static/shared/css/layout-enhanced.css

/**
 * Enhanced Layout System
 * Modern sidebar, header, and responsive improvements
 */

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   🎨 ENHANCED SIDEBAR
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: linear-gradient(180deg, #ffffff 0%, #f8fdfc 100%);
  border-right: 1px solid var(--border-light);
  z-index: var(--z-sidebar);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  overflow-y: auto;
  overflow-x: hidden;
}

/* Sidebar Brand */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  border-bottom: 1px solid var(--border-light);
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.05), rgba(34, 211, 238, 0.05));
}

.brand-logo {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.brand-name {
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
}

.brand-tag {
  font-size: 9px;
  font-weight: 700;
  color: var(--teal);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Navigation Menu */
.nav-menu {
  flex: 1;
  padding: var(--space-3) 0;
  overflow-y: auto;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-item {
  margin: 0;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all 0.2s ease;
  position: relative;
  border-left: 3px solid transparent;
}

.nav-link::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background: var(--gradient-primary);
  transition: height 0.2s ease;
}

.nav-link:hover {
  background: linear-gradient(90deg, rgba(45, 212, 191, 0.08), transparent);
  color: var(--teal);
}

.nav-link:hover::before {
  height: 70%;
}

.nav-link.active {
  background: linear-gradient(90deg, rgba(45, 212, 191, 0.12), transparent);
  color: var(--teal);
  font-weight: 600;
}

.nav-link.active::before {
  height: 100%;
}

.nav-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: currentColor;
}

.nav-label {
  flex: 1;
}

.nav-badge {
  font-size: 9px;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  background: var(--danger);
  color: white;
  animation: badgePulse 2s ease-in-out infinite;
}

/* Sidebar Footer */
.sidebar-footer {
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--border-light);
  background: rgba(45, 212, 191, 0.03);
}

.sidebar-status {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gray-400);
}

.status-dot.online {
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
  animation: pulse 2s ease-in-out infinite;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   📱 MOBILE SIDEBAR
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

@media (max-width: 1024px) {
  .sidebar {
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.15);
  }
  
  /* Overlay */
  .sidebar.open::after {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(15, 41, 38, 0.5);
    z-index: -1;
  }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   🎯 ENHANCED HEADER
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

.header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  padding: var(--space-3) var(--space-4);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  max-width: var(--max-content-width);
  margin: 0 auto;
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Status Badge */
.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  transition: all 0.2s ease;
}

.status-badge[data-status="online"] {
  background: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.status-badge[data-status="offline"] {
  background: rgba(239, 68, 68, 0.1);
  border-color: var(--danger);
  color: var(--danger);
}

.status-badge[data-status="checking"] {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

.status-badge[data-status="degraded"] {
  background: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   📄 PAGE LAYOUT
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--border-light);
}

.page-title h1 {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.page-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.1), rgba(34, 211, 238, 0.1));
  border-radius: var(--radius-md);
}

.page-subtitle {
  font-size: var(--text-sm);
  color: var(--text-muted);
  margin: var(--space-1) 0 0 0;
}

.page-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.last-update {
  font-size: var(--text-xs);
  color: var(--text-muted);
  white-space: nowrap;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   📊 GRID LAYOUTS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-6);
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--space-4);
}

.col-span-12 { grid-column: span 12; }
.col-span-8 { grid-column: span 8; }
.col-span-6 { grid-column: span 6; }
.col-span-4 { grid-column: span 4; }
.col-span-3 { grid-column: span 3; }

@media (max-width: 1024px) {
  .col-span-8,
  .col-span-6,
  .col-span-4,
  .col-span-3 {
    grid-column: span 12;
  }
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   🌙 DARK MODE
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

[data-theme="dark"] .sidebar {
  background: linear-gradient(180deg, #0c1f1d 0%, #132e2a 100%);
  border-right-color: rgba(45, 212, 191, 0.2);
}

[data-theme="dark"] .sidebar-brand {
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.08), rgba(34, 211, 238, 0.08));
  border-bottom-color: rgba(45, 212, 191, 0.2);
}

[data-theme="dark"] .nav-link:hover {
  background: linear-gradient(90deg, rgba(45, 212, 191, 0.12), transparent);
}

[data-theme="dark"] .nav-link.active {
  background: linear-gradient(90deg, rgba(45, 212, 191, 0.18), transparent);
}

[data-theme="dark"] .sidebar-footer {
  background: rgba(45, 212, 191, 0.05);
  border-top-color: rgba(45, 212, 191, 0.2);
}

[data-theme="dark"] .header {
  background: rgba(12, 31, 29, 0.8);
  border-bottom-color: rgba(45, 212, 191, 0.2);
}

[data-theme="dark"] .page-header {
  border-bottom-color: rgba(45, 212, 191, 0.2);
}

[data-theme="dark"] .page-icon {
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.15), rgba(34, 211, 238, 0.15));
}