:root {
  --ss-green: #1f6b3b;
  --ss-surface: #f4fbf6;
}

html,
body {
  scroll-behavior: smooth;
}

/* ── Navbar scroll transition ── */
#mainHeader {
  background: transparent;
  border-bottom: 1px solid transparent;
}

#mainHeader.header-scrolled {
  background: rgba(6, 78, 35, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: #15803d;
  box-shadow: 0 2px 16px rgba(31, 107, 59, 0.15);
}

#mainHeader.header-scrolled .nav-link {
  color: #fff;
}

#mainHeader.header-scrolled .nav-link:hover {
  color: #bbf7d0;
}

#mainHeader.header-scrolled .nav-btn-contact {
  background: #fff;
  border-color: #fff;
  color: #064e23;
}

#mainHeader.header-scrolled .nav-btn-contact:hover {
  background: #dcfce7;
}

#mainHeader.header-scrolled .nav-btn-signin {
  border-color: #fff;
  color: #fff;
}

#mainHeader.header-scrolled .nav-btn-signin:hover {
  background: rgba(255, 255, 255, 0.1);
}

#mainHeader.header-scrolled img.rounded-full {
  border-color: #bbf7d0;
}

.photo-marquee {
  background: linear-gradient(180deg, #f4fbf6 0%, #ecf8ef 100%);
  padding: 1rem 0;
}

.photo-track {
  display: flex;
  gap: 1.25rem;
  width: max-content;
  animation: photo-scroll 90s linear infinite;
  will-change: transform;
}

.photo-marquee:hover .photo-track {
  animation-play-state: paused;
}

.photo-card {
  flex: 0 0 clamp(260px, 34vw, 460px);
  aspect-ratio: 16 / 9;
  border-radius: 16px;
  overflow: hidden;
  box-shadow: 0 10px 24px rgba(20, 83, 45, 0.15);
  background: #fff;
}

.photo-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes photo-scroll {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-50%);
  }
}

@media (max-width: 768px) {
  .photo-track {
    animation-duration: 60s;
  }

  .photo-card {
    flex-basis: clamp(230px, 78vw, 360px);
  }
}

/* ── Mobile menu animations ── */
#mobileMenu {
  transition: max-height 0.3s ease, opacity 0.3s ease;
}

/* ── Auth modal responsive ── */
@media (max-width: 480px) {
  #authModal > div {
    margin: 0.5rem;
    max-height: 95vh;
    overflow-y: auto;
  }

  .photo-card {
    flex-basis: 85vw;
    border-radius: 10px;
  }

  .photo-track {
    gap: 0.75rem;
  }
}

/* ── Small phones ── */
@media (max-width: 360px) {
  .photo-card {
    flex-basis: 90vw;
  }
}