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

:root {
    --primary-color: #2563eb;
    --danger-color: #dc2626;
    --success-color: #16a34a;
    --warning-color: #ea580c;
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 2rem 1rem;
    color: var(--text-primary);
}

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

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

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

main {
    background: var(--card-bg);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: var(--shadow-lg);
}

.lookup-section {
    margin-bottom: 2rem;
}

.input-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

#ipInput {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    transition: all 0.2s;
}

#ipInput:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

#lookupBtn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s;
}

#lookupBtn:hover:not(:disabled) {
    background: #1d4ed8;
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

#lookupBtn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.progress-bar {
    position: relative;
    height: 2rem;
    background: var(--bg-color);
    border-radius: 0.5rem;
    overflow: hidden;
    margin-top: 1rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #3b82f6);
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 600;
    color: var(--text-primary);
}

.summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.summary-card {
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: 0.75rem;
    text-align: center;
    border-left: 4px solid;
}

.summary-card.listed {
    border-left-color: var(--danger-color);
}

.summary-card.clean {
    border-left-color: var(--success-color);
}

.summary-card.error {
    border-left-color: var(--warning-color);
}

.summary-card.total {
    border-left-color: var(--primary-color);
}

.card-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.card-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.filter-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 0.5rem 1rem;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.tab-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

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

.results-container {
    display: grid;
    gap: 0.75rem;
}

.result-item {
    background: var(--bg-color);
    padding: 1rem;
    border-radius: 0.5rem;
    border-left: 4px solid;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 1rem;
    align-items: center;
    transition: all 0.2s;
}

.result-item:hover {
    box-shadow: var(--shadow);
    transform: translateX(2px);
}

.result-item.listed {
    border-left-color: var(--danger-color);
}

.result-item.clean {
    border-left-color: var(--success-color);
}

.result-item.error {
    border-left-color: var(--warning-color);
}

.result-status {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
}

.result-item.listed .result-status {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger-color);
}

.result-item.clean .result-status {
    background: rgba(22, 163, 74, 0.1);
    color: var(--success-color);
}

.result-item.error .result-status {
    background: rgba(234, 88, 12, 0.1);
    color: var(--warning-color);
}

.result-info {
    flex: 1;
}

.result-name {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.result-host {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-family: 'Courier New', monospace;
}

.result-description {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.result-meta {
    text-align: right;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.result-time {
    font-weight: 600;
    color: var(--text-primary);
}

.error-message {
    background: rgba(220, 38, 38, 0.1);
    color: var(--danger-color);
    padding: 1rem;
    border-radius: 0.5rem;
    border-left: 4px solid var(--danger-color);
    margin-top: 1rem;
}

footer {
    text-align: center;
    margin-top: 2rem;
    color: white;
    opacity: 0.9;
}

.hidden {
    display: none !important;
}

@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .input-group {
        flex-direction: column;
    }

    .summary-cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-item {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .result-meta {
        text-align: center;
    }
}