/* ===========================================================
   BTS ENGENHARIA E CONSTRUÇÕES — design tokens
   navy #071B32 / #0F2A4A     blue #0B6EA8     green #4CAF6E
=========================================================== */
:root{
  --navy-900: #071B32;
  --navy-800: #0F2A4A;
  --navy-700: #17395F;
  --blue-500: #0B6EA8;
  --blue-300: #6FB6DD;
  --green-500: #4CAF6E;
  --green-600: #3C9159;
  --steel-100: #EEF1F2;
  --steel-200: #E1E6E8;
  --ink: #0E1526;
  --ink-soft: #53606F;
  --white: #FFFFFF;

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 26px;

  --shadow-1: 0 1px 2px rgba(7,27,50,.06), 0 8px 24px -12px rgba(7,27,50,.18);
  --shadow-2: 0 20px 60px -20px rgba(7,27,50,.35);

  --ease: cubic-bezier(.16,.8,.24,1);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth; overflow-x:hidden; width:100%;}
@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;
  overflow-x:hidden;
  width:100%;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--steel-100);
  -webkit-font-smoothing:antialiased;
  line-height:1.55;
}

h1,h2,h3{
  font-family:var(--font-display);
  color:var(--navy-900);
  margin:0;
  line-height:1.1;
  letter-spacing:-.01em;
}
h2{font-size:clamp(1.7rem,3.2vw,2.5rem); font-weight:700}
h3{font-size:1.12rem; font-weight:600}
p{margin:0}
a{color:inherit; text-decoration:none}
img{max-width:100%; display:block}
ul,ol{margin:0; padding:0; list-style:none}
button{font:inherit; cursor:pointer; background:none; border:0; color:inherit}
input,select,textarea{font:inherit}

.wrap{ width:100%; max-width:1180px; margin:0 auto; padding:0 24px; }

.kicker{
  font-family:var(--font-display); font-weight:600; font-size:.8rem;
  color:var(--blue-500); margin:0 0 10px;
  display:flex; align-items:center; gap:8px;
}
.kicker::before{ content:""; width:16px; height:2px; background:var(--green-500); display:inline-block; }
.eyebrow{
  font-family:var(--font-display); font-weight:500; font-size:.85rem;
  color:var(--blue-300); margin:0 0 18px;
  display:inline-flex; align-items:center; gap:8px;
}
.eyebrow::before{ content:""; width:22px; height:1.5px; background:var(--blue-300); display:inline-block; }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:9px;
  font-family:var(--font-display); font-weight:600; font-size:.96rem;
  padding:14px 26px; border-radius:8px;
  transition:transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
  white-space:nowrap;
}
.btn-primary{
  background:var(--green-500); color:var(--navy-900);
  box-shadow:0 10px 30px -10px rgba(76,175,110,.55);
}
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 16px 36px -10px rgba(76,175,110,.65); background:#5DBE7E; }
.btn-ghost{
  background:rgba(255,255,255,.08); color:var(--white);
  border:1.5px solid rgba(255,255,255,.45); backdrop-filter:blur(6px);
}
.btn-ghost:hover{ background:rgba(255,255,255,.16); transform:translateY(-2px); }
.btn-outline{
  background:transparent; color:var(--navy-900);
  border:1.5px solid rgba(7,27,50,.25);
}
.btn-outline:hover{ background:var(--navy-900); color:var(--white); border-color:var(--navy-900); }
.btn-sm{ padding:10px 20px; font-size:.86rem; }
.btn-block{ width:100%; padding:16px; margin-top:6px; }

/* ===========================================================
   HEADER
=========================================================== */
.site-header{
  position:fixed; top:0; left:0; right:0; z-index:100;
  padding:18px 0;
  transition:padding .35s var(--ease), background .35s var(--ease), box-shadow .35s var(--ease);
}
.site-header.scrolled{
  padding:10px 0;
  background:rgba(7,27,50,.94);
  backdrop-filter:blur(10px);
  box-shadow:0 6px 24px -12px rgba(0,0,0,.4);
}
.header-inner{ display:flex; align-items:center; justify-content:space-between; gap:24px; }
.brand-mark{ height:38px; width:auto; transition:height .35s var(--ease); }
.site-header.scrolled .brand-mark{ height:32px; }

