/* VUTRUX blog — shared stylesheet. Brand-matched to vutrux.com, lightweight, fast. */
:root{
  --navy:#0A3161;--navy-2:#0d2a4d;--red:#B31942;--cream:#F6F1E7;--cream-2:#efe7d6;
  --char:#17130F;--char-2:#241d17;--bronze:#B08D57;--bronze-2:#c9a97a;
  --ink:#1d1a17;--muted:#6d655b;--line:#e4dccb;--white:#fff;
  --shadow:0 18px 50px -18px rgba(10,25,40,.35);--radius:16px;--maxw:1200px;--measure:70ch;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,Arial,sans-serif;color:var(--ink);background:var(--cream);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
h1,h2,h3,h4,.serif{font-family:'Playfair Display',Georgia,serif;line-height:1.14;letter-spacing:-.01em;color:var(--navy)}
img{max-width:100%;display:block}
a{color:var(--red);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.btn{display:inline-flex;align-items:center;gap:.5em;border:none;cursor:pointer;font-family:inherit;font-weight:600;font-size:.95rem;padding:.85em 1.5em;border-radius:999px;transition:.2s;white-space:nowrap}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:#93122f;transform:translateY(-2px)}
.btn-navy{background:var(--navy);color:#fff}
.btn-navy:hover{background:#07203f;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:var(--navy);border:1.5px solid var(--navy)}
.btn-ghost:hover{background:var(--navy);color:#fff}
.btn-sm{padding:.6em 1.1em;font-size:.85rem}
.eyebrow{font-size:.78rem;letter-spacing:.22em;text-transform:uppercase;font-weight:600;color:var(--bronze)}

/* ---------- HEADER ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(246,241,231,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:68px;gap:20px}
.logo{font-family:'Playfair Display',serif;font-weight:800;font-size:1.4rem;color:var(--navy);display:flex;align-items:center;gap:.4em;letter-spacing:.02em}
.logo .mark{display:inline-grid;place-items:center;width:32px;height:32px;background:var(--red);color:#fff;border-radius:8px;font-size:1rem}
.menu{display:flex;gap:26px}
.menu a{color:var(--ink);font-weight:500;font-size:.95rem}
.menu a:hover{color:var(--red);text-decoration:none}
.nav-cta{display:flex;align-items:center;gap:12px}
.blog-lang{background:#fff;color:var(--ink);border:1px solid var(--line);border-radius:8px;padding:.4em .5em;font:inherit;font-size:.85rem;cursor:pointer;max-width:150px}
.blog-lang:hover{border-color:var(--red)}
/* An banner + gadget Google Translate (widget van chay, chi an giao dien) */
iframe.skiptranslate,.goog-te-banner-frame,.goog-te-balloon-frame,#goog-gt-tt,.goog-te-spinner-pos,.goog-te-gadget-icon{display:none !important;visibility:hidden !important;}
body{top:0 !important;position:static !important;}
font.goog-text-highlight{background:none !important;box-shadow:none !important;color:inherit !important;}
.burger{display:none;background:none;border:none;font-size:1.5rem;cursor:pointer;color:var(--navy)}

/* ---------- BREADCRUMB ---------- */
.crumb{background:var(--navy);color:#cdd8e6;font-size:.82rem}
.crumb .wrap{padding-top:10px;padding-bottom:10px}
.crumb a{color:#cdd8e6}
.crumb a:hover{color:#fff}
.crumb b{color:#fff}

