:root {
  --navy: #031922;
  --navy-deep: #011117;
  --navy-soft: #06242e;
  --gold: #dfb556;
  --gold-light: #f2d37f;
  --cream: #f4efe6;
  --muted: #cfd9da;
  --line: rgba(223,181,86,.28);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--navy); color: var(--cream); font-family: Arial, Helvetica, sans-serif; }
body.no-scroll { overflow: hidden; }
a { color: inherit; }
button { font: inherit; }
img { max-width: 100%; }

.site-header {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 34px;
  min-height: 190px;
  padding: 14px clamp(34px, 4vw, 72px);
  background: rgba(1, 20, 27, .3);
  border-bottom: 1px solid rgba(255,255,255,.12);
  backdrop-filter: blur(5px);
}
.brand img { display: block; width: 440px; height: 192px; object-fit: contain; }
.main-nav { display: flex; justify-content: center; gap: clamp(34px, 4vw, 70px); }
.main-nav a { text-decoration: none; color: #f4efe6; font-size: 1.05rem; transition: color .2s ease; }
.main-nav a:hover { color: var(--gold-light); }
.header-project {
  text-decoration: none;
  color: var(--gold-light);
  text-transform: uppercase;
  font-size: .82rem;
  font-weight: 800;
  letter-spacing: .13em;
  padding: 12px 0 11px;
  border-bottom: 2px solid var(--gold);
}
.menu-toggle { display: none; }

.hero {
  min-height: 100svh;
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(360px, .84fr);
  align-items: center;
  gap: clamp(40px, 5vw, 90px);
  padding: 245px clamp(44px, 6vw, 96px) 90px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 77% 36%, rgba(16, 157, 173, .20), transparent 26%),
    radial-gradient(circle at 18% 90%, rgba(223, 181, 86, .14), transparent 32%),
    linear-gradient(130deg, #02131a 0%, #03212a 52%, #021820 100%);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    repeating-radial-gradient(circle at 20% 90%, rgba(223,181,86,.035) 0 2px, transparent 3px 13px),
    linear-gradient(115deg, transparent 0 62%, rgba(8,111,126,.08) 72%, transparent 84%);
  opacity: .8;
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  left: -12%; right: -10%; bottom: -28%; height: 52%;
  background: radial-gradient(ellipse, rgba(0, 133, 151, .19), transparent 67%);
  pointer-events: none;
}
.hero-content, .hero-visual { position: relative; z-index: 1; }
.eyebrow { margin: 0 0 20px; color: var(--gold-light); text-transform: uppercase; letter-spacing: .23em; font-size: .82rem; font-weight: 800; }
.hero h1 {
  margin: 0;
  max-width: 820px;
  font-family: Georgia, 'Times New Roman', serif;
  font-size: clamp(4.2rem, 7.2vw, 8rem);
  font-weight: 400;
  line-height: .88;
  letter-spacing: -.045em;
}
.hero h1 em { display: block; color: var(--gold-light); font-weight: 400; }
.hero-text { max-width: 690px; margin: 34px 0 0; color: var(--muted); font-size: clamp(1.05rem, 1.25vw, 1.22rem); line-height: 1.75; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 40px; }
.button { min-height: 64px; display: inline-flex; align-items: center; justify-content: center; padding: 0 34px; text-decoration: none; text-transform: uppercase; letter-spacing: .12em; font-size: .8rem; font-weight: 800; border: 1px solid rgba(223,181,86,.72); transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #061820; background: linear-gradient(135deg, #f2d37f, #c99435); }
.button-secondary { background: rgba(2,18,24,.35); }
.button-secondary:hover { background: rgba(223,181,86,.09); }
.hero-visual { margin: 0; display: flex; flex-direction: column; align-items: center; justify-content: center; overflow: visible; }
.hero-visual img {
  width: min(100%, 620px);
  max-height: 58svh;
  object-fit: contain;
  filter: drop-shadow(0 30px 60px rgba(0,0,0,.45));
}
.hero-logo-visual {
  min-height: 430px;
}
.hero-logo-visual img {
  width: min(100%, 620px);
  height: auto;
  transform: scale(2);
  transform-origin: center center;
}

.section { padding: 100px max(24px, calc((100vw - 1180px) / 2)); }
.section-heading { max-width: 860px; }
.section-heading.compact { max-width: 1000px; }
.section h2 { margin: 0 0 24px; font-family: Georgia, 'Times New Roman', serif; font-size: clamp(2.5rem, 5vw, 5rem); font-weight: 400; line-height: 1.03; }
.section-heading > p:last-child { color: var(--muted); font-size: 1.12rem; line-height: 1.8; }

