/* congcuseoai.com — CSS nền. Giữ tối giản; giao diện thật làm ở phase 12. */

:root {
    --bg: #ffffff;
    --fg: #1a1d23;
    --muted: #5b6472;
    --line: #e3e7ee;
    --primary: #2563eb;
    --primary-fg: #ffffff;
    --danger: #dc2626;
    --radius: 8px;
    --maxw: 1080px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
}

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

.site-header, .app-header { border-bottom: 1px solid var(--line); }
.header-inner { display: flex; align-items: center; gap: 24px; padding: 14px 0; flex-wrap: wrap; }
.brand { font-weight: 700; font-size: 1.05rem; text-decoration: none; color: var(--fg); }
.site-nav, .app-nav { display: flex; gap: 18px; align-items: center; margin-left: auto; }

/* Dropdown nav "Nghiên cứu" (phase 14) — thuần CSS hover/focus, không JS. .nav-dropdown-toggle
   là <button> (không phải <a>) vì bản thân nó không điều hướng đi đâu, chỉ mở menu con. */
.nav-dropdown { position: relative; }
.nav-dropdown-toggle {
    background: none; border: none; padding: 0; margin: 0; font: inherit; cursor: pointer;
    color: var(--muted);
}
.nav-dropdown-toggle:hover, .nav-dropdown-toggle:focus { color: var(--fg); }
.nav-dropdown-menu {
    display: none;
    position: absolute; top: 100%; left: 0; margin-top: 10px; min-width: 190px;
    background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
    box-shadow: 0 8px 20px rgba(0, 0, 0, .08); padding: 6px; z-index: 20;
}
.nav-dropdown-menu a { display: block; padding: 8px 10px; border-radius: 6px; white-space: nowrap; }
.nav-dropdown-menu a:hover { background: var(--line); color: var(--fg); }
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu { display: block; }

.app-user { display: flex; gap: 12px; align-items: center; }
.inline-form { display: inline; margin: 0; }
.hidden-form { display: none; }

a { color: var(--primary); }
nav a { text-decoration: none; color: var(--muted); }
nav a:hover { color: var(--fg); }

.credits {
    padding: 4px 10px; border: 1px solid var(--line); border-radius: 999px;
    font-variant-numeric: tabular-nums; text-decoration: none; color: var(--fg);
}

.btn {
    display: inline-block; padding: 9px 16px; border-radius: var(--radius);
    border: 1px solid transparent; text-decoration: none; cursor: pointer;
    font-size: 0.95rem; font-family: inherit;
}
.btn-primary { background: var(--primary); color: var(--primary-fg); }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--fg); }
.btn-lg { padding: 12px 22px; font-size: 1.05rem; }

.hero { padding: 64px 0 40px; max-width: 720px; }
.hero h1 { font-size: 2.3rem; line-height: 1.25; margin: 0 0 16px; }
.lead { font-size: 1.1rem; color: var(--muted); }

.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 20px; padding: 24px 0 64px; }
.features article { border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; }
.features h2 { font-size: 1.05rem; margin: 0 0 8px; }
.features p { margin: 0; color: var(--muted); font-size: 0.95rem; }

.error-page { padding: 80px 0; text-align: center; }
.error-code { font-size: 4rem; font-weight: 700; color: var(--muted); margin: 0; line-height: 1; }
.error-page h1 { margin: 8px 0 12px; }

.debug-box {
    margin-top: 32px; text-align: left; background: #1e1e2e; color: #f8f8f2;
    padding: 16px; border-radius: var(--radius); overflow: auto;
}
.debug-box pre { font-size: 0.78rem; white-space: pre-wrap; word-break: break-word; }

.app-main { padding: 28px 0 64px; }

.site-footer { border-top: 1px solid var(--line); padding: 28px 0; color: var(--muted); font-size: 0.9rem; }
.footer-links a { margin-right: 16px; }

