/* Base */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  overflow-x: hidden;
}

::selection {
  background: rgba(47, 80, 79, 0.15);
  color: #1f3535;
}

/* Scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: #faf9f6;
}
::-webkit-scrollbar-thumb {
  background: #c5dbd6;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #97beba;
}

/* Navigation */
#nav {
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#nav.scrolled {
  background: rgba(250, 249, 246, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(47, 80, 79, 0.08);
}

/* Mobile menu */
#mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

#mobile-menu.close {
  opacity: 0;
  pointer-events: none;
}

/* Hamburger animation */
#menu-btn.active #bar1 {
  transform: translateY(5px) rotate(45deg);
}
#menu-btn.active #bar2 {
  opacity: 0;
}
#menu-btn.active #bar3 {
  transform: translateY(-5px) rotate(-45deg);
}

/* Service cards */
.service-card {
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 0;
  background: #3a6563;
  transition: height 0.4s ease;
}

.service-card:hover::before {
  height: 100%;
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }
.reveal-delay-6 { transition-delay: 0.6s; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .service-card::before {
    height: 100%;
  }
  * {
    transition: none !important;
    animation: none !important;
  }
}

/* Focus styles */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid #4a7f7d;
  outline-offset: 2px;
}

/* Image loading */
img {
  background-color: #ebe7db;
}