/* Blog Hàng Hóa Plus — theme tối (mặc định theo hệ thống) + sáng, gắn qua html[data-theme] */
:root, :root[data-theme="dark"] {
  --bg: #0b0e11;
  --bg-soft: #12161c;
  --panel: #1e2329;
  --panel2: #2b3139;
  --border: #2b3139;
  --text: #eaecef;
  --text-2: #929aa5;
  --muted: #707a8a;
  --accent: #fcd535;
  --accent-2: #f0b90b;
  --on-accent: #181a20;
  --link: #fcd535;
  --green: #0ecb81;
  --red: #f6465d;
  --code-bg: #0b0e11;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.18);
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f6f4ef;
  --bg-soft: #efece4;
  --panel: #ffffff;
  --panel2: #f1eee6;
  --border: #e0dbcf;
  --text: #1c1f24;
  --text-2: #3a404a;
  --muted: #6b7280;
  --accent: #c9960c;
  --accent-2: #b48300;
  --on-accent: #ffffff;
  --link: #9a6f00;
  --green: #17855a;
  --red: #c93b38;
  --code-bg: #f3f0e8;
  --shadow: 0 1px 2px rgba(30,25,10,.06), 0 8px 24px rgba(30,25,10,.06);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: BinanceNova, "Be Vietnam Pro", -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 16px; line-height: 1.6;
}
a { color: var(--link); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; height: auto; }
h1, h2, h3 { line-height: 1.25; letter-spacing: -0.01em; }
.hidden { display: none !important; }
.invisible { visibility: hidden; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.nowrap { white-space: nowrap; }
.right { text-align: right; }
.num { text-align: right; font-variant-numeric: tabular-nums; }
.center { text-align: center; }
.spacer { flex: 1; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--on-accent); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }
.narrow { max-width: 560px; }
main { min-height: 60vh; padding: 28px 0 56px; }

/* ---------------- Nút ---------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  background: var(--panel2); color: var(--text); border: 1px solid var(--border);
  padding: 9px 16px; border-radius: 10px; cursor: pointer; font: inherit; font-size: 14px;
  font-weight: 500; line-height: 1.2; text-decoration: none !important; white-space: nowrap;
  transition: border-color .15s, background .15s;
}
.btn:hover { border-color: var(--accent); }
.btn-sm { padding: 6px 11px; font-size: 13px; border-radius: 8px; }
.btn-accent { background: var(--accent); color: var(--on-accent); border-color: var(--accent); font-weight: 600; }
.btn-accent:hover { background: var(--accent-2); border-color: var(--accent-2); }
.btn-ghost { background: transparent; }
.btn-danger { color: var(--red); background: transparent; }
.btn-danger:hover { border-color: var(--red); }
.btn-wide { width: 100%; }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center; min-width: 36px; height: 36px;
  padding: 0 8px; border-radius: 9px; border: 1px solid var(--border); background: var(--panel);
  color: var(--text); cursor: pointer; font: inherit; font-size: 14px;
}
.icon-btn:hover { border-color: var(--accent); }
:root[data-theme="dark"] .i-moon, :root:not([data-theme="dark"]) .i-sun { display: none; }

/* ---------------- Header ---------------- */
.site-header {
  position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px); border-bottom: 1px solid var(--border);
}
.header-row { display: flex; align-items: center; gap: 20px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none !important; flex-shrink: 0; }
.brand-mark { color: var(--accent); display: inline-flex; }
.brand-text { font-size: 19px; font-weight: 700; letter-spacing: -0.02em; }
.brand-text b { color: var(--accent); font-weight: 800; }
.brand-sm .brand-text { font-size: 18px; }
.main-nav { display: flex; align-items: center; gap: 4px; flex: 1; min-width: 0; }
.main-nav > a {
  color: var(--text-2); padding: 8px 11px; border-radius: 8px; font-size: 14.5px; font-weight: 500;
  white-space: nowrap; text-decoration: none !important;
}
.main-nav > a:hover { color: var(--text); background: var(--panel2); }
.main-nav > a.active { color: var(--text); background: var(--panel2); }
.main-nav > a.nav-tool { color: var(--accent); display: inline-flex; align-items: center; gap: 6px; }
.nav-search { margin-left: auto; }
.nav-search input { width: 190px; }
.nav-user { display: flex; align-items: center; gap: 8px; }
.user-chip { font-size: 13px; color: var(--muted); max-width: 140px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-toggle { display: none; margin-left: auto; }

