/* =============================================================
   CERNE — Arquitetura & Interiores
   Design System: minimalismo suíço, paleta terrosa, Space Grotesk + Inter
   Mobile-first. Foco no público mobile.
   ============================================================= */

/* ---------- TOKENS ---------- */
:root {
  /* Base neutra */
  --osso:      #EEE7E1;
  --branco:    #FFFFFF;
  --tinta:     #1A1917;
  --cinza:     #8A857E;

  /* Secundária */
  --oliva:     #414534;
  --oliva-cl:  #565B44;
  --concreto:  #B8B0A6;

  /* Suporte / acento */
  --mauve:     #C9ABA4;
  --areia:     #D0C6A2;
  --linha:     #DCD4CC;

  /* Escala 8px */
  --s-1: 4px;  --s0: 8px;  --s1: 16px; --s2: 24px; --s3: 32px;
  --s4: 48px;  --s5: 64px; --s6: 96px; --s7: 128px;

  --radius: 2px;
  --radius-md: 4px;

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 260ms;

  --container: 1360px;
  --pad-x: 20px;

  --font-display: "Space Grotesk", "Inter", "Helvetica Neue", Arial, sans-serif;
  --font-body: "Inter", "Helvetica Neue", Arial, sans-serif;

  --header-h: 68px;
}

/* ---------- RESET ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--osso);
  color: var(--tinta);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: rgba(65,69,52,0.15); }
ul, ol { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; -webkit-tap-highlight-color: rgba(65,69,52,0.15); }
a, button, .btn, input, textarea, select { touch-action: manipulation; }

/* Âncoras não ficam escondidas sob o header fixo */
[id] { scroll-margin-top: calc(var(--header-h) + 16px); }

::selection { background: var(--oliva); color: var(--osso); }

:focus-visible {
  outline: 2px solid var(--oliva);
  outline-offset: 3px;
  border-radius: var(--radius);
}

/* ---------- LAYOUT ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.skip-link {
  position: absolute; left: 12px; top: -60px;
  background: var(--tinta); color: var(--osso);
  padding: 10px 16px; border-radius: var(--radius);
  z-index: 1000; transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- TIPOGRAFIA UTIL ---------- */
.overline {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cinza);
}
.overline--light { color: rgba(238,231,225,0.7); }

.section-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 6vw, 2.6rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
.hero__title, .cta-final__title, .card__name, .serv-item__title, .mobile-nav__list a { text-wrap: balance; }

.link-arrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-display);
  font-weight: 500;
  border-bottom: 1px solid currentColor;
  padding-bottom: 3px;
  transition: gap var(--dur) var(--ease), color var(--dur) var(--ease);
}
.link-arrow:hover { gap: 14px; color: var(--cinza); }

/* ---------- BOTÕES ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 14px 28px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              transform var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.btn--primary { background: var(--tinta); color: var(--osso); }
.btn--primary:hover { background: var(--oliva); }
.btn--primary:active { transform: translateY(1px); }

.btn--light { background: var(--osso); color: var(--tinta); }
.btn--light:hover { background: var(--branco); }

.btn--secondary {
  background: transparent; color: var(--tinta);
  border: 1px solid var(--tinta);
}
.btn--secondary:hover { background: var(--tinta); color: var(--osso); }

.btn--lg { min-height: 56px; padding: 18px 40px; font-size: 16px; }

/* =============================================================
   HEADER
   ============================================================= */
.site-header {
  position: fixed; inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  display: flex; align-items: center;
  background: var(--osso);
  color: var(--tinta);
  box-shadow: 0 1px 0 var(--linha);
  transition: box-shadow var(--dur) var(--ease);
}
.site-header.is-solid { box-shadow: 0 1px 6px rgba(20,19,17,0.06); }
.header__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s2);
}

.brand { display: flex; flex-direction: column; line-height: 1; }
.brand__mark {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.14em;
}
.brand__sub {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.75;
  margin-top: 3px;
}

.nav { display: none; }
.nav__list { display: flex; gap: var(--s3); }
.nav__list a {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 15px;
  position: relative;
  padding: 6px 0;
}
.nav__list a::after {
  content: ""; position: absolute; left: 0; bottom: 0;
  width: 0; height: 1px; background: currentColor;
  transition: width var(--dur) var(--ease);
}
.nav__list a:hover::after { width: 100%; }

.header__cta { display: none; }

/* Burger */
.burger {
  width: 44px; height: 44px;
  display: inline-flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 5px;
}
.burger span {
  width: 24px; height: 2px; background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
body.nav-open .burger span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .burger span:nth-child(2) { opacity: 0; }
body.nav-open .burger span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================================
   MOBILE NAV (overlay)
   ============================================================= */
.mobile-nav {
  position: fixed; inset: 0;
  z-index: 90;
  background: var(--oliva);
  color: var(--osso);
  padding: calc(var(--header-h) + 24px) var(--pad-x) 32px;
  display: flex; flex-direction: column;
  transform: translateY(-100%);
  transition: transform 420ms var(--ease);
  visibility: hidden;
  overscroll-behavior: contain;
  overflow-y: auto;
}
body.nav-open .mobile-nav { transform: translateY(0); visibility: visible; }

