{display:none}#errorMessage{margin-top:12px;color:#b00020;font-weight:700}#cartonResult{margin-top:18px}#cartonImage{width:100%;border-radius:16px;display:block;border:4px solid #fff;box-shadow:0 8px 24px rgba(0,0,0,.12)}