:root {
    --header-bg-color: #005f77;
    --card-header-bg: #e3eaf2;
    --btn-turquoise: #0097b2;
    --btn-hover: #007a8f;
    --text-color: #4a5568;
}

html, body {
    height: 100%;
    margin: 0;
    background-color: #ffffff;
    font-family: sans-serif;
}

body {
    display: flex;
    flex-direction: column;
}

.app-header {
    background-color: var(--header-bg-color);
    padding: 0.75rem 1.5rem;
    width: 100%;
}

.login-wrapper {
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 450px;
    border-radius: 4px;
    border: 1px solid #dee2e6;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.card-header {
    background-color: var(--card-header-bg);
    color: var(--text-color);
    font-weight: 600;
    padding: 0.75rem 1.25rem;
    border-bottom: none;
}

.card-body {
    padding: 1.5rem;
}

.form-label {
    color: var(--text-color);
    font-weight: 500;
    margin-bottom: 0.3rem;
}

.btn-anmelden {
    background-color: var(--btn-turquoise);
    color: white;
    border: none;
    border-radius: 4px;
    font-weight: bold;
    transition: background-color 0.2s;
}

.btn-anmelden:hover {
    background-color: var(--btn-hover);
    color: white;
}

.form-control:focus {
    border-color: var(--btn-turquoise);
    box-shadow: 0 0 0 0.2rem rgba(0, 151, 178, 0.25);
}

/* Tab-Styling innerhalb der Card */
.nav-tabs.card-header-tabs {
    border-bottom: none;
}

.nav-tabs .nav-link {
    color: var(--text-color);
    border: none;
    font-weight: 500;
}

.nav-tabs .nav-link.active {
    background-color: white;
    color: var(--btn-turquoise);
    border-radius: 4px 4px 0 0;
    border: 1px solid #dee2e6;
    border-bottom-color: white;
}

.nav-tabs .nav-link:hover:not(.active) {
    border-color: transparent;
    color: var(--btn-hover);
}