:root {
  --bg-main: #f5f7fa;
  --bg-card: #ffffff;
  --bg-input: #f0f2f5;
  --border: #e2e8f0;
  --border-focus: #2563eb;
  --text-primary: #1a202c;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-light: #3b82f6;
  --accent-glow: rgba(37, 99, 235, 0.15);
  --accent-bg: rgba(37, 99, 235, 0.06);
  --green: #16a34a;
  --green-light: #22c55e;
  --green-glow: rgba(34, 197, 94, 0.2);
  --red: #dc2626;
  --red-glow: rgba(239, 68, 68, 0.15);
  --yellow: #d97706;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-main);
  color: var(--text-primary);
  min-height: 100vh;
}

.form-group { margin-bottom: 16px; }
.form-group label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.form-group input, .form-group select {
  width: 100%;
  padding: 10px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: all 0.2s ease;
}
.form-group input:focus, .form-group select:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: #fff;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  outline: none;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn-block { width: 100%; }

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-light));
  color: white;
  box-shadow: 0 2px 8px var(--accent-glow);
}
.btn-primary:hover { box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35); transform: translateY(-1px); }

.btn-danger {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  color: white;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
  background: var(--bg-input);
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: 6px;
}
.btn-sm:hover { color: var(--text-primary); border-color: var(--text-muted); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 10px;
  font-size: 13px;
}
.btn-ghost:hover { color: var(--accent); background: var(--accent-bg); }

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 32px;
  border-bottom: 1px solid var(--border);
  background: #ffffff;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}
.logo { display: flex; align-items: center; gap: 12px; }
.logo-text { font-size: 20px; font-weight: 700; color: var(--accent); }
.logo-sub { font-size: 14px; font-weight: 500; color: var(--text-muted); padding-left: 12px; border-left: 1px solid var(--border); }

.panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-sm);
}
.panel-header {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
.panel-header h2 { font-size: 16px; font-weight: 600; }

.connection-status {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 20px;
  background: var(--bg-main);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  transition: all 0.3s ease;
}
.status-dot.offline { background: var(--text-muted); }
.status-dot.connecting { background: var(--yellow); animation: pulse 1.5s infinite; }
.status-dot.online { background: var(--green-light); box-shadow: 0 0 6px var(--green-glow); animation: pulse 2s infinite; }
.status-dot.in-call { background: var(--accent); animation: pulse 1s infinite; }

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(1.3); }
}