/* ================================================================ 基础 */
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0; height: 100%;
  background: var(--color-bg); color: var(--color-text);
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 15px; line-height: 1.6;
}
button { font-family: inherit; }
a { color: inherit; text-decoration: none; }

/* ================================================================ 应用外壳
   桌面:侧边栏 + (顶栏 / 消息区 / 输入区) 的 Grid;
   移动端:侧边栏离屏成抽屉。全部由 CSS 断点驱动,无 JS 宽度判断。 */
.app-shell {
  display: grid;
  height: 100dvh;
  grid-template-columns: var(--sidebar-w) 1fr;
  grid-template-rows: var(--topbar-h) 1fr auto;
  grid-template-areas:
    "sidebar topbar"
    "sidebar main"
    "sidebar composer";
}
.app-shell.sidebar-collapsed { grid-template-columns: 0 1fr; }
.app-shell.sidebar-collapsed .sidebar { border-right: none; }

/* ================================================================ 侧边栏 */
.sidebar {
  grid-area: sidebar;
  min-width: 0; overflow: hidden;
  display: flex; flex-direction: column;
  background: var(--color-panel);
  border-right: 1px solid var(--color-border);
}
.sidebar-head { padding: 14px 14px 10px; flex-shrink: 0; }
.sidebar-brand {
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; margin-bottom: 12px; white-space: nowrap;
}
.sidebar-brand .text-btn { margin-left: auto; }
.new-chat-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 14px; border-radius: var(--radius);
  background: var(--color-primary); color: #fff; font-weight: 500;
  transition: background 0.2s;
}
.new-chat-btn:hover { background: var(--color-primary-strong); }
.conv-list { flex: 1; overflow-y: auto; padding: 6px 8px 16px; }
.conv-item {
  display: flex; align-items: center; gap: 2px;
  padding: 0 4px 0 0; border-radius: 8px;
  border-left: 3px solid transparent; margin-bottom: 2px;
  transition: background 0.15s;
}
.conv-item:hover { background: var(--color-panel-2); }
.conv-item.active {
  background: var(--color-primary-weak);
  border-left-color: var(--color-primary);
}
.conv-link { flex: 1; min-width: 0; display: block; padding: 9px 4px 9px 10px; }
.conv-fav {
  flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border: none; border-radius: 6px;
  background: transparent; color: var(--color-text-muted);
  cursor: pointer; opacity: 0; transition: opacity 0.15s, color 0.15s;
}
.conv-item:hover .conv-fav, .conv-item.active .conv-fav { opacity: 1; }
.conv-fav:hover { color: var(--color-primary); }
@media (hover: none) { .conv-fav { opacity: 0.6; } }
.conv-title {
  display: block; font-size: 14px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.conv-time { display: block; font-size: 12px; color: var(--color-text-muted); margin-top: 2px; }
.sidebar-overlay { display: none; }

/* ================================================================ 顶栏 */
.topbar {
  grid-area: topbar;
  display: flex; align-items: center; gap: 10px;
  padding: 0 14px;
  background: var(--color-panel);
  border-bottom: 1px solid var(--color-border);
}
.model-select {
  height: 34px; min-width: 150px; max-width: 220px;
  padding: 0 8px; border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-panel-2); color: var(--color-text);
  font-size: 14px;
}
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 4px; }
.style-select {
  height: 30px; padding: 0 6px; margin-right: 4px;
  border: 1px solid var(--color-border); border-radius: 8px;
  background: var(--color-panel-2); color: var(--color-text-muted);
  font-size: 12px;
}

/* ================================================================ 通用控件 */
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 8px;
  border: none; background: transparent; color: var(--color-text-muted);
  cursor: pointer; transition: background 0.15s, color 0.15s;
}
.icon-btn:hover { background: var(--color-panel-2); color: var(--color-primary); }
.text-btn {
  border: none; background: transparent; color: var(--color-primary);
  font-size: 13px; cursor: pointer; padding: 4px 8px; border-radius: 6px;
}
.text-btn:hover { background: var(--color-primary-weak); }
.chip {
  font-size: 11px; padding: 1px 7px; border-radius: 999px;
  background: var(--color-primary-weak); color: var(--color-primary);
  vertical-align: middle;
}
.empty-state {
  text-align: center; color: var(--color-text-muted);
  padding: 32px 16px; font-size: 14px;
}

