:root {
  --bg: #f6f7f9;
  --panel: #ffffff;
  --panel-2: #f1f3f6;
  --border: #e2e5ea;
  --text: #1d2330;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --accent-soft: #e8efff;
  --danger: #dc2626;
  --ok: #16a34a;
  --warn: #d97706;
  --user-bubble: #2563eb;
  --user-text: #ffffff;
  --code-bg: #f3f4f6;
  --shadow: 0 6px 24px rgba(15, 23, 42, .12);
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1218;
    --panel: #171b23;
    --panel-2: #1e232d;
    --border: #2a303c;
    --text: #e6e8ec;
    --muted: #9aa3b2;
    --accent: #5b8cff;
    --accent-text: #0b1020;
    --accent-soft: #1d2a45;
    --danger: #f87171;
    --ok: #4ade80;
    --warn: #fbbf24;
    --user-bubble: #3b6ef0;
    --user-text: #ffffff;
    --code-bg: #11151c;
    --shadow: 0 6px 24px rgba(0, 0, 0, .5);
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}
button, input, select, textarea { font: inherit; color: inherit; }
[hidden] { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 13px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
  border: 1px solid var(--border); background: var(--panel); border-radius: 8px;
  padding: 7px 14px; cursor: pointer; text-decoration: none; white-space: nowrap;
}
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.btn.danger { color: var(--danger); }
.btn.ghost { background: transparent; border-color: transparent; }
.btn.ghost:hover { background: var(--panel-2); }
.btn.small { padding: 4px 10px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: default; }

/* 登录 / 改密码 */
.center-view { min-height: 100%; display: grid; place-items: center; padding: 16px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); }
.auth-card { width: min(380px, 100%); padding: 28px; display: grid; gap: 14px; }
.auth-card h1 { margin: 0; font-size: 22px; }
.auth-card p { margin: 0; }
.auth-card label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }
.auth-card input, .dlg input {
  width: 100%; padding: 9px 11px; border: 1px solid var(--border); border-radius: 8px; background: var(--bg);
}
.form-error { color: var(--danger); margin: 0; font-size: 14px; }
.row-btns { display: flex; gap: 8px; justify-content: flex-end; }

/* 主界面 */
#mainView { height: 100%; display: flex; flex-direction: column; }
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 8px 16px;
  background: var(--panel); border-bottom: 1px solid var(--border); flex: 0 0 auto;
}
.brand { font-weight: 600; }
.status { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.dot { width: 9px; height: 9px; border-radius: 50%; background: var(--muted); }
.dot.ok { background: var(--ok); }
.dot.busy { background: var(--warn); }
.dot.down { background: var(--danger); }
.quota { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--muted); margin-left: auto; }
.quota-bar { width: 90px; height: 6px; background: var(--panel-2); border-radius: 3px; overflow: hidden; }
#quotaFill { height: 100%; width: 0; background: var(--accent); }
.user-menu { position: relative; }
.menu {
  position: absolute; right: 0; top: calc(100% + 4px); z-index: 30; min-width: 140px;
  background: var(--panel); border: 1px solid var(--border); border-radius: 8px; box-shadow: var(--shadow);
  padding: 4px; display: grid;
}
.menu button { text-align: left; padding: 8px 12px; border: 0; background: none; border-radius: 6px; cursor: pointer; }
.menu button:hover { background: var(--panel-2); }
.menu button.danger { color: var(--danger); }

.layout { flex: 1 1 auto; display: grid; grid-template-columns: minmax(280px, 38%) 1fr; min-height: 0; }
.pane { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.files-pane { border-right: 1px solid var(--border); background: var(--panel); }
.pane-head {
  display: flex; align-items: center; gap: 8px; padding: 10px 12px; border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
.tools { display: flex; gap: 4px; flex-wrap: wrap; margin-left: auto; }
.crumbs { display: flex; flex-wrap: wrap; gap: 2px; align-items: center; font-size: 14px; min-width: 0; }
.crumbs button { border: 0; background: none; padding: 2px 4px; border-radius: 4px; cursor: pointer; color: var(--accent); }
.crumbs span { color: var(--muted); }

.file-list { flex: 1 1 auto; overflow: auto; position: relative; padding: 4px 0; outline: none; }
.file-list.dragover { background: var(--accent-soft); }
.drop-hint { display: none; position: absolute; inset: 12px; border: 2px dashed var(--accent); border-radius: 12px;
  place-items: center; color: var(--accent); pointer-events: none; }
.file-list.dragover .drop-hint { display: grid; }
.frow {
  display: grid; grid-template-columns: 28px 1fr auto auto 32px; gap: 8px; align-items: center;
  padding: 6px 12px; cursor: pointer; border-radius: 6px; margin: 0 4px;
}
.frow:hover { background: var(--panel-2); }
.frow .ico { font-size: 18px; text-align: center; }
.frow .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.frow .meta { font-size: 12px; color: var(--muted); white-space: nowrap; }
.frow .more { border: 0; background: none; cursor: pointer; border-radius: 6px; padding: 2px 6px; color: var(--muted); }
.frow .more:hover { background: var(--border); }
.frow.new .name::after { content: "新"; font-size: 11px; color: var(--accent-text); background: var(--accent);
  padding: 0 5px; border-radius: 8px; margin-left: 6px; }
.empty-dir { padding: 24px; text-align: center; color: var(--muted); }

