/* ==========================================================
   압연롤 설계 AI 상담 챗봇 — Gemini 스타일 시트
   ========================================================== */

/* ----------------------------------------------------------
   1. CSS 변수 (Gemini Design Tokens)
   ---------------------------------------------------------- */
:root {
  /* Gemini 컬러 팔레트 (라이트 모드) */
  --color-primary: #1a73e8;
  --color-primary-hover: #1557b0;
  --color-primary-container: #d3e3fd;
  --color-on-primary-container: #041e49;

  /* 배경 */
  --bg-app: #ffffff;
  --bg-sidebar: #f0f4f9;
  --bg-sidebar-hover: #e4e9f0;
  --bg-sidebar-active: #d3e3fd;
  --bg-chat: #ffffff;
  --bg-header: #ffffff;
  --bg-input-wrapper: #f0f4f9;
  --bg-user-message: #e8f0fe;
  --bg-modal: rgba(0, 0, 0, 0.54);
  --bg-modal-box: #ffffff;
  --bg-params: #f8f9fa;
  --bg-chip: #f0f4f9;
  --bg-chip-hover: #e4e9f0;
  --bg-code: #f1f3f4;

  /* 텍스트 */
  --text-primary: #1f1f1f;
  --text-secondary: #444746;
  --text-muted: #747775;
  --text-inverse: #ffffff;
  --text-sidebar: #1f1f1f;
  --text-sidebar-muted: #444746;
  --text-user: #1f1f1f;
  --text-link: #1a73e8;

  /* 경계선 */
  --border-color: #e0e3e7;
  --border-input: #c4c7c5;
  --border-radius-sm: 8px;
  --border-radius: 16px;
  --border-radius-lg: 24px;
  --border-radius-pill: 9999px;

  /* 그림자 */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.12);
  --shadow-input: 0 1px 6px rgba(0, 0, 0, 0.1);
  --shadow-modal: 0 8px 32px rgba(0, 0, 0, 0.16);

  /* 간격 */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 40px;

  /* 레이아웃 */
  --sidebar-width: 256px;
  --params-panel-width: 320px;
  --header-height: 64px;
  --chat-max-width: 820px;

  /* 타이포그래피 */
  --font-family: 'Google Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    'Noto Sans KR', sans-serif;
  --font-size-xs: 11px;
  --font-size-sm: 13px;
  --font-size-base: 14px;
  --font-size-md: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 40px;
  --line-height-base: 1.7;

  /* 전환 */
  --transition: 200ms cubic-bezier(0.2, 0, 0, 1);
  --transition-slow: 300ms cubic-bezier(0.2, 0, 0, 1);

  /* Gemini 그라디언트 */
  --gemini-gradient: linear-gradient(135deg, #4285f4 0%, #9b72cb 30%, #d96570 60%, #f29900 100%);
}

/* 다크 모드 */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #8ab4f8;
    --color-primary-hover: #adc8ff;
    --color-primary-container: #0842a0;
    --color-on-primary-container: #d3e3fd;

    --bg-app: #1e1f20;
    --bg-sidebar: #282a2c;
    --bg-sidebar-hover: #35373b;
    --bg-sidebar-active: #0842a0;
    --bg-chat: #1e1f20;
    --bg-header: #1e1f20;
    --bg-input-wrapper: #2e3033;
    --bg-user-message: #394457;
    --bg-modal: rgba(0, 0, 0, 0.7);
    --bg-modal-box: #2e3033;
    --bg-params: #2e3033;
    --bg-chip: #35373b;
    --bg-chip-hover: #3f4145;
    --bg-code: #35373b;

    --text-primary: #e3e3e3;
    --text-secondary: #c4c7c5;
    --text-muted: #8e918f;
    --text-sidebar: #e3e3e3;
    --text-sidebar-muted: #c4c7c5;
    --text-user: #e3e3e3;
    --text-link: #8ab4f8;

