/* ============================================================
   EBS — Engineering & Building Solutions
   css/style.css — Feuille de style unique
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@300;400;500;600&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* ── RESET & BASE ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-dark:    #1E3320;
  --c-prim:    #3A6E38;
  --c-mid:     #7AAD78;
  --c-accent:  #B2D2B0;
  --c-surf:    #E8F2E8;
  --c-bg:      #F5F7F5;
  --c-bronze:  #C8A86A;
  --c-muted:   #5A6A58;
  --c-label:   #5A8C58;
  --c-border:  #DFE6DF;
  --c-white:   #ffffff;

  --f-sans: 'Manrope', sans-serif;
  --f-mono: 'IBM Plex Mono', monospace;

  --r: 3px;
  --r-md: 4px;
  --border: 0.5px solid var(--c-border);

  --max-w: 1120px;
  --pad-x: clamp(20px, 5vw, 60px);
  --pad-section: clamp(60px, 8vw, 100px);
}

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

body {
  font-family: var(--f-sans);
  background: var(--c-bg);
  color: var(--c-dark);
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  /* Subtle grid pattern */
  background-image:
    linear-gradient(var(--c-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--c-border) 1px, transparent 1px);
  background-size: 40px 40px;
  background-attachment: fixed;
}

/* ── TYPOGRAPHY ───────────────────────────────────────────── */
h1, h2, h3, h4 { font-weight: 300; color: var(--c-dark); line-height: 1.18; letter-spacing: -0.01em; }
h1 { font-size: clamp(32px, 5vw, 52px); font-weight: 300; }
h2 { font-size: clamp(22px, 3vw, 32px); }
h3 { font-size: clamp(16px, 2vw, 20px); font-weight: 500; }
h4 { font-size: 14px; font-weight: 500; }

p { font-size: 14px; color: var(--c-muted); line-height: 1.75; }

.mono {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-label);
}

.kicker {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-label);
  display: block;
  margin-bottom: 14px;
}

/* ── LAYOUT ───────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

section { padding: var(--pad-section) 0; }

.section-header { margin-bottom: 48px; }
.section-header .kicker { margin-bottom: 10px; }

/* ── NAV ──────────────────────────────────────────────────── */
#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(245, 247, 245, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: var(--border);
  transition: background 0.3s;
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-brand img {
  height: 37px;
  width: auto;
  display: block;
}

.nav-brand-sub {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  color: var(--c-label);
  text-transform: lowercase;
  align-self: center;
  padding-bottom: 0;
  transform: translateY(7px);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  font-weight: 400;
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s;
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0; right: 0;
  height: 1px;
  background: var(--c-prim);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.25s ease;
}

.nav-links a:hover,
.nav-links a.active { color: var(--c-prim); }
.nav-links a:hover::after,
.nav-links a.active::after { transform: scaleX(1); }

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: 2px;
  border: var(--border);
  border-radius: var(--r);
  overflow: hidden;
  flex-shrink: 0;
}

.lang-btn {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  padding: 5px 9px;
  background: transparent;
  border: none;
  color: var(--c-muted);
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}

.lang-btn.active,
.lang-btn:hover {
  background: var(--c-prim);
  color: var(--c-white);
}

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--c-dark);
  transition: transform 0.3s, opacity 0.3s;
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* Mobile nav */
.nav-mobile {
  display: none;
  flex-direction: column;
  border-top: var(--border);
  background: var(--c-bg);
  padding: 16px var(--pad-x) 20px;
  gap: 4px;
}

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

.nav-mobile a {
  font-size: 14px;
  color: var(--c-muted);
  text-decoration: none;
  padding: 10px 0;
  border-bottom: var(--border);
}

.nav-mobile a:last-child { border-bottom: none; }

/* ── BUTTONS ──────────────────────────────────────────────── */
.btn-prim {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-sans);
  font-size: 13px;
  font-weight: 500;
  background: var(--c-prim);
  color: var(--c-white);
  border: none;
  padding: 11px 24px;
  border-radius: var(--r);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  letter-spacing: 0.01em;
}

.btn-prim:hover { background: var(--c-dark); transform: translateY(-1px); }

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-sans);
  font-size: 13px;
  font-weight: 400;
  background: transparent;
  color: var(--c-prim);
  border: 0.5px solid var(--c-prim);
  padding: 11px 24px;
  border-radius: var(--r);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, transform 0.15s;
}

.btn-outline:hover {
  background: var(--c-prim);
  color: var(--c-white);
  transform: translateY(-1px);
}

/* ── HERO ─────────────────────────────────────────────────── */
#hero {
  padding-top: calc(58px + 80px);
  padding-bottom: 80px;
  background: transparent;
  position: relative;
  overflow: hidden;
}

.hero-accent-bar {
  position: absolute;
  top: 58px;
  left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c-prim) 0%, var(--c-mid) 50%, var(--c-accent) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 60px;
  align-items: start;
}

.hero-kicker {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-label);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.hero-kicker::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 1px;
  background: var(--c-prim);
}

.hero-title {
  font-size: clamp(36px, 5.5vw, 64px);
  font-weight: 300;
  color: var(--c-dark);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 28px;
}

