/* ── Base & Reset ── */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body { margin: 0; min-height: 100vh; }
img, svg { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; font: inherit; }
a { color: inherit; text-decoration: none; }

/* ── Focus Styles ── */
:focus-visible { outline: 2px solid #0d9488; outline-offset: 2px; border-radius: 4px; }

/* ── Navbar ── */
#navbar {
  background: transparent;
  transition: background 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}
#navbar.scrolled {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}
.nav-link { position: relative; }
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: #0d9488;
  transition: width 0.3s ease;
}
.nav-link:hover::after,
.nav-link:focus::after { width: 100%; }

/* ── Mobile Menu ── */
#mobile-menu.open { opacity: 1 !important; pointer-events: all !important; }
#menu-btn[aria-expanded="true"] #bar1 { transform: translateY(2px) rotate(45deg); }
#menu-btn[aria-expanded="true"] #bar2 { opacity: 0; }
#menu-btn[aria-expanded="true"] #bar3 { transform: translateY(-2px) rotate(-45deg); }
.mobile-link { transition: opacity 0.3s ease, transform 0.3s ease; }

/* ── Hero Cards ── */
.hero-card {
  opacity: 0;
  transform: translateX(30px);
  animation: cardSlideIn 0.7s ease forwards;
}
.card-1 { animation-delay: 0.3s; }
.card-2 { animation-delay: 0.5s; }
.card-3 { animation-delay: 0.7s; }
.card-4 { animation-delay: 0.9s; }

@keyframes cardSlideIn {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ── Scroll Reveal ── */
.reveal-up, .reveal-left {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: no-preference) {
  .reveal-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
  }
  .reveal-up.revealed,
  .reveal-left.revealed {
    opacity: 1;
    transform: translateY(0) translateX(0);
  }
}

/* ── Back to Top ── */
#back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: all;
}

/* ── Selection ── */
::selection {
  background: #0d9488;
  color: #fff;
}

/* ── Smooth Scroll Offset ── */
section[id] {
  scroll-margin-top: 80px;
}

/* ── Reduced Motion ── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .hero-card {
    opacity: 1;
    transform: none;
  }
}

/* ── Print ── */
@media print {
  #navbar, #back-to-top, .reveal-up, .reveal-left { display: none; }
  body { color: #000; background: #fff; }
}