/* ==========================================================================
   [TB] Schaw Building Limited — Construction Company Styles
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Sans:wght@400;500;600;700&family=Space+Mono:wght@400;700&display=swap');

/* --- Tokens --- */
:root {
  --c-navy: #1B2C50;
  --c-slate: #384753;
  --c-silver: #C7CBCB;
  --c-bg: #F5F5F5;
  --c-white: #FFFFFF;
  --c-text: #1B2C50;
  --c-text-muted: #384753;

  --ff-heading: 'Instrument Sans', 'Helvetica Neue', Arial, sans-serif;
  --ff-mono: 'Space Mono', 'Courier New', monospace;
  --ff-body: 'Instrument Sans', Arial, sans-serif;

  --fs-display-xl: clamp(64px, 10vw, 140px);
  --fs-display-lg: clamp(48px, 8vw, 100px);
  --fs-display-md: clamp(36px, 5vw, 64px);
  --fs-display-sm: clamp(24px, 3vw, 40px);
  --fs-body: 19px;
  --fs-body-sm: 15px;
  --fs-mono: 11px;
  --fs-nav: 15px;

  --lh-heading: 0.95;
  --lh-body: 1.65;
  --ls-heading: -0.03em;
  --ls-mono: 0.08em;

  --space-section: clamp(80px, 12vw, 160px);
  --space-container: clamp(24px, 4vw, 64px);
  --container-max: 1200px;
  --gap: 24px;
  --header-h: 80px;

  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur: 0.5s;
  --dur-slow: 0.9s;

  --c-surface: var(--c-white);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --border-radius: 0;
}

/* --- Reset --- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--ff-body);
  font-size: var(--fs-body);
  line-height: 1.5;
  color: var(--c-text);
  background: var(--c-bg);
  overflow-x: hidden;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button, input, textarea, select {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

/* --- Utility --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.mono-label {
  font-family: var(--ff-mono);
  font-size: var(--fs-mono);
  letter-spacing: var(--ls-mono);
  text-transform: uppercase;
  line-height: 1.4;
}
.section-padding {
  padding-top: var(--space-section);
  padding-bottom: var(--space-section);
}
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0, 0, 0, 0); border: 0;
}

/* --- Scroll Reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity var(--dur-slow) var(--ease-out), transform var(--dur-slow) var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--c-surface);
  box-shadow: var(--shadow-sm);
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: var(--header-h);
}

.nav-logo {
  font-family: var(--ff-heading);
  font-weight: bold;
  font-size: 1.5rem;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links li a {
  text-decoration: none;
  color: var(--c-text);
}

.nav-cta {
  background: var(--c-navy);
  color: var(--c-white);
  padding: 1rem;
  border-radius: var(--border-radius);
  text-decoration: none;
}

/* --- Hero --- */
.hero {
  min-height: 90vh;
  background: var(--c-navy);
  color: var(--c-white);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
}

.hero-headline {
  font-family: var(--ff-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: var(--lh-heading);
  margin-bottom: 1rem;
}

.hero-sub {
  opacity: 0.85;
  font-size: 1.1rem;
  margin-bottom: 2rem;
}

.btn-primary {
  background: var(--c-slate);
  color: var(--c-white);
  padding: 1rem;
  border-radius: 4px;
  text-decoration: none;
  display: inline-block;
}

/* --- Services --- */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--c-surface);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-sm);
  padding: 1.5rem;
}

/* --- Stats --- */
.stats-strip {
  background: var(--c-navy);
  color: var(--c-white);
  padding: 3rem 0;
  display: flex;
  justify-content: space-evenly;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
}

/* --- Section --- */
.section {
  padding: 5rem 0;
}

/* --- About --- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: 2rem;
}

/* --- Testimonials --- */
.testimonials {
  background: var(--c-bg);
  padding: 3rem 0;
}

/* --- Contact --- */
.contact-form {
  max-width: 600px;
  margin: auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.contact-form label {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.contact-form input,
.contact-form textarea,
.contact-form select {
  border: 1px solid var(--c-silver);
  padding: 0.75rem;
  border-radius: 4px;
  width: 100%;
}

/* --- Footer --- */
.site-footer {
  background: var(--c-navy);
  color: var(--c-white);
  padding: 3rem 0;
}

.site-footer .container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

/* --- Animations --- */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.active {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .site-footer .container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr;
  }

  .nav-links {
    display: none;
  }

  .nav-toggle {
    display: block; /* Or appropriate display value */
  }

  .site-footer .container {
    grid-template-columns: 1fr;
  }
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  z-index: 1001;
  padding: 8px;
}
.hamburger span {
  width: 28px; height: 2px;
  background: var(--c-navy);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease), background 0.3s var(--ease);
}
.site-header.scrolled .hamburger span { background: var(--c-navy); }
.hamburger.open span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }
.hamburger.open span { background: var(--c-white) !important; }

/* Mobile Nav Overlay */
.mobile-nav {
  position: fixed;
  inset: 0;
  background: var(--c-navy);
  z-index: 999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: 0 var(--space-container);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s var(--ease);
}
.mobile-nav.open { opacity: 1; pointer-events: auto; }
.mobile-nav a {
  font-family: var(--ff-heading);
  font-size: clamp(36px, 8vw, 56px);
  font-weight: 700;
  color: var(--c-white);
  letter-spacing: var(--ls-heading);
  line-height: 1.2;
  display: block;
  padding: 12px 0;
  transform: translateY(20px);
  opacity: 0;
  transition: transform 0.5s var(--ease-out), opacity 0.5s var(--ease-out), color 0.3s;
}
.mobile-nav.open a {
  transform: translateY(0);
  opacity: 1;
}
.mobile-nav.open a:nth-child(1) { transition-delay: 0.1s; }
.mobile-nav.open a:nth-child(2) { transition-delay: 0.15s; }
.mobile-nav.open a:nth-child(3) { transition-delay: 0.2s; }
.mobile-nav.open a:nth-child(4) { transition-delay: 0.25s; }
.mobile-nav.open a:nth-child(5) { transition-delay: 0.3s; }
.mobile-nav a:hover { color: var(--c-silver); }

@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
}