:root {
  --bg-main: #0b0d14;
  --bg-panel: #161925;
  --bg-panel-hover: #1e2233;
  --bg-input: #0f111a;
  
  --primary: #6366f1;
  --primary-hover: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  
  --secondary: #ec4899;
  --danger: #ef4444;
  --danger-hover: #dc2626;
  --success: #10b981;
  --warning: #f59e0b;
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dark: #cbd5e1;
  
  --border-color: #2a2e3f;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: radial-gradient(circle at top, #1a1e30, var(--bg-main) 70%);
  color: var(--text-main);
  height: 100vh;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #334155;
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: #475569;
}

/* Layout */
.app-container {
  display: flex;
  width: 85vw;
  height: 85vh;
  min-width: 800px;
  min-height: 500px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: 0 30px 60px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  background-color: var(--bg-main);
  resize: both;
}

.sidebar {
  width: 320px;
  min-width: 250px;
  max-width: 50vw;
  background-color: var(--bg-panel);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 10;
  box-shadow: 4px 0 24px rgba(0,0,0,0.2);
  resize: horizontal;
  overflow: hidden;
}

.sidebar-header {
  padding: 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--primary);
}

.logo h1 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.02em;
}

.logo i {
  font-size: 1.5rem;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.connections-list {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Connection Item */
.connection-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  gap: 8px;
}

.conn-item-content {
  flex: 1;
  overflow: hidden;
}

.conn-delete-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: var(--transition);
}

.conn-delete-btn:hover {
  color: var(--danger);
  background-color: rgba(239, 68, 68, 0.1);
}

.connection-item:hover {
  background-color: var(--bg-panel-hover);
  border-color: #3b425e;
  transform: translateY(-1px);
}

.connection-item.active {
  border-color: var(--primary);
  background-color: rgba(99, 102, 241, 0.05);
}

.connection-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background-color: var(--primary);
  box-shadow: 0 0 10px var(--primary-glow);
}

.conn-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
}

.conn-name {
  font-weight: 600;
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 80%;
}

.conn-url {
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-dot-small {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--text-muted);
}
.status-dot-small.connected { background-color: var(--success); box-shadow: 0 0 8px var(--success); }
.status-dot-small.connecting { background-color: var(--warning); animation: pulse 1.5s infinite; }
.status-dot-small.error { background-color: var(--danger); }

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  background: radial-gradient(circle at top right, #111422, var(--bg-main));
  position: relative;
  overflow: hidden;
}

.panels-container {
  display: flex;
  flex-direction: row;
  width: 100%;
  height: 100%;
  overflow-x: auto;
  gap: 1px;
  background-color: var(--border-color);
}

.connection-panel {
  flex: 1 1 auto;
  min-width: 250px;
  display: flex;
  flex-direction: column;
  background-color: var(--bg-main);
  height: 100%;
  border-right: 1px solid var(--border-color);
  resize: horizontal;
  overflow: hidden;
}

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  padding: 40px;
}

.empty-icon {
  font-size: 4rem;
  color: var(--border-color);
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--bg-panel-hover), var(--border-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.empty-state h2 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.empty-state p {
  color: var(--text-muted);
  max-width: 400px;
  margin-bottom: 30px;
  line-height: 1.6;
}

.active-state {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.hidden {
  display: none !important;
}

/* Connection Header */
.connection-header {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-color);
  background: rgba(22, 25, 37, 0.7);
  backdrop-filter: blur(12px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.header-top {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.header-bottom {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.connection-info {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 16px;
}

.input-group {
  display: flex;
  align-items: center;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
  flex: 1;
  transition: var(--transition);
}

.input-group:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.input-prefix {
  padding: 10px 14px;
  background-color: var(--bg-panel-hover);
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  border-right: 1px solid var(--border-color);
}

.input-url {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-main);
  padding: 10px 14px;
  font-size: 0.95rem;
  font-family: monospace;
  outline: none;
}

.status-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  background-color: rgba(148, 163, 184, 0.1);
  color: var(--text-muted);
}

.status-badge.connected {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--success);
}

.status-badge.connecting {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--warning);
}

.status-badge.error {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.status-badge.connected .status-dot { box-shadow: 0 0 8px var(--success); }
.status-badge.connecting .status-dot { animation: pulse 1.5s infinite; }

.connection-actions {
  display: flex;
  gap: 12px;
  align-items: center;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-weight: 600;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

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

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

.btn-glow {
  box-shadow: 0 0 20px var(--primary-glow);
}

.btn-secondary {
  background-color: var(--bg-panel-hover);
  color: var(--text-main);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover:not(:disabled) { background-color: #2a3045; }

.btn-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
}
.btn-danger:hover:not(:disabled) {
  background-color: var(--danger);
  color: white;
}

.btn-danger-text {
  background: transparent;
  color: var(--text-muted);
}
.btn-danger-text:hover {
  color: var(--danger);
  background-color: rgba(239, 68, 68, 0.1);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  transition: var(--transition);
  font-size: 1.2rem;
}

.btn-icon:hover {
  background-color: var(--bg-panel-hover);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 0.8rem;
}

/* Messages Area */
.messages-container {
  flex: 1;
  padding: 24px 30px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scroll-behavior: smooth;
}

.messages-empty {
  margin: auto;
  text-align: center;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  opacity: 0.5;
}

.messages-empty i {
  font-size: 3rem;
}

.message-wrapper {
  display: flex;
  flex-direction: column;
  max-width: 85%;
  animation: slideUp 0.3s ease;
}

.message-wrapper.sent {
  align-self: flex-end;
  align-items: flex-end;
}

.message-wrapper.received {
  align-self: flex-start;
  align-items: flex-start;
}

.message-wrapper.info {
  align-self: center;
  align-items: center;
  max-width: 100%;
  margin: 10px 0;
}

.message-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 4px;
  display: flex;
  gap: 8px;
  align-items: center;
}

.message-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-md);
  font-family: monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  word-wrap: break-word;
  white-space: pre-wrap;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.sent .message-bubble {
  background-color: var(--primary);
  color: white;
  border-bottom-right-radius: 4px;
}

.received .message-bubble {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  border-bottom-left-radius: 4px;
}

.info .message-bubble {
  background-color: transparent;
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  padding: 4px 12px;
  border: 1px solid var(--border-color);
  border-radius: 20px;
  box-shadow: none;
}

.info.error .message-bubble {
  color: var(--danger);
  border-color: rgba(239, 68, 68, 0.3);
  background-color: rgba(239, 68, 68, 0.05);
}

/* Input Area */
.input-area {
  padding: 20px 30px;
  background-color: var(--bg-panel);
  border-top: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

#message-input {
  width: 100%;
  height: 100px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px;
  color: var(--text-main);
  font-family: monospace;
  font-size: 0.95rem;
  resize: vertical;
  outline: none;
  transition: var(--transition);
}

#message-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px var(--primary-glow);
}

.input-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* Animations */
@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.5; }
  100% { opacity: 1; }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}


/* Toast Notification */
#toast-container {
  position: fixed;
  bottom: 30px;
  right: 30px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.toast {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 20px;
  background: rgba(239, 68, 68, 0.9);
  backdrop-filter: blur(10px);
  color: white;
  border-radius: var(--radius-md);
  box-shadow: 0 10px 25px rgba(239, 68, 68, 0.3);
  font-weight: 500;
  font-size: 0.95rem;
  transform: translateX(120%);
  opacity: 0;
  transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.toast.show {
  transform: translateX(0);
  opacity: 1;
}
.toast i {
  font-size: 1.2rem;
}