/* ==========================================================================
   SIL-VEX ENGINEERING — base.css
   Shared on every page: reset, design tokens, typography, nav, footer,
   buttons, and small reusable components (spec-rows, chips, cards).
   Page-specific layout lives in its own file (home.css, products.css, ...).
   ========================================================================== */

:root{
  /* ---- palette -------------------------------------------------------- */
  --ink:        #0F1D26;   /* headings / high-contrast text            */
  --steel:      #4A5A66;   /* body copy                                 */
  --steel-soft: #7C8B96;   /* muted copy, captions                      */
  --navy:       #0B3B5C;   /* primary brand blue                        */
  --navy-deep:  #062338;   /* darkest blue, footers, hero bg            */
  --red:        #C3311F;   /* brand red accent                          */
  --red-deep:   #8C2013;
  --silver:     #B9C2C9;   /* metallic dividers / strokes               */
  --line:       #D9DEE2;
  --bg:         #F3F5F6;
  --bg-alt:     #E9EDEF;
  --paper:      #FFFFFF;
  --shadow:     0 20px 45px -22px rgba(6,35,56,.35);

  /* ---- type ------------------------------------------------------------ */
  --font-display: 'Oswald', sans-serif;
  --font-body:    'IBM Plex Sans', sans-serif;
  --font-mono:    'IBM Plex Mono', monospace;

  /* ---- layout ------------------------------------------------------------ */
  --maxw: 1200px;
  --pad: clamp(20px, 5vw, 64px);
  --radius: 3px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: var(--font-body);
  color: var(--steel);
  background: var(--bg);
  -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{
  font-family: var(--font-display);
  color: var(--ink);
  text-transform: uppercase;
  letter-spacing: .02em;
  line-height: 1.12;
  margin: 0 0 .5em;
  font-weight: 600;
}
p{ margin:0 0 1em; }
.mono{ font-family: var(--font-mono); }

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

.wrap{
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--red);
}
.eyebrow::before{
  content:"";
  width: 22px; height: 1px;
  background: var(--red);
}

section{ padding: clamp(56px, 9vw, 108px) 0; }

.btn{
  display:inline-flex;
  align-items:center;
  gap:.6em;
  padding: .9em 1.6em;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor:pointer;
  transition: transform .18s ease, background .18s ease, color .18s ease, border-color .18s ease;
}
.btn:hover{ transform: translateY(-2px); }
.btn-primary{ background: var(--red); color:#fff; }
.btn-primary:hover{ background: var(--red-deep); }
.btn-outline{ border-color: rgba(255,255,255,.4); color:#fff; }
.btn-outline:hover{ background: rgba(255,255,255,.12); }
.btn-ghost{ border-color: var(--navy); color: var(--navy); }
.btn-ghost:hover{ background: var(--navy); color:#fff; }

/* ---------------------------------------------------------------- nav -- */
.site-header{
  position: sticky; top:0; z-index: 60;
  background: rgba(6,35,56,.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding-block: 14px;
}
.logo{ display:flex; align-items:center; gap:12px; }
.logo-mark{
  width: 34px; height:34px; position:relative; flex:none;
  background: linear-gradient(135deg, var(--red) 0 42%, var(--ink) 42% 100%);
  clip-path: polygon(30% 0, 100% 0, 70% 100%, 0 100%);
}
.logo-text{ line-height:1.1; }
.logo-text b{
  display:block; font-family: var(--font-display);
  color:#fff; letter-spacing:.03em; font-size:1.15rem;
}
.logo-text span{
  display:block; font-family: var(--font-mono); font-size:.58rem;
  letter-spacing:.32em; color: var(--silver);
}
.nav-links{ display:flex; align-items:center; gap: 34px; }
.nav-links a{
  font-family: var(--font-mono);
  font-size:.76rem; letter-spacing:.08em; text-transform:uppercase;
  color: rgba(255,255,255,.72);
  position:relative; padding-block:4px;
}
.nav-links a::after{
  content:""; position:absolute; left:0; right:100%; bottom:-2px; height:2px;
  background: var(--red); transition: right .2s ease;
}
.nav-links a:hover{ color:#fff; }
.nav-links a:hover::after,
.nav-links a.active::after{ right:0; }
.nav-links a.active{ color:#fff; }
.nav-cta{ display:flex; align-items:center; gap:18px; }
.nav-toggle{
  display:none; flex-direction:column; gap:5px; background:none; border:0; cursor:pointer; padding:6px;
}
.nav-toggle span{ width:22px; height:2px; background:#fff; }

