/* ============================================
   BIMATRIX — styles.css
   Color Variables (DO NOT MODIFY)
   ============================================ */
:root {
  --bim: #1d2846;
  --atrix: #cccccc;
  --warm: #bfb3a0;
  --muted: #706768;
  --white: #ffffff;
  --off-white: #fafafa;
  --light-bg: #f7f5f2;
  --dark-bg: #1a1a1a;

  --font-main: 'Avenir Next Heavy', 'Avenir Next', sans-serif;
  --font-display: 'Avenir Next Heavy', 'Avenir Next', sans-serif;

  --radius: 2px;
  --radius-lg: 2px;
  --shadow: 0 2px 16px rgba(29,40,70,0.07);
  --shadow-lg: 0 8px 40px rgba(29,40,70,0.12);

  --header-h: 72px;
  --transition: 0.25s ease;
}

/* ============================================
   DARK MODE — CSS Variables
   ============================================ */
[data-theme="dark"] {
  --white: #0f1117;
  --off-white: #0f1117;
  --light-bg: #161b27;
  --bim-text: #e8eaf0;
  --body-text: #c8cad4;
  --muted-text: #9a9aa8;
  --border-col: rgba(255,255,255,0.07);
  --card-bg: #1a2035;
  --card-border: rgba(255,255,255,0.06);
  --header-bg: rgba(15,17,23,0.97);
  --input-bg: #1a2035;
  --shadow: 0 2px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}

/* ── THEME TOGGLE — Vertical slider ── */
/* Outer: 54x130px | Square thumb: 44x44px | Padding: 5px */

.theme-toggle-wrap {
  position: fixed;
  bottom: 36px;
  right: 36px;
  z-index: 2000;
  width: 54px;
  height: 130px;
  background: #f0ece6;
  border: 2px solid rgba(29,40,70,0.45);
  cursor: pointer;
  padding: 5px;
  box-shadow: 0 4px 20px rgba(0,0,0,0.18);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
  user-select: none;
}

.theme-toggle-wrap:hover {
  border-color: #1d2846;
  box-shadow: 0 6px 24px rgba(0,0,0,0.26);
}

/* Square thumb — width auto-fills (54-5-5=44px), height forced to 44px */
.toggle-thumb {
  position: absolute;
  left: 5px;
  right: 5px;
  top: 5px;          /* 5px gap above in light mode */
  height: 44px;
  background: #1d2846;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: top 0.42s cubic-bezier(0.4, 0, 0.2, 1), background 0.3s ease;
  z-index: 2;
}

.toggle-thumb svg {
  width: 20px;
  height: 20px;
  pointer-events: none;
  flex-shrink: 0;
}

/* LIGHT MODE — sun visible, moon hidden */
.icon-light { display: block; }
.icon-dark  { display: none; }

/* DARK MODE outer container */
[data-theme="dark"] .theme-toggle-wrap {
  background: #161b27;
  border-color: rgba(191,179,160,0.5);
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}
[data-theme="dark"] .theme-toggle-wrap:hover { border-color: #bfb3a0; }

/* DARK MODE — thumb slides to bottom, equal 5px gap (top=77px) */
[data-theme="dark"] .toggle-thumb {
  top: 77px;
  background: #ffffff;
}

/* DARK MODE — moon visible, sun hidden */
[data-theme="dark"] .icon-light { display: none; }
[data-theme="dark"] .icon-dark  { display: block; }

/* ── GLOBAL DARK OVERRIDES ──────────────── */

/* ============================================
   NUCLEAR WHITE TEXT — every element in dark mode
   ============================================ */
[data-theme="dark"] body                { background: #0f1117 !important; color: #ffffff !important; }
[data-theme="dark"] h1                  { color: #ffffff !important; }
[data-theme="dark"] h2                  { color: #ffffff !important; }
[data-theme="dark"] h3                  { color: #ffffff !important; }
[data-theme="dark"] h4                  { color: #ffffff !important; }
[data-theme="dark"] h5                  { color: #ffffff !important; }
[data-theme="dark"] h6                  { color: #ffffff !important; }
[data-theme="dark"] p                   { color: rgba(255,255,255,0.82) !important; }
[data-theme="dark"] li                  { color: rgba(255,255,255,0.82) !important; }
[data-theme="dark"] a                   { color: #ffffff !important; }
[data-theme="dark"] a:hover             { color: #bfb3a0 !important; }
[data-theme="dark"] span                { color: inherit !important; }
[data-theme="dark"] label               { color: #ffffff !important; }
[data-theme="dark"] strong              { color: #ffffff !important; }