/* ── Đăng nhập ─────────────────────────────────────────────────────────────── */
.auth-box { max-width: 460px; margin: 64px auto; text-align: center; }
.fine-print { font-size: 0.85rem; color: var(--muted); }

.alert { padding: 12px 14px; border-radius: var(--radius); border: 1px solid var(--line); text-align: left; }
.alert-warning { background: rgba(217, 119, 6, 0.1); border-color: rgba(217, 119, 6, 0.4); }
.alert-danger  { background: rgba(220, 38, 38, 0.1); border-color: rgba(220, 38, 38, 0.4); }

.notice { border: 1px solid var(--line); border-left: 3px solid var(--primary); border-radius: var(--radius); padding: 16px 18px; }

/* ── Quản trị ──────────────────────────────────────────────────────────────── */
.muted { color: var(--muted); }
.btn-danger { background: var(--danger); color: #fff; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; margin: 20px 0 36px; }
.stat { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; color: var(--muted); font-size: 0.9rem; }
.stat-num { display: block; font-size: 1.7rem; font-weight: 700; color: var(--fg); font-variant-numeric: tabular-nums; }

/* Kết quả gom cụm (/app/cum-chu-de, phase 14) — mỗi cụm một khối, bảng con bên trong dùng lại
   .table-scroll/.data-table đã có sẵn ở dưới. */
.cluster-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin-bottom: 14px; }
.cluster-card-head { display: flex; gap: 10px; align-items: center; cursor: pointer; margin-bottom: 6px; }
.cluster-card-head input[type="checkbox"] { width: 16px; height: 16px; flex-shrink: 0; }

.search-form { display: flex; gap: 8px; margin: 16px 0 24px; }
.search-form input { flex: 1; max-width: 340px; padding: 9px 12px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }

/* Bảng rộng phải cuộn trong khung của chính nó, không được đẩy cả trang trượt ngang. */
.table-scroll { overflow-x: auto; }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
.data-table th, .data-table td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--line); white-space: nowrap; }
.data-table th { color: var(--muted); font-weight: 600; }
.data-table td.num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table code { font-size: 0.85rem; }

.tag { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 0.8rem; border: 1px solid var(--line); }
.tag-ok    { background: rgba(22, 163, 74, 0.12); border-color: rgba(22, 163, 74, 0.4); }
.tag-bad   { background: rgba(220, 38, 38, 0.12); border-color: rgba(220, 38, 38, 0.4); }
.tag-admin { background: rgba(37, 99, 235, 0.12); border-color: rgba(37, 99, 235, 0.4); }

.pager { display: flex; gap: 16px; align-items: center; margin-top: 18px; }

.detail-list { display: grid; grid-template-columns: max-content 1fr; gap: 6px 20px; margin: 18px 0 26px; }
.detail-list dt { color: var(--muted); }
.detail-list dd { margin: 0; }

.action-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 6px; }

/* ── Credit & bảng giá ─────────────────────────────────────────────────────── */
.alert-ok { background: rgba(22, 163, 74, 0.1); border-color: rgba(22, 163, 74, 0.4); }

.amount-in  { color: #16a34a; }
.amount-out { color: var(--danger); }
.margin-bad { color: var(--danger); font-weight: 700; }

.preset-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 12px; margin: 16px 0 24px; }
.preset { display: block; border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; cursor: pointer; }
.preset:has(input:checked) { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary) inset; }
.preset-amount { display: block; font-weight: 700; font-size: 1.1rem; }
.preset-credits { display: block; color: var(--muted); font-size: 0.88rem; }

fieldset { border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; }
fieldset[disabled] { opacity: 0.55; }
legend { padding: 0 6px; color: var(--muted); font-size: 0.9rem; }

.cell-input { width: 96px; padding: 5px 8px; border: 1px solid var(--line); border-radius: 6px; background: var(--bg); color: var(--fg); font: inherit; }
td .cell-input[type="text"] { width: 180px; }

