/* ============================================================
   Invel North America — design system
   Concept: reveal the invisible. Thermography as a system, not decoration.
   Palette derived from a thermographic scale, desaturated.
   ============================================================ */
:root{
  --ink:#15171B;      /* text & dark grounds, near-black */
  --paper:#F6F6F3;    /* light ground */
  --carbon:#3F444A;   /* structural grey, secondary text */
  --ember:#ED1C24;    /* Invel red — energy & action ONLY (from the logo) */
  --signal:#F2B600;   /* Invel gold — secondary accent, sparingly */
  --deep:#0F6B60;     /* deep teal — the cool counterpoint (from invel.com.br) */
  --teal:#108474;     /* Invel teal-green */

  --paper-2:#EEEEEA;  /* slightly deeper paper for alt sections */
  --ink-2:#1C1F25;    /* panel on dark */
  --line:#E4E2DB;     /* hairline on paper */
  --line-dk:#2A2E36;  /* hairline on ink */
  --muted:#6D6E71;    /* Invel logo grey */
  --muted-dk:#9AA0A8; /* muted text on ink */

  --display:'Archivo',system-ui,sans-serif;
  --serif:'Source Serif 4',Georgia,serif;
  --mono:'IBM Plex Mono',ui-monospace,monospace;

  --wrap:1180px;
  --radius:14px;
  --shadow:0 1px 2px rgba(20,23,28,.04), 0 18px 40px -24px rgba(20,23,28,.28);
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--serif);font-size:18px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:inherit}
::selection{background:var(--ember);color:#fff}
:focus-visible{outline:2px solid var(--ember);outline-offset:3px;border-radius:3px}

/* ---------- Typography ---------- */
h1,h2,h3,h4,.display{font-family:var(--display);font-weight:800;letter-spacing:-.02em;line-height:1.04;margin:0}
h1{font-size:clamp(2.4rem,6vw,4.6rem)}
h2{font-size:clamp(1.9rem,3.6vw,3rem)}
h3{font-size:clamp(1.3rem,2.2vw,1.7rem);letter-spacing:-.01em}
h4{font-size:1.05rem;letter-spacing:-.01em}
p{margin:0 0 1.1rem}
.lede{font-size:clamp(1.15rem,1.8vw,1.4rem);line-height:1.5;color:var(--carbon)}
.prose{max-width:66ch}
.prose p{margin-bottom:1.3rem}
.mono{font-family:var(--mono);font-weight:500;letter-spacing:.01em}
.eyebrow{font-family:var(--mono);font-size:.72rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--ember)}
.eyebrow.on-ink{color:var(--signal)}
strong{font-weight:600}

