body {
    background-color: #212529;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    color: #dee2e6;
    font-family: Arial, sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
    box-sizing: border-box;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 0;
}

.wrapper {
    background-color: #2b3035;
    border: 1px solid #373d44;
    padding: 44px 48px;
    border-radius: 8px;
    text-align: center;
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 1;
}

.wrapper img {
    margin-bottom: 18px;
}

.wrapper h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: #f8f9fa;
    margin-bottom: 4px;
}

.wrapper > p {
    color: #adb5bd;
    font-size: 0.875rem;
    margin-top: 4px;
    margin-bottom: 24px;
}

.alert-danger {
    background-color: #3b1e20;
    border: 1px solid #6f2229;
    color: #ea868f;
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: 0.875rem;
    text-align: left;
}

.form-group {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: 16px;
    width: 100%;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    color: #adb5bd;
    margin-bottom: 6px;
}

.form-group input[type="text"],
.form-group input[type="password"] {
    width: 100%;
    padding: 8px 12px;
    background-color: #343a40;
    border: 1px solid #495057;
    border-radius: 6px;
    color: #dee2e6;
    font-size: 0.95rem;
    font-family: inherit;
    outline: none;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
    box-sizing: border-box;
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus {
    border-color: #0d6efd;
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.25);
}

.form-group .is-invalid {
    border-color: #dc3545;
}

.form-group .is-invalid:focus {
    box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.25);
}

.form-group .invalid-feedback {
    color: #ea868f;
    font-size: 0.8rem;
    margin-top: 4px;
}

.form-group input[type="submit"],
.form-group .btn-primary {
    width: 100%;
    padding: 9px 12px;
    background-color: #0d6efd;
    color: #fff;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    border: 1px solid #0d6efd;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.15s ease, border-color 0.15s ease;
}

.form-group input[type="submit"]:hover,
.form-group .btn-primary:hover {
    background-color: #0b5ed7;
    border-color: #0a58ca;
}

.form-group input[type="submit"]:active,
.form-group .btn-primary:active {
    background-color: #0a58ca;
    border-color: #0a53be;
}

p {
    margin-top: 16px;
    font-size: 0.85rem;
    color: #adb5bd;
}

a {
    color: #6ea8fe;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}