.new-pair { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.new-pair input { padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }
.new-pair legend { width: 100%; }

.adjust-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin: 12px 0 4px; }
.adjust-form input { padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }
.adjust-form input[type="text"] { min-width: 260px; }

.pager a.active { font-weight: 700; color: var(--fg); }

.redirect-box { padding: 80px 0; text-align: center; }

/* Hang doi job */
.status-chips { display: flex; gap: 10px; flex-wrap: wrap; margin: 16px 0; }

.progress-bar { height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; min-width: 110px; }
.progress-bar > span { display: block; height: 100%; background: var(--primary); transition: width 0.4s ease; }

.status-pending { opacity: 0.75; }
.status-running { border-color: var(--primary); }
.status-failed  { color: var(--danger); border-color: var(--danger); }

.job-detail-row > td { padding-top: 0; border-top: 0; }
.job-detail-row summary { cursor: pointer; font-size: 0.88rem; }
.job-error { color: var(--danger); }
.job-detail-row pre {
    white-space: pre-wrap; word-break: break-word; margin: 6px 0 0;
    padding: 10px; border-radius: var(--radius); background: var(--line);
    font-size: 0.82rem; max-height: 260px; overflow: auto;
}

.note-list { margin: 0 0 20px; padding-left: 20px; }
.note-list li { margin-bottom: 5px; }

/* Nghien cuu SERP */
.research-block {
    white-space: pre-wrap; word-break: break-word; margin: 8px 0 20px;
    padding: 14px; border-radius: var(--radius); border: 1px solid var(--line);
    background: var(--line); font-size: 0.85rem; max-height: 420px; overflow: auto;
}
.job-track { margin: 16px 0; max-width: 480px; }
.job-track .progress-bar { margin-bottom: 6px; }

/* Du an & ho so viet bai */
.tab-nav { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--line); margin: 20px 0 24px; }
.tab-nav a { padding: 9px 16px; border: 1px solid transparent; border-bottom: 0; border-radius: var(--radius) var(--radius) 0 0; color: var(--muted); text-decoration: none; margin-bottom: -1px; }
.tab-nav a:hover { color: var(--fg); }
.tab-nav a.active { border-color: var(--line); background: var(--bg); color: var(--fg); font-weight: 600; }

.stack-form { max-width: 680px; }
.field { display: block; margin-bottom: 18px; }
.field > span:first-child { display: block; margin-bottom: 5px; font-weight: 600; font-size: 0.94rem; }
.field input[type="text"], .field input[type="url"], .field input[type="number"],
.field input[type="email"], .field select, .field textarea {
    width: 100%; padding: 9px 11px; border: 1px solid var(--line); border-radius: var(--radius);
    background: var(--bg); color: var(--fg); font: inherit;
}
.field textarea { resize: vertical; }
.field small { display: block; margin-top: 5px; }
.required { color: var(--danger); }

.toggle-group { display: grid; gap: 12px; margin-bottom: 20px; }
.toggle { display: flex; gap: 10px; align-items: flex-start; cursor: pointer; }
.toggle input { margin-top: 3px; }

.swatches { display: inline-flex; gap: 6px; margin-top: 8px; }
.swatch { width: 26px; height: 26px; border-radius: 6px; border: 1px solid var(--line); display: inline-block; }

.row-active { background: rgba(37, 99, 235, 0.06); }
.btn-danger { border-color: var(--danger); color: var(--danger); }

.adjust-form select, .new-pair select {
    padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius);
    background: var(--bg); color: var(--fg); font: inherit;
}

@media (prefers-color-scheme: dark) {
    :root { --bg: #14161a; --fg: #e7e9ee; --muted: #99a2b0; --line: #262b33; }
}

/* Viet bai AI (phase 08) */
.btn-small { padding: 5px 10px; font-size: 0.85rem; }

