/* ==========================================================================
   MERIDIAN CIVIL ENGINEERING — design tokens
   Palette: blueprint drafting — deep blueprint navy, drafting-paper stone,
   steel-blue accent, safety-yellow call-to-action, charcoal ink.
   Type: Space Grotesk (display) / IBM Plex Sans (body) / IBM Plex Mono (data)
   ========================================================================== */

:root{
  --navy: #10233B;
  --stone: #EDECE6;
  --steel: #4A6FA5;
  --safety: #F5B700;
  --ink: #1B1F23;
  --concrete: #9CA3A8;
  --white: #FFFFFF;

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "IBM Plex Sans", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --max-width: 1180px;
  --radius: 2px;
}

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

html{ scroll-behavior: smooth; }

body{
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--stone);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

h1, h2, h3{
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.01em;
}

h2{ font-size: clamp(1.8rem, 3.4vw, 2.6rem); margin-bottom: 1rem; }
h3{ font-size: 1.15rem; margin-bottom: 0.5rem; }

.section-inner{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 6rem 2rem;
}

.eyebrow{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--steel);
  margin-bottom: 1rem;
}
.eyebrow.center{ text-align: center; }
.center{ text-align: center; margin-left: auto; margin-right: auto; }
.section-sub{ max-width: 46ch; color: var(--concrete); margin: -0.5rem auto 3rem; }

.tag-code{
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--steel);
  display: inline-block;
  margin-bottom: 0.4rem;
}

/* buttons */
.btn{
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  padding: 0.9rem 1.6rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  transition: transform 0.15s ease, background 0.2s ease, color 0.2s ease;
}
.btn-primary{
  background: var(--safety);
  color: var(--ink);
}
.btn-primary:hover{ transform: translateY(-2px); }
.btn-ghost{
  border-color: currentColor;
}
.btn-ghost:hover{ background: rgba(255,255,255,0.08); }

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header{
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  transition: background 0.25s ease, box-shadow 0.25s ease;
}
.site-header.scrolled{
  background: var(--stone);
  box-shadow: 0 1px 0 rgba(27,31,35,0.08);
}
.header-inner{
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo{ display: flex; align-items: center; gap: 0.5rem; }
.logo-mark{
  font-size: 1.4rem;
  color: var(--safety);
  transform: rotate(180deg);
  display: inline-block;
}
.logo-text{
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  color: var(--navy);
}
.logo-text.small{ font-size: 0.85rem; }
.logo-sub{
  display: block;
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.6rem;
  letter-spacing: 0.16em;
  color: var(--concrete);
}
.main-nav{ display: flex; align-items: center; gap: 2rem; }
.main-nav a{
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  color: var(--navy);
}
.nav-cta{
  background: var(--navy);
  color: var(--stone) !important;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
}
.nav-toggle{
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}
.nav-toggle span{
  width: 22px; height: 2px; background: var(--navy);
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero{
  position: relative;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  background: var(--navy);
  color: var(--stone);
  overflow: hidden;
  padding: 8rem 2rem 3rem;
}
.blueprint-grid{
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(74,111,165,0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74,111,165,0.18) 1px, transparent 1px);
  background-size: 44px 44px;
  opacity: 0;
  animation: grid-in 1.4s ease forwards 0.2s;
}
.blueprint-grid--dark{
  background-image:
    linear-gradient(rgba(237,236,230,0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(237,236,230,0.06) 1px, transparent 1px);
}
@keyframes grid-in{ to{ opacity: 1; } }

.hero-inner{
  position: relative;
  max-width: 780px;
  margin: 0 auto;
  text-align: center;
}
.hero-title{
  font-size: clamp(2.2rem, 6vw, 3.8rem);
  margin: 1rem 0 1.4rem;
}
.hero-lede{
  color: rgba(237,236,230,0.75);
  max-width: 56ch;
  margin: 0 auto 2.2rem;
  font-size: 1.05rem;
}
.hero-actions{ display: flex; gap: 1rem; justify-content: center; }
.hero .btn-ghost{ color: var(--stone); }

.dim-stats{
  position: relative;
  display: flex;
  justify-content: center;
  gap: 4rem;
  flex-wrap: wrap;
  margin-top: 4.5rem;
}
.dim-stat{
  display: flex;
  flex-direction: column;
  align-items: center;
  opacity: 0;
  transform: translateY(10px);
  animation: dim-in 0.6s ease forwards;
  animation-delay: var(--delay);
}
@keyframes dim-in{ to{ opacity: 1; transform: translateY(0); } }
.dim-line{ width: 100px; height: 20px; stroke: var(--steel); fill: var(--steel); margin-bottom: 0.5rem; }
.dim-line line{ stroke: var(--steel); stroke-width: 1.5; }
.dim-value{ font-family: var(--font-display); font-size: 1.6rem; font-weight: 700; }
.dim-label{ font-family: var(--font-mono); font-size: 0.65rem; letter-spacing: 0.1em; color: rgba(237,236,230,0.6); }

