/* ============================================================
   ===================== 前台精修层 =====================
   设计目标:更高级、更简洁、更强的层次与微交互
   独立于 enhanced.css,放在其后加载,可整体回退
   ============================================================ */

/* ---------- 0. 设计 token 升级 ---------- */
:root, [data-theme="light"] {
  --shadow-soft: 0 1px 2px rgba(0,0,0,0.03), 0 2px 6px rgba(0,0,0,0.035);
  --shadow-float: 0 2px 4px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.07);
  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.5) inset, 0 4px 20px rgba(0,0,0,0.08);
  --bg-elevated: rgba(255,255,255,0.72);
  --bg-mask: rgba(255,255,255,0.68);
}
[data-theme="dark"] {
  --shadow-soft: 0 1px 2px rgba(0,0,0,0.25), 0 2px 8px rgba(0,0,0,0.3);
  --shadow-float: 0 2px 6px rgba(0,0,0,0.35), 0 10px 30px rgba(0,0,0,0.45);
  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.06) inset, 0 4px 24px rgba(0,0,0,0.4);
  --bg-elevated: rgba(32,32,34,0.72);
  --bg-mask: rgba(20,20,22,0.66);
}

/* 更精致的滚动条:默认不可见,悬停容器时淡出 */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: 8px;
}
.chat-list:hover::-webkit-scrollbar-thumb,
.chat-area:hover::-webkit-scrollbar-thumb,
.modal-body:hover::-webkit-scrollbar-thumb {
  background: rgba(128,128,128,0.28);
  border: 2px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(128,128,128,0.42) !important; }

/* 文本选中更贴合主题 */
::selection { background: color-mix(in srgb, var(--accent) 80%, transparent); color: #fff; }

/* ---------- 1. 顶栏:悬浮毛玻璃 + 渐变分隔线 ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  height: 52px;
  padding: 6px 16px;
  background: linear-gradient(to bottom, var(--bg-mask), transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
}
.topbar::after {
  content: "";
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: 0;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--hairline), transparent);
}
.topbar .icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s, transform 0.12s;
}
.topbar .icon-btn:active { transform: scale(0.92); }

/* ---------- 2. 侧边栏:更细腻的层次 ---------- */
.sidebar { background: linear-gradient(180deg, var(--bg-sidebar), rgba(247,247,249,0.92)); }
[data-theme="dark"] .sidebar { background: linear-gradient(180deg, var(--bg-sidebar), rgba(24,24,26,0.94)); }

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 14px 6px;
}
.sidebar-brand .brand-logo {
  transition: opacity 0.2s, transform 0.2s;
  opacity: 0.94;
  flex: 1;
  min-width: 0;
}
.brand-logo:hover { opacity: 1; transform: translateY(-0.5px); }
/* 收起按钮:紧贴 logo 右侧,圆角方形 */
.sidebar-collapse-btn {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--bg-hover);
  color: var(--text-secondary);
  transition: background 0.15s, color 0.15s, transform 0.12s;
}
.sidebar-collapse-btn:hover { background: var(--bg-active); color: var(--text); }
.sidebar-collapse-btn:active { transform: scale(0.92); }

/* 新建对话占满整行,与上方收起按钮行等宽 */
.sidebar-header { padding: 4px 12px 8px; }

/* 新建对话按钮:主色胶囊 + 悬浮上浮 */
.sidebar-header { padding: 4px 12px 8px; }
.sidebar-header .new-chat-btn { width: 100%; }
.new-chat-btn {
  background: var(--primary);
  color: var(--primary-text);
  border-radius: 12px;
  padding: 10px 14px;
  font-weight: 550;
  box-shadow: var(--shadow-soft);
  transition: background 0.18s, box-shadow 0.18s, transform 0.12s;
}
.new-chat-btn:hover {
  background: var(--primary-hover);
  box-shadow: var(--shadow-float);
  transform: translateY(-1px);
}
.new-chat-btn:active { transform: scale(0.98); }

