:root {
  --bg: #f5f6fa;
  --surface: #ffffff;
  --border: #e4e7ec;
  --text: #1a1d29;
  --text-muted: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --success: #16a34a;
  --warning: #d97706;
  --warning-soft: #fffbeb;
  --sidebar-w: 248px;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.06), 0 1px 3px rgba(16, 24, 40, 0.08);
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

a {
  color: inherit;
  text-decoration: none;
}

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

code {
  background: var(--primary-soft);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.85em;
}

.app-shell {
  display: flex;
  min-height: 100vh;
}

/* --- Sidebar --- */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 20px 14px;
  position: sticky;
  top: 0;
  height: 100vh;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 10px 20px;
  font-weight: 700;
  font-size: 1.1rem;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
}

.nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
}

.nav-link:hover {
  background: var(--bg);
  color: var(--text);
}

.nav-link.active {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

.nav-icon {
  width: 18px;
  text-align: center;
  font-size: 0.9em;
}

.sidebar-footer {
  border-top: 1px solid var(--border);
  padding-top: 14px;
}

.admin-link {
  display: block;
  padding: 8px 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  border-radius: var(--radius);
}

.admin-link:hover {
  background: var(--bg);
  color: var(--text);
}

.sidebar-toggle {
  display: none;
}

.sidebar-backdrop {
  display: none;
}

/* --- Main --- */
.main {
  flex: 1;
  min-width: 0;
  padding: 28px 32px 48px;
}

.topbar {
  margin-bottom: 24px;
}

.topbar h1 {
  margin: 0;
  font-size: 1.5rem;
}

.page[hidden] {
  display: none;
}

.section-intro {
  color: var(--text-muted);
  max-width: 720px;
  margin-top: 0;
}

/* --- Cards / panels --- */
.card, .panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.panel {
  padding: 20px 22px;
}

.panel h2 {
  margin: 0 0 14px;
  font-size: 1.05rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  padding: 18px 20px;
}

.stat-card .stat-value {
  font-size: 1.8rem;
  font-weight: 700;
}

.stat-card .stat-label {
  color: var(--text-muted);
  font-size: 0.85rem;
  margin-top: 4px;
}

.skeleton {
  color: var(--text-muted);
  padding: 18px 20px;
}

.panel-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 16px;
}

@media (max-width: 900px) {
  .panel-grid {
    grid-template-columns: 1fr;
  }
}

.agent-list-compact .agent-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.agent-list-compact .agent-row:last-child {
  border-bottom: none;
}

.badge {
  font-size: 0.72rem;
  font-weight: 600;
  padding: 3px 9px;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.badge-enabled {
  background: #ecfdf5;
  color: var(--success);
}

.badge-disabled {
  background: var(--danger-soft);
  color: var(--danger);
}

.activity-list .activity-row {
  padding: 9px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.activity-list .activity-row:last-child {
  border-bottom: none;
}

.activity-row .activity-meta {
  color: var(--text-muted);
  font-size: 0.78rem;
}

/* --- AI Agents grid --- */
.agent-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
}

.agent-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.agent-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 0 1px var(--primary), var(--shadow);
}

.agent-card .agent-card-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.agent-card h3 {
  margin: 0;
  font-size: 1.02rem;
}

.agent-card .agent-dept {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.agent-card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  flex: 1;
}

/* --- Buttons --- */
.btn {
  border: none;
  border-radius: var(--radius);
  padding: 10px 18px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-dark);
}

.btn-secondary {
  background: var(--primary-soft);
  color: var(--primary-dark);
}

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

.btn-danger:hover:not(:disabled) {
  background: #fde2e2;
}

/* --- Voice Playground --- */
.playground {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 16px;
}

@media (max-width: 960px) {
  .playground {
    grid-template-columns: 1fr;
  }
}

.playground-status-row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.status-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--bg);
  font-size: 0.85rem;
  font-weight: 600;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--text-muted);
}

.status-dot.dot-connected { background: var(--success); }
.status-dot.dot-connecting { background: var(--warning); }
.status-dot.dot-error { background: var(--danger); }

.playground-controls {
  display: flex;
  gap: 10px;
  margin-bottom: 16px;
}

.banner {
  padding: 10px 14px;
  border-radius: var(--radius);
  font-size: 0.86rem;
  margin-bottom: 14px;
}

.banner[hidden] {
  display: none;
}

.banner-error {
  background: var(--danger-soft);
  color: var(--danger);
}

.banner-warning {
  background: var(--warning-soft);
  color: var(--warning);
}

.transcript {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  min-height: 280px;
  max-height: 440px;
  overflow-y: auto;
  padding: 16px;
}

.transcript-placeholder {
  margin: 0;
  font-size: 0.88rem;
}

.transcript-line {
  margin-bottom: 10px;
  font-size: 0.92rem;
  line-height: 1.4;
}

.transcript-line .speaker {
  font-weight: 700;
  margin-right: 6px;
}

.transcript-line.agent .speaker {
  color: var(--primary-dark);
}

.playground-side h2 {
  font-size: 1rem;
}

.fact-list {
  margin: 14px 0 0;
  padding-left: 18px;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.fact-list li {
  margin-bottom: 6px;
}

.empty-state p {
  max-width: 520px;
}

/* --- Responsive sidebar (mobile) --- */
@media (max-width: 860px) {
  .sidebar-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
    position: fixed;
    top: 14px;
    left: 14px;
    width: 38px;
    height: 38px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    z-index: 30;
  }

  .sidebar-toggle span {
    display: block;
    height: 2px;
    width: 18px;
    margin: 0 auto;
    background: var(--text);
  }

  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    z-index: 25;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
    box-shadow: var(--shadow);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-backdrop.open {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 20;
  }

  .main {
    padding: 76px 18px 40px;
  }

  .playground-side {
    order: -1;
  }
}