/* ---------- Layout ---------- */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section.tight{padding:64px 0}
.on-ink{background:var(--ink);color:var(--paper)}
.on-ink h1,.on-ink h2,.on-ink h3{color:#fff}
.on-ink .lede{color:var(--muted-dk)}
.on-paper-2{background:var(--paper-2)}
.section-head{max-width:44rem;margin-bottom:40px}
.section-head.center{margin-inline:auto;text-align:center}
.section-head h2{margin-top:16px}
.section-head p{margin-top:16px;color:var(--carbon)}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:9px;font-family:var(--display);font-weight:700;
  font-size:.95rem;letter-spacing:-.01em;padding:14px 24px;border-radius:100px;cursor:pointer;
  text-decoration:none;border:1.5px solid transparent;transition:transform .18s ease,background .18s ease,border-color .18s ease,color .18s ease}
.btn:hover{transform:translateY(-2px)}
.btn-primary{background:var(--ember);color:#fff}
.btn-primary:hover{background:#C8141B}
.btn-ghost{border-color:var(--carbon);color:var(--ink)}
.btn-ghost:hover{border-color:var(--ink);background:var(--ink);color:#fff}
.btn-ghost.on-ink{border-color:#454b55;color:#fff}
.btn-ghost.on-ink:hover{background:#fff;color:var(--ink);border-color:#fff}
.btn-lg{padding:16px 30px;font-size:1.02rem}
.arrow{transition:transform .2s ease}
.btn:hover .arrow{transform:translateX(3px)}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(247,245,242,.82);backdrop-filter:saturate(1.4) blur(12px);border-bottom:1px solid var(--line)}
.nav.on-ink-nav{background:rgba(20,23,28,.72);border-bottom:1px solid var(--line-dk)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:70px}
.brand{display:inline-flex;align-items:baseline;gap:2px;font-family:var(--display);font-weight:800;font-size:1.35rem;letter-spacing:-.03em;text-decoration:none;color:var(--ink)}
.on-ink-nav .brand{color:#fff}
.brand .reg{font-size:.7em;color:var(--ember);font-weight:700}
.brand-logo{height:34px;width:auto;display:block}
.footer .brand-logo{height:30px}
.nav-links{display:flex;align-items:center;gap:34px}
.nav-link{font-family:var(--display);font-weight:600;font-size:.95rem;letter-spacing:-.01em;text-decoration:none;color:var(--carbon);transition:color .18s}
.on-ink-nav .nav-link{color:var(--muted-dk)}
.nav-link:hover,.nav-link.active{color:var(--ember)}
.nav-cta{margin-left:6px}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{width:24px;height:2px;background:var(--ink);display:block;transition:.2s}
.on-ink-nav .nav-toggle span{background:#fff}
@media (max-width:900px){
  .nav-links{position:fixed;inset:70px 0 auto;flex-direction:column;align-items:flex-start;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);padding:8px 24px 20px;transform:translateY(-120%);transition:transform .28s ease;box-shadow:var(--shadow)}
  .nav-links.open{transform:translateY(0)}
  .nav-link{padding:14px 0;width:100%;border-bottom:1px solid var(--line);font-size:1.1rem}
  .nav-cta{margin:14px 0 0}
  .nav-toggle{display:flex}
}

/* ---------- Credibility strip ---------- */
.cred{border-top:1px solid var(--line-dk);border-bottom:1px solid var(--line-dk)}
.cred .wrap{padding-top:22px;padding-bottom:22px}
.cred p{margin:0;font-family:var(--mono);font-size:.8rem;letter-spacing:.02em;color:var(--muted-dk);text-align:center;line-height:1.7}
.cred b{color:#fff;font-weight:600}

/* ---------- Cards / grids ---------- */
.grid{display:grid;gap:22px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:28px;transition:border-color .2s ease,transform .2s ease}
.card:hover{border-color:var(--carbon);transform:translateY(-3px)}
.on-ink .card{background:var(--ink-2);border-color:var(--line-dk)}
.card .num{font-family:var(--mono);font-size:.78rem;color:var(--ember);font-weight:600}
.card h3{margin:14px 0 8px}
.card p{margin:0;color:var(--carbon);font-size:1rem;line-height:1.55}
.on-ink .card p{color:var(--muted-dk)}

/* need cards (shop by need) */
.need{display:block;text-decoration:none;background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.need:hover{border-color:var(--ember);transform:translateY(-3px)}
.need .k{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.need h4{margin:10px 0 4px;font-size:1.25rem}
.need .go{font-family:var(--display);font-weight:700;font-size:.9rem;color:var(--ember);margin-top:14px;display:ininline-block}

/* ---------- Split feature ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
@media (max-width:860px){.split{grid-template-columns:1fr;gap:32px}}

/* fiber diagram */
.fiber{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.fiber figure{margin:0}
.fiber .cap{font-family:var(--mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-top:10px}
.fiber .bad .cap{color:var(--muted)}
.fiber .good .cap{color:var(--ember)}

/* thermal gradient rule — cool teal to warm red */
.thermbar{height:4px;border-radius:2px;background:linear-gradient(90deg,var(--deep),#2a9d8f,var(--signal),var(--ember))}

