/* =========================================================
   BSE Consulting Engineers — Stylesheet
   Brand: gold/mustard diagonal band, charcoal ink, technical
   contour-drawing texture — drawn from the firm's real
   capability statement collateral.
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Archivo:wght@500;600;700;800&family=Inter:wght@400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --ink: #1C1B18;
  --ink-soft: #4A473F;
  --gold: #C0923F;
  --gold-deep: #9C7530;
  --grey: #ADABAB;
  --grey-light: #D7D4D3;
  --paper: #F5F3EF;
  --paper-deep: #EAE6DE;
  --white: #FFFFFF;

  --font-display: 'Archivo', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max: 1180px;
  --radius: 3px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }

h1,h2,h3,h4{
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.14;
  margin: 0 0 .5em;
  letter-spacing: -0.01em;
}
h1{ font-size: clamp(2.2rem, 4.6vw, 3.7rem); }
h2{ font-size: clamp(1.6rem, 3vw, 2.3rem); }
h3{ font-size: 1.22rem; }
p{ margin: 0 0 1em; color: var(--ink-soft); }

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-deep);
  display: inline-flex;
  align-items: center;
  gap: .5em;
  margin-bottom: 1em;
}
.eyebrow::before{
  content:'';
  width: 22px; height: 2px;
  background: var(--gold-deep);
  display: inline-block;
}

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 32px;
}

@media (max-width: 640px){
  .wrap{ padding: 0 20px; }
  body{ font-size: 16px; }
}

/* ---------- signature: diagonal gold band ---------- */
.gold-band{
  height: 10px;
  width: 100%;
  background: var(--gold);
}
.gold-band.thick{ height: 16px; }

.diagonal-header{
  position: relative;
  background: var(--gold);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% 78%, 0 100%);
}

/* ---------- header / nav ---------- */
header.site{
  position: sticky; top:0; z-index: 50;
  background: rgba(245,243,239,0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--grey-light);
}
.nav-row{
  display:flex; align-items:center; justify-content:space-between;
  padding: 14px 0;
}
.logo{
  display:flex; align-items:center; gap:12px;
}
.logo img{ height: 44px; width:auto; border-radius: 2px; }
.logo .word{
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.05rem;
  color: var(--ink);
  line-height: 1.2;
}
.logo .word small{
  display:block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  font-weight: 500;
  margin-top: 2px;
}

nav.links{ display:flex; align-items:center; gap: 34px; }
nav.links a{
  font-size: 0.92rem; font-weight: 500;
  color: var(--ink-soft);
  position: relative;
  padding: 4px 0;
}
nav.links a:hover, nav.links a.active{ color: var(--ink); }
nav.links a.active::after{
  content:'';
  position:absolute; left:0; right:0; bottom:-6px;
  height:3px;
  background: var(--gold);
  border-radius: 2px;
}

.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family: var(--font-mono);
  font-size: 0.76rem; letter-spacing: 0.06em; text-transform: uppercase;
  padding: 12px 22px;
  border-radius: var(--radius);
  background: var(--ink);
  color: var(--paper);
  border: 1px solid var(--ink);
  cursor: pointer;
  transition: transform .15s ease, background .15s ease;
}
.btn:hover{ background: #000; transform: translateY(-1px); }
.btn.gold{ background: var(--gold); border-color: var(--gold); color: var(--ink); }
.btn.gold:hover{ background: var(--gold-deep); border-color: var(--gold-deep); }
.btn.ghost{
  background: transparent; color: var(--ink); border: 1px solid var(--ink);
}
.btn.ghost:hover{ background: var(--ink); color: var(--paper); }

.nav-toggle{ display:none; }

@media (max-width: 860px){
  nav.links{
    position: fixed; inset: 68px 0 0 0;
    background: var(--paper);
    flex-direction: column; justify-content: flex-start;
    padding: 40px 32px; gap: 26px;
    transform: translateX(100%);
    transition: transform .25s ease;
  }
  nav.links.open{ transform: translateX(0); }
  nav.links a{ font-size: 1.3rem; }
  .nav-toggle{
    display:flex; flex-direction:column; gap:5px;
    background:none; border:none; cursor:pointer; padding: 8px;
  }
  .nav-toggle span{ width: 24px; height: 2px; background: var(--ink); display:block; }
}

