/* =====================================================================
   post.css — Giao diện trang bài viết (hero, thanh thao tác, nội dung,
   mục lục, bài liên quan). Nạp sau article.css + home.css ở posts/show.
   ===================================================================== */
:root:not([data-theme="dark"]) .is-post{
  --ink:#101b3e;--ink-2:#3f4e6b;--ink-3:#7888a2;--line-soft:#e7eef8;--surface:#fff;
  background:radial-gradient(ellipse at 85% 8%,#e9f3ff80,transparent 40%),#f7faff;
}
.pt-wrap{width:calc(100% - 136px);max-width:1180px;margin:0 auto;padding:24px 0 0;}
.pt-symbols{position:absolute;width:0;height:0;overflow:hidden;}
.pt-icon{display:block;width:20px;height:20px;flex-shrink:0;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.is-post .draft-note{background:#FEF3C7;border:1px solid #F59E0B;color:#92400E;font-family:var(--mono);font-size:12.5px;padding:10px 14px;border-radius:10px;margin:0 0 14px;}
.is-post .lang-fallback{background:color-mix(in srgb,var(--acc) 9%,var(--sheet));border:1px solid color-mix(in srgb,var(--acc) 28%,var(--line));
  color:var(--ink-2);font-size:13px;padding:9px 14px;border-radius:10px;margin:0 0 14px;}
/* ---------- HERO ---------- */
.pt-hero{
  position:relative;overflow:hidden;isolation:isolate;
  display:flex;align-items:center;
  min-height:320px;padding:30px 38px;border-radius:16px;
  border:1px solid color-mix(in srgb,var(--hm-primary) 7%,var(--line-soft));
  background:
    radial-gradient(60% 100% at 100% 60%,color-mix(in srgb,var(--hm-primary) 13%,transparent),transparent 80%),
    linear-gradient(110deg,var(--surface),color-mix(in srgb,#b7d8ff 38%,var(--surface)));
}
.pt-kicker{
  display:inline-flex;align-items:center;gap:8px;margin:0 0 13px;padding:5px 9px;border-radius:7px;
  font-family:var(--sans);font-size:10.5px;font-weight:600;letter-spacing:.015em;text-transform:uppercase;
  color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 10%,var(--surface));
}
.pt-kicker .pt-icon{width:14px;height:14px;}
.pt-hero h1{margin:0 0 10px;font-size:clamp(28px,3vw,40px);line-height:1.13;font-weight:800;letter-spacing:-.035em;color:var(--ink);text-wrap:balance;}
.pt-lead{margin:0;font-size:clamp(14px,1.3vw,17px);line-height:1.55;color:var(--ink-2);max-width:46ch;}
.pt-meta{list-style:none;padding:0;margin:19px 0 0;display:flex;flex-wrap:wrap;gap:8px 10px;max-width:100%;}
.pt-meta li{display:inline-flex;}
/* PC: các tag luôn nằm 1 hàng, được tràn qua vùng ảnh bên phải */
@media (min-width:1101px){
  .pt-meta{flex-wrap:nowrap;width:max-content;max-width:none;}
  .pt-meta li,.pt-meta a{white-space:nowrap;}
}
.pt-meta li,.pt-meta a{
  align-items:center;gap:7px;padding:5px 10px;border-radius:6px;
  font-size:11px;line-height:1.4;color:var(--ink-2);text-decoration:none;
  background:color-mix(in srgb,var(--surface) 86%,transparent);border:1px solid var(--line-soft);
}
.pt-meta li:has(> a){padding:0;border:0;background:none;}
.pt-meta a{display:inline-flex;transition:color .15s,border-color .15s;}
.pt-meta a:hover{color:var(--hm-primary);border-color:var(--hm-primary);}
.pt-meta .pt-icon{color:var(--hm-primary);width:15px;height:15px;}
.pt-meta .pt-author-icon{color:#f58924;}
.pt-meta .pt-comment-icon{color:#9571fc;}
/* Phần chữ: rộng hơn nửa khung, tràn sang đè lên ảnh bên phải */
.pt-hero-copy{position:relative;z-index:1;width:63%;max-width:700px;}
/* Ảnh minh họa phủ ~2/3 phải khung (ảnh bìa nếu có, không thì robot trong ảnh header),
   mép trái mờ dần vào nền để chữ đè lên vẫn dễ đọc */
.pt-hero-art{
  position:absolute;top:0;right:0;bottom:0;width:64%;z-index:0;
  background:url('../images/categories/data-structure-and-algorithms.jpg') 87% center / auto 110% no-repeat;
  -webkit-mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 22%,#000 48%);
          mask-image:linear-gradient(90deg,transparent 0%,rgba(0,0,0,.35) 22%,#000 48%);
}
/* Only the decorative hero illustration is displayed from the supplied topic reference. */
.pt-hero-art.pt-art-pointers{background-image:url('../images/articles/topic-sprite.png');background-size:241.28% 679.67%;background-position:88.2% 4.21%;}
.pt-hero-art.has-cover{background:none;}
.pt-hero-art img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;}
