:root {
    --primary-color: #007BFF;
    --background-color: #f8f9fa;
    --surface-color: #ffffff;
    --text-color: #343a40;
    --border-color: #dee2e6;
    --error-color: #dc3545;
    --success-color: #28a745;
    --border-radius: 8px;
    --shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    box-sizing: border-box;
}

.container {
    width: 100%;
    max-width: 600px;
}

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

h1 {
    color: var(--primary-color);
}

.card {
    background-color: var(--surface-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="url"],
textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    box-sizing: border-box;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

.btn {
    width: 100%;
    padding: 0.85rem;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: #6c757d;
    margin-top: 1rem;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.hidden {
    display: none;
}

.error-message {
    color: var(--error-color);
    margin-top: 0.5rem;
    font-size: 0.9rem;
    text-align: center;
}

#admin-status {
    margin-top: 1rem;
    text-align: center;
    font-weight: 600;
}