.uploads { border-top: 1px solid var(--border); max-height: 30%; overflow: auto; }
.uploads:empty { display: none; }
.up { padding: 6px 12px; font-size: 13px; display: grid; gap: 4px; }
.up .bar { height: 4px; background: var(--panel-2); border-radius: 2px; overflow: hidden; }
.up .bar div { height: 100%; width: 0; background: var(--accent); transition: width .2s; }
.up.err { color: var(--danger); }

/* 对话 */
.chat-pane { background: var(--bg); }
.chat-pane .pane-head { background: var(--panel); }
.conv-title { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.messages { flex: 1 1 auto; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 14px; }
.empty-chat { margin: auto; text-align: center; max-width: 460px; }
.empty-chat h2 { margin: 0 0 6px; font-size: 20px; }
.examples { display: grid; gap: 8px; margin-top: 10px; }
.example { border: 1px solid var(--border); background: var(--panel); border-radius: 10px; padding: 10px 12px; cursor: pointer; text-align: left; }
.example:hover { border-color: var(--accent); }

.msg { max-width: min(860px, 100%); }
.msg.user { align-self: flex-end; background: var(--user-bubble); color: var(--user-text);
  padding: 9px 14px; border-radius: 14px 14px 4px 14px; white-space: pre-wrap; word-break: break-word; }
.msg.assistant { align-self: stretch; display: grid; gap: 8px; }
.msg .md { background: var(--panel); border: 1px solid var(--border); border-radius: 4px 14px 14px 14px; padding: 10px 14px;
  overflow-wrap: anywhere; }
.msg .md:empty { display: none; }
.md p { margin: .4em 0; }
.md pre { background: var(--code-bg); padding: 10px; border-radius: 8px; overflow: auto; font-size: 13px; }
.md code { background: var(--code-bg); padding: 1px 4px; border-radius: 4px; font-size: 13px; }
.md pre code { padding: 0; background: none; }
.md table { border-collapse: collapse; display: block; overflow: auto; max-width: 100%; }
.md th, .md td { border: 1px solid var(--border); padding: 4px 8px; }
.md h1, .md h2, .md h3 { margin: .6em 0 .3em; line-height: 1.3; }
.md h1 { font-size: 1.3em; } .md h2 { font-size: 1.15em; } .md h3 { font-size: 1.05em; }
.md ul, .md ol { padding-left: 1.4em; }
.md a { color: var(--accent); }
details.think { font-size: 13px; color: var(--muted); background: var(--panel-2); border-radius: 8px; padding: 6px 10px; }
details.think summary { cursor: pointer; }
details.think div { white-space: pre-wrap; margin-top: 6px; max-height: 320px; overflow: auto; }
.tool { font-size: 13px; background: var(--panel); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; }
.tool summary { cursor: pointer; display: flex; gap: 8px; align-items: center; list-style: none; }
.tool summary::-webkit-details-marker { display: none; }
.tool .st { width: 16px; text-align: center; }
.tool .st.run::before { content: ""; display: inline-block; width: 11px; height: 11px; border: 2px solid var(--accent);
  border-right-color: transparent; border-radius: 50%; animation: spin .8s linear infinite; }
.tool .st.ok::before { content: "✓"; color: var(--ok); }
.tool .st.bad::before { content: "✗"; color: var(--danger); }
.tool .sum { color: var(--muted); margin-left: auto; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 45%; }
.tool pre { white-space: pre-wrap; word-break: break-word; max-height: 260px; overflow: auto; background: var(--code-bg);
  padding: 8px; border-radius: 6px; margin: 6px 0 0; font-size: 12px; }
@keyframes spin { to { transform: rotate(360deg); } }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { border: 1px solid var(--accent); color: var(--accent); background: var(--accent-soft); border-radius: 14px;
  padding: 2px 10px; font-size: 13px; cursor: pointer; }
.notice { font-size: 13px; color: var(--muted); padding: 4px 2px; }
.notice.err { color: var(--danger); }
.typing::after { content: "▍"; animation: blink 1s steps(2) infinite; color: var(--accent); }
@keyframes blink { 50% { opacity: 0; } }