/* Sections & backgrounds */
[data-theme="dark"] .about-section      { background: #0f1117 !important; }
[data-theme="dark"] .services-section   { background: #0c0f18 !important; }
[data-theme="dark"] .mep-section        { background: #0f1117 !important; }
[data-theme="dark"] .benefits-section   { background: #0c0f18 !important; }
[data-theme="dark"] .why-section        { background: #0f1117 !important; }
[data-theme="dark"] .contact-section    { background: #0c0f18 !important; }
[data-theme="dark"] .modelling-section  { background: #080c14 !important; }
[data-theme="dark"] .projects-section   { background: #080c14 !important; }
[data-theme="dark"] .hero               { background: #080c14 !important; }

/* Header */
[data-theme="dark"] .site-header        { background: rgba(15,17,23,0.97) !important; border-bottom-color: rgba(255,255,255,0.06) !important; }
[data-theme="dark"] .site-header.scrolled { box-shadow: 0 2px 20px rgba(0,0,0,0.4) !important; }
[data-theme="dark"] .nav-list a         { color: #ffffff !important; }
[data-theme="dark"] .dropdown           { background: #161b27 !important; }
[data-theme="dark"] .dropdown a         { color: rgba(255,255,255,0.75) !important; }
[data-theme="dark"] .dropdown a:hover   { background: #1a2035 !important; color: #ffffff !important; }
[data-theme="dark"] .hamburger span     { background: #ffffff !important; }
[data-theme="dark"] .nav-main           { background: #0f1117 !important; }
[data-theme="dark"] .logo-img           { filter: brightness(0) invert(1); }
[data-theme="dark"] .logo-bim           { color: #ffffff !important; }
[data-theme="dark"] .logo-atrix         { color: #cccccc !important; }
[data-theme="dark"] .logo-sub           { color: rgba(255,255,255,0.35) !important; }

/* Cards */
[data-theme="dark"] .mvv-card           { background: #1a2035 !important; border-left-color: #bfb3a0 !important; }
[data-theme="dark"] .mvv-card.accent    { background: #0d1220 !important; }
[data-theme="dark"] .service-card       { background: #1a2035 !important; border-color: rgba(255,255,255,0.06) !important; }
[data-theme="dark"] .service-card.featured { background: #0d1220 !important; }
[data-theme="dark"] .benefit-item       { background: #1a2035 !important; border-top-color: rgba(255,255,255,0.05) !important; }
[data-theme="dark"] .why-card           { background: transparent !important; border-color: rgba(255,255,255,0.08) !important; }
[data-theme="dark"] .project-card       { background: rgba(255,255,255,0.03) !important; border-color: rgba(255,255,255,0.08) !important; }
[data-theme="dark"] .model-item         { background: rgba(255,255,255,0.04) !important; border-color: rgba(255,255,255,0.08) !important; }
[data-theme="dark"] .mep-block          { background: #0f1117 !important; }
[data-theme="dark"] .mep-block:first-child { background: #1a2035 !important; border-right-color: rgba(255,255,255,0.07) !important; }
[data-theme="dark"] .mep-grid           { border-color: rgba(255,255,255,0.07) !important; }

/* Accent colours — keep warm tone */
[data-theme="dark"] .section-label      { color: #bfb3a0 !important; }
[data-theme="dark"] .service-phase      { color: #bfb3a0 !important; }
[data-theme="dark"] .contact-label      { color: #bfb3a0 !important; }
[data-theme="dark"] .benefit-num        { color: #bfb3a0 !important; }
[data-theme="dark"] .stat-num           { color: #bfb3a0 !important; }
[data-theme="dark"] .project-tag        { color: #bfb3a0 !important; border-color: rgba(191,179,160,0.25) !important; }
[data-theme="dark"] .footer-col h5      { color: #bfb3a0 !important; }
[data-theme="dark"] .footer-tagline     { color: #bfb3a0 !important; }
[data-theme="dark"] .service-icon       { color: #bfb3a0 !important; }
[data-theme="dark"] .mvv-icon           { color: #bfb3a0 !important; }