    --border-color: #3f4145;
    --border-input: #5e6368;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-input: 0 1px 6px rgba(0, 0, 0, 0.4);
    --shadow-modal: 0 8px 32px rgba(0, 0, 0, 0.5);
  }
}

/* ----------------------------------------------------------
   2. 리셋 & 기본
   ---------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base);
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: var(--line-height-base);
  min-height: 100vh;
  overflow: hidden;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--border-radius-sm);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ----------------------------------------------------------
   3. 버튼 공통
   ---------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1;
  border: none;
  border-radius: var(--border-radius-pill);
  cursor: pointer;
  transition: background-color var(--transition), color var(--transition),
    box-shadow var(--transition);
  text-decoration: none;
  white-space: nowrap;
  -webkit-tap-highlight-color: transparent;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
}

.btn-outline {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-pill);
  padding: 7px 16px;
  font-size: var(--font-size-sm);
}

.btn-outline:hover:not(:disabled) {
  background-color: var(--bg-sidebar-hover);
}

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  background-color: transparent;
  color: var(--text-secondary);
  border-radius: 50%;
  flex-shrink: 0;
  font-size: 20px;
  line-height: 1;
}

.btn-icon:hover:not(:disabled) {
  background-color: var(--bg-sidebar-hover);
  color: var(--text-primary);
}

.btn-full {
  width: 100%;
}

/* 새 채팅 버튼 (Gemini 스타일) */
.btn-new-chat {
  display: flex;
  align-items: center;
  gap: 10px;
  width: calc(100% - 20px);
  margin: 10px;
  padding: 10px 14px;
  background-color: transparent;
  color: var(--text-sidebar);
  border-radius: var(--border-radius-pill);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: background-color var(--transition);
}

.btn-new-chat:hover:not(:disabled) {
  background-color: var(--bg-sidebar-hover);
}

.btn-new-chat svg {
  flex-shrink: 0;
}

/* 전송 버튼 (Gemini 스타일) */
.btn-send {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-primary);
  color: #fff;
  flex-shrink: 0;
  transition: background-color var(--transition), transform var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-send:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  transform: scale(1.05);
}

.btn-send:disabled {
  background-color: var(--border-color);
  color: var(--text-muted);
}

.btn-send svg {
  width: 20px;
  height: 20px;
}

/* ----------------------------------------------------------
   4. 앱 레이아웃
   ---------------------------------------------------------- */
.app-layout {
  display: flex;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

/* ----------------------------------------------------------
   5. 사이드바 (Gemini 스타일)
   ---------------------------------------------------------- */
.sidebar {
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  overflow: hidden;
  transition: transform var(--transition-slow), width var(--transition-slow);
  z-index: 200;
  border-right: 1px solid var(--border-color);
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 18px 14px 12px;
  flex-shrink: 0;
}

/* Gemini 스타 아이콘 (사이드바 로고) */
.sidebar-logo-icon {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-sidebar);
  flex: 1;
  letter-spacing: -0.3px;
}

.sidebar-close-btn {
  display: none;
  color: var(--text-sidebar-muted);
  width: 36px;
  height: 36px;
}

/* 새 채팅 버튼 영역 */
.sidebar-new-chat-area {
  padding: 4px 10px 8px;
  flex-shrink: 0;
}

.sidebar-section-title {
  padding: 12px 16px 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-sidebar-muted);
  flex-shrink: 0;
}

.session-list {
  list-style: none;
  padding: 0 6px;
  flex: 1;
  overflow-y: auto;
}

.session-list::-webkit-scrollbar {
  width: 4px;
}

.session-list::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--border-radius-pill);
}

.session-list-empty {
  padding: var(--spacing-md) var(--spacing-sm);
  font-size: var(--font-size-sm);
  color: var(--text-sidebar-muted);
  text-align: center;
}

