* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f4f7fb;
  color: #111;
}

.chat-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.chat-card {
  width: 100%;
  max-width: 820px;
  background: #ffffff;
  border-radius: 22px;
  box-shadow: 0 12px 35px rgba(0,0,0,0.10);
  overflow: hidden;
  border-top: 6px solid #0A3161;
}

.chat-header {
  padding: 26px;
  background: #ffffff;
  border-bottom: 1px solid #e5eaf2;
}

.chat-header h1 {
  margin: 0 0 10px;
  font-size: 30px;
  color: #0A3161;
}

.chat-header p {
  margin: 0;
  line-height: 1.5;
  color: #333;
}

.chat-box {
  height: 430px;
  overflow-y: auto;
  padding: 22px;
  background: #f9fbff;
}

.message {
  max-width: 82%;
  padding: 14px 16px;
  margin-bottom: 14px;
  border-radius: 16px;
  line-height: 1.5;
  white-space: pre-wrap;
}

.message.user {
  margin-left: auto;
  background: #0A3161;
  color: #ffffff;
  border-bottom-right-radius: 4px;
}

.message.bot {
  margin-right: auto;
  background: #ffffff;
  border: 1px solid #dce4ef;
  color: #111;
  border-bottom-left-radius: 4px;
}

.chat-form {
  display: flex;
  gap: 12px;
  padding: 18px;
  border-top: 1px solid #e5eaf2;
  background: #ffffff;
}

.chat-form textarea {
  flex: 1;
  min-height: 56px;
  max-height: 120px;
  resize: vertical;
  padding: 14px;
  border: 1px solid #cfd8e6;
  border-radius: 14px;
  font-size: 16px;
}

.chat-form button {
  background: #0A3161;
  color: #ffffff;
  border: none;
  padding: 0 24px;
  border-radius: 14px;
  font-size: 16px;
  cursor: pointer;
}

.chat-form button:hover {
  opacity: 0.92;
}

@media (max-width: 700px) {
  .chat-page {
    padding: 12px;
    align-items: stretch;
  }

  .chat-card {
    border-radius: 16px;
  }

  .chat-header h1 {
    font-size: 24px;
  }

  .chat-box {
    height: 55vh;
  }

  .chat-form {
    flex-direction: column;
  }

  .chat-form button {
    padding: 14px;
  }

  .message {
    max-width: 94%;
  }
}