.main-nav{ display:flex; gap:30px; }
.main-nav a{
  font-family:var(--font-display); font-size:.92rem; font-weight:500;
  color:var(--white); opacity:.85; position:relative; padding:4px 0;
  transition:opacity .2s;
}
.main-nav a::after{
  content:""; position:absolute; left:0; right:100%; bottom:-2px; height:2px;
  background:var(--green-500); transition:right .3s var(--ease);
}
.main-nav a:hover{ opacity:1; }
.main-nav a:hover::after{ right:0; }

.header-actions{ display:flex; align-items:center; gap:16px; }
.header-ig{ color:var(--white); opacity:.85; display:flex; transition:opacity .2s, color .2s; }
.header-ig:hover{ opacity:1; color:var(--green-500); }
.header-phone{
  display:flex; align-items:center; gap:7px;
  font-family:var(--font-display); font-weight:600; font-size:.9rem;
  color:var(--white); opacity:.9;
}
.header-phone:hover{ opacity:1; color:var(--blue-300); }

.nav-toggle{ display:none; flex-direction:column; gap:5px; width:26px; }
.nav-toggle span{ height:2px; background:var(--white); border-radius:2px; transition:transform .3s var(--ease), opacity .3s; }
.nav-toggle.active span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
.nav-toggle.active span:nth-child(2){ opacity:0; }
.nav-toggle.active span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }

/* ===========================================================
   HERO
=========================================================== */
.hero{
  position:relative;
  min-height:100vh;
  display:flex; align-items:center;
  overflow:hidden;
  background:
    radial-gradient(ellipse at 85% 15%, rgba(11,110,168,.35), transparent 55%),
    linear-gradient(160deg, var(--navy-900) 0%, var(--navy-800) 100%);
  padding:150px 0 80px;
}
.hero-grid{
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:44px 44px;
  mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 85%);
  -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.9), transparent 85%);
}
.hero-blueprint{
  position:absolute; top:8%; right:4%;
  width:min(30vw,340px); height:min(30vw,340px);
  color:var(--blue-300); opacity:.14;
}
.hero-blueprint path{
  stroke-dasharray:220;
  stroke-dashoffset:220;
  animation:drawLine 2.6s var(--ease) .4s forwards;
}

@keyframes drawLine{ to{ stroke-dashoffset:0; } }

.hero-inner{
  position:relative; z-index:2;
  display:grid;
  grid-template-columns:1.15fr .85fr;
  gap:60px;
  align-items:center;
}

.hero-title{
  font-size:clamp(2.2rem,4.6vw,3.6rem);
  font-weight:700;
  color:var(--white);
}
.hero-title .line{ display:block; }
.hero-title .accent{ color:var(--green-500); }

.hero-sub{
  display:block; margin:24px 0 32px; max-width:50ch;
  font-size:1.05rem; color:rgba(255,255,255,.78);
}
.hero-cta{ display:flex; flex-wrap:wrap; gap:14px; }

.hero-stats{
  display:flex; flex-wrap:wrap; gap:32px;
  margin-top:48px; padding-top:26px;
  border-top:1px solid rgba(255,255,255,.14);
}
.hero-stats li{ display:flex; flex-direction:column; gap:4px; max-width:180px; }
.hero-stats strong{
  font-family:var(--font-display); font-size:1.05rem; font-weight:700; color:var(--green-500);
}
.hero-stats span{ font-size:.82rem; color:rgba(255,255,255,.64); }