/* ---------- NỘI DUNG + SIDEBAR, THANH THAO TÁC NGOÀI LỀ ---------- */
.is-post .article-shell{
  position:relative;max-width:none;margin:0;padding:0;
  display:grid;grid-template-columns:minmax(0,1fr) clamp(210px,23vw,280px);gap:20px;align-items:start;
}
/* Thanh thao tác */
.pt-rail-wrap{position:absolute;top:4px;bottom:0;left:-57px;width:46px;}
.pt-rail{
  position:sticky;top:84px;display:flex;flex-direction:column;gap:6px;padding:8px 3px;
  background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;box-shadow:0 4px 20px #8095b808;
  margin-top: 18px;
}
.pt-act{
  display:flex;flex-direction:column;align-items:center;gap:4px;padding:9px 2px;border:0;border-radius:10px;
  background:none;color:var(--ink-2);cursor:pointer;font-family:var(--sans);font-size:9px;line-height:1.2;
  transition:color .15s,background .15s;
}
.pt-act .pt-icon{width:20px;height:20px;}
.pt-act[aria-pressed="true"] .pt-icon{fill:color-mix(in srgb,currentColor 20%,transparent);}
.pt-act:focus-visible{outline:2px solid var(--hm-primary);outline-offset:1px;}
.pt-act:hover{color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 8%,transparent);}
.pt-act[data-act="like"][aria-pressed="true"]{color:#ef4444;}
.pt-act[data-act="save"][aria-pressed="true"]{color:var(--hm-primary);}
.pt-act.ok{color:#10b981;}
/* Nội dung */
.is-post .article-sheet{
  background:var(--surface);border:0;border-radius:16px;
  padding:28px 34px 32px;box-shadow:0 8px 35px #7193bf05;
  margin-top: 22px;
}
:root:not([data-theme="dark"]) .is-post .article-sheet{background:#fff;}
/* ===== Chữ & khoảng cách ===== */
.is-post .article-body{font-size:15px;line-height:1.65;color:var(--ink-2);overflow-wrap:anywhere;}
.is-post .article-body > :first-child{margin-top:0;}
.is-post :where(.article-body) p{margin:12px 0;}
.is-post :where(.article-body) b,.is-post :where(.article-body) strong{color:var(--ink);font-weight:700;}
.is-post :where(.article-body) h2{font-size:clamp(24px,2.5vw,32px);line-height:1.2;font-weight:800;color:var(--ink);letter-spacing:-.025em;margin:32px 0 13px;}
.is-post :where(.article-body) h3{font-size:clamp(18px,2vw,20px);line-height:1.35;font-weight:700;color:var(--ink);margin:28px 0 8px;}
.is-post :where(.article-body) ul,.is-post :where(.article-body) ol{margin:10px 0;padding-left:22px;}
.is-post :where(.article-body) li{margin:3px 0;}
.is-post :where(.article-body) li::marker{color:var(--ink);}
.is-post :where(.article-body) a{color:var(--hm-primary);}
.is-post :where(.article-body) hr{border-top-color:var(--line-soft);}
.is-post :not(pre) > code{background:color-mix(in srgb,var(--hm-primary) 4%,var(--surface));border:1px solid var(--line-soft);border-radius:5px;padding:1px 5px;font-size:.86em;color:var(--ink);}

/* ===== Trích dẫn ===== */
.is-post :where(.article-body) blockquote{
  position:relative;margin:0 0 20px;padding:15px 18px 15px 51px;border-radius:9px;
  border:1px solid color-mix(in srgb,var(--hm-primary) 7%,var(--line-soft));border-left:2px solid var(--hm-primary);
  background:linear-gradient(120deg,color-mix(in srgb,var(--hm-primary) 5%,var(--surface)),color-mix(in srgb,var(--hm-primary) 2%,var(--surface)));
  color:var(--ink-2);font-size:14.5px;line-height:1.6;
}
.is-post :where(.article-body) blockquote::before{
  content:"\201C";position:absolute;left:15px;top:14px;width:25px;height:27px;border-radius:8px;background:#e2efff;
  font-size:37px;line-height:1.15;text-align:center;font-weight:800;color:var(--hm-primary);font-family:Georgia,serif;
}
.is-post :where(.article-body) blockquote p{margin:0;}

/* ===== Đầu mục lớn "PART A" + tiêu đề nhóm ===== */
.is-post .sec-head{margin:54px 0 16px;}
.is-post .sec-head .eyebrow,.is-post .part-divider{
  display:inline-flex;align-items:center;margin:0 0 10px;padding:4px 11px;border:0;border-radius:999px;
  font-family:var(--sans);font-size:11.5px;font-weight:700;letter-spacing:.07em;text-transform:uppercase;
  color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 10%,var(--surface));
}
.is-post .part-divider{margin-top:50px;}
.is-post .sec-head h2{margin:0;font-size:clamp(25px,2.9vw,32px);}
.is-post .sec-head p{margin:8px 0 0;color:var(--ink-3);}

/* ===== Khối code ===== */
