:root {
  --primary: #7c3aed;
  --primary-dark: #0077b6;
  --black: #121212;
  --dark-gray: #1e1e1e;
  --medium-gray: #2d2d2d;
  --light-gray: #3d3d3d;
  --text-light: #f0f0f0;
  --text-dark: #333333;
  --white: #ffffff;
  --success: #2ecc71;
  --warning: #f39c12;
  --danger: #e74c3c;
  --chart-1: #7c3aed;
  --chart-2: #2ecc71;
  --chart-3: #f1c40f;
  --chart-4: #9b59b6;
  --chart-5: #e74c3c;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.25);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background-color: var(--black);
  color: var(--text-light);
  line-height: 1.6;
  transition: var(--transition);
  font-weight: 400;
  letter-spacing: 0.3px;
}

.app-container {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* ==================== SIDEBAR ==================== */
.sidebar {
  width: 280px;
  background-color: var(--dark-gray);
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  height: 100vh;
  position: fixed;
  transition: var(--transition);
  transform: translateX(-100%);
  z-index: 100;
  display: flex;
  flex-direction: column;
  box-shadow: 4px 0 20px rgba(0, 0, 0, 0.3);
}

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

.sidebar-header {
  padding: 24px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo img {
  max-width: 180px;
  height: auto;
  transition: var(--transition);
  filter: brightness(1);
}

.logo img:hover {
  filter: brightness(1.1);
}

.no-context-menu {
  -webkit-user-select: none;
  user-select: none;
  -webkit-user-drag: none;
  pointer-events: none;
}

.close-menu {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.close-menu:hover {
  color: var(--primary);
  background-color: rgba(124, 58, 237, 0.1);
  transform: rotate(90deg);
}

.sidebar-content {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.sidebar-content::-webkit-scrollbar {
  width: 6px;
}

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

.sidebar-content::-webkit-scrollbar-thumb {
  background: rgba(124, 58, 237, 0.3);
  border-radius: 3px;
}

.sidebar-content::-webkit-scrollbar-thumb:hover {
  background: rgba(124, 58, 237, 0.5);
}

.menu-section {
  margin-bottom: 32px;
}

.menu-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 16px;
  letter-spacing: 1.5px;
  font-weight: 700;
  opacity: 0.8;
}

.menu-list {
  list-style: none;
}

.menu-list li {
  margin-bottom: 6px;
  position: relative;
}

.menu-list a {
  display: flex;
  align-items: center;
  padding: 12px 14px;
  color: var(--text-light);
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
}

.menu-list a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background-color: var(--primary);
  border-radius: 0 3px 3px 0;
  opacity: 0;
  transition: var(--transition);
}

.menu-list a:hover {
  background-color: rgba(124, 58, 237, 0.1);
  color: var(--primary);
  padding-left: 18px;
}

.menu-list a:hover::before {
  opacity: 1;
}

.menu-list a i {
  margin-right: 12px;
  width: 20px;
  text-align: center;
  font-size: 1rem;
}

.menu-list .submenu-list {
  display: none;
  list-style: none;
  margin-left: 15px;
  margin-top: 6px;
  transition: var(--transition);
}

.menu-list .submenu.active .submenu-list {
  display: block;
}

.menu-list .submenu-list li {
  margin-bottom: 4px;
}

.menu-list .submenu-list a {
  padding: 10px 12px;
  font-size: 0.85rem;
  background-color: rgba(124, 58, 237, 0.05);
  border-left: 2px solid rgba(124, 58, 237, 0.3);
  font-weight: 400;
}

.menu-list .submenu-list a:hover {
  background-color: rgba(124, 58, 237, 0.15);
  border-left-color: var(--primary);
  padding-left: 16px;
}

.menu-list .submenu > a .arrow {
  margin-left: auto;
  transition: transform 0.3s ease;
  font-size: 0.8rem;
}

.menu-list .submenu.active > a .arrow {
  transform: rotate(180deg);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
  flex: 1;
  margin-left: 0;
  padding: 24px;
  transition: var(--transition);
  background: linear-gradient(135deg, var(--black) 0%, rgba(30, 30, 30, 0.5) 100%);
}

.main-header {
  display: flex;
  align-items: center;
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--dark-gray) 0%, rgba(30, 30, 30, 0.8) 100%);
  border-radius: var(--border-radius);
  margin-bottom: 28px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-md);
}

