* {
    box-sizing: border-box;
}

body {
    margin: 0;
    height: 100vh;
    background: linear-gradient(135deg, #0a0c10, #0d1b2a, #0a2342);
    font-family: 'Poppins', sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.error-container {
    text-align: center;
    background: rgba(15, 19, 26, 0.9);
    padding: 50px 60px;
    border-radius: 12px;
    box-shadow: 0 0 30px rgba(13, 110, 253, 0.25);
    border: 1px solid rgba(13, 110, 253, 0.3);
}

.error-container h1 {
    font-size: 96px;
    margin: 0;
    color: #0d6efd;
}

.error-container h2 {
    margin: 10px 0;
    font-weight: 500;
}

.error-container p {
    color: #a1adc4;
    margin-bottom: 30px;
}

.btn {
    display: inline-block;
    padding: 12px 25px;
    background: linear-gradient(to right, #0d6efd, #4ea1ff);
    color: #fff;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 500;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(13, 110, 253, 0.6);
}