.hero-figure{ position:relative; justify-self:center; }
.frame-corners{
  position:relative;
  padding:14px;
  border-radius:var(--radius-md);
}
.frame-corners::before, .frame-corners::after,
.frame-corners > span{ content:""; }
.frame-corners{
  --c: var(--green-500);
}
.frame-corners img{
  width:100%; max-width:340px; aspect-ratio:1/1; object-fit:cover;
  border-radius:14px;
  box-shadow:var(--shadow-2);
}
.frame-corners::before{
  position:absolute; top:0; left:0; width:34px; height:34px;
  border-top:3px solid var(--green-500); border-left:3px solid var(--green-500);
  border-radius:4px 0 0 0;
}
.frame-corners::after{
  position:absolute; bottom:0; right:0; width:34px; height:34px;
  border-bottom:3px solid var(--green-500); border-right:3px solid var(--green-500);
  border-radius:0 0 4px 0;
}
.hero-figure-tag{
  position:absolute; left:50%; bottom:-20px; transform:translateX(-50%);
  background:var(--white); color:var(--navy-900);
  padding:14px 22px; border-radius:12px; box-shadow:var(--shadow-2);
  display:flex; flex-direction:column; gap:2px; text-align:center;
  white-space:nowrap;
}
.hero-figure-tag strong{ font-family:var(--font-display); font-size:.9rem; }
.hero-figure-tag span{ font-size:.74rem; color:var(--ink-soft); }

.reveal{ opacity:0; transform:translateY(22px); animation:revealUp .8s var(--ease) forwards; }
.reveal[data-reveal="1"]{ animation-delay:.15s }
.reveal[data-reveal="2"]{ animation-delay:.3s }
.reveal[data-reveal="3"]{ animation-delay:.42s }
.reveal[data-reveal="4"]{ animation-delay:.55s }
.reveal[data-reveal="5"]{ animation-delay:.7s }
.reveal[data-reveal="6"]{ animation-delay:.85s }
@keyframes revealUp{ to{ opacity:1; transform:translateY(0); } }

/* ===========================================================
   TICKER
=========================================================== */
.ticker{ background:var(--green-500); overflow:hidden; padding:12px 0; position:relative; z-index:3; }
.ticker-track{
  display:flex; gap:14px; white-space:nowrap; width:max-content;
  animation:tickerMove 34s linear infinite;
  font-family:var(--font-display); font-weight:600; font-size:.86rem;
  color:var(--navy-900);
}
.ticker-track span:nth-child(even){ opacity:.55; }
@keyframes tickerMove{ from{ transform:translateX(0); } to{ transform:translateX(-50%); } }

/* ===========================================================
   SECTIONS (shared)
=========================================================== */
.section{ padding:104px 0; }
.section-alt{ background:var(--steel-200); }
.section-head{ max-width:620px; }
.section-head.center{ max-width:640px; margin:0 auto 60px; text-align:center; }
.section-lead{ margin-top:16px; font-size:1.02rem; color:var(--ink-soft); max-width:50ch; }
.section-lead.center-text{ margin-left:auto; margin-right:auto; }

.section-split{ display:grid; grid-template-columns:.85fr 1.15fr; gap:70px; align-items:start; }
.section-split.reverse{ grid-template-columns:1fr 1fr; }

.reveal-io{ opacity:0; transform:translateY(28px); transition:opacity .7s var(--ease), transform .7s var(--ease); }
.reveal-io.in{ opacity:1; transform:translateY(0); }

/* ---------- sobre ---------- */
.sobre-points{ display:flex; flex-direction:column; gap:0; }
.sobre-point{
  display:flex; gap:20px; align-items:flex-start;
  padding:26px 0; border-top:1px solid rgba(14,21,38,.1);
}
.sobre-point:last-child{ border-bottom:1px solid rgba(14,21,38,.1); }
.sobre-n{
  font-family:var(--font-display); font-weight:700; font-size:.85rem;
  color:var(--green-600); padding-top:3px; flex:none; width:28px;
}
.sobre-point h3{ margin-bottom:6px; }
.sobre-point p{ color:var(--ink-soft); font-size:.95rem; max-width:44ch; }

