:root {
    --primary: #2563eb;
    --secondary: #7c3aed;
    --success: #10b981;
    --warning: #f97316;
    --danger: #ef4444;
    --light: #f9fafb;
    --border: #e5e7eb;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto;
    color: #1f2937;
    background: var(--light);
}

.navbar {
    background: white;
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--primary);
}

.btn-primary, .btn-large, .btn-pro {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 500;
    background: var(--primary);
    color: white;
    transition: all 0.3s;
}

.btn-primary:hover, .btn-large:hover {
    background: #1d4ed8;
}

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

.btn-pro:hover {
    background: #6d28d9;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 80px 20px;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero .subtitle {
    font-size: 0.9rem;
    opacity: 0.8;
    margin-top: 1rem;
}

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

.features {
    padding: 60px 20px;
    background: white;
}

.features h2 {
    text-align: center;
    margin-bottom: 40px;
    font-size: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.card {
    padding: 20px;
    background: var(--light);
    border-radius: 8px;
    border: 1px solid var(--border);
}

.card h3 {
    color: var(--primary);
    margin-bottom: 10px;
}

footer {
    background: #1f2937;
    color: white;
    text-align: center;
    padding: 20px;
    margin-top: 40px;
}

/* App page */
.app-page {
    padding: 20px;
}

header {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

header h1 {
    margin: 0;
    color: var(--primary);
}

header span {
    color: #999;
}

.checker-panel {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.checker-panel h2 {
    margin-bottom: 1rem;
}

.checker-panel input,
.checker-panel select,
.checker-panel button {
    display: block;
    width: 100%;
    margin-bottom: 1rem;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
}

.checker-panel button {
    background: var(--primary);
    color: white;
    border: none;
    cursor: pointer;
    font-weight: 500;
}

.results-panel,
.history-panel {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    margin-bottom: 2rem;
}

.summary {
    margin-bottom: 2rem;
}

.progress {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.progress-bar {
    height: 8px;
    background: var(--success);
    border-radius: 4px;
    margin-bottom: 1rem;
}

.servers {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.server {
    padding: 1rem;
    background: var(--light);
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--warning);
}

.server.ok {
    border-left-color: var(--success);
}

.server.pending {
    border-left-color: var(--warning);
}

.value {
    font-family: monospace;
    font-size: 0.9rem;
    color: #666;
}

.delay {
    font-size: 0.85rem;
    color: #999;
}

.history-item {
    padding: 0.75rem;
    background: var(--light);
    border-radius: 6px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.time {
    color: #999;
    font-size: 0.85rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: #999;
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 1.8rem;
    }

    header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
}