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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  color: #1e293b;
  background: #fefdf8;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection {
  background: #99f6e4;
  color: #134e4a;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ── Scroll-triggered animations ────────────────────────── */
.fade-up {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
}

.fade-up.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-up.delay-1 { transition-delay: 0.1s; }
.fade-up.delay-2 { transition-delay: 0.2s; }
.fade-up.delay-3 { transition-delay: 0.3s; }

/* ── Card hover ──────────────────────────────────────────── */
.card-elevate {
  transform: translateY(0);
  transition: transform 0.35s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

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

/* ── Header scroll state ─────────────────────────────────── */
#site-header.scrolled {
  background: rgba(254, 253, 248, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06), 0 4px 20px rgba(0, 0, 0, 0.04);
}

#site-header.scrolled .nav-link {
  color: #475569;
}

#site-header.scrolled .nav-link:hover {
  color: #0d9488;
}

/* ── Mobile menu ─────────────────────────────────────────── */
.mobile-link {
  position: relative;
}

.mobile-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 0;
  width: 0;
  height: 2px;
  background: #0d9488;
  transition: width 0.25s ease;
}

.mobile-link:hover::after {
  width: 60%;
}

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

/* ── Focus visible ───────────────────────────────────────── */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid #14b8a6;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ── Subtle entrance for hero elements ───────────────────── */
@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-anim {
  animation: heroFadeUp 0.8s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.hero-anim.delay-1 { animation-delay: 0.15s; }
.hero-anim.delay-2 { animation-delay: 0.3s; }
.hero-anim.delay-3 { animation-delay: 0.45s; }

/* ── Responsive tweaks ───────────────────────────────────── */
@media (max-width: 640px) {
  .font-serif {
    word-spacing: -0.02em;
  }

  #site-header {
    background: rgba(254, 253, 248, 0.95);
    backdrop-filter: blur(12px);
  }
}