/* ================================================================
   MICROADS BLOG — shared stylesheet
   Palette đồng bộ với index.html (dark, cyan/purple)
   ================================================================ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px}
body{font-family:'Inter',-apple-system,BlinkMacSystemFont,sans-serif;background:#050b18;color:#fff;overflow-x:hidden;line-height:1.7;-webkit-font-smoothing:antialiased}
a{text-decoration:none;color:inherit}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
button{font-family:inherit;cursor:pointer}

:root{
  --cyan:#00d4ff;--purple:#7c3aed;--green:#10b981;--red:#ef4444;--amber:#f59e0b;
  --bg:#050b18;--bg2:#0d1626;--bg3:#070e1e;
  --card:rgba(255,255,255,.035);--border:rgba(255,255,255,.08);
  --text:#fff;--text2:#94a3b8;--text3:#475569;
  --r:16px;--rlg:24px;--rsm:8px;--tr:all .3s ease;
}

.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
.container-narrow{max-width:800px;margin:0 auto;padding:0 1.5rem}
.tg{background:linear-gradient(135deg,var(--cyan),var(--purple));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.tgg{background:linear-gradient(135deg,var(--cyan),var(--green));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}

/* ---- Buttons ---- */
.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.875rem 2rem;border-radius:50px;font-weight:600;font-size:1rem;transition:var(--tr);border:none;font-family:inherit;white-space:nowrap}
.btn-p{background:linear-gradient(135deg,var(--cyan),var(--purple));color:#fff}
.btn-p:hover{opacity:.9;transform:translateY(-2px);box-shadow:0 12px 32px rgba(0,212,255,.3)}
.btn-o{background:transparent;border:1px solid rgba(255,255,255,.2);color:#fff}
.btn-o:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(0,212,255,.06);transform:translateY(-2px)}
.btn-sm{padding:.6rem 1.4rem;font-size:.875rem}

/* ================================================================
   NAV (đồng bộ với trang chủ)
   ================================================================ */
.nav{position:fixed;top:0;left:0;right:0;z-index:1000;padding:1rem 0;transition:var(--tr);background:rgba(5,11,24,.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid transparent}
.nav.scrolled{background:rgba(5,11,24,.96);border-bottom:1px solid var(--border);padding:.7rem 0}
.nav .container{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.logo{display:flex;align-items:center;gap:.75rem;font-weight:900;font-size:1.35rem;letter-spacing:-.02em}
.logo-icon{width:42px;height:42px;background:linear-gradient(135deg,var(--cyan),var(--purple));border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;font-weight:900;color:#fff;flex-shrink:0;box-shadow:0 4px 16px rgba(0,212,255,.3)}
.logo-text{color:#fff}
.logo-text em{color:var(--cyan);font-style:normal}
.nav-links{display:flex;align-items:center;gap:.1rem}
.nav-links a{color:var(--text2);font-size:.875rem;font-weight:500;padding:.5rem .9rem;border-radius:8px;transition:var(--tr)}
.nav-links a:hover,.nav-links a.active{color:#fff;background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--cyan)}
.nav-cta{display:flex;align-items:center;gap:.75rem}
.hamburger{display:none;background:none;border:1px solid var(--border);color:#fff;padding:.5rem .7rem;border-radius:8px;font-size:1.1rem;transition:var(--tr)}
.hamburger:hover{border-color:var(--cyan);color:var(--cyan)}
.mob{display:none;position:fixed;inset:0;background:rgba(5,11,24,.99);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);z-index:999;flex-direction:column;align-items:center;justify-content:center;gap:1.75rem}
.mob.open{display:flex}
.mob-close{position:absolute;top:1.5rem;right:1.5rem;background:none;border:1px solid var(--border);color:#fff;padding:.5rem .7rem;border-radius:8px;font-size:1.25rem}
.mob a{color:#fff;font-size:1.5rem;font-weight:800}
.mob a:hover{color:var(--cyan)}

/* ================================================================
   PAGE HEADER / HERO của blog
   ================================================================ */
.blog-hero{position:relative;padding:9rem 0 3rem;overflow:hidden}
.blog-hero .orb{position:absolute;border-radius:50%;filter:blur(90px);pointer-events:none}
.orb-a{width:520px;height:520px;background:var(--cyan);top:-260px;left:-160px;opacity:.14}
.orb-b{width:420px;height:420px;background:var(--purple);top:-160px;right:-120px;opacity:.16}
.bg-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(0,212,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 1px);background-size:50px 50px;mask-image:radial-gradient(ellipse at top,black 20%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse at top,black 20%,transparent 70%);pointer-events:none}
.sec-badge{display:inline-flex;align-items:center;gap:.5rem;background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.2);color:var(--cyan);padding:.4rem 1.2rem;border-radius:50px;font-size:.78rem;font-weight:600;letter-spacing:.06em;text-transform:uppercase;margin-bottom:1.5rem}
.blog-hero h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:900;line-height:1.12;letter-spacing:-.03em;max-width:900px;margin-bottom:1.2rem}
.blog-hero p.lead{color:var(--text2);font-size:1.1rem;max-width:640px;line-height:1.8}

