:root {
    --primary: #43A047;
    --secondary: #43A047;
    --warning: #cddc39;
    --danger: #c62828;
    --light: #ffffff;
    --dark: #212121;
    --gray: #9e9e9e;
    --border: #e0e0e0;
    --background: #f5f5f5;
}

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

body {
    font-family: 'Inter', 'Roboto', 'Segoe UI', sans-serif;
    background-color: var(--background);
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

h1 {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    color: var(--gray);
    font-size: 18px;
}

.control-panel {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.btn {
    background-color: var(--primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn:hover {
    background-color: #388e3c;
    transform: translateY(-1px);
}

.btn:disabled {
    background-color: #b3c3f3;
    cursor: not-allowed;
}

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

.btn-secondary:hover {
    background-color: #78909c;
}

.btn-warning {
    background-color: var(--warning);
    color: var(--dark);
}

.btn-warning:hover {
    background-color: #d4e157;
}

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

.btn-danger:hover {
    background-color: #d32f2f;
}

.network-info {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 30px;
}

.info-card {
    background-color: white;
    border-radius: 8px;
    padding: 15px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    flex: 1;
    min-width: 200px;
}

.info-card h3 {
    color: var(--gray);
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 10px;
}

.info-card p {
    font-size: 18px;
    font-weight: 500;
}

.info-card .ip {
    color: var(--primary);
}

.results-container {
    background-color: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.08);
    overflow: hidden;
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background-color: var(--primary);
    color: white;
}

.results-header h2 {
    font-weight: 500;
    font-size: 18px;
}

.sort-options {
    display: flex;
    gap: 10px;
}

.sort-btn {
    background: none;
    border: none;
    color: white;
    cursor: pointer;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 5px;
}

.sort-btn.active {
    font-weight: bold;
    text-decoration: underline;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    padding: 15px 20px;
    background-color: #fafafa;
    font-weight: 500;
    color: var(--gray);
}

td {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border);
}

tr:hover {
    background-color: rgba(66, 133, 244, 0.05);
}

.provider {
    display: flex;
    align-items: center;
    gap: 10px;
}

.latency {
    font-family: monospace;
    font-weight: bold;
}

.fast {
    color: var(--secondary);
}

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

.slow {
    color: var(--danger);
}

.action-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--primary);
    font-size: 14px;
}

.progress-container {
    padding: 20px;
    text-align: center;
}

.progress-text {
    margin-bottom: 10px;
    color: var(--gray);
}

.progress-bar {
    height: 6px;
    background-color: #e0e0e0;
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary);
    width: 0%;
    transition: width 0.3s;
}

.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255,255,255,0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.2s;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: white;
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.modal-header {
    padding: 16px 24px;
    background-color: #f5f5f5;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--dark);
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray);
    transition: color 0.2s;
}

.close-btn:hover {
    color: var(--dark);
}

.modal-body {
    padding: 24px;
}

.add-item-form {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
}

.add-item-form input {
    flex: 1;
    padding: 10px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
}

.add-item-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.add-item-form .btn {
    padding: 10px 16px;
}

.config-list {
    list-style: none;
}

.config-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background-color: #fafafa;
    border-radius: 6px;
    margin-bottom: 8px;
    font-size: 14px;
    color: var(--dark);
}

.remove-item {
    background: none;
    border: none;
    color: var(--danger);
    cursor: pointer;
    font-size: 18px;
    transition: color 0.2s;
}

.remove-item:hover {
    color: #d32f2f;
}

.detail-item {
    margin-bottom: 15px;
}

.detail-label {
    font-weight: 500;
    color: var(--gray);
    margin-bottom: 5px;
}

.detail-value {
    font-family: monospace;
}

.website-results {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.website-results th, 
.website-results td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.website-results th {
    background-color: #fafafa;
}

.chart-container {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border: 1px solid #e5e7eb; /* subtle border for better definition */
    transition: box-shadow 0.3s ease;
    overflow-x: auto; /* supports wide charts on mobile */
}

.chart-container:hover {
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
}


@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
    
    .control-panel {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    th, td {
        padding: 10px 12px;
        font-size: 14px;
    }
    
    .chart-container {
        display: none;
    }
}

.disclaimer {
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary);
    padding: 15px;
    margin: 20px 0;
    font-size: 14px;
    color: #5f6368;
}

.disclaimer h3 {
    margin-top: 0;
    color: var(--primary);
}

.methodology {
    background-color: #f1f3f4;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    font-size: 14px;
}

.methodology h3 {
    margin-top: 0;
}

.copy-icon {
    cursor: pointer;
    margin-left: 5px;
}

.copy-icon.copied {
    color: var(--secondary);
}