/* 
 * My Assistant Chatbot - Main Stylesheet
 * 반응형 채팅 UI 스타일
 */

/* CSS 변수 정의 */
:root {
  --primary-color: #4A90D9;
  --primary-dark: #3A7BC8;
  --user-message-bg: #4A90D9;
  --bot-message-bg: #E8E8E8;
  --background-color: #F5F5F5;
  --header-bg: #FFFFFF;
  --text-color: #333333;
  --text-light: #666666;
  --border-color: #E0E0E0;
  --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --max-width: 800px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

/* 기본 리셋 */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
}

/* 채팅 컨테이너 - 100vh 기반 단순 레이아웃 */
.chat-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* Safari 15.4+에서 동적 viewport 높이 */
  max-width: var(--max-width);
  margin: 0 auto;
  background-color: #FFFFFF;
  box-shadow: var(--shadow);
}

/* 헤더 영역 */
.chat-header {
  flex: 0 0 auto;
  padding: 16px 20px;
  background-color: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  text-align: center;
}

.chat-header h1 {
  font-size: clamp(1.1rem, 4vw, 1.5rem);
  font-weight: 600;
  color: var(--primary-color);
  margin-bottom: 4px;
  word-break: keep-all;
}

.chat-header .subtitle {
  font-size: clamp(0.75rem, 3vw, 0.875rem);
  color: var(--text-light);
  word-break: keep-all;
}

/* 채팅 메시지 영역 */
.chat-messages {
  flex: 1 1 auto;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background-color: var(--background-color);
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
}

/* 개별 메시지 스타일 */
.message {
  max-width: 85%;
  animation: fadeIn 0.3s ease-in;
  word-break: break-word;
}

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

/* 사용자 메시지 */
.user-message {
  align-self: flex-end;
}

.user-message .message-content {
  background-color: var(--user-message-bg);
  color: #FFFFFF;
  border-radius: var(--border-radius) var(--border-radius) 4px var(--border-radius);
  padding: 10px 14px;
  line-height: 1.6;
  word-wrap: break-word;
  font-size: clamp(0.875rem, 3.5vw, 1rem);
}

/* 봇 메시지 */
.bot-message {
  align-self: flex-start;
}

.bot-message .message-content {
  background-color: var(--bot-message-bg);
  color: var(--text-color);
  border-radius: var(--border-radius) var(--border-radius) var(--border-radius) 4px;
  padding: 10px 14px;
  line-height: 1.6;
  word-wrap: break-word;
  font-size: clamp(0.875rem, 3.5vw, 1rem);
  white-space: pre-wrap;
}

/* 봇 메시지 내 링크 스타일 */
.bot-message .message-content a {
  color: var(--primary-color);
  text-decoration: underline;
  word-break: break-all;
}

.bot-message .message-content a:hover {
  color: var(--primary-dark);
}

/* 로딩 상태 표시 */
.loading-indicator {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-light);
  padding: 8px 0;
}

.loading-dots {
  display: flex;
  gap: 4px;
}

.loading-dots span {
  width: 8px;
  height: 8px;
  background-color: var(--primary-color);
  border-radius: 50%;
  animation: bounce 1.4s infinite ease-in-out both;
}

.loading-dots span:nth-child(1) {
  animation-delay: -0.32s;
}

.loading-dots span:nth-child(2) {
  animation-delay: -0.16s;
}

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

/* 입력 영역 - 하단 고정 */
.chat-input-area {
  flex: 0 0 auto;
  padding: 12px 16px;
  padding-bottom: calc(12px + var(--safe-bottom));
  background-color: var(--header-bg);
  border-top: 1px solid var(--border-color);
}

.input-form {
  display: flex;
  gap: 8px;
  align-items: center;
}

.message-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  border: 2px solid var(--border-color);
  border-radius: 24px;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
  appearance: none;
}

.message-input:focus {
  border-color: var(--primary-color);
}

.message-input::placeholder {
  color: var(--text-light);
}

.send-button {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 10px 16px;
  background-color: var(--primary-color);
  color: #FFFFFF;
  border: none;
  border-radius: 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  -webkit-appearance: none;
  appearance: none;
}

.send-button:hover {
  background-color: var(--primary-dark);
}

.send-button:active {
  transform: scale(0.98);
}

.send-button:disabled {
  background-color: #CCCCCC;
  cursor: not-allowed;
}

.button-icon {
  font-size: 1rem;
}

.button-text {
  display: none;
}

/* 에러/시스템 메시지 스타일 */
.error-message .message-content,
.system-message .message-content {
  background-color: #FFF8E1;
  color: #795548;
  border: 1px solid #FFE082;
}

/* 데스크탑 스타일 */
@media (min-width: 601px) {
  .chat-header {
    padding: 20px;
  }

  .chat-messages {
    padding: 20px;
    gap: 16px;
  }

  .message {
    max-width: 75%;
  }

  .chat-input-area {
    padding: 16px 20px;
    padding-bottom: calc(16px + var(--safe-bottom));
  }

  .input-form {
    gap: 12px;
  }

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

  .send-button {
    padding: 12px 24px;
  }

  .button-text {
    display: inline;
  }
}

/* 스크롤바 스타일 (웹킷 브라우저) */
.chat-messages::-webkit-scrollbar {
  width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
  background: transparent;
}

.chat-messages::-webkit-scrollbar-thumb {
  background-color: #CCCCCC;
  border-radius: 3px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
  background-color: #AAAAAA;
}