:root {
    --primary-color: #4361ee;
    --secondary-color: #3f37c9;
    --accent-color: #4895ef;
    --text-color: #333;
    --light-color: #f8f9fa;
    --border-radius: 10px;
    --box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
}

body {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 2.5rem;
    width: 100%;
    max-width: 420px;
    transition: all 0.3s ease;
}

    .login-container:hover {
        transform: translateY(-5px);
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
    }

.login-header {
    text-align: center;
    margin-bottom: 2rem;
}

.brand-logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

    .brand-logo i {
        background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
        font-size: 2rem;
    }

h4 {
    color: #333;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.input-group {
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.input-group-text {
    background-color: white;
    border-right: none;
    color: #6c757d;
}

.form-control {
    border-left: none;
    padding: 0.75rem 1rem;
    font-size: 1rem;
}

    .form-control:focus {
        box-shadow: none;
        border-color: #ced4da;
    }

.error-text {
    color: #dc3545;
    font-size: 0.8rem;
    display: block;
    margin-top: 0.25rem;
    margin-left: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border: none;
    padding: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
}

    .btn-primary:hover {
        background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
        transform: translateY(-2px);
        box-shadow: 0 5px 15px rgba(67, 97, 238, 0.3);
    }

.btn-outline-secondary {
    border-color: #ced4da;
}

a {
    color: var(--accent-color);
    transition: all 0.3s ease;
}

    a:hover {
        color: var(--primary-color);
        text-decoration: underline;
    }

.modal-content {
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

.modal-header {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    border-top-left-radius: var(--border-radius);
    border-top-right-radius: var(--border-radius);
}

.modal-title {
    color: white;
    font-weight: 600;
}

.btn-close {
    filter: brightness(0) invert(1);
}

@media (max-width: 576px) {
    .login-container {
        padding: 1.5rem;
    }
}