.is-post .code-block{margin:14px 0;border:1px solid #28364c;border-radius:11px;overflow:hidden;box-shadow:0 5px 14px #1d2e4710;}
.is-post .code-bar{background:linear-gradient(100deg,#1d2c43,#1c2940);padding:9px 12px 9px 16px;border-bottom:1px solid rgba(255,255,255,.06);}
.is-post .code-lang{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-size:13px;font-weight:600;letter-spacing:0;text-transform:none;color:#e2e8f0;}
.is-post .code-lang i{font-size:16px;color:#7cb3ff;}
.is-post .code-lang i.fa-python{color:#ffd43b;}
.is-post .code-copy{font-family:var(--sans);font-size:12px;border-radius:8px;padding:5px 10px;}
.is-post .code-tab{font-family:var(--sans);text-transform:none;letter-spacing:0;font-size:12.5px;}
.is-post .code-body,.is-post .code-panels,.is-post .code-block pre{background:#171f2d;}
.is-post .code-gutter{background:#182231;color:#637a9a;}
.is-post .code-block pre{font-size:12px;line-height:1.65;}
.is-post pre{border-radius:14px;margin:20px 0;}
.is-post .code-block pre{border-radius:0;margin:0;}

/* ===== Bảng ===== */
.is-post .table-scroll{margin:18px 0;border:1px solid var(--line-soft);border-radius:14px;background:var(--surface);}
.is-post table.decide th,.is-post table.decide td{padding:13px 16px;border-bottom:1px solid var(--line-soft);}
.is-post table.decide thead th{font-family:var(--sans);font-size:12px;font-weight:700;letter-spacing:.04em;color:var(--ink-2);
  background:color-mix(in srgb,var(--hm-primary) 4%,var(--surface));}
.is-post table.decide td{font-size:14.5px;}

/* ===== Hộp ghi nhớ / Key takeaway ===== */
.is-post .hook{
  margin:16px 0;padding:16px 18px 16px 49px;border-radius:10px;
  background:linear-gradient(110deg,color-mix(in srgb,var(--hm-primary) 5%,var(--surface)),color-mix(in srgb,var(--hm-primary) 13%,var(--surface)));
  border:1px solid color-mix(in srgb,var(--hm-primary) 12%,var(--line-soft));border-left:2px solid var(--hm-primary);
}
.is-post .hook::before{left:18px;top:15px;font-size:18px;}
.is-post .hook .h-lab{font-family:var(--sans);font-size:14.5px;font-weight:700;letter-spacing:0;text-transform:none;color:var(--hm-primary);margin-bottom:6px;}
.is-post .hook p{font-weight:400;color:var(--ink-2);}
.is-post .hook ul{list-style:none;margin:6px 0 0;padding:0;}
.is-post .hook li{position:relative;padding-left:28px;margin:7px 0;}
.is-post .hook li::before{content:"\2713";position:absolute;left:0;top:3px;width:18px;height:18px;border-radius:50%;
  display:grid;place-items:center;font-size:11px;font-weight:800;color:#fff;background:var(--hm-primary);}

/* ===== Sơ đồ mảng / thẻ pattern / chip điều hướng ===== */
.is-post .viz{margin:20px 0;padding:24px 20px 18px;border-radius:14px;border:1px solid var(--line-soft);
  background:color-mix(in srgb,var(--hm-primary) 3%,var(--surface));}
.is-post .cell{width:44px;height:44px;border-radius:9px;border:1px solid color-mix(in srgb,var(--hm-primary) 22%,var(--line-soft));
  background:var(--surface);font-size:15px;font-weight:600;}
.is-post .cell.win{background:color-mix(in srgb,var(--hm-primary) 14%,var(--surface));border-color:var(--hm-primary);}
.is-post .cell.edge{border:2px solid var(--hm-primary);}
.is-post .cell.hit{background:var(--hm-primary);border-color:var(--hm-primary);}
.is-post .mark{font-family:var(--sans);font-weight:700;color:var(--hm-primary);}
.is-post .viz-cap{font-family:var(--sans);font-size:13px;color:var(--ink-3);text-align:center;}
.is-post .pattern{border:1px solid var(--line-soft);border-top:4px solid var(--hm-primary);border-radius:16px;padding:26px 26px 28px;}
.is-post .confuse,.is-post .step{border:1px solid var(--line-soft);border-radius:14px;}
.is-post .nav a{border-radius:10px;font-family:var(--sans);font-size:13px;}
.is-post .block-label{font-family:var(--sans);font-weight:700;letter-spacing:.06em;}
.is-post ul.signals li{border-bottom-color:var(--line-soft);}
.is-post .algo-viz{border-color:var(--line-soft);border-radius:14px;}
.pt-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:30px;padding-top:20px;border-top:1px solid var(--line-soft);}
/* Bình luận */
.is-post .comments{background:var(--surface);border:1px solid var(--line-soft);border-radius:18px;margin-top:22px;}