.universe { background: var(--navy); }
.feature-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; margin-top: 44px; }
.feature-grid article { position: relative; min-height: 235px; padding: 34px; border: 1px solid var(--line); background: linear-gradient(145deg, rgba(255,255,255,.035), rgba(255,255,255,.012)); }
.feature-grid article > span { color: rgba(242,211,127,.45); font-family: Georgia, serif; font-size: 2rem; }
.feature-grid h3 { margin: 16px 0 13px; color: var(--gold-light); font-family: Georgia, 'Times New Roman', serif; font-size: 1.4rem; font-weight: 400; }
.feature-grid p, .universe-note { color: var(--muted); line-height: 1.72; }
.universe-note { max-width: 930px; margin: 34px 0 0; padding: 20px 0 20px 24px; border-left: 2px solid var(--gold); }

.advantages { background: var(--navy-soft); }
.advantage-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 40px; }
.advantage-grid article { min-height: 180px; padding: 28px; border: 1px solid var(--line); background: rgba(255,255,255,.024); }
.advantage-grid h3 { margin: 0 0 14px; color: var(--gold-light); font-family: Georgia, serif; font-size: 1.35rem; font-weight: 400; }
.advantage-grid p { margin: 0; color: var(--muted); line-height: 1.65; }

.gallery-section { background: #031922; }
.gallery-grid { display: grid; grid-template-columns: 1.2fr 1fr 1fr; grid-auto-rows: 245px; gap: 16px; margin-top: 42px; }
.gallery-item { position: relative; min-width: 0; overflow: hidden; padding: 0; border: 1px solid var(--line); background: #061b24; cursor: zoom-in; }
.gallery-wide { grid-column: span 2; }
.gallery-tall { grid-row: span 2; }
.gallery-item img { display: block; width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease, filter .5s ease; }
.gallery-item::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to top, rgba(1,14,19,.92), transparent 58%); }
.gallery-item span { position: absolute; z-index: 1; left: 20px; right: 18px; bottom: 17px; color: var(--gold-light); font-family: Georgia, serif; font-size: 1.12rem; text-align: left; }
.gallery-item:hover img, .gallery-item:focus-visible img { transform: scale(1.045); filter: brightness(1.08); }
.gallery-item:focus-visible { outline: 3px solid var(--gold); outline-offset: 3px; }

.contact { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 50px; background: linear-gradient(135deg, #061f28, #031922); border-top: 1px solid rgba(223,181,86,.18); }
.contact h2 { margin-bottom: 18px; }
.contact p:not(.eyebrow) { max-width: 720px; color: var(--muted); line-height: 1.75; }
.contact-actions { display: flex; flex-direction: column; gap: 12px; align-items: stretch; }
.contact-phone, .contact-email { white-space: nowrap; padding: 18px 26px; text-decoration: none; font-weight: 800; letter-spacing: .04em; text-align: center; }
.contact-phone { color: #061820; background: linear-gradient(135deg, #f2d37f, #c99435); }
.contact-email { color: #f2d37f; border: 1px solid rgba(242,211,127,.75); background: rgba(255,255,255,.025); }
.contact-surfaces {
  margin-top: 18px;
  color: var(--gold-light) !important;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

footer { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 30px; padding: 34px clamp(24px, 5vw, 70px); background: var(--navy-deep); border-top: 1px solid rgba(255,255,255,.07); }
footer img { width: 150px; }
footer p { color: #aebdc0; text-align: center; }
footer a { color: var(--gold-light); text-decoration: none; }

.lightbox { position: fixed; inset: 0; z-index: 1000; display: none; align-items: center; justify-content: center; padding: 28px 80px; background: rgba(0,8,12,.95); backdrop-filter: blur(9px); }
.lightbox.open { display: flex; }
.lightbox-image { max-width: min(1250px, 88vw); max-height: 88vh; object-fit: contain; border: 1px solid rgba(223,181,86,.45); box-shadow: 0 30px 90px rgba(0,0,0,.6); }
.lightbox-close, .lightbox-nav { position: fixed; border: 1px solid rgba(223,181,86,.55); background: rgba(3,25,34,.85); color: var(--cream); cursor: pointer; }
.lightbox-close { top: 18px; right: 22px; width: 50px; height: 50px; font-size: 2rem; }
.lightbox-nav { top: 50%; width: 54px; height: 70px; transform: translateY(-50%); font-size: 2.4rem; }
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

@media (max-width: 1020px) {
  .site-header { grid-template-columns: auto 1fr; }
  .header-project { display: none; }
  .hero { grid-template-columns: 1fr; text-align: center; padding-top: 225px; }
  .hero-text { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual img { width: min(78vw, 620px); max-height: 50svh; }
  .advantage-grid { grid-template-columns: repeat(2, 1fr); }
  .contact { grid-template-columns: 1fr; text-align: center; }
  .contact p:not(.eyebrow) { margin-left: auto; margin-right: auto; }
}

