:root {
  --bg-body: #0b1120;
  --bg-surface: #111827;
  --bg-card: #1e293b;
  --bg-elevated: #273549;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --primary: #10b981;
  --primary-hover: #059669;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --danger: #ef4444;
  --warning: #f59e0b;
  --purple: #8b5cf6;
  --sidebar-width: 268px;
  --sidebar-collapsed-width: 74px;
  --radius: 12px;
  --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.45);
}

[data-theme="light"] {
  --bg-body: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-card: #ffffff;
  --bg-elevated: #f8fafc;
  --text-main: #0f172a;
  --text-muted: #475569;
  --border-color: #cbd5e1;
  --primary: #059669;
  --primary-hover: #047857;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --shadow: 0 8px 20px -4px rgba(15, 23, 42, 0.08);
}

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

html, body {
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.5;
}

a {
  color: var(--accent);
  text-decoration: none;
}

.app-layout {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  transition: width 0.25s ease, transform 0.25s ease;
  flex-shrink: 0;
  z-index: 1000;
}

.sidebar.collapsed {
  width: var(--sidebar-collapsed-width);
}

.sidebar.collapsed .nav-label,
.sidebar.collapsed .brand-subtitle,
.sidebar.collapsed .brand-title-text {
  display: none;
}

.sidebar-header {
  padding: 18px 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 0.98rem;
  letter-spacing: 0.4px;
  color: var(--primary);
}

.brand-badge {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  flex-shrink: 0;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 9px;
  color: var(--text-muted);
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.18s, color 0.18s;
}

.nav-item:hover,
.nav-item.active {
  background: var(--bg-elevated);
  color: var(--text-main);
}

.nav-item.active {
  border-left: 3px solid var(--primary);
  color: var(--primary);
}

.nav-icon {
  width: 22px;
  text-align: center;
  font-size: 1rem;
  flex-shrink: 0;
}

/* Main Content */
.main-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  height: 66px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 0 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 900;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.content-area {
  padding: 22px;
  flex: 1;
  max-width: 1600px;
  width: 100%;
  margin: 0 auto;
}

/* Cards & Grids */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 22px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}

.card-title {
  font-size: 1.04rem;
  font-weight: 700;
}

.kpi-value {
  font-size: 1.7rem;
  font-weight: 800;
  margin-top: 6px;
}

.kpi-label {
  font-size: 0.82rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

/* Buttons & Inputs */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: 8px;
  border: 1px solid transparent;
  font-size: 0.86rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.18s ease;
}

.btn-primary {
  background: var(--primary);
  color: #ffffff;
}
.btn-primary:hover {
  background: var(--primary-hover);
}

.btn-accent {
  background: var(--accent);
  color: #ffffff;
}
.btn-accent:hover {
  background: var(--accent-hover);
}

.btn-danger {
  background: var(--danger);
  color: #ffffff;
}

.btn-outline {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
}
.btn-outline:hover {
  background: var(--bg-elevated);
}

.btn-sm {
  padding: 5px 10px;
  font-size: 0.78rem;
}

.input, select, textarea {
  width: 100%;
  padding: 9px 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  background: var(--bg-elevated);
  color: var(--text-main);
  font-size: 0.88rem;
}

.form-group {
  margin-bottom: 12px;
}

.form-group label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-muted);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.74rem;
  font-weight: 700;
}
.badge-success { background: rgba(16, 185, 129, 0.18); color: #34d399; }
.badge-warning { background: rgba(245, 158, 11, 0.18); color: #fbbf24; }
.badge-danger  { background: rgba(239, 68, 68, 0.18); color: #f87171; }
.badge-info    { background: rgba(59, 130, 246, 0.18); color: #60a5fa; }
.badge-purple  { background: rgba(139, 92, 246, 0.18); color: #c084fc; }

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

table.data-table th,
table.data-table td {
  padding: 11px 12px;
  border-bottom: 1px solid var(--border-color);
  text-align: left;
  vertical-align: middle;
}

table.data-table th {
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.74rem;
  background: var(--bg-elevated);
}

.tab-pane {
  display: none;
}
.tab-pane.active {
  display: block;
}

/* Chat & Envelope Visualizer */
.chat-box {
  height: 360px;
  overflow-y: auto;
  background: var(--bg-body);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-msg {
  max-width: 82%;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 0.87rem;
}

.chat-msg.outgoing {
  align-self: flex-end;
  background: rgba(16, 185, 129, 0.18);
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.chat-msg.incoming {
  align-self: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
}

.code-block {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.78rem;
  background: #090d16;
  color: #a7f3d0;
  padding: 12px;
  border-radius: 8px;
  border: 1px solid var(--border-color);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.video-stage {
  background: #050811;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  min-height: 240px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.video-stage video {
  width: 100%;
  max-height: 280px;
  object-fit: cover;
}

/* Mobile Responsive */
.mobile-menu-btn {
  display: none;
}

@media (max-width: 992px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
  }
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
  }
  .sidebar.mobile-open {
    transform: translateX(0);
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .content-area {
    padding: 14px;
  }
}