/* ============================================================
   MIBASA – Mineração Barreto S.A.
   Folha de estilos principal
   ------------------------------------------------------------
   COMO EDITAR CORES: mude só os valores aqui em cima, em
   :root. Todo o resto do site usa essas variáveis.
   ============================================================ */

:root{
  /* Paleta institucional (azul + cinza-pedra) */
  --navy-950:#0B1B2B;   /* fundo escuro / rodapé */
  --navy-900:#122A42;   /* header, blocos escuros */
  --navy-700:#1E4A6B;   /* azul principal da marca */
  --blue-600:#2E6F95;   /* azul de destaque / links / botões */
  --blue-400:#6FA0BE;   /* azul claro para detalhes sobre fundo escuro */

  --stone-100:#F5F3EE;  /* fundo claro principal (cor de calcário) */
  --stone-200:#EDE9E0;  /* fundo alternado das seções */
  --stone-300:#DDD6C8;  /* bordas, divisores */
  --stone-500:#A79C8A;  /* texto terciário / ícones */
  --stone-700:#665D4E;  /* texto secundário sobre fundo claro */

  --ochre-500:#B4823A;  /* acento quente (pó de pedra) – uso pontual */
  --ochre-600:#96692C;

  --ink:#16212C;        /* texto principal */
  --white:#FFFFFF;

  --font-display:"Fraunces", Georgia, serif;
  --font-body:"Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono:"IBM Plex Mono", "Courier New", monospace;

  --container:1180px;
  --radius:4px;
  --shadow-1:0 1px 2px rgba(11,27,43,.06), 0 4px 16px rgba(11,27,43,.06);
  --shadow-2:0 8px 30px rgba(11,27,43,.14);
}

/* ---------- Reset básico ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--stone-100);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;line-height:1.12;font-weight:600;}
p{margin:0 0 1em;}
button{font-family:inherit;}

:focus-visible{
  outline:3px solid var(--ochre-500);
  outline-offset:2px;
}

.container{
  max-width:var(--container);
  margin:0 auto;
  padding:0 24px;
}

.eyebrow{
  font-family:var(--font-mono);
  text-transform:uppercase;
  letter-spacing:.14em;
  font-size:.75rem;
  color:var(--blue-600);
  font-weight:600;
  display:inline-block;
  margin-bottom:.9em;
}
.eyebrow::before{content:"— ";}

section{padding:96px 0;}
@media (max-width:720px){ section{padding:64px 0;} }

.section-title{
  font-size:clamp(2rem,4vw,2.9rem);
  max-width:18ch;
}
.section-lede{
  max-width:56ch;
  color:var(--stone-700);
  font-size:1.08rem;
}
.alt-bg{background:var(--stone-200);}
.dark-bg{background:var(--navy-950);color:var(--stone-100);}
.dark-bg .section-lede{color:var(--blue-400);}
.dark-bg .eyebrow{color:var(--blue-400);}

/* ---------- Botões ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.5em;
  padding:.85em 1.5em;
  border-radius:var(--radius);
  font-weight:600;
  font-size:.95rem;
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .15s ease, background .2s ease, border-color .2s ease, color .2s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn-primary{background:var(--ochre-500);color:var(--white);}
.btn-primary:hover{background:var(--ochre-600);}
.btn-outline{border-color:currentColor;background:transparent;}
.btn-outline:hover{background:var(--navy-900);color:var(--white);border-color:var(--navy-900);}
.dark-bg .btn-outline:hover{background:var(--white);color:var(--navy-950);border-color:var(--white);}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:rgba(11,27,43,.94);
  backdrop-filter:blur(6px);
  color:var(--stone-100);
  border-bottom:1px solid rgba(255,255,255,.08);
}
.site-header .container{
  display:flex;
  align-items:center;
  justify-content:space-between;
  height:76px;
}
.brand{
  font-family:var(--font-display);
  font-size:1.4rem;
  font-weight:700;
  letter-spacing:.01em;
  display:flex;
  align-items:baseline;
  gap:.5em;
}
.brand small{
  font-family:var(--font-mono);
  font-size:.6rem;
  color:var(--blue-400);
  font-weight:500;
  letter-spacing:.08em;
  text-transform:uppercase;
}
.main-nav ul{display:flex;gap:2rem;}
.main-nav a{
  font-size:.92rem;
  font-weight:500;
  color:var(--stone-200);
  position:relative;
  padding:.3em 0;
}
.main-nav a::after{
  content:"";
  position:absolute;left:0;bottom:-2px;
  width:0;height:2px;background:var(--ochre-500);
  transition:width .2s ease;
}
.main-nav a:hover::after,
.main-nav a:focus-visible::after{width:100%;}

.header-actions{display:flex;align-items:center;gap:1rem;}
.nav-toggle{
  display:none;
  background:none;border:none;color:var(--stone-100);
  width:40px;height:40px;cursor:pointer;
  flex-direction:column;justify-content:center;align-items:center;gap:5px;
}
.nav-toggle span{width:22px;height:2px;background:currentColor;display:block;}

