/* ==========================================================================
   Green Tech Consultancy — Structural Engineering
   Design system: blueprint grid + technical title block
   ========================================================================== */

:root {
  --ink:        #14201C;
  --paper:      #F1F0EA;
  --paper-line: #D8D6CA;
  --green:      #1F4A38;
  --green-mid:  #3F7A56;
  --slate:      #6B7570;
  --brass:      #A9812E;
  --white:      #FFFFFF;

  --font-display: 'Poppins', sans-serif;
  --font-body:    'Work Sans', sans-serif;
  --font-mono:    'Poppins', sans-serif;

  --gutter: clamp(20px, 5vw, 64px);
  --nav-h: 76px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    radial-gradient(circle at top left, rgba(143, 175, 147, 0.28), transparent 60%),
    radial-gradient(circle at top right, rgba(169, 129, 46, 0.14), transparent 55%);
  background-size: 900px 900px, 900px 900px;
  background-repeat: no-repeat, no-repeat;
  background-position: top left, top right;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.08;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4.4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.4rem); }

p { margin: 0 0 1em; color: var(--ink); }

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--green-mid);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--brass);
  display: inline-block;
}

.wrap {
  max-width: 1180px;
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

/* ---------- Buttons ---------- */
.btn {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn:hover { background: var(--ink); color: var(--paper); }

.btn-primary {
  background: var(--green);
  border-color: var(--green);
  color: var(--white);
}
.btn-primary:hover { background: var(--ink); border-color: var(--ink); }

.btn-arrow::after { content: "\2192"; }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(241, 240, 234, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--paper-line);
}
.nav {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
  flex-shrink: 0;
}
.brand-mark { height: 38px; width: auto; flex-shrink: 0; display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1.15; white-space: nowrap; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}

.nav-links {
  display: flex;
  align-items: center;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.93rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.nav-links li { margin-left: 36px; }
.nav-links li:first-child { margin-left: 0; }
.nav-links a {
  text-decoration: none;
  color: var(--ink);
  position: relative;
  padding: 4px 0;
  white-space: nowrap;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; right: 100%;
  bottom: 0;
  height: 1px;
  background: var(--brass);
  transition: right 0.2s ease;
}
.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after { right: 0; }
.nav-links a[aria-current="page"] { color: var(--green); }

.nav-cta { font-size: 0.88rem; padding: 10px 16px; }

.nav-toggle { display: none; }
.hamburger {
  display: none;
  width: 26px; height: 20px;
  position: relative;
  cursor: pointer;
}
.hamburger span, .hamburger span::before, .hamburger span::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1px;
  background: var(--ink);
}
.hamburger span { top: 9px; }
.hamburger span::before { top: -8px; }
.hamburger span::after { top: 8px; }

/* ---------- Title block (signature element) ---------- */
.title-block {
  font-family: var(--font-mono);
  font-size: 0.81rem;
  letter-spacing: 0.03em;
  border: 1px solid var(--ink);
  color: var(--ink);
  width: 240px;
}
.title-block .tb-row {
  display: flex;
  justify-content: space-between;
  padding: 7px 10px;
  border-bottom: 1px solid var(--paper-line);
  gap: 12px;
}
.title-block .tb-row:last-child { border-bottom: none; }
.title-block .tb-key { color: var(--slate); text-transform: uppercase; }
.title-block .tb-val { color: var(--ink); text-align: right; }

/* ---------- Hero ---------- */
/* ---------- Photo hero banner ---------- */
.photo-hero {
  position: relative;
  height: 460px;
  background-image: linear-gradient(180deg, rgba(20,32,28,0.05) 0%, rgba(20,32,28,0.75) 100%), url('assets/hero-building.jpg');
  background-size: cover;
  background-position: center 42%;
  display: flex;
  align-items: flex-end;
}
.photo-hero-caption {
  padding: 0 var(--gutter) 44px;
  color: var(--white);
  max-width: 720px;
}
.photo-hero-caption .eyebrow { color: #B7D9BE; }
.photo-hero-caption .eyebrow::before { background: #C9A24A; }
.photo-hero-caption h2 {
  color: var(--white);
  margin: 0;
  font-size: clamp(1.9rem, 4vw, 3rem);
}

@media (max-width: 700px) {
  .photo-hero { height: 360px; }
}

.hero {
  position: relative;
  padding: 64px 0 80px;
  overflow: hidden;
  border-bottom: 1px solid var(--paper-line);
}
.grid-frame {
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.grid-frame .col-line {
  position: absolute;
  top: 0; bottom: 0;
  width: 1px;
  background: var(--paper-line);
}
.grid-frame .col-label {
  position: absolute;
  top: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--slate);
  transform: translateX(-50%);
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1.3fr auto;
  gap: 48px;
  align-items: start;
}
.hero-copy { max-width: 640px; }
.hero-copy p.lead {
  font-size: 1.1rem;
  color: var(--ink);
  max-width: 52ch;
}
.hero-actions {
  display: flex;
  gap: 16px;
  margin-top: 30px;
  flex-wrap: wrap;
}
.hero-block { justify-self: end; }

.coverage-strip {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--paper-line);
  display: flex;
  gap: 40px;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--slate);
}
.coverage-strip strong { color: var(--ink); }

/* ---------- Sections ---------- */
section { padding: 84px 0; }
.section-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 24px;
  margin-bottom: 44px;
  border-bottom: 1px solid var(--paper-line);
  padding-bottom: 24px;
}
.section-head h2 { margin: 0; }
.section-note { font-size: 0.95rem; color: var(--slate); max-width: 34ch; margin: 0; }

