:root {
    --card-bg: #ffffff;
    --card-text: #1c2b3a;
    --input-bg: #f4f7fb;
    --input-border: #d9e2ec;
    --overlay: rgba(0, 0, 0, 0);
}

[data-theme="dark"] {
    --card-bg: #1c2531;
    --card-text: #eef2f7;
    --input-bg: #2a3444;
    --input-border: #3b4657;
    --overlay: rgba(8, 12, 18, 0.6);
}

body.auth-body {
    margin: 0;
    min-height: 100vh;
    background: linear-gradient(var(--overlay), var(--overlay)), url('/img/background.webp') no-repeat center center fixed;
    background-size: cover;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
}

.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 60px;
    width: 100%;
    max-width: 1100px;
    padding: 20px;
}

.brand-logo img {
    max-width: 420px;
    width: 100%;
    height: auto;
}

.login-card {
    background: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 15px 40px rgba(20, 60, 120, 0.15);
    padding: 40px 35px;
    width: 100%;
    max-width: 360px;
    border-top: 6px solid;
    border-image: linear-gradient(90deg, #2196F3, #2ecc9a) 1;
    transition: background-color 0.3s ease;
}

    .login-card h4 {
        font-weight: 600;
        color: var(--card-text);
        text-align: center;
        margin-bottom: 25px;
    }

    .login-card .form-control {
        border-radius: 30px;
        padding: 10px 18px;
        border: 1px solid var(--input-border);
        background-color: var(--input-bg);
        color: var(--card-text);
    }

    .login-card .btn-login {
        border-radius: 30px;
        padding: 10px;
        border: none;
        width: 100%;
        color: #fff;
        font-weight: 600;
        background: linear-gradient(90deg, #2196F3, #2ecc9a);
    }

.theme-toggle-btn {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--input-border);
    background: var(--card-bg);
    color: var(--card-text);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 14px rgba(0,0,0,0.15);
    cursor: pointer;
    transition: background-color 0.3s ease;
}

    .theme-toggle-btn svg {
        width: 20px;
        height: 20px;
    }

@media (max-width: 768px) {
    .login-wrapper {
        flex-direction: column;
    }

    .brand-logo img {
        max-width: 260px;
    }
}