/* ==========================================================================
   ToolTiny Blog — Shared Stylesheet
   Dùng chung cho mọi bài viết trong /blog/. Import 1 dòng thay vì lặp lại
   14KB CSS trong mỗi file .html — nhẹ trang hơn, sửa 1 chỗ áp dụng toàn bộ.
   ========================================================================== */

:root{
  --bg: #f7f8fb;
  --paper: #ffffff;
  --border: #e5e9f0;
  --ink: #0f1729;
  --ink-dim: #47536b;
  --ink-light: #7c869c;
  --accent: #2563eb;
  --accent-ink: #1d4ed8;
  --accent-soft: rgba(37,99,235,.08);
  --accent2: #ea580c;
  --accent2-soft: rgba(234,88,12,.10);
  --success: #16a34a;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --shadow-card: 0 1px 2px rgba(15,23,41,.04), 0 12px 32px rgba(15,23,41,.06);
  --content-w: 720px;
  --rail-w: 240px;
}

*,*::before,*::after{ box-sizing:border-box; margin:0; padding:0; }

html{ scroll-behavior:smooth; scroll-padding-top:96px; }

body.blog-body{
  font-family:'Inter',-apple-system,sans-serif;
  background:var(--bg);
  color:var(--ink);
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
}

/* ── Reading progress bar ─────────────────────────────────────────────── */
.blog-progress{
  position:fixed; top:0; left:0; height:3px; width:0%;
  background:linear-gradient(90deg, var(--accent), var(--accent2));
  z-index:999; transition:width .1s linear;
}

/* ── Breadcrumb ────────────────────────────────────────────────────────── */
.blog-bc-wrap{ max-width:1100px; margin:24px auto 0; padding:0 20px; }
.blog-bc{
  display:inline-flex; align-items:center; gap:8px;
  font-size:.84rem; font-weight:600; color:var(--ink-light);
}
.blog-bc a{ color:var(--ink-light); text-decoration:none; }
.blog-bc a:hover{ color:var(--accent); }
.blog-bc svg{ width:12px; height:12px; opacity:.5; }

/* ── Article shell: sidebar rail + content column ─────────────────────── */
.blog-shell{
  max-width:1100px; margin:28px auto 90px; padding:0 20px;
  display:grid; grid-template-columns:var(--rail-w) minmax(0,var(--content-w));
  gap:48px; align-items:start;
}
@media (max-width:900px){
  .blog-shell{ grid-template-columns:1fr; }
  .blog-rail{ display:none; }
}

/* ── Sticky TOC rail with scrollspy ───────────────────────────────────── */
.blog-rail{ position:sticky; top:96px; }
.blog-rail-label{
  font-size:.72rem; font-weight:800; letter-spacing:.08em; text-transform:uppercase;
  color:var(--ink-light); margin-bottom:14px;
}
.blog-rail-toc{
  display:flex; flex-direction:column; float:none;
  position:relative; border-left:2px solid var(--border); padding-left:18px;
}
.blog-rail-toc a{
  position:relative; display:block; float:none; width:auto;
  font-size:.87rem; font-weight:600;
  color:var(--ink-dim); text-decoration:none; padding:7px 0; transition:color .15s;
}
.blog-rail-toc a:hover{ color:var(--accent); }
.blog-rail-toc a.active{ color:var(--accent); }
.blog-rail-toc a.active::before{
  content:''; position:absolute; left:-20px; top:0; bottom:0; width:2px; background:var(--accent);
}
.blog-rail-cta{
  margin-top:28px; padding:18px; border-radius:var(--radius-md);
  background:var(--ink); color:#fff;
}
.blog-rail-cta p{ font-size:.82rem; color:#c7cede; margin-bottom:12px; line-height:1.5; }
.blog-rail-cta a{
  display:flex; align-items:center; justify-content:center; gap:6px;
  padding:10px; border-radius:var(--radius-sm); background:var(--accent2);
  color:#fff; text-decoration:none; font-weight:800; font-size:.84rem;
}

