/* blog.css — Blog técnico Quality College México (independiente de Tailwind)
   Paleta: dark #0a0f1e · primary #1a3470 · accent #0ea5e9 · gold #f59e0b */
:root{--bp-dark:#0a0f1e;--bp-navy:#111a33;--bp-primary:#1a3470;--bp-accent:#0ea5e9;--bp-gold:#f59e0b;--bp-ink:#1d2742;--bp-text:#3b4560;--bp-muted:#66708a;--bp-line:#e3e8f1;--bp-soft:#f5f7fb;--bp-head:'Sora',system-ui,sans-serif;--bp-body:'Inter',system-ui,-apple-system,'Segoe UI',sans-serif;--bp-radius:16px}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body.bp{margin:0;font-family:var(--bp-body);color:var(--bp-text);background:#fff;font-size:17px;line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:clip}
.bp img{max-width:100%;height:auto}
.bp a{color:var(--bp-primary)}
.bp svg{width:1em;height:1em;flex-shrink:0}
.bp-wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.bp-wrap{padding:0 32px}}

/* ---------- Hero ---------- */
.bp-hero{position:relative;background:radial-gradient(1200px 500px at 85% -10%,rgba(14,165,233,.22),transparent 60%),radial-gradient(900px 400px at 0% 120%,rgba(245,158,11,.10),transparent 60%),linear-gradient(160deg,#0a0f1e 0%,#111a33 55%,#1a3470 120%);color:#fff;padding:44px 0 56px;overflow:hidden}
.bp-hero::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:44px 44px;mask-image:linear-gradient(to bottom,#000,transparent 85%);pointer-events:none}
.bp-hero .bp-wrap{position:relative;max-width:1040px}
@media(min-width:1100px){.bp-hero{padding:64px 0 76px}}
.bp-crumbs ol{list-style:none;display:flex;flex-wrap:wrap;gap:6px;margin:0 0 22px;padding:0;font-size:13.5px;color:#9fb0cf}
.bp-crumbs li+li::before{content:"/";margin-right:6px;color:#53628a}
.bp-crumbs a{color:#c9d5ec;text-decoration:none}.bp-crumbs a:hover{color:#fff}
.bp-crumbs [aria-current]{color:var(--bp-gold);font-weight:600}
.bp-badges{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:18px}
.bp-badge{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;letter-spacing:.02em;padding:6px 12px;border-radius:999px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:#dbe5f7}
.bp-badge--gold{background:rgba(245,158,11,.14);border-color:rgba(245,158,11,.4);color:#fcd27b}
.bp-hero h1{font-family:var(--bp-head);font-weight:800;font-size:clamp(30px,4.6vw,50px);line-height:1.12;letter-spacing:-.02em;margin:0 0 18px;color:#fff;text-wrap:balance}
.bp-lead{font-size:clamp(17px,1.6vw,19.5px);line-height:1.6;color:#c6d2e8;max-width:820px;margin:0 0 26px}
.bp-meta{display:flex;flex-wrap:wrap;align-items:center;gap:14px 26px;font-size:14px;color:#aebcd8}
.bp-meta>span{display:inline-flex;align-items:center;gap:8px}
.bp-meta svg{color:var(--bp-accent);width:16px;height:16px}
.bp-author{gap:12px!important}
.bp-author__ico{width:40px;height:40px;border-radius:12px;background:rgba(14,165,233,.15);border:1px solid rgba(14,165,233,.35);display:inline-flex;align-items:center;justify-content:center}
.bp-author__ico svg{width:20px!important;height:20px!important}
.bp-author b{display:block;color:#fff;font-weight:600;font-size:14.5px;line-height:1.3}
.bp-author small{display:block;font-size:12.5px;color:#93a3c4}