.menu-toggle {
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  margin-right: 20px;
  cursor: pointer;
  transition: var(--transition);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.menu-toggle:hover {
  color: var(--primary);
  background-color: rgba(124, 58, 237, 0.1);
}

.header-title {
  flex: 1;
}

.header-title h1 {
  font-size: 1.8rem;
  margin-bottom: 6px;
  background: linear-gradient(90deg, var(--primary), #a78bfa);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.header-title p {
  font-size: 0.9rem;
  color: var(--text-light);
  opacity: 0.6;
  font-weight: 400;
}

.theme-selector {
  display: flex;
  margin-left: auto;
  gap: 10px;
}

.theme-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 2px solid transparent;
  background-color: rgba(124, 58, 237, 0.1);
  color: var(--text-light);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  font-size: 1rem;
}

.theme-btn:hover {
  transform: scale(1.15);
  background-color: rgba(124, 58, 237, 0.2);
}

.theme-btn.active {
  border-color: var(--primary);
  background-color: rgba(124, 58, 237, 0.25);
  box-shadow: 0 0 12px rgba(124, 58, 237, 0.4);
}

/* ==================== METRICS GRID ==================== */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.metric-card {
  background: linear-gradient(135deg, var(--dark-gray) 0%, rgba(30, 30, 30, 0.8) 100%);
  border-radius: var(--border-radius);
  padding: 24px;
  transition: var(--transition);
  border: 1px solid rgba(124, 58, 237, 0.15);
  border-left: 4px solid var(--primary);
  position: relative;
  overflow: hidden;
}

.metric-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
  pointer-events: none;
  transition: var(--transition);
}

.metric-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(124, 58, 237, 0.3);
}

.metric-card:hover::before {
  right: -30%;
}

.metric-header {
  display: flex;
  align-items: center;
  margin-bottom: 18px;
  position: relative;
  z-index: 1;
}

.metric-header i {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.2) 0%, rgba(124, 58, 237, 0.05) 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-right: 16px;
  font-size: 1.3rem;
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.metric-header h3 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.metric-value {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 8px;
  position: relative;
  z-index: 1;
  letter-spacing: -1px;
}

.metric-value.status-up {
  color: var(--success);
}

.metric-value.status-warning {
  color: var(--warning);
}

.metric-value.status-down {
  color: var(--danger);
}

.metric-description {
  font-size: 0.85rem;
  color: var(--text-light);
  opacity: 0.65;
  font-weight: 400;
  position: relative;
  z-index: 1;
}

/* ==================== CHARTS SECTION ==================== */
.charts-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 20px;
  margin-bottom: 32px;
}

.chart-container {
  background: linear-gradient(135deg, var(--dark-gray) 0%, rgba(30, 30, 30, 0.8) 100%);
  border-radius: var(--border-radius);
  padding: 24px;
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-md);
}

.chart-container:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(124, 58, 237, 0.2);
}

.chart-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.chart-header h3 {
  display: flex;
  align-items: center;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.2px;
}

.chart-header h3 i {
  margin-right: 10px;
  color: var(--primary);
  font-size: 1.2rem;
}

.chart-legend {
  font-size: 0.8rem;
  color: var(--text-light);
  opacity: 0.65;
  font-weight: 500;
}

.legend-cpu,
.legend-memory,
.legend-network,
.legend-load,
.legend-speed {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 3px;
  margin-right: 6px;
}

.legend-cpu {
  background-color: var(--chart-1);
}

.legend-memory {
  background-color: var(--chart-2);
}

.legend-network {
  background-color: var(--chart-3);
}

.legend-load {
  background-color: var(--chart-4);
}

.legend-speed {
  background-color: var(--chart-5);
}

.chart-wrapper {
  height: 280px;
  position: relative;
}

/* ==================== SYSTEM INFO ==================== */
.system-info {
  background: linear-gradient(135deg, var(--dark-gray) 0%, rgba(30, 30, 30, 0.8) 100%);
  border-radius: var(--border-radius);
  padding: 28px;
  margin-bottom: 32px;
  border: 1px solid rgba(255, 255, 255, 0.05);
  box-shadow: var(--shadow-md);
}

.system-info h2 {
  display: flex;
  align-items: center;
  font-size: 1.3rem;
  margin-bottom: 24px;
  font-weight: 700;
  letter-spacing: 0.2px;
}

