:root {
  --bg: #f4f6f9;
  --card: #ffffff;
  --sidebar-bg: #1c2733;
  --sidebar-text: #c8d1db;
  --sidebar-active: #1877f2;
  --primary: #1877f2;
  --primary-dark: #145dbf;
  --text: #1c1e21;
  --muted: #65676b;
  --border: #e2e5e9;
  --danger: #e74c3c;
  --success: #2e7d32;
  --warn: #b8860b;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16171a;
    --card: #232427;
    --sidebar-bg: #131417;
    --sidebar-text: #a9b2bc;
    --text: #e4e6eb;
    --muted: #9a9ea3;
    --border: #34363a;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

/* ===== App shell: sidebar + main ===== */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

.sidebar {
  width: 220px;
  flex: none;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  padding: 18px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 0 18px 18px;
  margin-bottom: 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}
.brand-icon { font-size: 26px; }
.brand-title { color: #fff; font-weight: 700; font-size: 15px; line-height: 1.3; }
.brand-sub { font-size: 12px; opacity: 0.7; }

.nav {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 10px;
  flex: 1;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  border: none;
  color: var(--sidebar-text);
  text-align: left;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
}
.nav-item:hover { background: rgba(255, 255, 255, 0.06); filter: none; }
.nav-item.active { background: var(--sidebar-active); color: #fff; font-weight: 600; }
.nav-icon { font-size: 16px; width: 18px; text-align: center; }

.sidebar-footer {
  padding: 12px 18px 4px;
  font-size: 11.5px;
  line-height: 1.5;
  opacity: 0.65;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.main-area {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.topbar {
  padding: 18px 28px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  flex: none;
}
.topbar h1 { margin: 0; font-size: 19px; }

main {
  flex: 1;
  overflow-y: auto;
  padding: 22px 28px 40px;
  display: flex;
  flex-direction: column;
  gap: 18px;
}

/* ===== Views (only .active shown) ===== */
.view { display: none; flex-direction: column; gap: 18px; }
.view.active { display: flex; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 22px;
  box-shadow: var(--shadow);
}
.card h2 { margin-top: 0; font-size: 15px; font-weight: 600; }

.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.schedule-label { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); }

input, textarea, select, button {
  font-size: 14px;
  padding: 9px 13px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  font-family: inherit;
}
input[type="text"], input[type="datetime-local"] { flex: 1; min-width: 180px; }
textarea { width: 100%; resize: vertical; line-height: 1.5; }

button {
  cursor: pointer;
  background: #eef0f3;
  border: 1px solid transparent;
  font-weight: 500;
  transition: filter 0.1s;
}
button.primary { background: var(--primary); color: white; }
button.primary:hover { background: var(--primary-dark); }
button:hover { filter: brightness(0.96); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== Dashboard ===== */
.dashboard-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 18px;
}
.dashboard-summary .stat {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 14px 10px;
  text-align: center;
}
.dashboard-summary .stat .num { font-size: 22px; font-weight: 700; display: block; }
.dashboard-summary .stat .label { font-size: 12px; color: var(--muted); }

/* ===== Alert banner (in topbar) ===== */
.alert-banner {
  background: #fdecea;
  color: #7a1f16;
  border: 1px solid var(--danger);
  border-radius: 8px;
  padding: 9px 14px;
  font-size: 13.5px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  flex: 1;
}
@media (prefers-color-scheme: dark) {
  .alert-banner { background: #3a1a17; color: #ffb4a8; }
}
.alert-banner button { background: transparent; border: 1px solid currentColor; color: inherit; padding: 4px 10px; }

/* ===== Page picker ===== */
.page-picker { border: 1px solid var(--border); border-radius: 10px; padding: 14px; background: var(--bg); }
.page-picker-header { display: flex; justify-content: space-between; align-items: center; font-size: 13px; color: var(--muted); margin-bottom: 8px; flex-wrap: wrap; gap: 6px; }
.select-all { display: flex; align-items: center; gap: 4px; font-size: 13px; color: var(--text); cursor: pointer; }
.page-checkbox-list { display: flex; flex-direction: column; gap: 2px; max-height: 320px; overflow-y: auto; }
.page-checkbox-list label { display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 18px; border-radius: 6px; cursor: pointer; font-weight: normal; }
.page-checkbox-list label:hover { background: rgba(24, 119, 242, 0.08); }
.page-checkbox-list .empty { color: var(--muted); font-size: 13px; padding: 6px 8px; }