.write-layout { display: grid; grid-template-columns: 220px 1fr; gap: 28px; align-items: start; }
.write-sidebar { border-right: 1px solid var(--line); padding-right: 20px; }
.write-sidebar ul { list-style: none; margin: 0; padding: 0; }
.write-sidebar li { margin-bottom: 10px; font-size: 0.9rem; }
.write-sidebar li.active a { font-weight: 700; color: var(--fg); }
.write-sidebar a { text-decoration: none; color: var(--muted); }
.write-sidebar a:hover { color: var(--fg); }

.ctx-lights { display: flex; gap: 14px; margin: 10px 0 6px; flex-wrap: wrap; }
.ctx-light {
    display: inline-flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--muted);
}
.ctx-light::before {
    content: ""; width: 9px; height: 9px; border-radius: 999px; background: var(--line); display: inline-block;
}
.ctx-light.is-on { color: var(--fg); }
.ctx-light.is-on::before { background: #16a34a; }

.outline-item {
    border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; margin-bottom: 12px;
    display: flex; flex-direction: column; gap: 8px; background: var(--bg);
}
.outline-item--h3 { margin-left: 24px; border-style: dashed; }
.outline-children { margin-top: 6px; }
.outline-drag-handle { cursor: grab; color: var(--muted); user-select: none; }
.outline-field input { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }
.outline-item textarea { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; resize: vertical; }
.outline-word-estimate { width: 100px; padding: 6px 8px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }
.outline-item-actions { display: flex; gap: 8px; justify-content: flex-end; }
.outline-intro { border: 1px dashed var(--line); border-radius: var(--radius); padding: 12px; margin-bottom: 16px; }
.outline-intro textarea { width: 100%; padding: 8px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }

.editor-body {
    min-height: 420px; border: 1px solid var(--line); border-radius: var(--radius); padding: 18px;
    background: var(--bg); line-height: 1.7;
}
.editor-body:focus { outline: 2px solid var(--primary); outline-offset: 2px; }
.editor-toolbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }

.lint-findings { margin: 10px 0 0; padding-left: 20px; }
.lint-findings li { margin-bottom: 4px; font-size: 0.9rem; }
.lint-clean { color: #16a34a; font-size: 0.9rem; }

.link-candidate-row { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.link-candidate-row span { flex: 0 0 220px; font-size: 0.9rem; }
.link-candidate-url { flex: 1; padding: 7px 10px; border: 1px solid var(--line); border-radius: var(--radius); background: var(--bg); color: var(--fg); font: inherit; }

.model-remain { color: var(--muted); font-size: 0.82rem; }

/* Tao anh AI (phase 09) */
.image-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin: 16px 0 28px; }
.image-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; background: var(--bg); }
.image-card img { width: 100%; height: 150px; object-fit: cover; border-radius: 6px; background: var(--line); display: block; }
.image-card-prompt { font-size: 0.82rem; color: var(--muted); margin: 8px 0; max-height: 3.2em; overflow: hidden; }
.image-card-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.image-empty { color: var(--muted); }

.storage-bar { height: 8px; border-radius: 999px; background: var(--line); overflow: hidden; max-width: 320px; margin: 6px 0; }
.storage-bar > span { display: block; height: 100%; background: var(--primary); transition: width 0.4s ease; }
.storage-bar.is-near-full > span { background: var(--danger); }

/* Blog & trang marketing (phase 12) */
.breadcrumb { font-size: 0.88rem; color: var(--muted); margin: 20px 0 0; }
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--fg); }

