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

body {
  background: #f8f9fa;
  color: #202124;
  font-family: 'Google Sans', 'Roboto', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  overflow: hidden;
}

/* App Container */
.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  max-width: 100vw;
  background: #ffffff;
}

/* Header */
.header {
  background: #ffffff;
  border-bottom: 1px solid #e8eaed;
  padding: 12px 20px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
}

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

.header-title h1 {
  font-size: 22px;
  font-weight: 500;
  color: #202124;
  margin: 0;
}

.model-badge {
  background: #e8f0fe;
  color: #1967d2;
  padding: 4px 12px;
  border-radius: 16px;
  font-size: 13px;
  font-weight: 500;
}

.header-actions {
  display: flex;
  gap: 8px;
}

.icon-btn {
  background: transparent;
  border: none;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
  font-size: 20px;
  padding: 0;
}

.icon-btn:hover {
  background: #f1f3f4;
  opacity: 1;
}

.icon-btn:active {
  background: #e8eaed;
}

/* Settings Panel */
.settings-panel {
  background: #ffffff;
  border-bottom: 1px solid #e8eaed;
  max-height: 70vh;
  overflow-y: auto;
  animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
  from {
    max-height: 0;
    opacity: 0;
  }
  to {
    max-height: 70vh;
    opacity: 1;
  }
}

.settings-content {
  max-width: 800px;
  margin: 0 auto;
  padding: 24px 20px;
}

.settings-content h2 {
  font-size: 20px;
  font-weight: 500;
  color: #202124;
  margin-bottom: 20px;
}

/* Fields */
.field {
  margin-bottom: 24px;
}

label {
  display: block;
  font-size: 14px;
  color: #5f6368;
  margin-bottom: 8px;
  font-weight: 500;
  text-transform: none;
  letter-spacing: 0;
}

select,
input[type="text"] {
  width: 100%;
  background: #ffffff;
  color: #202124;
  border: 1px solid #dadce0;
  border-radius: 8px;
  padding: 12px 16px;
  font-size: 14px;
  outline: none;
  transition: all 0.2s;
  font-family: inherit;
}

select:hover,
input[type="text"]:hover {
  border-color: #bdc1c6;
}

select:focus,
input[type="text"]:focus {
  border-color: #1967d2;
  box-shadow: 0 0 0 3px rgba(25, 103, 210, 0.1);
}

/* Buttons */
button {
  background: #1967d2;
  color: #ffffff;
  border: none;
  border-radius: 24px;
  padding: 10px 24px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

button:hover {
  background: #1557b0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
  opacity: 1;
}

button:active {
  background: #1446a0;
}

button:disabled {
  background: #f1f3f4;
  color: #9aa0a6;
  cursor: not-allowed;
  box-shadow: none;
  opacity: 1;
}

/* Pull row */
.pull-row {
  display: flex;
  gap: 12px;
  margin-bottom: 12px;
}

.pull-row input {
  flex: 1;
}

.btn-pull {
  white-space: nowrap;
  padding: 10px 20px;
  font-size: 14px;
}

.status {
  font-size: 13px;
  color: #5f6368;
  margin-top: 8px;
  padding: 8px 12px;
  background: #f8f9fa;
  border-radius: 8px;
}

/* Model list */
.model-list {
  margin-top: 12px;
  max-height: 300px;
  overflow-y: auto;
}

.model-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: #f8f9fa;
  border: 1px solid #e8eaed;
  border-radius: 8px;
  margin-bottom: 8px;
  transition: all 0.2s;
}

.model-item:hover {
  background: #f1f3f4;
  border-color: #dadce0;
}

.model-info {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.model-name {
  font-size: 14px;
  font-weight: 500;
  color: #202124;
}

.model-size {
  font-size: 12px;
  color: #5f6368;
}

.btn-delete {
  background: transparent;
  color: #5f6368;
  padding: 8px;
  font-size: 18px;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-delete:hover {
  background: #fce8e6;
  color: #d93025;
  opacity: 1;
}

.empty {
  color: #5f6368;
  font-size: 14px;
  text-align: center;
  padding: 32px 20px;
}

/* Chat Container */
.chat-container {
  flex: 1;
  overflow-y: auto;
  background: #f8f9fa;
  padding: 20px;
}