.mobile-nav__list { flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 4px; }
.mobile-nav__list a {
  display: flex; align-items: baseline; gap: 16px;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 11vw, 3rem);
  letter-spacing: -0.02em;
  padding: 8px 0;
  border-bottom: 1px solid rgba(238,231,225,0.14);
}
.mobile-nav__idx {
  font-size: 13px; letter-spacing: 0.1em;
  color: var(--areia); opacity: 0.8;
  align-self: flex-start; margin-top: 10px;
}
.mobile-nav__cta { width: 100%; margin-top: var(--s2); }
.mobile-nav__foot {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  margin-top: var(--s2);
  font-size: 14px;
  color: rgba(238,231,225,0.75);
}
.mobile-nav__foot a { border-bottom: 1px solid rgba(238,231,225,0.3); padding-bottom: 2px; }

/* =============================================================
   HERO
   ============================================================= */
.hero {
  position: relative;
  /* Mostra só ~80px da faixa verde abaixo (< 96px de padding da seção Sobre),
     então o texto da próxima seção nunca aparece na 1ª tela, em qualquer altura de monitor */
  min-height: calc(100svh - 80px);
  display: flex; align-items: flex-end;
  padding-top: var(--header-h);
  padding-bottom: var(--s4);
  overflow: hidden;
  color: var(--osso);
}
.hero__media { position: absolute; inset: 0; z-index: -2; background: var(--tinta); }
.hero__video {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  /* escurece e dessatura o vídeo diretamente */
  filter: brightness(0.5) contrast(1.08) saturate(0.85);
  opacity: 0;
  transition: opacity 1200ms linear;
  will-change: opacity;
}
.hero__video.is-active { opacity: 1; }
.hero__scrim {
  position: absolute; inset: 0; z-index: -1;
  background:
    /* vinheta: escurece as bordas */
    radial-gradient(120% 100% at 50% 30%, rgba(20,19,17,0) 40%, rgba(20,19,17,0.55) 100%),
    /* base reforçada para o título/subtítulo */
    linear-gradient(to top, rgba(20,19,17,0.95) 0%, rgba(20,19,17,0.65) 30%, rgba(20,19,17,0.4) 62%, rgba(20,19,17,0.35) 100%),
    /* leve tinta verde-oliva da marca + escurecimento uniforme */
    linear-gradient(rgba(65,69,52,0.18), rgba(65,69,52,0.18)),
    rgba(20,19,17,0.35);
}
/* Efeito de grão/textura sutil sobre o vídeo */
.hero__scrim::after {
  content: "";
  position: absolute; inset: 0;
  opacity: 0.5;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.hero__grid { width: 100%; display: grid; gap: var(--s4); }

.hero__overline {
  color: #F4EDDE;
  margin-bottom: var(--s2);
  text-shadow: 0 1px 12px rgba(20,19,17,0.55);
}
.hero__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(2.6rem, 11vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  text-shadow: 0 2px 24px rgba(20,19,17,0.4);
}
.hero__subtitle {
  margin-top: var(--s2);
  max-width: 46ch;
  font-size: clamp(1rem, 4.4vw, 1.18rem);
  color: #F1EAE3;
  text-shadow: 0 1px 14px rgba(20,19,17,0.5);
}
.hero__actions {
  margin-top: var(--s3);
  display: flex; flex-wrap: wrap; align-items: center; gap: var(--s2);
}
.hero__scroll {
  font-family: var(--font-display); font-size: 13px;
  letter-spacing: 0.06em; color: rgba(238,231,225,0.7);
}

/* Índice numerado de projetos */
.hero__index-label { color: var(--areia); margin-bottom: var(--s1); }
.proj-index { border-top: 1px solid rgba(238,231,225,0.2); }
.proj-index__item {
  border-bottom: 1px solid rgba(238,231,225,0.2);
  transition: padding-left var(--dur) var(--ease), background var(--dur) var(--ease);
}
.proj-index__item a {
  display: flex; align-items: baseline; gap: 16px;
  padding: 14px 0;
}
.proj-index__num {
  font-family: var(--font-display); font-weight: 500;
  font-size: 13px; letter-spacing: 0.08em;
  color: var(--areia); min-width: 26px;
}
.proj-index__name {
  font-family: var(--font-display);
  font-weight: 500; font-size: 1.15rem;
  letter-spacing: -0.01em;
  transition: opacity var(--dur) var(--ease);
}
.proj-index__item.is-active,
.proj-index__item:hover { padding-left: 12px; background: rgba(238,231,225,0.06); }
.proj-index__item.is-active .proj-index__name { opacity: 1; }
.proj-index__item:not(.is-active) .proj-index__name { opacity: 0.7; }

