/* Material Design 3 风格，明暗双主题 */
:root, [data-theme="light"] {
  --topbar-h: 64px;
  --md-primary: #6750a4;
  --md-on-primary: #ffffff;
  --md-primary-container: #eaddff;
  --md-on-primary-container: #21005d;
  --md-secondary-container: #e8def8;
  --md-on-secondary-container: #1d192b;
  --md-surface: #fef7ff;
  --md-surface-container: #f3edf7;
  --md-surface-high: #ece6f0;
  --md-on-surface: #1d1b20;
  --md-on-surface-var: #49454f;
  --md-outline: #79747e;
  --md-outline-var: #cac4d0;
  --md-error: #b3261e;
  --md-error-container: #f9dedc;
  --md-ok: #146c2e;
  --md-shadow: 0 1px 3px rgba(0,0,0,.15), 0 4px 12px rgba(0,0,0,.08);
}
[data-theme="dark"] {
  --md-primary: #d0bcff;
  --md-on-primary: #381e72;
  --md-primary-container: #4f378b;
  --md-on-primary-container: #eaddff;
  --md-secondary-container: #4a4458;
  --md-on-secondary-container: #e8def8;
  --md-surface: #141218;
  --md-surface-container: #211f26;
  --md-surface-high: #2b2930;
  --md-on-surface: #e6e0e9;
  --md-on-surface-var: #cac4d0;
  --md-outline: #938f99;
  --md-outline-var: #49454f;
  --md-error: #f2b8b5;
  --md-error-container: #8c1d18;
  --md-ok: #6dd58c;
  --md-shadow: 0 1px 3px rgba(0,0,0,.4), 0 4px 12px rgba(0,0,0,.3);
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--md-surface); color: var(--md-on-surface);
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  font-size: 15px; line-height: 1.5;
}
a { color: var(--md-primary); text-decoration: none; }

/* 顶栏 */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--md-surface-container); }
.topbar-inner { display: flex; align-items: center; gap: 16px; max-width: 1200px; margin: 0 auto; padding: 8px 16px; }
.brand { font-weight: 700; font-size: 20px; color: var(--md-primary); white-space: nowrap; flex: none; }
.nav {
  display: flex; gap: 4px; flex: 1 1 auto; min-width: 0; flex-wrap: nowrap;
  overflow-x: auto; scrollbar-width: none;
}
.nav::-webkit-scrollbar { display: none; }
.nav-item { padding: 8px 14px; border-radius: 999px; color: var(--md-on-surface-var); white-space: nowrap; flex: none; }
.nav-item.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); font-weight: 600; }
.topbar-right { display: flex; align-items: center; gap: 8px; flex: none; margin-left: auto; }
.topbar .btn, .topbar .icon-btn { flex: none; white-space: nowrap; }
.user-chip { font-size: 13px; color: var(--md-on-surface-var); white-space: nowrap; }