/* 模型胶囊:玻璃质感 + 聚焦蓝点 */
.sidebar-model-wrap { padding: 2px 12px 8px; }
.sidebar-model-wrap .model-picker {
  background: var(--bg-elevated);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-soft);
  border-radius: 12px;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}
.sidebar-model-wrap .model-picker:hover {
  border-color: var(--hairline-strong);
  background: var(--bg-surface);
  box-shadow: var(--shadow-float);
}
.sidebar-model-wrap .model-icon { color: var(--accent); }

/* 搜索框 */
.chat-search {
  margin: 6px 10px 8px;
  padding: 8px 12px;
  border-radius: 10px;
  background: var(--bg-elevated);
  border: 1px solid transparent;
  box-shadow: none;
  transition: border-color 0.15s, background 0.15s;
}
.chat-search:focus-within {
  border-color: var(--hairline-strong);
  background: var(--bg-surface);
}

/* 时间分组标题 */
.chat-group {
  padding: 12px 14px 4px;
  font-size: 10.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  opacity: 0.85;
}

/* 会话项 */
.chat-item {
  border-radius: 10px;
  padding: 8px 11px;
  font-size: 13px;
  transition: background 0.12s, transform 0.08s;
}
.chat-item:active { transform: scale(0.99); }
.chat-item.active {
  background: var(--bg-surface);
  box-shadow: var(--shadow-soft);
  font-weight: 550;
}
.chat-item .chat-title { font-weight: inherit; }

/* 会话项 hover 浮现操作菜单(悬浮胶囊) */
.chat-item-menu {
  position: absolute;
  right: 8px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  gap: 2px;
  padding: 3px;
  background: var(--bg-surface);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: var(--shadow-float);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, transform 0.15s;
  z-index: 5;
}
.chat-item-wrap:hover .chat-item-menu { opacity: 1; pointer-events: auto; }
.chat-item-menu .menu-btn {
  width: 26px;
  height: 26px;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 用户区 */
.sidebar-footer { padding: 8px 10px 12px; }
.user-chip { border-radius: 12px; transition: background 0.15s; }
.user-chip:hover { background: var(--bg-hover); }
.avatar { box-shadow: inset 0 0 0 1px var(--hairline); }
.footer-btn { border-radius: 9px; padding: 7px 8px; font-size: 12.5px; }

/* ---------- 3. 消息区 ---------- */
.messages { max-width: 820px; padding: 28px 28px 12px; }
.msg { padding: 22px 0; }

/* 头像:淡雅底色 + 内描边 */
.msg .msg-avatar {
  background: linear-gradient(135deg, var(--bg-active), var(--bg-hover));
  border: none;
  box-shadow: inset 0 0 0 1px var(--hairline);
  width: 28px;
  height: 28px;
  font-size: 16px;
  margin-top: 4px;
}

/* 用户气泡 */
.msg.user .msg-content {
  border-radius: 18px;
  background: var(--bg-user-msg);
  padding: 10px 16px;
}

/* AI markdown 排版微调 */
.msg.assistant .msg-content { padding-top: 6px; }
.msg.assistant p { margin: 9px 0; }
.msg.assistant h1, .msg.assistant h2, .msg.assistant h3, .msg.assistant h4 {
  letter-spacing: -0.02em;
}

/* ---------- 4. 消息操作栏:hover 优雅浮现 ---------- */
.msg-actions {
  opacity: 0;
  margin-top: 8px;
  gap: 1px;
  padding-left: 40px; /* 对齐头像线 */
  transition: opacity 0.18s;
}
.msg:hover .msg-actions { opacity: 0.72; }
.msg .msg-actions:hover { opacity: 1; }
.msg-action {
  padding: 6px 8px;
  border-radius: 8px;
  transition: background 0.12s, color 0.12s, transform 0.08s;
}
.msg-action:active { transform: scale(0.9); }
.msg-action:hover { background: var(--bg-hover); color: var(--text); }
.msg-action.active { color: var(--accent); }

/* 快捷指令胶囊 */
.quick-actions { gap: 8px; margin-top: 12px; padding-left: 40px; }
.quick-action {
  padding: 6px 14px;
  background: var(--bg-hover);
  border-radius: 999px;
  font-size: 12px;
  transition: all 0.15s;
}
.quick-action:hover {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
  color: var(--accent);
}

