/* ============================================================================
   CHAVE MESTRE — Design System v3 · "Ateliê de Engenharia" (2026-07-04)
   Voz: engenharia sóbria e artesanal, brasileira, confiável. NÃO genérico.
   Princípios (awesome-design-md): cor reservada (1 acento = ouro), tipografia
   com personalidade (serifa Fraunces + mono IBM Plex), layout editorial,
   whitespace com intenção, hairlines no lugar de "card soup".
   ========================================================================== */
:root{
  --paper:   #EEF1F6;   /* claro corporativo (cool) */
  --paper-2: #E4E9F1;   /* banda alternada */
  --paper-3: #D9E0EA;
  --ink:     #0E1A30;   /* navy da marca (texto + escuro) */
  --ink-2:   #26344E;
  --ink-soft:#54607A;
  --ink-mute:#8A93A8;
  --line:    #D9E0EA;   /* hairline cool */
  --line-2:  #C1CAD9;

  /* luz sobre o escuro */
  --on-dark:      rgba(236,240,247,.72);
  --on-dark-soft: rgba(236,240,247,.55);
  --on-dark-line: rgba(236,240,247,.13);

  /* acentos: ouro (principal) + azul corporativo (jogo de cores) */
  --gold:    #B8891E;
  --gold-2:  #D8A93E;
  --gold-soft:rgba(184,137,30,.1);
  --blue:    #2563EB;
  --blue-lt: #6AA6FF;

  --dark:    #0E1A30;   /* seções/hero escuros (navy) */
  --dark-2:  #0A1424;

  --maxw:    1200px;
  --ease:    cubic-bezier(.2,.6,.2,1);
  --shadow:  0 24px 60px -30px rgba(8,16,32,.5);

  --serif:   'IBM Plex Sans','Inter',system-ui,sans-serif; /* display (nome mantido p/ compat) */
  --sans:    'IBM Plex Sans','Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --mono:    'IBM Plex Mono','JetBrains Mono',monospace;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
::selection{background:var(--gold);color:var(--paper)}
h1,h2,h3{font-family:var(--serif);font-weight:600;line-height:1.05;letter-spacing:-.015em;color:var(--ink);font-variation-settings:"opsz" 40}
h4{font-family:var(--sans);font-weight:700;letter-spacing:-.01em}

.container{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:28px}
@media(max-width:560px){.container{padding-inline:20px}}

/* ── Kicker (eyebrow técnico em mono) ────────────────────────── */
.kicker{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:.72rem;font-weight:500;text-transform:uppercase;letter-spacing:.22em;color:var(--gold)}
.kicker::before{content:"";width:22px;height:1px;background:var(--gold);opacity:.7}
.kicker.plain::before{display:none}
.kicker .idx{color:var(--ink-mute)}

/* jogo de cores nas palavras de chamada */
.g{color:var(--gold)}
.b{color:var(--blue)}
.hero .b,.sec.dark .b{color:var(--blue-lt)}
.hero .g,.sec.dark .g{color:var(--gold-2)}
/* palavra com traço dourado (assinatura) */
.mark{position:relative;white-space:nowrap}
.mark::after{content:"";position:absolute;left:0;right:0;bottom:.08em;height:.14em;background:var(--gold);opacity:.85;z-index:-1}

/* Reveal — progressive enhancement */
.reveal{transition:opacity .7s var(--ease),transform .7s var(--ease)}
html.js .reveal{opacity:0;transform:translateY(16px)}
html.js .reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.06s}.reveal[data-d="2"]{transition-delay:.12s}
.reveal[data-d="3"]{transition-delay:.18s}.reveal[data-d="4"]{transition-delay:.24s}
@media(prefers-reduced-motion:reduce){html.js .reveal{opacity:1;transform:none;transition:none}}

/* ── Botões (sóbrios; ouro é o acento reservado) ─────────────── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;font-family:var(--sans);font-weight:600;font-size:.92rem;padding:13px 24px;border-radius:2px;cursor:pointer;border:1px solid transparent;transition:transform .18s var(--ease),background .2s,color .2s,border-color .2s;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.btn-primary:hover{background:#000}
.btn-line{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-line:hover{border-color:var(--ink);background:transparent}
.btn-gold{background:var(--gold);color:var(--paper);border-color:var(--gold)}
.btn-gold:hover{background:var(--gold-2)}
.btn-sm{padding:10px 16px;font-size:.82rem}
.btn-lg{padding:15px 28px;font-size:.96rem}
/* link com seta que desliza */
.arrowlink{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.14em;color:var(--ink);font-weight:500}
.arrowlink i{color:var(--gold);transition:transform .2s}
.arrowlink:hover i{transform:translateX(5px)}