/* 组件 */
.page { max-width: 1200px; margin: 0 auto; padding: 16px; }
.card {
  background: var(--md-surface-container); border-radius: 16px; padding: 16px;
  margin: 8px 0; box-shadow: var(--md-shadow);
}
.card.outlined { box-shadow: none; border: 1px solid var(--md-outline-var); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: none; border-radius: 999px; padding: 8px 18px; cursor: pointer;
  font-size: 14px; font-weight: 600; background: transparent; color: var(--md-primary);
}
.btn:hover { filter: brightness(1.05); }
.btn.filled { background: var(--md-primary); color: var(--md-on-primary); }
.btn.tonal { background: var(--md-secondary-container); color: var(--md-on-secondary-container); }
.btn.danger { color: var(--md-error); }
.btn.filled.danger { background: var(--md-error); color: var(--md-on-primary); }
.btn.text { padding: 8px 12px; }
.btn.large { padding: 12px 24px; font-size: 16px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .5; cursor: default; }
.icon-btn { background: none; border: none; font-size: 18px; cursor: pointer; border-radius: 999px; padding: 6px; }
.field { display: flex; flex-direction: column; gap: 4px; margin: 8px 0; }
.field > span { font-size: 12px; color: var(--md-on-surface-var); }
.field.inline { flex-direction: row; align-items: center; gap: 8px; }
input, select, textarea, fieldset {
  background: var(--md-surface-high); color: var(--md-on-surface);
  border: 1px solid var(--md-outline-var); border-radius: 12px;
  padding: 10px 12px; font: inherit; outline: none; width: 100%;
}
fieldset { border-radius: 12px; border: 1px solid var(--md-outline-var); }
input:focus, select:focus, textarea:focus { border-color: var(--md-primary); }
textarea { resize: vertical; }
.check { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.check input { width: auto; }
.form { display: flex; flex-direction: column; }
.btn-row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin: 8px 0; }
.inline-form { display: inline-flex; gap: 6px; align-items: center; }
.inline-form input, .inline-form select { width: auto; padding: 6px 10px; }
.snackbar {
  border-radius: 12px; padding: 10px 16px; margin: 8px 0; font-size: 14px;
  background: var(--md-surface-high);
}
.snackbar.ok { background: color-mix(in srgb, var(--md-ok) 18%, var(--md-surface-container)); color: var(--md-ok); }
.snackbar.error { background: var(--md-error-container); color: var(--md-error); }
.hint { font-size: 13px; color: var(--md-on-surface-var); }
.headline { font-size: 26px; font-weight: 600; margin: 12px 0 4px; }
.title-medium { font-size: 17px; font-weight: 600; margin: 8px 0; }
.title { font-weight: 600; }
.sub { font-size: 13px; color: var(--md-on-surface-var); }
.big-num { font-size: 28px; font-weight: 700; margin: 4px 0; }
.tag { display: inline-block; border-radius: 8px; padding: 1px 8px; font-size: 12px; background: var(--md-surface-high); }
.tag.ok { color: var(--md-ok); }
.tag.danger { background: var(--md-error-container); color: var(--md-error); }
.pos { color: var(--md-ok); } .neg { color: var(--md-error); }
.mono { font-family: ui-monospace, monospace; }
.small { font-size: 12px; }
.plain-list { padding-left: 18px; margin: 8px 0; }

/* 网格与表格 */
.grid { display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); margin: 12px 0; }
.cards-3 { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.cards-4 { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
.two-col { display: grid; gap: 16px; grid-template-columns: minmax(300px, 5fr) minmax(300px, 7fr); align-items: start; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--md-outline-var); font-size: 14px; vertical-align: top; }
.table th { color: var(--md-on-surface-var); font-weight: 600; }
.stat-card .big-num { color: var(--md-primary); }
.search-bar { display: flex; gap: 8px; margin: 8px 0; max-width: 480px; }
.pager { justify-content: center; }

/* 人设卡片 */
.persona-head { display: flex; gap: 12px; align-items: center; }
.avatar {
  width: 44px; height: 44px; border-radius: 999px; display: flex; align-items: center; justify-content: center;
  background: var(--md-primary-container); font-size: 22px; flex: none;
}
.persona-greeting { font-size: 14px; color: var(--md-on-surface-var); min-height: 40px; }
.persona-actions { display: flex; gap: 8px; }
.word-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.word-chip {
  display: inline-flex; align-items: center; gap: 4px; background: var(--md-surface-high);
  border-radius: 999px; padding: 4px 6px 4px 12px; font-size: 13px;
}
.word-chip .x { border: none; background: none; cursor: pointer; color: var(--md-error); font-size: 14px; }
.log-item { border-bottom: 1px solid var(--md-outline-var); padding: 8px 0; }
.log-q, .log-a { font-size: 13px; margin: 2px 0; }
.log-a { color: var(--md-on-surface-var); }
.tabs { margin-bottom: 8px; }

/* 站点公告（MD3 secondary container） */
.announce {
  display: flex; align-items: flex-start; gap: 12px;
  background: var(--md-secondary-container); color: var(--md-on-secondary-container);
  border-radius: 16px; padding: 14px 16px; margin: 4px 0 12px;
}
.announce-icon { font-size: 20px; line-height: 1.4; flex: none; }
.announce-body { min-width: 0; flex: 1 1 auto; }
.announce-title { font-weight: 600; font-size: 15px; }
.announce-content { font-size: 14px; margin-top: 2px; word-break: break-word; }
.announce-close { flex: none; color: inherit; margin: -4px -6px -4px 0; }