/* ---------- services ---------- */
.services-grid{
  display:grid; grid-template-columns:repeat(3,1fr); gap:2px;
  background:rgba(14,21,38,.1);
  border:1px solid rgba(14,21,38,.1);
  border-radius:var(--radius-md);
  overflow:hidden;
}
.services-grid li{
  background:var(--white);
  padding:34px 28px;
  transition:background .3s var(--ease);
}
.services-grid li:hover{ background:var(--steel-100); }
.service-icon{ width:34px; height:34px; color:var(--blue-500); margin-bottom:18px; }
.services-grid h3{ margin-bottom:8px; font-size:1.02rem; }
.services-grid p{ color:var(--ink-soft); font-size:.9rem; }

/* ===========================================================
   PORTFOLIO / CASE STUDIES
=========================================================== */
.case{
  display:grid; grid-template-columns:.8fr 1.2fr; gap:50px; align-items:center;
  padding:56px 0; border-top:1px solid rgba(14,21,38,.1);
}
.case:first-of-type{ border-top:none; }
.case.reverse{ grid-template-columns:1.2fr .8fr; }
.case.reverse .case-info{ order:2; }
.case.reverse .case-viewer{ order:1; }

.case-tag{
  display:inline-block; font-family:var(--font-display); font-weight:600; font-size:.76rem;
  color:var(--navy-900); background:var(--blue-300);
  padding:5px 14px; border-radius:999px; margin-bottom:14px;
}
.case-info h3{ font-size:1.5rem; margin-bottom:12px; }
.case-info p{ color:var(--ink-soft); font-size:.98rem; max-width:42ch; }

.case-viewer{
  background:var(--white); border-radius:var(--radius-md);
  box-shadow:var(--shadow-1); overflow:hidden;
}
.case-tabs{ display:flex; border-bottom:1px solid rgba(14,21,38,.1); }
.case-tabs button{
  flex:1; padding:14px 10px; font-family:var(--font-display); font-weight:600; font-size:.85rem;
  color:var(--ink-soft); position:relative; transition:color .2s;
}
.case-tabs button::after{
  content:""; position:absolute; left:12px; right:12px; bottom:0; height:2px;
  background:var(--green-500); transform:scaleX(0); transition:transform .3s var(--ease);
}
.case-tabs button.active{ color:var(--navy-900); }
.case-tabs button.active::after{ transform:scaleX(1); }

.case-frame{ position:relative; aspect-ratio:4/3; }
.case-frame img{
  position:absolute; inset:0; width:100%; height:100%; object-fit:cover;
  opacity:0; transition:opacity .5s var(--ease);
}
.case-frame img.active{ opacity:1; }

.portfolio-cta{
  margin-top:20px; padding-top:44px; border-top:1px solid rgba(14,21,38,.1);
  display:flex; align-items:center; justify-content:space-between; flex-wrap:wrap; gap:20px;
}
.portfolio-cta p{ font-family:var(--font-display); font-weight:600; color:var(--navy-900); }

/* ===========================================================
   ORÇAMENTO FORM
=========================================================== */
.orcamento-points{ margin-top:24px; display:flex; flex-direction:column; gap:12px; }
.orcamento-points li{ display:flex; align-items:center; gap:10px; font-size:.95rem; color:var(--ink-soft); }
.orcamento-points li::before{ content:""; width:7px; height:7px; border-radius:50%; background:var(--green-500); flex:none; }

.quote-form{
  background:var(--white); border-radius:var(--radius-lg);
  padding:40px; box-shadow:var(--shadow-2);
  display:grid; gap:20px;
}
.field{ position:relative; }
.field input, .field select, .field textarea{
  width:100%; border:1.5px solid rgba(14,21,38,.16); border-radius:var(--radius-sm);
  padding:18px 16px 8px; background:transparent; color:var(--ink);
  transition:border-color .2s, box-shadow .2s; resize:none;
}
.field select{
  appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9'%3E%3Cpath d='M1 1l6 6 6-6' stroke='%2353606F' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat; background-position:right 16px center; padding-right:36px;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none; border-color:var(--green-500); box-shadow:0 0 0 4px rgba(76,175,110,.14);
}
.field label{
  position:absolute; left:16px; top:16px; font-size:1rem; color:var(--ink-soft);
  pointer-events:none; transform-origin:left top;
  transition:transform .18s var(--ease), top .18s var(--ease), color .18s;
}
.field input:focus + label, .field input:not(:placeholder-shown) + label,
.field textarea:focus + label, .field textarea:not(:placeholder-shown) + label,
.field select:focus + label, .field select:valid + label{
  top:8px; transform:scale(.76); color:var(--green-600);
}
.field-textarea textarea{ padding-top:22px; }