/* 跟进建议 */
.follow-ups { margin-top: 18px; padding-left: 0; }

/* 代码块:细边框 + 头部色带 */
.code-block {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.code-header {
  background: var(--bg-surface-2);
  border-bottom: 1px solid var(--hairline);
  padding: 7px 12px;
}

/* ---------- 5. 流式输出 ---------- */
.stream-cursor {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  vertical-align: -0.18em;
  margin-left: 2px;
  border-radius: 1px;
  background: var(--accent);
  animation: ocBlink 1s step-end infinite;
}

/* 阶段指示器柔和化 */
.phase-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 40px;
  margin-bottom: 4px;
  font-size: 12.5px;
  color: var(--text-tertiary);
}
.phase-spinner { width: 13px; height: 13px; }

/* 回复耗时 */
.reply-cost { padding-left: 40px; font-size: 11.5px; }

/* ---------- 6. Composer:悬浮玻璃卡片 + 聚焦光环 ---------- */
.composer-area { padding: 6px 24px 14px; }
.composer-wrap { max-width: 820px; }
.composer {
  border-radius: 22px;
  background: var(--bg-elevated);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-float);
  padding: 8px 8px 8px 18px;
  transition: border-color 0.2s, box-shadow 0.25s, background 0.2s;
}
.composer:focus-within {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  box-shadow: 0 0 0 4px color-mix(in srgb, var(--accent) 12%, transparent), var(--shadow-float);
  background: var(--bg-surface);
}
.composer textarea {
  padding: 7px 2px;
  font-size: 14.5px;
}

/* 发送按钮:主色圆钮 + 悬浮上浮 */
.send-btn {
  background: var(--accent);
  width: 34px;
  height: 34px;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s, background 0.15s;
  opacity: 0.92;
  box-shadow: 0 2px 8px color-mix(in srgb, var(--accent) 35%, transparent);
}
.send-btn:hover { transform: scale(1.06) translateY(-1px); opacity: 1; }
.send-btn:active { transform: scale(0.92); }
.send-btn:disabled { background: var(--bg-active); color: var(--text-tertiary); box-shadow: none; }
.stop-btn { background: var(--text-secondary); }
.stop-btn:hover { background: var(--text); transform: scale(1.05); }

/* 附件/语音按钮:悬停主题色 */
.attach-btn:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }
.voice-btn:hover { color: var(--accent); background: color-mix(in srgb, var(--accent) 10%, transparent); }

.composer-hint { font-size: 11.5px; margin-top: 8px; opacity: 0.85; }

/* ---------- 7. 空状态:logo 瓦片 + 建议卡 hover 提升 ---------- */
.empty-logo {
  width: 76px;
  height: 76px;
  border-radius: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-surface);
  box-shadow: var(--shadow-soft), inset 0 0 0 1px var(--hairline);
  color: var(--accent);
  margin-bottom: 22px;
  transition: transform 0.25s, box-shadow 0.25s;
}
.empty-state:hover .empty-logo {
  transform: translateY(-3px) scale(1.02);
  box-shadow: var(--shadow-float), inset 0 0 0 1px var(--hairline);
}
.empty-state h2 { font-size: 26px; font-weight: 700; letter-spacing: -0.03em; }
.empty-suggest {
  border-radius: 14px;
  padding: 15px 18px;
  font-size: 13px;
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.empty-suggest:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-soft);
  border-color: var(--hairline-strong);
}

/* ---------- 8. 回到底部按钮 ---------- */
.scroll-bottom-btn {
  position: absolute;
  right: 24px;
  bottom: 96px;
  z-index: 30;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--hairline);
  background: var(--bg-surface);
  color: var(--text-secondary);
  box-shadow: var(--shadow-float);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s, color 0.2s;
}
.scroll-bottom-btn.show {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.scroll-bottom-btn:hover {
  color: var(--accent);
  box-shadow: var(--shadow-float), 0 0 0 4px color-mix(in srgb, var(--accent) 10%, transparent);
}
.scroll-bottom-btn:active { transform: translateY(0) scale(0.92); }

