:root {
  --bg: #f5f7fa;
  --panel: #ffffff;
  --ink: #1d2b3a;
  --muted: #7b8798;
  --line: #e5e9f0;
  --blue: #0b64e0;
  --blue-soft: #e9f1ff;
  --green: #16a34a;
  --red: #d64545;
  --amber: #b7791f;
  --radius: 10px;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font: 14px/1.55 -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

button { font: inherit; cursor: pointer; }
input, textarea, select { font: inherit; color: inherit; }

.primary {
  background: var(--blue);
  border: 1px solid var(--blue);
  color: #fff;
  border-radius: 8px;
  padding: 7px 14px;
}
.primary:hover { filter: brightness(1.06); }
.primary:disabled { opacity: .55; cursor: default; }

.ghost {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 12px;
  color: var(--ink);
}
.ghost:hover { border-color: #cdd6e3; }
.ghost.active { border-color: var(--blue); color: var(--blue); background: var(--blue-soft); }
.ghost.danger { color: var(--red); border-color: #f0c9c9; }

.muted { color: var(--muted); }
.small { font-size: 12px; }
.mono { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 12px; }
.pad { padding: 12px; }
.spacer { flex: 1; }
.tag {
  font-size: 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 1px 6px;
  color: var(--muted);
  vertical-align: 2px;
}
.badge {
  font-size: 12px;
  border-radius: 999px;
  padding: 2px 10px;
  background: #fff6df;
  color: var(--amber);
  border: 1px solid #f4e3b7;
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  background: rgba(29, 43, 58, .94);
  color: #fff;
  padding: 9px 16px;
  border-radius: 8px;
  z-index: 50;
  max-width: 70vw;
}

/* login */
.login-wrap {
  min-height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background:
    radial-gradient(1200px 500px at 15% -10%, #dce9ff 0%, transparent 60%),
    var(--bg);
}
.login-card {
  width: 380px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 26px 26px 20px;
  box-shadow: 0 18px 45px rgba(31, 45, 71, .08);
}
.brand-lg { font-size: 20px; font-weight: 700; margin-bottom: 4px; }
.login-card form { display: grid; gap: 12px; margin-top: 16px; }
.login-card label { display: grid; gap: 6px; font-size: 13px; color: var(--muted); }
.login-card input {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 9px 10px;
}
.captcha-line { display: flex; gap: 8px; }
.captcha-line input { flex: 1; }
.error { color: var(--red); font-size: 13px; margin: 0; }

/* shell */
.topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; }
.topbar select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 6px 8px;
  max-width: 240px;
}
.status-dot { font-size: 12px; color: var(--muted); }
.status-dot.s-online { color: var(--green); }
.status-dot.s-demo { color: var(--amber); }
.status-dot.s-error, .status-dot.s-offline { color: var(--red); }

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  height: calc(100vh - 53px);
  min-height: 0;
}

/* sidebar */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.toolbar { padding: 10px; border-bottom: 1px solid var(--line); }
.toolbar input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
}
.filters { display: flex; gap: 6px; padding: 8px 10px; border-bottom: 1px solid var(--line); }
.chip {
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 12px;
  color: var(--muted);
}
.chip.active { border-color: var(--blue); color: var(--blue); background: var(--blue-soft); }
.chip-mini {
  font-size: 11px;
  color: var(--muted);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0 6px;
}
.conversation-list { flex: 1; overflow-y: auto; min-height: 0; }
.conv {
  padding: 10px 12px;
  border-bottom: 1px solid #f0f3f7;
  cursor: pointer;
}
.conv:hover { background: #f8fafd; }
.conv.active { background: var(--blue-soft); }
.conv-top { display: flex; align-items: center; gap: 6px; }
.conv-title { font-weight: 600; flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.unread {
  background: var(--red);
  color: #fff;
  font-size: 11px;
  border-radius: 999px;
  min-width: 18px;
  text-align: center;
  padding: 0 5px;
}
.conv-preview {
  color: var(--muted);
  font-size: 12px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin: 2px 0;
}
.conv-foot { display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; }
.sidebar-foot { border-top: 1px solid var(--line); padding: 10px; }
#demo-box { display: flex; gap: 6px; }
#demo-box input { flex: 1; border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }

