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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: #1a1a1a;
    background: #f5f5f7;
    min-height: 100vh;
}

header {
    background: #1a1a2e;
    color: #e0e0e0;
    padding: 1.25rem 1.5rem;
}

header h1 {
    font-size: 1.15rem;
    font-weight: 600;
    color: #fff;
}

header p {
    font-size: 0.85rem;
    opacity: 0.7;
    margin-top: 0.15rem;
}

.activity-idle {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #4caf50;
    margin-left: 0.75rem;
    transition: background 0.2s;
    vertical-align: middle;
}
.activity-busy {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-left: 0.75rem;
    background: #ff6b6b;
    animation: pulse 0.8s ease-in-out infinite alternate;
    vertical-align: middle;
}
@keyframes pulse {
    from { opacity: 0.4; transform: scale(0.85); }
    to   { opacity: 1;   transform: scale(1.15); }
}

#connect-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 3rem 1.5rem;
    gap: 0.75rem;
}

#connect-status {
    font-size: 0.85rem;
    color: #666;
    min-height: 1.25rem;
}

.tablist {
    display: flex;
    gap: 0;
    background: #1a1a2e;
    padding: 0 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.08);
    overflow-x: auto;
}

.tablist button {
    background: none;
    border: none;
    padding: 0.6rem 1.2rem;
    font: inherit;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.55);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: color 0.15s, border-color 0.15s;
    white-space: nowrap;
}

.tablist button:hover { color: rgba(255,255,255,0.85); }

.tablist button[aria-selected="true"] {
    color: #fff;
    border-bottom-color: #6c63ff;
}

.tablist button:focus-visible {
    outline: 2px solid #6c63ff;
    outline-offset: -2px;
}

.btn:focus-visible {
    outline: 2px solid #6c63ff;
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: #6c63ff;
    color: #fff;
    padding: 0.5rem 1rem;
    z-index: 100;
    font-size: 0.85rem;
    border-radius: 0 0 4px 0;
    text-decoration: none;
}
.skip-link:focus {
    top: 0;
}

.tabpanel {
    display: none;
    padding: 1.5rem;
    max-width: 780px;
}

.tabpanel[aria-hidden="false"] { display: block; }

.tabpanel h2 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #1a1a2e;
}

.tabpanel p.desc {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 1.25rem;
}

.controls {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 1rem;
}

.controls label {
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.35rem;
}

.controls input[type="number"],
.controls select {
    font: inherit;
    font-size: 0.85rem;
    padding: 0.25rem 0.4rem;
    border: 1px solid #ccc;
    border-radius: 4px;
    width: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.5rem 1.25rem;
    font: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.12s, opacity 0.12s;
}

.btn-primary {
    background: #6c63ff;
    color: #fff;
}
.btn-primary:hover { background: #5a52e0; }
.btn-primary:disabled { opacity: 0.4; cursor: default; }

.btn-secondary {
    background: #e0e0e0;
    color: #333;
}
.btn-secondary:hover { background: #d0d0d0; }

.result-box {
    background: #fff;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1rem;
}

.result-box .latency {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1a1a2e;
}

.result-box .detail {
    font-size: 0.85rem;
    color: #666;
    margin-top: 0.25rem;
}

.result-box .detail .reliable { color: #2e7d32; }
.result-box .detail .unreliable { color: #c62828; }

.result-box.aggregate {
    background: #f0f0ff;
    border-color: #c4bfff;
}

.result-box.aggregate .stat {
    font-size: 0.9rem;
}

.event-log {
    background: #1a1a2e;
    color: #b0e0b0;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.8rem;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    max-height: 320px;
    overflow-y: auto;
    line-height: 1.6;
    margin-bottom: 1rem;
}

.event-log .error { color: #ff6b6b; }
.event-log .result { color: #69db7c; }
.event-log .info { color: #74c0fc; }
.event-log .warn { color: #ffd43b; }

.mode-row {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.mode-col {
    flex: 1;
    min-width: 280px;
}

.mode-col h3 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: #1a1a2e;
}

.placeholder {
    opacity: 0.5;
    font-style: italic;
    font-size: 0.85rem;
    border: 1px dashed #ccc;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
}

latency-test { display: none; }

.config-snippet {
    margin-top: 1.5rem;
    font-size: 0.8rem;
}

.config-snippet summary {
    cursor: pointer;
    color: #6c63ff;
    font-weight: 500;
    font-size: 0.8rem;
}

.config-snippet pre {
    background: #1a1a2e;
    color: #e0e0e0;
    padding: 0.75rem 1rem;
    border-radius: 6px;
    overflow-x: auto;
    margin-top: 0.5rem;
    font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
    font-size: 0.78rem;
    line-height: 1.5;
}

.config-snippet code {
    font: inherit;
}

.callout-warn {
    background: #fff8e6;
    border: 1px solid #ffd43b;
    border-radius: 6px;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    color: #7a5800;
    margin-bottom: 1rem;
}