/* ── Article header ────────────────────────────────────────────────────── */
.blog-article-head{ display:block; float:none; margin-bottom:32px; }
.blog-eyebrow{
  display:inline-flex; align-items:center; gap:8px; padding:6px 14px;
  border-radius:999px; background:var(--accent-soft); color:var(--accent-ink);
  font-size:.76rem; font-weight:800; text-transform:uppercase; letter-spacing:.04em;
  margin-bottom:18px;
}
.blog-article-head h1{
  font-size:clamp(1.9rem,4vw,2.7rem); line-height:1.15; letter-spacing:-.02em;
  color:var(--ink); margin-bottom:20px;
}
.blog-byline{
  display:flex; align-items:center; gap:12px; padding-top:20px; border-top:1px solid var(--border);
}
.blog-byline-avatar{
  width:38px; height:38px; border-radius:50%; flex-shrink:0;
  background:linear-gradient(135deg,var(--accent),var(--accent2));
  color:#fff; display:grid; place-items:center; font-weight:800; font-size:.82rem;
}
.blog-byline-info{ font-size:.84rem; }
.blog-byline-name{ font-weight:700; color:var(--ink); }
.blog-byline-meta{ color:var(--ink-light); }
.blog-byline-meta span{ margin:0 6px; }

/* ── Body typography ──────────────────────────────────────────────────── */
.blog-article-body{ font-size:1.03rem; color:var(--ink-dim); }
.blog-article-body > p.blog-lede{
  font-size:1.14rem; color:var(--ink); font-weight:500; margin-bottom:20px;
}
.blog-article-body p{ margin-bottom:18px; }
.blog-article-body h2{
  font-size:1.5rem; color:var(--ink); letter-spacing:-.01em;
  margin:44px 0 16px; scroll-margin-top:96px;
}
.blog-article-body h3{ font-size:1.14rem; color:var(--ink); margin:26px 0 10px; }
.blog-article-body ul, .blog-article-body ol{ margin:0 0 20px 22px; }
.blog-article-body li{ margin-bottom:9px; }
.blog-article-body a{ color:var(--accent); font-weight:600; text-decoration-thickness:1.5px; }
.blog-article-body strong{ color:var(--ink); }

/* ── Numbered step cards (for how-to guides) ──────────────────────────── */
.blog-steps{ list-style:none; margin:24px 0; padding:0; counter-reset:step; }
.blog-steps li{
  counter-increment:step; position:relative; padding:4px 0 4px 46px; margin-bottom:18px;
}
.blog-steps li::before{
  content:counter(step); position:absolute; left:0; top:0;
  width:32px; height:32px; border-radius:50%;
  background:var(--accent); color:#fff; font-weight:800; font-size:.9rem;
  display:grid; place-items:center;
}
.blog-steps li strong{ display:block; color:var(--ink); margin-bottom:2px; }

/* ── Callout / note ────────────────────────────────────────────────────── */
.blog-callout{
  display:flex; gap:12px; padding:18px 20px; border-radius:var(--radius-md);
  background:var(--accent-soft); border:1px solid rgba(37,99,235,.15); margin:26px 0;
}
.blog-callout.warn{ background:var(--accent2-soft); border-color:rgba(234,88,12,.18); }
.blog-callout svg{ flex-shrink:0; width:20px; height:20px; margin-top:2px; color:var(--accent); }
.blog-callout.warn svg{ color:var(--accent2); }
.blog-callout p{ margin:0; color:var(--ink-dim); font-size:.95rem; }

/* ── CTA box ───────────────────────────────────────────────────────────── */
.blog-cta-box{
  margin:36px 0; padding:26px; border-radius:var(--radius-lg);
  background:linear-gradient(135deg, var(--ink) 0%, #1e2a4a 100%);
  color:#fff; display:flex; align-items:center; justify-content:space-between;
  gap:20px; flex-wrap:wrap;
}
.blog-cta-box strong{ display:block; font-size:1.12rem; margin-bottom:4px; }
.blog-cta-box p{ margin:0; color:#c7cede; font-size:.9rem; }
.blog-cta-box a{
  display:inline-flex; align-items:center; gap:8px; padding:12px 20px;
  border-radius:var(--radius-sm); background:var(--accent2); color:#fff;
  text-decoration:none; font-weight:800; white-space:nowrap;
}