:root:not([data-theme="dark"]) .is-post .comments{background:#fff;}
/* ---------- SIDEBAR ---------- */
.is-post .article-toc{top:84px;margin-top:22px;max-height:calc(1000vh - 10px);
  overflow:visible;display:flex;flex-direction:column;gap:12px;}
.is-post .article-toc > .pt-card{flex-shrink:0;}
/* Chỉ danh sách mục lục được cuộn; khối promo bên dưới luôn đứng yên */
.is-post .article-toc > #toc-block{flex-shrink:1;min-height:0;display:flex;flex-direction:column;}
.is-post #toc-block .pt-card-title{flex-shrink:0;}
.is-post .toc-scroll{min-height:0;overflow-y:auto;overscroll-behavior:contain;
  margin:0 -8px;padding:0 8px; /* chừa chỗ cho vạch active (left:-7px) không bị cắt */
  scrollbar-width:thin;scrollbar-color:var(--line) transparent;}
.is-post .toc-scroll::-webkit-scrollbar{width:5px;}
.is-post .toc-scroll::-webkit-scrollbar-thumb{background:var(--line);border-radius:5px;}
/* Màn hình thấp: ẩn promo để nhường chỗ cho mục lục */
@media (max-height:700px){ .is-post .article-toc .pt-promo{display:none;} }
.pt-card{background:var(--surface);border:1px solid var(--line-soft);border-radius:16px;padding:18px 16px;}
:root:not([data-theme="dark"]) .pt-card{background:#fff;}
.pt-card-title{display:flex;align-items:center;gap:10px;margin:0 0 12px;font-size:15px;font-weight:800;color:var(--ink);}
.pt-card-title i{color:var(--hm-primary);}
/* Contents: one continuous track, with indented labels for subsections. */
.is-post #toc-block{
  --toc-line:#e9eef6;--toc-dot:#cbd5e5;--toc-group:#34435d;--toc-text:#75839b;
  --toc-active:#edf4ff;--toc-blue:#2475ff;
  padding:20px 8px 14px;border:0;border-radius:16px;
  box-shadow:0 6px 28px #a6bbd510;
}
.is-post #toc-block .pt-card-title{gap:9px;margin:0 12px 14px;font-size:15px;font-weight:700;color:#162441;}
.pt-toc-icon{width:19px;height:19px;flex-shrink:0;fill:none;stroke:var(--toc-blue);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;}
.is-post #toc-list{position:relative;display:flex;flex-direction:column;gap:0;padding:0;border:0;}
.is-post #toc-list::before{content:"";position:absolute;left:16px;top:15px;bottom:15px;width:1px;background:var(--toc-line);}
.is-post #toc-list a{
  position:relative;display:block;flex-shrink:0;margin:0;padding:6px 9px 6px 31px;border:0;border-radius:5px;
  color:var(--toc-group);font-size:12.5px;line-height:1.5;font-weight:650;text-decoration:none;overflow-wrap:anywhere;
  transition:color .15s,background .15s;
}
.is-post #toc-list a::before{
  content:"";position:absolute;left:13px;top:12px;width:7px;height:7px;box-sizing:border-box;
  border:1px solid var(--surface);border-radius:50%;background:#b4c2d8;
}
.is-post #toc-list a.grp:not(:first-child){margin-top:12px;}
.is-post #toc-list a.sub{padding-left:37px;font-weight:400;color:var(--toc-text);}
.is-post #toc-list a.sub::before{left:13.5px;top:12.5px;width:6px;height:6px;background:var(--toc-dot);}
.is-post #toc-list a:hover{color:var(--toc-blue);background:color-mix(in srgb,var(--toc-active) 65%,transparent);}
.is-post #toc-list a.active{color:var(--toc-blue);background:var(--toc-active);font-weight:600;}
.is-post #toc-list a.active::before{background:var(--toc-blue);border-color:var(--toc-active);}
.is-post #toc-list a.active::after{content:"";position:absolute;left:-7px;top:0;bottom:0;width:3px;border-radius:3px;background:var(--toc-blue);}
.is-post #toc-list a:focus-visible{outline:2px solid var(--toc-blue);outline-offset:-2px;}
:root[data-theme="dark"] .is-post #toc-block{
  --toc-line:#2a374d;--toc-dot:#53647e;--toc-group:#dbe5f5;--toc-text:#a0aec4;--toc-active:#1a3151;--toc-blue:#7ab2ff;
  box-shadow:none;
}
:root[data-theme="dark"] .is-post #toc-block .pt-card-title{color:var(--ink);}
:root[data-theme="dark"] .is-post #toc-list a.grp::before{background:#8294b0;}
:root[data-theme="dark"] .is-post #toc-list a.active::before{background:var(--toc-blue);}
/* "Enjoying this article?" — robot to bên trái, chữ bên phải, nút dài phía dưới (refer/enjoy.png) */
.pt-promo{position:relative;display:grid;grid-template-columns:40% 1fr;grid-template-rows:auto auto;gap:12px 6px;
  align-items:center;overflow:hidden;padding:22px 16px 18px;
  border:7px solid color-mix(in srgb,var(--surface) 85%,transparent);border-radius:20px;