/* ---------- Layout ---------- */
.bp-layout{display:grid;grid-template-columns:minmax(0,1fr);gap:28px;padding-top:28px;padding-bottom:72px}
@media(min-width:1100px){.bp-layout{grid-template-columns:270px minmax(0,1fr);gap:56px;padding-top:48px}}
.bp-main{max-width:800px;min-width:0}
.bp-aside{min-width:0}
@media(min-width:1100px){.bp-aside{position:sticky;top:132px;align-self:start;max-height:calc(100vh - 150px);overflow:auto;scrollbar-width:thin}}
.bp-toc{border:1px solid var(--bp-line);border-radius:var(--bp-radius);background:#fff;box-shadow:0 1px 2px rgba(10,15,30,.04)}
.bp-toc summary{display:flex;align-items:center;gap:10px;padding:14px 16px;font-family:var(--bp-head);font-weight:700;font-size:14.5px;color:var(--bp-ink);cursor:pointer;list-style:none}
.bp-toc summary::-webkit-details-marker{display:none}
.bp-toc summary svg:first-child{color:var(--bp-accent)}
.bp-toc summary span{flex:1}
.bp-toc summary svg:last-child{color:var(--bp-muted);transition:transform .2s}
.bp-toc[open] summary svg:last-child{transform:rotate(180deg)}
.bp-toc ol{list-style:none;margin:0;padding:4px 10px 12px;counter-reset:t;border-top:1px solid var(--bp-line)}
.bp-toc li{counter-increment:t}
.bp-toc a{display:flex;gap:10px;padding:7px 8px;border-radius:8px;font-size:13.5px;line-height:1.4;color:var(--bp-text);text-decoration:none;border-left:2px solid transparent}
.bp-toc a::before{content:counter(t,decimal-leading-zero);font-weight:700;font-size:11.5px;color:#9aa6bf;padding-top:1px}
.bp-toc a:hover{background:var(--bp-soft);color:var(--bp-primary)}
.bp-toc a.is-active{background:#eef4ff;color:var(--bp-primary);font-weight:600;border-left-color:var(--bp-gold)}
.bp-side-cta{display:none;margin-top:18px;padding:20px;border-radius:var(--bp-radius);background:linear-gradient(160deg,#0a0f1e,#1a3470);color:#fff}
@media(min-width:1100px){.bp-side-cta{display:block}}
.bp-side-cta__eyebrow{margin:0 0 6px;font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--bp-gold);font-weight:700}
.bp-side-cta__title{margin:0 0 14px;font-family:var(--bp-head);font-weight:700;font-size:16px;line-height:1.35}
.bp-side-cta .bp-btn{width:100%;justify-content:center;margin-top:8px}

/* ---------- Buttons / chips ---------- */
.bp-btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:12px;font-weight:700;font-size:14.5px;text-decoration:none!important;transition:transform .15s,box-shadow .2s,background .2s;border:1px solid transparent;line-height:1.2}
.bp-btn:hover{transform:translateY(-1px)}
.bp-btn--gold{background:linear-gradient(135deg,#fbbf24,#f59e0b);color:#111a33!important;box-shadow:0 10px 24px -10px rgba(245,158,11,.7)}
.bp-btn--ghost{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.2);color:#fff!important}
.bp-btn--light{background:#fff;color:var(--bp-primary)!important}
.bp-btn svg{width:16px;height:16px}
.bp-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.bp-chip{display:inline-flex;align-items:center;gap:6px;padding:7px 12px;border-radius:999px;border:1px solid var(--bp-line);background:#fff;font-size:13px;font-weight:600;color:var(--bp-primary);text-decoration:none}
.bp-chip:hover{border-color:var(--bp-primary)}
.bp-chip svg{width:13px;height:13px}

/* ---------- Key takeaways ---------- */
.bp-keys{border:1px solid #d9e6fb;background:linear-gradient(180deg,#f3f8ff,#fff);border-radius:var(--bp-radius);padding:22px 24px;margin-bottom:36px}
.bp-keys__title{margin:0 0 10px;font-family:var(--bp-head);font-weight:700;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--bp-primary)}
.bp-keys ul{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.bp-keys li{display:flex;gap:10px;font-size:15.5px;line-height:1.55;color:var(--bp-ink)}
.bp-keys li svg{width:20px;height:20px;color:#fff;background:var(--bp-accent);border-radius:50%;padding:4px;margin-top:2px}