@media (max-width: 760px) {
  .site-header { position: absolute; grid-template-columns: 1fr auto; gap: 12px; min-height: 124px; padding: 8px 18px; background: rgba(2,20,28,.9); }
  .brand img { width: 300px; height: 128px; object-fit: contain; transform: scale(2); transform-origin: left center; }
  .menu-toggle { display: block; padding: 10px 12px; color: var(--gold-light); background: transparent; border: 1px solid var(--line); }
  .main-nav { grid-column: 1 / -1; display: none; flex-direction: column; align-items: center; gap: 0; padding: 8px 0 4px; }
  .main-nav.open { display: flex; }
  .main-nav a { width: 100%; padding: 13px; text-align: center; border-top: 1px solid rgba(255,255,255,.06); }
  .hero { min-height: 100svh; padding: 178px 22px 78px; }
  .hero h1 { font-size: clamp(3.15rem, 14vw, 5.2rem); }
  .hero-actions { flex-direction: column; }
  .button { width: 100%; }
  .section { padding: 72px 22px; }
  .feature-grid, .advantage-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: auto; padding: 26px; }
  .gallery-grid { grid-template-columns: 1fr; grid-auto-rows: 260px; }
  .gallery-wide, .gallery-tall { grid-column: auto; grid-row: auto; }
  footer { grid-template-columns: 1fr; justify-items: center; text-align: center; }
  .lightbox { padding: 72px 16px 22px; }
  .lightbox-nav { display: none; }
}

@media (max-width: 1180px) and (min-width: 761px) {
  .brand img { width: 330px; height: 145px; object-fit: contain; transform: scale(2); transform-origin: left center; }
  .site-header { min-height: 150px; }
  .hero { padding-top: 205px; }
}
@media (max-width: 520px) {
  .brand img { width: 230px; height: 98px; object-fit: contain; transform: scale(2); transform-origin: left center; }
  .site-header { min-height: 104px; }
  .hero { padding-top: 150px; }
  .hero-logo-visual { min-height: 280px; }
}

/* Protection dissuasive contre la copie directe des visuels */
img,
.gallery-item,
.hero-visual,
.lightbox-image {
  -webkit-user-drag: none;
  user-drag: none;
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;
}

/* Sélecteur de langue */
.site-header { grid-template-columns: auto 1fr auto auto; }
.language-switcher { position: relative; justify-self: end; z-index: 30; }
.language-button {
  min-width: 62px;
  padding: 12px 14px;
  color: var(--gold-light);
  background: rgba(3,25,34,.88);
  border: 1px solid var(--line);
  font: inherit;
  font-weight: 800;
  letter-spacing: .08em;
  cursor: pointer;
}
.language-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  display: none;
  min-width: 170px;
  padding: 8px;
  background: rgba(2,20,28,.98);
  border: 1px solid var(--line);
  box-shadow: 0 18px 45px rgba(0,0,0,.4);
}
.language-menu.open { display: grid; }
.language-option {
  width: 100%;
  padding: 11px 13px;
  color: var(--cream);
  background: transparent;
  border: 0;
  text-align: left;
  font: inherit;
  cursor: pointer;
}
.language-option:hover,
.language-option.active { color: var(--gold-light); background: rgba(242,211,127,.1); }
html[lang="ko"] body { word-break: keep-all; }
html[lang="ru"] .hero h1,
html[lang="ko"] .hero h1 { font-size: clamp(3.2rem, 6vw, 6.5rem); }
@media (max-width: 1020px) {
  .site-header { grid-template-columns: auto 1fr auto; }
  .language-switcher { grid-column: 3; grid-row: 1; }
}
@media (max-width: 760px) {
  .site-header { grid-template-columns: 1fr auto auto; }
  .language-switcher { grid-column: 2; grid-row: 1; }
  .menu-toggle { grid-column: 3; grid-row: 1; }
  .main-nav { grid-column: 1 / -1; }
  .language-button { min-width: 54px; padding: 10px; }
}


