/* ============================================================
   Thảo Điền Spa — CSS riêng cho TRANG BÀI VIẾT CHI TIẾT (single-post.php)
   Post hero, Progress bar, Prose, Steps, Tags/Share, Author, Related, TOC
   ============================================================ */
h4{font-family:var(--serif);font-weight:500;line-height:1.15;letter-spacing:.005em}

/* Post hero */
.post-hero{position:relative;background:var(--leaf-dark);overflow:hidden}
.post-hero .bg{position:absolute;inset:0}
.post-hero .bg img{width:100%;height:100%;object-fit:cover;opacity:.32}
.post-hero .bg::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(44,74,31,.6) 0%,rgba(44,74,31,.88) 100%)}
.post-hero .wrap{position:relative;z-index:2;padding-top:64px;padding-bottom:72px;max-width:860px}
.post-hero .breadcrumb{display:flex;align-items:center;gap:8px;font-size:.78rem;letter-spacing:.06em;color:rgba(255,255,255,.5);margin-bottom:24px}
.post-hero .breadcrumb a{transition:color .25s}.post-hero .breadcrumb a:hover{color:var(--gold)}
.post-hero .breadcrumb svg{width:12px;height:12px;opacity:.5}
.post-hero .eyebrow{color:var(--gold)}.post-hero .eyebrow::before{background:var(--gold)}
.post-hero h1{font-size:clamp(2rem,4.4vw,3.4rem);color:#fff;margin:16px 0 20px;text-wrap:balance;line-height:1.12}
.post-hero h1 em{font-style:italic;color:var(--gold)}
.article-meta{display:flex;align-items:center;gap:20px;flex-wrap:wrap}
.article-meta .author{display:flex;align-items:center;gap:10px}
.article-meta .author .av{width:36px;height:36px;border-radius:50%;overflow:hidden;border:2px solid rgba(255,255,255,.3)}
.article-meta .author .av img{width:100%;height:100%;object-fit:cover}
.article-meta .author .an{font-size:.84rem;color:rgba(255,255,255,.9);font-weight:400}
.article-meta .dot{width:3px;height:3px;border-radius:50%;background:rgba(255,255,255,.3)}
.article-meta .mi{font-size:.8rem;color:rgba(255,255,255,.6);display:flex;align-items:center;gap:5px}
.article-meta .mi svg{width:13px;height:13px}
@media(max-width:640px){.post-hero .wrap{padding-top:48px;padding-bottom:52px}}

/* Progress bar */
.progress-bar{position:fixed;top:0;left:0;height:3px;background:linear-gradient(90deg,var(--leaf),var(--gold));z-index:100;transition:width .1s linear;width:0}

/* Article layout */
.article-wrap{padding:64px 0 80px}
.article-wrap > .wrap{display:grid;grid-template-columns:1fr 280px;gap:56px;align-items:start}
@media(max-width:960px){.article-wrap > .wrap{grid-template-columns:1fr}}

/* Article content */
.article-content{max-width:720px}
.article-content .lead-img{border-radius:16px;overflow:hidden;margin-bottom:36px;box-shadow:var(--shadow)}
.article-content .lead-img img{width:100%;aspect-ratio:16/7;object-fit:cover}

.prose{color:var(--ink-soft);font-size:1rem;line-height:1.85}
.prose p{margin-bottom:22px}
.prose h2{font-family:var(--serif);font-size:clamp(1.6rem,2.8vw,2.2rem);color:var(--leaf-dark);margin:40px 0 16px;line-height:1.12}
.prose h3{font-family:var(--serif);font-size:1.4rem;color:var(--leaf-dark);margin:28px 0 12px}
.prose strong{color:var(--ink);font-weight:600}
.prose em{font-style:italic;color:var(--ink)}
.prose ul,.prose ol{padding-left:22px;margin-bottom:22px}
.prose li{margin-bottom:8px}
.prose blockquote{
  border-left:3px solid var(--gold);
  margin:32px 0;padding:18px 24px;
  background:rgba(242,183,5,.07);
  border-radius:0 12px 12px 0;
  font-family:var(--serif);font-size:1.2rem;color:var(--leaf-dark);line-height:1.5;
}
.prose blockquote cite{display:block;font-family:var(--sans);font-size:.78rem;color:var(--ink-soft);margin-top:8px;font-style:normal}
.prose .tip-box{
  background:rgba(124,179,66,.1);border:1px solid rgba(124,179,66,.22);
  border-radius:14px;padding:18px 22px;margin:28px 0;
  display:flex;gap:14px;align-items:flex-start;
}
.prose .tip-box svg{width:20px;height:20px;color:var(--leaf-deep);flex:none;margin-top:2px}
.prose .tip-box p{margin:0;color:var(--ink);font-size:.92rem}

