/* ==========================================================================
   问源 · 我的知识库 (Quiet Research Archive Theme v2)
   视觉规范：灰白大场域、细线、圆润、顶部胶囊导航、克制自然、手机可用
   ========================================================================== */

@font-face {
  font-family: 'Manrope';
  src: url('/library/assets/Manrope-VF.ttf') format('truetype');
  font-weight: 200 800;
  font-display: swap;
}

@font-face {
  font-family: 'HanyiFangSong';
  src: url('/library/assets/HYFangSongJ.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  /* 灰白场域系统 */
  --bg-canvas: #ffffff;
  --bg-field: #f2f2f2;
  --bg-subtle: #f8f8f8;
  --bg-hover: #ebebeb;

  /* 文字墨色系统 */
  --color-text: #292929;
  --color-text-secondary: #686868;
  --color-text-muted: #686868;

  /* 细线系统 */
  --border-hairline: #dedede;
  --border-strong: #bfbfbf;

  /* 胶囊选中与主动作强调色 */
  --color-accent: #292929;
  --color-accent-text: #ffffff;

  /* 语义反馈色 */
  --color-error: #b83232;
  --color-error-bg: #fdf2f2;
  --color-error-border: #f5c2c2;
  --color-success: #287d46;
  --color-success-bg: #f2f9f4;
  --color-success-border: #bce3cb;

  /* 圆角规范 */
  --radius-field: 32px;
  --radius-container: 24px;
  --radius-interactive: 16px;
  --radius-sm: 8px;
  --radius-capsule: 999px;

  /* 字体家族 */
  --font-sans: 'Manrope', 'HanyiFangSong', "汉仪仿宋简", "HYFangSongJ", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  /* 动画过渡规范 */
  --ease-settle: cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: 0.18s cubic-bezier(0.2, 0.8, 0.2, 1);
  --transition-normal: 0.28s var(--ease-settle);
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  min-height: 100%;
  background-color: var(--bg-canvas);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 文本选择高亮 */
::selection {
  background-color: var(--color-text);
  color: #ffffff;
}

/* 键盘可访问性焦点轮廓 */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* 通用隐藏工具类 (必须支持 !important 保证JS显隐逻辑稳定) */
.hidden {
  display: none !important;
}

/* 无障碍屏幕阅读器专用 */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ==========================================================================
   主应用框架 (App Layout)
   ========================================================================== */

.app-layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  width: 100%;
  background-color: var(--bg-canvas);
}

/* --------------------------------------------------------------------------
   顶部导航栏 (横向容器，保留 id="sidebar")
   -------------------------------------------------------------------------- */

.top-nav-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-hairline);
  width: 100%;
}

.nav-container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 56px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

/* 左侧“问源.”字标 */
.nav-brand {
  display: flex;
  align-items: center;
}

.brand-wordmark {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.8px;
  color: var(--color-text);
  user-select: none;
}

/* 中部浅灰胶囊导航 */
.capsule-nav {
  position: relative;
  isolation: isolate;
  background-color: var(--bg-field);
  border-radius: var(--radius-capsule);
  padding: 4px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.capsule-tab {
  position: relative;
  z-index: 1;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  padding: 8px 20px;
  border-radius: var(--radius-capsule);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition-normal), background-color var(--transition-normal);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
  min-height: 44px;
}

.capsule-tab:hover:not(.active) {
  color: var(--color-text);
  background-color: var(--bg-hover);
}

.capsule-tab.active {
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  font-weight: 500;
}

.nav-indicator {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  border-radius: inherit;
  background: var(--color-accent);
  pointer-events: none;
  opacity: 0;
}
.capsule-nav.has-indicator .nav-indicator { opacity: 1; }
.capsule-nav.has-indicator .capsule-tab.active { background: transparent; }

.nav-count-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 1px 7px;
  border-radius: var(--radius-capsule);
  background: rgba(0, 0, 0, 0.08);
  color: inherit;
  font-variant-numeric: tabular-nums;
}

.capsule-tab.active .nav-count-badge {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
}

/* 右侧轻文字链接与退出 */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.nav-action-link, .nav-action-btn {
  font-family: inherit;
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.nav-action-link:hover, .nav-action-btn:hover {
  color: var(--color-text);
  background-color: var(--bg-subtle);
}

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

/* --------------------------------------------------------------------------
   主展示区与上下文栏 (Main Content)
   -------------------------------------------------------------------------- */

