:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #646b76;
  --border: #e2e5ea;
  --primary: #0068ff;
  --primary-text: #ffffff;
  --danger: #d93025;
  --ok: #188038;
  --warn-bg: #fff6e0;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171b;
    --card: #1f2227;
    --text: #e8eaed;
    --muted: #9aa0a8;
    --border: #33373e;
    --primary: #4d8dff;
    --danger: #f28b82;
    --ok: #81c995;
    --warn-bg: #3a3222;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  max-width: 960px;
  margin: 0 auto;
}
header h1 { font-size: 20px; margin: 0; }
main {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 16px 40px;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr 1fr;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  min-width: 0;
}
.card.wide { grid-column: 1 / -1; }
.card h2 { font-size: 16px; margin: 0 0 12px; }
@media (max-width: 720px) { main { grid-template-columns: 1fr; } }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.stat { text-align: center; }
.stat b { display: block; font-size: 24px; }
.stat span { color: var(--muted); font-size: 13px; }

button {
  font: inherit;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  border-radius: 8px;
  padding: 8px 14px;
  cursor: pointer;
}
button.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
button.danger { color: var(--danger); }
button:disabled { opacity: 0.5; cursor: default; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

textarea, input {
  font: inherit;
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
}
textarea { min-height: 140px; resize: vertical; }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 4px; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-bottom: 12px; }

.muted { color: var(--muted); font-size: 13px; }
.hint { background: var(--warn-bg); border-radius: 8px; padding: 8px 10px; font-size: 13px; }
.preview { white-space: pre-wrap; background: var(--bg); border-radius: 8px; padding: 10px; font-size: 14px; }
.qr img { width: 220px; height: 220px; background: #fff; border-radius: 8px; display: block; margin: 8px 0; }
.status-line { font-weight: 600; margin: 4px 0 12px; }
.ok { color: var(--ok); }
.err { color: var(--danger); }
.log { list-style: none; margin: 12px 0 0; padding: 0; max-height: 280px; overflow: auto; font-size: 13px; }
.log li { padding: 4px 0; border-top: 1px solid var(--border); }
.log time { color: var(--muted); margin-right: 6px; }
.msg { font-size: 13px; min-height: 18px; margin-top: 6px; }

.login {
  max-width: 360px;
  margin: 12vh auto;
  padding: 0 16px;
}
.login form { display: grid; gap: 12px; }

/* ---------- Phiên bản 2: tab, kịch bản, bảng xác nhận ---------- */
select {
  font: inherit;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  min-width: 200px;
  max-width: 100%;
}
#zalo-connected > * + * { margin-top: 10px; }
#btn-zalo-logout { margin-top: 16px; }
.stats { grid-template-columns: repeat(auto-fit, minmax(100px, 1fr)); }
code { font-size: 12px; background: var(--bg); padding: 1px 4px; border-radius: 4px; }

.composer { border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-top: 12px; }
.composer h3 { font-size: 14px; margin: 0 0 8px; }
.toolbar { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; margin-bottom: 8px; }
.toolbar button { padding: 4px 9px; font-size: 13px; min-width: 32px; }
.toolbar .sep { width: 1px; height: 22px; background: var(--border); margin: 0 4px; }
.toolbar .swatch { background: var(--c); border-color: var(--c); width: 26px; min-width: 26px; height: 26px; padding: 0; }
.editor {
  min-height: 110px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  outline: none;
}
.editor:focus { border-color: var(--primary); }
.editor:empty::before { content: attr(data-placeholder); color: var(--muted); }
.images { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0; }
.images:empty { display: none; }
.thumb { position: relative; }
.thumb img { width: 96px; height: 96px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); display: block; }
.thumb button {
  position: absolute; top: -6px; right: -6px;
  width: 22px; height: 22px; padding: 0; border-radius: 50%;
  font-size: 13px; line-height: 1;
}
label.check { display: inline-flex; gap: 6px; align-items: center; font-size: 14px; color: var(--text); margin: 0; }
label.check input { width: auto; }

dialog {
  width: min(680px, calc(100vw - 32px));
  max-height: calc(100vh - 48px);
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  padding: 20px;
}
dialog::backdrop { background: rgb(0 0 0 / 0.45); }
dialog h2 { margin-top: 0; font-size: 18px; }
.preview-box { margin: 12px 0; display: grid; gap: 8px; }
.preview-box details { border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; }
.preview-box summary { cursor: pointer; }
.preview-box table { width: 100%; border-collapse: collapse; font-size: 13px; margin-top: 8px; }
.preview-box td, .preview-box th { text-align: left; padding: 4px 6px; border-top: 1px solid var(--border); }
.table-wrap { max-height: 220px; overflow: auto; }