/* ESOLUTION — Engenharia & Tecnologia
   Identidade: blueprint / spec-sheet de engenharia. Standalone. */

:root {
  --ink:      #0A0E14;
  --ink-2:    #141A22;
  --paper:    #FFFFFF;
  --paper-2:  #F4F6F8;
  --paper-3:  #ECEFF3;
  --line:     #E3E7EC;
  --line-2:   #D2D8DF;
  --text:     #0A0E14;
  --text-2:   #5B6470;
  --text-3:   #899099;
  --accent:   #0E6FA3;
  --accent-2: #0B587F;
  --accent-soft: #E5F1F7;

  --font: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;

  --container: 1180px;
  --gutter: clamp(1.25rem, 0.7rem + 2.6vw, 2.5rem);
  --sec-y: clamp(4rem, 2.8rem + 5.5vw, 7.5rem);
  --r: 3px;
}

* , *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce){ html{scroll-behavior:auto} *{animation-duration:.001ms!important;transition-duration:.001ms!important} }

body {
  font-family: var(--font);
  font-size: 1.0625rem; line-height: 1.6; color: var(--text);
  background: var(--paper); -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
::selection { background: var(--accent); color: #fff; }

h1,h2,h3,h4 { font-weight: 600; line-height: 1.08; letter-spacing: -0.02em; color: var(--ink); }

/* ---- layout ---- */
.wrap { width:100%; max-width: var(--container); margin-inline:auto; padding-inline: var(--gutter); }
.section { padding-block: var(--sec-y); }
.section--alt { background: var(--paper-2); }
.section--dark { background: var(--ink); color: #C7CDD6; }
.section--dark h2, .section--dark h3 { color: #fff; }

/* mono label */
.tag {
  font-family: var(--mono); font-size: .72rem; letter-spacing: .1em;
  text-transform: uppercase; color: var(--accent); font-weight: 600;
  display: inline-flex; align-items: center; gap: .6em;
}
.tag::before { content: ""; width: 1.6em; height: 1px; background: var(--accent); opacity: .6; }

.head { max-width: 60ch; }
.head h2 { font-size: clamp(1.8rem, 1.2rem + 2.4vw, 3rem); margin-top: .8rem; }
.head p { color: var(--text-2); font-size: 1.12rem; margin-top: 1rem; max-width: 54ch; }
.section--dark .head p { color: #A7AEB8; }

/* ---- buttons ---- */
.btn {
  display:inline-flex; align-items:center; gap:.6em;
  font-family: var(--mono); font-size: .82rem; font-weight: 600;
  letter-spacing: .02em; padding: .9em 1.4em; border-radius: var(--r);
  border: 1px solid transparent; transition: background .2s, color .2s, border-color .2s, transform .2s;
}
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.btn .ar { transition: transform .25s ease; }
.btn:hover .ar { transform: translateX(3px); }
.btn--primary { background: var(--accent); color:#fff; }
.btn--primary:hover { background: var(--accent-2); }
.btn--ghost { border-color: var(--line-2); color: var(--ink); }
.btn--ghost:hover { border-color: var(--ink); }
.section--dark .btn--ghost { color:#fff; border-color: rgba(255,255,255,.25); }
.section--dark .btn--ghost:hover { border-color:#fff; }

/* ---- nav ---- */
.nav { position: fixed; top:0; left:0; right:0; z-index:50; border-bottom:1px solid transparent; transition: background .3s, border-color .3s; }
.nav.scrolled { background: rgba(255,255,255,.9); backdrop-filter: blur(12px); border-bottom-color: var(--line); }
.nav__in { display:flex; align-items:center; justify-content:space-between; height:66px; }
.logo { font-family: var(--mono); font-weight:700; font-size:1.12rem; letter-spacing:-.02em; color: var(--ink); }
.logo b { color: var(--accent); font-weight:700; }
.nav__links { display:flex; gap:1.9rem; }
.nav__links a { font-family: var(--mono); font-size:.8rem; color: var(--text-2); letter-spacing:.02em; transition: color .2s; }
.nav__links a:hover { color: var(--ink); }
.nav__cta { display:inline-flex; }
.burger { display:none; background:none; border:0; padding:.4rem; }
.burger span { display:block; width:22px; height:2px; background: var(--ink); margin:4px 0; transition:.3s; }
.mobile { position:fixed; inset:66px 0 0 0; z-index:49; background: var(--ink); padding:2rem 0; }
.mobile[hidden]{ display:none; }
.mobile .wrap { display:flex; flex-direction:column; }
.mobile a { font-family: var(--mono); font-size:1.3rem; color:#fff; padding:.7rem 0; border-bottom:1px solid var(--ink-2); }
.mobile a:last-child{ color: var(--accent); border-bottom:0; }