/* Dimmer secondary */
[data-theme="dark"] .stat-label         { color: rgba(255,255,255,0.45) !important; }
[data-theme="dark"] .project-sub        { color: rgba(255,255,255,0.4) !important; }
[data-theme="dark"] .footer-col li      { color: rgba(255,255,255,0.5) !important; }
[data-theme="dark"] .footer-col a       { color: rgba(255,255,255,0.5) !important; }
[data-theme="dark"] .footer-brand p     { color: rgba(255,255,255,0.5) !important; }
[data-theme="dark"] .footer-bottom p    { color: rgba(255,255,255,0.25) !important; }
[data-theme="dark"] .footer-bottom      { border-top-color: rgba(255,255,255,0.06) !important; }
[data-theme="dark"] .site-footer        { background: #060910 !important; }

/* Contact form */
[data-theme="dark"] .contact-form       { background: #1a2035 !important; border-color: rgba(255,255,255,0.07) !important; }
[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group select,
[data-theme="dark"] .form-group textarea { background: #0f1117 !important; border-color: rgba(255,255,255,0.1) !important; color: #ffffff !important; }
[data-theme="dark"] .form-group input::placeholder,
[data-theme="dark"] .form-group textarea::placeholder { color: rgba(255,255,255,0.25) !important; }
[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group select:focus,
[data-theme="dark"] .form-group textarea:focus { border-color: #bfb3a0 !important; box-shadow: 0 0 0 3px rgba(191,179,160,0.1) !important; }

/* Why section numbers */
[data-theme="dark"] .why-num            { background: rgba(191,179,160,0.15) !important; color: #bfb3a0 !important; }

/* Hero */
[data-theme="dark"] .hero-eyebrow       { color: #bfb3a0 !important; }

/* Transition for smooth mode switch */
body,
.site-header,
.about-section,
.services-section,
.mep-section,
.benefits-section,
.why-section,
.contact-section,
.site-footer,
.mvv-card,
.service-card,
.benefit-item,
.why-card,
.model-item,
.mep-block,
.contact-form,
.form-group input,
.form-group select,
.form-group textarea,
.dropdown,
.nav-main {
  transition:
    background var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    color var(--transition),
    box-shadow var(--transition);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-main);
  color: var(--bim);
  background: var(--white);
  line-height: 1.65;
  overflow-x: hidden;
}

[data-theme="dark"] body,
html[data-theme="dark"] body {
  color: #c8cad4;
  background: #0f1117;
}

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--muted); }

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

ul { list-style: none; }

/* ============================================
   UTILITY
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-header.light .section-title,
.section-header.light .section-desc { color: var(--white); }
.section-header.light .section-label { color: var(--warm); }

.section-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 10px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.5vw, 2.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 16px;
  color: var(--bim);
}

.section-desc {
  font-size: 1rem;
  color: var(--muted);
  line-height: 1.7;
}

.mt-1 { margin-top: 1.5rem; }

/* Logo */
.logo {
  display: flex;
  flex-wrap: nowrap;
  align-items: center;
  gap: 0 10px;
  line-height: 1;
}

.logo-img {
  height: 42px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.logo-text {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 2px;
}

.logo-bim {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.65rem;
  color: var(--bim);
  letter-spacing: 0.06em;
}

.logo-atrix {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.65rem;
  color: var(--atrix);
  letter-spacing: 0.06em;
}

.logo-sub {
  display: block;
  width: 100%;
  font-size: 0.52rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 2px;
}

.accent-bim { color: var(--bim); }
.accent-atrix { color: var(--atrix); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-main);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: 0;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--bim);
  color: var(--white);
  border-color: var(--bim);
}

.btn-primary:hover {
  background: #263461;
  border-color: #263461;
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.35);
}

