:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c1f24;
  --muted: #6b7280;
  --border: #e2e5ea;
  --primary: #2563eb;
  --primary-text: #ffffff;
  --ok: #15803d;
  --ok-bg: #dcfce7;
  --err: #b91c1c;
  --err-bg: #fee2e2;
  --warn-bg: #fef3c7;
  --code-bg: #0f172a;
  --code-text: #e2e8f0;
  --tg-bg: #c8d7a8;
  --tg-bubble: #ffffff;
  --tg-link: #168acd;
  --tg-time: #8a9aa8;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --card: #181b21;
    --text: #e6e8eb;
    --muted: #9aa1ab;
    --border: #2a2f37;
    --primary: #3b82f6;
    --ok: #4ade80;
    --ok-bg: #14301f;
    --err: #f87171;
    --err-bg: #3a1717;
    --warn-bg: #3a2e10;
    --code-bg: #0b0d11;
    --tg-bg: #0e1621;
    --tg-bubble: #182533;
    --tg-link: #6ab3f3;
    --tg-time: #6d7f8f;
    color-scheme: dark;
  }
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body.center { min-height: 100vh; display: grid; place-items: center; padding: 16px; }

h1 { font-size: 20px; margin: 0; }
h2 { font-size: 16px; margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 13px; }

header {
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  padding: 14px 16px; background: var(--card); border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 5;
}
header .spacer { flex: 1; }

main { max-width: 1100px; margin: 0 auto; padding: 16px; display: grid; gap: 16px; grid-template-columns: 1fr 1fr; }
main .full { grid-column: 1 / -1; }
@media (max-width: 820px) { main { grid-template-columns: 1fr; } }

.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 16px; min-width: 0; }
.login { width: 100%; max-width: 360px; display: grid; gap: 12px; }

label { display: grid; gap: 4px; font-size: 13px; font-weight: 600; }
label .muted { font-weight: 400; }
input, textarea {
  width: 100%; padding: 8px 10px; font: inherit; color: var(--text);
  background: var(--bg); border: 1px solid var(--border); border-radius: 6px;
}
input:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; }
textarea { min-height: 140px; resize: vertical; }
.check { display: flex; align-items: center; gap: 8px; font-weight: 500; }
.check input { width: auto; }

.grid { display: grid; gap: 12px; align-content: start; }
.row { display: grid; gap: 12px; grid-template-columns: 1fr 1fr; }
@media (max-width: 480px) { .row { grid-template-columns: 1fr; } }

button {
  font: inherit; font-weight: 600; padding: 8px 14px; border-radius: 6px; cursor: pointer;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
}
button:hover { border-color: var(--muted); }
button:disabled { opacity: .6; cursor: wait; }
button.primary { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }
button.danger { color: var(--err); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }

.pill { font-size: 12px; font-weight: 700; padding: 3px 10px; border-radius: 999px; }
.pill.on { background: var(--ok-bg); color: var(--ok); }
.pill.off { background: var(--err-bg); color: var(--err); }

dl.stats { display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; margin: 0 0 14px; font-size: 14px; }
dl.stats dt { color: var(--muted); }
dl.stats dd { margin: 0; overflow-wrap: anywhere; }

.alert { background: var(--err-bg); color: var(--err); padding: 8px 12px; border-radius: 6px; margin: 0; font-size: 14px; }
.results { list-style: none; padding: 0; margin: 12px 0 0; display: grid; gap: 6px; font-size: 14px; }
.results li { padding: 6px 10px; border-radius: 6px; overflow-wrap: anywhere; }
.results .ok { background: var(--ok-bg); }
.results .fail { background: var(--err-bg); }

.photo { display: flex; gap: 12px; align-items: flex-start; flex-wrap: wrap; }
.photo img { max-width: 220px; max-height: 220px; border-radius: 8px; border: 1px solid var(--border); }
.photo .empty { width: 220px; height: 120px; display: grid; place-items: center; border: 1px dashed var(--border); border-radius: 8px; color: var(--muted); font-size: 13px; }