/* ---------- ARTICLE ---------- */
.article-hero{background:linear-gradient(160deg,var(--navy),var(--char));color:#fff;padding:54px 0 44px}
.article-hero .eyebrow{color:var(--bronze-2)}
.article-hero h1{color:#fff;font-size:clamp(1.9rem,4.4vw,3rem);margin:.35em 0 .3em;max-width:20ch}
.article-hero .meta{color:#c3ccd9;font-size:.88rem;display:flex;gap:16px;flex-wrap:wrap;align-items:center}
.article-hero .meta .dot{opacity:.5}
.hero-figure{margin:0}
.hero-figure img{width:100%;height:auto;border-radius:var(--radius);box-shadow:var(--shadow)}
.hero-svg{width:100%;height:300px;border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.article-wrap{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;padding:46px 0 20px;align-items:start}
.prose{max-width:var(--measure);font-size:1.08rem;min-width:0;overflow-wrap:break-word;word-break:break-word}
.prose>figure{margin:26px 0}
.prose>figure img{border-radius:14px;box-shadow:var(--shadow)}
.prose figcaption{font-size:.82rem;color:var(--muted);margin-top:8px;text-align:center}
.lead{font-size:1.22rem;line-height:1.6;color:var(--char-2);font-weight:500;margin-bottom:1.1em}
.prose h2{font-size:1.6rem;margin:1.5em 0 .5em;padding-top:.2em}
.prose h3{font-size:1.22rem;margin:1.3em 0 .4em;color:var(--char-2)}
.prose p{margin:0 0 1.05em}
.prose ul,.prose ol{margin:0 0 1.15em 1.2em}
.prose li{margin:.35em 0}
.prose strong{color:var(--char-2)}
.prose blockquote{border-left:4px solid var(--bronze);background:#fff;padding:16px 22px;border-radius:0 12px 12px 0;margin:1.2em 0;font-style:italic;color:var(--char-2);box-shadow:var(--shadow)}
.prose table{display:block;width:100%;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border-collapse:collapse;margin:1.2em 0;font-size:.95rem;background:#fff;border-radius:12px;box-shadow:var(--shadow)}
.prose th,.prose td{padding:11px 14px;text-align:left;border-bottom:1px solid var(--line)}
.prose thead th{background:var(--navy);color:#fff;font-family:'Inter',sans-serif;font-size:.8rem;letter-spacing:.04em;text-transform:uppercase}
.prose tbody tr:last-child td{border-bottom:none}
.prose tbody tr:nth-child(even){background:var(--cream)}

/* callouts */
.callout{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px;margin:1.4em 0;box-shadow:var(--shadow)}
.callout.key{border-left:4px solid var(--red)}
.callout h4{color:var(--navy);margin-bottom:.4em;font-family:'Inter',sans-serif;font-weight:700;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase}
.callout ul{margin:.4em 0 0 1.1em}

/* inline CTA */
.cta-band{background:linear-gradient(135deg,var(--red),#8a1230);color:#fff;border-radius:var(--radius);padding:30px 34px;margin:2em 0;text-align:center;box-shadow:var(--shadow)}
.cta-band h3{color:#fff;font-size:1.45rem;margin-bottom:.3em}
.cta-band p{color:#ffe1e7;margin-bottom:1em;max-width:52ch;margin-left:auto;margin-right:auto}
.cta-band .btn-bronze{background:var(--bronze);color:#241d17}
.cta-band .btn-bronze:hover{background:var(--bronze-2)}

/* FAQ */
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;margin:.6em 0;box-shadow:0 6px 20px -14px rgba(10,25,40,.3)}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:600;color:var(--navy);list-style:none;position:relative}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:'+';position:absolute;right:20px;color:var(--red);font-size:1.3rem;line-height:1}
.faq details[open] summary::after{content:'–'}
.faq details p{padding:0 20px 16px}

/* ---------- SIDEBAR ---------- */
.aside{position:sticky;top:88px;display:flex;flex-direction:column;gap:20px}
.card-side{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.card-side h4{color:var(--navy);font-size:1rem;margin-bottom:.7em}
.card-side.dark{background:var(--navy);color:#fff}
.card-side.dark h4{color:#fff}
.card-side.dark p{color:#cdd8e6;font-size:.9rem;margin-bottom:1em}
.side-links li{list-style:none;padding:9px 0;border-bottom:1px dashed var(--line);font-size:.92rem}
.side-links li:last-child{border-bottom:none}
.side-links a{color:var(--char-2)}
.side-links a:hover{color:var(--red)}
.tag{display:inline-block;font-size:.72rem;font-weight:600;letter-spacing:.05em;text-transform:uppercase;padding:.35em .8em;border-radius:999px;background:rgba(176,141,87,.16);color:#8a6a38;margin:0 6px 6px 0}

