/* MOF RAG — 精致学术风格 */

:root {
  --bg: #f5f5f7;
  --sidebar-bg: #1c1c2e;
  --sidebar-hover: rgba(255,255,255,0.06);
  --sidebar-active: rgba(255,255,255,0.1);
  --sidebar-text: #a0a0b8;
  --sidebar-bright: #ffffff;
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-bg: #eef2ff;
  --primary-hover: #4338ca;
  --user-bg: #4f46e5;
  --bot-bg: #ffffff;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-tertiary: #9ca3af;
  --border: #e5e7eb;
  --border-light: #f3f4f6;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.app {
  display: flex;
  height: 100vh;
}

/* ═══════════════════════════════════════════════════
   侧边栏
   ═══════════════════════════════════════════════════ */
.sidebar {
  width: 280px;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: relative;
  z-index: 10;
  transition: transform var(--transition);
}

.sidebar-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
}

.logo h1 {
  font-size: 18px;
  font-weight: 700;
  color: var(--sidebar-bright);
  letter-spacing: 0.5px;
}

.logo .subtitle {
  font-size: 11px;
  color: var(--sidebar-text);
  margin-top: 1px;
  font-weight: 400;
}

.sidebar-content {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
}

.sidebar-content::-webkit-scrollbar { width: 4px; }
.sidebar-content::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 2px; }

/* 统计卡片 */
.stat-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin-bottom: 20px;
}

.stat-card {
  background: var(--sidebar-hover);
  border-radius: var(--radius-sm);
  padding: 12px;
  text-align: center;
}

.stat-number {
  font-size: 16px;
  font-weight: 700;
  color: var(--sidebar-bright);
  font-family: var(--font-mono);
}

.stat-label {
  font-size: 10px;
  color: var(--sidebar-text);
  margin-top: 2px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* 历史记录 */
.section-title {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--sidebar-text);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
  padding: 0 4px;
}

.history-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-empty {
  font-size: 12px;
  color: rgba(255,255,255,0.25);
  text-align: center;
  padding: 20px 0;
}

.history-item {
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--sidebar-text);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-bright);
}

/* 底部 */
.sidebar-footer {
  padding: 12px 16px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.settings-btn {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--sidebar-text);
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.settings-btn:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-bright);
}

/* 设置面板 */
.settings-panel {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--sidebar-bg);
  border-top: 1px solid rgba(255,255,255,0.1);
  padding: 16px;
  transform: translateY(100%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 20;
}

.settings-panel.open {
  transform: translateY(0);
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.settings-header h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--sidebar-bright);
}

.setting-group {
  margin-bottom: 14px;
}

.setting-group label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--sidebar-text);
  margin-bottom: 6px;
}

.setting-group input[type="password"],
.setting-group select {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: var(--radius-sm);
  background: rgba(0,0,0,0.3);
  color: #fff;
  font-size: 13px;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color var(--transition);
}

.setting-group input:focus,
.setting-group select:focus {
  border-color: var(--primary-light);
}

.setting-group input[type="range"] {
  width: 100%;
  accent-color: var(--primary);
  margin-top: 4px;
}

.badge {
  display: inline-block;
  padding: 1px 6px;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-mono);
}

.btn-primary {
  width: 100%;
  padding: 10px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  transition: background var(--transition);
}

.btn-primary:hover { background: var(--primary-hover); }

.btn-icon {
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--sidebar-text);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.btn-icon:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-bright);
}

/* ═══════════════════════════════════════════════════
   主区域
   ═══════════════════════════════════════════════════ */
.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* 顶部栏 */
.topbar {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}

.topbar-title {
  font-size: 15px;
  font-weight: 600;
}

/* 消息区 */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  scroll-behavior: smooth;
}

.messages::-webkit-scrollbar { width: 6px; }
.messages::-webkit-scrollbar-thumb { background: #d1d5db; border-radius: 3px; }
.messages::-webkit-scrollbar-thumb:hover { background: #9ca3af; }

