/* ========== BASE & RESET ========== */
*, *::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(13, 148, 136, 0.2);
  color: #0f766e;
}

/* ========== ANIMATIONS ========== */
@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  33% { transform: translateY(-20px) rotate(2deg); }
  66% { transform: translateY(10px) rotate(-1deg); }
}

@keyframes scroll-line {
  0% { opacity: 0; transform: scaleY(0); transform-origin: top; }
  50% { opacity: 1; transform: scaleY(1); transform-origin: top; }
  51% { transform-origin: bottom; }
  100% { opacity: 0; transform: scaleY(0); transform-origin: bottom; }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

/* ========== HERO ========== */
.hero-orb {
  animation: float 8s ease-in-out infinite;
}

.scroll-indicator {
  animation: fadeInUp 1s ease-out 1.5s both;
}

/* ========== SCROLL REVEAL ========== */
.scroll-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* ========== NAVIGATION ========== */
#site-header {
  transition: background-color 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

#site-header.scrolled {
  background-color: rgba(4, 47, 46, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06), 0 4px 30px rgba(0, 0, 0, 0.15);
}

.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: rgba(255, 255, 255, 0.6);
  transition: width 0.3s ease;
}

.nav-link:hover::after {
  width: 100%;
}

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

.mobile-link {
  opacity: 0;
  transform: translateY(15px);
  transition: opacity 0.3s ease, transform 0.3s ease, color 0.3s ease;
}

#mobile-menu.open .mobile-link {
  opacity: 1;
  transform: translateY(0);
}

#mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.1s; }
#mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.15s; }
#mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.2s; }
#mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.25s; }
#mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.3s; }

/* ========== SERVICE TAG ========== */
.service-tag {
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

/* ========== SERVICE CARDS ========== */
.service-card {
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.service-card:hover {
  transform: translateY(-4px);
}

/* ========== GALLERY ========== */
.gallery-item {
  cursor: pointer;
  position: relative;
}

.gallery-item::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(4, 47, 46, 0.3) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.4s ease;
  border-radius: inherit;
}

.gallery-item:hover::after {
  opacity: 1;
}

/* ========== TESTIMONIAL CARDS ========== */
.testimonial-card {
  transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1),
              background 0.3s ease;
}

.testimonial-card:hover {
  transform: translateY(-4px);
}

/* ========== BACK TO TOP ========== */
.back-to-top {
  transition: opacity 0.3s ease, transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
}

.back-to-top:hover {
  box-shadow: 0 4px 20px rgba(13, 148, 136, 0.4);
}

/* ========== INPUT FOCUS ========== */
input:focus,
select:focus,
textarea:focus {
  outline: none;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 767px) {
  .hero-orb {
    display: none;
  }

  #hero {
    min-height: 100svh;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .scroll-reveal {
    transition-delay: 0ms !important;
  }
}