.system-info h2 i {
  margin-right: 12px;
  color: var(--primary);
  font-size: 1.4rem;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.info-item {
  margin-bottom: 0;
}

.info-item label {
  display: block;
  font-size: 0.8rem;
  color: var(--text-light);
  opacity: 0.6;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
}

.info-item span {
  font-size: 1.1rem;
  font-weight: 600;
  word-break: break-all;
  color: var(--primary);
  letter-spacing: -0.3px;
}

/* ==================== FOOTER ==================== */
.main-footer {
  text-align: center;
  padding: 24px;
  color: var(--text-light);
  opacity: 0.55;
  font-size: 0.85rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  font-weight: 500;
  letter-spacing: 0.3px;
}

/* ==================== ANIMATIONS ==================== */
.loading-spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 3px solid rgba(124, 58, 237, 0.2);
  border-radius: 50%;
  border-top-color: var(--primary);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==================== LIGHT MODE ==================== */
body.light-mode {
  --black: #f8f9fa;
  --dark-gray: #ffffff;
  --medium-gray: #e0e0e0;
  --light-gray: #d0d0d0;
  --text-light: #333333;
  --text-dark: #121212;
  background: linear-gradient(135deg, #f8f9fa 0%, #f0f1f3 100%);
  color: var(--text-light);
}

body.light-mode .sidebar {
  background-color: var(--dark-gray);
  border-right: 1px solid rgba(0, 0, 0, 0.08);
  box-shadow: 4px 0 20px rgba(0, 0, 0, 0.08);
}

body.light-mode .sidebar-header {
  border-bottom: 1px solid rgba(0, 0, 0, 0.08);
}

body.light-mode .main-header,
body.light-mode .metric-card,
body.light-mode .chart-container,
body.light-mode .system-info {
  background: linear-gradient(135deg, #ffffff 0%, #f5f6f7 100%);
  border-color: rgba(0, 0, 0, 0.08);
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

body.light-mode .main-content {
  background: linear-gradient(135deg, #f8f9fa 0%, #f0f1f3 100%);
}

body.light-mode .menu-list a {
  color: var(--text-light);
}

body.light-mode .menu-list a:hover {
  background-color: rgba(124, 58, 237, 0.08);
  color: var(--primary);
}

body.light-mode .metric-description,
body.light-mode .chart-legend,
body.light-mode .info-item label,
body.light-mode .main-footer {
  color: var(--text-light);
  opacity: 0.65;
}

body.light-mode .metric-card:hover,
body.light-mode .chart-container:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

body.light-mode .header-title p {
  color: var(--text-light);
  opacity: 0.65;
}

body.light-mode .theme-btn {
  background-color: rgba(124, 58, 237, 0.08);
  color: var(--text-light);
}

body.light-mode .theme-btn:hover {
  background-color: rgba(124, 58, 237, 0.15);
}

body.light-mode .theme-btn.active {
  background-color: rgba(124, 58, 237, 0.2);
}

body.light-mode .metric-header i {
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.12) 0%, rgba(124, 58, 237, 0.05) 100%);
}

body.light-mode .menu-list .submenu-list a {
  background-color: rgba(124, 58, 237, 0.05);
  border-left-color: rgba(124, 58, 237, 0.3);
}

body.light-mode .menu-list .submenu-list a:hover {
  background-color: rgba(124, 58, 237, 0.12);
}

body.light-mode .close-menu:hover {
  background-color: rgba(124, 58, 237, 0.1);
}

body.light-mode .menu-toggle:hover {
  background-color: rgba(124, 58, 237, 0.1);
}

body.light-mode .main-footer {
  border-top: 1px solid rgba(0, 0, 0, 0.08);
}

/* ==================== BLUE MODE ==================== */
body.blue-mode {
  --black: #0a192f;
  --dark-gray: #172a45;
  --medium-gray: #303f60;
  --light-gray: #475f8c;
  --text-light: #e6f1ff;
  --text-dark: #a8b2d1;
  --primary: #64ffda;
  --primary-dark: #52d1b2;
  background: linear-gradient(135deg, #0a192f 0%, #0d1f35 100%);
  color: var(--text-light);
}

body.blue-mode .sidebar {
  background-color: var(--dark-gray);
  border-right: 1px solid rgba(100, 255, 218, 0.1);
}