/* 欢迎页 */
.welcome {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 20px;
  min-height: 60vh;
  animation: fadeIn 0.5s ease;
}

.welcome-icon {
  width: 72px;
  height: 72px;
  background: var(--primary-bg);
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
}

.welcome h2 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}

.welcome > p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.examples {
  display: flex;
  flex-direction: column;
  gap: 10px;
  width: 100%;
  max-width: 480px;
}

.example-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: #fff;
  color: var(--text);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
}

.example-card:hover {
  border-color: var(--primary);
  background: var(--primary-bg);
  box-shadow: var(--shadow-sm);
  transform: translateY(-1px);
}

.example-icon {
  font-size: 20px;
  flex-shrink: 0;
}

/* 消息气泡 */
.message {
  display: flex;
  gap: 12px;
  max-width: 820px;
  margin: 0 auto 20px;
  animation: slideUp 0.3s ease;
}

.message.user { flex-direction: row-reverse; }

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

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg-avatar {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 2px;
}

.message.user .msg-avatar {
  background: var(--user-bg);
  color: #fff;
}

.message.bot .msg-avatar {
  background: var(--primary-bg);
  color: var(--primary);
}

.msg-body {
  flex: 1;
  min-width: 0;
}

.msg-content {
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  font-size: 14px;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}

.message.user .msg-content {
  background: var(--user-bg);
  color: #fff;
  border-bottom-right-radius: 4px;
}

.message.bot .msg-content {
  background: var(--bot-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow-sm);
}

/* 检索来源 */
.sources {
  margin-top: 10px;
  padding: 12px 14px;
  background: linear-gradient(135deg, #f8faff, #f0f4ff);
  border: 1px solid #e0e7ff;
  border-radius: var(--radius-md);
  font-size: 12px;
}

.sources-header {
  display: flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 8px;
  font-size: 12px;
}

.source-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  color: var(--text-secondary);
  font-size: 12px;
  font-family: var(--font-mono);
}

.source-index {
  width: 18px;
  height: 18px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  flex-shrink: 0;
}

.source-relevance {
  margin-left: auto;
  padding: 1px 6px;
  background: #dcfce7;
  color: #16a34a;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 600;
}

/* 加载动画 */
.typing-indicator {
  display: flex;
  gap: 5px;
  padding: 18px;
}

.typing-dot {
  width: 8px;
  height: 8px;
  background: #c4b5fd;
  border-radius: 50%;
  animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }

@keyframes typing {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-8px); opacity: 1; }
}

/* ═══════════════════════════════════════════════════
   输入区
   ═══════════════════════════════════════════════════ */
.input-area {
  padding: 0 24px 20px;
  background: var(--bg);
}

.input-container {
  max-width: 820px;
  margin: 0 auto;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 10px 14px;
  box-shadow: var(--shadow-md);
  transition: all var(--transition);
}

.input-container:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79,70,229,0.1), var(--shadow-md);
}

#input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 14px;
  font-family: inherit;
  line-height: 1.6;
  resize: none;
  max-height: 140px;
  background: transparent;
  color: var(--text);
}

#input::placeholder {
  color: var(--text-tertiary);
}

.input-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

.char-count {
  font-size: 11px;
  color: var(--text-tertiary);
  font-family: var(--font-mono);
}

.send-btn {
  width: 34px;
  height: 34px;
  border: none;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

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

.send-btn:disabled {
  background: #d1d5db;
  cursor: not-allowed;
}

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

/* ═══════════════════════════════════════════════════
   响应式
   ═══════════════════════════════════════════════════ */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    transform: translateX(-100%);
    z-index: 100;
  }
  .sidebar.open { transform: translateX(0); }
  .topbar { display: flex; }
  .messages { padding: 16px; }
  .input-area { padding: 0 12px 12px; }
  .welcome h2 { font-size: 22px; }
}