/* ================================================================ 消息区 */
.chat-main { grid-area: main; overflow-y: auto; scroll-behavior: smooth; }
.message-list, .welcome {
  max-width: var(--content-max);
  margin: 0 auto; padding: 18px 16px 8px;
}
.msg-group {
  margin-bottom: 26px;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  box-shadow: var(--shadow-1);
}
.msg-meta {
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; color: var(--color-text-muted); margin-bottom: 8px;
}
.msg-actions { display: flex; gap: 2px; }
.msg-actions .icon-btn { width: 26px; height: 26px; }

/* 收起状态:回答隐藏,问题压成单行预览 */
.msg-collapse-btn svg { transition: transform 0.2s ease; }
.msg-group.collapsed .msg-collapse-btn svg { transform: rotate(180deg); }
.msg-group.collapsed .bubble-assistant,
.msg-group.collapsed .attachment-row { display: none; }
.msg-group.collapsed .bubble-user { margin-bottom: 0; padding: 6px 14px; }
.msg-group.collapsed .bubble-user .bubble-text {
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  color: var(--color-text-muted); font-size: 14px;
}
.msg-group.collapsed .msg-meta { margin-bottom: 6px; }
.bubble { border-radius: var(--radius); padding: 10px 14px; }
.bubble-user {
  background: var(--bubble-user);
  margin-bottom: 10px;
}
.bubble-user .bubble-text { white-space: pre-wrap; word-break: break-word; }
.bubble-assistant { background: var(--bubble-assistant); padding: 4px 2px; }
.bubble-error {
  background: var(--bubble-error); color: var(--bubble-error-text);
  font-size: 14px;
}
.attachment-row { margin-top: 8px; display: flex; flex-wrap: wrap; gap: 6px; }
.attachment-chip {
  font-size: 12px; padding: 3px 10px; border-radius: 999px;
  background: var(--color-panel-2); color: var(--color-text-muted);
}
.attachment-chip:hover { color: var(--color-primary); }
.reasoning {
  border-left: 3px solid var(--color-border);
  padding-left: 10px; margin-bottom: 10px;
  color: var(--color-text-muted); font-size: 14px;
}
.reasoning summary { cursor: pointer; font-size: 13px; user-select: none; }

/* Markdown 渲染结果:默认"简洁排版"。
   规则用 :not(.markdown-body) 限定,切到第三方排版时交给对应样式库 */
.md { word-break: break-word; overflow-wrap: anywhere; text-align: left; }

/* 简洁排版的文字节奏:行高 1.8、段落与列表留足呼吸感(对齐旧版观感) */
.md:not(.markdown-body) { font-size: 15px; line-height: 1.8; }
.md:not(.markdown-body) p { margin: 12px 0; }
.md:not(.markdown-body) ul, .md:not(.markdown-body) ol { margin: 12px 0; padding-left: 1.7em; }
.md:not(.markdown-body) li { margin: 7px 0; }
.md:not(.markdown-body) li > p { margin: 4px 0; }
.md:not(.markdown-body) h1 { font-size: 1.5em; margin: 22px 0 12px; line-height: 1.4; }
.md:not(.markdown-body) h2 { font-size: 1.3em; margin: 20px 0 10px; line-height: 1.4; }
.md:not(.markdown-body) h3 { font-size: 1.15em; margin: 16px 0 8px; line-height: 1.4; }
.md:not(.markdown-body) h4 { font-size: 1.05em; margin: 14px 0 6px; }
.md:not(.markdown-body) hr {
  border: none; border-top: 1px solid var(--color-border); margin: 18px 0;
}
.md:not(.markdown-body) pre {
  overflow-x: auto; padding: 0; margin: 10px 0;
  background: none; font-size: 13px;
}
.md:not(.markdown-body) pre code {
  display: block; padding: 12px 14px; border-radius: 8px;
  background: var(--color-panel-2);
}
.md code { font-family: Consolas, "Courier New", monospace; }
.md:not(.markdown-body) :not(pre) > code {
  background: var(--color-panel-2); padding: 1px 6px; border-radius: 4px; font-size: 13px;
}
.md:not(.markdown-body) table { border-collapse: collapse; max-width: 100%; display: block; overflow-x: auto; }
.md:not(.markdown-body) th, .md:not(.markdown-body) td { border: 1px solid var(--color-border); padding: 6px 10px; }
.md img { max-width: 100%; }
.md .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }
.md:not(.markdown-body) blockquote {
  margin: 8px 0; padding: 2px 12px;
  border-left: 3px solid var(--color-primary); color: var(--color-text-muted);
}
/* 第三方排版嵌在气泡里:去掉自带底色,跟随面板背景 */
.md.markdown-body { background: transparent; }
/* 掘金系主题按浅色底设计,暗色主题下正文颜色强制跟随主题变量保证可读,
   标题/强调色仍由各主题自己决定 */
:root[data-theme="dark"] .md.markdown-body,
:root[data-theme="dark"] .md.markdown-body p,
:root[data-theme="dark"] .md.markdown-body li {
  color: var(--color-text);
}