.alt { background: var(--ink); color: var(--paper); }
.alt p { color: #C9CFC9; }
.alt .eyebrow { color: #8FBF9E; }
.alt .section-head { border-bottom-color: #2A342F; }

/* ---------- Service cards ---------- */
.service-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}
.service-card {
  background: var(--paper);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.service-card-head {
  display: flex;
  align-items: baseline;
}
.service-index {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--brass);
  flex-shrink: 0;
  margin-right: 16px;
}
.service-card h3 { margin: 0; }
.service-card p { color: var(--slate); font-size: 0.95rem; margin: 0; }

/* ---------- Building types ---------- */
.type-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  border-top: 1px solid var(--paper-line);
  border-left: 1px solid var(--paper-line);
}
.type-cell {
  border-right: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
  padding: 26px 18px;
  font-family: var(--font-mono);
  font-size: 0.91rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--ink);
  display: flex;
  align-items: center;
  min-height: 88px;
}

/* ---------- Two column with title block ---------- */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
.split-media {
  border: 1px solid var(--paper-line);
  padding: 28px;
  background: var(--white);
}

/* ---------- Approach steps ---------- */
.steps { display: grid; gap: 0; border-top: 1px solid var(--paper-line); }
.step {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--paper-line);
}
.step-num { font-family: var(--font-mono); color: var(--brass); font-size: 0.98rem; }
.step h3 { margin-bottom: 6px; }
.step p { color: var(--slate); margin: 0; max-width: 60ch; }

/* ---------- Services detail page ---------- */
.service-detail {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 56px;
  padding: 60px 0;
  border-bottom: 1px solid var(--paper-line);
}
.service-detail:last-child { border-bottom: none; }
.service-detail-head { position: sticky; top: calc(var(--nav-h) + 24px); display: flex; align-items: baseline; }
.service-detail-head h2 { margin: 0; }
.service-detail-head .service-index { font-size: 0.98rem; flex-shrink: 0; margin-right: 16px; }
.service-detail-body ul {
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}
.service-detail-body li {
  padding-left: 22px;
  position: relative;
  color: var(--ink);
  font-size: 0.96rem;
}
.service-detail-body li::before {
  content: "";
  position: absolute;
  left: 0; top: 9px;
  width: 8px; height: 1px;
  background: var(--brass);
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
}
.contact-line {
  display: flex;
  justify-content: space-between;
  padding: 18px 0;
  border-bottom: 1px solid var(--paper-line);
  gap: 20px;
}
.contact-line .k {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
}
.contact-line .v { font-size: 1.05rem; text-decoration: none; }
.contact-line a.v:hover { color: var(--green-mid); }

form.enquiry { display: grid; gap: 18px; }
.field { display: grid; gap: 8px; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--slate);
}
.field input, .field textarea, .field select {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 12px 14px;
  border: 1px solid var(--ink);
  background: var(--white);
  color: var(--ink);
  border-radius: 0;
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus, .field textarea:focus, .field select:focus {
  outline: 2px solid var(--brass);
  outline-offset: 1px;
}
.form-note { font-size: 0.95rem; color: var(--slate); margin-top: -4px; }

/* ---------- CTA band ---------- */
.cta-band {
  padding: 70px 0;
  text-align: left;
  border-top: 1px solid var(--paper-line);
  border-bottom: 1px solid var(--paper-line);
}
.cta-band .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  flex-wrap: wrap;
}
.cta-band h2 { margin: 0; max-width: 14ch; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #C9CFC9;
  padding: 64px 0 28px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid #2A342F;
}
.footer-brand .brand-name { color: var(--white); }
.footer-brand .brand-sub { color: #8FBF9E; }
.footer-brand p { color: #A9AFA9; font-size: 0.9rem; margin-top: 14px; max-width: 32ch; }
.footer-col h4 {
  font-family: var(--font-mono);
  font-size: 0.83rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #8FBF9E;
  margin-bottom: 16px;
}
.footer-col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.footer-col a { text-decoration: none; color: #C9CFC9; font-size: 0.92rem; }
.footer-col a:hover { color: var(--white); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: #74807A;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Page intro (About / Services / Contact headers) ---------- */
.page-intro {
  padding: 56px 0 70px;
  border-bottom: 1px solid var(--paper-line);
  background-image: url('assets/skyline-bg.svg');
  background-repeat: no-repeat;
  background-position: bottom center;
  background-size: cover;
}
.page-intro .lead { font-size: 1.08rem; max-width: 60ch; color: var(--ink); }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-block { justify-self: start; }
  .service-list { grid-template-columns: 1fr; }
  .type-grid { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .service-detail { grid-template-columns: 1fr; gap: 20px; }
  .service-detail-head { position: static; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 700px) {
  .nav-links { display: none; }
  .hamburger { display: block; }
  .nav-toggle:checked ~ .nav-links {
    display: flex;
    position: absolute;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--paper-line);
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    padding: 8px var(--gutter) 20px;
  }
  .nav-toggle:checked ~ .nav-links li { margin-left: 0; width: 100%; }
  .nav-toggle:checked ~ .nav-links a {
    width: 100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--paper-line);
  }
  .nav-cta { display: none; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  section { padding: 56px 0; }
  .cta-band .wrap { flex-direction: column; align-items: flex-start; }
}