:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --success: #22c55e;
    --border: #334155;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-family);
    line-height: 1.5;
    padding: 20px;
    -webkit-font-smoothing: antialiased;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
    padding: 40px 0;
    border-bottom: 1px solid var(--border);
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 15px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.ip-display {
    display: inline-block;
    background: var(--card-bg);
    padding: 4px 12px;
    border-radius: 20px;
    font-family: monospace;
    color: var(--accent);
    margin-top: 10px;
    border: 1px solid var(--border);
}

.controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 40px;
    position: sticky;
    top: 20px;
    z-index: 100;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    padding: 15px;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3);
}

#pingbutton {
    background-color: var(--accent);
    color: white;
    border: none;
    padding: 12px 40px;
    font-size: 1rem;
    font-weight: 700;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
    box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.5);
}

#pingbutton:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 12px -2px rgba(59, 130, 246, 0.6);
}

#pingbutton:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    filter: grayscale(0.5);
}

#imageCell {
    width: 0;
    height: 0;
    overflow: hidden;
    position: absolute;
}

/* Tabs Styles */
.tabs-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.tab-btn {
    background-color: var(--card-bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.2s;
    font-family: var(--font-family);
}

.tab-btn:hover {
    background-color: #2d3b4e;
    color: var(--text-primary);
}

.tab-btn.active {
    background-color: var(--accent);
    color: white;
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

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

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

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

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

.regions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 30px;
}

.continent-title {
    display: none;
    /* Hidden in tabs view as the tab button serves as title */
}

.region-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.2s ease;
}

.region-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.region-info {
    display: flex;
    flex-direction: column;
}

.region-name {
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.region-code {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: monospace;
}

.latency {
    font-family: monospace;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-secondary);
    text-align: right;
}

.fastest-latency {
    color: var(--success);
    text-shadow: 0 0 15px rgba(34, 197, 94, 0.4);
}

footer {
    text-align: center;
    margin-top: 60px;
    padding-top: 40px;
    border-top: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.linkedin-badges {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 30px 0;
    flex-wrap: wrap;
}

.aws-status-link {
    display: inline-block;
    margin-top: 20px;
    color: var(--accent);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.aws-status-link:hover {
    color: var(--accent-hover);
    text-decoration: underline;
}

/* Responsive adjustments */
@media (max-width: 600px) {
    h1 {
        font-size: 1.8rem;
    }

    .controls {
        flex-direction: column;
        gap: 10px;
    }

    #pingbutton {
        width: 100%;
    }

    .regions-grid {
        grid-template-columns: 1fr;
    }

    .tabs-nav {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
        text-align: center;
    }
}

@keyframes blink {
    0% {
        opacity: 1;
        box-shadow: 0 0 5px var(--success);
        border-color: var(--success);
    }

    50% {
        opacity: 0.6;
        box-shadow: 0 0 20px var(--success);
        border-color: var(--success);
    }

    100% {
        opacity: 1;
        box-shadow: 0 0 5px var(--success);
        border-color: var(--success);
    }
}

.blink-fastest {
    animation: blink 1s infinite;
    border-color: var(--success) !important;
    color: var(--success) !important;
}

@keyframes blinkButton {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.5;
    }

    100% {
        opacity: 1;
    }
}

.blink-calculating {
    animation: blinkButton 0.8s infinite;
}