.session-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 8px 10px;
  border-radius: var(--border-radius-pill);
  cursor: pointer;
  color: var(--text-sidebar);
  font-size: var(--font-size-sm);
  transition: background-color var(--transition);
  background-color: transparent;
  border: none;
  width: 100%;
  text-align: left;
}

.session-item:hover {
  background-color: var(--bg-sidebar-hover);
}

.session-item--active {
  background-color: var(--bg-sidebar-active);
  color: var(--color-on-primary-container);
}

.session-item-icon {
  font-size: 16px;
  flex-shrink: 0;
  color: var(--text-sidebar-muted);
  width: 18px;
  text-align: center;
}

.session-item-info {
  overflow: hidden;
  flex: 1;
  min-width: 0;
}

.session-item-title {
  display: block;
  font-weight: 400;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: inherit;
  font-size: var(--font-size-sm);
}

.session-item-date {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-sidebar-muted);
  margin-top: 1px;
}

/* 오버레이 */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 190;
}

/* ----------------------------------------------------------
   6. 채팅 메인
   ---------------------------------------------------------- */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background-color: var(--bg-chat);
  min-width: 0;
}

/* ----------------------------------------------------------
   7. 헤더 (Gemini 미니멀)
   ---------------------------------------------------------- */
.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  padding: 0 var(--spacing-md);
  background-color: var(--bg-header);
  flex-shrink: 0;
  gap: var(--spacing-sm);
}

.header-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  min-width: 0;
}

.menu-toggle-btn {
  display: none;
}

/* 모델명 칩 (Gemini 스타일) */
.header-model-chip {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px 6px 10px;
  border-radius: var(--border-radius-pill);
  cursor: pointer;
  font-size: var(--font-size-md);
  font-weight: 500;
  color: var(--text-primary);
  background: transparent;
  border: none;
  transition: background-color var(--transition);
  white-space: nowrap;
}

.header-model-chip:hover {
  background-color: var(--bg-sidebar-hover);
}

.header-model-chip svg {
  width: 20px;
  height: 20px;
}

.header-model-name {
  font-size: var(--font-size-md);
  font-weight: 600;
  letter-spacing: -0.2px;
}

.header-model-chevron {
  color: var(--text-muted);
  font-size: 14px;
}

.header-right {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  flex-shrink: 0;
}

.user-info {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 140px;
}

/* ----------------------------------------------------------
   8. 채팅 콘텐츠 래퍼
   ---------------------------------------------------------- */
.chat-content-wrapper {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.chat-messages-section {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* ----------------------------------------------------------
   9. 채팅 메시지 영역
   ---------------------------------------------------------- */
.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-lg) var(--spacing-md);
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
  width: 6px;
}

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

.chat-messages::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--border-radius-pill);
}

/* 메시지 컨테이너 최대 너비 제한 */
.messages-inner {
  max-width: var(--chat-max-width);
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* ----------------------------------------------------------
   10. 환영 화면 (Gemini 스타일)
   ---------------------------------------------------------- */
.welcome-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: var(--spacing-xl) var(--spacing-md);
  min-height: 400px;
  text-align: center;
}

.welcome-icon {
  width: 72px;
  height: 72px;
  margin-bottom: var(--spacing-lg);
}

.welcome-greeting {
  font-size: var(--font-size-3xl);
  font-weight: 600;
  letter-spacing: -1px;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  background: var(--gemini-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.welcome-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

/* 제안 칩 그리드 */
.welcome-chips {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--spacing-sm);
  max-width: 600px;
  width: 100%;
}

.welcome-chip {
  padding: var(--spacing-md);
  background-color: var(--bg-chip);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  cursor: pointer;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  text-align: left;
  line-height: 1.5;
  transition: background-color var(--transition), border-color var(--transition);
  font-family: inherit;
}

.welcome-chip:hover {
  background-color: var(--bg-chip-hover);
  border-color: var(--color-primary);
  color: var(--text-primary);
}