/* ---- Breadcrumb ---- */
.breadcrumb{position:relative;z-index:1;display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;font-size:.82rem;color:var(--text2);margin-bottom:1.5rem}
.breadcrumb a{color:var(--text2);transition:var(--tr)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb .sep{color:var(--text3)}
.breadcrumb span[aria-current]{color:var(--text)}

/* ================================================================
   CATEGORY FILTER
   ================================================================ */
.cat-filter{display:flex;flex-wrap:wrap;gap:.6rem;margin:2.5rem 0 1rem}
.cat-chip{display:inline-flex;align-items:center;gap:.45rem;padding:.55rem 1.1rem;border-radius:50px;font-size:.85rem;font-weight:600;color:var(--text2);background:var(--card);border:1px solid var(--border);transition:var(--tr)}
.cat-chip:hover{color:#fff;border-color:rgba(0,212,255,.4)}
.cat-chip.active{color:#0a0f1e;background:linear-gradient(135deg,var(--cyan),var(--purple));border-color:transparent}
.blog-tools{display:flex;flex-wrap:wrap;gap:1rem;align-items:center;justify-content:space-between;margin-bottom:.5rem}
.search-box{position:relative;flex:1;min-width:240px;max-width:360px}
.search-box i{position:absolute;left:1rem;top:50%;transform:translateY(-50%);color:var(--text3);font-size:.9rem}
.search-box input{width:100%;background:var(--card);border:1px solid var(--border);border-radius:50px;padding:.7rem 1rem .7rem 2.6rem;color:#fff;font-size:.9rem;font-family:inherit;transition:var(--tr)}
.search-box input:focus{outline:none;border-color:rgba(0,212,255,.5);background:rgba(0,212,255,.04)}
.result-count{color:var(--text3);font-size:.82rem}

/* ================================================================
   CARD GRID
   ================================================================ */
.post-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.75rem;margin:2rem 0 1rem}
.post-card{display:flex;flex-direction:column;background:var(--card);border:1px solid var(--border);border-radius:var(--r);overflow:hidden;transition:var(--tr);height:100%}
.post-card:hover{transform:translateY(-4px);border-color:rgba(0,212,255,.35);box-shadow:0 18px 40px rgba(0,0,0,.35)}
.post-thumb{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--bg2)}
.post-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.post-card:hover .post-thumb img{transform:scale(1.05)}
.post-thumb .cat-tag{position:absolute;top:.8rem;left:.8rem;z-index:2;display:inline-flex;align-items:center;gap:.35rem;padding:.32rem .8rem;border-radius:50px;font-size:.72rem;font-weight:700;letter-spacing:.02em;color:#fff;background:rgba(5,11,24,.72);backdrop-filter:blur(6px);border:1px solid rgba(255,255,255,.12)}
.post-thumb .cat-tag i{color:var(--cyan)}
.post-body{display:flex;flex-direction:column;flex:1;padding:1.35rem}
.post-meta{display:flex;align-items:center;gap:.9rem;font-size:.75rem;color:var(--text3);margin-bottom:.7rem}
.post-meta i{margin-right:.3rem;color:var(--text3)}
.post-card h2,.post-card h3{font-size:1.08rem;font-weight:700;line-height:1.4;margin-bottom:.6rem}
.post-card h2 a,.post-card h3 a{transition:var(--tr)}
.post-card:hover h2 a,.post-card:hover h3 a{color:var(--cyan)}
.post-excerpt{color:var(--text2);font-size:.9rem;line-height:1.65;flex:1;margin-bottom:1rem}
.post-more{display:inline-flex;align-items:center;gap:.4rem;color:var(--cyan);font-size:.85rem;font-weight:600;align-self:flex-start}
.post-more i{transition:transform .3s ease}
.post-card:hover .post-more i{transform:translateX(4px)}
.no-result{text-align:center;color:var(--text2);padding:3rem 0;display:none}
.load-more-wrap{text-align:center;margin:2.5rem 0}

