/* Coletivo Concreto — sistema visual
   Baseado em human-output/dna/coletivo-concreto/resultado/DNA.md
   Paleta: grafite dominante + acento oliva único + bege-cimento no claro.
   Tipografia: Anton (display) + IBM Plex Sans (corpo) + IBM Plex Mono (técnico).
   Sem ícones, sem ilustração, sem cantos arredondados — só tipografia e imagem real. */

:root {
  --bg-dark: #161616;
  --bg-light: #EDEAE2;
  --accent: #4A4634;
  --accent-light: #6B6650;
  --accent-dark: #333120;
  --text-on-dark: #EDEAE2;
  --text-on-dark-60: rgba(237, 234, 226, 0.6);
  --text-on-light: #161616;
  --text-on-light-60: rgba(22, 22, 22, 0.6);
  --border: #3A3A3A;
  --surface: #202020;

  --font-display: 'Anton', 'Arial Narrow', sans-serif;
  --font-body: 'IBM Plex Sans', Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  --container: 1180px;
  --gutter: 24px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg-dark);
  color: var(--text-on-dark);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

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

/* Tipografia */

h1, h2, h3, .display {
  font-family: var(--font-display);
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 0.96;
  margin: 0;
  font-weight: 400;
}

.tag {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
}

.mono {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.02em;
}

p { margin: 0 0 16px; }
p:last-child { margin-bottom: 0; }

/* Cantos sempre retos — nunca arredondado, reforça a leitura industrial */
* { border-radius: 0 !important; }

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 84px;
}

.brand-mark {
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: 0;
  text-transform: uppercase;
  color: var(--text-on-dark);
}

.brand-mark span { color: var(--accent-light); }

.main-nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.main-nav a {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-on-dark-60);
  padding: 6px 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--text-on-dark);
  border-color: var(--accent);
}

.nav-cta {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background: var(--accent);
  color: var(--text-on-dark);
  padding: 10px 20px;
  border: 1px solid var(--accent);
  transition: background 0.15s, color 0.15s;
}

.nav-cta:hover { background: transparent; color: var(--accent-light); }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-on-dark);
  width: 44px;
  height: 44px;
  font-family: var(--font-mono);
  font-size: 12px;
}

/* Hero */

.hero {
  border-bottom: 1px solid var(--border);
  padding: 96px 0 88px;
}

.hero .tag { margin-bottom: 20px; display: block; }

.hero h1 {
  font-size: clamp(48px, 9vw, 112px);
  max-width: 14ch;
}

.hero .lede {
  font-size: 19px;
  color: var(--text-on-dark-60);
  max-width: 46ch;
  margin: 28px 0 36px;
}

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 15px 28px;
  border: 1px solid var(--accent);
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}

.btn-primary { background: var(--accent); color: var(--text-on-dark); }
.btn-primary:hover { background: transparent; color: var(--accent-light); }

.btn-outline { background: transparent; color: var(--text-on-dark); border-color: var(--border); }
.btn-outline:hover { border-color: var(--text-on-dark); }

/* Section base */

.section { padding: 88px 0; border-bottom: 1px solid var(--border); }
.section:last-of-type { border-bottom: none; }
.section.light { background: var(--bg-light); color: var(--text-on-light); }
.section.light .tag { color: var(--accent-dark); }

.section-head { margin-bottom: 56px; max-width: 62ch; }
.section-head h2 { font-size: clamp(32px, 5vw, 56px); margin-top: 12px; }
.section-head p { color: var(--text-on-dark-60); font-size: 17px; margin-top: 20px; }
.section.light .section-head p { color: var(--text-on-light-60); }

/* Grids de cards — retos, sem sombra, borda fina como separador */

.grid { display: grid; gap: 1px; background: var(--border); border: 1px solid var(--border); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--bg-dark);
  padding: 40px 32px;
}
.section.light .card { background: var(--bg-light); }

.card .mono { color: var(--accent-light); display: block; margin-bottom: 18px; }
.card h3 { font-size: 26px; margin-bottom: 14px; text-transform: none; letter-spacing: 0; line-height: 1.1; }
.card p { color: var(--text-on-dark-60); font-size: 15px; }
.section.light .card p { color: var(--text-on-light-60); }

/* Barra de assinatura técnica — inspirada na barra inferior de vídeo (3.8.12) */

.tech-bar {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  padding: 18px 0;
}
.tech-bar .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.tech-bar span { color: var(--text-on-dark-60); }
.tech-bar strong { color: var(--text-on-dark); font-weight: 500; }

/* Processo — linha numerada */

.process-list { border-top: 1px solid var(--border); }
.process-item {
  display: grid;
  grid-template-columns: 100px 1fr 2fr;
  gap: 32px;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
  align-items: baseline;
}
.process-item .num { font-family: var(--font-display); font-size: 40px; color: var(--accent-light); }
.process-item h3 { font-size: 22px; text-transform: none; letter-spacing: 0; }
.process-item p { color: var(--text-on-dark-60); font-size: 15px; max-width: 52ch; }

/* Portfólio */

.portfolio-item { background: var(--bg-dark); }
.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #000;
  border: 1px solid var(--border);
  overflow: hidden;
}
.video-frame iframe { width: 100%; height: 100%; border: 0; }
.portfolio-meta { padding: 20px 4px 0; display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.portfolio-meta .mono { color: var(--accent-light); }
.portfolio-meta h3 { font-size: 20px; text-transform: none; letter-spacing: 0; }

/* Formulário de contato */

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 24px; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--accent-light);
}
.field input,
.field select,
.field textarea {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text-on-dark);
  font-family: var(--font-body);
  font-size: 15px;
  padding: 14px 16px;
  width: 100%;
}
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent-light);
}
.field textarea { resize: vertical; min-height: 120px; }
.form-note { font-size: 13px; color: var(--text-on-dark-60); margin-top: 8px; }

/* Footer */

.site-footer { padding: 56px 0 40px; }
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 24px;
}
.site-footer .brand-mark { font-size: 18px; }
.footer-meta { text-align: right; color: var(--text-on-dark-60); font-size: 13px; }
.footer-meta .mono { color: var(--text-on-dark-60); margin-top: 6px; }

/* Utilitários */

.center { text-align: center; }
.mt-0 { margin-top: 0; }

@media (max-width: 880px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 84px;
    left: 0;
    right: 0;
    background: var(--bg-dark);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px var(--gutter) 24px;
  }
  .main-nav.is-open { display: flex; }
  .main-nav a { width: 100%; padding: 14px 0; border-bottom: 1px solid var(--border); }
  .main-nav .nav-cta { border: 1px solid var(--accent); margin-top: 12px; text-align: center; }
  .nav-toggle { display: block; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .process-item { grid-template-columns: 1fr; gap: 8px; }
  .form-grid { grid-template-columns: 1fr; }
  .site-footer .wrap { flex-direction: column; align-items: flex-start; }
  .footer-meta { text-align: left; }
}