.main-content {
  flex: 1;
  width: 100%;
}

.content-wrapper {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 56px 64px;
}

/* 主区顶部细小上下文行 */
.context-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  margin-bottom: 24px;
}

.view-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  letter-spacing: -0.2px;
}

.context-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.workspace-select, .sidebar-select {
  min-height: 44px;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 10px;
  padding: 6px 12px;
  font-size: 13px;
  color: var(--color-text);
  font-family: inherit;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.workspace-select:focus, .sidebar-select:focus {
  border-color: var(--color-text);
  background-color: #ffffff;
}

.doc-counter-pill {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  padding: 5px 14px;
  border-radius: var(--radius-capsule);
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.doc-counter-pill strong {
  color: var(--color-text);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* 选项卡容器基础规范 */
.tab-view {
  width: 100%;
}

.view-stage { position: relative; min-width: 0; }
/* These surfaces are coordinated by Web Animations. A global reduced-motion
   duration must not turn their geometry updates into implicit CSS transitions. */
.nav-indicator, .view-stage, .view-stage > .tab-view,
.source-sidebar, .source-scrim, .login-modal-overlay { transition-property: none; }
.view-stage.is-transitioning { overflow: clip; overflow-anchor: none; }
.view-stage > .tab-view { display: flow-root; }
.view-stage > .tab-view.is-leaving {
  position: absolute;
  inset: 0 0 auto;
  pointer-events: none;
}

/* ==========================================================================
   视图1：资料检索 (Search View)
   ========================================================================== */

/* 浅灰大圆角场域 */
.search-hero-field {
  background-color: var(--bg-field);
  border-radius: var(--radius-field);
  padding: 56px 56px 44px;
  margin-bottom: 40px;
}

.hero-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  margin-bottom: 36px;
}

.hero-text-col {
  flex: 1;
  min-width: 0;
}

.hero-main-title {
  font-size: 56px;
  line-height: 1.1;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -1px;
  margin-bottom: 20px;
}

.hero-divider {
  height: 1px;
  background-color: var(--border-hairline);
  max-width: 380px;
  margin-bottom: 20px;
}

.hero-subtitle {
  font-size: 16px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.hero-visual-col {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-companion-img {
  width: 160px;
  height: 160px;
  object-fit: contain;
  display: block;
}

/* 宽白色搜索框 */
.search-form {
  width: 100%;
}

.search-input-box {
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-interactive);
  padding: 6px 8px 6px 24px;
  display: flex;
  align-items: center;
  box-shadow: none;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.search-input-box:focus-within {
  border-color: var(--color-text);
  box-shadow: 0 0 0 4px rgba(41, 41, 41, 0.035), 0 10px 28px -16px rgba(41, 41, 41, 0.12);
}

.search-input {
  flex: 1;
  min-width: 0;
  border: none;
  outline: none;
  background: transparent;
  font-size: 16px;
  color: var(--color-text);
  padding: 12px 0;
  font-family: inherit;
}

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

.search-submit-btn {
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  border: none;
  border-radius: 12px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity var(--transition-fast);
  min-height: 44px;
  white-space: nowrap;
}

.search-submit-btn:hover:not(:disabled) {
  opacity: 0.88;
}

.search-meta-hint {
  font-size: 13px;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 14px;
  padding-left: 6px;
}

.hint-dot {
  color: var(--border-hairline);
}

/* 检索结果呈现区 (场域外保持开阔，不包装密集卡片) */
.search-results-section {
  margin-top: 32px;
}

.results-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 24px;
}

.results-heading {
  font-size: 20px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.results-badge, .results-count-badge {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  padding: 3px 12px;
  border-radius: var(--radius-capsule);
  border: 1px solid var(--border-hairline);
  font-variant-numeric: tabular-nums;
}

/* 初始空白引导块 (在 results-list 外，由主模型后续接上显示逻辑) */
.search-initial-guide {
  padding: 48px 0;
  text-align: left;
}

.initial-guide-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.2px;
}

.initial-guide-text {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 检索结果列表容器 */
.results-list {
  display: flex;
  flex-direction: column;
}

.result-item-card {
  border-bottom: 1px solid var(--border-hairline);
  padding: 28px 0;
  transition: background-color var(--transition-fast);
}

.result-item-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 10px;
}

.result-item-title {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
  line-height: 1.4;
  letter-spacing: -0.2px;
}

.result-score-badge {
  font-size: 12px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  padding: 2px 8px;
  border-radius: 6px;
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}

