/* ===== CSS 变量：主题 ===== */
:root,
[data-theme="dark"] {
  --bg-body:        linear-gradient(135deg, #475569, #1e293b);
  --bg-app:         rgba(30, 41, 59, 0.95);
  --bg-sidebar:     rgba(51, 65, 85, 0.5);
  --bg-rightbar:    rgba(51, 65, 85, 0.5);
  --bg-chat:        linear-gradient(135deg, rgba(71,85,105,0.3), rgba(30,41,59,0.6));
  --bg-bubble-ai:   rgba(51, 65, 85, 0.7);
  --bg-textarea:    rgba(51, 65, 85, 0.6);
  --bg-session:     rgba(71, 85, 105, 0.4);
  --bg-link-item:   rgba(71, 85, 105, 0.4);
  --bg-refs-a:      rgba(71, 85, 105, 0.3);
  --bg-refs-a-hov:  rgba(71, 85, 105, 0.5);

  --border:         rgba(100, 116, 139, 0.5);
  --border-header:  rgba(148, 163, 184, 0.4);
  --border-input:   rgba(100, 116, 139, 0.6);
  --border-bubble:  rgba(100, 116, 139, 0.6);
  --border-refs:    rgba(100, 116, 139, 0.5);

  --text-main:      #f1f5f9;
  --text-sub:       #9ca3af;
  --text-link:      #60a5fa;
  --text-ghost:     #e5e7eb;

  --scrollbar-track:  rgba(71, 85, 105, 0.3);
  --scrollbar-thumb:  rgba(99, 102, 241, 0.6);
  --scrollbar-hover:  rgba(99, 102, 241, 0.8);

  --modal-bg:       rgba(0,0,0,0.75);
  --modal-img-bg:   #020617;
  --topbar-bg:      var(--bg-app);
  --topbar-text:    var(--text-main);

  --theme-btn-label: "🌙 暗色";
}

[data-theme="light"] {
  --bg-body:        linear-gradient(135deg, #e2e8f0, #f8fafc);
  --bg-app:         rgba(255, 255, 255, 0.97);
  --bg-sidebar:     rgba(241, 245, 249, 0.9);
  --bg-rightbar:    rgba(241, 245, 249, 0.9);
  --bg-chat:        linear-gradient(135deg, rgba(226,232,240,0.5), rgba(248,250,252,0.8));
  --bg-bubble-ai:   rgba(255, 255, 255, 0.9);
  --bg-textarea:    rgba(255, 255, 255, 0.95);
  --bg-session:     rgba(226, 232, 240, 0.7);
  --bg-link-item:   rgba(226, 232, 240, 0.7);
  --bg-refs-a:      rgba(219, 234, 254, 0.5);
  --bg-refs-a-hov:  rgba(199, 210, 254, 0.6);

  --border:         rgba(148, 163, 184, 0.6);
  --border-header:  rgba(148, 163, 184, 0.5);
  --border-input:   rgba(148, 163, 184, 0.7);
  --border-bubble:  rgba(148, 163, 184, 0.5);
  --border-refs:    rgba(148, 163, 184, 0.5);

  --text-main:      #0f172a;
  --text-sub:       #64748b;
  --text-link:      #2563eb;
  --text-ghost:     #1e293b;

  --scrollbar-track:  rgba(203, 213, 225, 0.5);
  --scrollbar-thumb:  rgba(99, 102, 241, 0.5);
  --scrollbar-hover:  rgba(99, 102, 241, 0.8);

  --modal-bg:       rgba(0,0,0,0.55);
  --modal-img-bg:   #f8fafc;
  --topbar-bg:      #2563eb;
  --topbar-text:    #ffffff;
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
  font-size: 16px;
  background: var(--bg-body);
  color: var(--text-main);
  height: 100vh;
  height: 100dvh;
  width: 100%;
  max-width: 100vw;
  overflow: hidden;
  transition: background 0.3s, color 0.3s;
  -webkit-tap-highlight-color: transparent;
}

body.scroll-lock {
  overflow: hidden;
  touch-action: none;
}

/* ===== 整体布局 ===== */
.app {
  width: 100%;
  max-width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: var(--bg-app);
  display: flex;
  flex-direction: column;
  --topbar-h: 64px;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
}

.top-title-bar {
  height: var(--topbar-h);
  min-height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: var(--safe-top) calc(20px + var(--safe-right)) 0
    calc(20px + var(--safe-left));
  border-bottom: 1px solid var(--border-header);
  background: var(--topbar-bg);
  flex-shrink: 0;
}

.top-logo {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.top-title-text {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  color: var(--topbar-text);
}

.app-body {
  flex: 1;
  display: grid;
  grid-template-columns: 280px 1fr 260px;
  min-height: 0;
}