body.blue-mode .main-header,
body.blue-mode .metric-card,
body.blue-mode .chart-container,
body.blue-mode .system-info {
  background: linear-gradient(135deg, #172a45 0%, #0f1f35 100%);
  border-color: rgba(100, 255, 218, 0.15);
}

body.blue-mode .main-content {
  background: linear-gradient(135deg, #0a192f 0%, #0d1f35 100%);
}

body.blue-mode .menu-list a {
  color: var(--text-dark);
}

body.blue-mode .menu-list a:hover {
  background-color: rgba(100, 255, 218, 0.1);
  color: var(--primary);
}

body.blue-mode .metric-description,
body.blue-mode .chart-legend,
body.blue-mode .info-item label,
body.blue-mode .main-footer {
  color: var(--text-dark);
}

body.blue-mode .header-title p {
  color: var(--text-dark);
}

body.blue-mode .theme-btn {
  background-color: rgba(100, 255, 218, 0.1);
}

body.blue-mode .theme-btn:hover {
  background-color: rgba(100, 255, 218, 0.15);
}

body.blue-mode .theme-btn.active {
  background-color: rgba(100, 255, 218, 0.2);
  border-color: var(--primary);
}

body.blue-mode .metric-header i {
  background: linear-gradient(135deg, rgba(100, 255, 218, 0.15) 0%, rgba(100, 255, 218, 0.05) 100%);
  color: var(--primary);
  border-color: rgba(100, 255, 218, 0.2);
}

body.blue-mode .menu-list .submenu-list a {
  background-color: rgba(100, 255, 218, 0.05);
  border-left-color: rgba(100, 255, 218, 0.3);
}

body.blue-mode .menu-list .submenu-list a:hover {
  background-color: rgba(100, 255, 218, 0.12);
}

body.blue-mode .metric-card {
  border-left-color: var(--primary);
}

body.blue-mode .info-item span {
  color: var(--primary);
}

body.blue-mode .header-title h1 {
  background: linear-gradient(90deg, var(--primary), #4dd0e1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ==================== NEUTRAL MODE ==================== */
body.neutral-mode {
  --black: #f5f5f5;
  --dark-gray: #e0e0e0;
  --medium-gray: #bdbdbd;
  --light-gray: #9e9e9e;
  --text-light: #212121;
  --text-dark: #424242;
  --primary: #616161;
  --primary-dark: #424242;
  background: linear-gradient(135deg, #f5f5f5 0%, #eeeeee 100%);
  color: var(--text-light);
}

body.neutral-mode .sidebar {
  background-color: var(--dark-gray);
  border-right: 1px solid rgba(0, 0, 0, 0.1);
}

body.neutral-mode .main-header,
body.neutral-mode .metric-card,
body.neutral-mode .chart-container,
body.neutral-mode .system-info {
  background: linear-gradient(135deg, #e0e0e0 0%, #d8d8d8 100%);
  border-color: rgba(0, 0, 0, 0.1);
}

body.neutral-mode .main-content {
  background: linear-gradient(135deg, #f5f5f5 0%, #eeeeee 100%);
}

body.neutral-mode .menu-list a {
  color: var(--text-light);
}

body.neutral-mode .menu-list a:hover {
  background-color: rgba(97, 97, 97, 0.1);
  color: var(--primary);
}

body.neutral-mode .metric-description,
body.neutral-mode .chart-legend,
body.neutral-mode .info-item label,
body.neutral-mode .main-footer {
  color: var(--text-light);
}

body.neutral-mode .header-title p {
  color: var(--text-dark);
}

body.neutral-mode .theme-btn {
  background-color: rgba(97, 97, 97, 0.1);
}

body.neutral-mode .theme-btn:hover {
  background-color: rgba(97, 97, 97, 0.15);
}

body.neutral-mode .theme-btn.active {
  background-color: rgba(97, 97, 97, 0.2);
  border-color: var(--primary);
}

body.neutral-mode .metric-header i {
  background: linear-gradient(135deg, rgba(97, 97, 97, 0.12) 0%, rgba(97, 97, 97, 0.05) 100%);
  color: var(--primary);
  border-color: rgba(97, 97, 97, 0.2);
}

body.neutral-mode .menu-list .submenu-list a {
  background-color: rgba(97, 97, 97, 0.05);
  border-left-color: rgba(97, 97, 97, 0.3);
}

