body {
  font-family: 'Noto Serif SC', serif;
  background: linear-gradient(135deg, #001a2e 0%, #003366 100%);
  margin: 0;
  padding: 0;
  color: #ffffff;
  line-height: 1.6;
}

header {
  background: linear-gradient(90deg, #1a2a44 0%, #2e4372 100%);
  color: #f5f5f5;
  padding: 2rem;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

header h1 {
  margin: 0;
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

main {
  max-width: 1200px;
  margin: 1rem auto;
}

section {
  margin: 1.5rem 0;
  padding: 2.5rem;
  background: rgba(38, 133, 83, 0.95);
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  min-height: 350px;
}

section:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

section h2 {
  color: #1a2a44;
  font-size: 1.8rem;
  margin-bottom: 1rem;
  border-bottom: 2px solid #d4a017;
  padding-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

section h2::before {
  content: attr(data-icon);
  margin-right: 0.5rem;
  font-size: 1.5rem;
}

#upload-section h2::before { content: "📄"; color: #1a2a44; }
#preview-section h2::before { content: "📝"; color: #4a6a9b; }
#risk-section h2::before { content: "⚠️"; color: #d4a017; }
#chat-section h2::before { content: "💬"; color: #2e4372; }

#drag-drop-zone {
  border: 3px dashed #4a6a9b;
  padding: 2rem;
  text-align: center;
  color: #4a6a9b;
  border-radius: 10px;
  background: rgba(245, 245, 245, 0.9);
  transition: border-color 0.3s ease;
}

#drag-drop-zone:hover {
  border-color: #d4a017;
}

#drag-drop-zone input[type="file"] {
  display: block;
  margin: 1rem auto;
  padding: 0.5rem;
  background: #1a2a44;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#contract-text {
  white-space: pre-wrap;
  background: #f8f9fa;
  padding: 1.5rem;
  border-radius: 8px;
  max-height: 200px;
  overflow-y: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: #333;
  border: 1px solid #e0e0e0;
  transition: max-height 0.3s ease;
}

#toggle-preview {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  background: #1a2a44;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#toggle-preview:hover {
  background: #2e4372;
}

.risk-default, .risk-box, .no-risk {
  background: #fff8e1;
  color: #856404;
  border-left: 6px solid #d4a017;
  padding: 1rem;
  border-radius: 6px;
  margin: 1rem 0;
}

.risk-box ul {
  list-style: none;
  padding: 0;
}

.risk-box li {
  margin-bottom: 0.5rem;
  padding-left: 1.5rem;
  position: relative;
}

.risk-box li::before {
  content: "⚠️";
  position: absolute;
  left: 0;
}

#chat-log {
  height: 250px;
  overflow-y: auto;
  background: #EAE5DA;
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid #e0e0e0;
  margin-bottom: 1rem;
  color: #333;
}

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

#chat-input {
  flex-grow: 1;
  padding: 0.75rem;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

#chat-input:focus {
  border-color: #d4a017;
  outline: none;
}

#send-chat {
  padding: 0.75rem 1.5rem;
  background: linear-gradient(90deg, #1a2a44 0%, #2e4372 100%);
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-weight: 600;
  transition: background 0.3s ease;
}

#send-chat:hover {
  background: linear-gradient(90deg, #2e4372 0%, #4a6a9b 100%);
}

.hint {
  font-size: 0.9rem;
  color: #666;
  margin-top: 1rem;
}

footer {
  text-align: center;
  padding: 2rem;
  color: #b0b0b0;
  font-size: 0.9rem;
  background: #1a2a44;
  border-top: 1px solid #4a6a9b;
}

#status-section {
  background: rgba(195, 224, 64, 0);
  color: #ffffff;
}

#status-area {
  font-size: 1.2rem;
  font-weight: 500;
  text-align: center;
  height: 80px;
  font-size: 19px;
}

#status-section .hint {
  color: #51a5a5;
  text-align: center;
  font-size: 17px;
}

/* 平板端适配 */
@media (max-width: 1024px) {
  main {
    max-width: 90%;
  }
  section {
    padding: 1.5rem;
  }
}

/* 手机端适配 */
@media (max-width: 768px) {
  main {
    max-width: 100%;
    padding: 0 1rem;
  }
  section {
    padding: 1rem;
    min-height: auto;
  }
  #contract-text, #chat-log {
    height: auto;
    max-height: 300px;
  }
  .chat-controls {
    flex-direction: column;
  }
  #chat-input, #send-chat {
    width: 100%;
  }
  #send-chat {
    margin-top: 0.5rem;
  }
}

/* ... 原有样式保持不动 ... */

/* ✅ 新增：chat-log 展开按钮 */
#toggle-chat-log {
  margin-top: 0.5rem;
  padding: 0.5rem 1rem;
  background: #1a2a44;
  color: #ffffff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#toggle-chat-log:hover {
  background: #2e4372;
}

/* ✅ 新增：AI回答格式化 */
.ai-response p {
  margin: 0.5rem 0;
  line-height: 1.6;
  text-indent: 2em;
}