/* ---------- 9. 移动端适配精修 ---------- */
@media (max-width: 768px) {
  .topbar { height: 50px; padding: 6px 10px; }
  .messages { padding: 20px 16px 8px; }
  .msg-actions, .quick-actions, .reply-cost { padding-left: 0; }
  .composer-area { padding: 4px 12px 10px; }
  .scroll-bottom-btn { right: 14px; bottom: 88px; }
  .empty-logo { width: 64px; height: 64px; }
}
/* chat-area 作为回到底部按钮的定位父级 */
.chat-area { position: relative; scroll-behavior: smooth; }

/* 发送按钮:空输入时的柔和降级(配合 JS disabled 态) */
.send-btn.muted,
.send-btn:disabled:not(.hidden) {
  background: var(--bg-active);
  color: var(--text-tertiary);
  box-shadow: none;
  opacity: 1;
}
.send-btn.muted:hover,
.send-btn:disabled:hover {
  transform: none;
  opacity: 1;
}

/* 折叠后的展开按钮:对齐 logo 行高度(侧边栏品牌区) */
.sidebar-float-btn {
  top: 14px;
  left: 12px;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  border: 1px solid var(--hairline);
  background: var(--bg-surface);
  box-shadow: var(--shadow-float);
}

/* ---------- 10. 消息操作栏:耗时最右 + 追问在按钮下方 ---------- */
.msg-actions {
  align-items: center;
  gap: 1px;
}
/* 耗时推进操作栏最右 */
.msg-actions .reply-cost {
  margin-left: auto;
  padding-left: 10px;
  font-size: 11.5px;
  color: var(--text-tertiary);
  flex-shrink: 0;
}
/* 消息内其它位置(兜底)的耗时也靠右 */
.msg > .reply-cost {
  padding-left: 40px;
  font-size: 11.5px;
}

/* 相关追问:位于操作栏按钮下方,留足上间距 */
.follow-ups {
  margin-top: 14px;
  margin-bottom: 4px;
  padding-top: 12px;
}
.msg-actions + .follow-ups,
.msg > .msg-actions ~ .follow-ups {
  margin-top: 18px;
}
.follow-ups-label {
  font-size: 11.5px;
  letter-spacing: 0.04em;
}

/* 移动端:不使用折叠浮钮(用汉堡抽屉),避免与展开按钮冲突 */
@media (max-width: 768px) {
  .sidebar-float-btn { display: none !important; }
}

/* ---------- 11. 登录/注册页:与主界面同一设计语言 ---------- */
.auth-body {
  background:
    radial-gradient(1200px 600px at 20% -10%, color-mix(in srgb, var(--accent) 8%, transparent), transparent 60%),
    radial-gradient(1000px 500px at 110% 110%, color-mix(in srgb, var(--accent) 6%, transparent), transparent 55%),
    var(--bg-app);
}
.auth-card {
  border-radius: 24px;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-float);
  background: var(--bg-surface);
}
.auth-logo .logo-wrap {
  width: 64px;
  height: 64px;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), color-mix(in srgb, var(--primary) 60%, var(--accent)));
  box-shadow: var(--shadow-float);
  transition: transform 0.2s;
}
.auth-logo .logo-wrap:hover { transform: translateY(-2px) scale(1.02); }
.auth-card input {
  background: var(--bg-hover) !important;
  border-radius: 12px !important;
}
.auth-card input:focus {
  background: var(--bg-surface) !important;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent) !important;
}
.auth-card .btn.primary {
  background: var(--accent);
  box-shadow: 0 2px 10px color-mix(in srgb, var(--accent) 30%, transparent);
  transition: transform 0.12s, box-shadow 0.15s, background 0.15s;
}
.auth-card .btn.primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, #000 12%);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 40%, transparent);
  transform: translateY(-1px);
}
.auth-card .btn.primary:active { transform: scale(0.98); }
.auth-switch a { text-decoration: none; font-weight: 600; }

/* ---------- 12. 设置弹窗:更顺滑的进出场 ---------- */
.modal { will-change: transform, opacity; }
.modal-mask { transition: opacity 0.18s ease; }
.modal-mask:not(.show) { opacity: 0; }
.modal-mask .modal { transition: transform 0.22s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.18s ease; }
.modal-mask:not(.show) .modal {
  transform: translateY(14px) scale(0.97);
  opacity: 0;
}
.modal-mask.show { opacity: 1; animation: fadeIn 0.18s ease; }
.modal-mask.show .modal { animation: modalIn 0.22s cubic-bezier(0.2, 0.8, 0.2, 1); }

