:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f4f1ec;
  --color-ink: #15151a;
  --color-muted: #64636c;
  --color-accent: #ff5a1f;
  --color-accent-2: #0b5fff;
  --color-bg-blue: #eaf1fc;
  --color-line: #e4e0d8;
  --font-display: 'Space Grotesk', sans-serif;
  --font-sans: 'Inter', sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-bg);
  line-height: 1.65;
  font-weight: 400;
}

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

a { color: inherit; text-decoration: none; }

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.eyebrow.center, h2.center { text-align: center; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-line);
  z-index: 100;
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.55rem;
  letter-spacing: -0.01em;
}

.logo span {
  display: block;
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.62rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--color-accent);
}

.main-nav {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-ink);
  position: relative;
  padding-bottom: 4px;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width 0.25s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--color-ink);
}

/* Hero */
.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 4rem 2rem;
  color: #fff;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 55% at 18% 88%, rgba(255,90,31,0.45), transparent 70%),
    linear-gradient(180deg, rgba(12,12,16,0.75), rgba(12,12,16,0.6) 45%, rgba(12,12,16,0.88));
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero .eyebrow { color: #ffb08a; }

.hero h1 {
  font-size: clamp(2.75rem, 6vw, 4.75rem);
  margin-bottom: 1rem;
}

.hero-sub {
  font-size: 1.15rem;
  font-weight: 300;
  color: #eceaea;
  margin-bottom: 2.25rem;
}

.btn {
  display: inline-block;
  padding: 0.9rem 2.25rem;
  border: 1px solid currentColor;
  border-radius: 2px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
  cursor: pointer;
  background: transparent;
  color: inherit;
  font-family: var(--font-sans);
}

.btn-accent {
  border-color: var(--color-accent);
  background: var(--color-accent);
  color: #fff;
}

.btn-accent:hover {
  background: transparent;
  color: var(--color-accent);
}

.hero .btn-accent:hover { color: #fff; border-color: #fff; background: rgba(255,255,255,0.12); }

/* Sections */
.section { padding: 7rem 2rem; }

.section.alt { background: var(--color-bg-alt); }

.section-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.section h2 {
  font-size: clamp(1.9rem, 3.5vw, 2.6rem);
  margin-bottom: 1.25rem;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.col-text p { color: var(--color-muted); margin-bottom: 1rem; max-width: 48ch; }

.feature-image {
  position: relative;
  aspect-ratio: 4/5;
  overflow: hidden;
  border-radius: 4px;
}

.feature-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.facts {
  display: flex;
  gap: 2.5rem;
  margin-top: 2rem;
  list-style: none;
}

.facts li {
  display: flex;
  flex-direction: column;
}

.facts strong {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--color-accent);
}

.facts span {
  font-size: 0.8rem;
  color: var(--color-muted);
  letter-spacing: 0.02em;
}

/* Projects */
.project-grid {
  margin-top: 3rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.project-card h3 {
  margin-top: 0.35rem;
  font-size: 1.25rem;
}

.project-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-top: 0.25rem;
}

.project-image {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  border-radius: 4px;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-image img { transform: scale(1.06); }

.project-category {
  margin-top: 1.1rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
}

/* BIM section */
.bim-section {
  background: var(--color-bg-blue);
  color: var(--color-ink);
}

.bim-intro {
  max-width: 68ch;
  margin: 0 auto 3rem;
  text-align: center;
  color: var(--color-muted);
  font-size: 1.05rem;
}

.bim-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
}

.bim-card {
  padding: 2rem 1.5rem;
  border: 1px solid var(--color-line);
  border-radius: 4px;
  background: #fff;
  transition: border-color 0.25s ease;
}

.bim-card:hover {
  border-color: var(--color-accent-2);
}

.bim-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-accent-2);
  margin-bottom: 0.85rem;
}

.bim-card h3 {
  font-size: 1.1rem;
  margin-bottom: 0.6rem;
}

.bim-card p {
  color: var(--color-muted);
  font-size: 0.9rem;
}

/* Contact */
.contact-list {
  list-style: none;
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.contact-list li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.contact-list strong {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: var(--color-accent);
}

.contact-list a, .contact-list span { color: var(--color-ink); }

#contactForm {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

#contactForm label {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
}

#contactForm input,
#contactForm textarea {
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-line);
  border-radius: 2px;
  background: #fff;
  color: var(--color-ink);
  resize: vertical;
}

#contactForm input:focus,
#contactForm textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

#contactForm .btn-accent {
  align-self: flex-start;
}

.form-status {
  font-size: 0.85rem;
  color: var(--color-accent);
  min-height: 1.2em;
}

/* Footer */
.site-footer {
  text-align: center;
  padding: 2.5rem 2rem;
  border-top: 1px solid var(--color-line);
  font-size: 0.8rem;
  color: var(--color-muted);
}

/* Responsive */
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: repeat(2, 1fr); }
  .bim-grid { grid-template-columns: repeat(2, 1fr); }
  .col-image { order: -1; }
}

@media (max-width: 640px) {
  .nav-toggle { display: flex; }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    gap: 0;
    border-bottom: 1px solid var(--color-line);
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  .main-nav.open { max-height: 300px; }
  .nav-link {
    padding: 1rem 2rem;
    border-top: 1px solid var(--color-line);
  }
  .project-grid { grid-template-columns: 1fr; }
  .bim-grid { grid-template-columns: 1fr; }
  .facts { gap: 1.5rem; }
}