.btn-outline:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.6);
  color: var(--white);
}

.btn-full { width: 100%; justify-content: center; }

/* ============================================
   HEADER / NAV
   ============================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--header-h);
  background: rgba(255,255,255,0.97);
  border-bottom: 1px solid rgba(191,179,160,0.25);
  backdrop-filter: blur(8px);
  transition: box-shadow var(--transition), background var(--transition);
}

.site-header.scrolled {
  box-shadow: var(--shadow);
  background: rgba(255,255,255,0.99);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-header .logo { flex-shrink: 0; }
.site-header .logo-bim { color: var(--bim); }

.nav-main {
  display: flex;
  align-items: center;
  gap: 0;
  margin-left: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 0;
}

.nav-list li { position: relative; }

.nav-list a {
  display: block;
  padding: 0 1.1rem;
  height: var(--header-h);
  line-height: var(--header-h);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--bim);
  letter-spacing: 0.02em;
  transition: color var(--transition);
}

.nav-list a:hover { color: var(--muted); }

.chevron { font-style: normal; font-size: 0.8rem; }

/* Dropdown */
.dropdown {
  display: none;
  position: absolute;
  top: 100%; left: 0;
  background: var(--white);
  box-shadow: var(--shadow-lg);
  border-top: 3px solid var(--warm);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  min-width: 220px;
  padding: 8px 0;
  z-index: 100;
}

.has-dropdown:hover .dropdown { display: block; }

.dropdown a {
  height: auto;
  line-height: 1;
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--muted);
}

.dropdown a:hover { color: var(--bim); background: var(--light-bg); }

.nav-cta { margin-left: 1.5rem; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  margin-left: auto;
  padding: 4px;
}

.hamburger span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--bim);
  border-radius: 2px;
  transition: all var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--bim);
  position: relative;
  overflow: hidden;
  padding-top: var(--header-h);
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(191,179,160,0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(191,179,160,0.07) 1px, transparent 1px);
  background-size: 60px 60px;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: 0; right: 0;
  width: 55%;
  height: 100%;
  background: linear-gradient(135deg, transparent 30%, rgba(191,179,160,0.06) 100%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 2rem;
  width: 100%;
}

.hero-eyebrow {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 6.5rem);
  font-weight: 800;
  line-height: 1.0;
  color: var(--white);
  margin-bottom: 28px;
  max-width: 680px;
}

.hero-title em {
  font-style: normal;
  color: var(--warm);
}

.hero-desc {
  font-size: 1.1rem;
  color: rgba(255,255,255,0.72);
  max-width: 520px;
  line-height: 1.75;
  margin-bottom: 40px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  border-top: 1px solid rgba(191,179,160,0.2);
  padding-top: 32px;
}

.stat {}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--warm);
  line-height: 1;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
}

.hero-visual {
  position: absolute;
  right: -80px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
}

.hex-cluster {
  position: relative;
  width: 500px;
  height: 500px;
}

.hex {
  position: absolute;
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
}

.hex-1 {
  width: 280px; height: 280px;
  background: rgba(191,179,160,0.08);
  top: 50px; left: 80px;
}

.hex-2 {
  width: 200px; height: 200px;
  background: rgba(191,179,160,0.05);
  top: 0; left: 220px;
}

.hex-3 {
  width: 160px; height: 160px;
  background: rgba(191,179,160,0.1);
  top: 240px; left: 260px;
}

.hex-4 {
  width: 120px; height: 120px;
  background: rgba(112,103,104,0.08);
  top: 80px; left: 10px;
}

/* ============================================
   ABOUT
   ============================================ */
.about-section { background: var(--white); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

.about-text h2 { margin-bottom: 20px; }
.about-text p { color: var(--muted); margin-bottom: 14px; }
.about-text strong { color: var(--bim); }

.about-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mvv-card {
  background: var(--light-bg);
  border-left: 3px solid var(--warm);
  border-radius: 0;
  padding: 28px 32px;
  transition: box-shadow var(--transition);
}

