/* ============================================================
   OJEDA & MACHADO — ENGENHARIA ESTRUTURAL
   Design tokens
   ============================================================ */
:root {
  --safira: #100577;
  --safira-600: #1B0DA0;
  --safira-100: #ECEAFB;
  --noturno: #0A1749;
  --noturno-700: #101F5C;
  --noturno-600: #16296e;
  --meianoite: #404040;
  --nevoa: #BFBDBA;
  --nevoa-200: #E4E3E1;
  --marfim: #F2F2F0;
  --white: #FFFFFF;

  --font: "Fira Sans", "Segoe UI", Arial, sans-serif;

  --container: 1220px;
  --gap: 1.5rem;
  --radius: 4px;
  --radius-lg: 10px;

  --shadow-sm: 0 2px 10px rgba(10, 23, 73, 0.07);
  --shadow-md: 0 10px 30px rgba(10, 23, 73, 0.12);
  --shadow-lg: 0 20px 50px rgba(10, 23, 73, 0.18);

  --ease: cubic-bezier(.22, .61, .36, 1);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Reset ---------- */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--meianoite);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--font); color: var(--noturno); font-weight: 800; }
p { margin: 0; }
button { font-family: var(--font); cursor: pointer; }
:focus-visible {
  outline: 3px solid var(--safira);
  outline-offset: 3px;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 1.75rem;
}

section { position: relative; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--safira);
  margin-bottom: 1rem;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--safira);
  display: inline-block;
}
.eyebrow.on-dark { color: #9C93E8; }
.eyebrow.on-dark::before { background: #9C93E8; }

.section-head { max-width: 680px; margin-bottom: 3rem; }
.section-head h2 { font-size: clamp(1.9rem, 3.2vw, 2.5rem); line-height: 1.18; }
.section-head p { margin-top: 1rem; font-size: 1.05rem; color: var(--meianoite); }
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .55rem;
  padding: .95rem 1.7rem;
  border-radius: 999px;
  font-weight: 700;
  font-size: .95rem;
  border: 1.5px solid transparent;
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease);
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn-primary { background: var(--safira); color: var(--white); }
.btn-primary:hover { background: var(--noturno); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline-dark { border-color: rgba(10,23,73,.25); color: var(--noturno); background: transparent; }
.btn-outline-dark:hover { border-color: var(--noturno); background: var(--noturno); color: var(--white); transform: translateY(-2px); }
.btn-outline-light { border-color: rgba(255,255,255,.4); color: var(--white); background: transparent; }
.btn-outline-light:hover { border-color: var(--white); background: rgba(255,255,255,.12); transform: translateY(-2px); }
.btn-block { width: 100%; }

/* ---------- Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255,255,255,.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(10,23,73,.08);
  transition: box-shadow .3s var(--ease);
}
.site-header.scrolled { box-shadow: var(--shadow-sm); }
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}
.nav-logo { display: flex; align-items: center; height: 40px; }
.nav-logo img { height: 100%; width: auto; }
.nav-collapse {
  display: flex;
  align-items: center;
  gap: 2.8rem;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 2.4rem;
}
.nav-links a {
  font-weight: 600;
  font-size: 1.08rem;
  color: var(--meianoite);
  position: relative;
  padding: .3rem 0;
}
.nav-links a::after {
  content: "";
  position: absolute; left: 0; bottom: -2px;
  width: 0; height: 2px; background: var(--safira);
  transition: width .25s var(--ease);
}
.nav-links a:hover { color: var(--noturno); }
.nav-links a:hover::after { width: 100%; }
.nav-links a.active { color: var(--safira); }
.nav-links a.active::after { width: 100%; }
.nav-actions { display: flex; align-items: center; gap: 1.5rem; }
.nav-toggle {
  display: none;
  width: 42px; height: 42px;
  border: none; background: transparent;
  flex-direction: column; justify-content: center; align-items: center; gap: 5px;
}
.nav-toggle span { width: 24px; height: 2.5px; background: var(--noturno); border-radius: 2px; transition: transform .25s var(--ease), opacity .25s var(--ease); }
.nav-toggle.open span:nth-child(1) { transform: translateY(7.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7.5px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  background: var(--noturno);
  overflow: hidden;
  padding: 6.5rem 0 5rem;
}
.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 2rem;
  align-items: center;
  min-height: 480px;
}
.hero h1 {
  color: var(--white);
  font-size: clamp(2.5rem, 4.6vw, 3.6rem);
  line-height: 1.14;
  font-weight: 800;
}
.hero h1 em { font-style: italic; color: #B7AEF0; font-weight: 800; }
.hero p.lead {
  color: var(--nevoa);
  font-size: 1.15rem;
  max-width: 540px;
  margin-top: 1.4rem;
  line-height: 1.65;
}
.hero-actions { display: flex; gap: 1rem; margin-top: 2.2rem; flex-wrap: wrap; }

.hero-visual { position: relative; height: 100%; min-height: 380px; }
.hero-model {
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  cursor: grab;
  touch-action: pan-y;
}
.hero-model:active { cursor: grabbing; }
.hero-model canvas { display: block; width: 100%; height: 100%; }
.hero-model .model-hint {
  position: absolute;
  left: 50%;
  bottom: 14px;
  transform: translateX(-50%);
  font-size: .78rem;
  color: var(--nevoa);
  opacity: .65;
  pointer-events: none;
  white-space: nowrap;
}
.hero-model .model-loading {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--nevoa);
  font-size: .9rem;
  opacity: .7;
  text-align: center;
  padding: 0 1rem;
}

