:root {
  --bg: #f6f7f9; --panel: #ffffff; --panel-2: #f0f2f5; --border: #e2e5ea; --text: #1b1f24; --muted: #667080;
  --accent: #5b5bd6; --accent-2: #4747b8; --accent-soft: #ececfb; --danger: #d64545; --danger-soft: #fdecec;
  --ok: #1f8a5b; --ok-soft: #e6f5ee; --warn: #b7791f; --warn-soft: #fdf4e3;
  --user-bubble: #ececfb; --code-bg: #f3f4f7; --shadow: 0 1px 2px rgba(16,24,40,.06), 0 4px 16px rgba(16,24,40,.06);
  --radius: 12px; --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317; --panel: #181b20; --panel-2: #1f232a; --border: #2b3038; --text: #e6e8eb; --muted: #9099a6;
    --accent: #8b8bf0; --accent-2: #a3a3f5; --accent-soft: #24253d; --danger: #ef6b6b; --danger-soft: #3a1f22;
    --ok: #4cc38a; --ok-soft: #173126; --warn: #e0a84a; --warn-soft: #362a15;
    --user-bubble: #262842; --code-bg: #1d2127; --shadow: 0 1px 2px rgba(0,0,0,.3), 0 4px 16px rgba(0,0,0,.25);
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.6 var(--font); -webkit-font-smoothing: antialiased; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
.hidden { display: none !important; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; border: 1px solid var(--border); background: var(--panel); border-radius: 9px; padding: 7px 14px; font-weight: 500; transition: background .15s, border-color .15s; white-space: nowrap; }
.btn:hover { background: var(--panel-2); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn.danger { color: var(--danger); }
.btn.danger.solid { background: var(--danger); border-color: var(--danger); color: #fff; }
.btn.small { padding: 4px 10px; font-size: 13px; border-radius: 7px; }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--panel-2); }
.input, select.input, textarea.input { width: 100%; border: 1px solid var(--border); background: var(--panel); border-radius: 9px; padding: 9px 12px; outline: none; transition: border-color .15s, box-shadow .15s; }
.input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
label.field { display: block; margin-bottom: 14px; }
label.field > span { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: var(--muted); }
.hint { font-size: 12.5px; color: var(--muted); margin-top: 4px; }
.notice { border-radius: 9px; padding: 10px 12px; font-size: 14px; margin-bottom: 14px; }
.notice.error { background: var(--danger-soft); color: var(--danger); }
.notice.ok { background: var(--ok-soft); color: var(--ok); }
.notice.warn { background: var(--warn-soft); color: var(--warn); }
.logo { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; font-size: 18px; letter-spacing: .2px; }
.logo-mark { width: 30px; height: 30px; border-radius: 9px; background: linear-gradient(135deg, var(--accent), #b26be0); display: grid; place-items: center; color: #fff; font-size: 16px; }

/* ---------- auth ---------- */
.auth-wrap { min-height: 100%; display: grid; place-items: center; padding: 32px 16px; }
.auth-card { width: 100%; max-width: 400px; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; padding: 30px 28px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 21px; margin: 18px 0 4px; }
.auth-card .sub { color: var(--muted); margin: 0 0 22px; font-size: 14px; }
.auth-card .btn.primary { width: 100%; padding: 10px; margin-top: 4px; }
.auth-links { margin-top: 18px; display: flex; justify-content: space-between; font-size: 14px; flex-wrap: wrap; gap: 8px; }

/* ---------- app layout ---------- */
.app { display: grid; grid-template-columns: 272px 1fr; height: 100vh; height: 100dvh; }
.sidebar { background: var(--panel); border-right: 1px solid var(--border); display: flex; flex-direction: column; min-height: 0; }
.sidebar-head { padding: 14px 14px 10px; display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.sidebar .new-chat { margin: 0 12px 10px; }
.session-list { flex: 1; overflow-y: auto; padding: 0 8px 8px; }
.session-group { font-size: 12px; color: var(--muted); font-weight: 600; padding: 12px 8px 4px; }
.session-item { display: flex; align-items: center; gap: 6px; width: 100%; border: 0; background: transparent; text-align: left; padding: 8px 10px; border-radius: 8px; color: var(--text); }
.session-item:hover { background: var(--panel-2); }
.session-item.active { background: var(--accent-soft); }
.session-item .title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: 14px; }
.session-item .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); flex: none; animation: pulse 1.2s infinite; }
.session-empty { color: var(--muted); font-size: 13px; padding: 16px 10px; }
.sidebar-foot { border-top: 1px solid var(--border); padding: 10px 12px; display: flex; align-items: center; gap: 8px; }
.avatar { width: 30px; height: 30px; border-radius: 50%; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; font-weight: 700; flex: none; text-transform: uppercase; }
.me { flex: 1; min-width: 0; font-size: 14px; }
.me .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.me .email { color: var(--muted); font-size: 12px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.menu { position: relative; }
.menu-pop { position: absolute; bottom: 42px; right: 0; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); padding: 5px; min-width: 150px; z-index: 20; }
.menu-pop button, .menu-pop a { display: block; width: 100%; text-align: left; border: 0; background: transparent; padding: 7px 10px; border-radius: 7px; font-size: 14px; color: var(--text); }
.menu-pop button:hover, .menu-pop a:hover { background: var(--panel-2); text-decoration: none; }

