body { 
        background-color: #0f172a;
        background-image: radial-gradient(circle at top right, #1e293b, #0f172a);
        min-height: 100vh;
    }
    .auth-wrapper {
        min-height: 100vh;
        display: flex;
        align-items: center; /* Card tetap di tengah layar secara vertikal */
        justify-content: center;
        padding: 20px;
    }
    
    .auth-card {
        background: rgba(30, 41, 59, 0.8);
        backdrop-filter: blur(10px);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 20px;
        padding: 25px; /* Padding dikurangi agar tidak terlalu tinggi */
        width: 100%;
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }

    .auth-logo {
        font-size: 1.75rem;
        font-weight: 800;
        letter-spacing: -1px;
        background: linear-gradient(to right, #0ea5e9, #2dd4bf);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        margin-bottom: 0.5rem;
    }

    .input-group-smart {
        position: relative;
        margin-bottom: 15px; /* Jarak antar input dipersempit */
    }

    .input-group-smart i {
        position: absolute;
        left: 15px;
        top: 50%;
        transform: translateY(-50%);
        color: #94a3b8;
        z-index: 10;
    }

    .form-control-smart {
        background: rgba(15, 23, 42, 0.6) !important;
        border: 1px solid rgba(255, 255, 255, 0.1) !important;
        color: #f8fafc !important;
        padding: 12px 15px 12px 45px !important;
        border-radius: 12px !important;
        transition: all 0.3s ease;
    }

    .form-control-smart:focus {
        border-color: #0ea5e9 !important;
        box-shadow: 0 0 0 4px rgba(14, 165, 233, 0.1) !important;
        background: rgba(15, 23, 42, 0.8) !important;
    }

    .btn-auth {
        background: linear-gradient(135deg, #0ea5e9 0%, #2563eb 100%);
        border: none;
        color: white;
        padding: 12px;
        border-radius: 12px;
        font-weight: 600;
        transition: all 0.3s ease;
        margin-top: 10px;
    }

    .btn-auth:hover {
        transform: translateY(-2px);
        box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.4);
        filter: brightness(1.1);
    }

    .auth-switch-text {
        color: #94a3b8;
        font-size: 0.875rem;
        margin-top: 1.5rem;
    }

    .auth-switch-link {
        color: #38bdf8;
        text-decoration: none;
        font-weight: 600;
    }

    .auth-switch-link:hover {
        text-decoration: underline;
    }

    /* Animasi transisi form */
    #loginForm, #registerForm {
        animation: fadeIn 0.4s ease-out;
    }

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }

/* Menyamarkan warna placeholder agar kontras di background gelap */
.form-control-smart::placeholder {
    color: rgba(255, 255, 255, 0.5) !important;
    opacity: 1; /* Firefox */
}

/* Untuk browser lama (Internet Explorer/Edge) */
.form-control-smart:-ms-input-placeholder {
    color: rgba(255, 255, 255, 0.5) !important;
}

.form-control-smart::-ms-input-placeholder {
    color: rgba(255, 255, 255, 0.5) !important;
}

/* Sedikit tambahan agar ikon juga lebih menyala */
.input-group-smart i {
    color: #38bdf8; /* Warna biru cerah agar senada dengan logo */
    font-size: 1.1rem;
}