/* ---------- hero ---------- */
.hero{
  position: relative;
  color: var(--white);
  overflow: hidden;
  min-height: 520px;
  display:flex; align-items:flex-end;
}
.hero::before{
  content:'';
  position:absolute; inset:0;
  background-image: url('../images/brand/hero-cad.jpg');
  background-size: cover;
  background-position: center 30%;
  z-index: 0;
}
.hero::after{
  content:'';
  position:absolute; inset:0;
  background: linear-gradient(0deg, rgba(15,14,12,0.92) 5%, rgba(15,14,12,0.55) 55%, rgba(15,14,12,0.25) 100%);
  z-index: 1;
}
.hero .wrap{ position:relative; z-index:2; padding-top: 90px; padding-bottom: 56px; width:100%; }
.hero-grid{
  display:grid; grid-template-columns: 1.15fr 0.85fr; gap: 60px; align-items: end;
}
.hero h1{ margin-bottom: .4em; color: var(--white); }
.hero .lede{ font-size: 1.12rem; max-width: 46ch; color: #E4E1D9; }
.hero .eyebrow{ color: var(--gold); }
.hero .eyebrow::before{ background: var(--gold); }
.hero-stats{
  display:flex; flex-direction:column; gap: 20px;
  border-left: 1px solid rgba(255,255,255,0.25);
  padding-left: 28px;
}
.hero-stats .stat b{
  display:block; font-family: var(--font-display); font-size: 1.7rem; color: var(--gold);
}
.hero-stats .stat span{
  font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: .06em;
  text-transform: uppercase; color: #D8D4C9;
}
.hero-cta{ display:flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }

@media (max-width: 860px){
  .hero-grid{ grid-template-columns: 1fr; gap: 30px; }
  .hero-stats{ border-left:none; border-top: 1px solid rgba(255,255,255,0.25); padding-left:0; padding-top: 20px; flex-direction: row; flex-wrap: wrap; }
  .hero{ min-height: 460px; }
}

/* smaller hero variant for inner pages */
.hero.small{ min-height: 300px; }
.hero.small .wrap{ padding-top: 70px; padding-bottom: 40px; }

/* ---------- section basics ---------- */
section{ padding: 74px 0; }
section.tight{ padding: 50px 0; }
.section-head{ max-width: 640px; margin-bottom: 46px; }
.section-head.center{ margin-left:auto; margin-right:auto; text-align:center; }

.on-paper-deep{ background: var(--paper-deep); }
.on-ink{ background: var(--ink); color: var(--paper); }
.on-ink p{ color: #C9C4B7; }
.on-ink h2, .on-ink h3{ color: var(--paper); }
.on-ink .eyebrow{ color: var(--gold); }
.on-ink .eyebrow::before{ background: var(--gold); }

/* ---------- service cards ---------- */
.services-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 22px;
}

.gallery-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 34px;
}
.gallery-grid figure{ margin:0; }
.gallery-grid .g-photo{
  aspect-ratio: 4/3; border-radius: var(--radius); overflow:hidden;
  border: 1px solid var(--grey-light); background: var(--paper-deep);
}
.gallery-grid .g-photo img{ width:100%; height:100%; object-fit:cover; }
.gallery-grid figcaption{
  font-family: var(--font-mono); font-size:.7rem; color: var(--ink-soft);
  margin-top: 8px; letter-spacing: .02em;
}
@media (max-width: 860px){
  .gallery-grid{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px){
  .gallery-grid{ grid-template-columns: 1fr; }
}
.service-card{
  background: var(--white);
  border: 1px solid var(--grey-light);
  border-radius: var(--radius);
  overflow: hidden;
  display:flex; flex-direction:column;
  transition: transform .18s ease, box-shadow .18s ease;
}
.service-card:hover{ transform: translateY(-4px); box-shadow: 0 14px 30px -18px rgba(28,27,24,0.35); }
.service-card .band{ height: 8px; background: var(--gold); }
.service-card .body{ padding: 26px 24px 28px; flex:1; display:flex; flex-direction:column; }
.service-card .num{
  font-family: var(--font-mono); font-size: 0.72rem; color: var(--ink-soft);
  margin-bottom: 14px; letter-spacing: .06em;
}
.service-card h3{ margin-bottom: .5em; }
.service-card p{ font-size: 0.94rem; flex:1; }
.service-card ul{ margin: 10px 0 0; padding-left: 18px; font-size: .88rem; color: var(--ink-soft); }
.service-card ul li{ margin-bottom: 4px; }
.service-card .learn{
  margin-top: 18px; font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .06em; color: var(--gold-deep); font-weight:500;
}
.service-card .learn:hover{ color: var(--ink); }