.blog-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 24px; margin: 24px 0 8px; }
.blog-card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg); display: flex; flex-direction: column; }
.blog-card-thumb { display: block; aspect-ratio: 16 / 9; background: var(--line); }
.blog-card-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.blog-card-thumb--empty { background: linear-gradient(135deg, var(--line), var(--bg)); }
.blog-card-body { padding: 16px; }
.blog-card-date { display: block; font-size: 0.8rem; color: var(--muted); margin-bottom: 6px; }
.blog-card-title { font-size: 1.05rem; margin: 0 0 8px; line-height: 1.35; }
.blog-card-title a { color: var(--fg); text-decoration: none; }
.blog-card-title a:hover { color: var(--primary); }
.blog-card-excerpt {
    margin: 0; color: var(--muted); font-size: 0.9rem;
    display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.post { max-width: 760px; margin: 24px auto 0; }
.post-header h1 { font-size: 2rem; line-height: 1.3; margin: 12px 0 10px; }
.post-meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 12px; }
.tag-chip-list { display: flex; flex-wrap: wrap; gap: 8px; margin: 0 0 8px; }
.tag-chip-list .tag { text-decoration: none; color: var(--fg); }
.tag-chip-list .tag:hover { border-color: var(--primary); color: var(--primary); }

/* Typography cho nội dung đã qua HtmlSanitizer — phải hỗ trợ đúng tập thẻ trong
   HtmlSanitizer::ALLOWED (p/br/strong/b/em/i/u/s/h2-h4/ul/ol/li/blockquote/a/img/code/pre/
   figure/figcaption/table+thead+tbody+tr+th+td/hr). */
.post-body { max-width: 760px; margin: 20px auto 0; line-height: 1.75; font-size: 1.02rem; }
.post-body h2 { font-size: 1.5rem; margin: 36px 0 14px; }
.post-body h3 { font-size: 1.25rem; margin: 28px 0 12px; }
.post-body h4 { font-size: 1.08rem; margin: 22px 0 10px; }
.post-body p { margin: 0 0 16px; }
.post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 24px; }
.post-body li { margin-bottom: 6px; }
.post-body blockquote {
    margin: 0 0 16px; padding: 4px 18px; border-left: 3px solid var(--primary);
    color: var(--muted); font-style: italic;
}
.post-body a { color: var(--primary); }
.post-body img { max-width: 100%; height: auto; border-radius: var(--radius); display: block; margin: 8px auto; }
.post-body figure { margin: 0 0 16px; }
.post-body figcaption { text-align: center; font-size: 0.85rem; color: var(--muted); margin-top: 6px; }
.post-body code {
    background: var(--line); border-radius: 4px; padding: 2px 6px; font-size: 0.88em;
    font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
}
.post-body pre {
    background: var(--line); border-radius: var(--radius); padding: 14px; overflow-x: auto; margin: 0 0 16px;
}
.post-body pre code { background: none; padding: 0; }
.post-body hr { border: 0; border-top: 1px solid var(--line); margin: 28px 0; }
/* table không có class .data-table (nội dung tự do do admin nhập) — display:block cho phép
   cuộn ngang trên chính thẻ table, không cần bọc thêm div wrapper. */
.post-body table { display: block; overflow-x: auto; border-collapse: collapse; width: 100%; margin: 0 0 16px; font-size: 0.92rem; }
.post-body th, .post-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; }
.post-body th { background: var(--line); font-weight: 600; }

.post-nav { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; max-width: 760px; margin: 32px auto 0; }
.post-nav-link { border: 1px solid var(--line); border-radius: var(--radius); padding: 12px 14px; text-decoration: none; color: var(--fg); font-size: 0.92rem; }
.post-nav-link:hover { border-color: var(--primary); }
.post-nav-next { text-align: right; grid-column: 2; }

.related-posts { max-width: 760px; margin: 48px auto 0; }
.related-posts h2 { font-size: 1.3rem; }

/* Admin blog */
.stack-form.blog-form { max-width: 860px; }
.og-preview { display: block; margin-top: 10px; max-width: 240px; max-height: 140px; object-fit: cover; border-radius: var(--radius); border: 1px solid var(--line); }
.media-url-input { width: 100%; font-size: 0.78rem; margin: 8px 0; }