:root {
  --bg-primary: #0f0f11;
  --bg-secondary: #1a1a2e;
  --bg-tertiary: #16213e;
  --bg-user-msg: #0B7EB5;
  --text-primary: #e4e4e7;
  --text-secondary: #a1a1aa;
  --text-muted: #6b7280;
  --accent: #0B7EB5;
  --accent-hover: #0d8ec9;
  --accent-glow: rgba(11, 126, 181, 0.3);
  --border: rgba(255, 255, 255, 0.06);
  --glass: rgba(26, 26, 46, 0.8);
  --glass-border: rgba(255, 255, 255, 0.08);
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --font-main: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --sidebar-width: 280px;
  --header-height: 56px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.5);
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  height: 100dvh;
  overflow: hidden;
}

::selection {
  background-color: var(--accent);
  color: white;
}

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  background-color: var(--bg-primary);
  z-index: 9999;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
}

.loading-logo {
  max-width: 200px;
  margin-bottom: 2rem;
  animation: pulse 2s infinite;
}

.spinner {
  border: 4px solid var(--border);
  border-top: 4px solid var(--accent);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.app-container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  height: 100dvh;
}

/* Sidebar */
.sidebar {
  background-color: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  height: 100%;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: var(--transition);
}

.sidebar-header {
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sidebar-logo {
  max-height: 32px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: white;
  border: none;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  margin: 0 1rem 1rem;
  font-family: var(--font-main);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: var(--transition);
  box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px var(--accent-glow);
}

.search-container {
  padding: 0 1rem 1rem;
}

.search-container input {
  width: 100%;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
}

.search-container input:focus {
  outline: none;
  border-color: var(--accent);
}

.chat-list-container {
  flex: 1;
  overflow-y: auto;
  padding: 0 1rem;
}

.chat-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.chat-item {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.chat-title {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}

.delete-chat-btn {
  background: transparent;
  border: none;
  font-size: 0.85rem;
  cursor: pointer;
  opacity: 0;
  padding: 0.15rem 0.3rem;
  border-radius: 4px;
  flex-shrink: 0;
  transition: var(--transition);
  color: var(--text-muted);
}

.chat-item:hover .delete-chat-btn {
  opacity: 1;
}

.delete-chat-btn:hover {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--danger);
}

.chat-item:hover {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.chat-item.active {
  background-color: rgba(11, 126, 181, 0.12);
  color: white;
  font-weight: 500;
  border-left: 2px solid var(--accent);
}

.chat-item.empty {
  pointer-events: none;
  opacity: 0.4;
  font-size: 0.85rem;
  text-align: center;
  padding: 1rem;
}

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

.user-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  overflow: hidden;
}

.avatar {
  width: 32px;
  height: 32px;
  background-color: var(--accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.name {
  font-size: 0.9rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.icon-btn:hover {
  color: var(--text-primary);
  background-color: rgba(255, 255, 255, 0.1);
}

/* Main Area */
.main-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  position: relative;
}

.chat-header {
  height: var(--header-height);
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background-color: rgba(15, 15, 17, 0.8);
  backdrop-filter: blur(10px);
  z-index: 10;
}

.model-selector select {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
  border: 1px solid var(--border);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
  cursor: pointer;
}

.status-badge {
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 600;
}

.status-badge.local {
  background-color: rgba(34, 197, 94, 0.1);
  color: var(--success);
}

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

.messages-container {
  flex: 1;
  overflow-y: auto;
  padding: 2rem 1rem;
  scroll-behavior: smooth;
}

.welcome-screen {
  max-width: 768px;
  margin: 4rem auto;
  text-align: center;
}

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

.welcome-screen h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
  font-family: 'Space Grotesk', sans-serif;
}

.welcome-screen p {
  color: var(--text-secondary);
  margin-bottom: 3rem;
  font-size: 1.1rem;
}

.suggested-prompts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1rem;
}

.prompt-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  cursor: pointer;
  text-align: left;
  font-family: var(--font-main);
  transition: var(--transition);
  font-size: 1rem;
}

.prompt-card:hover {
  background-color: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
  border-color: var(--accent);
}

#messages-list {
  max-width: 768px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-bottom: 2rem;
}

.message {
  display: flex;
  flex-direction: column;
  max-width: 100%;
  animation: fadeInUp 0.3s ease-out;
}

.message-user {
  align-self: flex-end;
  background-color: var(--bg-user-msg);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-xl);
  border-bottom-right-radius: 4px;
  max-width: 85%;
}

.message-assistant {
  align-self: flex-start;
  width: 100%;
}

.message-content {
  line-height: 1.6;
}

.message-content p {
  margin-bottom: 1rem;
}

.message-content p:last-child {
  margin-bottom: 0;
}

.message-content pre {
  background-color: #1e1e2e;
  padding: 1rem;
  border-radius: 0 0 var(--radius-md) var(--radius-md);
  overflow-x: auto;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  line-height: 1.5;
}