  background:linear-gradient(135deg,color-mix(in srgb,var(--hm-primary) 9%,var(--surface)) 0%,
    color-mix(in srgb,var(--hm-primary) 3%,var(--surface)) 60%,var(--surface) 100%) !important;
  box-shadow:0 8px 30px -12px rgba(37,99,235,.18);}
.pt-promo-art{grid-column:1;grid-row:1 / 3;align-self:start;width:calc(100% + 18px);aspect-ratio:1;margin:-10px 0 0 -16px;
  background:url('../images/chatbot/stock.png') no-repeat 4.8% 83.8% / 487.62% 731.43%;
  -webkit-mask-image:radial-gradient(circle at 50% 48%,#000 55%,transparent 72%);
  mask-image:radial-gradient(circle at 50% 48%,#000 55%,transparent 72%);}
.pt-promo > div:not(.pt-promo-art){grid-column:2;grid-row:1;}
.pt-promo-title{margin:0 0 8px;font-size:15px;font-weight:800;line-height:1.3;color:var(--ink);}
.pt-promo-text{margin:0;font-size:12.5px;line-height:1.6;color:var(--ink-2);}
.pt-promo-btn{grid-column:1 / -1;grid-row:2;justify-self:stretch;margin-left:22%;z-index:1;
  height:44px;padding:0 16px;border-radius:10px;font-size:13.5px;justify-content:center;gap:14px;
  box-shadow:0 8px 18px -8px color-mix(in srgb,var(--hm-primary) 70%,transparent);}
.pt-promo-btn .pt-icon{width:16px;height:16px;flex:0 0 auto;}
/* ---------- BÀI LIÊN QUAN ---------- */
.is-post .pt-after{width:calc(100% - 136px);max-width:1180px;padding:0 0 22px;}
.pt-related{padding-top:32px;}
.pt-related .hm-head{align-items:center;margin-bottom:17px;}
.pt-related .hm-title{gap:12px;}
.pt-related .hm-icon{width:36px;height:40px;padding:0;border-radius:0;background:none;color:#0878ff;}
.pt-related .hm-icon .pt-icon{width:35px;height:35px;stroke-width:1.8;filter:drop-shadow(2px 2px 0 #c7e5ff);}
.pt-related .hm-head h2{font-size:21px;}
.pt-related .hm-head p{font-size:12px;}
.pt-related .hm-head>.hm-btn{height:37px;padding:0 15px;border-radius:8px;font-size:11px;}
.pt-related .hm-head>.hm-btn .pt-icon{width:14px;height:14px;}
.pt-related-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;}
.pt-rel{
  display:grid;grid-template-columns:43% 1fr;overflow:hidden;min-height:144px;padding:5px;
  background:var(--surface);border:1px solid var(--line-soft);border-radius:12px;
  text-decoration:none;color:inherit;transition:transform .25s,border-color .25s;
}
:root:not([data-theme="dark"]) .pt-rel{background:#fff;}
.pt-rel:hover{transform:translateY(-3px);border-color:color-mix(in srgb,var(--c) 35%,var(--line));}
.pt-rel .hm-thumb{height:100%;min-height:132px;border-radius:8px;overflow:hidden;}
.pt-rel-art{position:absolute;inset:0;background:url('../images/articles/topic-sprite.png') 8.3% 83.29% / 702.24% 1672% no-repeat;}
.pt-rel .hm-thumb-mark{font-size:30px;}
.pt-rel-body{display:flex;flex-direction:column;padding:4px 7px 4px 10px;min-width:0;}
.pt-rel-tag{align-self:flex-start;padding:3px 5px;border-radius:5px;font-family:var(--sans);font-size:8px;font-weight:700;letter-spacing:0;text-transform:uppercase;
  color:var(--c);background:color-mix(in srgb,var(--c) 12%,var(--surface));
  max-width:100%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.pt-rel h3{margin:7px 0 5px;font-size:12px;line-height:1.5;font-weight:700;color:var(--ink);
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden;}
.pt-rel p{margin:0;font-size:10px;line-height:1.5;color:var(--ink-3);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;}
.pt-rel .hm-meta{margin-top:auto;padding-top:8px;font-size:9px;gap:5px;flex-wrap:wrap;}
/* Compact newsletter and footer align with the article, as in refer/topic.png. */
/* ---------- RESPONSIVE ---------- */
@media (max-width:1100px){
  .pt-hero{min-height:270px;padding:25px 28px;}
  .pt-hero h1{font-size:30px;}
  .pt-hero-copy{width:66%;}
  .pt-meta{gap:6px 8px;}
  .pt-meta li,.pt-meta a{font-size:9px;padding:4px 7px;gap:5px;}
  .pt-meta .pt-icon{width:13px;height:13px;}
  .is-post .article-shell{gap:16px;}
  .is-post .article-sheet{padding:25px;}
  .is-post .article-body{font-size:14px;}
  .is-post #toc-list a{font-size:11px;padding-left:28px;}
  .is-post #toc-list a.sub{padding-left:33px;}
  .is-post #toc-block .pt-card-title{font-size:14px;}
  .pt-promo{grid-template-columns:38% 1fr;padding:18px 12px 14px;}
  .pt-promo-art{margin-left:-12px;}
  .pt-promo-title{font-size:13px;}