/* 代码块复制按钮(悬停浮现,定位在 .code-wrap 上避免随代码横向滚动) */
.code-wrap { position: relative; }
.code-copy-btn {
  position: absolute; top: 8px; right: 8px;
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; font-size: 12px; border-radius: 6px;
  border: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-panel) 82%, transparent);
  backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px);
  color: var(--color-text-muted); cursor: pointer;
  opacity: 0; transition: opacity 0.15s, color 0.15s;
}
.code-wrap:hover .code-copy-btn, .code-copy-btn:focus-visible { opacity: 1; }
.code-copy-btn:hover { color: var(--color-primary); }
.code-copy-btn.copied { color: var(--color-primary); opacity: 1; }
@media (hover: none) { .code-copy-btn { opacity: 0.65; } }

/* 欢迎页(无消息时) */
.welcome { text-align: center; padding-top: 6vh; }
.welcome-title { margin: 0 0 6px; font-size: 22px; }
.welcome-sub { color: var(--color-text-muted); margin: 0 0 24px; font-size: 14px; }
.model-grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
}
.model-card {
  text-align: left; padding: 14px; border-radius: var(--radius);
  border: 1px solid var(--color-border); background: var(--color-panel);
  cursor: pointer; transition: border-color 0.15s, box-shadow 0.15s;
  color: var(--color-text);
}
.model-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-1); }
.model-card.selected { border-color: var(--color-primary); background: var(--color-primary-weak); }
.model-card-name { display: block; font-weight: 600; margin-bottom: 4px; }
.model-card-desc { display: block; font-size: 13px; color: var(--color-text-muted); }

/* 等待模型响应指示 */
.pending-bubble {
  display: none;
  max-width: var(--content-max); margin: 0 auto 16px; padding: 0 16px;
  color: var(--color-text-muted); font-size: 14px;
  align-items: center; gap: 8px;
}
.pending-bubble.htmx-request, .pending-bubble.active { display: flex; }
.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid var(--color-primary-weak);
  border-top-color: var(--color-primary);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ================================================================ 输入区 */
.composer {
  grid-area: composer;
  padding: 10px 16px calc(14px + env(safe-area-inset-bottom));
  background: var(--color-bg);
}
.composer form {
  display: flex; align-items: flex-end; gap: 8px;
  max-width: var(--content-max); margin: 0 auto;
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: 14px; padding: 8px 10px;
  box-shadow: var(--shadow-1);
}
.composer form:focus-within { border-color: var(--color-primary); }
#chat-input {
  flex: 1; resize: none; border: none; outline: none;
  background: transparent; color: var(--color-text);
  font-family: inherit; font-size: 15px; line-height: 1.5;
  max-height: 220px; padding: 6px 2px;
}
.send-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px; border: none;
  background: var(--color-primary); color: #fff; cursor: pointer;
  transition: background 0.2s;
}
.send-btn:hover { background: var(--color-primary-strong); }
.send-btn:disabled { opacity: 0.5; cursor: not-allowed; }
form.htmx-request .send-btn, form.sending .send-btn { opacity: 0.5; pointer-events: none; }
.attach-preview {
  max-width: var(--content-max); margin: 0 auto;
  display: flex; flex-wrap: wrap; gap: 6px;
}
.attach-preview:not(:empty) { padding-bottom: 8px; }
.attach-item {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 13px; padding: 3px 10px; border-radius: 999px;
  background: var(--color-primary-weak); color: var(--color-text);
}
.attach-item button {
  border: none; background: none; cursor: pointer;
  color: var(--color-text-muted); padding: 0 2px;
}
.attach-item button:hover { color: var(--bubble-error-text); }