body.neutral-mode .menu-list .submenu-list a:hover {
  background-color: rgba(97, 97, 97, 0.12);
}

body.neutral-mode .metric-card {
  border-left-color: var(--primary);
}

body.neutral-mode .info-item span {
  color: var(--primary);
}

/* ==================== PINK MODE ==================== */
body.pink-mode {
  --black: #1a1a2e;
  --dark-gray: #16213e;
  --medium-gray: #0f3460;
  --light-gray: #533483;
  --text-light: #e94560;
  --text-dark: #f8a1d1;
  --primary: #e94560;
  --primary-dark: #d13354;
  background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1e 100%);
  color: var(--text-dark);
}

body.pink-mode .sidebar {
  background-color: var(--dark-gray);
  border-right: 1px solid rgba(233, 69, 96, 0.1);
}

body.pink-mode .main-header,
body.pink-mode .metric-card,
body.pink-mode .chart-container,
body.pink-mode .system-info {
  background: linear-gradient(135deg, #16213e 0%, #0f1a2e 100%);
  border-color: rgba(233, 69, 96, 0.15);
}

body.pink-mode .main-content {
  background: linear-gradient(135deg, #1a1a2e 0%, #0f0f1e 100%);
}

body.pink-mode .menu-list a {
  color: var(--text-dark);
}

body.pink-mode .menu-list a:hover {
  background-color: rgba(233, 69, 96, 0.1);
  color: var(--primary);
}

body.pink-mode .metric-description,
body.pink-mode .chart-legend,
body.pink-mode .info-item label,
body.pink-mode .main-footer {
  color: var(--text-dark);
}

body.pink-mode .header-title p {
  color: var(--text-dark);
}

body.pink-mode .theme-btn {
  background-color: rgba(233, 69, 96, 0.1);
  color: var(--text-dark);
}

body.pink-mode .theme-btn:hover {
  background-color: rgba(233, 69, 96, 0.15);
}

body.pink-mode .theme-btn.active {
  background-color: rgba(233, 69, 96, 0.2);
  border-color: var(--primary);
}

body.pink-mode .metric-header i {
  background: linear-gradient(135deg, rgba(233, 69, 96, 0.15) 0%, rgba(233, 69, 96, 0.05) 100%);
  color: var(--primary);
  border-color: rgba(233, 69, 96, 0.2);
}

body.pink-mode .menu-list .submenu-list a {
  background-color: rgba(233, 69, 96, 0.05);
  border-left-color: rgba(233, 69, 96, 0.3);
}

body.pink-mode .menu-list .submenu-list a:hover {
  background-color: rgba(233, 69, 96, 0.12);
}

body.pink-mode .metric-card {
  border-left-color: var(--primary);
}

body.pink-mode .info-item span {
  color: var(--primary);
}

body.pink-mode .header-title h1 {
  background: linear-gradient(90deg, var(--primary), #f8a1d1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 992px) {
  .sidebar {
    width: 250px;
  }

  .charts-section {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .app-container {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
    height: auto;
    max-height: 80vh;
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  }

  .main-content {
    padding: 16px;
  }

  .metrics-grid,
  .charts-section,
  .info-grid {
    grid-template-columns: 1fr;
  }

  .main-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }

  .header-title {
    width: 100%;
  }

  .header-title h1 {
    font-size: 1.5rem;
  }

  .theme-selector {
    margin-left: 0;
    width: 100%;
    justify-content: flex-start;
  }

  .chart-wrapper {
    height: 220px;
  }

  .system-info h2 {
    font-size: 1.1rem;
  }

  .metric-card {
    padding: 18px;
  }

  .chart-container {
    padding: 18px;
  }

  .system-info {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 12px;
  }

  .main-header {
    padding: 16px;
  }

  .metrics-grid {
    gap: 12px;
  }

  .charts-section {
    gap: 12px;
  }

  .info-grid {
    gap: 16px;
  }

  .header-title h1 {
    font-size: 1.3rem;
  }

  .header-title p {
    font-size: 0.8rem;
  }

  .metric-card {
    padding: 16px;
  }

  .metric-value {
    font-size: 1.6rem;
  }

  .chart-wrapper {
    height: 180px;
  }

  .theme-btn {
    width: 36px;
    height: 36px;
    font-size: 0.9rem;
  }
}