/* 右侧栏隐藏时收起列 */
.app.no-rightbar .app-body {
  grid-template-columns: 280px 1fr;
  overflow: hidden;
  border: 1px solid var(--border);
  transition: background 0.3s;
}

/* 左侧会话栏收起态 */
.app.sidebar-collapsed .app-body {
  grid-template-columns: 68px 1fr 260px;
}

.app.sidebar-collapsed.no-rightbar .app-body {
  grid-template-columns: 68px 1fr;
}

/* ===== 左侧会话栏 ===== */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
  transition: background 0.3s;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.sidebar-toggle-btn {
  width: 34px;
  height: 30px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

.sidebar-actions {
  padding-top: 4px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border-header);
  padding-bottom: 10px;
}

.new-session-btn {
  width: 100%;
}

.clear-sessions-btn {
  width: 100%;
  margin-top: 8px;
  color: #ef4444;
  border-color: rgba(239, 68, 68, 0.45);
}

.app.sidebar-collapsed .brand,
.app.sidebar-collapsed .sidebar-actions,
.app.sidebar-collapsed .session-title {
  display: none;
}

.app.sidebar-collapsed .session-item {
  min-height: 36px;
  padding: 0;
}

.app.sidebar-collapsed .session-list {
  display: none;
}

.new-session-icon-btn {
  display: none;
}

.app.sidebar-collapsed .new-session-icon-btn {
  display: inline-flex;
}

.app.sidebar-collapsed .sidebar-header {
  flex-direction: column;
  justify-content: flex-start;
  align-items: center;
}

.app.sidebar-collapsed #sidebar-toggle-btn {
  order: 1;
}

.app.sidebar-collapsed #new-session-icon-btn {
  order: 2;
}

.brand {
  font-size: 18px;
  font-weight: 700;
}

.session-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.session-item {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid transparent;
  background: var(--bg-session);
  cursor: pointer;
  transition: all 0.15s ease;
  font-size: 15px;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.session-item:hover  { border-color: rgba(99, 102, 241, 0.6); }
.session-item.active { border-color: rgba(99, 102, 241, 0.9); box-shadow: 0 4px 16px rgba(99,102,241,0.25); }

.session-title { font-size: 15px; margin-bottom: 0; }
.session-title {
  max-width: 12em;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.session-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.session-item:hover .session-actions,
.session-item.active .session-actions {
  opacity: 1;
}

.session-action-btn {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  border: 1px solid var(--border-input);
  background: transparent;
  color: var(--text-sub);
  cursor: pointer;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.session-action-btn:hover {
  color: var(--text-main);
  background: rgba(99, 102, 241, 0.12);
}

.session-action-btn.danger:hover {
  color: #ef4444;
  background: rgba(239, 68, 68, 0.12);
}
.session-preview { display: none; }

/* ===== 通用按钮 ===== */
.ghost {
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid rgba(99, 102, 241, 0.6);
  background: transparent;
  color: var(--text-ghost);
  cursor: pointer;
  font-size: 13px;
  white-space: nowrap;
  transition: background 0.15s, color 0.15s;
}
.ghost:hover { background: rgba(99,102,241,0.15); }

/* 主题切换按钮 */
.theme-btn { margin-left: auto; }

.mobile-menu-btn,
.links-drawer-close {
  display: none;
}

.voice-input-btn {
  display: none;
  touch-action: none;
}

.app-header-main {
  flex: 1;
  min-width: 0;
}

.app-header-actions {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.sidebar-backdrop,
.links-backdrop {
  display: none;
}

.rightbar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.links-drawer-close {
  width: 32px;
  height: 32px;
  padding: 0;
  font-size: 14px;
}
.clear-current-btn {
  position: absolute;
  top: 28px;
  right: 28px;
  z-index: 2;
  padding: 4px 7px;
  min-width: 30px;
  color: var(--text-sub);
  line-height: 1;
}

/* ===== 中间主区域 ===== */
.main {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

.app-header {
  padding: 14px 24px;
  border-bottom: 1px solid var(--border-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-shrink: 0;
}

.app-header h2 { font-size: 20px; font-weight: 600; }
.app-header .sub { font-size: 12px; color: var(--text-sub); }

.chat-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
  overflow: hidden;
  min-height: 0;
  position: relative;
}

.chat-window {
  flex: 1;
  min-height: 0;
  background: var(--bg-chat);
  border-radius: 12px;
  padding: 48px 16px 16px 16px;
  overflow-y: auto;
  overflow-x: hidden;
  border: 1px solid var(--border);
  transition: background 0.3s;
}

.chat-window::-webkit-scrollbar { width: 8px; }
.chat-window::-webkit-scrollbar-track  { background: var(--scrollbar-track); border-radius: 4px; }
.chat-window::-webkit-scrollbar-thumb  { background: var(--scrollbar-thumb); border-radius: 4px; }
.chat-window::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-hover); }