@media (max-width:900px){
  .main-nav{
    position:fixed;inset:76px 0 0 0;
    background:var(--navy-950);
    transform:translateX(100%);
    transition:transform .3s ease;
    padding:2rem 24px;
  }
  .main-nav.is-open{transform:translateX(0);}
  .main-nav ul{flex-direction:column;gap:1.4rem;}
  .main-nav a{font-size:1.15rem;}
  .nav-toggle{display:flex;}
  .header-actions .btn-outline{display:none;}
}

/* ============================================================
   HERO
   ============================================================ */
.hero{
  position:relative;
  background:linear-gradient(180deg,var(--navy-950) 0%, var(--navy-900) 60%, var(--navy-700) 100%);
  color:var(--white);
  overflow:hidden;
  padding:120px 0 0;
}
.hero .container{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:1.1fr .9fr;
  gap:3rem;
  align-items:center;
  padding-bottom:80px;
}
@media (max-width:900px){
  .hero .container{grid-template-columns:1fr;padding-bottom:40px;}
}
.hero h1{
  font-size:clamp(2.4rem,5vw,3.6rem);
  margin-bottom:.4em;
}
.hero h1 em{
  font-style:normal;
  color:var(--ochre-500);
}
.hero p.lede{
  font-size:1.15rem;
  color:var(--blue-400);
  max-width:46ch;
  margin-bottom:1.8em;
}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap;}

/* Estratos rochosos – elemento gráfico assinatura (representa as
   camadas geológicas da jazida de calcário dolomítico) */
.strata{
  position:relative;
  height:340px;
  border-radius:6px;
  overflow:hidden;
  box-shadow:var(--shadow-2);
}
.strata span{
  position:absolute;left:0;right:0;
  display:block;
}
.strata .l1{top:0;height:18%;background:#C9C2B6;}
.strata .l2{top:18%;height:14%;background:#9FB6C4;}
.strata .l3{top:32%;height:22%;background:#6FA0BE;}
.strata .l4{top:54%;height:16%;background:#3E7996;}
.strata .l5{top:70%;height:30%;background:#1E4A6B;}
.strata .grain{
  position:absolute;border-radius:50%;background:rgba(255,255,255,.35);
}
.strata .tag{
  position:absolute;right:16px;bottom:16px;
  background:rgba(11,27,43,.65);
  color:var(--stone-100);
  font-family:var(--font-mono);
  font-size:.72rem;
  padding:.5em .8em;
  border-radius:3px;
  letter-spacing:.04em;
}

/* faixa de estatísticas sob o hero */
.hero-stats{
  position:relative;z-index:2;
  border-top:1px solid rgba(255,255,255,.12);
  background:rgba(11,27,43,.5);
}
.hero-stats .container{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  padding:32px 24px;
  gap:1.5rem;
}
@media (max-width:800px){
  .hero-stats .container{grid-template-columns:repeat(2,1fr);}
}
.stat-num{
  font-family:var(--font-mono);
  font-size:1.7rem;
  color:var(--ochre-500);
  font-weight:600;
}
.stat-label{
  font-size:.8rem;
  color:var(--blue-400);
  text-transform:uppercase;
  letter-spacing:.06em;
}

/* ============================================================
   SOBRE / MOTTO
   ============================================================ */
.about-grid{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:4rem;
  align-items:start;
}
@media (max-width:860px){
  .about-grid{grid-template-columns:1fr;gap:2.5rem;}
}
.motto{
  border-left:3px solid var(--ochre-500);
  padding-left:1.2rem;
  font-family:var(--font-display);
  font-size:1.4rem;
  color:var(--navy-900);
  margin:1.6em 0;
}
.timeline{
  border-top:1px solid var(--stone-300);
  margin-top:1.5rem;
}
.timeline li{
  display:grid;
  grid-template-columns:90px 1fr;
  gap:1.2rem;
  padding:1.1rem 0;
  border-bottom:1px solid var(--stone-300);
}
.timeline time{
  font-family:var(--font-mono);
  color:var(--blue-600);
  font-weight:600;
}

/* ============================================================
   MINA BELO MONTE – estatísticas geológicas
   ============================================================ */
.mine-stats{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:1px;
  background:rgba(255,255,255,.1);
  border-radius:6px;
  overflow:hidden;
  margin-top:2.5rem;
}
@media (max-width:820px){ .mine-stats{grid-template-columns:repeat(2,1fr);} }
.mine-stat{
  background:var(--navy-900);
  padding:2rem 1.6rem;
}
.mine-stat .stat-num{font-size:2rem;}
.mine-stat .stat-label{color:var(--stone-300);}

