:root {
    --sidebar-width: 260px;
    --bg-primary: #0f1117;
    --bg-secondary: #161b22;
    --bg-card: #1c2128;
    --border-color: #30363d;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --text-primary: #e6edf3;
    --text-muted: #8b949e;
    --success: #3fb950;
    --danger: #f85149;
    --warning: #d29922;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
}

* { box-sizing: border-box; }

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    margin: 0;
    min-height: 100vh;
}

/* ── Layout ── */
.admin-wrapper {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 1040;
    transition: transform 0.3s ease;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 24px 20px;
    border-bottom: 1px solid var(--border-color);
}

.brand-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: #fff;
}

.brand-title {
    display: block;
    font-weight: 700;
    font-size: 1.1rem;
}

.brand-sub {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.sidebar-nav .nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    border-radius: 8px;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.sidebar-nav .nav-link i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.sidebar-nav .nav-link:hover {
    background: rgba(99, 102, 241, 0.1);
    color: var(--text-primary);
}

.sidebar-nav .nav-link.active {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(168, 85, 247, 0.15));
    color: var(--accent-hover);
    border: 1px solid rgba(99, 102, 241, 0.3);
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border-color);
}

.user-mini {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: var(--bg-card);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent);
}

.user-name {
    font-weight: 600;
    font-size: 0.85rem;
}

.user-email {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    min-height: 100vh;
}

.topbar {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 28px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.page-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0;
    flex: 1;
}

.content-area {
    padding: 28px;
}

/* ── Cards & Stats ── */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.stat-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.stat-icon.purple { background: rgba(99, 102, 241, 0.15); color: var(--accent); }
.stat-icon.green  { background: rgba(63, 185, 80, 0.15); color: var(--success); }
.stat-icon.red    { background: rgba(248, 81, 73, 0.15); color: var(--danger); }
.stat-icon.orange { background: rgba(210, 153, 34, 0.15); color: var(--warning); }

.stat-value {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    color: var(--text-muted);
    font-size: 0.85rem;
    font-weight: 500;
}

.card-panel {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
}

.card-panel .card-header {
    background: transparent;
    border-bottom: 1px solid var(--border-color);
    padding: 16px 20px;
    font-weight: 600;
}

.card-panel .card-body {
    padding: 20px;
}

/* ── Table ── */
.table-dark-custom {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-primary);
    --bs-table-border-color: var(--border-color);
    margin-bottom: 0;
}

.table-dark-custom thead th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom-width: 1px;
    padding: 12px 16px;
}

.table-dark-custom tbody td {
    padding: 14px 16px;
    vertical-align: middle;
}

.table-dark-custom tbody tr:hover {
    background: rgba(99, 102, 241, 0.05);
}

/* ── Buttons ── */
.btn-accent {
    background: linear-gradient(135deg, var(--accent), #7c3aed);
    border: none;
    color: #fff;
    font-weight: 600;
}

.btn-accent:hover {
    background: linear-gradient(135deg, var(--accent-hover), #8b5cf6);
    color: #fff;
}

/* ── Auth pages ── */
.auth-body {
    background: var(--bg-primary);
    background-image:
        radial-gradient(ellipse at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.1) 0%, transparent 50%);
}

.auth-wrapper {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 36px 32px;
    box-shadow: var(--shadow);
}

.auth-logo {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    color: #fff;
}

.auth-title {
    font-weight: 700;
    font-size: 1.5rem;
}

.form-control, .form-select {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    padding: 10px 14px;
}

.form-control:focus, .form-select:focus {
    background: var(--bg-secondary);
    border-color: var(--accent);
    color: var(--text-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.form-label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.input-group-text {
    background: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-muted);
}

/* ── Server card ── */
.server-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 20px;
    transition: all 0.2s;
}

.server-card:hover {
    border-color: rgba(99, 102, 241, 0.4);
}

.server-card .server-url {
    font-size: 0.8rem;
    color: var(--text-muted);
    word-break: break-all;
}

/* ── Responsive ── */
@media (max-width: 991.98px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .sidebar.show {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
    }
}

/* ── Badges ── */
.bg-success-subtle { background: rgba(63, 185, 80, 0.15) !important; }
.bg-danger-subtle  { background: rgba(248, 81, 73, 0.15) !important; }
.bg-warning-subtle { background: rgba(210, 153, 34, 0.15) !important; }
.bg-info-subtle    { background: rgba(99, 102, 241, 0.15) !important; }
.bg-secondary-subtle { background: rgba(139, 148, 158, 0.15) !important; }

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 16px;
    opacity: 0.4;
}

/* ── Ping badges ── */
.ping-badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 10px;
    border-radius: 20px;
    white-space: nowrap;
}

.ping-excellent {
    background: rgba(63, 185, 80, 0.15);
    color: var(--success);
}

.ping-good {
    background: rgba(99, 102, 241, 0.15);
    color: var(--accent-hover);
}

.ping-slow {
    background: rgba(210, 153, 34, 0.15);
    color: var(--warning);
}

.ping-bad {
    background: rgba(248, 81, 73, 0.15);
    color: var(--danger);
}

.ping-timeout {
    background: rgba(139, 148, 158, 0.15);
    color: var(--text-muted);
}