:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-card-hover: #283548;
  --bg-input: #0f172a;
  --border-color: #334155;
  --border-focus: #38bdf8;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-hover: #0284c7;
  --success: #10b981;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --warning: #f59e0b;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.5;
}

/* Header & Navbar */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.85rem 1.5rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.nav-brand h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-badge {
  font-size: 0.8rem;
  padding: 0.2rem 0.6rem;
  background-color: rgba(56, 189, 248, 0.15);
  color: var(--accent);
  border-radius: 9999px;
  border: 1px solid rgba(56, 189, 248, 0.3);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease-in-out;
}

.btn-primary {
  background-color: var(--accent);
  color: #0f172a;
}
.btn-primary:hover {
  background-color: var(--accent-hover);
  color: #ffffff;
}

.btn-secondary {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.05);
  border-color: var(--text-secondary);
}

.btn-success {
  background-color: var(--success);
  color: #ffffff;
}
.btn-success:hover {
  filter: brightness(1.1);
}

.btn-danger-outline {
  background-color: transparent;
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
}
.btn-danger-outline:hover {
  background-color: rgba(239, 68, 68, 0.15);
  border-color: var(--danger);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

/* App Container Layout */
.app-container {
  display: flex;
  height: calc(100vh - 65px);
  overflow: hidden;
}

.editor-main {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem 2rem;
}

.editor-sidebar {
  width: 420px;
  background-color: var(--bg-secondary);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.sidebar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-content {
  flex: 1;
  padding: 1rem;
  overflow-y: auto;
}

.yaml-viewer {
  width: 100%;
  height: 100%;
  background-color: var(--bg-primary);
  color: #38bdf8;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.85rem;
  padding: 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  resize: none;
  white-space: pre;
  tab-size: 2;
  user-select: text !important;
}

/* Device Cards */
.device-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
  transition: border-color 0.15s ease;
}

.device-card:hover {
  border-color: #475569;
}

.device-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(0, 0, 0, 0.15);
  border-top-left-radius: var(--radius-md);
  border-top-right-radius: var(--radius-md);
}

.device-header-left {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.chevron-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.35rem;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}
.chevron-btn:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.08);
}
.chevron-btn svg {
  transition: transform 0.2s ease;
}
.chevron-btn.is-collapsed svg {
  transform: rotate(-90deg);
}

.device-count-pill {
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.15rem 0.5rem;
  background-color: rgba(148, 163, 184, 0.15);
  color: var(--text-secondary);
  border-radius: 9999px;
  border: 1px solid rgba(148, 163, 184, 0.2);
}

.device-card.is-collapsed .device-header {
  border-bottom: none;
  border-bottom-left-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}

.device-title-input {
  background-color: transparent;
  border: 1px solid transparent;
  color: var(--text-primary);
  font-size: 1.15rem;
  font-weight: 700;
  padding: 0.3rem 0.5rem;
  border-radius: var(--radius-sm);
  width: 320px;
}
.device-title-input:focus {
  background-color: var(--bg-input);
  border-color: var(--border-focus);
  outline: none;
}

.device-body {
  padding: 1.25rem;
}

.entities-list {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1rem;
}

/* Entity Card */
.entity-card {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 1rem;
  border-left: 4px solid var(--accent);
}

.entity-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.85rem;
}

.entity-platform-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

/* Form Grid */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.85rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.form-control {
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  padding: 0.45rem 0.65rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  width: 100%;
}

.form-control:focus {
  border-color: var(--border-focus);
  outline: none;
}

.checkbox-group {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--text-primary);
  cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
  accent-color: var(--accent);
  width: 16px;
  height: 16px;
  cursor: pointer;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  background-color: var(--bg-card);
  border: 2px dashed var(--border-color);
  border-radius: var(--radius-lg);
  margin-top: 2rem;
}
.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.empty-state p {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* Modals */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(2px);
}

.modal-content {
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.75rem;
  width: 90%;
  max-width: 550px;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

.modal-content h3 {
  margin-bottom: 1rem;
}

.template-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.template-item {
  background-color: var(--bg-primary);
  border: 1px solid var(--border-color);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  text-align: left;
}
.template-item:hover {
  border-color: var(--accent);
  background-color: rgba(56, 189, 248, 0.08);
}
.template-item h4 {
  font-size: 0.95rem;
  margin-bottom: 0.2rem;
  color: var(--accent);
}
.template-item p {
  font-size: 0.78rem;
  color: var(--text-secondary);
}

.alert {
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: 0.875rem;
  user-select: text !important;
}
.alert-success {
  background-color: rgba(16, 185, 129, 0.15);
  border: 1px solid var(--success);
  color: #34d399;
}
.alert-danger {
  background-color: rgba(239, 68, 68, 0.15);
  border: 1px solid var(--danger);
  color: #f87171;
}