/* ---------- Article typography ---------- */
.bp-content{color:var(--bp-text)}
.bp-content>*:first-child{margin-top:0}
.bp-content h2,.bp-faq h2,.bp-refs h2,.bp-related h2{font-family:var(--bp-head);font-weight:800;color:var(--bp-ink);font-size:clamp(23px,2.4vw,29px);line-height:1.25;letter-spacing:-.015em;margin:56px 0 16px;scroll-margin-top:140px;position:relative;padding-top:18px}
.bp-content h2::before,.bp-faq h2::before,.bp-refs h2::before,.bp-related h2::before{content:"";position:absolute;top:0;left:0;width:44px;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--bp-gold),#fbbf24)}
.bp-content h3{font-family:var(--bp-head);font-weight:700;color:var(--bp-ink);font-size:20px;line-height:1.35;margin:34px 0 10px;scroll-margin-top:140px}
.bp-content h4{font-family:var(--bp-head);font-weight:700;color:var(--bp-ink);font-size:16.5px;margin:24px 0 8px}
.bp-content p{margin:0 0 18px}
.bp-content strong{color:var(--bp-ink);font-weight:650}
.bp-content ul,.bp-content ol{margin:0 0 22px;padding-left:22px}
.bp-content li{margin:6px 0;padding-left:4px}
.bp-content li::marker{color:var(--bp-accent);font-weight:700}
.bp-content a{color:var(--bp-primary);font-weight:600;text-decoration:underline;text-decoration-color:rgba(26,52,112,.3);text-underline-offset:3px}
.bp-content a:hover{text-decoration-color:var(--bp-primary)}
.bp-content code{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.88em;background:var(--bp-soft);border:1px solid var(--bp-line);padding:1px 6px;border-radius:6px;color:var(--bp-ink)}
.bp-content abbr{text-decoration:underline dotted;cursor:help}
.bp-content hr{border:0;height:1px;background:var(--bp-line);margin:40px 0}
.bp-content figure{margin:28px 0}
.bp-content figcaption{font-size:13.5px;color:var(--bp-muted);margin-top:8px}

/* Tables */
.table-wrap{margin:24px 0 30px;overflow-x:auto;border:1px solid var(--bp-line);border-radius:14px;-webkit-overflow-scrolling:touch;box-shadow:0 1px 2px rgba(10,15,30,.04)}
.table-wrap table{width:100%;border-collapse:collapse;font-size:14.5px;line-height:1.5;min-width:560px}
.table-wrap caption{caption-side:top;text-align:left;padding:14px 16px 0;font-weight:700;color:var(--bp-ink);font-size:14px}
.table-wrap thead th{background:var(--bp-navy);color:#fff;font-weight:600;text-align:left;padding:12px 14px;font-size:13.5px;white-space:nowrap}
.table-wrap td{padding:12px 14px;border-top:1px solid var(--bp-line);vertical-align:top}
.table-wrap tbody tr:nth-child(even) td{background:#f8fafd}
.table-wrap td:first-child{font-weight:600;color:var(--bp-ink)}

/* Callouts */
.callout{position:relative;margin:28px 0;padding:18px 20px 18px 22px;border-radius:14px;border:1px solid;font-size:15.5px;line-height:1.65}
.callout>*:last-child{margin-bottom:0}
.callout p{margin:0 0 10px}
.callout-title{font-family:var(--bp-head);font-weight:700;font-size:14px!important;letter-spacing:.04em;text-transform:uppercase;margin-bottom:8px!important}
.callout-info{background:#f1f7ff;border-color:#cfe2fb}.callout-info .callout-title{color:var(--bp-primary)}
.callout-tip{background:#effcf6;border-color:#bfead6}.callout-tip .callout-title{color:#047857}
.callout-warn{background:#fff8eb;border-color:#f6dca6}.callout-warn .callout-title{color:#b45309}
.callout-norma{background:#f6f4ff;border-color:#dcd5fb}.callout-norma .callout-title{color:#5b21b6}
.callout::before{content:"";position:absolute;left:0;top:14px;bottom:14px;width:4px;border-radius:0 4px 4px 0;background:currentColor;opacity:.0}
.callout-info{box-shadow:inset 4px 0 0 var(--bp-accent)}.callout-tip{box-shadow:inset 4px 0 0 #10b981}.callout-warn{box-shadow:inset 4px 0 0 var(--bp-gold)}.callout-norma{box-shadow:inset 4px 0 0 #7c3aed}