  .pt-promo-text{font-size:11px;}
  .pt-promo-btn{font-size:12px;margin-left:14%;}
  .pt-rel{grid-template-columns:42% 1fr;}
  .pt-rel h3{font-size:11px;}
  .pt-rel-tag{font-size:7px;}
  .pt-rel p{font-size:9px;}
  .pt-rel .hm-meta{font-size:8px;}
}
@media (max-width:900px){
  .pt-wrap,.is-post .pt-after{width:calc(100% - 40px);}
  .is-post .article-shell{grid-template-columns:minmax(0,1fr);gap:14px;padding-top:14px;}
  .is-post .article-toc{display:none;}
  .pt-rail-wrap{position:static;width:auto;}
  .pt-rail{position:static;flex-direction:row;justify-content:space-around;padding:4px;}
  .pt-act{flex:1;max-width:110px;gap:5px;}
  .pt-related-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .pt-rel{min-height:145px;}
  .pt-rel h3{font-size:13px;}
  .pt-rel-tag{font-size:8px;}
  .pt-rel p{font-size:11px;}
}
@media (max-width:600px){
  .pt-wrap{width:calc(100% - 24px);padding-top:14px;}
  .pt-hero{flex-direction:column;align-items:stretch;min-height:0;padding:22px;}
  .pt-hero-copy{width:auto;}
  .pt-hero h1{font-size:28px;}
  .pt-hero-art{position:relative;inset:auto;width:auto;order:-1;aspect-ratio:1.9;margin:-22px -22px 20px;
    -webkit-mask-image:none;mask-image:none;}
  .pt-meta li,.pt-meta a{font-size:10px;}
  .pt-kicker{font-size:9px;max-width:100%;}
  .is-post .article-sheet{padding:22px 18px 26px;border-radius:14px;}
  .is-post .article-body{font-size:14px;}
  .is-post :where(.article-body) h2{font-size:24px;}
  .is-post :where(.article-body) blockquote{padding:14px 12px 14px 42px;font-size:13px;}
  .is-post :where(.article-body) blockquote::before{left:9px;width:23px;}
  .is-post .comments{border-radius:14px;}
  .is-post .viz{padding:20px 10px 14px;overflow-x:auto;}
  .is-post .pt-after{width:calc(100% - 24px);}
  .pt-related{padding-top:26px;}
  .pt-related .hm-head{align-items:flex-start;gap:12px;}
  .pt-related .hm-head h2{font-size:19px;}
  .pt-related .hm-head p{font-size:11px;}
  .pt-related-grid{grid-template-columns:1fr;gap:12px;}
  .pt-rel{grid-template-columns:39% 1fr;}
  .pt-rel .hm-meta{font-size:10px;}
}
.is-post .article-toc .pt-promo-btn{color:#fff;height:auto;min-height:44px;padding:8px 16px;white-space:normal;line-height:1.35;text-align:center;}

/* ---------- BÌNH LUẬN (refer/comment.png) ---------- */
.is-post .comments{padding:28px 28px 30px;}
.is-post .cm-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:20px;}
.is-post .cm-title{margin:0;font-size:28px;font-weight:800;letter-spacing:-.025em;gap:12px;}
.is-post .cm-count{min-width:36px;height:36px;padding:0 10px;display:inline-grid;place-items:center;border-radius:999px;font-family:var(--sans);
  font-size:15px;font-weight:700;color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 12%,var(--surface));border:0;}
.is-post .cm-sort{display:flex;gap:10px;margin-left:auto;}
.is-post .cm-sort a{display:inline-flex;align-items:center;gap:9px;height:44px;padding:0 18px;border-radius:12px;font-size:15px;font-weight:500;
  text-decoration:none;color:var(--ink-2);background:var(--surface);border:1px solid var(--line);transition:.15s;}
.is-post .cm-sort a:hover{border-color:var(--hm-primary);color:var(--hm-primary);}
.is-post .cm-sort a.on{color:var(--hm-primary);font-weight:600;background:color-mix(in srgb,var(--hm-primary) 9%,var(--surface));
  border-color:color-mix(in srgb,var(--hm-primary) 30%,var(--line));}
.is-post .cm-flash{display:flex;align-items:center;gap:9px;border-radius:12px;}

/* Avatar tròn màu theo người dùng */
.is-post .cm-avatar{width:52px;height:52px;font-size:20px;background:var(--av,var(--hm-primary));}

/* Ô viết bình luận */
.is-post .cm-form{gap:18px;padding:18px 20px;margin-bottom:18px;border-radius:18px;background:var(--surface);border:1px solid var(--line-soft);
  box-shadow:0 10px 30px -24px rgba(15,40,100,.4);}
.is-post .cm-replying{display:flex;align-items:center;gap:8px;margin-bottom:8px;padding:7px 12px;border-radius:10px;font-size:13.5px;
  color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 8%,var(--surface));}
.is-post .cm-replying[hidden]{display:none;}
.is-post .cm-replying button{margin-left:auto;width:26px;height:26px;border:0;border-radius:7px;background:none;color:inherit;cursor:pointer;}
