:root {
    --bg: #f8fafc;
    --sidebar-bg: #ffffff;
    --card-bg: #ffffff;
    --card-hover: #f1f5f9;
    --primary: #3b82f6;
    --primary-light: #dbeafe;
    --primary-hover: #2563eb;
    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.08);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.08);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.08);
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-sm: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
    display: flex;
}

/* ============ SIDEBAR ============ */
.sidebar {
    width: 280px;
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 1.5rem 0;
    flex-shrink: 0;
    box-shadow: 2px 0 20px rgba(0,0,0,0.05);
    transition: var(--transition);
    position: relative;
    z-index: 100;
}

.sidebar-header {
    padding: 0 1.5rem 1.5rem;
    border-bottom: 1px solid var(--border);
    margin-bottom: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary);
    transition: var(--transition);
}

.logo:hover {
    transform: translateX(2px);
}

.logo i {
    font-size: 1.6rem;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-sub {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-left: 2.2rem;
    margin-top: 2px;
}

.nav-section {
    padding: 0.5rem 1rem;
    flex: 1;
    overflow-y: auto;
}

.nav-label {
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-light);
    padding: 0 0.75rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0.75rem 0.75rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 2px;
    position: relative;
    overflow: hidden;
}

.nav-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: 3px;
    background: var(--primary);
    transform: translateX(-100%);
    transition: var(--transition);
}

.nav-item:hover {
    background: var(--primary-light);
    color: var(--primary);
    transform: translateX(2px);
}

.nav-item:hover::before {
    transform: translateX(0);
}

.nav-item.active {
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
    transform: translateX(2px);
}

.nav-item.active::before {
    transform: translateX(0);
    background: white;
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-item:hover i {
    transform: scale(1.1);
}

.nav-badge {
    margin-left: auto;
    background: var(--primary-light);
    color: var(--primary);
    font-size: 0.65rem;
    padding: 2px 8px;
    border-radius: 99px;
    font-weight: 600;
    animation: pulse 2s infinite;
}

.sidebar-footer {
    margin-top: auto;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.user-info:hover {
    background: var(--bg);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.9rem;
    color: white;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.user-details {
    flex: 1;
}

.user-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
}

.user-role {
    font-size: 0.7rem;
    color: var(--text-muted);
}

/* ============ MAIN CONTENT ============ */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ============ TOP BAR ============ */
.topbar {
    height: 70px;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    flex-shrink: 0;
    box-shadow: var(--shadow);
    position: relative;
    z-index: 50;
}

.menu-toggle {
    display: none;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    margin-right: 1rem;
}

.menu-toggle:hover {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.breadcrumb .current {
    color: var(--text);
    font-weight: 600;
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.search-box {
    position: relative;
}

.search-box input {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem 0.6rem 2.5rem;
    color: var(--text);
    font-size: 0.85rem;
    width: 300px;
    outline: none;
    transition: var(--transition);
}

.search-box input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    transform: translateY(-1px);
}

.search-box i {
    position: absolute;
    left: 0.75rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 0.85rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-sm);
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.btn-icon:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.notification-dot {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background: var(--danger);
    border-radius: 50%;
    border: 2px solid var(--sidebar-bg);
    animation: pulse 2s infinite;
}

/* ============ STATUS BAR ============ */
.status-bar {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 1rem 2rem;
    background: var(--sidebar-bg);
    border-bottom: 1px solid var(--border);
    font-size: 0.8rem;
    flex-wrap: wrap;
}

.status-item {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text-muted);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.status-item:hover {
    background: var(--bg);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    position: relative;
}

.status-indicator.online {
    background: var(--success);
    box-shadow: 0 0 12px var(--success);
}

.status-indicator.offline {
    background: var(--danger);
}

.status-indicator.connecting {
    background: var(--warning);
    animation: blink 1.5s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.status-value {
    color: var(--text);
    font-weight: 600;
}

/* ============ CONTENT AREA ============ */
.content {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
}

.content::-webkit-scrollbar {
    width: 8px;
}

.content::-webkit-scrollbar-track {
    background: transparent;
}

.content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.content::-webkit-scrollbar-thumb:hover {
    background: var(--text-light);
}

/* ============ STATS CARDS ============ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), #60a5fa);
    transform: translateX(-100%);
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.stat-card:hover::before {
    transform: translateX(0);
}

.stat-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    transition: var(--transition);
}

.stat-card:hover .stat-icon {
    transform: scale(1.1) rotate(5deg);
}

.stat-icon.blue { background: linear-gradient(135deg, var(--primary-light), #dbeafe); color: var(--primary); }
.stat-icon.green { background: linear-gradient(135deg, var(--success-bg), #d1fae5); color: var(--success); }
.stat-icon.orange { background: linear-gradient(135deg, var(--warning-bg), #fed7aa); color: var(--warning); }
.stat-icon.red { background: linear-gradient(135deg, var(--danger-bg), #fee2e2); color: var(--danger); }

.stat-info h3 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

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

/* ============ SECTION HEADER ============ */
.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #60a5fa);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary));
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

.btn-ghost {
    background: var(--sidebar-bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

.btn-ghost:hover {
    background: var(--primary-light);
    color: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

/* ============ DEVICES GRID ============ */
.devices-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.device-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.device-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--danger);
    transition: var(--transition);
}

.device-card.online::before {
    background: linear-gradient(90deg, var(--success), #34d399);
}

.device-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.device-card:hover::before {
    height: 6px;
}

.device-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.device-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.device-avatar {
    width: 48px;
    height: 48px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--primary-light), #eff6ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary);
    border: 2px solid var(--border);
    transition: var(--transition);
}