.hero-parallelogram {
  position: absolute;
  z-index: 1;
}
.para {
  position: absolute;
  transform: skewX(-22deg);
}

/* ---------- Stat strip ---------- */
.stat-strip {
  background: var(--marfim);
  border-bottom: 1px solid var(--nevoa-200);
}
.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  padding: 2.6rem 0;
}
.stat { text-align: center; padding: 0 1rem; border-left: 1px solid var(--nevoa-200); }
.stat:first-child { border-left: none; }
.stat .num { font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800; color: var(--safira); }
.stat .label { font-size: .85rem; color: var(--meianoite); margin-top: .3rem; letter-spacing: .01em; }

/* ---------- Cards: Areas ---------- */
.areas-section { padding: 6.5rem 0; }
.areas-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}
.area-card {
  background: var(--marfim);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.area-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.area-card .img-wrap { height: 220px; overflow: hidden; }
.area-card .img-wrap img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.area-card:hover .img-wrap img { transform: scale(1.06); }
.area-card .body { padding: 1.6rem 1.7rem 1.9rem; border-top: 3px solid var(--safira); }
.area-card h3 { font-size: 1.2rem; margin-bottom: .5rem; }
.area-card p { font-size: .95rem; color: var(--meianoite); }

/* ---------- Mission band ---------- */
.mission-band {
  background: var(--noturno);
  color: var(--white);
  padding: 5.5rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.mission-band blockquote {
  margin: 0 auto;
  max-width: 780px;
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  font-style: italic;
  font-weight: 700;
  line-height: 1.3;
}
.mission-band .icon-mark { width: 46px; margin: 0 auto 1.6rem; opacity: .85; }

/* ---------- Portfolio preview / grid ---------- */
.portfolio-preview { padding: 6.5rem 0; background: var(--white); }
.preview-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.1rem;
}
.preview-grid .p-item { border-radius: var(--radius); overflow: hidden; aspect-ratio: 4/3; box-shadow: var(--shadow-sm); }
.preview-grid .p-item img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.preview-grid .p-item:hover img { transform: scale(1.08); }
.center-cta { text-align: center; margin-top: 3rem; }

/* ---------- CTA band ---------- */
.cta-band {
  background: var(--safira);
  padding: 4.5rem 0;
  text-align: center;
  color: var(--white);
}
.cta-band h2 { color: var(--white); font-size: clamp(1.7rem, 3vw, 2.3rem); }
.cta-band p { color: #DAD6F5; margin-top: .8rem; font-size: 1.05rem; }
.cta-actions { display: flex; gap: 1rem; justify-content: center; margin-top: 2rem; flex-wrap: wrap; }
.cta-band .btn-outline-light:hover { background: rgba(255,255,255,.18); }
.cta-band .btn-primary { background: var(--white); color: var(--safira); }
.cta-band .btn-primary:hover { background: var(--noturno); color: var(--white); }

/* ---------- Footer ---------- */
.site-footer { background: var(--noturno); color: var(--nevoa); padding: 4.5rem 0 0; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-logo img { height: 34px; margin-bottom: 1.1rem; }
.footer-grid p { font-size: .92rem; line-height: 1.7; color: var(--nevoa); max-width: 300px; }
.footer-col h4 { color: var(--white); font-size: .85rem; letter-spacing: .08em; text-transform: uppercase; margin-bottom: 1.2rem; }
.footer-col ul li { margin-bottom: .75rem; }
.footer-col ul li a { font-size: .92rem; color: var(--nevoa); transition: color .2s; }
.footer-col ul li a:hover { color: var(--white); }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1.6rem 0; font-size: .82rem; color: #7C86AC; flex-wrap: wrap; gap: .6rem;
}

/* ---------- Page hero (inner pages) ---------- */
.page-hero {
  background: var(--noturno);
  padding: 4.5rem 0 4rem;
  position: relative;
  overflow: hidden;
}
.page-hero h1 { color: var(--white); font-size: clamp(2.1rem, 4vw, 2.9rem); max-width: 720px; }
.page-hero p.lead { color: var(--nevoa); margin-top: 1rem; max-width: 600px; font-size: 1.05rem; }
.page-hero .icon-mark { position: absolute; right: -40px; top: 50%; transform: translateY(-50%); width: 340px; opacity: .08; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- Utility ---------- */
.text-center { text-align: center; }
.mt-lg { margin-top: 3rem; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 260px; margin-top: 2rem; }
  .areas-grid { grid-template-columns: 1fr; }
  .preview-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .stat-row { grid-template-columns: repeat(2, 1fr); row-gap: 1.8rem; }
  .stat:nth-child(3) { border-left: none; }
}

@media (max-width: 720px) {
  .nav-collapse { display: none; }
  .nav-toggle { display: flex; }
  .nav.open .nav-collapse {
    display: flex;
    position: absolute;
    top: 84px; left: 0; right: 0;
    background: var(--white);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem 1.75rem 2rem;
    gap: 1.4rem;
    box-shadow: var(--shadow-md);
  }
  .nav.open .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
    width: 100%;
  }
  .nav.open .nav-actions { width: 100%; }
  .nav.open .nav-actions .btn { width: 100%; }
  .footer-grid { grid-template-columns: 1fr; }
  .preview-grid { grid-template-columns: 1fr 1fr; }
}