/* ---------- Spectrum graphic ---------- */
.spectrum{background:var(--ink-2);border:1px solid var(--line-dk);border-radius:var(--radius);padding:22px 22px 12px}
.spectrum svg{width:100%;height:auto;display:block}
.spectrum .legend{display:flex;flex-wrap:wrap;gap:16px 26px;margin-top:6px;font-family:var(--mono);font-size:.72rem;color:var(--muted-dk)}
.spectrum .legend i{display:inline-block;width:12px;height:12px;border-radius:3px;margin-right:7px;vertical-align:-1px}
.spectrum .readout{font-family:var(--mono);font-size:.78rem;color:#fff;min-height:1.4em}
.spectrum .readout b{color:var(--signal)}

/* ---------- Disclaimer / legal ---------- */
.disclaimer{font-family:var(--mono);font-size:.72rem;line-height:1.7;color:var(--muted-dk)}
.note{border-left:2px solid var(--carbon);padding:4px 0 4px 16px;font-family:var(--mono);font-size:.78rem;color:var(--muted);line-height:1.6;margin:18px 0}
.on-ink .note{border-color:#454b55;color:var(--muted-dk)}

/* ---------- Footer ---------- */
.footer{background:var(--ink);color:var(--muted-dk);border-top:1px solid var(--line-dk)}
.footer .wrap{padding-top:64px;padding-bottom:40px}
.footer-top{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
@media (max-width:860px){.footer-top{grid-template-columns:1fr 1fr}}
@media (max-width:520px){.footer-top{grid-template-columns:1fr}}
.footer .brand{color:#fff}
.footer h5{font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted-dk);margin:0 0 14px}
.footer a{display:block;text-decoration:none;color:#cfd3d9;font-size:.95rem;padding:5px 0;transition:color .15s}
.footer a:hover{color:var(--ember)}
.footer .addr{font-size:.9rem;line-height:1.7;color:var(--muted-dk)}
.footer-legal{margin-top:44px;padding-top:24px;border-top:1px solid var(--line-dk)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:22px;font-family:var(--mono);font-size:.72rem;color:#6a7078}

/* ---------- Thermal reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(20px);transition:opacity .7s ease,transform .7s ease,filter .7s ease;filter:saturate(.4)}
.reveal.in{opacity:1;transform:none;filter:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;filter:none;transition:none}}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--ink);color:#fff}
.hero::before{content:"";position:absolute;inset:0;background:
  radial-gradient(58% 78% at 84% 16%,rgba(237,28,36,.20),transparent 60%),
  radial-gradient(55% 75% at 5% 98%,rgba(16,107,96,.34),transparent 62%);pointer-events:none}
.hero .wrap{position:relative;padding-top:88px;padding-bottom:88px}
.hero h1{max-width:16ch}
.hero .lede{max-width:44ch;margin-top:22px;color:#d7d9dd}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.kbd{font-family:var(--mono);font-size:.72rem;color:var(--muted-dk);margin-top:22px;letter-spacing:.02em}

/* ---------- Managed background image (only active when an image is uploaded) ---------- */
.has-bg{position:relative;background-size:cover;background-position:center;background-repeat:no-repeat}
.has-bg>*{position:relative;z-index:2}
.has-bg::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none}
.has-bg-dark::after{background:linear-gradient(180deg,rgba(21,23,27,.72),rgba(21,23,27,.85))}
.has-bg-light::after{background:linear-gradient(180deg,rgba(246,246,243,.80),rgba(246,246,243,.90))}

/* utility */
.center{text-align:center}
.mt-0{margin-top:0}.mb-0{margin-bottom:0}
.stack>*+*{margin-top:14px}
hr.rule{border:0;border-top:1px solid var(--line);margin:0}
.on-ink hr.rule{border-color:var(--line-dk)}