/* ── Related tools ─────────────────────────────────────────────────────── */
.blog-related-grid{
  display:grid; grid-template-columns:repeat(auto-fit,minmax(200px,1fr)); gap:12px; margin-top:16px;
}
.blog-related-grid a{
  display:flex; align-items:center; gap:12px; padding:16px; border-radius:var(--radius-md);
  background:var(--paper); border:1px solid var(--border); text-decoration:none; color:var(--ink);
  transition:border-color .15s, transform .15s;
}
.blog-related-grid a:hover{ border-color:var(--accent); transform:translateY(-1px); }
.blog-related-icon{
  width:38px; height:38px; border-radius:var(--radius-sm); background:var(--accent-soft);
  color:var(--accent-ink); display:grid; place-items:center; flex-shrink:0;
}
.blog-related-grid strong{ display:block; font-size:.92rem; }
.blog-related-grid span{ display:block; font-size:.78rem; color:var(--ink-light); margin-top:1px; }

/* ── FAQ accordion (native details/summary, no JS needed) ────────────────── */
.blog-faq-list{ margin-top:16px; }
.blog-faq-item{
  border:1px solid var(--border); border-radius:var(--radius-md); margin-bottom:10px;
  background:var(--paper); overflow:hidden;
}
.blog-faq-item summary{
  cursor:pointer; padding:16px 20px; font-weight:700; color:var(--ink); font-size:.96rem;
  list-style:none; display:flex; justify-content:space-between; align-items:center; gap:12px;
}
.blog-faq-item summary::-webkit-details-marker{ display:none; }
.blog-faq-item summary::after{
  content:'+'; font-size:1.3rem; font-weight:400; color:var(--ink-light); flex-shrink:0;
}
.blog-faq-item[open] summary::after{ content:'−'; }
.blog-faq-item[open] summary{ border-bottom:1px solid var(--border); }
.blog-faq-item .blog-faq-a{ padding:14px 20px 18px; color:var(--ink-dim); font-size:.92rem; }

/* ── Prev/Next + back to blog ─────────────────────────────────────────── */
.blog-article-nav{
  margin-top:48px; padding-top:24px; border-top:1px solid var(--border);
  display:flex; justify-content:space-between; align-items:center; gap:16px; flex-wrap:wrap;
}
.blog-article-nav a{
  color:var(--ink-dim); text-decoration:none; font-weight:700; font-size:.88rem;
  display:inline-flex; align-items:center; gap:6px;
}
.blog-article-nav a:hover{ color:var(--accent); }

@media (max-width:768px){
  .blog-article-head, .blog-article-body{ padding:0; }
}

/* ── Blog index / hub page ─────────────────────────────────────────────── */
.blog-index-wrap{ max-width:1100px; margin:36px auto 90px; padding:0 20px; }
.blog-index-head{ margin-bottom:36px; max-width:100%; }
.blog-index-head h1{
  font-size:clamp(2rem,4vw,2.8rem); letter-spacing:-.02em; color:var(--ink); margin-bottom:12px;
}
.blog-index-head p{ color:var(--ink-dim); font-size:1rem; }
.blog-index-grid{
  display:grid; grid-template-columns:repeat(auto-fill,minmax(300px,1fr)); gap:20px;
}
.blog-index-card{
  display:flex; flex-direction:column; padding:24px; border-radius:var(--radius-lg);
  background:var(--paper); border:1px solid var(--border); text-decoration:none;
  color:var(--ink); box-shadow:var(--shadow-card); transition:transform .15s, border-color .15s;
}
.blog-index-card:hover{ transform:translateY(-2px); border-color:var(--accent); }
.blog-index-tag{
  display:inline-flex; align-self:flex-start; padding:5px 12px; border-radius:999px;
  background:var(--accent-soft); color:var(--accent-ink); font-size:.72rem; font-weight:800;
  text-transform:uppercase; letter-spacing:.04em; margin-bottom:14px;
}
.blog-index-tag.news{ background:var(--accent2-soft); color:var(--accent2); }
.blog-index-card h2{
  font-size:1.18rem; color:var(--ink); line-height:1.35; margin-bottom:10px;
}
.blog-index-card p{
  font-size:.9rem; color:var(--ink-dim); line-height:1.6; margin-bottom:16px; flex-grow:1;
}
.blog-index-card-meta{
  font-size:.8rem; color:var(--ink-light); font-weight:600;
  display:flex; align-items:center; gap:8px; padding-top:14px; border-top:1px solid var(--border);
}