/* ============================================================
   NEURPORT DESIGN SYSTEM v2 — Animations
   Scroll reveals, hover effects, page transitions.
   Progressive enhancement — site works without JS.
   ============================================================ */

/* ── Scroll Reveal ── */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered reveal for grid children */
[data-reveal-section] .card,
[data-reveal-section] .stat,
[data-reveal-section] .process-step {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-reveal-section].is-visible .card,
[data-reveal-section].is-visible .stat,
[data-reveal-section].is-visible .process-step {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay for grid items */
[data-reveal-section].is-visible .card:nth-child(1),
[data-reveal-section].is-visible .stat:nth-child(1),
[data-reveal-section].is-visible .process-step:nth-child(1) { transition-delay: 0ms; }
[data-reveal-section].is-visible .card:nth-child(2),
[data-reveal-section].is-visible .stat:nth-child(2),
[data-reveal-section].is-visible .process-step:nth-child(2) { transition-delay: 80ms; }
[data-reveal-section].is-visible .card:nth-child(3),
[data-reveal-section].is-visible .stat:nth-child(3),
[data-reveal-section].is-visible .process-step:nth-child(3) { transition-delay: 160ms; }
[data-reveal-section].is-visible .card:nth-child(4),
[data-reveal-section].is-visible .stat:nth-child(4),
[data-reveal-section].is-visible .process-step:nth-child(4) { transition-delay: 240ms; }
[data-reveal-section].is-visible .card:nth-child(5),
[data-reveal-section].is-visible .stat:nth-child(5) { transition-delay: 320ms; }
[data-reveal-section].is-visible .card:nth-child(6),
[data-reveal-section].is-visible .stat:nth-child(6) { transition-delay: 400ms; }

/* ── Hero entrance ── */
.hero h1 {
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}
.hero p {
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.15s both;
}
.hero .btn {
  animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.3s both;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── Card hover effects ── */
.card {
  transition: transform var(--transition-base),
              box-shadow var(--transition-base),
              border-color var(--transition-base);
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

/* Card icon bounce on hover */
.card:hover .card__icon {
  animation: iconBounce 0.4s ease;
}

@keyframes iconBounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

/* ── Button effects ── */
.btn {
  position: relative;
  overflow: hidden;
}

.btn::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.2);
  transform: translate(-50%, -50%);
  transition: width 0.4s ease, height 0.4s ease;
}

.btn:active::after {
  width: 200px;
  height: 200px;
}

/* ── Link underline animation ── */
.header__nav a {
  position: relative;
}

.header__nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: var(--space-3);
  right: var(--space-3);
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
  transform: scaleX(0);
  transition: transform var(--transition-base);
  transform-origin: center;
}

.header__nav a:hover::after {
  transform: scaleX(1);
}

/* ── Section title decoration ── */
.section__title {
  position: relative;
  display: inline-block;
  width: 100%;
}

.section__title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--color-primary);
  border-radius: 2px;
  margin: var(--space-4) auto 0;
}

/* ── Stat counter animation ── */
.stat__number {
  transition: color var(--transition-base);
}

.stat:hover .stat__number {
  color: var(--color-primary-dark);
}

.stat:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ── Language switcher transition ── */
.lang-switch button {
  transition: all var(--transition-fast);
}

/* ── Smooth page transitions ── */
body {
  animation: pageIn 0.3s ease;
}

@keyframes pageIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ── Scroll reveal observer (loaded by main.js) ── */
/* Fallback: if JS doesn't load, show everything */
@media (prefers-reduced-motion: reduce) {
  [data-reveal],
  [data-reveal-section] .card,
  [data-reveal-section] .stat,
  [data-reveal-section] .process-step {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  
  .hero h1,
  .hero p,
  .hero .btn {
    animation: none !important;
  }
}