:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --border: #e3e6ee;
  --text: #121826;
  --muted: #6b7385;
  --accent: #2f6fed;
  --accent-ink: #ffffff;
  --ok: #17803d;
  --ok-bg: #e5f6ea;
  --warn: #9a5b00;
  --warn-bg: #fff3d6;
  --bad: #c0262d;
  --bad-bg: #fde8e8;
  --code-bg: #eef1f7;
  --radius: 12px;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0e121a;
    --surface: #161b26;
    --border: #262d3b;
    --text: #e6e9f0;
    --muted: #8d95a8;
    --accent: #5b8cff;
    --ok: #4ccb76;
    --ok-bg: #12301d;
    --warn: #f0b545;
    --warn-bg: #33270d;
    --bad: #ff6b6b;
    --bad-bg: #3a1618;
    --code-bg: #1f2533;
  }
}

* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--text); font: 15px/1.5 system-ui, -apple-system, "Segoe UI", "Noto Sans Bengali", sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
code { background: var(--code-bg); padding: 1px 6px; border-radius: 6px; font-size: .9em; }
h1 { font-size: 1.5rem; margin: 0; }
h2 { font-size: 1.05rem; margin: 0 0 12px; display: flex; align-items: baseline; gap: 10px; }

.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 20px;
  background: var(--surface); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 5; flex-wrap: wrap; }
.brand { font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.logo { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--accent); color: var(--accent-ink); }
nav { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
nav a, nav .link { padding: 6px 10px; border-radius: 8px; color: var(--muted); }
nav a.active, nav a:hover { background: var(--code-bg); color: var(--text); text-decoration: none; }
nav form { margin: 0; }
.link { background: none; border: 0; font: inherit; cursor: pointer; }

.page { max-width: 1280px; margin: 0 auto; padding: 20px 16px 48px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; margin-bottom: 16px; min-width: 0; }
.card.narrow { max-width: 400px; margin: 8vh auto; }
.stack > .card:last-child { margin-bottom: 0; }
.muted { color: var(--muted); }
.small { font-size: .85em; }
.big { font-size: 1.4rem; font-weight: 700; }
.row-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }

.flash { padding: 10px 14px; border-radius: 10px; background: var(--ok-bg); color: var(--text); margin-bottom: 14px; border: 1px solid var(--border); }
.flash.error { background: var(--bad-bg); }
.error-text { color: var(--bad); margin: 6px 0 0; }
.secret { font-size: 1.05em; user-select: all; }

.form { display: flex; flex-direction: column; gap: 12px; }
.form.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.form.inline { flex-direction: row; flex-wrap: wrap; align-items: flex-end; margin-bottom: 12px; }
.form label { display: flex; flex-direction: column; gap: 4px; font-size: .9em; color: var(--muted); }
.form label.check { flex-direction: row; align-items: center; gap: 8px; color: var(--text); }
.form label.wide, .form-actions { grid-column: 1 / -1; }
input, select, textarea { font: inherit; color: var(--text); background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 10px; width: 100%; }
input[type=checkbox] { width: auto; }
input:focus, select:focus, textarea:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
textarea { resize: vertical; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 14px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text); font: inherit; cursor: pointer; white-space: nowrap; }
.btn:hover { background: var(--code-bg); text-decoration: none; }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn.primary:hover { filter: brightness(1.08); }
.btn.danger { color: var(--bad); border-color: var(--bad); }
.btn.warn { color: var(--warn); border-color: var(--warn); }
.btn.small { padding: 4px 10px; font-size: .85em; }
.btn:disabled { opacity: .5; cursor: default; }

.table-wrap { overflow-x: auto; }
.table { width: 100%; border-collapse: collapse; }
.table th, .table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid var(--border); vertical-align: top; }
.table th { font-size: .8em; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
.table.compact td { padding: 6px 8px; }
.table .num { text-align: right; font-variant-numeric: tabular-nums; }
.table .actions { display: flex; gap: 6px; justify-content: flex-end; flex-wrap: wrap; }
.table .actions form { margin: 0; }
.pos { color: var(--ok); }
.neg { color: var(--bad); }

.pill { display: inline-block; padding: 1px 9px; border-radius: 999px; font-size: .8em; background: var(--code-bg); color: var(--muted); }
.pill.ok { background: var(--ok-bg); color: var(--ok); }
.pill.warn { background: var(--warn-bg); color: var(--warn); }
.pill.bad { background: var(--bad-bg); color: var(--bad); }

/* Dashboard */
.site-head { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; }
.site-url { word-break: break-all; }
.stats { display: flex; gap: 24px; margin: 0; flex-wrap: wrap; }
.stats dt { font-size: .8em; color: var(--muted); }
.stats dd { margin: 0; font-weight: 700; font-size: 1.1rem; font-variant-numeric: tabular-nums; }
.dash-grid, .admin-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.admin-grid { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
.chat { display: flex; flex-direction: column; height: calc(100vh - 230px); min-height: 480px; margin: 0; }
.chat-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 8px; }
.chat-head h2 { margin: 0; }
.log { list-style: none; margin: 0; padding: 4px; flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 6px; }
.ev { display: flex; gap: 8px; font-size: .92em; }
.ev b { flex: none; font-size: .85em; color: var(--muted); min-width: 28px; padding-top: 2px; }
.ev-text { white-space: pre-wrap; word-break: break-word; min-width: 0; }
.ev-user { background: var(--code-bg); padding: 10px 12px; border-radius: 10px; margin-top: 10px; }
.ev-ai .ev-text { padding: 2px 0; }
.ev-tool { color: var(--muted); font-size: .84em; padding-left: 36px; }
.ev-tool .ev-text::before { content: "› "; }
.ev-error { color: var(--bad); font-size: .9em; padding-left: 36px; }
.ev-done { color: var(--muted); font-size: .8em; padding-left: 36px; border-bottom: 1px dashed var(--border); padding-bottom: 8px; }
.ask { border-top: 1px solid var(--border); padding-top: 12px; margin-top: 8px; }
.ask-row { display: flex; gap: 8px; align-items: center; margin-top: 8px; justify-content: flex-end; flex-wrap: wrap; }
.ask-row select { width: auto; max-width: 240px; }
.working { color: var(--accent); font-size: .9em; margin-right: auto; animation: pulse 1.4s ease-in-out infinite; }
@keyframes pulse { 50% { opacity: .45; } }
.preview { display: flex; flex-direction: column; margin: 0; }
.preview iframe { width: 100%; height: calc(100vh - 290px); min-height: 440px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }

@media (max-width: 900px) {
  .dash-grid, .admin-grid { grid-template-columns: minmax(0, 1fr); }
  .chat { height: 70vh; }
  .preview iframe { height: 60vh; }
}