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

.hero-subtitle {
  font-size: 15px;
  color: var(--c-muted);
  line-height: 1.7;
  margin-bottom: 36px;
  max-width: 540px;
  font-weight: 300;
}

.hero-cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

/* Hero right panel */
.hero-panel {
  background: var(--c-white);
  border: var(--border);
  border-radius: var(--r-md);
  padding: 28px;
  position: relative;
}

.hero-panel-label {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-label);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: var(--border);
}

.hero-stat-row {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.hero-stat {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 16px;
  background: var(--c-bg);
  border-radius: var(--r);
  border-left: 2px solid var(--c-accent);
}

.hero-stat-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--r);
  background: var(--c-surf);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.hero-stat-icon svg { width: 16px; height: 16px; stroke: var(--c-prim); fill: none; stroke-width: 1.5; }

.hero-stat-content {}
.hero-stat-value { font-size: 13px; font-weight: 500; color: var(--c-dark); }
.hero-stat-desc { font-size: 11px; color: var(--c-muted); margin-top: 1px; font-family: var(--f-mono); letter-spacing: 0.04em; }

/* Hero location badge */
.hero-location {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 20px;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-label);
  background: var(--c-surf);
  border: var(--border);
  border-radius: var(--r);
  padding: 6px 12px;
}

.hero-location svg { width: 10px; height: 10px; stroke: var(--c-label); fill: none; stroke-width: 1.5; }

/* ── PHILOSOPHY STRIP ─────────────────────────────────────── */
#philosophy-strip {
  padding: 0;
  border-top: var(--border);
  border-bottom: var(--border);
  background: var(--c-dark);
  overflow: hidden;
}

.philosophy-strip-inner {
  padding: 48px var(--pad-x);
  max-width: var(--max-w);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 60px;
  align-items: center;
}

.philosophy-strip-label {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-mid);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
}

.philosophy-strip-text {
  font-size: clamp(16px, 2.2vw, 22px);
  font-weight: 300;
  color: var(--c-accent);
  line-height: 1.55;
  letter-spacing: -0.01em;
}

.philosophy-strip-text strong {
  font-weight: 500;
  color: var(--c-white);
}

/* ── EXPERTISE SECTION ────────────────────────────────────── */
#expertise {
  background: transparent;
}

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-border);
}

.expertise-card {
  background: var(--c-white);
  padding: 28px 26px;
  transition: background 0.2s;
  position: relative;
}

.expertise-card:hover { background: var(--c-surf); }

.exp-card-num {
  font-family: var(--f-mono);
  font-size: 9px;
  color: var(--c-accent);
  letter-spacing: 0.1em;
  margin-bottom: 16px;
}

.exp-card-icon {
  width: 36px; height: 36px;
  border-radius: var(--r);
  border: var(--border);
  background: var(--c-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.exp-card-icon svg { width: 18px; height: 18px; stroke: var(--c-prim); fill: none; stroke-width: 1.3; }

.exp-card-title {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-dark);
  margin-bottom: 8px;
  line-height: 1.3;
}

.exp-card-body {
  font-size: 12.5px;
  color: var(--c-muted);
  line-height: 1.65;
}

.exp-card-tag {
  display: inline-block;
  margin-top: 14px;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: var(--c-surf);
  color: var(--c-label);
  border: 0.5px solid var(--c-accent);
  border-radius: 2px;
  padding: 3px 8px;
}

/* ── APPROACH SECTION ─────────────────────────────────────── */
#approach {
  background: var(--c-white);
  border-top: var(--border);
  border-bottom: var(--border);
}

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

.approach-text-col {}

.approach-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: 32px;
}

.approach-step {
  display: flex;
  gap: 20px;
  padding: 20px 0;
  border-bottom: var(--border);
}

.approach-step:last-child { border-bottom: none; }

.step-num {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--c-accent);
  letter-spacing: 0.08em;
  flex-shrink: 0;
  width: 28px;
  padding-top: 2px;
}

.step-content {}
.step-title { font-size: 13px; font-weight: 500; color: var(--c-dark); margin-bottom: 4px; }
.step-body { font-size: 12.5px; color: var(--c-muted); line-height: 1.65; }

/* Approach diagram column */
.approach-diagram-col {
  position: relative;
}

.approach-diagram {
  border: var(--border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  padding: 32px;
  position: relative;
}

.diag-label {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--c-label);
  margin-bottom: 24px;
}

.diag-items {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.diag-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--r);
  background: var(--c-white);
  border: var(--border);
}

.diag-item-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.diag-item-text { font-size: 12px; color: var(--c-dark); font-weight: 400; }
.diag-item-sub { font-size: 11px; color: var(--c-muted); font-family: var(--f-mono); letter-spacing: 0.04em; margin-left: auto; }

.diag-connector {
  text-align: center;
  font-family: var(--f-mono);
  font-size: 9px;
  color: var(--c-accent);
  letter-spacing: 0.1em;
  padding: 4px 0;
}

/* ── SPECIALISATIONS ──────────────────────────────────────── */
#solutions {
  background: transparent;
}

