:root {
  --bg: #f4f5f7;
  --panel: #ffffff;
  --text: #16181d;
  --muted: #6b7280;
  --border: #e3e5e9;
  --accent: #1f6feb;
  --accent-text: #ffffff;
  --ok: #157f3b;
  --ok-bg: #e5f5ea;
  --warn: #9a5b00;
  --warn-bg: #fff4dc;
  --bad: #b42318;
  --bad-bg: #fde8e6;
  --in-bg: #ffffff;
  --out-bg: #dcebff;
  --note-bg: #fff8d6;
  --sys-bg: #eceef2;
  --radius: 10px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1115;
    --panel: #171a21;
    --text: #e6e8ec;
    --muted: #9aa1ad;
    --border: #2a2f3a;
    --accent: #4c8dff;
    --ok: #4cc27a;
    --ok-bg: #12301f;
    --warn: #f0b14a;
    --warn-bg: #352a12;
    --bad: #ff7a6e;
    --bad-bg: #3a1714;
    --in-bg: #1e222b;
    --out-bg: #1a3156;
    --note-bg: #3a3315;
    --sys-bg: #232731;
    color-scheme: dark;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; }
body {
  background: var(--bg);
  color: var(--text);
  font: 14px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, textarea, select { font: inherit; color: inherit; }
button {
  border: 1px solid var(--border); background: var(--panel); border-radius: 8px;
  padding: 7px 12px; cursor: pointer;
}
button:hover:not(:disabled) { border-color: var(--accent); }
button:disabled { opacity: .5; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); font-weight: 600; }
button.danger { color: var(--bad); }
button.small { padding: 3px 8px; font-size: 12px; }
input[type=text], input[type=password], input[type=number], textarea, select {
  border: 1px solid var(--border); background: var(--panel); border-radius: 8px; padding: 8px 10px; width: 100%;
}
textarea { resize: vertical; min-height: 70px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }
.center { display: grid; place-items: center; min-height: 100vh; padding: 16px; }
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.login-card { width: 100%; max-width: 420px; text-align: center; }
.login-card h1 { font-size: 20px; margin: 0 0 4px; }
.code {
  font: 600 38px/1.2 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; letter-spacing: 4px;
  margin: 18px 0 6px; user-select: all;
}
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.row.center-row { justify-content: center; }
.stack > * + * { margin-top: 12px; }
.status-line { margin-top: 16px; font-weight: 600; }
.chip { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; background: var(--sys-bg); color: var(--muted); white-space: nowrap; }
.chip.ok { background: var(--ok-bg); color: var(--ok); }
.chip.warn { background: var(--warn-bg); color: var(--warn); }
.chip.bad { background: var(--bad-bg); color: var(--bad); }
.chip.accent { background: var(--accent); color: var(--accent-text); }

/* Shell */
.shell { display: flex; flex-direction: column; height: 100vh; }
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 0 16px; height: 52px; flex: none;
  background: var(--panel); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; white-space: nowrap; }
.nav { display: flex; gap: 4px; overflow-x: auto; flex: 1; }
.nav a { padding: 6px 10px; border-radius: 8px; color: var(--muted); white-space: nowrap; }
.nav a.active { background: var(--sys-bg); color: var(--text); text-decoration: none; }
.who { white-space: nowrap; }
.main { flex: 1; min-height: 0; overflow: auto; }
.page { max-width: 1100px; margin: 0 auto; padding: 20px 16px; }
.page h2 { margin: 0 0 14px; font-size: 18px; }
.banner { padding: 10px 16px; background: var(--warn-bg); color: var(--warn); border-bottom: 1px solid var(--border); }