.device-card.online .device-avatar {
    border-color: var(--success);
    background: linear-gradient(135deg, var(--success-bg), #ecfdf5);
    color: var(--success);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.device-card:hover .device-avatar {
    transform: scale(1.1) rotate(5deg);
}

.device-meta h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 4px;
}

.device-meta span {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 4px;
}

.device-status-badge {
    padding: 6px 12px;
    border-radius: 99px;
    font-size: 0.7rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.device-status-badge.online {
    background: var(--success-bg);
    color: var(--success);
    box-shadow: 0 2px 8px rgba(16, 185, 129, 0.2);
}

.device-status-badge.offline {
    background: var(--danger-bg);
    color: var(--danger);
}

.device-metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 1.25rem;
}

.metric {
    background: var(--bg);
    border-radius: 10px;
    padding: 0.75rem;
    text-align: center;
    transition: var(--transition);
}

.metric:hover {
    background: var(--card-hover);
    transform: translateY(-2px);
}

.metric-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 2px;
}

.metric-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.device-actions {
    display: flex;
    gap: 10px;
}

.device-btn {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 0.75rem;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    color: white;
    position: relative;
    overflow: hidden;
}

.device-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.device-btn:active::before {
    width: 300px;
    height: 300px;
}

.device-btn.on {
    background: linear-gradient(135deg, var(--success), #34d399);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.device-btn.on:hover {
    background: linear-gradient(135deg, #059669, var(--success));
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.4);
    transform: translateY(-2px);
}

.device-btn.off {
    background: linear-gradient(135deg, var(--danger), #f87171);
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}

.device-btn.off:hover {
    background: linear-gradient(135deg, #dc2626, var(--danger));
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.4);
    transform: translateY(-2px);
}

.device-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    box-shadow: none !important;
    transform: none !important;
}

.device-btn.sending {
    animation: pulse 1s infinite;
}

/* ============ TERMINAL ============ */
.terminal-container {
    background: #1e293b;
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-top: 2rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border);
}

.terminal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid #334155;
}

.terminal-title {
    color: #94a3b8;
    font-size: 0.85rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}

.terminal-controls {
    display: flex;
    gap: 8px;
}

.terminal-btn {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: none;
    cursor: pointer;
    transition: var(--transition);
}

.terminal-btn.close { background: #ef4444; }
.terminal-btn.minimize { background: #f59e0b; }
.terminal-btn.maximize { background: #10b981; }

.terminal-btn:hover {
    transform: scale(1.2);
    box-shadow: 0 0 8px currentColor;
}

.terminal-body {
    background: #0f172a;
    border-radius: 8px;
    padding: 1rem;
    height: 300px;
    overflow-y: auto;
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.8rem;
    line-height: 1.5;
}

.terminal-output {
    color: #94a3b8;
    margin-bottom: 1rem;
}

.terminal-line {
    margin-bottom: 4px;
    word-wrap: break-word;
}

.terminal-line.command {
    color: #3b82f6;
}

.terminal-line.success {
    color: #10b981;
}

.terminal-line.error {
    color: #ef4444;
}

.terminal-line.info {
    color: #f59e0b;
}

.terminal-input-container {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 1rem;
}

.terminal-prompt {
    color: #3b82f6;
    font-weight: 600;
}

.terminal-input {
    flex: 1;
    background: transparent;
    border: none;
    color: #e2e8f0;
    font-family: inherit;
    font-size: inherit;
    outline: none;
}

.terminal-input::placeholder {
    color: #64748b;
}

/* ============ TOAST ============ */
.toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 12px;
    z-index: 1000;
}

.toast {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.85rem;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    transform: translateX(120%);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    min-width: 300px;
    backdrop-filter: blur(10px);
}

.toast.show {
    transform: translateX(0);
}

.toast.success { 
    border-left: 3px solid var(--success);
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.05), rgba(16, 185, 129, 0.02));
}
.toast.error { 
    border-left: 3px solid var(--danger);
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.05), rgba(239, 68, 68, 0.02));
}
.toast.info { 
    border-left: 3px solid var(--primary);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.05), rgba(59, 130, 246, 0.02));
}

/* ============ EMPTY STATE ============ */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

/* ============ RESPONSIVE ============ */
@media (max-width: 1200px) {
    .stats-grid { 
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 1rem;
    }
    .devices-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
        gap: 1rem;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -280px;
        top: 0;
        height: 100vh;
        z-index: 1000;
        box-shadow: 2px 0 20px rgba(0,0,0,0.1);
    }
    
    .sidebar.active {
        left: 0;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .topbar {
        padding: 0 1rem;
    }
    
    .search-box input {
        width: 200px;
    }
    
    .content {
        padding: 1rem;
    }
    
    .stats-grid { 
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .devices-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .status-bar {
        padding: 1rem;
        gap: 1rem;
    }
    
    .toast-container {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
    }
    
    .toast {
        min-width: auto;
    }
    
    .terminal-container {
        margin-top: 1rem;
        padding: 1rem;
    }
    
    .terminal-body {
        height: 200px;
        font-size: 0.75rem;
    }
}

@media (max-width: 480px) {
    .topbar {
        height: 60px;
    }
    
    .search-box {
        display: none;
    }
    
    .breadcrumb {
        font-size: 0.75rem;
    }
    
    .status-bar {
        font-size: 0.7rem;
    }
    
    .device-metrics {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .device-actions {
        flex-direction: column;
    }
}

/* ============ OVERLAY ============ */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 999;
    display: none;
}

.overlay.active {
    display: block;
}