/* ----------------------------------------------------------
   11. 메시지 (Gemini 스타일)
   ---------------------------------------------------------- */
.message {
  display: flex;
  gap: 12px;
  max-width: 100%;
  animation: messageAppear 0.2s ease;
}

@keyframes messageAppear {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* 사용자 메시지: 오른쪽 정렬 */
.message--user {
  flex-direction: row-reverse;
  justify-content: flex-start;
}

/* AI 아바타 (Gemini 스타 아이콘) */
.message-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0;          /* 텍스트 숨김 */
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 4px;

  /* 사용자 기본 */
  background-color: var(--color-primary);
  color: #fff;
}

/* 사용자 아바타 텍스트 복원 */
.message--user .message-avatar {
  font-size: var(--font-size-xs);
  background: linear-gradient(135deg, #4285f4, #0f9d58);
}

/* AI 아바타: Gemini 스타 CSS */
.message--assistant .message-avatar {
  background: transparent;
  font-size: 0;
  overflow: visible;
}

.message--assistant .message-avatar::after {
  content: '';
  display: block;
  width: 28px;
  height: 28px;
  background: var(--gemini-gradient);
  clip-path: polygon(
    50% 0%, 60% 40%, 100% 50%,
    60% 60%, 50% 100%, 40% 60%,
    0% 50%, 40% 40%
  );
}

.message-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
  max-width: min(76%, 680px);
  min-width: 0;
}

.message--user .message-body {
  align-items: flex-end;
}

/* 메시지 버블 */
.message-bubble {
  word-break: break-word;
  overflow-wrap: anywhere;
  font-size: var(--font-size-md);
  line-height: var(--line-height-base);
}

/* 사용자: 라운드 필 배경 */
.message--user .message-bubble {
  background-color: var(--bg-user-message);
  color: var(--text-user);
  padding: 10px var(--spacing-md);
  border-radius: var(--border-radius-lg) var(--border-radius-lg)
    var(--border-radius-sm) var(--border-radius-lg);
}

/* AI: 배경 없음, 텍스트만 */
.message--assistant .message-bubble {
  background: transparent;
  color: var(--text-primary);
  padding: 4px 0;
}

/* 스트리밍 커서 */
.message-bubble--streaming::after {
  content: '';
  display: inline-block;
  width: 2px;
  height: 1.1em;
  background-color: var(--color-primary);
  margin-left: 3px;
  vertical-align: text-bottom;
  animation: typingCursor 0.8s ease-in-out infinite;
}

@keyframes typingCursor {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0; }
}

.message-time {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  opacity: 0;
  transition: opacity var(--transition);
}

.message:hover .message-time {
  opacity: 1;
}

/* 마크다운 */
.message-bubble p { margin-bottom: 10px; }
.message-bubble p:last-child { margin-bottom: 0; }
.message-bubble h1,
.message-bubble h2,
.message-bubble h3 {
  font-weight: 600;
  margin-bottom: 10px;
  margin-top: var(--spacing-md);
  letter-spacing: -0.3px;
}
.message-bubble h1:first-child,
.message-bubble h2:first-child,
.message-bubble h3:first-child { margin-top: 0; }
.message-bubble h1 { font-size: var(--font-size-xl); }
.message-bubble h2 { font-size: var(--font-size-lg); }
.message-bubble h3 { font-size: var(--font-size-md); }
.message-bubble ul,
.message-bubble ol {
  padding-left: var(--spacing-lg);
  margin-bottom: 10px;
}
.message-bubble li { margin-bottom: 4px; }
.message-bubble code {
  font-family: 'Google Sans Mono', 'Fira Code', 'SF Mono', monospace;
  font-size: 0.88em;
  background-color: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
}
.message--user .message-bubble code {
  background-color: rgba(0, 0, 0, 0.08);
}
.message-bubble pre {
  background-color: var(--bg-code);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: 10px;
  border: 1px solid var(--border-color);
}
.message-bubble pre code {
  background: none;
  padding: 0;
  font-size: 0.85em;
}
.message-bubble strong { font-weight: 600; }
.message-bubble em { font-style: italic; }
.message-bubble a { color: var(--text-link); text-decoration: underline; }
.message-bubble table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 10px;
  font-size: var(--font-size-sm);
  border-radius: var(--border-radius-sm);
  overflow: hidden;
}
.message-bubble th,
.message-bubble td {
  padding: 8px 12px;
  border: 1px solid var(--border-color);
  text-align: left;
}
.message-bubble th {
  background-color: var(--bg-chip);
  font-weight: 600;
}
.message-bubble blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--spacing-md);
  color: var(--text-secondary);
  margin-bottom: 10px;
}
.message-bubble hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: var(--spacing-md) 0;
}