/* Empty State */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
  color: #5f6368;
}

.empty-icon {
  font-size: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h2 {
  font-size: 24px;
  font-weight: 400;
  color: #202124;
  margin-bottom: 8px;
}

.empty-state p {
  font-size: 14px;
  color: #5f6368;
}

/* Messages */
.messages {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.message {
  display: flex;
  gap: 12px;
  animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
  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-size: 20px;
  flex-shrink: 0;
  background: #e8eaed;
}

.message-user .message-avatar {
  background: #e8f0fe;
}

.message-assistant .message-avatar {
  background: #e8eaed;
}

.message-content {
  flex: 1;
  min-width: 0;
}

.message-text {
  background: #ffffff;
  padding: 12px 16px;
  border-radius: 8px;
  font-size: 14px;
  line-height: 1.6;
  color: #202124;
  white-space: pre-wrap;
  word-wrap: break-word;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  border: 1px solid #e8eaed;
}

.message-user .message-text {
  background: #e8f0fe;
  border-color: #d2e3fc;
}

.message-meta {
  font-size: 12px;
  color: #5f6368;
  margin-top: 6px;
  padding: 0 4px;
}

.message-model {
  color: #1967d2;
}

/* Typing Indicator */
.typing-indicator {
  display: flex;
  gap: 6px;
  padding: 12px 16px;
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #5f6368;
  animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
  animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
  animation-delay: 0.4s;
}

@keyframes typing {
  0%, 60%, 100% {
    opacity: 0.3;
    transform: translateY(0);
  }
  30% {
    opacity: 1;
    transform: translateY(-8px);
  }
}

/* Input Container */
.input-container {
  background: #ffffff;
  border-top: 1px solid #e8eaed;
  padding: 16px 20px;
  box-shadow: 0 -1px 2px rgba(0, 0, 0, 0.05);
}

.input-wrapper {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  gap: 12px;
  align-items: flex-end;
}

.chat-input {
  flex: 1;
  background: #f8f9fa;
  color: #202124;
  border: 1px solid #e8eaed;
  border-radius: 24px;
  padding: 12px 20px;
  font-size: 14px;
  outline: none;
  resize: none;
  max-height: 150px;
  font-family: inherit;
  line-height: 1.5;
  transition: all 0.2s;
}

.chat-input:hover {
  border-color: #dadce0;
}

.chat-input:focus {
  background: #ffffff;
  border-color: #1967d2;
  box-shadow: 0 0 0 3px rgba(25, 103, 210, 0.1);
}

.chat-input:disabled {
  background: #f1f3f4;
  color: #9aa0a6;
  cursor: not-allowed;
}

.send-btn {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
  background: #1967d2;
  color: #ffffff;
}

.send-btn:hover {
  background: #1557b0;
}

.send-btn:disabled {
  background: #f1f3f4;
  color: #9aa0a6;
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .header {
    padding: 12px 16px;
  }

  .header-title h1 {
    font-size: 18px;
  }

  .model-badge {
    font-size: 11px;
    padding: 3px 8px;
  }

  .settings-content {
    padding: 20px 16px;
  }

  .chat-container {
    padding: 16px;
  }

  .messages {
    gap: 12px;
  }

  .message-avatar {
    width: 32px;
    height: 32px;
    font-size: 16px;
  }

  .message-text {
    font-size: 14px;
    padding: 10px 14px;
  }

  .input-container {
    padding: 12px 16px;
  }

  .chat-input {
    padding: 10px 16px;
    font-size: 16px; /* Prevents zoom on iOS */
  }

  .send-btn {
    width: 44px;
    height: 44px;
  }

  .empty-icon {
    font-size: 48px;
  }

  .empty-state h2 {
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  .header-title {
    gap: 8px;
  }

  .header-title h1 {
    font-size: 16px;
  }

  .model-badge {
    display: none;
  }

  .icon-btn {
    width: 36px;
    height: 36px;
    font-size: 18px;
  }

  .settings-content h2 {
    font-size: 18px;
  }

  .field {
    margin-bottom: 20px;
  }

  .pull-row {
    flex-direction: column;
    gap: 8px;
  }

  .btn-pull {
    width: 100%;
  }
}