body {
    margin: 0;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #000;
    font-family: 'Inter', system-ui, sans-serif;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 50% 50%, #0f172a 0%, #000000 70%);
    z-index: -1;
    animation: pulseBG 10s ease-in-out infinite;
}

@keyframes pulseBG {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

.glass-card {
    width: 360px;
    padding: 40px;
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
}

h1 {
    color: #fff;
    font-weight: 300;
    letter-spacing: 2px;
    margin-bottom: 30px;
    font-size: 24px;
}

input {
    width: 100%;
    padding: 14px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    color: #fff;
    font-size: 16px;
    outline: none;
    transition: all 0.3s;
    text-align: center;
    margin-bottom: 20px;
    box-sizing: border-box;
}

input:focus {
    border-color: #3b82f6;
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.3);
}

button {
    width: 100%;
    padding: 14px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-sizing: border-box;
}

button:hover {
    filter: brightness(1.2);
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.5);
}

.err {
    color: #ef4444;
    margin-top: 15px;
    font-size: 14px;
    height: 20px;
}