.result-meta-line {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 14px;
}

.result-snippet-box {
  background-color: var(--bg-subtle);
  border-radius: var(--radius-interactive);
  padding: 18px 22px;
  margin-bottom: 16px;
}

.result-snippet-text {
  font-size: 17px;
  color: var(--color-text);
  line-height: 1.8;
  white-space: pre-wrap;
  word-break: break-word;
}

.result-score-explanation {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

.result-actions-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 10px;
}

/* ==========================================================================
   视图2：智能研读 (Chat / Smart Study View)
   ========================================================================== */

.chat-view-container {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 160px);
  min-height: 540px;
}

.chat-header-bar {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 20px;
}

.chat-ability-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
}

.chat-messages-container {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 8px 4px 24px;
}

.chat-message-item {
  display: flex;
  flex-direction: column;
  max-width: 100%;
}

.chat-message-user {
  align-self: flex-end;
  max-width: 80ch;
}

.chat-message-assistant {
  align-self: flex-start;
  width: 100%;
  max-width: 80ch;
}

.message-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: 6px;
}

.chat-message-user .message-meta {
  justify-content: flex-end;
}

.meta-sender {
  font-weight: 500;
  color: var(--color-text-secondary);
}

.meta-time {
  font-variant-numeric: tabular-nums;
}

.message-bubble {
  border-radius: 20px;
  font-size: 17px;
  line-height: 1.8;
}

.user-bubble {
  background-color: var(--bg-field);
  color: var(--color-text);
  padding: 14px 20px;
  white-space: pre-wrap;
  word-break: break-word;
}

.assistant-bubble {
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  padding: 22px 26px;
  color: var(--color-text);
}

.system-bubble {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  color: var(--color-text-secondary);
  padding: 16px 20px;
}

.answer-body {
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.8;
}

/* 研读引用文献卡片 */
.chat-sources-block {
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-hairline);
}

.sources-heading {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 10px;
}

.sources-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.source-item {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 12px 16px;
  font-size: 13px;
}

.source-item-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 6px;
}

.source-item-title {
  overflow-wrap: anywhere;
  min-width: 0;
  font-weight: 500;
  color: var(--color-text);
}

.source-item-score {
  font-size: 12px;
  color: var(--color-text-muted);
  font-variant-numeric: tabular-nums;
}

.source-item-text {
  color: var(--color-text-secondary);
  line-height: 1.6;
  white-space: pre-wrap;
  margin-bottom: 8px;
}

/* 对话输入栏卡片 */
.chat-composer-wrap {
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-container);
  padding: 16px 20px;
  margin-top: 12px;
  flex-shrink: 0;
}

.chat-textarea {
  width: 100%;
  border: none;
  outline: none;
  background: transparent;
  font-size: 16px;
  color: var(--color-text);
  font-family: inherit;
  line-height: 1.6;
  resize: vertical;
  min-height: 64px;
}

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

.chat-controls-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 10px;
  border-top: 1px solid var(--border-hairline);
  margin-top: 8px;
}

.model-badge {
  font-size: 12px;
  color: var(--color-text-muted);
  background-color: var(--bg-subtle);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-hairline);
}

.chat-right-btns {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ==========================================================================
   视图3：文档管理 (Documents View)
   ========================================================================== */

.docs-view-wrap {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.docs-page-header {
  margin-bottom: 4px;
}

.docs-section-title {
  font-size: 24px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.docs-forms-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.docs-form-panel {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-container);
  padding: 32px;
  display: flex;
  flex-direction: column;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.panel-title {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
}

.panel-tag {
  font-size: 12px;
  color: var(--color-text-secondary);
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  padding: 2px 8px;
  border-radius: 6px;
}

.panel-desc {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

/* 文件拖曳与上传域 */
.file-drop-area {
  border: 1px dashed var(--border-hairline);
  border-radius: var(--radius-interactive);
  background-color: #ffffff;
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  position: relative;
  transition: border-color var(--transition-fast), background-color var(--transition-fast);
  margin-bottom: 16px;
}

.file-drop-area:hover, .file-drop-area.drag-over {
  border-color: var(--color-text);
  background-color: var(--bg-field);
}

.file-hidden-input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
  width: 100%;
  height: 100%;
}

.drop-text {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  word-break: break-word;
  overflow-wrap: break-word;
}