/* ---------- 13. 消息间距呼吸感 ---------- */
.msg { padding: 26px 0; }
.msg:first-child { padding-top: 14px; }
.msg+.msg { border-top: 1px solid var(--hairline); margin-top: 4px; }
.msg.user { padding: 20px 0; }

/* 让 AI 回复内容更透气 */
.msg.assistant .msg-content { line-height: 1.75; }
.msg.assistant p { margin: 10px 0; }
.msg.assistant li { margin: 6px 0; }

/* ---------- 14. Toast 托盘:堆叠 + 优雅进出 ---------- */
.toast-host {
  position: fixed;
  bottom: 28px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 3000;
  pointer-events: none;
}
.toast {
  position: static;
  transform: none;
  margin: 0;
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0;
  pointer-events: auto;
  animation: toastIn2 0.22s cubic-bezier(0.2, 0.8, 0.2, 1);
  transition: opacity 0.24s ease, transform 0.24s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.toast.out {
  opacity: 0;
  transform: translateY(8px);
}
@keyframes toastIn2 {
  from { opacity: 0; transform: translateY(12px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

/* ---------- 15. 登录按钮加载态 ---------- */
.auth-card .btn.primary:disabled {
  background: var(--bg-active);
  color: var(--text-tertiary);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}
.auth-card .btn.primary:disabled::after {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 8px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  vertical-align: -1px;
  animation: ocSpin 0.7s linear infinite;
}
@keyframes ocSpin { to { transform: rotate(360deg); } }

/* ---------- 16. 设置供应商卡片 hover 细节 ---------- */
.provider-card {
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}
.provider-card:hover {
  box-shadow: var(--shadow-soft);
}
.provider-card:active { transform: scale(0.995); }

/* 下拉菜单项 hover 更细腻 */
.oc-menu-item { transition: background 0.1s, transform 0.05s; }
.oc-menu-item:active { transform: scale(0.99); }

/* ---------- 17. 侧边栏:可拖拽调宽 + 折叠按钮居左 ---------- */
:root {
  --sidebar-w: 264px;
  --sidebar-w-min: 200px;
  --sidebar-w-max: 480px;
}
.sidebar {
  width: var(--sidebar-w);
  min-width: var(--sidebar-w);
  transition: margin-left 0.25s cubic-bezier(0.4, 0, 0.2, 1), width 0s;
}
/* 拖拽时不显示过渡,避免拖拽滞后 */
.sidebar.resizing { transition: none; }

/** 折叠按钮居右:logo 在左,按钮靠右 */
.sidebar-brand {
  justify-content: space-between;
  align-items: center;
}
.sidebar-brand .brand-logo {
  order: 0;
  flex: 1;
  min-width: 0;
}
.sidebar-collapse-btn {
  order: 1;
  flex-shrink: 0;
  margin-left: 8px;
}

/* 拖拽手柄:侧边栏右边缘竖线,悬停高亮 */
.sidebar-resizer {
  position: absolute;
  top: 0;
  right: -3px;
  width: 7px;
  height: 100%;
  cursor: col-resize;
  z-index: 45;
  transition: background 0.15s;
}
.sidebar-resizer::after {
  content: "";
  position: absolute;
  top: 0;
  right: 2px;
  width: 1px;
  height: 100%;
  background: var(--hairline);
  transition: background 0.15s, width 0.15s, box-shadow 0.15s;
}
.sidebar-resizer:hover::after,
.sidebar-resizer.active::after {
  background: var(--accent);
  width: 3px;
  right: 1px;
  box-shadow: 0 0 6px color-mix(in srgb, var(--accent) 40%, transparent);
}
/* 拖拽时的全局光标与禁止选中 */
body.sidebar-resizing {
  cursor: col-resize !important;
  user-select: none !important;
  -webkit-user-select: none !important;
}
body.sidebar-resizing * { cursor: col-resize !important; }

/* 移动端:禁用拖拽手柄 */
@media (max-width: 768px) {
  .sidebar-resizer { display: none; }
  .sidebar { width: 264px; min-width: 264px; }
}