.picker-group { margin-bottom: 6px; }
.picker-group-title {
  display: flex; justify-content: space-between; align-items: center;
  padding: 6px 8px; font-size: 12.5px; font-weight: 600; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.02em;
}
.picker-group-title .selectGroupBtn { font-size: 11.5px; padding: 3px 9px; color: var(--primary); background: transparent; border: 1px solid var(--border); }

.group-badge {
  display: inline-block; background: rgba(24, 119, 242, 0.12); color: var(--primary);
  font-size: 11px; font-weight: 600; padding: 2px 8px; border-radius: 10px; margin-right: 6px;
}
.pageGroupSelect { font-size: 12.5px; padding: 5px 8px; }

.fb-login-btn {
  display: inline-block;
  background: var(--primary);
  color: white;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 14px;
}
.fb-login-btn:hover { background: var(--primary-dark); }
.hint { color: var(--muted); font-size: 13px; margin: 10px 0; line-height: 1.5; }
.hint code { background: var(--bg); padding: 1px 5px; border-radius: 4px; }

.list { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-direction: column; gap: 6px; }
.list li {
  display: flex; justify-content: space-between; align-items: center;
  padding: 9px 12px; border: 1px solid var(--border); border-radius: 8px;
  flex-wrap: wrap; gap: 8px;
}
.list li .li-actions { display: flex; gap: 6px; align-items: center; }
.list li button { background: transparent; color: var(--danger); border: none; }
.list li .viewPage { color: var(--primary); }
.list li .openFbLink { color: var(--muted); font-size: 13px; text-decoration: none; padding: 6px 8px; }
.list li .openFbLink:hover { text-decoration: underline; }
.list li.list-group-header {
  background: transparent; border: none; padding: 14px 4px 4px;
  font-size: 12.5px; font-weight: 700; color: var(--primary);
  text-transform: uppercase; letter-spacing: 0.03em;
}
.list li.list-group-header:first-child { padding-top: 4px; }

/* ===== Page preview ===== */
.back-btn { align-self: flex-start; background: transparent; border: 1px solid var(--border); }
.pp-cover {
  height: 160px; margin: -20px -22px 0; border-radius: 12px 12px 0 0;
  background-size: cover; background-position: center; background-color: var(--bg);
}
.pp-header { display: flex; align-items: flex-end; gap: 14px; margin-top: -34px; padding: 0 4px; }
.pp-avatar { width: 76px; height: 76px; border-radius: 50%; border: 3px solid var(--card); object-fit: cover; background: var(--bg); }
.pp-feed { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-top: 12px; }
.pp-post {
  display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: 10px;
  overflow: hidden; text-decoration: none; color: var(--text); background: var(--bg);
}
.pp-post:hover { border-color: var(--primary); }
.pp-post img { width: 100%; height: 130px; object-fit: cover; }
.pp-post-noimg { width: 100%; height: 60px; display: flex; align-items: center; justify-content: center; font-size: 24px; background: var(--card); }
.pp-post-body { padding: 10px 12px; }
.pp-post-msg { font-size: 13px; line-height: 1.4; max-height: 3.9em; overflow: hidden; }

.tabs { display: flex; gap: 8px; margin-bottom: 14px; flex-wrap: wrap; align-items: center; }
.tab { background: transparent; border: 1px solid var(--border); border-radius: 20px; padding: 7px 16px; }
.tab.active { background: var(--primary); color: white; border-color: var(--primary); }

/* ===== Tables ===== */
.table-wrap { overflow: auto; border: 1px solid var(--border); border-radius: 10px; max-height: calc(100vh - 320px); }
.table-wrap.tall { max-height: calc(100vh - 260px); }

table { width: 100%; border-collapse: collapse; font-size: 13px; }
th, td { text-align: left; padding: 10px; border-bottom: 1px solid var(--border); vertical-align: top; white-space: nowrap; }
td.content-cell { max-width: 280px; white-space: normal; word-break: break-word; }
.content-text {
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  cursor: pointer;
  white-space: pre-wrap;
}
.content-text.expanded { -webkit-line-clamp: unset; }
th {
  position: sticky; top: 0; background: var(--card); z-index: 1;
  font-size: 12px; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted);
}
tbody tr:hover { background: rgba(24, 119, 242, 0.04); }
img.thumb { max-width: 56px; max-height: 56px; border-radius: 6px; }