.form-note{ font-size:.82rem; color:var(--ink-soft); text-align:center; }
.btn-loading{ display:none; }
.quote-form.sending .btn-label{ display:none; }
.quote-form.sending .btn-loading{ display:inline; }

/* ===========================================================
   FOOTER
=========================================================== */
.site-footer{ background:var(--navy-900); color:rgba(255,255,255,.72); padding:72px 0 0; }
.footer-grid{
  display:grid; grid-template-columns:1.3fr 1fr 1fr 1.2fr; gap:44px;
  padding-bottom:52px; border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-mark{ height:34px; margin-bottom:16px; }
.footer-brand p{ font-size:.88rem; max-width:32ch; }
.footer-col h4{ font-family:var(--font-display); color:var(--white); font-size:.9rem; margin-bottom:16px; }
.footer-col a{ display:block; font-size:.9rem; margin-bottom:10px; transition:color .2s; }
.footer-col a:hover{ color:var(--green-500); }
.footer-col p{ font-size:.88rem; line-height:1.7; }
.footer-map iframe{ width:100%; height:130px; border:0; border-radius:var(--radius-sm); filter:grayscale(.3) contrast(1.1); }

.footer-bottom{
  padding:22px 0 30px; font-size:.8rem; color:rgba(255,255,255,.45);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
}

/* ===========================================================
   WHATSAPP FLOAT
=========================================================== */
.wa-float{
  position:fixed; right:24px; bottom:24px; z-index:90;
  width:58px; height:58px; border-radius:50%;
  background:var(--green-500); color:var(--white);
  display:flex; align-items:center; justify-content:center;
  box-shadow:0 12px 28px -8px rgba(76,175,110,.6);
  animation:waPulse 2.6s ease-in-out infinite;
  transition:transform .25s var(--ease);
}
.wa-float:hover{ transform:scale(1.08); }
@keyframes waPulse{
  0%,100%{ box-shadow:0 12px 28px -8px rgba(76,175,110,.6), 0 0 0 0 rgba(76,175,110,.5); }
  50%{ box-shadow:0 12px 28px -8px rgba(76,175,110,.6), 0 0 0 12px rgba(76,175,110,0); }
}

/* ===========================================================
   RESPONSIVE
=========================================================== */
@media (max-width:980px){
  .hero-inner{ grid-template-columns:1fr; }
  .hero-figure{ order:-1; margin-bottom:20px; }
  .section-split, .section-split.reverse{ grid-template-columns:1fr; gap:44px; }
  .services-grid{ grid-template-columns:repeat(2,1fr); }
  .case, .case.reverse{ grid-template-columns:1fr; }
  .case-info, .case.reverse .case-info{ order:1; }
  .case-viewer, .case.reverse .case-viewer{ order:2; }
  .footer-grid{ grid-template-columns:1fr 1fr; }
}

@media (max-width:760px){
  .main-nav{ display:none; }
  .nav-toggle{ display:flex; }
  .header-phone{ display:none; }
  .hero{ padding:120px 0 64px; }
  .hero-stats{ gap:22px; }
  .hero-figure-tag{ white-space:normal; width:88%; }
  .section{ padding:72px 0; }
  .services-grid{ grid-template-columns:1fr; }
  .quote-form{ padding:26px; }
  .footer-grid{ grid-template-columns:1fr; gap:32px; }
  .portfolio-cta{ flex-direction:column; align-items:flex-start; }

  .main-nav.open{
    display:flex; flex-direction:column;
    position:fixed; top:70px; left:0; right:0;
    background:rgba(7,27,50,.98); backdrop-filter:blur(10px);
    padding:24px; gap:18px;
  }
}