/* =====================================================================
   NextX — Pillar /agente-de-ia-no-whatsapp/ | guia SEO
   Mesmo design system: navy + azul da marca NextX · prose + índice
   ===================================================================== */

:root{
  --ink:#05090F;
  --ink-2:#080D16;
  --panel:#0C131F;
  --panel-2:#111A28;
  --line:#1A2434;
  --line-2:#2A3A4E;

  --ivory:#EAF1FB;
  --prose:#C6D2E4;
  --muted:#9DAAC0;
  --faint:#62748E;

  --cyan:#5BD6FF;
  --volt:#3EA8FF;
  --volt-deep:#1C74D6;
  --ink-on-blue:#04101F;
  --wa:#25D366;

  --blue-10:rgba(62,168,255,.10);
  --blue-14:rgba(62,168,255,.14);
  --blue-22:rgba(62,168,255,.22);
  --blue-40:rgba(62,168,255,.40);
  --cyan-30:rgba(91,214,255,.30);
  --signal:linear-gradient(90deg,var(--volt-deep) 0%,var(--volt) 45%,var(--cyan) 100%);

  --display:"Space Grotesk", system-ui, sans-serif;
  --body:"Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono:"IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --maxw:1180px;
  --r:16px;
  --r-sm:12px;
  --ease:cubic-bezier(.16,1,.3,1);
  --ease-spring:cubic-bezier(.34,1.56,.64,1);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--ink);color:var(--prose);font-family:var(--body);font-size:17px;line-height:1.6;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
b{font-weight:700;color:var(--ivory)}
.mono{font-family:var(--mono)}
.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}

.skip{position:absolute;left:-999px;top:0;z-index:200;background:var(--volt);color:var(--ink-on-blue);padding:10px 16px;border-radius:0 0 8px 0;font-weight:700}
.skip:focus{left:0}
.grain{position:fixed;inset:0;z-index:1;pointer-events:none;opacity:.04;mix-blend-mode:overlay;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E")}
.nav,.ghero,.layout,.cta-final,.footer{position:relative;z-index:2}

/* ===== Comuns ===== */
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--volt);margin-bottom:18px}
.eyebrow__tick{width:7px;height:7px;border-radius:2px;background:var(--cyan);box-shadow:0 0 10px var(--cyan)}
.grad-blue{background:var(--signal);-webkit-background-clip:text;background-clip:text;color:transparent}
.section-lead{font-size:1.04rem;color:var(--muted);max-width:62ch;margin:0 0 14px}
.section-lead.center{margin-inline:auto;text-align:center}
.tick{color:var(--volt);font-weight:700;flex:0 0 auto}

.btn{position:relative;isolation:isolate;display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  font-family:var(--body);font-weight:600;font-size:.95rem;padding:14px 26px;border-radius:12px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s var(--ease),box-shadow .25s var(--ease),color .25s,border-color .25s;white-space:nowrap}
.btn--primary{color:var(--ink-on-blue);background:linear-gradient(180deg,var(--cyan),var(--volt));
  box-shadow:inset 0 1px 0 rgba(255,255,255,.4),0 10px 28px -10px var(--blue-40)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:inset 0 1px 0 rgba(255,255,255,.5),0 14px 36px -10px var(--blue-40),0 0 0 1px var(--cyan-30)}
.btn--ghost{background:transparent;color:var(--muted);border-color:var(--line-2)}
.btn--ghost:hover{color:var(--ivory);border-color:var(--volt);transform:translateY(-2px)}
.btn--sm{padding:10px 18px;font-size:.85rem}
.btn--lg{padding:17px 32px;font-size:1.02rem}
.btn--block{display:flex;width:100%}
.btn__arrow{transition:transform .25s var(--ease)}
.btn:hover .btn__arrow{transform:translateX(4px)}
.btn:active{transform:translateY(1px) scale(.99)}

/* ===== Nav ===== */
.nav{position:sticky;top:0;z-index:60;border-bottom:1px solid transparent;transition:background .3s,border-color .3s,backdrop-filter .3s}
.nav.scrolled{background:rgba(8,13,22,.82);backdrop-filter:blur(14px) saturate(1.2);border-bottom-color:var(--line)}
.nav__inner{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand__mark{font-family:var(--display);font-weight:700;font-size:1.3rem;letter-spacing:-.02em;display:inline-flex}
.brand__next{background:linear-gradient(180deg,#fff,#9aa6b2);-webkit-background-clip:text;background-clip:text;color:transparent}
.brand__x{color:var(--volt);font-style:italic;text-shadow:0 0 16px var(--blue-40)}
.brand__suffix{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);padding-left:12px;border-left:1px solid var(--line-2)}
.nav__links{display:flex;gap:26px}
.nav__links a{font-family:var(--mono);font-size:.78rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);transition:color .2s}
.nav__links a:hover{color:var(--ivory)}
.nav__burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:8px}
.nav__burger span{width:24px;height:2px;background:var(--ivory);border-radius:2px;transition:.3s}

