/* ── Reset & Base ────────────────────────────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, sans-serif;
    background: #0f1117;
    color: #e1e4e8;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Header ─────────────────────────────────────────────── */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
    background: #161b22;
    border-bottom: 1px solid #30363d;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-left h1 {
    font-size: 20px;
    font-weight: 600;
}

.version {
    font-size: 12px;
    color: #8b949e;
    background: #21262d;
    padding: 2px 8px;
    border-radius: 12px;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #3fb950;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-text {
    color: #7ee787;
}

.uptime {
    font-size: 13px;
    color: #8b949e;
}

/* ── Main ───────────────────────────────────────────────── */
.main {
    flex: 1;
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* ── Cards ──────────────────────────────────────────────── */
.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.card {
    display: flex;
    align-items: center;
    gap: 16px;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 20px;
}

.card-icon {
    font-size: 32px;
    line-height: 1;
}

.card-body {
    display: flex;
    flex-direction: column;
}

.card-value {
    font-size: 28px;
    font-weight: 700;
    line-height: 1.2;
}

.card-label {
    font-size: 13px;
    color: #8b949e;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.card-peers .card-value { color: #58a6ff; }
.card-sessions .card-value { color: #3fb950; }
.card-devices .card-value { color: #d29922; }
.card-errors .card-value { color: #f85149; }

/* ── Tabs ────────────────────────────────────────────────── */
.tabs {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    overflow: hidden;
}

.tab-nav {
    display: flex;
    border-bottom: 1px solid #30363d;
    background: #0d1117;
}

.tab-btn {
    padding: 10px 20px;
    border: none;
    background: none;
    color: #8b949e;
    font-size: 14px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.tab-btn:hover {
    color: #e1e4e8;
    background: #161b22;
}

.tab-btn.active {
    color: #58a6ff;
    border-bottom-color: #58a6ff;
    background: transparent;
}

.tab-content {
    display: none;
    padding: 16px;
}

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

/* ── Data Table ─────────────────────────────────────────── */
.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.data-table th {
    text-align: left;
    padding: 10px 12px;
    color: #8b949e;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid #30363d;
}

.data-table td {
    padding: 10px 12px;
    border-bottom: 1px solid #21262d;
    font-variant-numeric: tabular-nums;
}

.data-table tbody tr:hover {
    background: #1c2128;
}

.data-table .empty {
    text-align: center;
    color: #8b949e;
    padding: 32px;
    font-style: italic;
}

.data-table .status-badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 12px;
}

.status-badge.online {
    background: rgba(63, 185, 80, 0.15);
    color: #7ee787;
}

.status-badge.offline {
    background: rgba(248, 81, 73, 0.15);
    color: #f85149;
}

.btn-disconnect {
    padding: 4px 10px;
    border: 1px solid #f85149;
    background: transparent;
    color: #f85149;
    border-radius: 4px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.btn-disconnect:hover {
    background: rgba(248, 81, 73, 0.15);
}

/* ── Info Grid ──────────────────────────────────────────── */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px;
    background: #0d1117;
    border-radius: 6px;
}

.info-label {
    font-size: 12px;
    color: #8b949e;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 16px;
    font-weight: 500;
}

/* ── Footer ─────────────────────────────────────────────── */
.footer {
    display: flex;
    justify-content: space-between;
    padding: 12px 24px;
    background: #161b22;
    border-top: 1px solid #30363d;
    font-size: 12px;
    color: #8b949e;
}

/* ── Responsive ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .header {
        flex-direction: column;
        gap: 8px;
        align-items: flex-start;
    }

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

    .data-table {
        font-size: 12px;
    }

    .data-table th, .data-table td {
        padding: 6px 8px;
    }
}