.solutions-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  border: var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--c-border);
  margin-top: 0;
}

.solution-item {
  background: var(--c-white);
  padding: 24px 26px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: background 0.2s;
}

.solution-item:hover { background: var(--c-surf); }

.sol-marker {
  width: 3px;
  flex-shrink: 0;
  align-self: stretch;
  border-radius: 2px;
  margin-top: 2px;
}

.sol-content {}
.sol-title { font-size: 13px; font-weight: 500; color: var(--c-dark); margin-bottom: 5px; }
.sol-body { font-size: 12px; color: var(--c-muted); line-height: 1.6; }

/* ── REFERENCES PLACEHOLDER ───────────────────────────────── */
#references {
  background: var(--c-white);
  border-top: var(--border);
  border-bottom: var(--border);
}

.ref-placeholder {
  border: 0.5px dashed var(--c-accent);
  border-radius: var(--r-md);
  padding: 60px 40px;
  text-align: center;
  background: var(--c-surf);
}

.ref-placeholder-icon {
  width: 44px; height: 44px;
  border: var(--border);
  border-radius: var(--r-md);
  background: var(--c-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
}

.ref-placeholder-icon svg { width: 20px; height: 20px; stroke: var(--c-prim); fill: none; stroke-width: 1.3; }

.ref-placeholder h3 { font-size: 15px; font-weight: 500; color: var(--c-dark); margin-bottom: 8px; }
.ref-placeholder p { font-size: 13px; color: var(--c-muted); max-width: 380px; margin: 0 auto; }

/* ── CTA SECTION ──────────────────────────────────────────── */
#cta-section {
  background: var(--c-dark);
  padding: 80px 0;
}

.cta-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: center;
}

.cta-kicker {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-mid);
  margin-bottom: 12px;
}

.cta-title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 300;
  color: var(--c-white);
  line-height: 1.25;
}

.cta-title span { color: var(--c-mid); }

.btn-light {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--f-sans);
  font-size: 13px;
  font-weight: 500;
  background: var(--c-white);
  color: var(--c-dark);
  border: none;
  padding: 12px 26px;
  border-radius: var(--r);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.15s;
  white-space: nowrap;
}

.btn-light:hover { background: var(--c-accent); transform: translateY(-1px); }

/* ── FOOTER ───────────────────────────────────────────────── */
#footer {
  background: var(--c-bg);
  border-top: var(--border);
  padding: 48px 0 24px;
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: var(--border);
}

.footer-brand img { height: 31px; margin-bottom: 10px; display: block; }
.footer-brand-img { height: 31px; margin-bottom: 8px; display: block; }
.footer-brand-name { font-size: 13px; font-weight: 600; letter-spacing: 0.08em; color: var(--c-dark); }
.footer-brand-sub {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-label);
  margin-top: 0;
  margin-bottom: 16px;
  display: block;
}

.footer-desc { font-size: 12px; color: var(--c-muted); line-height: 1.7; }

.footer-col-title {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--c-label);
  margin-bottom: 16px;
}

.footer-links { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.footer-links a { font-size: 13px; color: var(--c-muted); text-decoration: none; transition: color 0.2s; }
.footer-links a:hover { color: var(--c-prim); }

.footer-contact-item {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-bottom: 10px;
}

.footer-contact-item svg { width: 13px; height: 13px; stroke: var(--c-label); fill: none; stroke-width: 1.5; flex-shrink: 0; margin-top: 2px; }
.footer-contact-item span { font-size: 12px; color: var(--c-muted); line-height: 1.5; }
.footer-contact-item a { color: var(--c-muted); text-decoration: none; }
.footer-contact-item a:hover { color: var(--c-prim); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 20px;
  flex-wrap: wrap;
  gap: 8px;
}

.footer-copy { font-family: var(--f-mono); font-size: 9px; color: var(--c-label); letter-spacing: 0.06em; }
.footer-ide { font-family: var(--f-mono); font-size: 9px; color: var(--c-accent); letter-spacing: 0.06em; }

/* ── ANIMATIONS ───────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

/* stagger delays */
.fade-in:nth-child(1) { transition-delay: 0.05s; }
.fade-in:nth-child(2) { transition-delay: 0.12s; }
.fade-in:nth-child(3) { transition-delay: 0.19s; }
.fade-in:nth-child(4) { transition-delay: 0.26s; }
.fade-in:nth-child(5) { transition-delay: 0.33s; }
.fade-in:nth-child(6) { transition-delay: 0.40s; }

/* ── RESPONSIVE ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-panel { display: none; }
  .expertise-grid { grid-template-columns: repeat(2, 1fr); }
  .approach-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  .solutions-list { grid-template-columns: 1fr; }
  .philosophy-strip-inner { grid-template-columns: 1fr; gap: 20px; }
  .philosophy-strip-label { writing-mode: horizontal-tb; transform: none; }
  .cta-inner { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .expertise-grid { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; }
  .solutions-list { grid-template-columns: 1fr; }
}

/* ── UTILITY ──────────────────────────────────────────────── */
.bronze { color: var(--c-bronze); }
.text-prim { color: var(--c-prim); }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-32 { margin-top: 32px; }