/* ===== Hero do guia ===== */
.ghero{position:relative;overflow:hidden;isolation:isolate;padding:56px 0 40px;border-bottom:1px solid var(--line)}
.ghero__glow{position:absolute;inset:0;z-index:-1;background:radial-gradient(70% 60% at 20% -10%,var(--blue-22),transparent 60%)}
.crumb{font-size:.7rem;letter-spacing:.04em;color:var(--faint);margin-bottom:18px;display:flex;gap:8px;flex-wrap:wrap}
.crumb a{color:var(--muted)}.crumb a:hover{color:var(--cyan)}
.ghero__title{font-family:var(--display);font-weight:700;font-size:clamp(2rem,4.6vw,3.2rem);line-height:1.06;letter-spacing:-.025em;
  color:var(--ivory);margin:0 0 22px;max-width:20ch}
.ghero__lede{font-size:1.1rem;color:var(--muted);max-width:68ch;margin:0 0 14px}
.ghero__meta{display:flex;gap:18px;flex-wrap:wrap;font-size:.7rem;letter-spacing:.04em;color:var(--faint);margin:22px 0 26px}
.ghero__cta{display:flex;flex-wrap:wrap;gap:14px}

/* ===== Layout: índice + artigo ===== */
.layout{display:grid;grid-template-columns:236px minmax(0,1fr);gap:56px;padding-top:54px;padding-bottom:40px;align-items:start}

.toc{position:sticky;top:88px}
.toc__inner{border:1px solid var(--line);border-radius:var(--r);background:linear-gradient(180deg,var(--panel),var(--ink));padding:20px}
.toc__title{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--faint);margin:0 0 14px}
.toc nav{display:flex;flex-direction:column;gap:2px}
.toc nav a{font-size:.86rem;color:var(--muted);padding:7px 10px;border-radius:8px;border-left:2px solid transparent;transition:color .2s,background .2s,border-color .2s}
.toc nav a:hover{color:var(--ivory);background:var(--blue-10)}
.toc nav a.is-active{color:var(--cyan);border-left-color:var(--cyan);background:var(--blue-10)}
.toc__cta{margin-top:16px}

/* ===== Prose ===== */
.prose{max-width:760px}
.prose section{margin-bottom:14px;padding-bottom:30px;border-bottom:1px solid var(--line)}
.prose section:last-child{border-bottom:0}
.prose h2{font-family:var(--display);font-weight:700;font-size:clamp(1.5rem,2.8vw,2rem);line-height:1.15;letter-spacing:-.02em;
  color:var(--ivory);margin:34px 0 16px;scroll-margin-top:92px;position:relative;padding-top:10px}
.prose h2::before{content:"";position:absolute;top:-6px;left:0;width:38px;height:3px;background:var(--signal);border-radius:2px;box-shadow:0 0 12px var(--cyan)}
.prose h3{font-family:var(--display);font-weight:600;font-size:1.18rem;color:var(--ivory);margin:26px 0 10px;letter-spacing:-.01em}
.prose p{font-size:1.06rem;line-height:1.72;color:var(--prose);margin:0 0 16px}
.prose b{color:var(--ivory)}

.prose__list{list-style:none;margin:0 0 18px;padding:0;display:flex;flex-direction:column;gap:13px}
.prose__list li{display:flex;gap:11px;align-items:flex-start;font-size:1.04rem;line-height:1.6;color:var(--prose)}
.prose__ol{margin:0 0 18px;padding-left:22px;display:flex;flex-direction:column;gap:12px}
.prose__ol li{font-size:1.04rem;line-height:1.6;color:var(--prose);padding-left:6px}
.prose__ol li::marker{color:var(--cyan);font-weight:700;font-family:var(--mono)}