/* ============================================================
   PRODUTOS
   ============================================================ */
.tabs{
  display:flex;
  gap:.5rem;
  margin-bottom:2.5rem;
  border-bottom:1px solid var(--stone-300);
}
.tab-btn{
  background:none;border:none;
  padding:.9em 1.4em;
  font-weight:600;
  font-size:1rem;
  color:var(--stone-700);
  cursor:pointer;
  position:relative;
  top:1px;
}
.tab-btn[aria-selected="true"]{
  color:var(--navy-900);
  border-bottom:2px solid var(--ochre-500);
}
.tab-panel{display:none;}
.tab-panel.is-active{display:block;}

.product-grid{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:1.6rem;
}
.product-card{
  background:var(--white);
  border:1px solid var(--stone-300);
  border-radius:var(--radius);
  padding:1.6rem;
  display:flex;
  flex-direction:column;
  gap:.9rem;
  transition:box-shadow .2s ease, transform .2s ease;
}
.product-card:hover{box-shadow:var(--shadow-1);transform:translateY(-3px);}
.product-card h3{font-size:1.15rem;color:var(--navy-900);}
.product-card p{color:var(--stone-700);font-size:.95rem;margin-bottom:0;}

/* régua de granulometria – elemento assinatura repetido nos cards
   de brita, com a escala real em milímetros de cada produto */
.grain-scale{
  --min:0; --max:80; /* escala fixa 0–80mm usada em todos os cards */
}
.grain-track{
  position:relative;
  height:8px;
  background:var(--stone-200);
  border-radius:4px;
  margin:.3rem 0 .2rem;
}
.grain-fill{
  position:absolute;top:0;bottom:0;left:0;
  background:linear-gradient(90deg,var(--blue-400),var(--blue-600));
  border-radius:4px;
}
.grain-caption{
  display:flex;justify-content:space-between;
  font-family:var(--font-mono);
  font-size:.72rem;
  color:var(--stone-500);
}
.grain-caption strong{color:var(--navy-900);}

/* ============================================================
   CLIENTES
   ============================================================ */
.clients-grid{
  display:flex;
  flex-wrap:wrap;
  gap:.7rem;
}
.client-chip{
  background:var(--white);
  border:1px solid var(--stone-300);
  border-radius:999px;
  padding:.55em 1.2em;
  font-size:.85rem;
  color:var(--stone-700);
  font-weight:500;
}

/* ============================================================
   GALERIA
   ============================================================ */
.gallery-grid{
  display:grid;
  grid-template-columns:repeat(auto-fill,minmax(220px,1fr));
  gap:12px;
}
.gallery-item{
  aspect-ratio:4/3;
  border-radius:var(--radius);
  background:
    repeating-linear-gradient(135deg,var(--stone-300) 0 10px,var(--stone-200) 10px 20px);
  display:flex;
  align-items:center;
  justify-content:center;
  color:var(--stone-500);
  font-family:var(--font-mono);
  font-size:.75rem;
  text-align:center;
  padding:1rem;
}

/* ============================================================
   CONTATO
   ============================================================ */
.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:3rem;
}
@media (max-width:860px){ .contact-grid{grid-template-columns:1fr;} }
.contact-list{margin-top:1.6rem;}
.contact-list li{
  display:flex;
  gap:1rem;
  padding:1rem 0;
  border-top:1px solid rgba(255,255,255,.12);
}
.contact-list li:last-child{border-bottom:1px solid rgba(255,255,255,.12);}
.contact-list .k{
  font-family:var(--font-mono);
  font-size:.72rem;
  text-transform:uppercase;
  letter-spacing:.06em;
  color:var(--blue-400);
  min-width:120px;
}
.map-frame{
  border:0;
  width:100%;
  height:100%;
  min-height:340px;
  border-radius:6px;
  filter:grayscale(.2) contrast(1.05);
}

/* ============================================================
   RODAPÉ
   ============================================================ */
.site-footer{
  background:var(--navy-950);
  color:var(--stone-500);
  padding:56px 0 28px;
  font-size:.9rem;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr;
  gap:2.5rem;
  padding-bottom:2rem;
  border-bottom:1px solid rgba(255,255,255,.08);
}
@media (max-width:760px){ .footer-grid{grid-template-columns:1fr;} }
.footer-grid h4{color:var(--stone-100);font-family:var(--font-body);font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:1em;}
.footer-grid a:hover{color:var(--white);}
.footer-bottom{
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;
  padding-top:1.6rem;
}

/* ---------- WhatsApp flutuante ---------- */
.whatsapp-float{
  position:fixed;
  right:20px;bottom:20px;
  z-index:200;
  background:#25D366;
  color:#fff;
  width:56px;height:56px;
  border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  box-shadow:var(--shadow-2);
  transition:transform .15s ease;
}
.whatsapp-float:hover{transform:scale(1.08);}

/* ---------- animações de entrada ---------- */
.reveal{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s ease, transform .6s ease;
}
.reveal.is-visible{opacity:1;transform:none;}