.mvv-card:hover {
  box-shadow: var(--shadow);
}

.mvv-card.accent {
  background: var(--bim);
  border-color: var(--warm);
}

.mvv-card.accent h3,
.mvv-card.accent p { color: var(--white); }
.mvv-card.accent .mvv-icon { color: var(--warm); }

.mvv-icon {
  width: 28px;
  height: 28px;
  margin-bottom: 14px;
  color: var(--warm);
}

.mvv-icon svg { width: 100%; height: 100%; }

.mvv-card h3 {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--bim);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  margin-bottom: 10px;
}

.mvv-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ============================================
   SERVICES
   ============================================ */
.services-section { background: var(--light-bg); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--white);
  border-radius: 0;
  padding: 40px 36px;
  box-shadow: none;
  border: 1px solid rgba(191,179,160,0.25);
  transition: border-color var(--transition), box-shadow var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 2px;
  background: var(--warm);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.service-card:hover::after { transform: scaleX(1); }

.service-card:hover {
  border-color: rgba(191,179,160,0.5);
  box-shadow: var(--shadow);
}

.service-card.featured {
  background: var(--bim);
  color: var(--white);
  border-color: var(--bim);
}

.service-card.featured .service-phase,
.service-card.featured h3,
.service-card.featured p { color: var(--white); }

.service-card.featured .service-list li { color: rgba(255,255,255,0.65); }
.service-card.featured .service-list li::before { color: var(--warm); }
.service-card.featured .service-list li { border-bottom-color: rgba(255,255,255,0.08); }
.service-card.featured::after { background: var(--warm); }

.service-icon {
  width: 48px; height: 48px;
  margin-bottom: 16px;
  color: var(--warm);
}

.service-icon svg { width: 100%; height: 100%; }

.service-phase {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 10px;
}

.service-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--bim);
  margin-bottom: 12px;
}

.service-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 20px;
}

.service-list { padding: 0; }

.service-list li {
  font-size: 0.84rem;
  color: var(--muted);
  padding: 6px 0;
  border-bottom: 1px solid rgba(191,179,160,0.2);
  display: flex;
  align-items: center;
  gap: 8px;
}

.service-list li::before {
  content: '›';
  color: var(--warm);
  font-size: 1.1rem;
  font-weight: 700;
}

/* ============================================
   3D MODELLING
   ============================================ */
.modelling-section { background: var(--bim); }
.modelling-section .section-title { color: var(--white); }
.modelling-section .section-desc { color: rgba(255,255,255,0.6); }

.models-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.model-item {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(191,179,160,0.12);
  border-radius: 0;
  padding: 32px 24px;
  text-align: center;
  transition: background var(--transition), border-color var(--transition);
  cursor: default;
}

.model-item:hover {
  background: rgba(191,179,160,0.08);
  border-color: rgba(191,179,160,0.3);
}

.model-item.highlight {
  background: rgba(191,179,160,0.1);
  border-color: rgba(191,179,160,0.3);
}

.model-icon {
  width: 48px; height: 48px;
  border-radius: 0;
  margin: 0 auto 16px;
  position: relative;
}

.model-icon.arch { background: linear-gradient(135deg, #bfb3a0 0%, #cec4b4 100%); }
.model-icon.struct { background: linear-gradient(135deg, #706768 0%, #857b7c 100%); }
.model-icon.mech { background: linear-gradient(135deg, #3d5a8a 0%, #5a7aaa 100%); }
.model-icon.elec { background: linear-gradient(135deg, #b8952a 0%, #c8a84a 100%); }
.model-icon.pd { background: linear-gradient(135deg, #4a7a4e 0%, #6a9a6e 100%); }
.model-icon.fed { background: linear-gradient(135deg, #bfb3a0 0%, #1d2846 100%); }

.model-item h4 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ============================================
   MEP
   ============================================ */
.mep-section { background: var(--white); }

.mep-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid rgba(191,179,160,0.25);
  border-radius: 0;
  overflow: hidden;
}

.mep-block {
  padding: 56px 52px;
}

.mep-block:first-child {
  background: var(--light-bg);
  border-right: 1px solid rgba(191,179,160,0.25);
}