/* ---------- RELATED ---------- */
.related{border-top:1px solid var(--line);padding:36px 0}
.related h2{font-size:1.5rem;margin-bottom:18px}
.rel-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:20px}
.rel-card{background:#fff;border:1px solid var(--line);border-radius:14px;overflow:hidden;box-shadow:var(--shadow);transition:.2s}
.rel-card:hover{transform:translateY(-4px)}
.rel-card .rc-top{height:8px;background:linear-gradient(90deg,var(--red),var(--bronze))}
.rel-card .rc-body{padding:18px}
.rel-card .eyebrow{font-size:.68rem}
.rel-card h3{font-size:1.05rem;margin:.35em 0;color:var(--navy)}
.rel-card p{font-size:.88rem;color:var(--muted)}

/* ---------- BLOG INDEX ---------- */
.blog-hero{background:linear-gradient(160deg,var(--navy),var(--char));color:#fff;padding:60px 0;text-align:center}
.blog-hero h1{color:#fff;font-size:clamp(2rem,5vw,3.2rem)}
.blog-hero p{color:#c3ccd9;max-width:60ch;margin:.7em auto 0}
.filterbar{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;padding:26px 0}
.filterbar button{background:#fff;border:1px solid var(--line);color:var(--char-2);padding:.5em 1.1em;border-radius:999px;font-family:inherit;font-weight:600;font-size:.85rem;cursor:pointer;transition:.2s}
.filterbar button.on,.filterbar button:hover{background:var(--navy);color:#fff;border-color:var(--navy)}
.post-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:26px;padding:8px 0 60px}
.post-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.post-card:hover{transform:translateY(-5px)}
.post-card .pc-media{aspect-ratio:16/9;overflow:hidden;background:var(--navy)}
.post-card .pc-media img{width:100%;height:100%;object-fit:cover}
.post-card .pc-body{padding:20px;display:flex;flex-direction:column;gap:8px;flex:1}
.post-card h3{font-size:1.15rem;color:var(--navy)}
.post-card p{font-size:.9rem;color:var(--muted);flex:1}
.post-card .pc-foot{font-size:.8rem;color:var(--bronze);font-weight:600}

/* ---------- FOOTER ---------- */
footer{background:var(--char);color:#c9bfb0;padding:52px 0 26px;margin-top:20px}
footer h4{color:#fff;font-size:.95rem;margin-bottom:.8em}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.3fr;gap:32px}
.foot-logo{font-family:'Playfair Display',serif;font-weight:800;font-size:1.5rem;color:#fff;margin-bottom:.5em}
footer ul{list-style:none}
footer li{padding:5px 0;font-size:.9rem}
footer a{color:#c9bfb0}
footer a:hover{color:#fff}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:32px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:.82rem;color:#9c9284}

/* ---------- WHATSAPP FLOAT ---------- */
.wa-float{position:fixed;right:22px;bottom:22px;z-index:60;width:56px;height:56px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 10px 30px -6px rgba(37,211,102,.6);transition:.2s}
.wa-float:hover{transform:scale(1.08)}
.wa-float svg{width:30px;height:30px;fill:#fff}

/* ---------- RESPONSIVE ---------- */
@media(max-width:900px){
  .article-wrap{grid-template-columns:minmax(0,1fr);gap:30px}
  .aside{position:static;flex-direction:row;flex-wrap:wrap}
  .aside .card-side{flex:1;min-width:240px}
  .menu{display:none}
  .burger{display:block}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:560px){.foot-grid{grid-template-columns:1fr}.aside{flex-direction:column}.blog-lang{max-width:104px;font-size:.78rem;padding:.35em .4em}.nav-cta .btn-primary{display:none}}