/* =============================================================
   SOBRE NÓS  (bloco verde-oliva)
   ============================================================= */
.sobre {
  background: var(--oliva);
  color: var(--osso);
  padding-block: var(--s6);
}
.sobre__grid { display: grid; gap: var(--s4); }
.sobre__head { display: flex; flex-direction: column; gap: var(--s1); }
.sobre__kicker { color: var(--osso); }
.sobre__lead {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.2rem, 5vw, 1.6rem);
  color: var(--areia);
  letter-spacing: -0.01em;
}
.sobre__body { display: flex; flex-direction: column; gap: var(--s2); max-width: 62ch; }
.sobre__body p { color: rgba(238,231,225,0.9); }
.sobre__body strong { color: var(--osso); font-weight: 600; }

.stats {
  margin-top: var(--s2);
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: var(--s1);
  border-top: 1px solid rgba(238,231,225,0.2);
  padding-top: var(--s3);
}
.stats__num {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(2rem, 9vw, 3rem);
  letter-spacing: -0.02em; line-height: 1;
}
.stats__label {
  font-size: 12.5px; color: var(--areia);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-top: 8px;
}

/* =============================================================
   DEPOIMENTOS
   ============================================================= */
.depo { padding-block: var(--s6); background: var(--osso); }
.depo__title { max-width: 18ch; margin-bottom: var(--s4); }
.depo__grid { display: grid; gap: var(--s2); }

.depo-card {
  background: var(--branco);
  border-radius: var(--radius-md);
  padding: var(--s3);
  display: flex; flex-direction: column; gap: var(--s2);
}
.depo-card--rosa { background: var(--mauve); }
.depo-card blockquote {
  font-size: 1.08rem; line-height: 1.55;
  color: var(--tinta);
}
.depo-card figcaption { font-size: 14px; color: var(--cinza); }
.depo-card figcaption span { color: var(--tinta); font-weight: 600; display: block; }
.depo-card--rosa figcaption { color: rgba(26,25,23,0.7); }

.depo__more { margin-top: var(--s3); }

/* =============================================================
   PORTFÓLIO
   ============================================================= */
.portfolio { padding-block: var(--s6); background: var(--branco); }
.portfolio__head { display: flex; flex-direction: column; gap: var(--s1); margin-bottom: var(--s4); }
.portfolio__lead { max-width: 52ch; color: var(--cinza); }

.filters {
  display: flex; flex-wrap: wrap; gap: 8px;
  margin-top: var(--s1);
}
.filters__btn {
  font-family: var(--font-display); font-weight: 500; font-size: 14px;
  padding: 9px 18px; min-height: 44px;
  border: 1px solid var(--linha);
  border-radius: 999px;
  color: var(--tinta);
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease);
}
.filters__btn:hover { border-color: var(--tinta); }
.filters__btn.is-active { background: var(--tinta); color: var(--osso); border-color: var(--tinta); }

.grid-projetos { display: grid; gap: var(--s3); }

.card { opacity: 1; transition: opacity var(--dur) var(--ease); }
.card.is-hidden { display: none; }
.card__media {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--concreto);
}
.card__media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 500ms var(--ease);
}
.card__link:hover .card__media img { transform: scale(1.04); }
.card__num {
  position: absolute; top: 12px; left: 12px;
  font-family: var(--font-display); font-weight: 500;
  font-size: 12px; letter-spacing: 0.08em;
  color: var(--osso);
  background: rgba(20,19,17,0.55);
  padding: 5px 9px; border-radius: var(--radius);
  backdrop-filter: blur(4px);
}
.card__tag { margin-top: var(--s1); color: var(--cinza); }
.card__name {
  font-family: var(--font-display); font-weight: 500;
  font-size: 1.35rem; letter-spacing: -0.01em;
  margin-top: 6px;
}
.card__meta { font-size: 14px; color: var(--cinza); margin-top: 2px; }

/* =============================================================
   SERVIÇOS
   ============================================================= */
.servicos { padding-block: var(--s6); background: var(--osso); }
.servicos__grid { display: grid; gap: var(--s4); }
.servicos__head { display: flex; flex-direction: column; gap: var(--s1); }
.servicos__lead { max-width: 44ch; color: var(--cinza); }

.serv-list { display: grid; gap: 0; }
.serv-item {
  display: flex; gap: var(--s2);
  padding-block: var(--s3);
  border-top: 1px solid var(--linha);
}
.serv-item:last-child { border-bottom: 1px solid var(--linha); }
.serv-item__num {
  font-family: var(--font-display); font-weight: 600;
  font-size: 1.1rem; color: var(--concreto);
  min-width: 40px;
}
.serv-item__title {
  font-family: var(--font-display); font-weight: 500;
  font-size: 1.35rem; letter-spacing: -0.01em;
  margin-bottom: 8px;
}
.serv-item p { color: var(--cinza); max-width: 60ch; }

