:root {
        --primary-color: #1a9837;
        --primary-dark: #137a2d;
        --secondary-color: #e0f0e4;
        --border-color: #ddd;
        --warning-color: #ffcc00;
        --error-color: #ff6666;
        --success-color: #66cc66;
        --text-color: #333;
        --text-light: #666;
        --bg-color: #f9f9f9;
        --card-bg: #ffffff;
    }

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

    body {
        font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
        line-height: 1.6;
        color: var(--text-color);
        background-color: var(--bg-color);
        padding: 20px;
    }

    h1, h2, h3, h4 {
        color: var(--primary-color);
        font-weight: 600;
    }

    h1 {
        font-size: 2.2rem;
        text-align: center;
        margin-bottom: 1.5rem;
        position: relative;
        padding-bottom: 1rem;
    }

    h1::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        transform: translateX(-50%);
        width: 80px;
        height: 4px;
        background: var(--primary-color);
        border-radius: 2px;
    }

    .container {
        max-width: 1200px;
        margin: 0 auto;
    }

    .card {
        background-color: var(--card-bg);
        border-radius: 10px;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
        padding: 2rem;
        margin-bottom: 2rem;
        border: 1px solid var(--border-color);
    }

    .grid {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 2rem;
    }

    @media (max-width: 768px) {
        .grid {
            grid-template-columns: 1fr;
        }
    }

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

    label {
        display: block;
        margin-bottom: 0.5rem;
        font-weight: 500;
        color: var(--text-color);
    }

    input, select, textarea {
        width: 100%;
        padding: 0.8rem 1rem;
        border: 1px solid var(--border-color);
        border-radius: 6px;
        font-size: 1rem;
        transition: all 0.3s ease;
        background-color: var(--card-bg);
    }

    input:focus, select:focus, textarea:focus {
        outline: none;
        border-color: var(--primary-color);
        box-shadow: 0 0 0 3px rgba(26, 152, 55, 0.1);
    }

    textarea {
        resize: vertical;
        min-height: 120px;
    }

    .radio-group {
        display: flex;
        gap: 1.5rem;
        margin-top: 0.5rem;
    }

    .radio-group label {
        display: flex;
        align-items: center;
        gap: 0.5rem;
        cursor: pointer;
        font-weight: normal;
    }

    button {
        background-color: var(--primary-color);
        color: white;
        border: none;
        padding: 0.8rem 1.5rem;
        border-radius: 6px;
        cursor: pointer;
        font-size: 1rem;
        font-weight: 500;
        transition: all 0.3s ease;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    button:hover {
        background-color: var(--primary-dark);
        transform: translateY(-1px);
		color: #FFFFFF;
    }

    button:disabled {
        background-color: var(--border-color);
        cursor: not-allowed;
        transform: none;
    }

    .btn-secondary {
        background-color: var(--primary-color);
        color: #FFFFFF;
    }

    .btn-secondary:hover {
        background-color: var(--primary-dark);
		color: #FFFFFF;
    }

    .btn-group {
        display: flex;
        gap: 0.8rem;
        flex-wrap: wrap;
        margin-top: 1rem;
    }

    .results {
        background-color: var(--secondary-color);
        padding: 1.5rem;
        border-radius: 8px;
        margin-top: 1.5rem;
    }

    .result-item {
        display: flex;
        justify-content: space-between;
        padding: 0.8rem 0;
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .result-item:last-child {
        border-bottom: none;
    }

    .result-label {
        font-weight: 500;
        color: var(--text-light);
    }

    .result-value {
        font-family: 'Roboto Mono', monospace;
        font-weight: 500;
        color: var(--text-color);
    }

    .tabs {
        display: flex;
        margin-bottom: 1.5rem;
        border-bottom: 1px solid var(--border-color);
    }

    .tab {
        padding: 0.8rem 1.5rem;
        cursor: pointer;
        font-weight: 500;
        background: transparent;
        border: none;
        border-bottom: 3px solid transparent;
        color: var(--text-light);
        transition: all 0.3s ease;
    }

    .tab.active {
		background-color: var(--secondary-color);
        color: var(--primary-color);
        border-bottom-color: var(--primary-color);
    }

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

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

    @keyframes fadeIn {
        from { opacity: 0; transform: translateY(10px); }
        to { opacity: 1; transform: translateY(0); }
    }

    .ip-visualization {
        background-color: var(--secondary-color);
        padding: 1.5rem;
        border-radius: 8px;
        margin-top: 1.5rem;
        font-family: 'Roboto Mono', monospace;
    }

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

    .success {
        color: var(--success-color);
    }

    .warning {
        color: var(--warning-color);
    }

    .about-content {
        line-height: 1.8;
    }

    .about-content h3 {
        margin: 1.5rem 0 1rem;
        color: var(--primary-color);
    }

    .about-content ul {
        padding-left: 1.5rem;
        margin: 1rem 0;
    }

    .about-content li {
        margin-bottom: 0.5rem;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin: 1.5rem 0;
        font-size: 0.95rem;
    }

    th, td {
        padding: 0.8rem;
        text-align: left;
        border-bottom: 1px solid var(--border-color);
    }

    th {
        background-color: var(--secondary-color);
        color: var(--primary-color);
        font-weight: 500;
    }

    tr:hover {
        background-color: rgba(224, 240, 228, 0.3);
    }

    .example-btn {
        background-color: var(--secondary-color);
        padding: 1rem;
        border-radius: 8px;
        cursor: pointer;
        transition: all 0.3s ease;
        text-align: center;
        color: var(--primary-color);
        font-weight: 500;
    }

    .example-btn:hover {
        background-color: #d0e8d6;
        transform: translateY(-2px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .feature-box {
        background-color: var(--secondary-color);
        padding: 1.5rem;
        border-radius: 8px;
        margin-bottom: 1.5rem;
        border-left: 4px solid var(--primary-color);
    }

    .feature-box h4 {
        margin-bottom: 0.8rem;
        color: var(--primary-color);
    }

    .hidden {
        display: none;
    }

    .badge {
        display: inline-block;
        padding: 0.25rem 0.5rem;
        border-radius: 50px;
        font-size: 0.75rem;
        font-weight: 600;
        background-color: var(--primary-color);
        color: white;
    }