.drop-subtext {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-top: 6px;
}

/* 已入库文档总览清单 */
.docs-list-section {
  margin-top: 8px;
}

.docs-list-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 16px;
}

.list-title-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

.list-heading {
  font-size: 18px;
  font-weight: 500;
  color: var(--color-text);
}

.badge-count {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  padding: 2px 10px;
  border-radius: var(--radius-capsule);
  font-variant-numeric: tabular-nums;
}

.docs-container {
  display: flex;
  flex-direction: column;
}

.doc-item-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.doc-item-info {
  flex: 1;
  min-width: 0;
}

.doc-item-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-item-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 13px;
  color: var(--color-text-muted);
}

.doc-item-actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

/* ==========================================================================
   视图4：微信接入 (WeChat View)
   ========================================================================== */

.wechat-view-wrap {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.wechat-page-header {
  margin-bottom: 4px;
}

.wechat-section-title {
  font-size: 24px;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.3px;
}

.wechat-content-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 28px;
  align-items: start;
}

.wechat-panel {
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-container);
  padding: 32px;
}

.wechat-card-status {
  background-color: var(--bg-subtle);
}

.wechat-card-guide {
  background-color: #ffffff;
}

.badge-status {
  font-size: 12px;
  padding: 2px 10px;
  border-radius: var(--radius-capsule);
  font-weight: 500;
}

.badge-online {
  background-color: var(--color-success-bg);
  color: var(--color-success);
  border: 1px solid var(--color-success-border);
}

.badge-offline {
  background-color: #ffffff;
  color: var(--color-text-muted);
  border: 1px solid var(--border-hairline);
}

.wechat-info-rows {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0 24px;
  font-size: 14px;
}

.info-row {
  display: flex;
  gap: 12px;
}

.info-label {
  color: var(--color-text-secondary);
  width: 120px;
  flex-shrink: 0;
}

.info-val {
  color: var(--color-text);
  font-weight: 500;
  word-break: break-all;
}

.font-mono {
  font-family: var(--font-mono);
}

/* 二维码与操作栏 */
.wechat-qr-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 24px;
}

.qr-box {
  width: 220px;
  height: 220px;
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 18px;
}

.qr-placeholder-text {
  font-size: 13px;
  color: var(--color-text-muted);
  text-align: center;
  padding: 20px;
}

.qr-image {
  width: 200px;
  height: 200px;
  object-fit: contain;
}

.qr-loading-overlay {
  position: absolute;
  inset: 0;
  background-color: rgba(255, 255, 255, 0.94);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.wechat-qr-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.wechat-poll-tip {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--color-text-secondary);
  margin-top: 14px;
}

.pulsing-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: #e05a36;
  animation: dotPulse 1.4s infinite ease-in-out;
}

@keyframes dotPulse {
  0%, 100% { opacity: 0.4; transform: scale(0.9); }
  50% { opacity: 1; transform: scale(1.2); }
}

.wechat-ws-box {
  border-top: 1px solid var(--border-hairline);
  padding-top: 20px;
  margin-top: 20px;
}

.sub-setting-title {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 4px;
}

.sub-setting-desc {
  font-size: 13px;
  color: var(--color-text-muted);
  margin-bottom: 12px;
}

.wechat-ws-form {
  display: flex;
  gap: 10px;
}

/* 微信使用说明卡片 (4步骤) */
.guide-steps-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin: 20px 0;
}

.guide-step {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.step-badge {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background-color: var(--bg-field);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 600;
  flex-shrink: 0;
  margin-top: 2px;
}

.step-heading {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 4px;
}

.step-summary {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.step-summary code {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text);
}

.guide-tip-pill {
  font-size: 13px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-interactive);
  padding: 12px 16px;
}

/* ==========================================================================
   密码登录遮罩层 (Login Modal)
   ========================================================================== */

.login-modal-overlay {
  position: fixed;
  inset: 0;
  background-color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 24px;
  overflow-y: auto;
}

.login-card {
  width: 100%;
  max-width: 920px;
  background-color: #ffffff;
  border-radius: var(--radius-field);
  border: 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  box-shadow: none;
}

.login-aside {
  background-color: var(--bg-field);
  border-radius: var(--radius-container);
  margin: 12px;
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 380px;
}

.login-aside-brand {
  font-size: 26px;
  font-weight: 600;
  color: var(--color-text);
  letter-spacing: -0.8px;
}

.login-aside-quote {
  font-size: 28px;
  line-height: 1.3;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: -0.5px;
}

