.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.875rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.2;
  text-align: center;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
  cursor: pointer;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-sm {
  padding: 0.7rem 1.1rem;
  font-size: 0.875rem;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-dark);
}

.btn-secondary {
  background: var(--color-dark);
  color: #fff;
}

.btn-secondary:hover {
  background: #000;
}

.btn-ghost {
  background: transparent;
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-ghost:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn-light {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.28);
  color: #fff;
  backdrop-filter: blur(8px);
}

.btn-light:hover {
  background: rgba(255, 255, 255, 0.2);
}

.btn-whatsapp {
  background: #25d366;
  color: #fff;
  border-color: transparent;
}

.btn-whatsapp:hover {
  background: #20bd5a;
}

.service-card,
.material-card,
.why-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.service-card:hover,
.material-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.service-card-image,
.material-card-image {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.service-card-image img,
.material-card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.service-card:hover .service-card-image img,
.material-card:hover .material-card-image img {
  transform: scale(1.05);
}

.service-card-body,
.material-card-body,
.why-card {
  padding: var(--space-lg);
}

.service-card h3,
.material-card h3,
.why-card h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 500;
}

.service-card p,
.material-card p,
.why-card p {
  margin-top: var(--space-sm);
  color: var(--color-text-muted);
}

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: var(--space-md);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-accent);
}

.card-link::after {
  content: "→";
  transition: transform var(--transition);
}

.service-card:hover .card-link::after,
.material-card:hover .card-link::after {
  transform: translateX(4px);
}

.form-group {
  display: grid;
  gap: 0.45rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(var(--color-accent-rgb), 0.15);
}

.form-group textarea {
  min-height: 9rem;
  resize: vertical;
}

.form-hp {
  position: absolute;
  left: -9999px;
  opacity: 0;
  pointer-events: none;
}

.form-alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
}

.form-alert.is-success {
  background: rgba(45, 106, 79, 0.1);
  color: var(--color-success);
}

.form-alert.is-error {
  background: rgba(180, 35, 24, 0.08);
  color: var(--color-error);
}

.filter-btn {
  padding: 0.55rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn.is-active,
.filter-btn:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(var(--color-accent-rgb), 0.08);
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  padding: var(--space-xl);
  background: rgba(20, 20, 20, 0.92);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.lightbox.is-open {
  opacity: 1;
  visibility: visible;
}

.lightbox-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  max-width: min(92vw, 1100px);
}

.lightbox img {
  max-width: min(92vw, 1100px);
  max-height: 80vh;
  border-radius: var(--radius-md);
}

.lightbox-counter {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.72);
}

.lightbox-close {
  position: absolute;
  top: var(--space-lg);
  right: var(--space-lg);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  cursor: pointer;
  transition: background var(--transition);
}

.lightbox-close svg {
  display: block;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.22);
}

.lightbox-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  transition: background var(--transition), border-color var(--transition);
}

.lightbox-nav:hover {
  background: rgba(255, 255, 255, 0.2);
  border-color: rgba(255, 255, 255, 0.4);
}

.lightbox-nav[hidden] {
  display: none;
}

@media (max-width: 767px) {
  .lightbox {
    flex-direction: column;
    justify-content: center;
    gap: var(--space-sm);
  }

  .lightbox-nav--prev,
  .lightbox-nav--next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
  }

  .lightbox-nav--prev {
    left: var(--space-md);
  }

  .lightbox-nav--next {
    right: var(--space-md);
  }

  .lightbox img {
    max-height: 70vh;
  }

  .home-hero__actions,
  .home-cta__actions,
  .svc-hero__actions,
  .about-visual__actions,
  .cta-inner .hero-actions {
    display: inline-flex;
    flex-direction: column;
    align-items: stretch;
    max-width: 100%;
  }

  .home-hero__actions .btn,
  .home-cta__actions .btn,
  .svc-hero__actions .btn,
  .about-visual__actions .btn,
  .cta-inner .hero-actions .btn {
    justify-content: center;
  }
}