/* 认证页 */
.auth-card { max-width: 380px; margin: 60px auto; }

/* 聊天 */
.chat-shell {
  position: relative;
  display: grid; grid-template-columns: 280px minmax(0, 1fr); gap: 12px;
  height: calc(100dvh - var(--topbar-h, 64px) - 32px);
}
.chat-side {
  display: flex; flex-direction: column; gap: 8px; min-height: 0;
  background: var(--md-surface-container); border-radius: 16px; padding: 12px;
  overflow: hidden;
}
.chat-side-head { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.chat-side-title { font-size: 13px; font-weight: 600; color: var(--md-on-surface-var); padding-left: 4px; }
.side-close { display: none; }
.conv-list {
  flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain;
  display: flex; flex-direction: column; gap: 4px;
}
.side-nav { display: flex; flex-direction: column; gap: 2px; flex: none; padding-top: 6px; border-top: 1px solid var(--md-outline-var); }
.side-link { display: block; padding: 9px 12px; border-radius: 12px; color: var(--md-on-surface-var); font-size: 14px; }
.side-link:hover { background: var(--md-surface-high); }
.conv-item {
  display: flex; align-items: center; gap: 6px;
  padding: 9px 8px 9px 12px; border-radius: 12px; cursor: pointer;
}
.conv-item:hover { background: var(--md-surface-high); }
.conv-item.active { background: var(--md-secondary-container); color: var(--md-on-secondary-container); font-weight: 600; }
.conv-item.draft { cursor: default; }
.conv-main { display: flex; flex-direction: column; min-width: 0; flex: 1 1 auto; }
.conv-title { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv-time { font-size: 11px; font-weight: 400; color: var(--md-on-surface-var); }
.conv-ops { display: flex; gap: 2px; flex: none; }
.conv-op {
  display: none; align-items: center; justify-content: center;
  width: 28px; height: 28px; border: none; border-radius: 999px; padding: 0;
  background: none; color: var(--md-on-surface-var); font-size: 13px; cursor: pointer;
}
.conv-item:hover .conv-op, .conv-item.active .conv-op { display: flex; }
.conv-op:hover { background: var(--md-surface); color: var(--md-primary); }
.conv-op.danger:hover { color: var(--md-error); }
@media (hover: none) { .conv-op { display: flex; } }

.chat-main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.chat-toolbar { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding: 10px 14px; margin: 0; flex: none; }
.chat-toolbar .field.inline { margin: 0; }
.chat-toolbar .field.inline select { width: auto; max-width: 260px; }
.toolbar-actions { display: flex; gap: 4px; align-items: center; margin-left: auto; }
.drawer-btn { display: none; }
.quota-bar {
  display: flex; gap: 8px; flex-wrap: wrap; padding: 4px 8px; flex: none;
  overflow-x: auto; scrollbar-width: none;
}
.quota-bar::-webkit-scrollbar { display: none; }
.chip { background: var(--md-surface-high); border-radius: 999px; padding: 3px 12px; font-size: 12px; color: var(--md-on-surface-var); flex: none; }
.messages {
  flex: 1 1 auto; min-height: 0; overflow-y: auto; overscroll-behavior: contain;
  padding: 12px 4px; display: flex; flex-direction: column; gap: 12px;
}
.messages:empty::before {
  content: attr(data-empty); margin: auto; padding: 24px; text-align: center;
  color: var(--md-on-surface-var); font-size: 14px;
}
.msg { max-width: 80%; padding: 10px 16px; border-radius: 18px; white-space: pre-wrap; word-break: break-word; font-size: 15px; }
.msg.user { align-self: flex-end; background: var(--md-primary); color: var(--md-on-primary); border-bottom-right-radius: 6px; }
.msg.assistant { align-self: flex-start; background: var(--md-surface-container); box-shadow: var(--md-shadow); border-bottom-left-radius: 6px; }
.msg.error { color: var(--md-error); }
.msg .cursor { display: inline-block; width: 8px; height: 16px; background: var(--md-primary); animation: blink 1s steps(1) infinite; vertical-align: text-bottom; }
@keyframes blink { 50% { opacity: 0; } }
.chat-input { display: flex; gap: 8px; align-items: flex-end; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); margin: 8px 0 0; flex: none; }
.chat-input textarea { flex: 1 1 auto; min-width: 0; resize: none; max-height: 40vh; }
.chat-input .btn { flex: none; }
.chat-scrim { display: none; }