/* ---------------- Form ---------------- */
input, textarea, select {
  font: inherit; font-size: 14.5px; color: var(--text); background: var(--panel);
  border: 1px solid var(--border); border-radius: 9px; padding: 9px 12px; width: 100%;
}
input:focus, textarea:focus { outline: none; border-color: var(--accent); }
input[type="checkbox"] { width: auto; accent-color: var(--accent); }
label { display: block; font-size: 13.5px; font-weight: 500; margin: 12px 0 6px; color: var(--text-2); }
label.check { display: flex; align-items: center; gap: 8px; font-weight: 400; }

/* ---------------- Thẻ ---------------- */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); }
.empty { padding: 32px; text-align: center; color: var(--muted); }
.pill { display: inline-block; font-size: 11.5px; font-weight: 600; padding: 2px 8px; border-radius: 99px; background: var(--panel2); color: var(--muted); }
.pill-ok { color: var(--green); background: color-mix(in srgb, var(--green) 14%, transparent); }
.pill-draft { color: var(--muted); border: 1px dashed var(--border); }
.pill-accent { color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); }
.notice { background: color-mix(in srgb, var(--accent) 12%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); padding: 10px 14px; border-radius: 10px; margin-bottom: 20px; }

.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.meta .cat { color: var(--accent); font-weight: 600; text-transform: uppercase; font-size: 11.5px; letter-spacing: .05em; }
.kicker { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: .08em; color: var(--accent); margin-bottom: 8px; }
.kicker a { color: inherit; }

/* ---------------- Hero (bài nổi bật) ---------------- */
.hero { display: grid; grid-template-columns: 1.15fr 1fr; gap: 32px; align-items: center; margin-bottom: 40px; }
.hero-media { display: block; aspect-ratio: 16 / 9; border-radius: 16px; overflow: hidden; background: var(--panel2); border: 1px solid var(--border); }
.hero-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.hero-art { width: 100%; height: 100%; color: var(--accent); display: block; }
.hero-title { font-size: clamp(26px, 3.4vw, 40px); margin: 0 0 14px; font-weight: 800; }
.hero-title a { color: var(--text); }
.hero-excerpt { font-size: 17px; color: var(--text-2); margin: 0 0 16px; }

/* ---------------- Lưới bài viết ---------------- */
.layout { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 32px; align-items: start; }
.section-title { font-size: 20px; margin: 0 0 18px; display: flex; align-items: center; gap: 10px; }
.section-title::before { content: ""; width: 4px; height: 20px; border-radius: 2px; background: var(--accent); }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; }
.post-card { overflow: hidden; display: flex; flex-direction: column; transition: transform .15s, border-color .15s; }
.post-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 50%, var(--border)); }
.thumb { display: block; aspect-ratio: 16 / 9; background: var(--panel2); overflow: hidden; }
.thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.thumb-empty {
  display: flex; align-items: flex-end; padding: 14px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 22%, var(--panel2)), var(--panel2) 70%);
}
.thumb-cat { font-weight: 700; color: var(--accent); font-size: 14px; }
.post-card-body { padding: 16px 18px 20px; }
.post-title { font-size: 17.5px; margin: 8px 0 8px; font-weight: 700; }
.post-title a { color: var(--text); }
.excerpt { margin: 0; color: var(--muted); font-size: 14.5px; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }
.pager { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 28px; }

/* ---------------- Sidebar ---------------- */
.sidebar { display: flex; flex-direction: column; gap: 20px; position: sticky; top: 84px; }
.side-block { padding: 18px 20px; }
.side-title { font-size: 13px; text-transform: uppercase; letter-spacing: .07em; color: var(--muted); margin: 0 0 12px; font-weight: 700; }
.cat-list, .popular-list { margin: 0; padding: 0; list-style: none; }
.cat-list li { display: flex; justify-content: space-between; padding: 7px 0; border-bottom: 1px solid var(--border); font-size: 14.5px; }
.cat-list li:last-child { border-bottom: 0; }
.cat-list a { color: var(--text); }
.popular-list { counter-reset: pop; }
.popular-list li { counter-increment: pop; display: flex; gap: 12px; padding: 8px 0; font-size: 14.5px; line-height: 1.45; }
.popular-list li::before { content: counter(pop); font-weight: 800; color: var(--accent); min-width: 16px; }
.popular-list a { color: var(--text); }
.tool-promo { padding: 22px; background: linear-gradient(160deg, color-mix(in srgb, var(--accent) 16%, var(--panel)), var(--panel) 65%); }
.tool-promo h3 { margin: 0 0 8px; font-size: 21px; }
.tool-promo p { margin: 0 0 16px; color: var(--text-2); font-size: 14.5px; }
.tool-promo-kicker { font-size: 11.5px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .08em; margin-bottom: 6px; }