.queue-banner { margin: 0 16px; padding: 6px 12px; font-size: 13px; background: var(--accent-soft); color: var(--accent);
  border-radius: 8px; }
.composer { padding: 10px 16px 14px; display: grid; gap: 6px; }
.composer textarea { width: 100%; resize: none; border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px;
  background: var(--panel); max-height: 40vh; }
.composer textarea:focus { outline: 2px solid var(--accent-soft); border-color: var(--accent); }
.composer-row { display: flex; align-items: center; gap: 10px; justify-content: flex-end; }
.think { font-size: 13px; color: var(--muted); display: flex; gap: 6px; align-items: center; }
.think select { border: 1px solid var(--border); border-radius: 6px; padding: 3px 6px; background: var(--panel); }
#sendBtn.stop { background: var(--danger); border-color: var(--danger); color: #fff; }

/* 抽屉、对话框 */
.drawer { position: fixed; z-index: 40; top: 0; bottom: 0; right: 0; width: min(340px, 90vw); background: var(--panel);
  border-left: 1px solid var(--border); box-shadow: var(--shadow); display: flex; flex-direction: column; }
.drawer-head { display: flex; justify-content: space-between; align-items: center; padding: 12px; border-bottom: 1px solid var(--border); }
.conv-list { overflow: auto; padding: 6px; }
.citem { display: grid; grid-template-columns: 1fr auto; gap: 4px; align-items: center; padding: 8px 10px; border-radius: 8px; cursor: pointer; }
.citem:hover, .citem.active { background: var(--panel-2); }
.citem .t { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.citem .d { font-size: 12px; color: var(--muted); }
.citem .acts { display: flex; gap: 2px; }
.citem .acts button { border: 0; background: none; color: var(--muted); cursor: pointer; padding: 2px 6px; border-radius: 4px; font-size: 12px; }
.citem .acts button:hover { background: var(--border); }

.dlg { border: 1px solid var(--border); border-radius: 14px; padding: 0; background: var(--panel); color: var(--text);
  box-shadow: var(--shadow); width: min(560px, calc(100vw - 32px)); max-height: calc(100vh - 48px); }
.dlg.wide { width: min(1000px, calc(100vw - 32px)); height: calc(100vh - 48px); }
.dlg.narrow { width: min(400px, calc(100vw - 32px)); }
.dlg::backdrop { background: rgba(0, 0, 0, .35); }
.dlg[open] { display: flex; flex-direction: column; }
.dlg-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.dlg-head strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dlg-head > div { display: flex; gap: 6px; }
.dlg-body { flex: 1 1 auto; overflow: auto; padding: 14px; }
.dlg form { padding: 16px; display: grid; gap: 12px; }
.dlg form p { margin: 0; }
#trashHint { margin: 8px 14px 0; }
.preview-text { white-space: pre-wrap; word-break: break-word; font-size: 14px; margin: 0; }
.preview-img { max-width: 100%; display: block; margin: auto; }
.preview-pdf { width: 100%; height: 100%; border: 0; min-height: 70vh; }
.ptable { border-collapse: collapse; font-size: 13px; }
.ptable td, .ptable th { border: 1px solid var(--border); padding: 3px 6px; white-space: nowrap; max-width: 260px; overflow: hidden; text-overflow: ellipsis; }
.ptable tr:first-child td { font-weight: 600; background: var(--panel-2); }
.sheet-tabs { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 8px; }
.sheet-tabs button.active { border-color: var(--accent); color: var(--accent); }
.titem { display: grid; grid-template-columns: 1fr auto; gap: 8px; align-items: center; padding: 8px 4px; border-bottom: 1px solid var(--border); }
.titem .p { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.titem .d { font-size: 12px; color: var(--muted); }

.file-menu { position: fixed; }
.toast { position: fixed; left: 50%; bottom: 80px; transform: translateX(-50%); background: var(--text); color: var(--bg);
  padding: 8px 16px; border-radius: 8px; z-index: 60; max-width: calc(100vw - 32px); font-size: 14px; }

.mobile-tabs { display: none; }
@media (max-width: 768px) {
  .topbar { gap: 10px; padding: 8px 12px; }
  .brand { font-size: 15px; }
  .quota-bar { width: 50px; }
  .status span:last-child { display: none; }
  .layout { grid-template-columns: 1fr; }
  .files-pane { border-right: 0; }
  .layout[data-tab="chat"] .files-pane, .layout[data-tab="files"] .chat-pane { display: none; }
  .mobile-tabs { display: flex; border-top: 1px solid var(--border); background: var(--panel); flex: 0 0 auto;
    padding-bottom: env(safe-area-inset-bottom); }
  .mobile-tabs button { flex: 1; padding: 10px; border: 0; background: none; color: var(--muted); }
  .mobile-tabs button.active { color: var(--accent); font-weight: 600; }
  .messages { padding: 12px; }
  .composer { padding: 8px 12px 10px; }
  .frow { grid-template-columns: 24px 1fr auto 28px; }
  .frow .meta.time { display: none; }
}