/* 聊天页窄屏：隐藏站点顶栏，全屏对话（AI 客户端布局） */
@media (max-width: 800px) {
  .chat-page .topbar { display: none; }
  .chat-page .page { padding: 0; max-width: none; }
  .chat-shell { grid-template-columns: minmax(0, 1fr); gap: 0; height: 100dvh; }
  .chat-side {
    position: fixed; z-index: 60; top: 0; bottom: 0; left: 0;
    width: min(84vw, 320px); padding: 12px; border-radius: 0 16px 16px 0;
    padding-top: calc(12px + env(safe-area-inset-top));
    padding-bottom: calc(12px + env(safe-area-inset-bottom));
    box-shadow: 0 0 24px rgba(0, 0, 0, .28);
    transform: translateX(-105%); visibility: hidden; transition: transform .22s ease, visibility .22s;
  }
  .chat-side.open { transform: none; visibility: visible; }
  .side-close { display: inline-flex; align-items: center; justify-content: center; }
  .chat-scrim {
    display: block; position: fixed; z-index: 55; top: 0; right: 0; bottom: 0; left: 0;
    background: rgba(0, 0, 0, .45); opacity: 0; visibility: hidden; transition: opacity .2s ease, visibility .2s;
  }
  .chat-scrim.show { opacity: 1; visibility: visible; }
  .drawer-btn { display: inline-flex; align-items: center; justify-content: center; flex: none; }
  .chat-toolbar { gap: 6px; padding: 8px; border-radius: 14px; flex-wrap: nowrap; }
  .chat-toolbar .field.inline { flex: 1 1 0; min-width: 0; gap: 0; }
  .chat-toolbar .field.inline > span { display: none; }
  .chat-toolbar .field.inline select { width: 100%; padding: 9px 8px; font-size: 14px; }
  .toolbar-actions { margin-left: 0; flex: none; }
  .toolbar-actions .btn { padding: 8px 6px; font-size: 13px; }
  .quota-bar { flex-wrap: nowrap; padding: 4px 2px; }
  .messages { padding: 8px 2px; }
  .msg { max-width: 90%; font-size: 15px; }
  .chat-input { padding: 8px; gap: 6px; }
  .chat-input textarea { font-size: 16px; }
}


/* 后台布局 */
.admin-shell { display: grid; grid-template-columns: 220px 1fr; min-height: 100vh; }
@media (max-width: 800px) { .admin-shell { grid-template-columns: 1fr; } }
.admin-side {
  background: var(--md-surface-container); padding: 16px 10px; display: flex; flex-direction: column;
}
.admin-side .brand { margin-bottom: 16px; }
.admin-side nav { display: flex; flex-direction: column; gap: 2px; }
.admin-main { padding: 8px 20px 40px; min-width: 0; }
.side-foot { margin-top: auto; }

/* 后台窄屏：侧栏改为顶部横向导航 */
@media (max-width: 800px) {
  .admin-side { flex-direction: row; flex-wrap: wrap; align-items: center; gap: 8px; padding: 10px 12px; }
  .admin-side .brand { margin-bottom: 0; }
  .admin-side nav { flex-direction: row; flex-wrap: wrap; gap: 2px; }
  .side-foot { margin-top: 0; }
  .admin-main { padding: 8px 12px 32px; }
}

/* 移动端适配：顶栏保持单行，导航横向滚动，高度与聊天页同步 */
@media (max-width: 800px) {
  :root { --topbar-h: 60px; }
  .topbar-inner { flex-wrap: nowrap; gap: 8px; padding: 8px 12px; }
  .brand { font-size: 17px; }
  .nav { gap: 2px; padding-bottom: 2px; }
  .nav-item { padding: 6px 10px; font-size: 13px; }
  .user-chip { display: none; }
  .topbar .btn.text { padding: 6px 10px; font-size: 13px; }
  .table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }
}
@media (max-width: 700px) {
  body { font-size: 14px; }
  .page { padding: 12px 12px 20px; }
  .quota-bar { padding: 4px 2px; }
  .chat-input { padding: 8px; gap: 6px; }
  .chat-input .btn { flex: none; }
  .msg { max-width: 90%; }
  .headline { font-size: 22px; }
  .auth-card { margin: 28px auto; }
}