* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #1f1f1f;
}

.container {
  max-width: 1200px;
  margin: 32px auto;
  padding: 28px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

h1 {
  margin-top: 0;
}

.hint {
  margin-bottom: 20px;
  color: #666666;
}

.header {
  margin-bottom: 24px;
}

.layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 20px;
  min-width: 0;
}

.sidebar {
  border-right: 1px solid #eeeeee;
  padding-right: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.field {
  display: block;
  margin-bottom: 16px;
  font-weight: 600;
}

textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px;
  font-size: 14px;
  border: 1px solid #cccccc;
  border-radius: 8px;
  resize: vertical;
}

button {
  padding: 10px 18px;
  border: none;
  border-radius: 8px;
  background: #2b6ef2;
  color: #ffffff;
  font-size: 14px;
  cursor: pointer;
  width: 100%;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.result {
  margin-top: 24px;
}

.chat {
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-width: 0;
}

.history {
  min-height: 320px;
  max-height: 520px;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 12px;
  background: #f7f7f7;
  border-radius: 12px;
}

.bubble {
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 8px;
  line-height: 1.4;
  max-width: 100%;
  overflow-wrap: anywhere;
}

.bubble.user {
  background: #e9f1ff;
}

.bubble.assistant {
  background: #ffffff;
  border: 1px solid #e6e6e6;
}

.bubble.typing {
  display: flex;
  align-items: center;
  gap: 8px;
}

.typing-indicator {
  display: inline-flex;
  gap: 6px;
  align-items: center;
}

.typing-indicator span {
  width: 6px;
  height: 6px;
  background: #6b6b6b;
  border-radius: 50%;
  display: inline-block;
  animation: typingPulse 1.2s infinite;
}

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

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

.markdown pre code.hljs {
  background: transparent;
  padding: 0;
}

@keyframes typingPulse {
  0%,
  80%,
  100% {
    opacity: 0.3;
    transform: scale(0.9);
  }
  40% {
    opacity: 1;
    transform: scale(1);
  }
}

.markdown {
  margin-top: 6px;
}

.markdown p {
  margin: 0 0 8px;
}

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

.markdown ul,
.markdown ol {
  margin: 0 0 8px 18px;
  padding: 0;
}

.markdown code {
  background: #f0f0f0;
  padding: 2px 4px;
  border-radius: 4px;
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.9em;
}

.markdown pre {
  background: #1f1f1f;
  color: #f4f4f4;
  padding: 12px;
  border-radius: 8px;
  overflow-x: auto;
  max-width: 100%;
}

.markdown pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.markdown blockquote {
  margin: 0 0 8px;
  padding-left: 12px;
  border-left: 3px solid #d0d0d0;
  color: #555555;
}

.role {
  display: inline-block;
  margin-right: 6px;
  font-weight: 700;
}

.message-meta {
  margin-top: 6px;
  font-size: 12px;
  color: #6a6a6a;
}

#chat-list {
  list-style: none;
  padding: 0;
  margin: 16px 0 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

#chat-list li {
  padding: 8px 10px;
  border-radius: 8px;
  background: #f3f3f3;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

#chat-list li.active {
  background: #2b6ef2;
  color: #ffffff;
}

.empty {
  color: #777777;
  font-size: 14px;
}

.seo {
  max-width: 1200px;
  margin: 0 auto 48px;
  padding: 24px 28px 32px;
  background: #ffffff;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.06);
}

.seo h2 {
  margin: 0 0 12px;
  font-size: 22px;
}

.seo p {
  margin: 0 0 12px;
  line-height: 1.6;
  color: #4a4a4a;
}

.seo ul {
  margin: 16px 0 0 18px;
  color: #4a4a4a;
}

.seo li {
  margin-bottom: 6px;
}

@media (max-width: 900px) {
  .container {
    margin: 16px;
    padding: 20px;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    padding-right: 0;
    border-bottom: 1px solid #eeeeee;
    padding-bottom: 16px;
  }

  .seo {
    margin: 0 16px 32px;
    padding: 20px;
  }
}

@media (max-width: 600px) {
  .container {
    margin: 12px;
    padding: 16px;
  }

  .history {
    min-height: 240px;
    max-height: 360px;
  }

  .seo {
    margin: 0 12px 24px;
    padding: 16px;
  }

  .seo h2 {
    font-size: 20px;
  }
}