/* Steps */
ol.steps{list-style:none;counter-reset:s;padding:0;margin:26px 0 30px;display:grid;gap:14px}
ol.steps>li{counter-increment:s;position:relative;padding:16px 18px 16px 70px;border:1px solid var(--bp-line);border-radius:14px;background:#fff;margin:0}
ol.steps>li::before{content:counter(s,decimal-leading-zero);position:absolute;left:16px;top:16px;width:38px;height:38px;border-radius:10px;background:linear-gradient(135deg,var(--bp-primary),#2a4d9c);color:#fff;font-family:var(--bp-head);font-weight:800;font-size:14px;display:flex;align-items:center;justify-content:center}
ol.steps>li>strong:first-child{display:block;font-family:var(--bp-head);color:var(--bp-ink);margin-bottom:4px}

/* Checklist */
ul.checklist{list-style:none;padding:0;margin:22px 0 28px;display:grid;gap:10px}
ul.checklist>li{position:relative;padding:12px 14px 12px 46px;border:1px solid var(--bp-line);border-radius:12px;background:#fff;margin:0}
ul.checklist>li::before{content:"";position:absolute;left:14px;top:14px;width:20px;height:20px;border-radius:6px;border:2px solid var(--bp-accent);background:#fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%230ea5e9' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/14px no-repeat}

/* Formula / example / grid cards */
.formula{margin:22px 0;padding:16px 20px;border-radius:12px;background:var(--bp-navy);color:#e6eeff;font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:15px;line-height:1.7;overflow-x:auto;white-space:pre-wrap}
.formula b,.formula strong{color:#fcd27b}
.example{margin:30px 0;padding:22px 24px;border-radius:var(--bp-radius);background:linear-gradient(180deg,#fbfcfe,#f4f7fc);border:1px dashed #b9c6de}
.example>*:last-child{margin-bottom:0}
.example-title{font-family:var(--bp-head);font-weight:800;color:var(--bp-primary);font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin:0 0 10px!important}
.grid-2{display:grid;gap:16px;margin:24px 0 30px}
@media(min-width:700px){.grid-2{grid-template-columns:1fr 1fr}}
.grid-2 .card,.card{border:1px solid var(--bp-line);border-radius:14px;padding:18px 20px;background:#fff;box-shadow:0 1px 2px rgba(10,15,30,.04)}
.card h4{margin-top:0}
.card>*:last-child{margin-bottom:0}