/* passo a passo numerado */
.steps-ol{list-style:none;margin:6px 0 18px;padding:0;display:flex;flex-direction:column;gap:14px;counter-reset:none}
.steps-ol li{display:flex;gap:16px;align-items:flex-start;background:linear-gradient(180deg,var(--panel),var(--ink));
  border:1px solid var(--line);border-radius:var(--r-sm);padding:16px 18px;font-size:1.02rem;line-height:1.55;color:var(--prose)}
.steps-ol__n{flex:0 0 auto;width:34px;height:34px;border-radius:9px;display:grid;place-items:center;
  font-size:.82rem;font-weight:700;color:var(--cyan);background:var(--blue-10);border:1px solid var(--line-2)}

/* link "leia mais" */
.readmore{margin:6px 0 4px}
.readmore a{display:inline-flex;align-items:center;gap:8px;font-weight:600;color:var(--cyan);font-size:.98rem;
  border-bottom:1px solid var(--blue-40);padding-bottom:2px;transition:border-color .2s}
.readmore a:hover{border-color:var(--cyan)}

/* links inline na prose */
.prose p a:not(.readmore a){color:var(--cyan);border-bottom:1px solid var(--blue-40)}

/* ===== Tabela comparativa ===== */
.ptable-wrap{overflow-x:auto;margin:8px 0 20px;border:1px solid var(--line-2);border-radius:var(--r)}
.ptable{width:100%;border-collapse:collapse;min-width:520px;font-size:.95rem}
.ptable th,.ptable td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--line)}
.ptable thead th{font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;text-transform:uppercase;color:var(--faint);background:var(--ink-2)}
.ptable thead th.hl{color:var(--cyan)}
.ptable tbody td:first-child{color:var(--ivory);font-weight:500}
.ptable td.hl{background:var(--blue-10)}
.ptable tbody tr:last-child td{border-bottom:0}
.ptable .yes{color:var(--cyan);font-weight:600}
.ptable .lim{color:var(--muted)}
.ptable .no{color:#7d8aa0}

/* ===== Nichos ===== */
.niche{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:10px 0 20px}
.niche__card{display:flex;flex-direction:column;background:linear-gradient(180deg,var(--panel),var(--ink));
  border:1px solid var(--line);border-radius:var(--r);padding:22px 20px;transition:transform .3s var(--ease),border-color .3s,box-shadow .3s}
.niche__card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:0 24px 50px -28px #000,0 0 30px -18px var(--blue-40)}
.niche__tag{font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;color:var(--volt);margin-bottom:10px}
.niche__card h3{font-family:var(--display);font-size:1.04rem;font-weight:600;color:var(--ivory);margin:0 0 7px;letter-spacing:-.01em}
.niche__card p{font-size:.9rem;color:var(--muted);margin:0 0 14px;line-height:1.5}
.niche__more{margin-top:auto;font-size:.7rem;letter-spacing:.04em;text-transform:uppercase;color:var(--cyan)}

/* ===== FAQ ===== */
.faq__list{display:flex;flex-direction:column;gap:12px;margin-top:8px}
.faq__item{background:linear-gradient(180deg,var(--panel),var(--ink));border:1px solid var(--line);border-radius:var(--r-sm);overflow:hidden;transition:border-color .25s}
.faq__item[open]{border-color:var(--line-2)}
.faq__item summary{cursor:pointer;list-style:none;padding:18px 22px;font-weight:600;font-size:1rem;color:var(--ivory);
  display:flex;justify-content:space-between;align-items:center;gap:16px}
.faq__item summary::-webkit-details-marker{display:none}
.faq__item summary::after{content:"+";font-family:var(--display);font-size:1.4rem;color:var(--volt);transition:transform .3s;line-height:1}
.faq__item[open] summary::after{transform:rotate(45deg)}
.faq__a{padding:0 22px 20px;color:var(--muted);font-size:.96rem;line-height:1.6}

/* ===== CTA final ===== */
.cta-final{padding:88px 0}
.cta-final__box{position:relative;overflow:hidden;text-align:center;background:linear-gradient(180deg,#0d1a2c,#05090f);
  border:1px solid var(--line-2);border-radius:26px;padding:60px 40px;box-shadow:0 50px 100px -40px #000}
.cta-final__glow{position:absolute;top:-44%;left:50%;transform:translateX(-50%);width:700px;height:520px;
  background:radial-gradient(50% 50% at 50% 50%,var(--blue-22),transparent 70%);filter:blur(18px);pointer-events:none}
.cta-final__box>*{position:relative}
.cta-final__box .eyebrow{margin-inline:auto}
.cta-final__title{font-family:var(--display);font-weight:700;font-size:clamp(1.8rem,4vw,2.8rem);line-height:1.08;letter-spacing:-.02em;margin:0 0 18px;color:var(--ivory)}
.cta-final__box .section-lead{margin-bottom:28px}
.cta-final__micro{margin-top:18px;color:var(--faint);font-size:.72rem;letter-spacing:.04em;text-transform:uppercase}

