:root {
  --bg-main: #f8fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
  --text-primary: #0f172a;
  --text-secondary: #64748b;
  --accent-primary: #4f46e5;
  --accent-hover: #4338ca;
  --accent-light: #e0e7ff;
  --success-color: #10b981;
  --danger-color: #ef4444;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body.light-mode {
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  min-height: 100vh;
  display: flex;
}

.saas-container {
  display: flex;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

/* Sidebar */
.sidebar {
  width: 260px;
  background-color: var(--card-bg);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 1.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border-color);
}

.brand-icon { font-size: 1.6rem; }
.brand-text h2 { font-size: 1.1rem; font-weight: 700; }

.badge-pro {
  font-size: 0.65rem;
  background: var(--accent-light);
  color: var(--accent-primary);
  padding: 0.15rem 0.4rem;
  border-radius: 6px;
  text-transform: uppercase;
}

.sidebar-menu {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 1.25rem;
  flex: 1;
}

.menu-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 10px;
  transition: all 0.15s ease;
}

.menu-item:hover, .menu-item.active {
  background-color: var(--bg-main);
  color: var(--accent-primary);
}

.sidebar-footer {
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

.user-pill { display: flex; align-items: center; gap: 0.75rem; }

.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-light);
  color: var(--accent-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
}

.user-info strong { display: block; font-size: 0.85rem; }
.user-info small { font-size: 0.75rem; color: var(--text-secondary); }

/* Workspace */
.workspace {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.navbar {
  height: 72px;
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar-title h1 { font-size: 1.25rem; font-weight: 700; }
.text-muted { color: var(--text-secondary); font-size: 0.85rem; }

.navbar-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.engine-switch {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--bg-main);
  padding: 0.35rem 0.6rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
}

.switch-label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); }
.toggle-buttons { display: flex; gap: 0.35rem; }

.engine-btn {
  padding: 0.4rem 0.75rem;
  border: none;
  background: transparent;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
}

.engine-btn.active {
  background: var(--card-bg);
  color: var(--accent-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.btn-primary {
  padding: 0.65rem 1.25rem;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 10px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s ease;
  white-space: nowrap;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  padding: 0.65rem 1.25rem;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
}

.btn-small {
  padding: 0.35rem 0.75rem;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

/* Studio Layout & Cards */
.view-content {
  flex: 1;
  padding: 1.75rem 2rem;
  overflow-y: auto;
}

.studio-layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  gap: 1.5rem;
  height: calc(100vh - 130px);
}

.agents-sidebar-card, .agent-editor-panel, .card-panel {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.02);
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.count-badge {
  font-size: 0.75rem;
  background: var(--bg-main);
  color: var(--text-secondary);
  padding: 0.2rem 0.5rem;
  border-radius: 12px;
}

.agents-list {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.agent-card-item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.15s ease;
}

.agent-card-item * {
  pointer-events: none;
}

.agent-card-item:hover, .agent-card-item.active {
  border-color: var(--accent-primary);
  background: var(--bg-main);
  box-shadow: 0 2px 8px rgba(79, 70, 229, 0.1);
}

.agent-avatar { font-size: 1.4rem; }
.agent-meta { flex: 1; }
.agent-meta strong { display: block; font-size: 0.85rem; }
.agent-meta small { font-size: 0.75rem; color: var(--text-secondary); }

.status-indicator.online {
  width: 8px;
  height: 8px;
  background: var(--success-color);
  border-radius: 50%;
}

/* Editor Tabs */
.editor-tabs {
  display: flex;
  gap: 0.75rem;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
  margin-bottom: 1.25rem;
}

.tab-link {
  padding: 0.5rem 0.85rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border-radius: 8px;
}

.tab-link.active {
  background: var(--bg-main);
  color: var(--accent-primary);
}

.form-group {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-row { display: flex; gap: 1rem; }
.form-group.half { flex: 1; }

label { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); }

input[type="text"], input[type="password"], textarea, select {
  width: 100%;
  padding: 0.7rem 0.85rem;
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.9rem;
}

/* Simulator & Text Chat Input */
.simulator-box {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  min-height: 400px;
}

.sim-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.75rem;
}

.sim-title { display: flex; align-items: center; gap: 0.5rem; }

.live-dot {
  width: 8px;
  height: 8px;
  background: var(--success-color);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--success-color);
}

.latency-badge {
  font-size: 0.75rem;
  background: var(--accent-light);
  color: var(--accent-primary);
  padding: 0.2rem 0.6rem;
  border-radius: 10px;
  font-weight: 600;
}

.sim-chat-log {
  flex: 1;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem;
  font-size: 0.85rem;
  min-height: 240px;
  max-height: 280px;
  overflow-y: auto;
}

.sim-chat-input-box {
  display: flex;
  gap: 0.75rem;
}

/* Modal Overlay */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-card {
  background: var(--card-bg);
  border-radius: 16px;
  width: 480px;
  padding: 1.5rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border-color);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.close-modal {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.modal-actions { margin-top: 1.25rem; }

.tab-panel { display: none; }
.tab-panel.active { display: block; }
.hidden { display: none !important; }