/* ---------- FAQ / refs / author / CTA ---------- */
.bp-faq details{border:1px solid var(--bp-line);border-radius:14px;background:#fff;margin:10px 0;overflow:hidden}
.bp-faq summary{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:16px 18px;cursor:pointer;font-weight:600;color:var(--bp-ink);font-size:16px;list-style:none}
.bp-faq summary::-webkit-details-marker{display:none}
.bp-faq summary svg{color:var(--bp-muted);transition:transform .2s;width:18px;height:18px}
.bp-faq details[open] summary svg{transform:rotate(180deg)}
.bp-faq details>div{padding:0 18px 18px;font-size:15.5px;color:var(--bp-text)}
.bp-refs ul{list-style:none;padding:0;margin:0 0 16px;display:grid;gap:8px}
.bp-refs li{display:flex;gap:10px;font-size:14.5px;line-height:1.5}
.bp-refs li svg{color:var(--bp-accent);margin-top:4px}
.bp-disclaimer{font-size:13px;color:var(--bp-muted);background:var(--bp-soft);border-radius:12px;padding:12px 14px}
.bp-authorbox{display:flex;gap:16px;margin:48px 0 0;padding:22px;border:1px solid var(--bp-line);border-radius:var(--bp-radius);background:var(--bp-soft)}
.bp-authorbox__ico{width:52px;height:52px;border-radius:14px;flex-shrink:0;background:linear-gradient(135deg,var(--bp-primary),var(--bp-accent));color:#fff;display:flex;align-items:center;justify-content:center}
.bp-authorbox__ico svg{width:26px;height:26px}
.bp-authorbox p{margin:0;font-size:14.5px;line-height:1.6}
.bp-authorbox__name{font-family:var(--bp-head);font-weight:700;color:var(--bp-ink);font-size:16px!important;margin-bottom:4px!important}
.bp-cta{margin:44px 0 0;padding:30px;border-radius:20px;color:#fff;background:radial-gradient(600px 240px at 100% 0,rgba(14,165,233,.3),transparent 60%),linear-gradient(150deg,#0a0f1e,#1a3470);display:grid;gap:20px}
@media(min-width:800px){.bp-cta{grid-template-columns:1.4fr 1fr;align-items:center;padding:36px 40px}}
.bp-cta__eyebrow{margin:0 0 6px;font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--bp-gold);font-weight:700}
.bp-cta h2{font-family:var(--bp-head);font-weight:800;font-size:24px;line-height:1.25;margin:0 0 8px;color:#fff}
.bp-cta p{margin:0;color:#c6d2e8;font-size:15.5px}
.bp-cta__actions{display:flex;flex-direction:column;gap:10px}
.bp-cta__actions .bp-btn{justify-content:center}
.bp-related__grid{display:grid;gap:14px}
@media(min-width:700px){.bp-related__grid{grid-template-columns:repeat(3,1fr)}}
.bp-card{display:flex;flex-direction:column;gap:8px;padding:18px;border:1px solid var(--bp-line);border-radius:14px;background:#fff;text-decoration:none!important;transition:box-shadow .2s,transform .2s,border-color .2s}
.bp-card:hover{transform:translateY(-2px);border-color:#c8d4ea;box-shadow:0 16px 30px -18px rgba(10,15,30,.35)}
.bp-card__tag{font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--bp-accent)}
.bp-card__title{font-family:var(--bp-head);font-weight:700;color:var(--bp-ink);font-size:16px;line-height:1.35}
.bp-card__desc{font-size:14px;color:var(--bp-muted);line-height:1.55}
.bp-card__more{margin-top:auto;display:inline-flex;align-items:center;gap:6px;font-size:13.5px;font-weight:700;color:var(--bp-primary)}
.bp-card__more svg{width:14px;height:14px}
.bp-print{margin:30px 0 0;text-align:right}
.bp-print button{display:inline-flex;align-items:center;gap:8px;border:1px solid var(--bp-line);background:#fff;border-radius:10px;padding:9px 14px;font:600 13.5px var(--bp-body);color:var(--bp-text);cursor:pointer}

/* ---------- Index ---------- */
.bp-hero--index h1{max-width:820px}
.bp-search{display:flex;align-items:center;gap:10px;max-width:640px;background:#fff;border-radius:14px;padding:4px 6px 4px 16px;box-shadow:0 20px 40px -20px rgba(0,0,0,.5)}
.bp-search svg{color:var(--bp-muted);width:18px;height:18px}
.bp-search input{flex:1;border:0;outline:0;font:500 15.5px var(--bp-body);padding:12px 6px;color:var(--bp-ink);background:transparent;min-width:0}
.bp-index{padding-top:34px;padding-bottom:80px}
.bp-filters{display:flex;gap:8px;overflow-x:auto;padding-bottom:6px;margin-bottom:26px;scrollbar-width:thin}
.bp-filters button{flex-shrink:0;border:1px solid var(--bp-line);background:#fff;border-radius:999px;padding:9px 15px;font:600 13.5px var(--bp-body);color:var(--bp-text);cursor:pointer;white-space:nowrap}
.bp-filters button.is-active{background:var(--bp-primary);border-color:var(--bp-primary);color:#fff}
.bp-index__grid{display:grid;gap:16px}
@media(min-width:640px){.bp-index__grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.bp-index__grid{grid-template-columns:repeat(3,1fr)}}
.bp-card[hidden]{display:none}
.bp-empty{text-align:center;color:var(--bp-muted);padding:40px 0}

/* ---------- Print ---------- */
@media print{
  .qc-topbar,.qc-header,.qc-footer,.qc-cc,.qc-ccm,.wa-float,.bp-aside,.bp-cta,.bp-related,.bp-print,.bp-search,.bp-filters{display:none!important}
  .bp-hero{background:#fff!important;color:#000;padding:0 0 12px}.bp-hero h1,.bp-lead,.bp-meta,.bp-author b{color:#000!important}
  .bp-layout{display:block;padding:0}.bp-main{max-width:none}
  .table-wrap{overflow:visible}.table-wrap table{min-width:0}
  details{display:block}details>*{display:block}
}