.preview {
  white-space: pre-wrap; overflow-wrap: anywhere; background: var(--bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 10px 12px; font-size: 14px; font-family: inherit; margin: 0;
}

.log {
  background: var(--code-bg); color: var(--code-text); border-radius: 8px; padding: 10px 12px; margin: 0;
  font: 12px/1.6 ui-monospace, SFMono-Regular, Menlo, monospace; max-height: 420px; overflow: auto;
  white-space: pre-wrap; overflow-wrap: anywhere;
}
.log .debug { opacity: .6; }

.toast {
  position: fixed; left: 50%; bottom: 20px; transform: translateX(-50%); z-index: 10;
  padding: 10px 16px; border-radius: 8px; font-size: 14px; max-width: calc(100% - 32px);
  background: var(--text); color: var(--bg); box-shadow: 0 6px 20px rgba(0,0,0,.2);
}
.toast.error { background: var(--err); color: #fff; }

.warn { background: var(--warn-bg); padding: 8px 12px; border-radius: 6px; margin: 0 0 12px; font-size: 14px; }
.actions.end { justify-content: flex-end; margin-top: 14px; }

dialog {
  width: min(480px, calc(100% - 32px)); max-height: calc(100vh - 32px); overflow: auto;
  border: 1px solid var(--border); border-radius: 12px; padding: 16px;
  background: var(--card); color: var(--text);
}
dialog::backdrop { background: rgba(0, 0, 0, .5); }
dialog h2 { margin-bottom: 4px; }
dialog > .muted { margin: 0 0 12px; overflow-wrap: anywhere; }

/* Giả lập khung chat Telegram */
.tg-chat { background: var(--tg-bg); border-radius: 10px; padding: 14px; }
.tg-bubble {
  background: var(--tg-bubble); border-radius: 12px 12px 12px 4px; max-width: 340px; overflow: hidden;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .15); color: var(--text);
}
.tg-bubble img { display: block; width: 100%; height: auto; } /* Telegram hiện ảnh đầy đủ, không cắt */
.tg-text { padding: 8px 10px 0; white-space: pre-wrap; overflow-wrap: anywhere; font-size: 14px; }
.tg-text a { color: var(--tg-link); text-decoration: none; }
.tg-time { text-align: right; font-size: 11px; color: var(--tg-time); padding: 2px 10px 6px; }

.preview-col .warn { margin: 0; }

h3 { font-size: 14px; margin: 0; }
.schedule { background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 12px; }
.schedule input:not([type=checkbox]) { background: var(--card); }
.presets { display: flex; flex-wrap: wrap; gap: 6px; }
.presets button { font-size: 12px; font-weight: 500; padding: 4px 10px; border-radius: 999px; }
.presets button.active { background: var(--primary); border-color: var(--primary); color: var(--primary-text); }

/* ----- Tabs ----- */
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tabs a {
  display: flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: 8px;
  color: var(--muted); text-decoration: none; font-weight: 600; font-size: 14px;
}
.tabs a:hover { background: var(--bg); color: var(--text); }
.tabs a.active { background: var(--bg); color: var(--text); box-shadow: inset 0 -2px 0 var(--primary); }
.actions .spacer { flex: 1; }

/* ----- Tab Bài viết ----- */
main.posts-main {
  max-width: 1400px; grid-template-columns: 240px minmax(0, 1fr) minmax(300px, 400px); align-items: start;
}
@media (max-width: 1180px) {
  main.posts-main { grid-template-columns: minmax(0, 1fr) minmax(280px, 380px); }
  main.posts-main .post-list { grid-column: 1 / -1; }
}
@media (max-width: 820px) { main.posts-main { grid-template-columns: 1fr; } }

.post-list { display: grid; gap: 10px; padding: 12px; }
.post-list ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; max-height: 70vh; overflow: auto; }
.post-list li { display: grid; gap: 2px; padding: 8px 10px; border-radius: 6px; cursor: pointer; border: 1px solid transparent; }
.post-list li b { font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.post-list li .muted { font-size: 12px; }
.post-list li:hover { background: var(--bg); }
.post-list li.active { background: var(--bg); border-color: var(--primary); }
.post-list li.empty { cursor: default; }
@media (max-width: 1180px) { .post-list ul { max-height: 220px; } }

