:root{--primary-color:#0063dc;--secondary-color:#b9dfff;--accent-color:#b9dfff}body{background-color:#f8f9fa;align-items:center;height:100vh;font-family:Segoe UI,Roboto,Helvetica Neue,sans-serif;display:flex}.error-container{text-align:center;background:#fff;border-radius:15px;max-width:800px;margin:0 auto;padding:2rem;box-shadow:0 10px 30px #0000001a}.error-code{color:var(--primary-color);margin-bottom:1rem;font-size:8rem;font-weight:700;line-height:1}.error-title{color:#333;margin-bottom:1.5rem;font-size:2rem;font-weight:600}.error-message{color:#666;margin-bottom:2rem;font-size:1.2rem;line-height:1.6}.btn-primary{background-color:var(--primary-color);border-color:var(--primary-color);border-radius:50px;padding:.6rem 1.5rem;font-weight:500}.btn-primary:hover{background-color:var(--secondary-color);border-color:var(--secondary-color)}.btn-outline-primary{color:var(--primary-color);border-color:var(--primary-color);border-radius:50px;padding:.6rem 1.5rem;font-weight:500}.btn-outline-primary:hover{background-color:var(--primary-color);color:#fff}.audio-icon{color:var(--accent-color);margin-bottom:1.5rem;font-size:5rem;animation:2s infinite pulse}@keyframes pulse{0%{transform:scale(1)}50%{transform:scale(1.1)}to{transform:scale(1)}}