:root {
    --bs-blue: #0d6efd;
    --bs-gray: #6c757d;
    --bs-gray-dark: #343a40;
    --bs-gray-100: #f8f9fa;
    --bs-gray-200: #e9ecef;
    --bs-gray-300: #dee2e6;
    --bs-border-radius: 0.375rem;
    --bs-primary: var(--bs-blue);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bs-gray-100);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    color: var(--bs-gray-dark);
}

.login-container {
    background-color: #fff;
    border: 1px solid var(--bs-gray-300);
    border-radius: var(--bs-border-radius);
    box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    max-width: 400px;
    width: 100%;
    padding: 2rem;
}

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

.login-header h3 {
    font-size: 1.75rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.login-header p {
    color: var(--bs-gray);
    font-size: 0.875rem;
}

.alert {
    background-color: #f8d7da;
    border: 1px solid #f5c2c7;
    color: #842029;
    padding: 0.75rem 1rem;
    border-radius: var(--bs-border-radius);
    margin-bottom: 1.5rem;
    font-size: 0.875rem;
    position: relative;
    text-align: left;
}

.alert-close {
    position: absolute;
    right: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: inherit;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    opacity: 0.5;
}

.alert-close:hover {
    opacity: 1;
}

.form-group {
    margin-bottom: 1rem;
}

.form-label {
    display: inline-block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: #212529;
    background-color: #fff;
    background-clip: padding-box;
    border: 1px solid var(--bs-gray-300);
    appearance: none;
    border-radius: var(--bs-border-radius);
    transition: border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    outline: none;
}

.form-control:focus {
    color: #212529;
    background-color: #fff;
    border-color: #86b7fe;
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.btn-login {
    display: inline-block;
    width: 100%;
    font-weight: 400;
    line-height: 1.5;
    color: #fff;
    text-align: center;
    text-decoration: none;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    background-color: var(--bs-primary);
    border: 1px solid var(--bs-primary);
    padding: 0.375rem 0.75rem;
    font-size: 1rem;
    border-radius: var(--bs-border-radius);
    transition: color 0.15s ease-in-out, background-color 0.15s ease-in-out, border-color 0.15s ease-in-out, box-shadow 0.15s ease-in-out;
    margin-top: 0.5rem;
}

.btn-login:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.btn-login:active {
    background-color: #0a58ca;
    border-color: #0a53be;
}

.footer-info {
    text-align: center;
    margin-top: 2rem;
    color: var(--bs-gray);
    font-size: 0.75rem;
}