.mep-block .section-title { margin-bottom: 16px; font-size: 1.5rem; }
.mep-block p { color: var(--muted); line-height: 1.75; }

/* ============================================
   BENEFITS
   ============================================ */
.benefits-section { background: var(--light-bg); }

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 20px;
}

.benefit-item {
  background: var(--white);
  border-radius: 0;
  padding: 24px 20px;
  transition: border-color var(--transition), box-shadow var(--transition);
  border-bottom: 2px solid transparent;
  border-top: 1px solid rgba(191,179,160,0.2);
}

.benefit-item:hover {
  border-bottom-color: var(--warm);
  box-shadow: var(--shadow);
}

.benefit-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--warm);
  line-height: 1;
  margin-bottom: 10px;
  opacity: 0.7;
}

.benefit-item p {
  font-size: 0.84rem;
  color: var(--muted);
  line-height: 1.6;
}

/* ============================================
   WHY US
   ============================================ */
.why-section { background: var(--white); }

.why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.why-card {
  padding: 28px 26px;
  border-radius: 0;
  border: 1px solid rgba(191,179,160,0.25);
  border-top: 2px solid transparent;
  transition: border-top-color var(--transition), box-shadow var(--transition);
}

.why-card:hover {
  border-top-color: var(--warm);
  box-shadow: var(--shadow);
}

.why-num {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  background: var(--bim);
  color: var(--white);
  font-size: 0.72rem;
  font-weight: 700;
  border-radius: 0;
  margin-bottom: 14px;
  letter-spacing: 0.04em;
}

.why-card h4 {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--bim);
  margin-bottom: 8px;
  letter-spacing: 0.01em;
}

.why-card p {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.65;
}

/* ============================================
   PROJECTS
   ============================================ */
.projects-section { background: var(--bim); }
.projects-section .section-title { color: var(--white); }
.projects-section .section-desc { color: rgba(255,255,255,0.6); }

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.project-card {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(191,179,160,0.12);
  border-radius: 0;
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.project-card:hover {
  border-color: rgba(191,179,160,0.35);
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
}

.project-img {
  height: 200px;
  background-size: cover;
  background-position: center;
  position: relative;
}

/* Gradient placeholder backgrounds for project images */
.img-1 { background: linear-gradient(135deg, #1a3a5c 0%, #2d6a9f 50%, #1d3d5a 100%); }
.img-2 { background: linear-gradient(135deg, #c8b89a 0%, #a89070 50%, #d4c4a8 100%); }
.img-3 { background: linear-gradient(135deg, #4a6fa5 0%, #8ab4d4 50%, #6090b8 100%); }
.img-4 { background: linear-gradient(135deg, #3a3a3a 0%, #6a6a6a 50%, #4a4a4a 100%); }
.img-5 { background: linear-gradient(135deg, #1d2846 0%, #4a6fa5 50%, #2d4a7a 100%); }
.img-6 { background: linear-gradient(135deg, #2a5a4a 0%, #4a8a6a 50%, #1e4a3a 100%); }

.project-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(29,40,70,0.6), transparent);
}

.project-info {
  padding: 22px 24px;
}

.project-tag {
  display: inline-block;
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--warm);
  background: rgba(191,179,160,0.1);
  border: 1px solid rgba(191,179,160,0.2);
  padding: 3px 10px;
  border-radius: 2px;
  margin-bottom: 10px;
}

.project-info h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 4px;
}

.project-sub {
  font-size: 0.78rem;
  color: rgba(255,255,255,0.45);
}

/* ============================================
   CONTACT
   ============================================ */
.contact-section { background: var(--light-bg); }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 80px;
  align-items: start;
}

.contact-info .section-title { margin-bottom: 36px; }

.contact-details {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.contact-icon {
  width: 38px; height: 38px;
  flex-shrink: 0;
  background: var(--bim);
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 9px;
  color: var(--warm);
}

.contact-icon svg { width: 100%; height: 100%; }

.contact-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 4px;
}

.contact-item p, .contact-item a {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.55;
}

