:root {
  --bg-dark: #0a0e17;
  --bg-surface: #111827;
  --bg-card: #151e33;
  --bg-card-hover: #1b2640;
  --border-color: #24314d;
  --text-main: #f3f4f6;
  --text-muted: #94a3b8;
  --accent-cyan: #00f2fe;
  --accent-purple: #8b5cf6;
  --accent-pink: #ec4899;
  --accent-green: #10b981;
  --accent-amber: #f59e0b;
  --accent-red: #ef4444;
  --glow-cyan: 0 0 15px rgba(0, 242, 254, 0.35);
  --glow-pink: 0 0 15px rgba(236, 72, 153, 0.35);
  --glow-purple: 0 0 15px rgba(139, 92, 246, 0.35);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: SFMono-Regular, Consolas, "Liberation Mono", Menlo, monospace;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-dark);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* TOP HEADER */
.topbar {
  background: rgba(17, 24, 39, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 50;
}

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

.logo-badge {
  background: linear-gradient(135deg, var(--accent-pink), var(--accent-purple));
  color: #fff;
  font-weight: 800;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 8px;
  box-shadow: var(--glow-pink);
  letter-spacing: 0.5px;
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, #ffffff, var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.system-status {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 20px;
  font-weight: 600;
  font-size: 12px;
}

.badge-demo {
  background: rgba(245, 158, 11, 0.15);
  color: #fbbf24;
  border: 1px solid rgba(245, 158, 11, 0.4);
}

.badge-online {
  background: rgba(16, 185, 129, 0.15);
  color: #34d399;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.pulse-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #10b981;
  box-shadow: 0 0 8px #10b981;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 8px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* APP WRAPPER */
.app-container {
  display: flex;
  flex: 1;
  min-height: calc(100vh - 65px);
}

/* SIDEBAR */
.sidebar {
  width: 250px;
  background-color: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  padding: 20px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
  transition: all 0.2s ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.nav-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

.nav-item.active {
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.2), rgba(0, 242, 254, 0.1));
  color: var(--accent-cyan);
  border-color: rgba(0, 242, 254, 0.3);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.15);
}

.nav-icon {
  font-size: 18px;
  width: 22px;
  text-align: center;
}

/* MAIN CONTENT */
.main-content {
  flex: 1;
  padding: 28px;
  overflow-y: auto;
  max-width: 1400px;
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
  animation: fadeIn 0.25s ease-in-out;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* HERO BANNER */
.hero-card {
  background: linear-gradient(135deg, rgba(30, 41, 69, 0.8), rgba(17, 24, 39, 0.95));
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}

.hero-info h2 {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 6px;
}

.hero-info p {
  color: var(--text-muted);
  font-size: 14px;
}

.quick-bar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

/* BUTTONS */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-cyan {
  background: linear-gradient(135deg, #00f2fe, #4facfe);
  color: #000;
  box-shadow: var(--glow-cyan);
}

.btn-cyan:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-pink {
  background: linear-gradient(135deg, #ff0844, #ffb199);
  color: #fff;
  box-shadow: var(--glow-pink);
}

.btn-pink:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-purple {
  background: linear-gradient(135deg, #8b5cf6, #6366f1);
  color: #fff;
  box-shadow: var(--glow-purple);
}

.btn-purple:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
}

.btn-secondary {
  background-color: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background-color: var(--bg-card-hover);
  border-color: #3b82f6;
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.2);
  color: #f87171;
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
  background-color: rgba(239, 68, 68, 0.4);
}

/* GRID LAYOUTS */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 18px 20px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s;
}

.stat-card:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 242, 254, 0.4);
}

.stat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
}

.stat-value {
  font-size: 26px;
  font-weight: 800;
  font-family: var(--font-mono);
  color: #fff;
}

.stat-subtitle {
  margin-top: 6px;
  font-size: 12px;
  color: var(--accent-cyan);
}

/* PANEL SECTIONS */
.section-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 24px;
  margin-bottom: 24px;
}

.panel-title {
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding-bottom: 12px;
}

/* FORMS & INPUTS */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
}

.form-input, .form-select {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  color: #fff;
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 8px rgba(0, 242, 254, 0.2);
}

/* TABLES */
.table-responsive {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13px;
}

.data-table th {
  background-color: var(--bg-card);
  color: var(--text-muted);
  font-weight: 700;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.data-table td {
  padding: 12px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  color: var(--text-main);
}

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

/* EVENT LOG */
.event-feed {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 380px;
  overflow-y: auto;
  padding-right: 6px;
}

.feed-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 13px;
  animation: slideIn 0.2s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-10px); }
  to { opacity: 1; transform: translateX(0); }
}

.feed-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.feed-icon {
  font-size: 20px;
}

.feed-user {
  font-weight: 700;
  color: #fff;
}

.feed-detail {
  color: var(--text-muted);
}

.feed-time {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #64748b;
}

/* OVERLAYS CARDS */
.overlay-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 20px;
}

.overlay-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 14px;
  transition: border-color 0.2s;
}

.overlay-card:hover {
  border-color: var(--accent-purple);
}

.overlay-card h3 {
  font-size: 16px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 8px;
}

.overlay-card p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}

.overlay-url {
  background: rgba(0, 0, 0, 0.4);
  padding: 8px 12px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-cyan);
  word-break: break-all;
  border: 1px dashed var(--border-color);
}

/* CODE BLOCK */
.code-block {
  background: #000;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: #a5b4fc;
  max-height: 350px;
  overflow: auto;
  white-space: pre;
}

/* TOAST ALERTS */
#toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 100;
}

.toast {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  box-shadow: 0 10px 25px rgba(0,0,0,0.6);
  border-radius: 8px;
  padding: 12px 18px;
  color: #fff;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 260px;
  animation: toastIn 0.3s ease;
}

@keyframes toastIn {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* RESPONSIVE */
@media (max-width: 900px) {
  .app-container {
    flex-direction: column;
  }
  .sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-color);
    padding: 10px;
  }
  .nav-item {
    white-space: nowrap;
    padding: 8px 12px;
    font-size: 13px;
  }
  .main-content {
    padding: 16px;
  }
  .hero-card {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .quick-bar {
    width: 100%;
  }
}