/* ---- Featured card (bài mới nhất nổi bật) ---- */
.featured{display:grid;grid-template-columns:1.15fr 1fr;gap:0;background:var(--card);border:1px solid var(--border);border-radius:var(--rlg);overflow:hidden;margin:2.5rem 0;transition:var(--tr)}
.featured:hover{border-color:rgba(0,212,255,.35);box-shadow:0 20px 50px rgba(0,0,0,.4)}
.featured .f-thumb{position:relative;aspect-ratio:16/10;overflow:hidden;background:var(--bg2)}
.featured .f-thumb img{width:100%;height:100%;object-fit:cover}
.featured .f-body{padding:2.5rem;display:flex;flex-direction:column;justify-content:center}
.featured .f-tag{display:inline-flex;align-items:center;gap:.4rem;color:var(--cyan);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-bottom:1rem}
.featured h2{font-size:clamp(1.4rem,2.6vw,2rem);font-weight:800;line-height:1.25;margin-bottom:1rem}
.featured p{color:var(--text2);font-size:1rem;line-height:1.7;margin-bottom:1.5rem}
.featured .post-meta{margin-bottom:1.25rem}

/* ================================================================
   ARTICLE PAGE
   ================================================================ */
.article-wrap{padding:8.5rem 0 4rem;position:relative}
.article-head{max-width:800px;margin:0 auto 2rem}
.article-cat{display:inline-flex;align-items:center;gap:.45rem;color:var(--cyan);font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;margin-bottom:1rem}
.article-head h1{font-size:clamp(1.8rem,4.2vw,2.9rem);font-weight:900;line-height:1.18;letter-spacing:-.02em;margin-bottom:1.25rem}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:1.25rem;color:var(--text2);font-size:.85rem;padding-bottom:.5rem}
.article-meta .am{display:inline-flex;align-items:center;gap:.45rem}
.article-meta i{color:var(--cyan)}
.article-avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--cyan),var(--purple));display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:.85rem;color:#fff}
.article-hero{max-width:960px;margin:0 auto 2.5rem;border-radius:var(--rlg);overflow:hidden;aspect-ratio:16/8;background:var(--bg2);border:1px solid var(--border)}
.article-hero img{width:100%;height:100%;object-fit:cover}

.article-layout{max-width:800px;margin:0 auto}
.toc{background:var(--card);border:1px solid var(--border);border-left:3px solid var(--cyan);border-radius:var(--rsm);padding:1.3rem 1.5rem;margin-bottom:2.5rem}
.toc-title{display:flex;align-items:center;gap:.5rem;font-size:.8rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--text2);margin-bottom:.9rem}
.toc-title i{color:var(--cyan)}
.toc ol{list-style:none;counter-reset:toc;display:flex;flex-direction:column;gap:.55rem}
.toc ol li{counter-increment:toc;position:relative;padding-left:1.9rem}
.toc ol li::before{content:counter(toc,decimal-leading-zero);position:absolute;left:0;top:0;color:var(--cyan);font-size:.78rem;font-weight:700;font-variant-numeric:tabular-nums}
.toc ol li a{color:var(--text2);font-size:.92rem;transition:var(--tr)}
.toc ol li a:hover{color:var(--cyan)}

.article-body{font-size:1.08rem;line-height:1.85;color:#d7dee9}
.article-body h2{font-size:clamp(1.35rem,2.6vw,1.75rem);font-weight:800;line-height:1.3;color:#fff;margin:2.6rem 0 1rem;padding-top:.5rem;scroll-margin-top:100px}
.article-body h3{font-size:clamp(1.12rem,2vw,1.3rem);font-weight:700;line-height:1.35;color:#eaf0f7;margin:1.9rem 0 .8rem;scroll-margin-top:100px}
.article-body h2 + p,.article-body h3 + p{margin-top:0}
.article-body p{margin-bottom:1.3rem}
.article-body strong{color:#fff;font-weight:700}
.article-body a{color:var(--cyan);border-bottom:1px solid rgba(0,212,255,.35)}
.article-body a:hover{border-color:var(--cyan)}

/* Tag chips */
.article-tags{display:flex;flex-wrap:wrap;gap:.55rem;margin:2.5rem 0}
.tag-chip{display:inline-flex;align-items:center;gap:.35rem;padding:.4rem .9rem;border-radius:50px;font-size:.78rem;color:var(--text2);background:var(--card);border:1px solid var(--border)}
.tag-chip i{color:var(--text3);font-size:.7rem}