/* Inbox split */
.split { display: grid; grid-template-columns: 340px 1fr; height: 100%; }
.list-pane { border-right: 1px solid var(--border); display: flex; flex-direction: column; min-height: 0; background: var(--panel); }
.list-tools { padding: 10px; border-bottom: 1px solid var(--border); display: grid; grid-template-columns: 1fr auto; gap: 8px; }
.list { overflow-y: auto; flex: 1; }
.conv-item { display: block; padding: 10px 12px; border-bottom: 1px solid var(--border); color: inherit; }
.conv-item:hover { background: var(--bg); text-decoration: none; }
.conv-item.active { background: var(--sys-bg); }
.conv-item .top { display: flex; justify-content: space-between; gap: 8px; }
.conv-item .name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.conv-item .preview { color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; margin-top: 2px; }
.badge { background: var(--accent); color: var(--accent-text); border-radius: 999px; font-size: 11px; padding: 0 7px; font-weight: 700; }
.conv-pane { display: flex; flex-direction: column; min-height: 0; }
.conv-head { padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--panel); }
.conv-head h3 { margin: 0; font-size: 16px; }
.msgs { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.msg { max-width: min(640px, 85%); padding: 8px 11px; border-radius: 12px; border: 1px solid var(--border); white-space: pre-wrap; word-wrap: break-word; }
.msg.inbound { align-self: flex-start; background: var(--in-bg); }
.msg.outbound { align-self: flex-end; background: var(--out-bg); }
.msg.internal { align-self: flex-end; background: var(--note-bg); border-style: dashed; }
.msg.system { align-self: center; background: var(--sys-bg); font-size: 12px; max-width: 90%; }
.msg .meta { font-size: 11px; color: var(--muted); margin-bottom: 3px; display: flex; gap: 6px; flex-wrap: wrap; align-items: center; white-space: normal; }
.msg img { max-width: 100%; max-height: 320px; border-radius: 8px; display: block; margin-bottom: 4px; }
.msg.deleted .body { text-decoration: line-through; opacity: .7; }
.composer { border-top: 1px solid var(--border); padding: 10px 16px; background: var(--panel); }
.composer .row { margin-top: 8px; justify-content: space-between; }
.empty { display: grid; place-items: center; height: 100%; color: var(--muted); padding: 16px; text-align: center; }
.back-link { display: none; }

table { width: 100%; border-collapse: collapse; background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); vertical-align: top; }
th { font-size: 12px; color: var(--muted); font-weight: 600; background: var(--bg); }
.table-wrap { overflow-x: auto; }
.grid2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 16px; }
.kv { display: grid; grid-template-columns: max-content 1fr; gap: 4px 12px; }
.kv dt { color: var(--muted); }
.kv dd { margin: 0; word-break: break-all; }
pre.json { white-space: pre-wrap; word-break: break-all; font-size: 12px; background: var(--bg); padding: 8px; border-radius: 8px; margin: 0; }
.switch { display: flex; gap: 10px; align-items: center; }
label.field { display: block; }
label.field > span { display: block; font-size: 12px; color: var(--muted); margin-bottom: 4px; }

#toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); max-width: calc(100% - 32px);
  background: var(--text); color: var(--bg); padding: 10px 16px; border-radius: 8px; opacity: 0; pointer-events: none; transition: opacity .2s;
}
#toast.show { opacity: .95; }

@media (max-width: 760px) {
  .topbar { gap: 8px; padding: 0 10px; }
  .brand span { display: none; }
  .who .name { display: none; }
  .split { grid-template-columns: 1fr; }
  .split.has-conv .list-pane { display: none; }
  .split:not(.has-conv) .conv-pane { display: none; }
  .back-link { display: inline; }
  .msg { max-width: 92%; }
}

.err { color: var(--bad); }
.mt4 { margin-top: 4px; } .mt6 { margin-top: 6px; } .mt12 { margin-top: 12px; } .mt14 { margin-top: 14px; } .mt18 { margin-top: 18px; }
.m0 { margin: 0; }
.row.between { justify-content: space-between; }

.quote { border-left: 3px solid var(--accent); padding: 2px 8px; margin-bottom: 4px; font-size: 12px; color: var(--muted); background: var(--bg); border-radius: 4px; white-space: pre-wrap; }
.quote-bar { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; padding: 4px 8px; border-left: 3px solid var(--accent); background: var(--bg); border-radius: 4px; font-size: 12px; }
.quote-bar[hidden] { display: none; }
.msg-tools { display: flex; gap: 10px; margin-top: 4px; justify-content: flex-end; }
button.link { border: 0; background: none; padding: 0; color: var(--accent); font-size: 12px; cursor: pointer; }
button.link.danger { color: var(--bad); }