.main { display: flex; flex-direction: column; min-width: 0; min-height: 0; }
.topbar { display: flex; align-items: center; gap: 10px; padding: 10px 18px; border-bottom: 1px solid var(--border); background: var(--panel); min-height: 56px; }
.topbar .chat-title { flex: 1; min-width: 0; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.topbar select { width: auto; padding: 5px 10px; font-size: 13px; }
.menu-toggle { display: none; }
.status-pill { font-size: 12px; color: var(--muted); display: inline-flex; align-items: center; gap: 5px; }
.status-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--muted); }
.status-pill.on::before { background: var(--ok); }
.status-pill.busy::before { background: var(--warn); animation: pulse 1.2s infinite; }

.messages { flex: 1; overflow-y: auto; padding: 24px 18px 12px; scroll-behavior: smooth; }
.thread { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 18px; }
.msg { display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.msg.user { align-items: flex-end; }
.msg.user .bubble { background: var(--user-bubble); border-radius: 16px 16px 4px 16px; padding: 9px 14px; max-width: 85%; white-space: pre-wrap; word-wrap: break-word; }
.msg.assistant .content { min-width: 0; overflow-wrap: anywhere; }
.content > :first-child { margin-top: 0; } .content > :last-child { margin-bottom: 0; }
.content p { margin: .55em 0; }
.content pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 9px; padding: 11px 13px; overflow-x: auto; font: 13px/1.5 var(--mono); }
.content code { font: 13px var(--mono); background: var(--code-bg); padding: 1px 5px; border-radius: 5px; }
.content pre code { background: none; padding: 0; }
.content table { border-collapse: collapse; display: block; overflow-x: auto; margin: .6em 0; }
.content th, .content td { border: 1px solid var(--border); padding: 5px 10px; }
.content th { background: var(--panel-2); }
.content img { max-width: 100%; border-radius: 8px; }
.content blockquote { margin: .6em 0; padding: 2px 12px; border-left: 3px solid var(--border); color: var(--muted); }
.content h1, .content h2, .content h3 { line-height: 1.3; margin: 1em 0 .4em; }
.content h1 { font-size: 1.35em; } .content h2 { font-size: 1.2em; } .content h3 { font-size: 1.05em; }

.tool { border: 1px solid var(--border); border-radius: 10px; background: var(--panel); font-size: 13.5px; }
.tool > summary { list-style: none; display: flex; align-items: center; gap: 8px; padding: 7px 11px; cursor: pointer; user-select: none; }
.tool > summary::-webkit-details-marker { display: none; }
.tool .tool-icon { width: 18px; height: 18px; border-radius: 5px; display: grid; place-items: center; font-size: 11px; background: var(--panel-2); flex: none; }
.tool.running .tool-icon { background: var(--warn-soft); color: var(--warn); }
.tool.done .tool-icon { background: var(--ok-soft); color: var(--ok); }
.tool.failed .tool-icon { background: var(--danger-soft); color: var(--danger); }
.tool .tool-name { font-weight: 600; font-family: var(--mono); font-size: 12.5px; }
.tool .tool-preview { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; font-family: var(--mono); font-size: 12.5px; }
.tool-body { border-top: 1px solid var(--border); padding: 8px 11px; }
.tool-body pre { margin: 0 0 6px; white-space: pre-wrap; word-break: break-word; max-height: 320px; overflow: auto; font: 12.5px/1.5 var(--mono); background: var(--code-bg); border-radius: 7px; padding: 8px 10px; }
.tool-body .label { font-size: 11.5px; color: var(--muted); font-weight: 600; margin: 4px 0 3px; }
.thinking { color: var(--muted); font-size: 13.5px; display: inline-flex; align-items: center; gap: 8px; }
.thinking::before { content: ""; width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--border); border-top-color: var(--accent); animation: spin .8s linear infinite; }
.approval { border: 1px solid var(--warn); background: var(--warn-soft); border-radius: 10px; padding: 11px 13px; font-size: 14px; }
.approval pre { background: var(--panel); border-radius: 7px; padding: 8px 10px; white-space: pre-wrap; word-break: break-word; font: 12.5px var(--mono); margin: 7px 0 9px; }
.approval .actions { display: flex; gap: 6px; flex-wrap: wrap; }
.run-error { color: var(--danger); background: var(--danger-soft); border-radius: 9px; padding: 8px 12px; font-size: 14px; }
.run-note { color: var(--muted); font-size: 13px; }