.contact-item a:hover { color: var(--bim); }

/* Form */
.contact-form {
  background: var(--white);
  border-radius: 0;
  padding: 40px;
  box-shadow: none;
  border: 1px solid rgba(191,179,160,0.25);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bim);
  margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid rgba(191,179,160,0.4);
  border-radius: var(--radius);
  font-family: var(--font-main);
  font-size: 0.9rem;
  color: var(--bim);
  background: var(--white);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  appearance: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--bim);
  box-shadow: 0 0 0 3px rgba(29,40,70,0.08);
}

.form-group textarea { resize: vertical; }

.form-success {
  display: none;
  text-align: center;
  color: #2a7a4a;
  font-weight: 600;
  font-size: 0.9rem;
  margin-top: 12px;
  padding: 12px;
  background: #e8f5ed;
  border-radius: var(--radius);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer { background: var(--bim); }

.footer-top { padding: 80px 0 56px; }

.footer-grid {
  display: grid;
  grid-template-columns: 1.8fr 1fr 1fr 1.4fr;
  gap: 48px;
}

.footer-brand .logo-bim { color: var(--white); font-size: 2rem; }
.footer-brand .logo-atrix { color: var(--atrix); font-size: 2rem; }
.footer-brand .logo-sub { color: rgba(255,255,255,0.4); }

.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  line-height: 1.7;
  margin-top: 16px;
}

.footer-tagline {
  font-size: 0.78rem !important;
  color: var(--warm) !important;
  margin-top: 12px !important;
}

.footer-col h5 {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--warm);
  margin-bottom: 18px;
}

.footer-col ul li {
  margin-bottom: 10px;
}

.footer-col ul li a,
.footer-col ul li {
  font-size: 0.86rem;
  color: rgba(255,255,255,0.5);
  transition: color var(--transition);
}

.footer-col ul li a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 20px 0;
}

.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ============================================
   RESPONSIVE — TABLET (max 1024px)
   ============================================ */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .services-grid { grid-template-columns: 1fr 1fr; }
  .models-grid { grid-template-columns: repeat(3, 1fr); }
  .benefits-grid { grid-template-columns: repeat(3, 1fr); }
  .why-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }

  .hero-visual { display: none; }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

/* ============================================
   RESPONSIVE — MOBILE (max 768px)
   ============================================ */
@media (max-width: 768px) {
  :root { --header-h: 60px; }

  .section { padding: 60px 0; }

  .hamburger { display: flex; }

  .nav-main {
    display: none;
    position: fixed;
    top: var(--header-h);
    left: 0; right: 0; bottom: 0;
    background: var(--white);
    flex-direction: column;
    align-items: stretch;
    padding: 24px 0;
    overflow-y: auto;
    z-index: 999;
    margin: 0;
    gap: 0;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
  }

  .nav-main.open { display: flex; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
  }

  .nav-list a {
    height: auto;
    line-height: 1;
    padding: 16px 28px;
    border-bottom: 1px solid rgba(191,179,160,0.15);
    font-size: 1rem;
  }

  .dropdown {
    position: static;
    display: none;
    box-shadow: none;
    border: none;
    border-top: none;
    background: var(--light-bg);
    padding: 0;
  }

  .has-dropdown.open .dropdown { display: block; }

  .nav-cta {
    margin: 20px 28px 0;
    width: calc(100% - 56px);
    justify-content: center;
  }

  .hero-title { font-size: 3rem; }
  .hero-stats { gap: 28px; }
  .hero-content { padding: 60px 1.5rem; }

  .services-grid { grid-template-columns: 1fr; }
  .models-grid { grid-template-columns: repeat(2, 1fr); }
  .mep-grid { grid-template-columns: 1fr; }
  .mep-block { padding: 36px 28px; }
  .mep-block:first-child { border-right: none; border-bottom: 1px solid rgba(191,179,160,0.3); }
  .benefits-grid { grid-template-columns: repeat(2, 1fr); }
  .why-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }

  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-top { padding: 48px 0 32px; }
  .footer-bottom .container { flex-direction: column; text-align: center; }

  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 24px; }

  .section-title { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 1.25rem; }
  .benefits-grid { grid-template-columns: 1fr; }
  .models-grid { grid-template-columns: 1fr 1fr; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; justify-content: center; }
}