/* ===== Footer ===== */
.footer{background:var(--ink-2);border-top:1px solid var(--line);padding:54px 0 26px}
.footer__inner{display:grid;grid-template-columns:1.3fr 2fr;gap:48px}
.footer__brand .brand__mark{font-family:var(--display);font-weight:700;font-size:1.3rem;margin-bottom:14px;display:inline-flex;letter-spacing:-.02em}
.footer__brand p{color:var(--muted);font-size:.92rem;max-width:42ch}
.footer__cols{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.footer__col h4{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--volt);margin:0 0 16px}
.footer__col a{display:block;color:var(--muted);font-size:.9rem;margin-bottom:10px;transition:color .2s}
.footer__col a:hover{color:var(--cyan)}
.footer__bottom{border-top:1px solid var(--line);margin-top:42px;padding-top:22px}
.footer__bottom-inner{display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:.68rem;letter-spacing:.03em;color:var(--faint)}
.footer__legal{max-width:48ch}

/* ===== Sticky CTA mobile + WA float ===== */
.cta-bar{position:fixed;left:0;right:0;bottom:0;z-index:50;display:flex;padding:12px 16px calc(12px + env(safe-area-inset-bottom));
  background:linear-gradient(180deg,rgba(5,9,15,0),rgba(5,9,15,.94) 32%);backdrop-filter:blur(8px);
  transform:translateY(130%);transition:transform .4s var(--ease)}
.cta-bar.show{transform:translateY(0)}
.cta-bar .btn{flex:1}
@media (min-width:768px){.cta-bar{display:none}}
.wa-float{position:fixed;right:18px;bottom:calc(82px + env(safe-area-inset-bottom));z-index:49;width:56px;height:56px;border-radius:50%;
  display:grid;place-items:center;color:#04140A;background:var(--wa);box-shadow:0 12px 30px -10px rgba(0,0,0,.6);transition:transform .2s var(--ease-spring)}
.wa-float:hover{transform:scale(1.06)}
.wa-float::before{content:"";position:absolute;inset:0;border-radius:50%;box-shadow:0 0 0 0 rgba(37,211,102,.55);animation:ring 2.4s var(--ease) infinite}
@keyframes ring{to{box-shadow:0 0 0 18px rgba(37,211,102,0)}}
@media (min-width:768px){.wa-float{right:24px;bottom:24px}}

/* ===== Reveal ===== */
.rv{opacity:0;transform:translateY(20px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.rv.in{opacity:1;transform:none}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}
.btn--primary:focus-visible,.wa-float:focus-visible{outline:2px solid #fff;outline-offset:3px}

/* ===== Responsivo ===== */
@media (max-width:900px){
  .layout{grid-template-columns:1fr;gap:0;padding-top:34px}
  .toc{position:static;margin-bottom:30px}
  .toc__inner{padding:18px 20px}
  .toc nav{flex-flow:row wrap;gap:6px}
  .toc nav a{border-left:0;border:1px solid var(--line);font-size:.8rem;padding:7px 12px}
  .toc nav a.is-active{border-color:var(--cyan)}
  .toc__cta{display:none}
  .prose{max-width:none}
  .niche{grid-template-columns:1fr}
  .footer__inner{grid-template-columns:1fr;gap:32px}
}
@media (max-width:760px){
  .nav__links{position:fixed;inset:68px 0 auto 0;flex-direction:column;gap:0;background:rgba(5,9,15,.97);backdrop-filter:blur(14px);
    border-bottom:1px solid var(--line);padding:8px 0;transform:translateY(-130%);transition:transform .35s var(--ease);z-index:55}
  .nav__links.open{transform:none}
  .nav__links a{padding:15px 24px;border-bottom:1px solid var(--line)}
  .nav__burger{display:flex}
  .nav__cta{display:none}
  .footer__cols{grid-template-columns:1fr 1fr}
  .footer__bottom-inner{flex-direction:column}
  .cta-final{padding:60px 0}
  .cta-final__box{padding:42px 22px}
}
@media (max-width:420px){
  body{font-size:16px}
  .footer__cols{grid-template-columns:1fr}
}

@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important;scroll-behavior:auto!important}
  .rv{opacity:1;transform:none}
}