.badge { padding: 3px 10px; border-radius: 12px; font-size: 12px; color: white; white-space: nowrap; }
.badge.pending { background: var(--warn); }
.badge.published { background: var(--success); }
.badge.failed { background: var(--danger); }

/* ===== Nav badge (so tin nhan chua doc) ===== */
.nav-item { position: relative; }
.nav-badge {
  background: var(--danger); color: #fff; font-size: 11px; font-weight: 700;
  border-radius: 10px; padding: 1px 7px; margin-left: auto;
}

/* ===== Inbox (Tin nhan Messenger chung nhieu Page) ===== */
.inbox-shell { display: flex; height: calc(100vh - 160px); min-height: 420px; }
.inbox-list-pane {
  width: 300px; flex: none; border-right: 1px solid var(--border);
  display: flex; flex-direction: column; min-height: 0;
}
.conv-list { list-style: none; margin: 0; padding: 0; overflow-y: auto; flex: 1; }
.conv-list li {
  padding: 12px 14px; border-bottom: 1px solid var(--border); cursor: pointer;
}
.conv-list li:hover { background: rgba(24, 119, 242, 0.06); }
.conv-list li.active { background: rgba(24, 119, 242, 0.12); }
.conv-list li .conv-top { display: flex; justify-content: space-between; gap: 6px; font-size: 13.5px; }
.conv-list li .conv-page { font-size: 11.5px; color: var(--muted); margin: 1px 0 4px; }
.conv-list li .conv-preview { font-size: 12.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-list li.unread .conv-top strong { font-weight: 700; }
.conv-list li.unread .conv-preview { color: var(--text); font-weight: 600; }
.conv-list li .unread-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--primary); flex: none; margin-top: 4px; }
.conv-list .empty { padding: 20px 14px; color: var(--muted); font-size: 13px; }

.inbox-thread-pane { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.thread-header {
  padding: 12px 16px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap;
}
.ai-toggle { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--muted); cursor: pointer; white-space: nowrap; }
.thread-messages { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 8px; background: var(--bg); }
.msg-bubble { max-width: 70%; padding: 8px 13px; border-radius: 14px; font-size: 13.5px; line-height: 1.45; }
.msg-in { align-self: flex-start; background: var(--card); border: 1px solid var(--border); border-bottom-left-radius: 4px; }
.msg-out { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.msg-out.via-ai { background: #6b46c1; }
.msg-time { font-size: 10.5px; opacity: 0.65; margin-top: 3px; display: block; }
.thread-reply-row { display: flex; gap: 8px; padding: 10px 14px; border-top: 1px solid var(--border); }
.thread-reply-row input { flex: 1; }

/* ===== Hop thoai tu ve (thay prompt/confirm goc) ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0, 0, 0, 0.45);
  display: flex; align-items: center; justify-content: center; z-index: 1000;
}
.modal-box {
  background: var(--card); border-radius: 12px; padding: 20px;
  width: min(360px, 90vw); box-shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
}
.modal-msg { margin: 0 0 12px; font-size: 14px; line-height: 1.5; }
.modal-input { width: 100%; margin-bottom: 14px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 8px; }

/* ===== Responsive ===== */
@media (max-width: 860px) {
  .app-shell { flex-direction: column; height: auto; min-height: 100vh; }
  .sidebar { width: 100%; flex-direction: row; align-items: center; padding: 10px 12px; overflow-x: auto; }
  .brand { border-bottom: none; padding: 0 12px 0 0; margin-bottom: 0; }
  .sidebar-footer { display: none; }
  .nav { flex-direction: row; padding: 0; flex: none; }
  .nav-item span:last-child { display: none; }
  .nav-item { padding: 8px 10px; }
  .main-area { height: auto; }
  main { overflow-y: visible; }
  .table-wrap.tall { max-height: 420px; }
}