/* ----------------------------------------------------------
   12. 입력 영역 (Gemini 스타일)
   ---------------------------------------------------------- */
.chat-input-area {
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
  background-color: var(--bg-chat);
  flex-shrink: 0;
}

.chat-input-container {
  max-width: var(--chat-max-width);
  margin: 0 auto;
}

.chat-input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: var(--spacing-sm);
  background-color: var(--bg-input-wrapper);
  border-radius: var(--border-radius-lg);
  padding: 12px var(--spacing-sm) 12px var(--spacing-md);
  border: 1px solid var(--border-color);
  transition: border-color var(--transition), box-shadow var(--transition),
    background-color var(--transition);
  box-shadow: var(--shadow-input);
}

.chat-input-wrapper:focus-within {
  border-color: var(--color-primary);
  background-color: var(--bg-app);
  box-shadow: 0 1px 12px rgba(26, 115, 232, 0.12);
}

.chat-input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: var(--font-size-md);
  color: var(--text-primary);
  resize: none;
  line-height: 1.5;
  max-height: 180px;
  overflow-y: auto;
  min-height: 26px;
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.chat-input-hint {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
  text-align: center;
}

/* ----------------------------------------------------------
   13. 파라미터 패널
   ---------------------------------------------------------- */
.params-panel {
  width: var(--params-panel-width);
  height: 100%;
  background-color: var(--bg-params);
  border-left: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  transition: transform var(--transition-slow), width var(--transition-slow);

  transform: translateX(100%);
  width: 0;
  border-left-width: 0;
  pointer-events: none;
}

.params-panel--open {
  transform: translateX(0);
  width: var(--params-panel-width);
  border-left-width: 1px;
  pointer-events: auto;
}

.params-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.params-title {
  font-size: var(--font-size-md);
  font-weight: 600;
  color: var(--text-primary);
}

.params-close-btn {
  color: var(--text-muted);
}

/* 진행률 바 */
.params-progress {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
}

.params-progress-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--spacing-xs);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.params-progress-bar {
  height: 4px;
  background-color: var(--border-color);
  border-radius: var(--border-radius-pill);
  overflow: hidden;
}

.params-progress-fill {
  height: 100%;
  background: var(--gemini-gradient);
  border-radius: var(--border-radius-pill);
  transition: width var(--transition-slow);
}

/* 파라미터 바디 */
.params-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
}

.params-body::-webkit-scrollbar {
  width: 4px;
}

.params-body::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: var(--border-radius-pill);
}

.params-empty {
  padding: var(--spacing-xl) 0;
  text-align: center;
  color: var(--text-muted);
  font-size: var(--font-size-sm);
}

/* 파라미터 섹션 */
.params-section {
  margin-bottom: var(--spacing-md);
}

.params-section-title {
  font-size: var(--font-size-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: var(--spacing-sm) 0 var(--spacing-xs);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-sm);
}

.params-grid {
  display: grid;
  gap: var(--spacing-sm);
}

.param-item {
  background-color: var(--bg-app);
  border-radius: var(--border-radius-sm);
  padding: 10px 12px;
  border: 1px solid var(--border-color);
}