/* =============================================================
   CTA FINAL  (bloco mauve)
   ============================================================= */
.cta-final { background: var(--mauve); padding-block: var(--s6); }
.cta-final__inner { display: flex; flex-direction: column; align-items: flex-start; gap: var(--s2); max-width: 40ch; }
.cta-final__title {
  font-family: var(--font-display); font-weight: 600;
  font-size: clamp(2rem, 8vw, 3.2rem);
  line-height: 1.05; letter-spacing: -0.02em;
}
.cta-final__text { color: rgba(26,25,23,0.78); }
.cta-final .btn { margin-top: var(--s1); }

/* =============================================================
   RODAPÉ
   ============================================================= */
.footer { background: var(--tinta); color: var(--osso); padding-block: var(--s5) var(--s3); }
.footer__grid { display: grid; gap: var(--s4); }
.footer__brand .brand__mark--footer { font-size: 32px; letter-spacing: 0.14em; }
.footer__tag { font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase; opacity: 0.6; margin-top: 6px; }
.footer__col { display: flex; flex-direction: column; gap: 10px; }
.footer__big {
  font-family: var(--font-display); font-weight: 500;
  font-size: clamp(1.05rem, 4.5vw, 1.3rem);
  letter-spacing: -0.01em; line-height: 1.3;
  color: var(--osso);
  transition: color var(--dur) var(--ease);
  word-break: break-word;
}
.footer__big:hover { color: var(--areia); }
.footer__addr { font-style: normal; color: rgba(238,231,225,0.8); line-height: 1.6; }
.footer__links { display: flex; flex-direction: column; gap: 8px; }
.footer__links a { color: rgba(238,231,225,0.85); transition: color var(--dur) var(--ease); }
.footer__links a:hover { color: var(--osso); }
.footer__social { display: flex; gap: 18px; margin-top: var(--s1); }
.footer__social a { border-bottom: 1px solid rgba(238,231,225,0.3); padding-bottom: 2px; }

.footer__bottom {
  margin-top: var(--s4);
  padding-top: var(--s2);
  border-top: 1px solid rgba(238,231,225,0.15);
  display: flex; flex-direction: column; gap: 6px;
  font-size: 13px; color: rgba(238,231,225,0.6);
}

/* =============================================================
   FLOATERS
   ============================================================= */
.fab {
  position: fixed; z-index: 80;
  width: 54px; height: 54px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px;
  box-shadow: 0 4px 16px rgba(20,19,17,0.22);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}
.fab:hover { transform: translateY(-3px); }
.fab--wpp {
  right: 18px; bottom: 18px;
  background: var(--osso); color: var(--tinta);
  border: 1px solid var(--linha);
}
.fab--wpp:hover { background: var(--branco); }
.fab--top {
  right: 18px; bottom: 82px;
  background: var(--osso); color: var(--tinta);
  border: 1px solid var(--linha);
}
.fab--top[hidden] { display: none; }

/* =============================================================
   RESPONSIVO
   ============================================================= */
@media (min-width: 700px) {
  :root { --pad-x: 40px; }

  .depo__grid { grid-template-columns: repeat(2, 1fr); }
  .depo-card:first-child { grid-column: 1 / -1; }
  .grid-projetos { grid-template-columns: repeat(2, 1fr); gap: var(--s3); }

  .hero { align-items: flex-end; }

  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1fr; }
}

@media (min-width: 1000px) {
  :root { --pad-x: 64px; --header-h: 80px; }

  .burger { display: none; }
  .nav { display: block; }
  .header__cta { display: inline-flex; }

  .sobre__grid { grid-template-columns: 0.85fr 1.15fr; gap: var(--s6); align-items: start; }
  .servicos__grid { grid-template-columns: 0.85fr 1.15fr; gap: var(--s6); align-items: start; }

  .grid-projetos { grid-template-columns: repeat(3, 1fr); }
  .depo__grid { grid-template-columns: repeat(3, 1fr); }
  .depo-card:first-child { grid-column: auto; }

  .hero__subtitle { font-size: 1.2rem; }
}

@media (min-width: 1000px) {
  /* header vira sólido também deixa nav com bom contraste — handled via JS class */
  .site-header.is-solid .nav__list a,
  .site-header.is-solid .brand { color: var(--tinta); }
}

/* =============================================================
   ACESSIBILIDADE / MOTION
   ============================================================= */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .hero__video { display: none; }
  .hero__media { background: var(--oliva); }
}

/* Reveal on scroll */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 700ms var(--ease), transform 700ms var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }