:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --light-color: #ecf0f1;
}

body {
    background: linear-gradient(135deg, #2c3e50 0%, #4a6491 100%);
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.login-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 400px;
    overflow: hidden;
}

.login-header {
    background-color: var(--primary-color);
    color: white;
    text-align: center;
    padding: 20px;
}

.login-header h1 {
    font-size: 1.8rem;
    margin: 0;
    font-weight: 700;
}

.login-header p {
    margin: 5px 0 0;
    font-size: 0.9rem;
    opacity: 0.8;
}

.login-body {
    padding: 25px;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.form-control {
    padding: 12px 15px;
    border: 2px solid #ddd;
    border-radius: 6px;
    transition: all 0.3s;
}

.form-control:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 0.25rem rgba(52, 152, 219, 0.25);
}

.input-icon {
    position: relative;
}

.input-icon i {
    position: absolute;
    right: 15px;
    top: 13px;
    color: #7f8c8d;
}

.btn-login {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 12px;
    font-weight: 600;
    width: 100%;
    border-radius: 6px;
    transition: all 0.3s;
    margin-top: 10px;
}

.btn-login:hover {
    background-color: #c0392b;
    transform: translateY(-2px);
}

.btn-login:active {
    transform: translateY(0);
}

.footer {
    text-align: center;
    padding: 20px;
    color: #7f8c8d;
    font-size: 0.8rem;
    border-top: 1px solid #eee;
}

.invalid-feedback {
    display: none;
    color: var(--accent-color);
    font-size: 0.85rem;
    margin-top: 5px;
}

.is-invalid {
    border-color: var(--accent-color) !important;
}

.is-invalid + .invalid-feedback {
    display: block;
}