/* ================================================================ 抽屉 */
.drawer-backdrop {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.4);
  opacity: 0; pointer-events: none; transition: opacity 0.2s; z-index: 115;
}
.drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(92vw, 400px); z-index: 120;
  background: var(--color-panel);
  box-shadow: var(--shadow-2);
  transform: translateX(100%); transition: transform 0.25s ease;
  display: flex; flex-direction: column;
}
body.drawer-open .drawer-backdrop { opacity: 1; pointer-events: auto; }
.drawer.open { transform: none; }
.drawer-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; border-bottom: 1px solid var(--color-border);
}
.drawer-head h3 { margin: 0; font-size: 16px; }
.drawer-body { flex: 1; overflow-y: auto; }
.drawer-tools { padding: 12px 14px 0; }
.drawer-search { display: flex; gap: 6px; }
.drawer-search input {
  flex: 1; min-width: 0; height: 32px; padding: 0 10px;
  border: 1px solid var(--color-border); border-radius: 8px;
  background: var(--color-panel-2); color: var(--color-text); font-size: 13px;
}
.drawer-search input[type="date"] { flex: 0 0 auto; width: 130px; }
.drawer-list { padding: 8px; }
.drawer-item {
  display: flex; align-items: center; gap: 4px;
  padding: 8px 6px 8px 10px; border-radius: 8px;
}
.drawer-item:hover { background: var(--color-panel-2); }
.drawer-item-main { flex: 1; min-width: 0; }
.drawer-pager {
  display: flex; justify-content: center; gap: 12px; padding: 8px 0 16px;
}

/* ================================================================ 登录页 / 个人中心 */
.auth-page {
  min-height: 100dvh; display: flex; align-items: center; justify-content: center;
  padding: 24px 16px;
}
.auth-card {
  width: 100%; max-width: 400px;
  background: var(--color-panel); border: 1px solid var(--color-border);
  border-radius: 16px; padding: 30px 28px; box-shadow: var(--shadow-1);
}
.auth-brand { margin: 0; text-align: center; font-size: 24px; color: var(--color-primary); }
.auth-subtitle { text-align: center; color: var(--color-text-muted); margin: 6px 0 20px; font-size: 14px; }
.auth-tabs {
  display: flex; margin-bottom: 18px;
  border-bottom: 1px solid var(--color-border);
}
.auth-tab {
  flex: 1; text-align: center; padding: 10px 0;
  color: var(--color-text-muted); border-bottom: 2px solid transparent;
}
.auth-tab.active { color: var(--color-primary); border-bottom-color: var(--color-primary); font-weight: 600; }
.auth-form { display: flex; flex-direction: column; gap: 14px; }
.field span { display: block; font-size: 13px; color: var(--color-text-muted); margin-bottom: 5px; }
.field input {
  width: 100%; height: 38px; padding: 0 12px;
  border: 1px solid var(--color-border); border-radius: 8px;
  background: var(--color-panel-2); color: var(--color-text); font-size: 14px;
}
.field input:focus { outline: none; border-color: var(--color-primary); }
.captcha-row { display: flex; gap: 10px; }
.captcha-row input { flex: 1; }
.captcha-row img { height: 38px; border-radius: 8px; cursor: pointer; }
.primary-btn {
  height: 40px; border: none; border-radius: 8px;
  background: var(--color-primary); color: #fff;
  font-size: 15px; font-weight: 500; cursor: pointer;
  transition: background 0.2s;
}
.primary-btn:hover { background: var(--color-primary-strong); }
.auth-error {
  background: var(--bubble-error); color: var(--bubble-error-text);
  border-radius: 8px; padding: 8px 12px; font-size: 13px; margin-bottom: 14px;
}
.auth-ok {
  background: var(--color-primary-weak); color: var(--color-primary);
  border-radius: 8px; padding: 8px 12px; font-size: 13px; margin-bottom: 14px;
}
.member-head { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; }
.member-head .auth-brand { flex: 1; text-align: center; font-size: 20px; }
.member-info { margin-bottom: 18px; }
.member-row {
  display: flex; justify-content: space-between;
  padding: 8px 0; border-bottom: 1px dashed var(--color-border);
  font-size: 14px;
}
.member-row span { color: var(--color-text-muted); }