.is-post .cm-replying button:hover{background:color-mix(in srgb,var(--hm-primary) 14%,transparent);}
.is-post .cm-editor{border:1px solid var(--line);border-radius:14px;background:var(--surface);transition:border-color .15s,box-shadow .15s;}
.is-post .cm-editor:focus-within{border-color:var(--hm-primary);box-shadow:0 0 0 3px color-mix(in srgb,var(--hm-primary) 13%,transparent);}
.is-post .cm-form textarea{display:block;min-height:96px;padding:16px 18px;font-size:16px;border:0;border-radius:14px 14px 0 0;background:transparent;resize:none;}
.is-post .cm-form textarea::placeholder{color:var(--ink-3);}
.is-post .cm-toolbar{display:flex;align-items:center;gap:4px;padding:8px 10px;border-top:1px solid var(--line-soft);border-radius:0 0 14px 14px;
  background:color-mix(in srgb,var(--surface-2) 70%,var(--surface));}
.is-post .cm-tb{width:38px;height:36px;border:0;border-radius:9px;background:none;cursor:pointer;display:grid;place-items:center;font-size:16px;color:var(--ink-2);transition:.12s;}
.is-post .cm-tb:hover,.is-post .cm-tb[aria-expanded="true"]{color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 10%,var(--surface));}
.is-post .cm-tb-sep{width:1px;height:22px;margin:0 6px;background:var(--line);}
.is-post .cm-chars{margin-left:auto;font-size:12px;color:var(--ink-3);}
.is-post .cm-emoji-wrap{position:relative;}
.is-post .cm-emoji{position:absolute;left:0;bottom:calc(100% + 8px);z-index:20;display:grid;grid-template-columns:repeat(8,34px);gap:2px;padding:8px;
  border-radius:14px;background:var(--surface);border:1px solid var(--line);box-shadow:0 16px 36px -16px rgba(15,40,100,.4);}
.is-post .cm-emoji[hidden]{display:none;}
.is-post .cm-emoji button{width:34px;height:34px;border:0;border-radius:8px;background:none;cursor:pointer;font-size:19px;}
.is-post .cm-emoji button:hover{background:var(--surface-2);}
.is-post .cm-form-actions{margin-top:12px;}
.is-post .cm-as{font-size:14px;}
.is-post .cm-as b{color:var(--ink);}
.is-post .cm-submit{display:inline-flex;align-items:center;gap:10px;height:48px;padding:0 24px;border-radius:12px;font-size:16px;font-weight:700;
  background:var(--hm-primary);box-shadow:0 10px 22px -12px color-mix(in srgb,var(--hm-primary) 90%,transparent);}
.is-post .cm-login{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;border-radius:16px;}
.is-post .cm-login i{font-size:18px;color:var(--hm-primary);}

/* Danh sách: mỗi bình luận gốc là 1 thẻ */
.is-post .cm-list{gap:14px;}
.is-post .cm-list > .cm-item{padding:20px 22px;border-radius:18px;background:var(--surface);border:1px solid var(--line-soft);
  box-shadow:0 10px 30px -26px rgba(15,40,100,.45);scroll-margin-top:100px;}
:root:not([data-theme="dark"]) .is-post .cm-list > .cm-item,:root:not([data-theme="dark"]) .is-post .cm-form{background:#fff;}
.is-post .cm-item{gap:18px;}
.is-post .cm-item:target{border-color:color-mix(in srgb,var(--hm-primary) 50%,var(--line));box-shadow:0 0 0 3px color-mix(in srgb,var(--hm-primary) 14%,transparent);}
.is-post .cm-meta{flex-wrap:wrap;gap:8px;margin-bottom:6px;font-size:15px;}
.is-post .cm-meta b{font-size:17px;font-weight:700;}
.is-post .cm-author{padding:2px 9px;border-radius:999px;font-size:12px;font-weight:700;color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 11%,var(--surface));}
.is-post .cm-time{color:var(--ink-3);}
.is-post .cm-tools{display:flex;align-items:center;gap:6px;margin-left:auto;}
.is-post .cm-del{margin:0;}
.is-post .cm-del button{font-size:14.5px;padding:4px 8px;border-radius:8px;}
.is-post .cm-del button:hover{background:color-mix(in srgb,#ef4444 9%,transparent);}
.is-post .cm-more{position:relative;}
.is-post .cm-more > summary{list-style:none;width:34px;height:30px;display:grid;place-items:center;border-radius:8px;cursor:pointer;color:var(--ink-2);font-size:16px;}
.is-post .cm-more > summary::-webkit-details-marker{display:none;}
.is-post .cm-more > summary:hover,.is-post .cm-more[open] > summary{background:var(--surface-2);color:var(--ink);}
.is-post .cm-menu{position:absolute;right:0;top:calc(100% + 6px);z-index:20;min-width:190px;padding:6px;border-radius:12px;background:var(--surface);
  border:1px solid var(--line);box-shadow:0 16px 36px -16px rgba(15,40,100,.4);}