/* ── Nav ─────────────────────────────────────────────────────── */
.nav2{position:sticky;top:0;z-index:100;border-bottom:1px solid transparent;transition:background .3s,border-color .3s,backdrop-filter .3s}
.nav2.stuck{background:rgba(236,240,247,.86);backdrop-filter:blur(12px);border-bottom-color:var(--line)}
.nav2-in{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0}
.nav2-logo{display:flex;align-items:center;gap:12px}
.nav2-logo img{width:38px;height:38px}
.nav2-logo .nm{display:flex;flex-direction:column;line-height:1.02}
.nav2-logo .nm b{font-family:var(--sans);font-weight:800;font-size:.98rem;letter-spacing:.06em}
.nav2-logo .nm b span{color:var(--gold)}
.nav2-logo .nm small{font-family:var(--mono);font-size:.6rem;letter-spacing:.18em;text-transform:uppercase;color:var(--ink-mute)}
.nav2-links{display:flex;align-items:center;gap:2px}
.nav2-links a{padding:8px 13px;font-size:.88rem;font-weight:500;color:var(--ink-soft);position:relative;transition:color .2s}
.nav2-links a::after{content:"";position:absolute;left:13px;right:13px;bottom:2px;height:1px;background:var(--gold);transform:scaleX(0);transform-origin:left;transition:transform .25s var(--ease)}
.nav2-links a:hover,.nav2-links a.ativo{color:var(--ink)}
.nav2-links a:hover::after,.nav2-links a.ativo::after{transform:scaleX(1)}
.nav2-cta{display:flex;align-items:center;gap:10px}
.nav2-burger{display:none;width:42px;height:42px;border:1px solid var(--line-2);color:var(--ink);flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;background:transparent;border-radius:2px}
.nav2-burger span{width:19px;height:1.5px;background:currentColor}
.nav2-mobile{display:none;flex-direction:column;gap:2px;padding:6px 0 18px}
.nav2-mobile a{padding:12px 4px;color:var(--ink-soft);font-weight:500;border-bottom:1px solid var(--line)}
@media(max-width:940px){
  .nav2-links,.nav2-cta{display:none}
  .nav2-burger{display:flex}
  .nav2.open{background:var(--paper)}
  .nav2.open .nav2-mobile{display:flex}
}

/* ── Marquee (fina, discreta) ────────────────────────────────── */
.marquee{overflow:hidden;-webkit-mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent);mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:0;width:max-content;animation:scrollx 46s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.marquee-item{display:inline-flex;align-items:center;gap:10px;padding:0 34px;font-family:var(--mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.16em;color:var(--ink-soft);white-space:nowrap}
.marquee-item i{color:var(--gold);font-size:.7rem}
@keyframes scrollx{to{transform:translateX(-50%)}}

/* ── Seções ──────────────────────────────────────────────────── */
.sec{padding:70px 0}
.sec.soft{background:var(--paper-2)}
.sec.dark{background:var(--dark);color:var(--paper)}
.sec.dark h1,.sec.dark h2,.sec.dark h3{color:var(--paper)}
.rule{height:1px;background:var(--line);border:0}
.sec-head{max-width:720px;margin-bottom:38px}
.sec-head h2{font-size:clamp(2rem,4.2vw,3rem);margin:18px 0 0;font-variation-settings:"opsz" 90}
.sec-head p{color:var(--ink-soft);font-size:1.08rem;margin-top:16px;max-width:560px}

/* ── Rodapé ──────────────────────────────────────────────────── */
.foot2{background:var(--dark-2);color:rgba(236,240,247,.68);padding:64px 0 30px}
.foot2-grid{display:grid;grid-template-columns:1.7fr 1fr 1fr 1.3fr;gap:40px}
@media(max-width:820px){.foot2-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.foot2-grid{grid-template-columns:1fr}}
.foot2 .nav2-logo .nm b{color:var(--paper)}
.foot2 .nav2-logo .nm small{color:rgba(236,240,247,.5)}
.foot2 h4{font-family:var(--mono);font-size:.68rem;text-transform:uppercase;letter-spacing:.18em;color:rgba(236,240,247,.5);margin-bottom:16px;font-weight:500}
.foot2 ul{list-style:none;display:flex;flex-direction:column;gap:11px}
.foot2 a{color:rgba(236,240,247,.7);font-size:.92rem}
.foot2 a:hover{color:var(--gold-2)}
.foot2-base{display:flex;flex-wrap:wrap;gap:12px;justify-content:space-between;align-items:center;margin-top:44px;padding-top:22px;border-top:1px solid rgba(236,240,247,.12);color:rgba(236,240,247,.45);font-family:var(--mono);font-size:.74rem;letter-spacing:.04em}