/* ===== 消息气泡 ===== */
.message { margin-bottom: 14px; display: flex; gap: 10px; }
.message.user { justify-content: flex-end; }
.message.ai   { justify-content: flex-start; }

.bubble {
  max-width: 70%;
  padding: 10px 14px;
  border-radius: 10px;
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
  position: relative;
  transition: background 0.3s, border-color 0.3s;
}

.message.user .bubble {
  background: linear-gradient(135deg, #6366f1, #0ea5e9);
  color: #fff;
  border-bottom-right-radius: 2px;
}

.message.ai .bubble {
  background: var(--bg-bubble-ai);
  border: 1px solid var(--border-bubble);
  color: var(--text-main);
  border-bottom-left-radius: 2px;
}

.bubble img {
  max-width: 100%;
  border-radius: 8px;
  margin-top: 6px;
  display: block;
}

.bubble img.inline-image {
  cursor: zoom-in;
  max-width: 400px;
  width: auto;
  height: auto;
  margin-top: 8px;
  margin-bottom: 4px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  display: block;
}

.bubble a {
  color: var(--text-link);
  text-decoration: underline;
  word-break: break-all;
}

.role-tag {
  font-size: 11px;
  color: var(--text-sub);
  margin: 0 4px;
  white-space: nowrap;
  align-self: flex-end;
}

/* ===== 粘贴图片预览 ===== */
.paste-preview {
  position: relative;
  display: inline-flex;
  align-items: flex-start;
  gap: 0;
  margin-bottom: 6px;
}

.paste-preview img {
  max-height: 120px;
  max-width: 220px;
  border-radius: 8px;
  border: 2px solid rgba(99, 102, 241, 0.6);
  object-fit: cover;
  display: block;
}

.paste-clear {
  position: absolute;
  top: -8px;
  right: -8px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: none;
  background: #ef4444;
  color: #fff;
  font-size: 11px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  padding: 0;
}

.paste-clear:hover { background: #dc2626; }

/* ===== 输入区 ===== */
.input-panel {
  flex-shrink: 0;
  border-top: 1px solid var(--border-header);
  padding-top: 10px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.input-row textarea {
  width: 100%;
  resize: none;
  border-radius: 8px;
  border: 1px solid var(--border-input);
  padding: 8px 10px 54px 10px;
  min-height: 120px;
  background: var(--bg-textarea);
  color: var(--text-main);
  outline: none;
  font-size: 15px;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s, border-color 0.15s;
}

.input-row textarea:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 1px rgba(79,70,229,0.7);
}

.input-row textarea::placeholder { color: var(--text-sub); }

.input-row {
  position: relative;
}

.upload-trigger {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid var(--border-input);
  border-radius: 8px;
  background: transparent;
  color: var(--text-main);
  cursor: pointer;
  font-size: 22px;
  font-weight: 500;
  font-family: inherit;
  line-height: 1;
  touch-action: manipulation;
}

.upload-trigger:hover {
  background: rgba(148, 163, 184, 0.12);
}

.upload-icon {
  font-size: 24px;
  line-height: 1;
}

#file-input {
  display: none;
}

.voice-input-btn {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--border-input);
  border-radius: 8px;
  background: transparent;
  color: var(--text-main);
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.voice-input-btn.recording {
  background: rgba(239, 68, 68, 0.12);
  border-color: #ef4444;
  color: #ef4444;
}

.input-actions {
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

#send-btn {
  padding: 8px 14px;
  border-radius: 6px;
  border: 1px solid #1d4ed8;
  cursor: pointer;
  background: #2563eb;
  color: #ffffff;
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: none;
  transition: background 0.15s, border-color 0.15s;
}

#send-btn:hover {
  background: #1d4ed8;
  border-color: #1e40af;
}

#send-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

#send-btn::after { content: '➤'; font-size: 12px; }

/* ===== 右侧链接栏 ===== */
.rightbar {
  background: var(--bg-rightbar);
  border-left: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 12px;
  overflow: hidden;
  transition: background 0.3s;
}

.rightbar-header { font-size: 15px; font-weight: 700; color: var(--text-main); }

.link-list {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.link-item a {
  display: block;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg-link-item);
  color: var(--text-main);
  text-decoration: none;
  transition: border-color 0.15s, background 0.15s;
}
.link-item a:hover { border-color: rgba(99,102,241,0.8); }

/* ===== 命中资料 ===== */
.refs {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--border-header);
}

