:root {
    --primary: #0057B8;
    /* ATT Blue */
    --primary-dark: #003876;
    --accent: #FF7200;
    /* ATT Orange (optional CTA) */
    --text-dark: #333333;
    --text-light: #666666;
    --bg-page: #F2F2F2;
    --bg-card: #FFFFFF;
    --border: #d2d2d2;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-page);
    color: var(--text-dark);
    margin: 0;
    padding: 20px;
    line-height: 1.5;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-card);
    padding: 40px;
    border-radius: 4px;
    /* Slight radius for corporate look */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

header {
    text-align: center;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 20px;
}

h1 {
    margin: 0;
    color: var(--primary);
    font-weight: 300;
    letter-spacing: -0.5px;
}

h2 {
    margin-top: 20px;
    border-bottom: 1px solid var(--border);
    padding-bottom: 8px;
    font-size: 1.4rem;
    color: var(--primary-dark);
}

h3 {
    margin-top: 20px;
    font-size: 1.1rem;
    color: var(--text-dark);
}

.tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border);
    gap: 5px;
}

.tab-btn {
    padding: 12px 25px;
    border: none;
    background: #e9e9e9;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-dark);
    border-radius: 4px 4px 0 0;
    transition: background 0.2s, color 0.2s;
}

.tab-btn:hover {
    background: #ddd;
}

.tab-btn.active {
    background: var(--primary);
    color: white;
    font-weight: 600;
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-dark);
}

input[type="text"],
input[type="number"],
select,
input[type="file"] {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 3px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: border-color 0.2s;
}

input[type="text"]:focus,
input[type="number"]:focus,
select:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 87, 184, 0.1);
}

.checkbox-group {
    background: #f9f9f9;
    padding: 15px;
    border: 1px solid var(--border);
    border-radius: 4px;
}

button.btn-primary {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 600;
    width: 100%;
    margin-top: 10px;
    transition: background-color 0.2s;
}

button.btn-primary:hover {
    background-color: var(--primary-dark);
}

.status-msg {
    margin-top: 15px;
    font-weight: bold;
    text-align: center;
}

/* Help Table */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th,
td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    background-color: var(--primary);
    color: white;
    font-weight: 600;
}

tr:nth-child(even) {
    background-color: #f8f8f8;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Mobile Responsiveness */
@media (max-width: 600px) {
    .container {
        padding: 15px;
        width: 100%;
        box-shadow: none;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .tabs {
        flex-wrap: wrap;
    }

    .tab-btn {
        flex: 1 1 auto;
        text-align: center;
        padding: 10px;
        font-size: 0.9rem;
    }

    header h1 {
        font-size: 1.5rem;
    }
}