/* ================================================================ 悬浮滚动导航 */
.scroll-nav {
  position: fixed; right: 18px; bottom: 110px; z-index: 60;
  display: flex; flex-direction: column; gap: 8px;
}
.scroll-nav-btn {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--color-border);
  background: color-mix(in srgb, var(--color-panel) 55%, transparent);
  backdrop-filter: blur(6px); -webkit-backdrop-filter: blur(6px);
  color: var(--color-text-muted); cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  opacity: 0.55; transition: opacity 0.2s, color 0.2s, background 0.2s, transform 0.15s;
  box-shadow: var(--shadow-1);
}
.scroll-nav-btn:hover {
  opacity: 1; color: var(--color-primary);
  background: var(--color-panel); transform: translateY(-1px);
}

/* ================================================================ 滚动条
   参考旧版:4px 细滑块,常态半透明灰,悬停变主题橙。
   注意:scrollbar-width 标准属性只给 Firefox,Chrome 一旦识别它会忽略
   ::-webkit-scrollbar 自定义样式 */
@supports (-moz-appearance: none) {
  .conv-list, .chat-main, .drawer-body {
    scrollbar-width: thin;
    scrollbar-color: rgba(148, 163, 184, 0.35) transparent;
  }
}
.conv-list::-webkit-scrollbar,
.chat-main::-webkit-scrollbar,
.drawer-body::-webkit-scrollbar { width: 4px; }
.conv-list::-webkit-scrollbar-track,
.chat-main::-webkit-scrollbar-track,
.drawer-body::-webkit-scrollbar-track { background: transparent; }
.conv-list::-webkit-scrollbar-thumb,
.chat-main::-webkit-scrollbar-thumb,
.drawer-body::-webkit-scrollbar-thumb {
  background: rgba(148, 163, 184, 0.35);
  border-radius: 2px;
}
.conv-list::-webkit-scrollbar-thumb:hover,
.chat-main::-webkit-scrollbar-thumb:hover,
.drawer-body::-webkit-scrollbar-thumb:hover {
  background: rgba(251, 119, 80, 0.5);
}

.load-earlier { display: flex; justify-content: center; padding: 8px 0 4px; }
.load-earlier-btn {
  padding: 6px 18px; font-size: 13px; border-radius: 16px;
  border: 1px solid var(--color-border); background: var(--color-panel-2);
  color: var(--color-text-muted); cursor: pointer; transition: color 0.15s, border-color 0.15s;
}
.load-earlier-btn:hover { color: var(--color-primary); border-color: var(--color-primary); }
.load-earlier.htmx-request .load-earlier-btn { opacity: 0.6; pointer-events: none; }
.load-earlier.htmx-request .load-earlier-btn::after { content: ' …'; }

/* ================================================================ Toast */
.toast {
  position: fixed; left: 50%; bottom: 90px; transform: translateX(-50%);
  background: var(--color-text); color: var(--color-bg);
  padding: 9px 18px; border-radius: 999px; font-size: 14px;
  box-shadow: var(--shadow-2); z-index: 200;
  animation: toast-in 0.2s ease;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } }

/* ================================================================ 响应式
   平板(≤1024px):侧边栏默认收起,可通过按钮以抽屉形式展开;
   手机(≤640px):进一步压缩间距,消息卡片全宽。 */
@media (max-width: 1024px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-areas: "topbar" "main" "composer";
  }
  .sidebar {
    position: fixed; top: 0; bottom: 0; left: 0;
    width: min(82vw, 300px); z-index: 110;
    transform: translateX(-100%); transition: transform 0.25s ease;
    border-right: 1px solid var(--color-border);
    box-shadow: var(--shadow-2);
  }
  .app-shell.sidebar-open .sidebar { transform: none; }
  .sidebar-overlay {
    display: block; position: fixed; inset: 0; z-index: 105;
    background: rgba(0, 0, 0, 0.4);
    opacity: 0; pointer-events: none; transition: opacity 0.2s;
  }
  .app-shell.sidebar-open .sidebar-overlay { opacity: 1; pointer-events: auto; }
}

@media (max-width: 640px) {
  .message-list, .welcome { padding: 12px 8px 4px; }
  .msg-group { padding: 10px; margin-bottom: 16px; }
  .composer { padding: 8px 8px calc(10px + env(safe-area-inset-bottom)); }
  .model-select { min-width: 110px; font-size: 13px; }
  .topbar { gap: 4px; padding: 0 8px; }
  .drawer { width: 100vw; }
  .model-grid { grid-template-columns: 1fr 1fr; }
  .scroll-nav { right: 10px; bottom: 96px; }
  .scroll-nav-btn { width: 34px; height: 34px; }
  .style-select { display: none; }
}