/* ---- hero ---- */
.hero { position:relative; padding-top: clamp(7rem, 5rem + 8vw, 10rem); padding-bottom: clamp(3.5rem,2.5rem + 5vw,6rem); background: var(--paper); overflow:hidden; border-bottom:1px solid var(--line); }
.hero__grid { position:absolute; inset:0; z-index:0;
  background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 46px 46px; opacity:.6;
  mask-image: radial-gradient(ellipse 80% 80% at 20% 0%, #000 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 20% 0%, #000 40%, transparent 80%);
}
.hero__in { position:relative; z-index:1; display:grid; grid-template-columns: 1.15fr .85fr; gap: clamp(2rem,4vw,4rem); align-items:center; }
.hero__meta { font-family: var(--mono); font-size:.72rem; color: var(--text-3); letter-spacing:.08em; margin-bottom:1.4rem; display:flex; gap:1rem; flex-wrap:wrap; }
.hero__meta b { color: var(--accent); font-weight:600; }
.hero h1 { font-size: clamp(2.4rem, 1.5rem + 3.8vw, 4.4rem); letter-spacing:-.035em; }
.hero h1 .em { color: var(--accent); }
.hero__sub { font-size: 1.2rem; color: var(--text-2); max-width: 42ch; margin-top:1.5rem; line-height:1.55; }
.hero__cta { display:flex; flex-wrap:wrap; gap:.8rem; margin-top:2rem; }

/* system diagram */
.diagram { width:100%; height:auto; }
.diagram .node { fill: var(--paper); stroke: var(--line-2); }
.diagram .node-core { fill: var(--accent-soft); stroke: var(--accent); }
.diagram .edge { stroke: var(--line-2); stroke-width:1.4; fill:none; }
.diagram .edge-live { stroke: var(--accent); stroke-width:1.6; fill:none; stroke-dasharray: 4 4; animation: dash 1.4s linear infinite; }
.diagram text { font-family: var(--mono); font-size:9px; fill: var(--text-2); }
.diagram text.core { fill: var(--accent-2); font-weight:700; }
@keyframes dash { to { stroke-dashoffset: -16; } }
@media (prefers-reduced-motion: reduce){ .diagram .edge-live { animation:none; } }

/* ---- what we do ---- */
.about { display:grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2rem,4vw,4rem); }
.about__lead p { font-size: clamp(1.15rem,1rem + .7vw,1.5rem); line-height:1.5; letter-spacing:-.01em; }
.about__lead p + p { margin-top:1.2rem; color: var(--text-2); font-size:1.12rem; }

/* ---- services: spec sheet ---- */
.specs { margin-top: clamp(2.2rem,4vw,3.2rem); border:1px solid var(--line); border-radius: var(--r); overflow:hidden; }
.spec { display:grid; grid-template-columns: 84px 1fr; border-top:1px solid var(--line); background: var(--paper); transition: background .25s; }
.spec:first-child { border-top:0; }
.spec:hover { background: var(--paper-2); }
.spec__id { font-family: var(--mono); font-size:.78rem; color: var(--accent); padding: 1.5rem 0 0 1.3rem; letter-spacing:.05em; }
.spec__body { padding: 1.4rem 1.6rem 1.5rem 0; display:grid; grid-template-columns: 1fr 1.4fr; gap: 1.5rem; align-items:baseline; }
.spec__body h3 { font-size:1.14rem; letter-spacing:-.01em; }
.spec__body p { color: var(--text-2); font-size:.98rem; line-height:1.5; }