/* ---------------- Trang danh sách ---------------- */
.page-head { margin-bottom: 26px; }
.page-head h1 { margin: 0 0 6px; font-size: clamp(26px, 3vw, 34px); }
.page-head p { margin: 4px 0 0; }
.row-between { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.row-gap { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.search-big { display: flex; gap: 8px; max-width: 560px; margin: 14px 0 6px; }

/* ---------------- Bài viết ---------------- */
.article-head { margin: 0 0 24px; }
.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 14px; }
.crumbs a { color: var(--muted); }
.article-title { font-size: clamp(28px, 4vw, 44px); margin: 0 0 14px; font-weight: 800; }
.article-lede { font-size: 19px; color: var(--text-2); margin: 0 0 16px; }
.article-cover { margin: 0 0 32px; }
.article-cover img { width: 100%; border-radius: 16px; display: block; border: 1px solid var(--border); }
.article-layout { display: grid; grid-template-columns: minmax(0, 760px) 220px; gap: 40px; justify-content: center; }
.article-layout:not(:has(.toc)) { grid-template-columns: minmax(0, 760px); }
.toc { position: sticky; top: 84px; margin-top: 8px; align-self: start; font-size: 13.5px; border-left: 2px solid var(--border); padding-left: 16px; }
.toc ul { list-style: none; margin: 0; padding: 0; }
.toc ul ul { padding-left: 12px; }
.toc li { margin: 6px 0; }
.toc a { color: var(--muted); }
.toc a:hover { color: var(--text); }
.article-foot { margin: 36px 0 0; display: flex; flex-direction: column; gap: 20px; }
.tags { display: flex; flex-wrap: wrap; gap: 8px; }
.tag { font-size: 13px; padding: 5px 11px; border-radius: 99px; background: var(--panel2); border: 1px solid var(--border); color: var(--text-2); }
.share { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.tool-inline { padding: 18px 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.related { margin-top: 56px; }

/* Nội dung Markdown */
.prose { font-family: "Noto Serif", Georgia, serif; font-size: 18px; line-height: 1.75; color: var(--text); overflow-wrap: break-word; }
.prose > :first-child { margin-top: 0; }
.prose h2, .prose h3, .prose h4 { font-family: "Be Vietnam Pro", sans-serif; margin: 1.8em 0 .6em; scroll-margin-top: 84px; }
.prose h2 { font-size: 26px; }
.prose h3 { font-size: 21px; }
.prose p, .prose ul, .prose ol { margin: 0 0 1.1em; }
.prose li { margin: .3em 0; }
.prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-color: color-mix(in srgb, var(--link) 45%, transparent); }
.prose img { border-radius: 12px; display: block; margin: 1.4em auto; }
.prose blockquote { margin: 1.4em 0; padding: 4px 0 4px 20px; border-left: 3px solid var(--accent); color: var(--text-2); font-style: italic; }
.prose code { font-family: ui-monospace, Consolas, monospace; font-size: .86em; background: var(--code-bg); padding: 2px 6px; border-radius: 5px; border: 1px solid var(--border); }
.prose pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 10px; padding: 16px; overflow-x: auto; font-size: 14px; line-height: 1.55; }
.prose pre code { background: none; border: 0; padding: 0; }
.prose table { width: 100%; border-collapse: collapse; font-family: "Be Vietnam Pro", sans-serif; font-size: 15px; margin: 1.4em 0; display: block; overflow-x: auto; }
.prose th, .prose td { border-bottom: 1px solid var(--border); padding: 9px 12px; text-align: left; }
.prose th { background: var(--panel2); font-weight: 600; }
.prose hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
.prose iframe { max-width: 100%; border: 0; border-radius: 12px; }

