:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-tertiary: #1a1a26;
  --text-primary: #e8e8f0;
  --text-secondary: #a0a0b8;
  --text-muted: #70707f;
  --accent: #6366f1;
  --accent-hover: #7c7ff5;
  --accent-light: rgba(99, 102, 241, 0.1);
  --border: rgba(255, 255, 255, 0.1);
  --glass-bg: rgba(26, 26, 38, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --success: #10b981;
  --error: #ef4444;
  --warning: #f59e0b;
  
  /* Glassmorphism */
  --blur: 20px;
  --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
}

.light-theme {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f9fafb;
  --text-primary: #1a1a26;
  --text-secondary: #4b5563;
  --text-muted: #9ca3af;
  --accent: #6366f1;
  --accent-hover: #7c7ff5;
  --accent-light: rgba(99, 102, 241, 0.08);
  --border: rgba(0, 0, 0, 0.08);
  --glass-bg: rgba(255, 255, 255, 0.7);
  --glass-border: rgba(0, 0, 0, 0.08);
  --shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.12);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  overflow: hidden;
  transition: all 0.3s ease;
}

/* Glassmorphism Effect */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur));
  -webkit-backdrop-filter: blur(var(--blur));
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow);
}

/* Gradient Text */
.gradient-text {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 700;
}

/* Splash Screen */
.splash-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
  z-index: 9999;
  animation: fadeOut 0.5s ease 2s forwards;
}

@keyframes fadeOut {
  to { opacity: 0; pointer-events: none; }
}

.splash-content {
  text-align: center;
}

.splash-logo {
  margin-bottom: 2rem;
}

.logo-circle {
  width: 80px;
  height: 80px;
  margin: 0 auto 1rem;
  border-radius: 50%;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.logo-text {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: 0.5rem;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.splash-tagline {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.loading-dots {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

.loading-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
  0%, 80%, 100% { transform: scale(0); }
  40% { transform: scale(1); }
}

/* Auth Screen */
.auth-screen {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
}

.auth-container {
  width: 90%;
  max-width: 420px;
  padding: 2.5rem;
  border-radius: 24px;
  animation: slideIn 0.4s ease;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.auth-header {
  text-align: center;
  margin-bottom: 2rem;
}

.auth-header h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.auth-header p {
  color: var(--text-secondary);
}

.auth-tabs {
  display: flex;
  gap: 1rem;
  margin-bottom: 2rem;
}

.auth-tab {
  flex: 1;
  padding: 0.75rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  border-radius: 12px;
  transition: all 0.3s ease;
}

.auth-tab.active {
  background: var(--accent);
  color: white;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-group label {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  padding: 0.875rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.form-error {
  color: var(--error);
  font-size: 0.875rem;
  min-height: 20px;
  text-align: center;
}

.btn-primary {
  padding: 1rem;
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  border: none;
  border-radius: 12px;
  color: white;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
  padding: 0.75rem 1.5rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-secondary:hover {
  background: var(--bg-secondary);
  border-color: var(--accent);
}

/* Main App Layout */
.main-app {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 300px;
  display: flex;
  flex-direction: column;
  border-radius: 0 24px 24px 0;
  margin: 1rem 0 1rem 1rem;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.sidebar-header h2 {
  font-size: 1.5rem;
}

.chat-list {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
}

.chat-item {
  padding: 1rem;
  margin-bottom: 0.5rem;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.3s ease;
  border: 1px solid transparent;
}

.chat-item:hover {
  background: var(--bg-tertiary);
}

.chat-item.active {
  background: var(--accent-light);
  border-color: var(--accent);
}

.chat-item-title {
  font-weight: 500;
  margin-bottom: 0.25rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.chat-item-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.sidebar-footer {
  display: flex;
  gap: 0.5rem;
  padding: 1rem;
  border-top: 1px solid var(--border);
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin: 1rem;
}

.chat-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  border-radius: 24px;
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.chat-title-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-size: 1.25rem;
  font-weight: 600;
  outline: none;
}

.chat-actions {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.private-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.welcome-message {
  text-align: center;
  padding: 4rem 2rem;
}

.welcome-icon {
  font-size: 4rem;
  margin-bottom: 1rem;
}

.welcome-message h2 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.welcome-message p {
  color: var(--text-secondary);
}

.message {
  display: flex;
  gap: 1rem;
  animation: messageSlide 0.3s ease;
}

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

.message-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  flex-shrink: 0;
}

.message.user .message-avatar {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  color: white;
}

.message.assistant .message-avatar {
  background: var(--bg-tertiary);
  border: 2px solid var(--accent);
}

.message-content {
  flex: 1;
  padding: 1rem 1.25rem;
  border-radius: 16px;
  line-height: 1.6;
}

.message.user .message-content {
  background: var(--accent);
  color: white;
  margin-left: auto;
  max-width: 70%;
}

.message.assistant .message-content {
  background: var(--bg-tertiary);
}

.message-thinking {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
}

.message-thinking span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: bounce 1.4s infinite ease-in-out both;
}

.input-area {
  display: flex;
  align-items: flex-end;
  gap: 0.75rem;
  padding: 1.5rem;
  border-top: 1px solid var(--border);
}

#message-input {
  flex: 1;
  padding: 0.875rem 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 16px;
  color: var(--text-primary);
  font-size: 1rem;
  font-family: inherit;
  outline: none;
  resize: none;
  max-height: 150px;
  transition: all 0.3s ease;
}

#message-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}

.icon-btn {
  width: 42px;
  height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.3s ease;
}

.icon-btn:hover {
  background: var(--accent-light);
  border-color: var(--accent);
  color: var(--accent);
}

.icon-btn.primary {
  background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
  border: none;
  color: white;
}

.icon-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

.icon-btn.danger:hover {
  background: var(--error);
  border-color: var(--error);
  color: white;
}

/* Modal */
.modal {
  position: fixed;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  z-index: 1000;
}

.modal-content {
  width: 90%;
  max-width: 600px;
  max-height: 80vh;
  border-radius: 24px;
  overflow: hidden;
  animation: slideIn 0.3s ease;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-close {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 8px;
  transition: all 0.3s ease;
}

.modal-close:hover {
  background: var(--error);
  color: white;
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
  max-height: calc(80vh - 80px);
}

.settings-section {
  margin-bottom: 2rem;
}

.settings-section h4 {
  margin-bottom: 1rem;
  color: var(--accent);
}

.setting-description {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

.memory-list {
  margin-top: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.memory-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 12px;
}

.memory-item-text {
  flex: 1;
  font-size: 0.9rem;
}

.memory-item button {
  margin-left: 1rem;
}

/* Utilities */
.hidden {
  display: none !important;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: -300px;
    transition: left 0.3s ease;
    z-index: 100;
  }
  
  .sidebar.open {
    left: 0;
  }
  
  .message.user .message-content {
    max-width: 85%;
  }
}