/* Step cards */
.step-list{display:flex;flex-direction:column;gap:16px;margin:28px 0}
.step-card{display:flex;gap:18px;background:var(--paper);border-radius:14px;padding:20px 22px;border:1px solid var(--line)}
.step-num{width:40px;height:40px;border-radius:10px;background:linear-gradient(135deg,var(--leaf-deep),var(--leaf-dark));color:#fff;display:grid;place-items:center;font-family:var(--sans);font-weight:700;font-size:.9rem;flex:none}
.step-card h4{font-size:1.05rem;color:var(--leaf-dark);margin-bottom:6px}
.step-card p{font-size:.88rem;color:var(--ink-soft);margin:0;line-height:1.6}

/* Tags */
.post-tags{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:36px;padding-top:28px;border-top:1px solid var(--line)}
.post-tags .tl{font-size:.76rem;letter-spacing:.1em;color:var(--ink-soft);text-transform:uppercase;font-weight:500}
.post-tags a{padding:5px 14px;border-radius:40px;border:1.5px solid var(--line);font-size:.76rem;color:var(--ink-soft);transition:background .2s,color .2s,border-color .2s}
.post-tags a:hover{background:var(--leaf-deep);color:#fff;border-color:var(--leaf-deep)}

/* Share */
.post-share{display:flex;align-items:center;gap:10px;margin-top:20px}
.post-share .sl{font-size:.76rem;letter-spacing:.1em;color:var(--ink-soft);text-transform:uppercase;font-weight:500}
.share-btn{width:36px;height:36px;border-radius:50%;border:1.5px solid var(--line);display:grid;place-items:center;transition:.25s;cursor:pointer}
.share-btn svg{width:16px;height:16px;color:var(--ink-soft)}
.share-btn:hover{background:var(--leaf-deep);border-color:var(--leaf-deep)}
.share-btn:hover svg{color:#fff}

/* Author bio */
.author-bio{background:var(--paper);border-radius:18px;padding:28px;border:1px solid var(--line);margin-top:40px;display:flex;gap:20px;align-items:flex-start}
.author-bio .av{width:70px;height:70px;border-radius:50%;overflow:hidden;flex:none;border:3px solid var(--line)}
.author-bio .av img{width:100%;height:100%;object-fit:cover}
.author-bio .inf .name{font-family:var(--serif);font-size:1.3rem;color:var(--leaf-dark);font-weight:500}
.author-bio .inf .role{font-size:.74rem;letter-spacing:.12em;text-transform:uppercase;color:var(--gold-deep);font-weight:500;margin-bottom:8px}
.author-bio .inf p{font-size:.86rem;color:var(--ink-soft);margin:0}
@media(max-width:600px){.author-bio{flex-direction:column}}

/* Related posts */
.related{padding:0 0 80px}
.related h2{font-size:clamp(1.8rem,3vw,2.4rem);color:var(--leaf-dark);margin-bottom:28px}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.related-card{background:var(--paper);border-radius:14px;overflow:hidden;border:1px solid var(--line);transition:transform .4s,box-shadow .4s}
.related-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.related-card .rt{overflow:hidden;aspect-ratio:16/9}
.related-card .rt img{width:100%;height:100%;object-fit:cover;transition:transform .7s cubic-bezier(.2,.7,.2,1)}
.related-card:hover .rt img{transform:scale(1.06)}
.related-card .rb{padding:18px}
.related-card .rb h4{font-size:1.05rem;color:var(--leaf-dark);margin:8px 0 6px;line-height:1.3;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.related-card .rb p{font-size:.82rem;color:var(--ink-soft)}
@media(max-width:760px){.related-grid{grid-template-columns:1fr 1fr}}
@media(max-width:500px){.related-grid{grid-template-columns:1fr}}

/* Sidebar — sticky cho trang bài viết */
.sidebar{position:sticky;top:90px}
.toc-list{list-style:none;display:flex;flex-direction:column;gap:0}
.toc-list a{display:block;font-size:.84rem;color:var(--ink-soft);padding:7px 10px;border-radius:8px;border-left:2px solid transparent;transition:background .2s,color .2s,border-color .2s;line-height:1.4}
.toc-list a:hover,.toc-list a.toc-active{background:rgba(124,179,66,.1);color:var(--leaf-deep);border-left-color:var(--leaf-deep)}
.toc-list .toc-sub a{padding-left:22px;font-size:.8rem}