.is-post .cm-menu button{display:flex;align-items:center;gap:10px;width:100%;padding:9px 10px;border:0;border-radius:8px;background:none;cursor:pointer;
  font-family:var(--sans);font-size:14px;color:var(--ink);text-align:left;}
.is-post .cm-menu button:hover{background:var(--surface-2);}
.is-post .cm-menu i{width:16px;text-align:center;color:var(--ink-2);}

/* Nội dung bình luận (Markdown an toàn) */
.is-post .cm-text{font-size:16px;line-height:1.65;color:var(--ink-2);overflow-wrap:anywhere;}
.is-post .cm-text > *{margin:0 0 8px;}
.is-post .cm-text > :last-child{margin-bottom:0;}
.is-post .cm-text p{font-size:16px;color:var(--ink-2);}
.is-post .cm-text strong{color:var(--ink);}
.is-post .cm-text a[href]{color:var(--hm-primary);}
.is-post .cm-text a:not([href]){color:inherit;text-decoration:line-through;}
.is-post .cm-text code{font-family:var(--mono);font-size:.88em;padding:2px 6px;border-radius:6px;background:var(--surface-2);color:var(--ink);}
.is-post .cm-text pre{padding:12px 14px;border-radius:10px;background:#0f172a;overflow-x:auto;}
.is-post .cm-text pre code{padding:0;background:none;color:#e2e8f0;}
.is-post .cm-text blockquote{margin:0 0 8px;padding:6px 12px;border-left:3px solid var(--hm-primary);border-radius:0 8px 8px 0;color:var(--ink-3);
  background:color-mix(in srgb,var(--hm-primary) 5%,var(--surface));}
.is-post .cm-text ul,.is-post .cm-text ol{padding-left:20px;}

/* Hàng hành động: Thích · Trả lời | n trả lời */
.is-post .cm-actions{display:flex;align-items:center;flex-wrap:wrap;gap:6px;margin-top:10px;margin-left:-8px;}
.is-post .cm-like-form{margin:0;}
.is-post .cm-act{display:inline-flex;align-items:center;gap:8px;height:36px;padding:0 10px;border:0;border-radius:9px;background:none;cursor:pointer;
  font-family:var(--sans);font-size:15px;color:var(--ink-2);text-decoration:none;transition:.12s;}
.is-post .cm-act i{font-size:18px;}
.is-post .cm-act:hover{color:var(--hm-primary);background:color-mix(in srgb,var(--hm-primary) 8%,transparent);}
.is-post .cm-like.on{color:var(--hm-primary);font-weight:600;}
.is-post .cm-like:disabled{opacity:.6;}
.is-post .cm-like-n{font-weight:700;}
.is-post .cm-like-n[hidden]{display:none;}
.is-post .cm-sep{width:1px;height:24px;margin:0 6px;background:var(--line);}
.is-post .cm-toggle i{font-size:12px;}

/* Trả lời: thụt vào, có vạch nối */
.is-post .cm-replies{display:flex;flex-direction:column;gap:14px;margin-top:6px;}
.is-post .cm-replies[hidden],.is-post .cm-replies:empty{display:none;}
.is-post .cm-replies:not(:empty){padding:14px 0 0 18px;margin-left:-8px;border-left:2px solid var(--line-soft);}
.is-post .cm-item.is-reply{gap:12px;scroll-margin-top:100px;}
.is-post .cm-item.is-reply .cm-avatar{width:38px;height:38px;font-size:15px;}
.is-post .cm-item.is-reply .cm-meta b{font-size:15.5px;}
.is-post .cm-item.is-reply .cm-text,.is-post .cm-item.is-reply .cm-text p{font-size:15px;}
.is-post .cm-item.is-reply:target{padding:8px;border-radius:12px;background:color-mix(in srgb,var(--hm-primary) 6%,transparent);}
.is-post .cm-empty{display:flex;align-items:center;justify-content:center;gap:10px;padding:26px;border-radius:16px;border:1px dashed var(--line);}

@media (max-width:640px){
  .is-post .comments{padding:20px 14px 22px;}
  .is-post .cm-title{font-size:23px;}
  .is-post .cm-sort{margin-left:0;width:100%;}
  .is-post .cm-sort a{flex:1;justify-content:center;height:40px;padding:0 10px;font-size:14px;}
  .is-post .cm-form{padding:14px;gap:0;}
  .is-post .cm-form > .cm-avatar{display:none;}
  .is-post .cm-tb{width:34px;}
  .is-post .cm-emoji{grid-template-columns:repeat(6,34px);}
  .is-post .cm-form-actions{flex-direction:column-reverse;align-items:stretch;}
  .is-post .cm-submit{width:100%;justify-content:center;margin-left:0;}
  .is-post .cm-as{text-align:center;}
  .is-post .cm-list > .cm-item{padding:16px 14px;}
  .is-post .cm-item{gap:12px;}
  .is-post .cm-avatar{width:40px;height:40px;font-size:16px;}
  .is-post .cm-meta b{font-size:15.5px;}
  .is-post .cm-text,.is-post .cm-text p{font-size:15px;}
  .is-post .cm-act span{display:none;}
  .is-post .cm-act.cm-toggle span{display:inline;}
  .is-post .cm-replies:not(:empty){padding-left:12px;margin-left:-52px;}
}