:root {
  --bg: #ffffff;
  --bg-alt: #f7f6f3;
  --bg-card: #ffffff;
  --gold: #b8863f;
  --gold-light: #9c6f2e;
  --text: #1c1c1e;
  --text-muted: #5a5a5f;
  --border: #e3e0da;
  --max-width: 1200px;
  --radius: 4px;
  --transition: 0.3s ease;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  font-size: 16px;
}

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

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 100px 0; }

.section-heading {
  font-size: 2.2rem;
  font-weight: 300;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 48px;
  text-align: center;
  position: relative;
}

.section-heading::after {
  content: "";
  display: block;
  width: 60px;
  height: 2px;
  background: var(--gold);
  margin: 16px auto 0;
}

/* Header / Nav */
header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  letter-spacing: 3px;
  font-size: 1.1rem;
}

.nav-logo img { height: 40px; width: auto; }

nav.nav-links {
  display: flex;
  gap: 32px;
}

nav.nav-links a {
  font-size: 0.85rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-muted);
  transition: color var(--transition);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}

nav.nav-links a:hover,
nav.nav-links a.active {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.lang-switch {
  display: flex;
  gap: 6px;
}

.lang-switch button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.75rem;
  letter-spacing: 1px;
  padding: 5px 10px;
  cursor: pointer;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.lang-switch button.active,
.lang-switch button:hover {
  color: var(--gold-light);
  border-color: var(--gold);
}

.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.burger span {
  width: 24px;
  height: 2px;
  background: var(--text);
}

/* Hero */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background:
    linear-gradient(180deg, rgba(255,255,255,0.5), rgba(255,255,255,0.95)),
    radial-gradient(circle at 50% 20%, #f2efe8 0%, #ffffff 70%);
  padding: 0 24px;
}

.hero-logo {
  width: 140px;
  margin-bottom: 32px;
  filter: drop-shadow(0 0 20px rgba(184,134,63,0.12));
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: 200;
  letter-spacing: 10px;
  color: var(--text);
}

.hero p {
  margin-top: 16px;
  font-size: 1.1rem;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--gold-light);
}

.hero-cta {
  margin-top: 40px;
  display: inline-block;
  border: 1px solid var(--gold);
  color: var(--gold-light);
  padding: 14px 40px;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 0.85rem;
  border-radius: var(--radius);
  transition: all var(--transition);
}

.hero-cta:hover {
  background: var(--gold);
  color: #ffffff;
}

/* About */
#about { background: var(--bg-alt); }

.about-text {
  max-width: 780px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--text-muted);
  text-align: left;
}

.about-text strong { color: var(--gold-light); font-weight: 600; }

/* Services */
.services-intro {
  max-width: 800px;
  margin: 0 auto 56px;
  text-align: center;
  color: var(--text-muted);
  font-size: 1.05rem;
}

.services-intro strong { color: var(--gold-light); }

.services-columns {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.services-columns h3 {
  font-size: 1.1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--gold-light);
  margin-bottom: 20px;
  font-weight: 500;
}

.services-columns ul { list-style: none; }

.services-columns li {
  padding: 10px 0 10px 24px;
  border-bottom: 1px solid var(--border);
  position: relative;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.services-columns li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 8px;
  background: var(--gold);
  border-radius: 50%;
}

.services-outro {
  max-width: 800px;
  margin: 0 auto;
  color: var(--text-muted);
  text-align: center;
  font-size: 0.95rem;
}

/* Reference */
#reference { background: var(--bg-alt); }

.ref-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.ref-filters button {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 8px 18px;
  font-size: 0.8rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
}

.ref-filters button.active,
.ref-filters button:hover {
  border-color: var(--gold);
  color: var(--gold-light);
}

.ref-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 16px;
}

.ref-item {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid var(--border);
  background: var(--bg-card);
}

.ref-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.ref-item:hover img { transform: scale(1.08); }

.ref-item .ref-label {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  padding: 8px 10px;
  font-size: 0.75rem;
  background: linear-gradient(to top, rgba(0,0,0,0.85), transparent);
  color: var(--text);
}

.ref-item .ref-count {
  position: absolute;
  top: 8px; right: 8px;
  background: rgba(0,0,0,0.6);
  color: var(--gold-light);
  font-size: 0.7rem;
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid var(--gold);
}

/* Partners */
.partners-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 14px 24px;
}

.partners-grid div {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  letter-spacing: 0.5px;
}

/* Certificates */
#certificates { background: var(--bg-alt); }

.cert-grid {
  display: flex;
  gap: 24px;
  justify-content: center;
  flex-wrap: wrap;
}

.cert-item {
  width: 220px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-card);
}

.cert-item img { width: 100%; }

.cert-item .ref-label {
  padding: 10px;
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Contact */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  max-width: 900px;
  margin: 0 auto;
}

.contact-block h3 {
  color: var(--gold-light);
  font-size: 1rem;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.contact-block p { color: var(--text-muted); margin-bottom: 6px; }

.contact-block a { color: var(--text); border-bottom: 1px dotted var(--border); }
.contact-block a:hover { color: var(--gold-light); }

/* Footer */
footer {
  text-align: center;
  padding: 40px 24px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border);
  letter-spacing: 1px;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(5,5,6,0.96);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  flex-direction: column;
  padding: 24px;
}

.lightbox.open { display: flex; }

.lightbox img {
  max-width: 90vw;
  max-height: 75vh;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.15);
}

.lightbox-caption {
  color: var(--text);
  margin-top: 16px;
  font-size: 0.95rem;
  letter-spacing: 1px;
}

.lightbox-close {
  position: absolute;
  top: 24px;
  right: 32px;
  background: none;
  border: none;
  color: var(--text);
  font-size: 2rem;
  cursor: pointer;
  line-height: 1;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: none;
  border: none;
  color: var(--gold-light);
  font-size: 2.5rem;
  cursor: pointer;
  padding: 12px;
}

.lightbox-prev { left: 12px; }
.lightbox-next { right: 12px; }

/* Mobile */
@media (max-width: 860px) {
  .services-columns,
  .contact-grid { grid-template-columns: 1fr; }

  nav.nav-links {
    position: fixed;
    top: 76px;
    left: 0;
    right: 0;
    background: var(--bg);
    flex-direction: column;
    padding: 24px;
    gap: 20px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-150%);
    transition: transform var(--transition);
  }

  nav.nav-links.open { transform: translateY(0); }

  .burger { display: flex; }

  section { padding: 64px 0; }
}