/* ---------------- Đăng nhập ---------------- */
.auth-card { padding: 28px; }
.auth-card h1 { margin-top: 0; font-size: 24px; }
.auth-tabs, .editor-tabs { display: flex; gap: 6px; margin-bottom: 14px; align-items: center; }
.auth-tab {
  font: inherit; font-weight: 600; font-size: 14px; padding: 8px 14px; border-radius: 9px; cursor: pointer;
  border: 1px solid var(--border); background: var(--panel2); color: var(--muted);
}
.auth-tab.active { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.auth-form .btn-wide { margin-top: 18px; }
.auth-msg { padding: 10px 14px; border-radius: 9px; margin-bottom: 8px; font-size: 14px; }
.auth-msg.ok { background: color-mix(in srgb, var(--green) 14%, transparent); color: var(--green); }
.auth-msg.err { background: color-mix(in srgb, var(--red) 14%, transparent); color: var(--red); }

/* ---------------- Quản trị ---------------- */
.table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.admin-table th { text-align: left; font-size: 12px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); padding: 12px 14px; border-bottom: 1px solid var(--border); }
.admin-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.admin-table tr:last-child td { border-bottom: 0; }
.admin-table td a b { color: var(--text); }
.editor-grid { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 24px; align-items: start; }
.editor-side { display: flex; flex-direction: column; gap: 16px; }
.editor-side .side-block label:first-of-type { margin-top: 0; }
.title-input { font-size: 26px; font-weight: 700; padding: 12px 14px; }
.slug-row { display: flex; align-items: center; gap: 2px; margin: 8px 0 18px; }
.slug-row input { padding: 4px 8px; font-size: 13px; width: auto; flex: 1; background: transparent; }
.toolbar { display: flex; gap: 4px; flex-wrap: wrap; }
.toolbar .icon-btn { height: 32px; min-width: 32px; font-size: 13px; }
.body-input { min-height: 520px; font-family: ui-monospace, Consolas, monospace; font-size: 14.5px; line-height: 1.65; resize: vertical; }
.preview-pane { min-height: 520px; padding: 20px 24px; background: var(--panel); border: 1px solid var(--border); border-radius: 9px; }
.cover-box img { width: 100%; border-radius: 9px; margin-bottom: 8px; border: 1px solid var(--border); }
.editor-side .row-gap { margin-top: 8px; }

/* ---------------- Footer ---------------- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-soft); padding: 36px 0 20px; }
.footer-grid { display: grid; grid-template-columns: 1fr 1.6fr; gap: 40px; }
.footer-grid p { margin: 8px 0; }
.social-row { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.disclaimer { font-size: 13px; color: var(--muted); }
.disclaimer p { margin: 0 0 8px; }
.disclaimer b { color: var(--text-2); }
.disclaimer-title { font-weight: 700; color: var(--text-2); margin-bottom: 8px; font-size: 14px; }
.copy { margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--border); }
.big-code { font-size: 96px; font-weight: 800; color: var(--accent); line-height: 1; margin-top: 24px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 1280px) {
  .user-chip { display: none; }
}
@media (max-width: 1080px) {
  .nav-search input { width: 140px; }
  .article-layout { grid-template-columns: minmax(0, 760px); }
  .toc { display: none; }
}
@media (max-width: 960px) {
  .layout, .editor-grid { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .hero { grid-template-columns: 1fr; gap: 20px; }
  .nav-toggle { display: inline-flex; }
  .main-nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px; flex-direction: column; align-items: stretch;
    background: var(--panel); border-bottom: 1px solid var(--border); padding: 12px 16px 16px; gap: 2px; box-shadow: var(--shadow);
  }
  .nav-open .main-nav { display: flex; }
  .nav-search { margin: 8px 0; }
  .nav-search input { width: 100%; }
  .nav-user { flex-wrap: wrap; padding-top: 8px; border-top: 1px solid var(--border); }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 560px) {
  main { padding-top: 20px; }
  .post-grid { grid-template-columns: 1fr; }
  .prose { font-size: 17px; }
  .article-lede { font-size: 17px; }
  .admin-table th:nth-child(2), .admin-table td:nth-child(2),
  .admin-table th:nth-child(5), .admin-table td:nth-child(5) { display: none; }
  .body-input, .preview-pane { min-height: 360px; }
}