.code-block-wrapper {
  background-color: #1e1e2e;
  border-radius: var(--radius-md);
  margin: 1rem 0;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.06);
}

.code-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 0.75rem;
  background-color: rgba(255,255,255,0.04);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.code-lang {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.copy-code-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: var(--transition);
}

.copy-code-btn:hover {
  background-color: rgba(255,255,255,0.1);
  color: var(--text-primary);
}

.message-content code {
  font-family: var(--font-mono);
  background-color: rgba(255, 255, 255, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-size: 0.88em;
}

.message-content pre code {
  background-color: transparent;
  padding: 0;
}

.message-content h1,
.message-content h2,
.message-content h3 {
  margin: 1.2rem 0 0.5rem;
  font-family: 'Space Grotesk', sans-serif;
}

.message-content ul,
.message-content ol {
  padding-left: 1.5rem;
  margin: 0.5rem 0;
}

.message-content li {
  margin-bottom: 0.25rem;
}

.message-content a {
  color: var(--accent-hover);
  text-decoration: underline;
}

.message-content a:hover {
  color: white;
}

.message-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1rem 0;
}

.message-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
  opacity: 0.5;
  transition: var(--transition);
}

.message:hover .message-actions {
  opacity: 1;
}

.thinking-block {
  margin-bottom: 1rem;
}

.thinking-block summary {
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.9em;
  user-select: none;
}

.thinking-block .thinking-content {
  color: var(--text-muted);
  font-style: italic;
  padding-left: 1rem;
  border-left: 2px solid var(--accent);
  margin-top: 0.5rem;
  font-size: 0.9em;
}

.input-area {
  padding: 1rem;
  background: linear-gradient(to top, var(--bg-primary) 50%, transparent);
  max-width: 800px;
  width: 100%;
  margin: 0 auto;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 0.5rem;
  gap: 0.5rem;
  box-shadow: var(--shadow-lg);
}

.input-wrapper:focus-within {
  border-color: rgba(11, 126, 181, 0.5);
}

#chat-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 1rem;
  resize: none;
  padding: 0.5rem;
  max-height: 200px;
  min-height: 44px;
}

#chat-input:focus {
  outline: none;
}

.send-btn {
  background-color: var(--accent);
  color: white;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.send-btn:not(:disabled):hover {
  background-color: var(--accent-hover);
  transform: scale(1.05);
}

.send-btn:disabled {
  background-color: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 0.3);
  cursor: not-allowed;
}

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

.input-footer {
  text-align: right;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
  padding-right: 1rem;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(5px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}

.modal-content {
  background-color: var(--bg-secondary);
  padding: 2rem;
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  position: relative;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.close-modal {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: transparent;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
}

.settings-group {
  margin-bottom: 1.5rem;
}

.settings-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.settings-group input, .settings-group select {
  width: 100%;
  background-color: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.75rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-main);
}

.input-with-button {
  display: flex;
  gap: 0.5rem;
}

.input-with-button button {
  padding: 0 1rem;
  background-color: rgba(255, 255, 255, 0.1);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.password-input {
  position: relative;
}

.password-input .icon-btn {
  position: absolute;
  right: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
}

.settings-actions {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  margin-top: 2rem;
}

.btn-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  border: 1px solid rgba(239, 68, 68, 0.2);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
}

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

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.typing-indicator span {
  display: inline-block;
  width: 6px;
  height: 6px;
  background-color: var(--text-secondary);
  border-radius: 50%;
  margin: 0 2px;
  animation: typingDots 1.4s infinite ease-in-out both;
}

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

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

.cursor {
  display: inline-block;
  width: 8px;
  height: 1em;
  background-color: var(--text-primary);
  animation: blink 1s step-end infinite;
  vertical-align: middle;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.mobile-only {
  display: none;
}

@media (max-width: 768px) {
  .app-container {
    grid-template-columns: 1fr;
  }
  
  .sidebar {
    position: fixed;
    top: 0;
    left: -100%;
    width: 80%;
    max-width: 300px;
    z-index: 200;
    height: 100dvh;
    box-shadow: var(--shadow-lg);
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  
  .sidebar.open {
    left: 0;
  }

  /* Overlay when sidebar is open on mobile */
  .sidebar.open::before {
    content: '';
    position: fixed;
    inset: 0;
    left: 100%;
    background: rgba(0,0,0,0.5);
    z-index: -1;
  }
  
  .mobile-only {
    display: block;
  }

  .messages-container {
    padding: 1rem 0.5rem;
  }

  .input-area {
    padding: 0.75rem;
  }

  .welcome-screen {
    margin: 2rem auto;
    padding: 0 1rem;
  }

  .welcome-screen h1 {
    font-size: 1.8rem;
  }

  .suggested-prompts {
    grid-template-columns: 1fr;
  }
}