/* CTA box */
.cta-box{position:relative;overflow:hidden;background:linear-gradient(135deg,rgba(0,212,255,.1),rgba(124,58,237,.1));border:1px solid rgba(0,212,255,.2);border-radius:var(--rlg);padding:2.5rem;margin:3rem 0;text-align:center}
.cta-box h3{font-size:1.4rem;font-weight:800;margin-bottom:.7rem}
.cta-box p{color:var(--text2);max-width:520px;margin:0 auto 1.5rem;line-height:1.7}
.cta-actions{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap}

/* Author box */
.author-box{display:flex;gap:1.25rem;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:1.6rem;margin:2.5rem 0}
.author-box .a-ava{width:56px;height:56px;border-radius:14px;flex-shrink:0;background:linear-gradient(135deg,var(--cyan),var(--purple));display:flex;align-items:center;justify-content:center;font-weight:900;color:#fff;font-size:1.3rem;box-shadow:0 4px 16px rgba(0,212,255,.3)}
.author-box .a-name{font-weight:700;margin-bottom:.25rem}
.author-box .a-name em{color:var(--cyan);font-style:normal}
.author-box .a-desc{color:var(--text2);font-size:.9rem;line-height:1.65}

/* Prev / Next */
.prevnext{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin:2.5rem 0}
.pn-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:1.25rem 1.4rem;transition:var(--tr)}
.pn-card:hover{border-color:rgba(0,212,255,.35);background:rgba(0,212,255,.04)}
.pn-card .pn-label{font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text3);margin-bottom:.4rem;display:flex;align-items:center;gap:.4rem}
.pn-card .pn-title{font-size:.95rem;font-weight:600;line-height:1.4;color:#e6edf5}
.pn-card.next{text-align:right}
.pn-card.next .pn-label{justify-content:flex-end}

/* Related */
.related{margin-top:3.5rem}
.related h2.rel-title{font-size:1.5rem;font-weight:800;margin-bottom:1.5rem}

/* ================================================================
   FOOTER (đồng bộ trang chủ)
   ================================================================ */
.footer{background:#020810;border-top:1px solid var(--border);padding:4rem 0 2rem;margin-top:2rem}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:3rem;margin-bottom:3rem}
.f-brand p{color:var(--text2);font-size:.9rem;line-height:1.7;margin:1rem 0 1.25rem;max-width:340px}
.socials{display:flex;gap:.6rem}
.soc{width:38px;height:38px;border-radius:10px;background:var(--card);border:1px solid var(--border);display:flex;align-items:center;justify-content:center;color:var(--text2);transition:var(--tr)}
.soc:hover{color:var(--cyan);border-color:rgba(0,212,255,.4);transform:translateY(-2px)}
.f-col h4{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--text2);margin-bottom:1.25rem}
.f-col ul{display:flex;flex-direction:column;gap:.75rem}
.f-col ul li a{color:var(--text2);font-size:.85rem;transition:var(--tr)}
.f-col ul li a:hover{color:var(--cyan)}
.f-bottom{border-top:1px solid var(--border);padding-top:2rem;display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem;font-size:.78rem;color:var(--text3)}
.f-bottom a{color:var(--text3);transition:var(--tr)}
.f-bottom a:hover{color:var(--cyan)}

/* Back to top */
.to-top{position:fixed;right:1.5rem;bottom:1.5rem;width:46px;height:46px;border-radius:12px;background:linear-gradient(135deg,var(--cyan),var(--purple));color:#fff;display:flex;align-items:center;justify-content:center;font-size:1rem;opacity:0;pointer-events:none;transition:var(--tr);z-index:900;box-shadow:0 8px 24px rgba(0,212,255,.35)}
.to-top.show{opacity:1;pointer-events:auto}
.to-top:hover{transform:translateY(-3px)}

/* ================================================================
   RESPONSIVE
   ================================================================ */
@media(max-width:960px){
  .post-grid{grid-template-columns:repeat(2,1fr)}
  .featured{grid-template-columns:1fr}
  .featured .f-thumb{aspect-ratio:16/9}
  .featured .f-body{padding:1.8rem}
}
@media(max-width:820px){
  .nav-links,.nav-cta .btn-o{display:none}
  .hamburger{display:inline-flex}
}
@media(max-width:640px){
  .post-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:2rem}
  .prevnext{grid-template-columns:1fr}
  .article-wrap{padding-top:7rem}
  .blog-hero{padding-top:7rem}
  .cta-box,.featured .f-body{padding:1.6rem}
  .f-bottom{flex-direction:column;text-align:center}
}
@media(max-width:420px){
  .footer-grid{grid-template-columns:1fr}
}