@media (max-width: 980px){
  .services-grid{ grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px){
  .services-grid{ grid-template-columns: 1fr; }
}

/* ---------- codes strip ---------- */
.codes-strip{
  display:flex; gap: 12px; flex-wrap: wrap;
}
.code-chip{
  display:flex; align-items:center; gap:10px;
  padding: 9px 15px;
  border: 1px solid var(--grey-light);
  border-radius: 999px;
  font-family: var(--font-mono); font-size: 0.76rem;
  background: var(--white);
  color: var(--ink-soft);
}
.code-chip .dot{ width:8px; height:8px; border-radius:50%; background: var(--gold); }

/* ---------- two column ---------- */
.two-col{
  display:grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items:center;
}
@media (max-width: 860px){ .two-col{ grid-template-columns: 1fr; gap: 34px; } }

.photo-frame{
  aspect-ratio: 4/3;
  border-radius: var(--radius);
  background: var(--paper-deep);
  border: 1px solid var(--grey-light);
  display:flex; align-items:center; justify-content:center;
  position: relative;
  overflow: hidden;
}
.photo-frame .placeholder-label{
  font-family: var(--font-mono); font-size: 0.72rem; text-transform: uppercase;
  letter-spacing: .06em; color: var(--ink-soft); text-align:center; padding: 20px;
  border: 1px dashed var(--grey-light);
  border-radius: var(--radius);
  background: rgba(245,243,239,0.7);
}
.photo-frame img{ width:100%; height:100%; object-fit: cover; }

/* ---------- process / steps ---------- */
.steps{
  display:grid; grid-template-columns: repeat(4,1fr); gap: 0;
  border-top: 1px solid var(--grey-light);
  border-bottom: 1px solid var(--grey-light);
}
.step{
  padding: 30px 26px;
  border-right: 1px solid var(--grey-light);
}
.step:last-child{ border-right:none; }
.step .step-num{ font-family: var(--font-mono); font-size: .78rem; color: var(--gold-deep); margin-bottom: 10px; display:block; }
@media (max-width: 860px){
  .steps{ grid-template-columns: 1fr 1fr; }
  .step{ border-bottom: 1px solid var(--grey-light); }
}
@media (max-width: 560px){ .steps{ grid-template-columns: 1fr; } }

/* ---------- values grid (about page) ---------- */
.values-grid{
  display:grid; grid-template-columns: repeat(3, 1fr); gap: 26px;
}
@media (max-width: 860px){ .values-grid{ grid-template-columns: 1fr; } }
.value-item{ padding-left: 20px; border-left: 2px solid var(--gold); }

/* ---------- quote / callout ---------- */
.callout{
  border: 1px solid var(--grey-light);
  background: var(--white);
  border-radius: var(--radius);
  padding: 36px;
  display:flex; gap: 22px; align-items:flex-start;
}
.callout .mark-bar{
  width: 6px; align-self:stretch; border-radius: 4px; background: var(--gold); flex-shrink:0;
}

/* ---------- CTA band ---------- */
.cta-band{
  background: var(--ink);
  color: var(--paper);
  padding: 64px 0;
  text-align:center;
}
.cta-band h2{ color: var(--paper); }
.cta-band p{ color:#C9C4B7; max-width: 52ch; margin-left:auto; margin-right:auto; }
.cta-band .hero-cta{ justify-content:center; }

/* ---------- timeline (about) ---------- */
.timeline{
  display:flex; flex-direction:column; gap:0;
  border-left: 2px solid var(--gold);
  margin-left: 6px;
}
.timeline-item{
  padding: 0 0 34px 28px;
  position: relative;
}
.timeline-item::before{
  content:'';
  position:absolute; left:-7px; top:4px;
  width:12px; height:12px; border-radius:50%;
  background: var(--gold);
  border: 3px solid var(--paper);
}
.timeline-item:last-child{ padding-bottom:0; }
.timeline-item .t-year{ font-family: var(--font-mono); font-size:.75rem; color: var(--gold-deep); letter-spacing:.06em; }