.param-item--missing {
  opacity: 0.5;
}

.param-name {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: 2px;
}

.param-value-row {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.param-value {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.param-unit {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.param-rationale {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  margin-top: 4px;
  font-style: italic;
  line-height: 1.4;
}

.param-missing-badge {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  font-style: italic;
}

/* ----------------------------------------------------------
   14. 로그인 모달 (Gemini 스타일)
   ---------------------------------------------------------- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: var(--bg-modal);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: var(--spacing-md);
  backdrop-filter: blur(4px);
}

.modal-overlay[aria-hidden="true"] {
  display: none;
}

.modal-box {
  background-color: var(--bg-modal-box);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xl);
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-modal);
  animation: modalAppear 0.2s ease;
}

@keyframes modalAppear {
  from { opacity: 0; transform: scale(0.95) translateY(-10px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--spacing-lg);
}

.modal-brand-icon {
  width: 32px;
  height: 32px;
}

.modal-brand-name {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
}

.modal-title {
  font-size: var(--font-size-xl);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: var(--spacing-sm);
}

.modal-desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

/* 폼 */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-group input {
  width: 100%;
  padding: 11px var(--spacing-md);
  font-family: inherit;
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background-color: var(--bg-app);
  border: 1px solid var(--border-input);
  border-radius: var(--border-radius-sm);
  outline: none;
  transition: border-color var(--transition);
}

.form-group input:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.15);
}

.form-error {
  font-size: var(--font-size-sm);
  color: #d93025;
  min-height: 20px;
  margin-bottom: var(--spacing-sm);
}

/* ----------------------------------------------------------
   15. 토스트 알림
   ---------------------------------------------------------- */
.toast-container {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  z-index: 2000;
  pointer-events: none;
}

.toast {
  background-color: #3c4043;
  color: #ffffff;
  padding: 10px 20px;
  border-radius: var(--border-radius-pill);
  font-size: var(--font-size-sm);
  box-shadow: var(--shadow-md);
  animation: toastAppear 0.2s ease;
  max-width: 360px;
  pointer-events: auto;
  text-align: center;
}

.toast--error { background-color: #c5221f; }
.toast--success { background-color: #137333; }

@keyframes toastAppear {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ----------------------------------------------------------
   16. 반응형 (모바일)
   ---------------------------------------------------------- */
@media (max-width: 767px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    transform: translateX(-100%);
  }

  .sidebar--open {
    transform: translateX(0);
    box-shadow: var(--shadow-modal);
  }

  .sidebar-overlay--visible {
    display: block;
  }

  .sidebar-close-btn {
    display: flex;
  }

  .menu-toggle-btn {
    display: flex;
  }

  .params-panel {
    position: fixed;
    right: 0;
    top: 0;
    height: 100vh;
    width: 0;
    transform: translateX(100%);
    z-index: 300;
    box-shadow: var(--shadow-modal);
  }

  .params-panel--open {
    width: min(var(--params-panel-width), 100vw);
    transform: translateX(0);
  }

  .message-body {
    max-width: 88%;
  }

  .user-info {
    display: none;
  }

  .welcome-greeting {
    font-size: var(--font-size-2xl);
  }

  .welcome-chips {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 479px) {
  .chat-messages {
    padding: var(--spacing-md) var(--spacing-sm);
  }

  .chat-input-area {
    padding: var(--spacing-sm);
  }

  .message-body {
    max-width: 92%;
  }
}

@media (min-width: 1024px) {
  .menu-toggle-btn {
    display: none;
  }
}

/* 고대비 모드 */
@media (prefers-contrast: high) {
  :root {
    --border-color: #000;
    --color-primary: #0040cc;
  }

  .message--user .message-bubble,
  .message--assistant .message-bubble {
    border: 1px solid var(--border-color);
  }
}

/* 애니메이션 감소 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  .message-bubble--streaming::after {
    animation: none;
  }
}