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

:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a25;
  --bg-hover: #22222f;
  --border: #2a2a3a;
  --border-hover: #3a3a4f;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b5;
  --text-muted: #606075;
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #06b6d4;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --radius: 10px;
  --radius-sm: 6px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ── */

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  backdrop-filter: blur(12px);
}

header h1 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.header-actions {
  display: flex;
  gap: 6px;
}

.header-actions button {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.2px;
}

.header-actions button:hover {
  background: var(--bg-hover);
  border-color: var(--border-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.header-actions button:active {
  transform: translateY(0);
}

#btn-scan-real {
  background: linear-gradient(135deg, #059669, #047857);
  border-color: #047857;
  color: #fff;
  font-weight: 600;
}

#btn-scan-real:hover {
  background: linear-gradient(135deg, #047857, #065f46);
  border-color: #065f46;
  box-shadow: 0 0 20px rgba(16, 185, 129, 0.2);
}

#btn-discover {
  background: linear-gradient(135deg, #4f46e5, #4338ca);
  border-color: #4338ca;
  color: #fff;
}

#btn-discover:hover {
  background: linear-gradient(135deg, #4338ca, #3730a3);
  box-shadow: 0 0 20px rgba(99, 102, 241, 0.2);
}

#btn-clear {
  background: var(--bg-tertiary);
  border-color: var(--danger);
  color: var(--danger);
}

#btn-clear:hover {
  background: var(--danger);
  border-color: var(--danger);
  color: #fff;
}

/* ── Container ── */

.container {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* ── Sidebar ── */

.sidebar {
  width: 220px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  padding: 16px;
  overflow-y: auto;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}

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

.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.sidebar h2 {
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--text-muted);
  margin-bottom: 8px;
  margin-top: 16px;
  font-weight: 600;
}

.sidebar h2:first-child {
  margin-top: 0;
}

.hint {
  font-size: 11px;
  color: var(--text-muted);
  margin-bottom: 8px;
  line-height: 1.4;
}

/* ── Device List ── */

.device-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.device-template {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: grab;
  transition: all 0.2s ease;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  border: 1px solid transparent;
}

.device-template:hover {
  background: var(--bg-hover);
  border-color: var(--border);
  color: var(--text-primary);
  transform: translateX(2px);
}

.device-template:active {
  cursor: grabbing;
  transform: scale(0.98);
}

.device-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

/* ── Mode Buttons ── */

.mode-buttons {
  display: flex;
  gap: 4px;
  background: var(--bg-primary);
  padding: 3px;
  border-radius: var(--radius-sm);
}

.mode-btn {
  flex: 1;
  padding: 7px 10px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-btn:hover {
  color: var(--text-secondary);
}

.mode-btn.active {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

/* ── Properties Panel ── */

.properties {
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  padding: 10px;
  font-size: 11px;
  border: 1px solid var(--border);
}

.properties label {
  display: block;
  margin-bottom: 6px;
  color: var(--text-muted);
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.properties input, .properties select {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-secondary);
  color: var(--text-primary);
  font-size: 11px;
  margin-bottom: 8px;
  transition: border-color 0.2s ease;
}

.properties input:focus, .properties select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.properties .delete-btn {
  width: 100%;
  padding: 6px;
  border: 1px solid var(--danger);
  border-radius: 4px;
  background: transparent;
  color: var(--danger);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  margin-top: 8px;
  transition: all 0.2s ease;
}

.properties .delete-btn:hover {
  background: var(--danger);
  color: #fff;
}

/* ── Locations ── */

.locations {
  display: flex;
  flex-direction: column;
  gap: 4px;
  max-height: 180px;
  overflow-y: auto;
}

.location-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 11px;
  border: 1px solid transparent;
}

.location-item:hover {
  background: var(--bg-hover);
  border-color: var(--border);
}

.location-item.active {
  background: var(--accent-glow);
  border-color: var(--accent);
}

.location-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  flex-shrink: 0;
  box-shadow: 0 0 8px rgba(16, 185, 129, 0.4);
}

.location-dot.stale {
  background: var(--warning);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
}

.location-dot.offline {
  background: var(--text-muted);
  box-shadow: none;
}

.location-info {
  flex: 1;
  min-width: 0;
}

.location-name {
  font-weight: 500;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.location-meta {
  font-size: 10px;
  color: var(--text-muted);
  margin-top: 1px;
}

/* ── Catalyst Center Config ── */

.cat-center-config {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.cat-center-config label {
  display: block;
  font-size: 10px;
  color: var(--text-muted);
  margin-bottom: 2px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cat-center-config input {
  width: 100%;
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 11px;
  font-family: 'SF Mono', Monaco, monospace;
  transition: border-color 0.2s ease;
}

.cat-center-config input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

/* ── Canvas Area ── */

.canvas-area {
  flex: 1;
  position: relative;
  overflow: hidden;
  background: var(--bg-primary);
}

#topology-canvas {
  display: block;
  width: 100%;
  height: 100%;
  cursor: default;
}

#topology-canvas.mode-connect {
  cursor: crosshair;
}

/* ── Tooltip ── */

.tooltip {
  position: absolute;
  padding: 6px 10px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--text-primary);
  pointer-events: none;
  white-space: nowrap;
  z-index: 10;
  box-shadow: var(--shadow);
  backdrop-filter: blur(8px);
}

/* ── Scan Progress ── */

.scan-progress {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 24px;
  min-width: 320px;
  z-index: 20;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.scan-status {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 8px;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-primary);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 6px;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: 2px;
  width: 0%;
  transition: width 0.3s ease;
}

.scan-detail {
  font-size: 10px;
  color: var(--text-muted);
}

/* ── Device Count ── */

.device-count {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  font-size: 11px;
  color: var(--text-secondary);
  z-index: 5;
  backdrop-filter: blur(8px);
}

/* ── CIDR Input ── */

.cidr-input {
  position: absolute;
  top: 12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  z-index: 5;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 11px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(12px);
}

.cidr-input label {
  color: var(--text-muted);
  white-space: nowrap;
  font-weight: 500;
}

.cidr-input input {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 10px;
  color: var(--text-primary);
  font-family: 'SF Mono', Monaco, monospace;
  font-size: 11px;
  width: 240px;
  transition: border-color 0.2s ease;
}

.cidr-input input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-glow);
}

.cidr-input select {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 5px 10px;
  color: var(--text-primary);
  font-size: 11px;
  transition: border-color 0.2s ease;
}

.cidr-input select:focus {
  outline: none;
  border-color: var(--accent);
}

/* ── Utility ── */

.hidden {
  display: none !important;
}

.btn-primary {
  font-weight: 600;
}

/* ── Animations ── */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.scan-progress {
  animation: fadeIn 0.3s ease;
}

.location-item {
  animation: fadeIn 0.2s ease;
}

.progress-fill {
  animation: pulse 2s ease-in-out infinite;
}