/* ---------- projects page ---------- */
.filter-row{ display:flex; gap:10px; flex-wrap:wrap; margin-bottom: 40px; }
.filter-chip{
  font-family: var(--font-mono); font-size:.74rem; text-transform:uppercase; letter-spacing:.05em;
  padding: 9px 16px; border-radius: 999px; border: 1px solid var(--grey-light);
  background: var(--white); color: var(--ink-soft); cursor:pointer;
}
.filter-chip.active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }

.project-list{ display:flex; flex-direction:column; gap: 26px; }
.project-card{
  display:grid; grid-template-columns: 380px 1fr; gap: 0;
  border: 1px solid var(--grey-light);
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
}
.project-card .p-photo{ aspect-ratio: 4/3; overflow:hidden; background: var(--paper-deep); }
.project-card .p-photo img{ width:100%; height:100%; object-fit: cover; }
.project-card .p-body{ padding: 30px 32px; }
.project-card .p-tag{
  font-family: var(--font-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.08em;
  color: var(--gold-deep); margin-bottom: 8px; display:block;
}
.project-card h3{ margin-bottom: 2px; }
.project-card .p-client{
  font-family: var(--font-mono); font-size:.8rem; color: var(--ink-soft); margin-bottom: 16px; display:block;
}
.project-card .p-cols{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 16px; }
.project-card .p-col h4{
  font-family: var(--font-mono); font-size:.68rem; text-transform:uppercase; letter-spacing:.06em;
  color: var(--ink-soft); margin-bottom:8px; font-weight:600;
}
.project-card .p-col ul{ margin:0; padding-left:16px; font-size:.86rem; }
.project-card .p-col p{ font-size:.9rem; margin:0; }

@media (max-width: 860px){
  .project-card{ grid-template-columns: 1fr; }
  .project-card .p-cols{ grid-template-columns: 1fr; }
}

/* ---------- contact page ---------- */
.contact-grid{
  display:grid; grid-template-columns: 1fr 1fr; gap: 60px;
}
@media (max-width: 860px){ .contact-grid{ grid-template-columns: 1fr; } }

.info-list{ list-style:none; margin:0; padding:0; }
.info-list li{
  padding: 18px 0;
  border-bottom: 1px solid var(--grey-light);
  display:flex; flex-direction:column; gap:4px;
}
.info-list .label{
  font-family: var(--font-mono); font-size: .7rem; text-transform:uppercase;
  letter-spacing: .06em; color: var(--ink-soft);
}
.info-list .value{ font-size: 1.05rem; }
.info-list a.value:hover{ color: var(--gold-deep); }

form.contact-form{ display:flex; flex-direction:column; gap: 18px; }
.field{ display:flex; flex-direction:column; gap: 6px; }
.field label{
  font-family: var(--font-mono); font-size: .7rem; text-transform:uppercase;
  letter-spacing: .06em; color: var(--ink-soft);
}
.field input, .field select, .field textarea{
  font-family: var(--font-body); font-size: 1rem;
  padding: 12px 14px;
  border: 1px solid var(--grey-light);
  border-radius: var(--radius);
  background: var(--white);
  color: var(--ink);
}
.field textarea{ resize: vertical; min-height: 110px; }
.field input:focus, .field select:focus, .field textarea:focus{
  outline: 2px solid var(--gold); outline-offset: 1px;
}
.form-note{ font-size: .82rem; color: var(--ink-soft); }

/* ---------- footer ---------- */
footer.site{
  background: var(--ink);
  color: #C9C4B7;
  padding: 56px 0 30px;
}
.footer-grid{
  display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px;
}
.footer-grid h4{
  color: var(--paper); font-family: var(--font-mono); font-size: .72rem;
  text-transform: uppercase; letter-spacing: .08em; margin-bottom: 16px;
}
.footer-grid ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:10px; }
.footer-grid a{ color:#C9C4B7; font-size: .92rem; }
.footer-grid a:hover{ color: var(--gold); }
.footer-bottom{
  border-top: 1px solid #3A3831;
  padding-top: 22px;
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:10px;
  font-family: var(--font-mono); font-size: .72rem; letter-spacing:.03em; color:#8C8878;
}
@media (max-width: 760px){
  .footer-grid{ grid-template-columns: 1fr 1fr; }
}

/* ---------- utility ---------- */
.mt-0{ margin-top:0; }
.text-center{ text-align:center; }
.visually-hidden{
  position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap;
}

/* reduced motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  .service-card, .btn{ transition:none; }
}