/* chat */
.chat { display: flex; flex-direction: column; min-height: 0; }
.chat-empty {
  margin: auto;
  text-align: center;
  color: var(--muted);
}
.chat-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: var(--panel);
}
.chat-meta { flex: 1; min-width: 0; }
.chat-title { font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-actions { display: flex; gap: 6px; }
.messages { flex: 1; overflow-y: auto; padding: 16px; min-height: 0; }
.msg { display: flex; flex-direction: column; margin-bottom: 12px; }
.msg.out { align-items: flex-end; }
.bubble {
  max-width: min(680px, 72%);
  border-radius: 10px;
  padding: 8px 12px;
  white-space: pre-wrap;
  word-break: break-word;
  background: #fff;
  border: 1px solid var(--line);
}
.bubble.out { background: var(--blue-soft); border-color: #cfe0ff; }
.meta { display: flex; gap: 8px; color: var(--muted); font-size: 11px; margin-top: 4px; }
.msg-status.st-failed, .msg-status.st-blocked { color: var(--red); }
.msg-status.st-sent { color: var(--green); }
.msg-status.st-queued, .msg-status.st-sending { color: var(--amber); }
.composer {
  display: flex;
  gap: 10px;
  padding: 10px 16px 14px;
  border-top: 1px solid var(--line);
  background: var(--panel);
}
.composer textarea {
  flex: 1;
  resize: none;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 11px;
}
.composer-side { display: flex; flex-direction: column; justify-content: space-between; align-items: flex-end; gap: 6px; }

/* admin */
.admin { padding: 18px; overflow-y: auto; height: calc(100vh - 53px); display: grid; gap: 18px; content-visibility: auto; }
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.card h2 { margin: 0 0 12px; font-size: 16px; }
.card h3 { margin: 18px 0 8px; font-size: 14px; }
.table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table th, .table td { text-align: left; padding: 7px 8px; border-bottom: 1px solid #f0f3f7; vertical-align: top; }
.table th { color: var(--muted); font-weight: 500; }
.actions { display: flex; gap: 6px; flex-wrap: wrap; }
.row-form { display: flex; gap: 8px; flex-wrap: wrap; }
.row-form input, .row-form select {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 8px 10px;
  min-width: 180px;
  flex: 1;
}

@media (max-width: 900px) {
  .layout { grid-template-columns: 260px 1fr; }
  .chat-actions { display: none; }
}

/* attachments & extras */
.attachment-bar { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 6px; }
.attachment-chip {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); border-radius: 999px;
  padding: 2px 10px; font-size: 12px; background: #fff;
}
.att-img { max-width: 240px; max-height: 200px; border-radius: 8px; display: block; border: 1px solid var(--line); }
.att-file { display: inline-flex; align-items: center; gap: 4px; color: var(--blue); text-decoration: none; font-size: 13px; }
.att-row { margin-top: 6px; display: flex; flex-direction: column; gap: 6px; }
.linkish { border: none; background: none; color: var(--blue); cursor: pointer; padding: 0 2px; font-size: 11px; }
.composer-main { flex: 1; display: flex; flex-direction: column; }
.stack { display: grid; gap: 10px; }
.inline { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.demo-row { display: flex; gap: 6px; margin-top: 6px; }
.demo-row input { flex: 1; border: 1px solid var(--line); border-radius: 8px; padding: 6px 8px; }
.dialog-form { display: grid; gap: 10px; min-width: 340px; }
.dialog-form h3 { margin: 0; }
.dialog-form select, .dialog-form input {
  border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px;
}
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
#captcha-img { height: 54px; border: 1px solid var(--line); border-radius: 8px; cursor: pointer; background: #fff; }
#totp-secret-box { display: grid; gap: 6px; border: 1px dashed var(--line); border-radius: 8px; padding: 10px; }

.chat-details {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 6px 18px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--line);
  background: #fbfcfe;
  font-size: 12px;
}
.chat-details div { display: flex; gap: 8px; }
.chat-details span { color: var(--muted); min-width: 84px; }
.chat-details .wide { grid-column: 1 / -1; }
.stack > button { justify-self: start; }

/* stats & tenant management */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 10px; }
.stat-item { border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; background: #fbfcfe; }
.stat-item b { display: block; font-size: 20px; }
.stat-item span { color: var(--muted); font-size: 12px; }
.code-list { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.code-pill {
  border: 1px dashed var(--line); border-radius: 8px; padding: 4px 10px;
  font-family: ui-monospace, monospace; font-size: 12px; background: #fff;
}
.code-pill.used { color: var(--muted); text-decoration: line-through; }
.badge.warn { background: #fff1f0; color: var(--red); border-color: #f0c9c9; }
.badge.ok { background: #eefaf0; color: var(--green); border-color: #c9ebd3; }