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

:root {
    --bg-primary: #0b1120;
    --bg-secondary: #111827;
    --bg-card: #1a2332;
    --bg-card-hover: #1f2b3d;
    --border: rgba(255, 255, 255, 0.06);
    --border-active: rgba(99, 102, 241, 0.4);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.15);
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.1);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.1);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.1);
    --blue: #3b82f6;
    --blue-bg: rgba(59, 130, 246, 0.1);
    --sidebar-w: 260px;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --shadow-card: 0 1px 3px rgba(0,0,0,0.3), 0 1px 2px rgba(0,0,0,0.2);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.4);
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ===== Sidebar ===== */
.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-secondary);
    padding: 0;
    flex-shrink: 0;
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    transition: transform var(--transition);
}

.sidebar-header {
    padding: 24px 24px 20px;
    border-bottom: 1px solid var(--border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--accent), #a78bfa);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    font-weight: 800;
    color: white;
    flex-shrink: 0;
}

.logo-text {
    font-size: 17px;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-badge {
    font-size: 10px;
    font-weight: 600;
    color: var(--accent-light);
    background: var(--accent-glow);
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: auto;
    letter-spacing: 0.05em;
}

.nav-section-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: 24px 24px 8px;
}

.nav-menu {
    list-style: none;
    padding: 8px 12px;
    flex: 1;
}

.nav-item {
    margin-bottom: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 14px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-weight: 500;
    font-size: 14px;
    transition: all var(--transition);
    position: relative;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
}

.nav-link.active {
    background: var(--accent-glow);
    color: var(--accent-light);
    font-weight: 600;
}

.nav-link.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}

.nav-link i, .nav-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.7;
}

.nav-link.active i, .nav-link.active svg {
    opacity: 1;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
}

.sidebar-footer-text {
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Mobile sidebar toggle */
.mobile-toggle {
    display: none;
    position: fixed;
    top: 16px;
    left: 16px;
    z-index: 200;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 10px;
    color: var(--text-primary);
    cursor: pointer;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-w);
    padding: 32px 40px;
    overflow-y: auto;
    min-height: 100vh;
}

.page-header {
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.page-header-left {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.page-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.page-subtitle {
    font-size: 14px;
    color: var(--text-muted);
}

/* ===== Cards ===== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: transparent;
    transition: background var(--transition);
}

.card:hover {
    border-color: var(--border-active);
    transform: translateY(-1px);
    box-shadow: var(--shadow-card);
}

.card.card-accent::before { background: linear-gradient(90deg, var(--accent), var(--accent-light)); }
.card.card-success::before { background: linear-gradient(90deg, var(--success), #34d399); }
.card.card-blue::before { background: linear-gradient(90deg, var(--blue), #60a5fa); }
.card.card-warning::before { background: linear-gradient(90deg, var(--warning), #fbbf24); }

.card-icon {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
}

.card-icon.icon-accent { background: var(--accent-glow); color: var(--accent-light); }
.card-icon.icon-success { background: var(--success-bg); color: var(--success); }
.card-icon.icon-blue { background: var(--blue-bg); color: var(--blue); }
.card-icon.icon-warning { background: var(--warning-bg); color: var(--warning); }

.card-title {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 8px;
}

.card-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.card-footer {
    margin-top: 12px;
    font-size: 12px;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ===== Tables ===== */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.table-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
}

.table-title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
}

.data-table th {
    padding: 12px 24px;
    text-align: left;
    font-weight: 600;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border);
}

.data-table td {
    padding: 14px 24px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font-size: 14px;
    color: var(--text-secondary);
}

.data-table tbody tr {
    transition: background var(--transition);
}

.data-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 18px;
    border-radius: var(--radius-xs);
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    border: none;
    transition: all var(--transition);
    font-family: inherit;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #7c3aed);
    color: white;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
    transform: translateY(-1px);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.2);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
    border-radius: 5px;
}

.btn-icon {
    padding: 8px;
    border-radius: var(--radius-xs);
    background: transparent;
    color: var(--text-muted);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-icon:hover {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-primary);
}

/* ===== Badges ===== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 8px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.02em;
    background: rgba(255, 255, 255, 0.06);
    color: var(--text-secondary);
    margin-right: 4px;
    margin-bottom: 2px;
}

.badge-accent { background: var(--accent-glow); color: var(--accent-light); }
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }

/* ===== Status Indicators ===== */
.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
    margin-right: 8px;
}

.status-dot.online { background: var(--success); box-shadow: 0 0 8px rgba(16, 185, 129, 0.5); }
.status-dot.offline { background: var(--danger); box-shadow: 0 0 8px rgba(239, 68, 68, 0.5); }
.status-dot.warning { background: var(--warning); box-shadow: 0 0 8px rgba(245, 158, 11, 0.5); }

.status-active { color: var(--success); }
.status-inactive { color: var(--danger); }

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    width: 440px;
    max-width: 90vw;
    box-shadow: var(--shadow-lg);
    animation: slideUp 0.3s ease;
}

.modal h2 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
    letter-spacing: -0.02em;
}

.modal-subtitle {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 24px;
}

/* ===== Forms ===== */
.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-xs);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 14px;
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.form-control:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* ===== Copy Box ===== */
.copy-box {
    background: var(--bg-primary);
    border: 1px solid var(--accent);
    padding: 14px 16px;
    border-radius: var(--radius-sm);
    margin-top: 16px;
    word-break: break-all;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 13px;
    color: var(--accent-light);
    position: relative;
    cursor: pointer;
    transition: background var(--transition);
}

.copy-box:hover {
    background: rgba(99, 102, 241, 0.05);
}

.copy-box::after {
    content: 'Click to copy';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 11px;
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
}

/* ===== Tool Card ===== */
.tool-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.tool-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all var(--transition);
}

.tool-card:hover {
    border-color: var(--border-active);
    box-shadow: var(--shadow-card);
}

.tool-name {
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 14px;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.tool-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.5;
}

/* ===== Node Card ===== */
.node-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}

.node-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    transition: all var(--transition);
}

.node-card:hover {
    border-color: var(--border-active);
}

.node-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.node-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.node-meta-item {
    font-size: 13px;
}

.node-meta-label {
    color: var(--text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 2px;
}

.node-meta-value {
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===== Empty State ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-muted);
}

.empty-state svg {
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 14px;
}

/* ===== Toast ===== */
.toast-container {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 12px 20px;
    font-size: 14px;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s;
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 280px;
}

.toast.toast-success { border-left: 3px solid var(--success); }
.toast.toast-error { border-left: 3px solid var(--danger); }

/* ===== Skeleton Loading ===== */
.skeleton {
    background: linear-gradient(90deg, var(--bg-card) 25%, var(--bg-card-hover) 50%, var(--bg-card) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius-xs);
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(40px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

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

.animate-in {
    animation: slideUp 0.4s ease;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .mobile-toggle {
        display: flex;
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
        padding-top: 64px;
    }

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

    .tool-grid,
    .node-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        width: 95vw;
        padding: 24px;
    }

    .data-table {
        font-size: 13px;
    }

    .data-table th,
    .data-table td {
        padding: 10px 12px;
    }
}

@media (max-width: 480px) {
    .card-grid {
        grid-template-columns: 1fr;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }
}