.grid.tight { gap: 6px; }
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
legend { font-size: 13px; font-weight: 600; padding: 0; margin-bottom: 6px; }
legend .muted { font-weight: 400; }
.field-head { display: flex; justify-content: space-between; align-items: baseline; font-size: 13px; }
.counter { font-size: 12px; color: var(--muted); font-variant-numeric: tabular-nums; }
.counter.over { color: var(--err); font-weight: 700; }
.post-editor textarea { min-height: 220px; }

.toolbar { display: flex; gap: 4px; flex-wrap: wrap; }
.toolbar button { padding: 3px 10px; font-size: 13px; font-weight: 500; }

.segmented { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; overflow: hidden; width: fit-content; max-width: 100%; flex-wrap: wrap; }
.segmented label { display: flex; align-items: center; gap: 6px; padding: 6px 12px; font-weight: 500; cursor: pointer; border-right: 1px solid var(--border); }
.segmented label:last-child { border-right: 0; }
.segmented label:has(input:checked) { background: var(--primary); color: var(--primary-text); }
.segmented input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.segmented label:has(input:focus-visible) { outline: 2px solid var(--primary); outline-offset: -2px; }

.post-photo { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.post-photo img { width: 96px; height: 96px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }

.button-row { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr) auto; gap: 8px; align-items: end; }
button.icon { padding: 8px 10px; line-height: 1; }
@media (max-width: 480px) { .button-row { grid-template-columns: 1fr auto; } .button-row label:first-child { grid-column: 1 / -1; } }

.sticky { position: sticky; top: 76px; }
@media (max-width: 820px) { .sticky { position: static; } }

.hints { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; font-size: 13px; }
.hints li { padding: 6px 10px; border-radius: 6px; overflow-wrap: anywhere; }
.hints .error { background: var(--err-bg); color: var(--err); }
.hints .warn { background: var(--warn-bg); margin: 0; }
.hints .muted { background: var(--bg); }

/* Giả lập tin nhắn Telegram có định dạng + button */
.tg-msg { max-width: 340px; display: grid; gap: 4px; }
.tg-msg .tg-bubble { max-width: none; }
.tg-text b { font-weight: 700; }
.tg-text code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; color: #c7254e; }
.tg-text pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; margin: 4px 0;
  background: rgba(127, 127, 127, .12); border-radius: 6px; padding: 6px 8px; white-space: pre-wrap;
}
.tg-text blockquote { margin: 2px 0; padding: 2px 8px; border-left: 3px solid var(--tg-link); background: rgba(22, 138, 205, .08); border-radius: 4px; }
.tg-text .tg-spoiler { background: var(--tg-time); color: transparent; border-radius: 3px; cursor: pointer; }
.tg-text .tg-spoiler:hover { color: inherit; background: rgba(127, 127, 127, .25); }
.tg-entity { color: var(--tg-link); }

.tg-link-card {
  display: grid; gap: 1px; margin: 6px 10px 0; padding: 4px 8px; border-left: 3px solid var(--tg-link);
  background: rgba(22, 138, 205, .08); border-radius: 4px; color: var(--text); text-decoration: none; font-size: 13px;
}
.tg-link-site { color: var(--tg-link); font-weight: 600; }
.tg-link-desc { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.tg-link-card img { width: 100%; border-radius: 6px; margin-top: 4px; max-height: 200px; object-fit: cover; }

.tg-buttons { display: grid; gap: 4px; }
.tg-button {
  display: block; text-align: center; padding: 8px; border-radius: 8px; font-size: 14px; font-weight: 500;
  background: rgba(0, 0, 0, .25); color: #fff; text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.tg-button[href]::after { content: " ↗"; font-size: 11px; opacity: .8; }

.post-list li .schedule-tag { color: var(--ok); }
.post-list li.has-error { border-left: 3px solid var(--err); }