.login-companion {
  width: 96px;
  height: 96px;
  object-fit: contain;
  display: block;
}

.login-main {
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.login-title {
  font-size: 24px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 6px;
  letter-spacing: -0.5px;
}

.login-subtitle {
  font-size: 14px;
  color: var(--color-text-secondary);
  margin-bottom: 28px;
}

.login-footer {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-top: 24px;
  text-align: center;
}

/* ==========================================================================
   来源资料全文阅览抽屉 (Source Sidebar Drawer)
   ========================================================================== */

.source-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  max-width: 520px;
  background-color: #ffffff;
  border-left: 1px solid var(--border-hairline);
  border-radius: 24px 0 0 24px;
  z-index: 90;
  display: flex;
  flex-direction: column;
  box-shadow: -8px 0 32px rgba(0, 0, 0, 0.05);
}

.source-sidebar-header {
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-hairline);
}

.source-header-title {
  font-size: 16px;
  font-weight: 500;
  color: var(--color-text);
}

.source-close-btn {
  width: 44px;
  height: 44px;
  border: none;
  background: transparent;
  color: var(--color-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.source-close-btn:hover {
  background-color: var(--bg-subtle);
  color: var(--color-text);
}

.source-sidebar-body {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
}

.source-doc-header {
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-hairline);
  margin-bottom: 20px;
}

.source-doc-title {
  font-size: 20px;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.4;
  margin-bottom: 10px;
}

.source-meta-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.source-meta-tag {
  overflow-wrap: anywhere;
  font-size: 12px;
  color: var(--color-text-secondary);
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  padding: 2px 8px;
  border-radius: 4px;
}

.source-actions-bar {
  margin-top: 10px;
}

.source-text-wrapper {
  padding: 0;
}

.source-doc-text {
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-text);
  white-space: pre-wrap;
  word-break: break-word;
}

/* ==========================================================================
   通用交互控件 (Buttons / Forms / Spinners / Toast)
   ========================================================================== */

/* 按钮基础规范 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 9px 20px;
  border-radius: var(--radius-interactive);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  min-height: 44px;
  white-space: nowrap;
}

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

.btn-primary:hover:not(:disabled) {
  opacity: 0.9;
}

.btn-secondary {
  background-color: #ffffff;
  color: var(--color-text);
  border-color: var(--border-hairline);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  border-color: var(--border-strong);
}

.btn-danger {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border-color: var(--color-error-border);
}

.btn-danger:hover:not(:disabled) {
  background-color: #fce4e4;
}

.btn-sm {
  font-size: 13px;
  padding: 6px 14px;
  min-height: 44px;
  border-radius: 10px;
}

.btn-block {
  width: 100%;
}

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

/* 表单控件规范 */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: 6px;
}

.form-input, .form-textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 15px;
  color: var(--color-text);
  background-color: #ffffff;
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  outline: none;
  font-family: inherit;
  transition: border-color var(--transition-fast);
}

.form-input:focus, .form-textarea:focus {
  border-color: var(--color-text);
}

.form-error {
  padding: 10px 14px;
  font-size: 13px;
  color: var(--color-error);
  background-color: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: 10px;
  margin-bottom: 14px;
}

/* 状态面板 (Loading / Error / Empty) */
.state-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  text-align: center;
  border-radius: var(--radius-container);
  margin: 16px 0;
}

.loading-panel {
  background-color: transparent;
}

.empty-panel {
  background-color: var(--bg-subtle);
  border: 1px dashed var(--border-hairline);
}

.error-panel {
  background-color: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
}

.state-text {
  font-size: 14px;
  color: var(--color-text-secondary);
  max-width: 480px;
  line-height: 1.6;
}

.error-panel .state-text {
  color: var(--color-error);
}

/* 加载动画 */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-hairline);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

.btn-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 消息提示浮层 (Toast Notification) */
.toast-container {
  position: fixed;
  bottom: 28px;
  right: 28px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 2000;
  pointer-events: none;
}

.toast {
  pointer-events: auto;
  background-color: var(--color-accent);
  color: var(--color-accent-text);
  padding: 10px 18px;
  border-radius: 12px;
  font-size: 14px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
  border: 1px solid #444;
  max-width: 360px;
}

.toast-error {
  background-color: var(--color-error);
  border-color: #9c2828;
}

/* ==========================================================================
   响应式规范 (Mobile & Tablet)
   ========================================================================== */