/* ==========================================================================
   ABOUT
   ========================================================================== */
.about-grid{
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 4rem;
  align-items: center;
}
.about-media{ position: relative; }
.about-media img{ border-radius: var(--radius); }
.about-tag{
  position: absolute;
  bottom: -1rem; left: -1rem;
  background: var(--navy);
  color: var(--stone);
  padding: 0.6rem 1rem;
  border-radius: var(--radius);
}
.credential-row{ margin-top: 2rem; display: flex; flex-direction: column; gap: 1rem; }
.credential{ display: flex; gap: 1rem; align-items: baseline; }
.credential-num{
  font-family: var(--font-mono);
  color: var(--steel);
  font-size: 0.85rem;
}

/* ==========================================================================
   SERVICES
   ========================================================================== */
.service-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--concrete);
  margin-top: 3rem;
}
.service-card{
  background: var(--stone);
  padding: 2.5rem 2rem;
  transition: background 0.2s ease;
}
.service-card:hover{ background: var(--white); }
.service-icon{ width: 40px; height: 40px; color: var(--steel); margin-bottom: 1.2rem; }
.service-card p{ color: var(--concrete); font-size: 0.95rem; }

/* ==========================================================================
   PROJECTS
   ========================================================================== */
.project-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
  margin-top: 3rem;
}
.project-media{ position: relative; overflow: hidden; border-radius: var(--radius); }
.project-media img{ transition: transform 0.4s ease; }
.project-card:hover .project-media img{ transform: scale(1.04); }
.project-dim{
  position: absolute;
  bottom: 1rem; right: 1rem;
  background: var(--navy);
  color: var(--stone);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius);
}
.project-info{ padding-top: 1.2rem; }
.project-info p{ color: var(--concrete); }

/* ==========================================================================
   VIDEO
   ========================================================================== */
.video-wrap{
  max-width: 900px;
  margin: 0 auto;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 20px 50px rgba(16,35,59,0.15);
}
.video-wrap video{ width: 100%; display: block; background: var(--navy); }

/* ==========================================================================
   GALLERY
   ========================================================================== */
.gallery-grid{
  columns: 3 220px;
  column-gap: 1rem;
  margin-top: 3rem;
}
.gallery-grid img{
  width: 100%;
  margin-bottom: 1rem;
  border-radius: var(--radius);
  cursor: zoom-in;
  transition: opacity 0.2s ease;
}
.gallery-grid img:hover{ opacity: 0.88; }

.lightbox{
  position: fixed; inset: 0;
  background: rgba(16,35,59,0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 3rem;
}
.lightbox.open{ display: flex; }
.lightbox img{ max-width: 100%; max-height: 85vh; border-radius: var(--radius); }
.lightbox-close{
  position: absolute; top: 1.5rem; right: 2rem;
  background: none; border: none; color: var(--stone);
  font-size: 2.2rem; cursor: pointer; line-height: 1;
}

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact{
  position: relative;
  background: var(--navy);
  color: var(--stone);
  overflow: hidden;
}
.contact-grid{
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
}
.contact-copy p{ color: rgba(237,236,230,0.75); margin-bottom: 1.5rem; }
.contact-details{ display: flex; flex-direction: column; gap: 1rem; margin-top: 1.5rem; }
.contact-details div{ display: flex; gap: 1rem; }
.contact-details .tag-code{ width: 70px; flex-shrink: 0; color: var(--safety); }

.contact-form{ display: flex; flex-direction: column; gap: 1.2rem; }
.contact-form label{
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  color: rgba(237,236,230,0.8);
}
.contact-form input,
.contact-form select,
.contact-form textarea{
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 0.8rem;
  background: rgba(237,236,230,0.06);
  border: 1px solid rgba(237,236,230,0.25);
  border-radius: var(--radius);
  color: var(--stone);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus{
  outline: 2px solid var(--safety);
  outline-offset: 2px;
}
.contact-form .btn{ align-self: flex-start; }
.form-note{ font-family: var(--font-mono); font-size: 0.8rem; color: var(--safety); }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer{ background: var(--ink); color: rgba(237,236,230,0.6); }
.footer-inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ==========================================================================
   SCROLL REVEAL
   ========================================================================== */
.reveal{ opacity: 0; transform: translateY(24px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in-view{ opacity: 1; transform: translateY(0); }

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 900px){
  .about-grid{ grid-template-columns: 1fr; }
  .contact-grid{ grid-template-columns: 1fr; }
  .service-grid{ grid-template-columns: repeat(2, 1fr); }
  .project-grid{ grid-template-columns: 1fr; }
}

@media (max-width: 700px){
  .main-nav{
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: var(--stone);
    flex-direction: column;
    align-items: flex-start;
    padding: 1.5rem 2rem;
    gap: 1.2rem;
    transform: translateY(-130%);
    transition: transform 0.25s ease;
    box-shadow: 0 8px 20px rgba(27,31,35,0.1);
  }
  .main-nav.open{ transform: translateY(0); }
  .nav-toggle{ display: flex; }
  .service-grid{ grid-template-columns: 1fr; }
  .gallery-grid{ columns: 2 160px; }
  .dim-stats{ gap: 2.5rem; }
}

/* Respect reduced motion */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  .blueprint-grid, .dim-stat, .reveal{ animation: none !important; opacity: 1 !important; transform: none !important; }
}