.welcome { max-width: 620px; margin: 9vh auto 0; text-align: center; }
.welcome h2 { font-size: 26px; margin: 16px 0 6px; }
.welcome p { color: var(--muted); margin: 0 0 22px; }
.suggestions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; text-align: left; }
.suggestion { border: 1px solid var(--border); background: var(--panel); border-radius: 12px; padding: 11px 13px; font-size: 14px; }
.suggestion:hover { border-color: var(--accent); }
.suggestion b { display: block; font-size: 14px; margin-bottom: 2px; }
.suggestion span { color: var(--muted); font-size: 13px; }

.composer-wrap { padding: 10px 18px 16px; }
.composer { max-width: 820px; margin: 0 auto; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow); padding: 8px 8px 8px 14px; display: flex; align-items: flex-end; gap: 8px; }
.composer:focus-within { border-color: var(--accent); }
.composer textarea { flex: 1; border: 0; outline: none; background: transparent; resize: none; max-height: 220px; min-height: 26px; padding: 6px 0; line-height: 1.5; }
.composer .btn { border-radius: 11px; height: 38px; }
.composer-hint { max-width: 820px; margin: 6px auto 0; font-size: 12px; color: var(--muted); text-align: center; }

.overlay { position: fixed; inset: 0; background: rgba(10,12,16,.45); display: grid; place-items: center; padding: 16px; z-index: 50; }
.modal { background: var(--panel); border-radius: 16px; border: 1px solid var(--border); box-shadow: var(--shadow); width: 100%; max-width: 440px; padding: 22px 22px 18px; max-height: 90vh; overflow: auto; }
.modal h3 { margin: 0 0 14px; font-size: 18px; }
.modal .row { display: flex; justify-content: flex-end; gap: 8px; margin-top: 8px; }
.modal section + section { border-top: 1px solid var(--border); margin-top: 16px; padding-top: 16px; }
.meter { height: 8px; background: var(--panel-2); border-radius: 99px; overflow: hidden; margin: 6px 0 4px; }
.meter > div { height: 100%; background: var(--accent); }
.banner { background: var(--warn-soft); color: var(--warn); padding: 10px 18px; font-size: 14px; display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

/* ---------- admin ---------- */
.admin { max-width: 1180px; margin: 0 auto; padding: 22px 16px 60px; }
.admin header { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 20px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 18px; margin-bottom: 18px; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 12px 18px; }
.table-wrap { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data th, table.data td { padding: 8px 9px; border-bottom: 1px solid var(--border); text-align: left; white-space: nowrap; vertical-align: middle; }
table.data th { color: var(--muted); font-weight: 600; font-size: 12.5px; }
.tag { display: inline-block; font-size: 11.5px; padding: 1px 7px; border-radius: 99px; background: var(--panel-2); color: var(--muted); margin-right: 3px; }
.tag.ok { background: var(--ok-soft); color: var(--ok); } .tag.bad { background: var(--danger-soft); color: var(--danger); } .tag.acc { background: var(--accent-soft); color: var(--accent); }
.actions-cell { display: flex; gap: 4px; flex-wrap: wrap; }
.switch { display: flex; align-items: center; gap: 8px; font-size: 14px; margin-bottom: 10px; }

@keyframes spin { to { transform: rotate(360deg); } }
@keyframes pulse { 50% { opacity: .35; } }

@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: fixed; inset: 0 auto 0 0; width: 84%; max-width: 300px; z-index: 40; transform: translateX(-100%); transition: transform .2s; box-shadow: var(--shadow); }
  .app.nav-open .sidebar { transform: none; }
  .app.nav-open::after { content: ""; position: fixed; inset: 0; background: rgba(0,0,0,.35); z-index: 30; }
  .menu-toggle { display: inline-flex; }
  .topbar { padding: 8px 12px; }
  .messages { padding: 16px 12px 8px; }
  .composer-wrap { padding: 8px 10px 12px; }
  .suggestions { grid-template-columns: 1fr; }
  .msg.user .bubble { max-width: 92%; }
}