/* Quiet feedback borrowed from the reference, without moving reading rows. */
.btn, .search-submit-btn {
  transition: background-color var(--transition-normal), border-color var(--transition-normal), color var(--transition-normal), box-shadow var(--transition-normal), transform var(--transition-fast), opacity var(--transition-fast);
}
.btn:active:not(:disabled), .search-submit-btn:active:not(:disabled) { transform: scale(0.98); }
.form-input, .form-textarea {
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.form-input:focus, .form-textarea:focus { box-shadow: 0 0 0 3px rgba(41, 41, 41, 0.035); }
.history-item { transition: background-color var(--transition-normal), border-color var(--transition-normal); }
.nav-count-badge { transition: background-color var(--transition-normal), color var(--transition-normal); }
@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover:not(:disabled), .search-submit-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px -10px rgba(41, 41, 41, 0.3);
  }
  .btn-primary:active:not(:disabled), .search-submit-btn:active:not(:disabled) { transform: translateY(0) scale(0.98); }
}
.source-scrim {
  position: fixed;
  inset: 0;
  z-index: 80;
  border: 0;
  background: rgba(41, 41, 41, 0.16);
  cursor: pointer;
}
.source-scrim[inert] { pointer-events: none; }
.settings-dialog[open], .chat-manage-dialog[open] {
  animation: surface-enter 320ms var(--ease-settle) both;
}
.settings-dialog[open]::backdrop, .chat-manage-dialog[open]::backdrop {
  animation: scrim-enter 220ms ease-out both;
}
.toast { animation: surface-enter 240ms var(--ease-settle) both; }
@keyframes surface-enter {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes scrim-enter { from { opacity: 0; } to { opacity: 1; } }

@media (max-width: 1024px) {
  .nav-container {
    padding: 0 28px;
  }

  .content-wrapper {
    padding: 0 28px 48px;
  }

  .docs-forms-row {
    grid-template-columns: 1fr;
  }

  .wechat-content-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .nav-container {
    padding: 10px 18px;
    height: auto;
    flex-wrap: wrap;
    row-gap: 12px;
  }

  .nav-brand {
    order: 1;
  }

  .nav-actions {
    order: 2;
  }

  .capsule-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .capsule-tab {
    padding: 7px 14px;
    font-size: 16px;
  }

  .content-wrapper {
    padding: 0 18px 48px;
  }

  .context-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding: 14px 0;
  }

  .context-right {
    width: 100%;
    justify-content: space-between;
  }

  .search-hero-field {
    padding: 32px 20px 24px;
    border-radius: 24px;
  }

  .hero-top-row {
    gap: 20px;
    margin-bottom: 24px;
  }

  .hero-main-title {
    font-size: 32px;
  }

  .hero-companion-img {
    width: 84px;
    height: 84px;
  }

  .search-input-box {
    padding: 4px 6px 4px 16px;
  }

  .search-input {
    font-size: 16px;
    padding: 10px 0;
  }

  .search-submit-btn {
    padding: 10px 18px;
    font-size: 14px;
  }

  .chat-view-container {
    height: calc(100vh - 220px);
  }

  .chat-message-user, .chat-message-assistant {
    max-width: 100%;
  }

  .chat-controls-bar {
    flex-wrap: wrap;
    gap: 12px;
  }

  .chat-right-btns {
    margin-left: auto;
  }

  .context-right {
    gap: 10px;
  }

  .workspace-selector-wrap {
    flex: 1;
    min-width: 0;
  }

  .workspace-select {
    width: 100%;
  }

  .form-input, .form-textarea, .sidebar-select {
    font-size: 16px;
  }

  .wechat-ws-form {
    flex-direction: column;
  }

  .wechat-ws-form .sidebar-select {
    width: 100%;
    min-width: 0;
  }

  .wechat-ws-form .btn {
    align-self: flex-start;
  }

  .doc-item-card {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .doc-item-title {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .doc-item-actions {
    flex-wrap: wrap;
  }

  .login-card {
    grid-template-columns: 1fr;
    border-radius: 24px;
  }

  .login-aside {
    min-height: auto;
    padding: 24px;
    margin: 8px;
    border-radius: 18px;
  }

  .login-aside-quote {
    font-size: 20px;
    margin: 16px 0;
  }

  .login-companion {
    width: 64px;
    height: 64px;
  }

  .login-main {
    padding: 28px 20px;
  }

  .source-sidebar {
    max-width: 100%;
    border-radius: 0;
  }
}

/* 遵守系统的动效减弱偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}