/* ---- capabilities ---- */
.caps { display:grid; grid-template-columns:.85fr 1.15fr; gap: clamp(2rem,4vw,4rem); align-items:center; }
.pills { display:flex; flex-wrap:wrap; gap:.6rem; }
.pill { font-family: var(--mono); font-size:.76rem; padding:.55em .9em; border:1px solid rgba(255,255,255,.16); border-radius: var(--r); color:#C7CDD6; transition: border-color .2s, color .2s; }
.pill:hover { border-color: var(--accent); color: var(--accent); }
.pill--k { border-color: var(--accent); color: var(--accent); }
.caps__note { font-family: var(--mono); font-size:.74rem; color:#7C838E; margin-top:1.4rem; }

/* ---- method ---- */
.steps { margin-top: clamp(2.2rem,4vw,3.2rem); display:grid; grid-template-columns: repeat(4,1fr); gap: 1px; background: var(--line); border:1px solid var(--line); border-radius: var(--r); overflow:hidden; }
.step { background: var(--paper); padding: 1.6rem 1.4rem 1.8rem; }
.step__n { font-family: var(--mono); font-size:.74rem; color: var(--accent); letter-spacing:.06em; }
.step h3 { font-size:1.1rem; margin:.9rem 0 .6rem; }
.step p { font-size:.95rem; color: var(--text-2); line-height:1.5; }

/* ---- principles ---- */
.princ { display:grid; grid-template-columns: repeat(3,1fr); gap: clamp(1.5rem,3vw,2.4rem); margin-top: clamp(2.2rem,4vw,3.2rem); }
.princ__item { padding-top:1.4rem; border-top:2px solid var(--accent); }
.princ__item h3 { font-size:1.14rem; margin-bottom:.6rem; }
.princ__item p { color: var(--text-2); font-size:.98rem; line-height:1.55; }

/* ---- cta ---- */
.cta { text-align:left; }
.cta__in { display:grid; grid-template-columns: 1.3fr .7fr; gap:2rem; align-items:end; }
.cta h2 { font-size: clamp(1.9rem,1.3rem + 2.4vw,3rem); }
.cta__act { display:flex; flex-wrap:wrap; gap:.8rem; }

/* ---- footer ---- */
.foot { background: var(--ink); color:#8A929C; padding-block: clamp(3rem,4vw,4.5rem) 2rem; }
.foot__top { display:flex; justify-content:space-between; flex-wrap:wrap; gap:2rem; padding-bottom:2.4rem; border-bottom:1px solid var(--ink-2); }
.foot__logo { font-family: var(--mono); font-weight:700; font-size:1.2rem; color:#fff; }
.foot__logo b { color: var(--accent); }
.foot__tag { margin-top:.8rem; max-width:32ch; font-size:.95rem; }
.foot__bar { display:flex; flex-wrap:wrap; justify-content:space-between; gap:.5rem 1.5rem; margin-top:1.6rem; font-family: var(--mono); font-size:.72rem; color:#6B727C; }
.foot__bar a { color:inherit; transition:color .2s; }
.foot__bar a:hover { color:#D3D8DF; }

/* ---- reveal ---- */
[data-rise]{ opacity:0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
[data-rise].in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){ [data-rise]{opacity:1;transform:none} }

/* ---- responsive ---- */
@media (max-width: 940px){
  .nav__links,.nav__cta{ display:none; }
  .burger{ display:block; }
  .hero__in{ grid-template-columns:1fr; }
  .hero__art{ order:-1; max-width:420px; }
  .about{ grid-template-columns:1fr; }
  .caps{ grid-template-columns:1fr; }
  .steps{ grid-template-columns: repeat(2,1fr); }
  .princ{ grid-template-columns:1fr; }
  .cta__in{ grid-template-columns:1fr; align-items:start; }
}
@media (max-width: 560px){
  .spec{ grid-template-columns: 60px 1fr; }
  .spec__id{ padding-left:1rem; }
  .spec__body{ grid-template-columns:1fr; gap:.5rem; padding-right:1.2rem; }
  .steps{ grid-template-columns:1fr; }
  .hero__cta .btn, .cta__act .btn{ flex:1; justify-content:center; }
}