@media (max-width: 900px){
  .nav-links{
    position:fixed; inset: 61px 0 auto 0; flex-direction:column; align-items:flex-start;
    background: var(--navy-deep); padding: 24px var(--pad) 32px;
    gap: 18px; transform: translateY(-8px); opacity:0; pointer-events:none;
    transition: opacity .2s ease, transform .2s ease;
    border-bottom: 1px solid rgba(255,255,255,.08);
  }
  .nav-links.open{ opacity:1; transform:none; pointer-events:auto; }
  .nav-toggle{ display:flex; }
  .nav-cta .btn-outline{ display:none; }
}

/* ------------------------------------------------------------ footer -- */
.site-footer{
  background: var(--navy-deep);
  color: rgba(255,255,255,.68);
  padding-block: 56px 28px;
}
.footer-grid{
  display:grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(255,255,255,.1);
}
.footer-grid h4{
  color:#fff; font-size:.85rem; letter-spacing:.14em; margin-bottom:1em;
}
.footer-grid p, .footer-grid li{ font-size:.9rem; }
.footer-grid a:hover{ color:#fff; }
.footer-grid li + li{ margin-top:.55em; }
.footer-bottom{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  padding-top: 22px; font-family: var(--font-mono); font-size:.72rem;
  letter-spacing:.04em; color: rgba(255,255,255,.4);
}
@media (max-width: 820px){
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 520px){
  .footer-grid{ grid-template-columns: 1fr; }
}

/* ------------------------------------------------------- spec / rows -- */
.spec-row{
  display:grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}
.spec-row:last-child{ border-bottom: 1px solid var(--line); }
.spec-row .spec-label{
  font-family: var(--font-mono);
  font-size:.72rem; letter-spacing:.14em; text-transform:uppercase;
  color: var(--red);
}
.spec-row h3{ font-size:1.15rem; margin-bottom:.3em; }
@media (max-width:640px){
  .spec-row{ grid-template-columns: 1fr; gap:8px; }
}

/* ------------------------------------------------------------- chips -- */
.chip{
  display:inline-block;
  padding:.35em .9em;
  border:1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size:.7rem;
  letter-spacing:.05em;
  color: var(--steel);
  background: var(--paper);
}

/* --------------------------------------------------------- reveal-on-scroll */
.reveal{
  opacity:0; transform: translateY(26px);
  transition: opacity .7s ease, transform .7s ease;
}
.reveal.is-visible{ opacity:1; transform:none; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .reveal{ opacity:1; transform:none; transition:none; }
}

/* ------------------------------------------------------ page banner --- */
.page-banner{
  background: var(--navy-deep);
  color:#fff;
  padding: 74px 0 54px;
  position:relative;
  overflow:hidden;
}
.page-banner::before{
  content:"";
  position:absolute; inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,.7), transparent);
}
.page-banner h1{ color:#fff; position:relative; font-size: clamp(2rem, 5vw, 3.2rem); }
.page-banner p{ position:relative; max-width:640px; color: rgba(255,255,255,.72); }

/* ------------------------------------------------------- cta banner --- */
.cta-banner{ background: var(--navy); color:#fff; }
.cta-inner{
  display:flex; align-items:center; justify-content:space-between; gap:30px; flex-wrap:wrap;
}
.cta-inner h2{ color:#fff; font-size: clamp(1.5rem, 3vw, 2.1rem); margin-bottom:.3em; max-width: 18ch; }
.cta-inner p{ color: rgba(255,255,255,.75); max-width: 46ch; margin:0; }