.refs-title { font-size: 13px; color: var(--text-sub); margin-bottom: 6px; }

.refs a {
  display: block;
  font-size: 13px;
  padding: 6px 8px;
  border-radius: 8px;
  border: 1px solid var(--border-refs);
  background: var(--bg-refs-a);
  margin-bottom: 6px;
  color: var(--text-link);
  text-decoration: none;
  transition: background 0.15s, border-color 0.15s;
}
.refs a:hover { background: var(--bg-refs-a-hov); border-color: rgba(99,102,241,0.7); }

/* ===== 等待动画 ===== */
.typing { display: inline-flex; align-items: center; gap: 4px; color: var(--text-sub); font-size: 13px; }
.dots   { display: inline-flex; gap: 4px; }

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--text-sub);
  animation: bounce 1.2s infinite ease-in-out;
}
.dot:nth-child(2) { animation-delay: 0.15s; }
.dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 80%, 100% { transform: translateY(0); opacity: 0.6; }
  40% { transform: translateY(-5px); opacity: 1; }
}

/* ===== 图片预览弹窗 ===== */
.image-modal {
  position: fixed;
  inset: 0;
  background: var(--modal-bg);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.image-modal.open { display: flex; }
.image-modal img {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 12px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  background: var(--modal-img-bg);
}

/* ===== H5 移动端自适应 ===== */
@media (max-width: 768px) {
  :root {
    --topbar-h: 52px;
  }

  .top-title-text {
    font-size: 15px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: calc(100vw - 88px);
  }

  .top-logo {
    width: 28px;
    height: 28px;
    flex-shrink: 0;
  }

  .app-body,
  .app.no-rightbar .app-body,
  .app.sidebar-collapsed .app-body,
  .app.sidebar-collapsed.no-rightbar .app-body {
    grid-template-columns: 1fr !important;
    position: relative;
  }

  .sidebar {
    position: fixed;
    top: calc(var(--topbar-h) + var(--safe-top));
    left: 0;
    bottom: 0;
    width: min(88vw, 300px);
    z-index: 920;
    transform: translateX(-105%);
    transition: transform 0.25s ease;
    box-shadow: 8px 0 24px rgba(15, 23, 42, 0.18);
    padding-bottom: calc(12px + var(--safe-bottom));
    border-right: 1px solid var(--border);
  }

  .app.sidebar-mobile-open .sidebar {
    transform: translateX(0);
  }

  .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    z-index: 910;
    background: rgba(15, 23, 42, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }

  .app.sidebar-mobile-open .sidebar-backdrop {
    opacity: 1;
    pointer-events: auto;
  }

  .app.sidebar-collapsed .brand,
  .app.sidebar-collapsed .sidebar-actions,
  .app.sidebar-collapsed .session-list {
    display: flex;
  }

  .app.sidebar-collapsed .session-title {
    display: block;
  }

  .new-session-icon-btn {
    display: none !important;
  }

  .sidebar-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }

  .rightbar,
  .links-backdrop {
    display: none !important;
  }

  .mobile-menu-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    min-height: 40px;
    padding: 8px;
  }

  .voice-input-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    min-height: 40px;
  }

  .theme-btn {
    margin-left: 0;
    min-height: 40px;
  }

  .app-header {
    padding: 10px 12px;
    padding-left: calc(12px + var(--safe-left));
    padding-right: calc(12px + var(--safe-right));
    gap: 8px;
  }

  .app-header h2 {
    font-size: 17px;
  }

  .chat-container {
    padding: 10px;
    padding-left: calc(10px + var(--safe-left));
    padding-right: calc(10px + var(--safe-right));
    padding-bottom: calc(10px + var(--safe-bottom));
    gap: 8px;
  }

  .chat-window {
    padding: 40px 10px 10px;
    border-radius: 10px;
  }

  .clear-current-btn {
    top: 18px;
    right: 18px;
    min-width: 40px;
    min-height: 40px;
    padding: 8px;
    font-size: 16px;
  }

  .bubble {
    max-width: 88%;
    font-size: 15px;
    padding: 10px 12px;
  }

  .bubble img.inline-image {
    max-width: 100%;
  }

  .session-title {
    max-width: 9em;
  }

  .session-actions {
    opacity: 1;
  }

  .session-action-btn {
    width: 32px;
    height: 32px;
    font-size: 13px;
  }

  .ghost,
  .new-session-btn,
  .clear-sessions-btn,
  #send-btn,
  .upload-trigger,
  .voice-input-btn {
    min-height: 40px;
  }

  .input-row textarea {
    min-height: 96px;
    font-size: 16px;
    padding-bottom: 56px;
  }

  .input-actions {
    right: 8px;
    bottom: 8px;
  }

  #send-btn {
    padding: 8px 12px;
  }

  .upload-trigger {
    width: 40px;
  }

  .sidebar-toggle-btn {
    width: 40px;
    height: 36px;
  }
}

@media (max-width: 380px) {
  .top-title-text {
    font-size: 14px;
    max-width: calc(100vw - 72px);
  }
}