/* SEO service pages and content */
.seo-services{background:linear-gradient(180deg,rgba(3,25,34,.96),rgba(5,36,47,.96));}
.seo-service-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1rem;margin-top:2rem;}
.seo-service-grid article{padding:1.5rem;border:1px solid rgba(211,168,82,.25);background:rgba(255,255,255,.035);border-radius:18px;}
.seo-service-grid h3{margin-top:0;color:#f1d08a;}
.seo-service-grid a,.footer-seo-links a{color:#e1bd6c;text-decoration:none;font-weight:700;}
.seo-service-grid a:hover,.footer-seo-links a:hover{text-decoration:underline;}
.faq-list{max-width:980px;margin:2rem auto 0;display:grid;gap:.8rem;}
.faq-list details{border:1px solid rgba(211,168,82,.25);border-radius:14px;padding:1rem 1.2rem;background:rgba(255,255,255,.035);}
.faq-list summary{cursor:pointer;font-weight:700;color:#f1d08a;}
.faq-list p{margin:.8rem 0 0;line-height:1.75;}
.footer-seo-links{max-width:900px;text-align:center;line-height:1.9;}
.service-page{min-height:100vh;background:#031922;color:#f5f1e8;}
.service-page main{max-width:1120px;margin:0 auto;padding:7rem 1.25rem 4rem;}
.service-hero{display:grid;grid-template-columns:1.1fr .9fr;gap:3rem;align-items:center;margin-bottom:4rem;}
.service-hero h1{font-size:clamp(2.4rem,6vw,5rem);line-height:1.02;margin:.5rem 0 1.25rem;}
.service-hero img{width:100%;height:auto;border-radius:24px;box-shadow:0 20px 60px rgba(0,0,0,.35);}
.service-content{display:grid;grid-template-columns:1fr 1fr;gap:2rem;}
.service-card{padding:1.5rem;border:1px solid rgba(211,168,82,.25);border-radius:18px;background:rgba(255,255,255,.035);}
.service-card h2,.service-card h3{color:#f1d08a;}
.service-breadcrumbs{font-size:.9rem;margin-bottom:1.5rem;}
.service-breadcrumbs a{color:#e1bd6c;text-decoration:none;}
.service-cta{margin-top:3rem;padding:2rem;border-radius:20px;background:linear-gradient(135deg,#d6ad5f,#946d26);color:#061820;display:flex;justify-content:space-between;align-items:center;gap:1rem;}
.service-cta a{color:#061820;font-weight:800;}
@media(max-width:900px){.seo-service-grid{grid-template-columns:1fr 1fr}.service-hero,.service-content{grid-template-columns:1fr}.service-page main{padding-top:6rem}}
@media(max-width:600px){.seo-service-grid{grid-template-columns:1fr}.service-cta{display:block}.service-cta a{display:inline-block;margin-top:1rem}}


/* Single-page SEO expertise section */
.expertise-section{background:linear-gradient(180deg,rgba(4,28,37,.98),rgba(3,21,29,.98));}
.expertise-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1rem;max-width:1180px;margin:2rem auto 0;}
.expertise-grid article{padding:1.5rem;border:1px solid rgba(203,169,101,.24);background:rgba(255,255,255,.025);border-radius:18px;}
.expertise-grid h3{margin:0 0 .65rem;color:#d8bd7c;font-size:1.14rem;}
.expertise-grid p{margin:0;color:rgba(255,255,255,.76);line-height:1.75;}
@media(max-width:720px){.expertise-grid{grid-template-columns:1fr;}}

/* Accessibilité et navigation SEO */
.skip-link{position:fixed;left:1rem;top:-5rem;z-index:9999;background:#fff;color:#031922;padding:.75rem 1rem;border-radius:.35rem;font-weight:700}.skip-link:focus{top:1rem}a:focus-visible,button:focus-visible{outline:3px solid currentColor;outline-offset:4px}

/* Pied de page compact et stable */
.site-footer {
  display: block;
  width: 100%;
  max-width: 100%;
  overflow: hidden;
  padding: 26px clamp(20px, 5vw, 70px) 18px;
  background: var(--navy-deep);
  border-top: 1px solid rgba(255,255,255,.07);
}
.footer-main {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr) auto;
  align-items: center;
  gap: 28px;
  width: min(1180px, 100%);
  margin: 0 auto;
}
.footer-main img {
  display: block;
  width: 150px;
  max-width: 100%;
  height: auto;
  object-fit: contain;
  transform: none;
}
.footer-main p {
  margin: 0;
  color: #aebdc0;
  text-align: center;
  line-height: 1.5;
}
.footer-phone {
  color: var(--gold-light);
  text-decoration: none;
  font-weight: 700;
  white-space: nowrap;
}
.footer-seo-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  width: min(1000px, 100%);
  max-width: none;
  margin: 18px auto 0;
  padding-top: 16px;
  border-top: 1px solid rgba(255,255,255,.06);
  text-align: center;
  line-height: 1.5;
}
.footer-seo-links a {
  color: #c6a85e;
  text-decoration: none;
  font-size: .9rem;
  font-weight: 700;
}
.footer-seo-links span { color: rgba(255,255,255,.28); }
.footer-seo-links a:hover { text-decoration: underline; }
@media (max-width: 760px) {
  .site-footer { padding: 24px 20px 18px; }
  .footer-main {
    grid-template-columns: 1fr;
    justify-items: center;
    gap: 12px;
    text-align: center;
  }
  .footer-main img { width: 135px; }
  .footer-seo-links { gap: 6px 9px; }
}