/* ============================================================
   CourserTech — Animations (kept intentionally simple:
   fades + gentle slides, like lk-ea.com — no heavy motion)
   ============================================================ */

/* ---------- Scroll reveal (fade up) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity var(--dur-reveal) var(--ease-reveal),
    transform var(--dur-reveal) var(--ease-reveal);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}
[data-reveal="fade"] { transform: none; }
[data-reveal="left"] { transform: translateX(-24px); }
[data-reveal="right"] { transform: translateX(24px); }
[data-reveal="zoom"] { transform: scale(0.97); }

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* If JS is disabled, content must stay visible */
.no-js [data-reveal] { opacity: 1; transform: none; }

/* ---------- Hero slider (cross-fade) ---------- */
.hero-slider .slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 1s ease;
  pointer-events: none;
}
.hero-slider .slide.is-active {
  opacity: 1;
  pointer-events: auto;
}
.hero-slider .slide .slide-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.02);
}
.hero-slider .slide.is-active .slide-bg {
  animation: hero-breathe 7s ease forwards;
}
@keyframes hero-breathe {
  from { transform: scale(1.02); }
  to   { transform: scale(1.07); }
}

.hero-slider .slide .slide-inner {
  position: relative;
  z-index: 2;
  height: 100%;
  display: flex;
  align-items: center;
}
.slide-content {
  max-width: 640px;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.8s ease 0.25s, transform 0.8s ease 0.25s;
}
.hero-slider .slide.is-active .slide-content {
  opacity: 1;
  transform: none;
}

/* Slider controls */
.hero-dots {
  position: absolute;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  display: flex;
  gap: 9px;
  z-index: 5;
}
.hero-dots button {
  width: 26px;
  height: 4px;
  border-radius: 4px;
  background: rgba(255, 255, 255, 0.35);
  transition: background var(--transition), width var(--transition);
}
.hero-dots button.is-active {
  background: var(--c-accent);
  width: 40px;
}
.hero-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 5;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.12);
  color: var(--c-white);
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: background var(--transition);
}
.hero-nav:hover { background: var(--c-primary); }
.hero-nav svg { width: 20px; height: 20px; }
.hero-nav.prev { left: 22px; }
.hero-nav.next { right: 22px; }

/* ---------- Keyframes ---------- */
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0.55); }
  70%  { box-shadow: 0 0 0 8px rgba(74, 222, 128, 0); }
  100% { box-shadow: 0 0 0 0 rgba(74, 222, 128, 0); }
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Marquee for partner strip (slow, subtle) */
.marquee {
  overflow: hidden;
  position: relative;
}
.marquee-track {
  display: flex;
  gap: 24px;
  width: max-content;
  animation: marquee 30s linear infinite;
}
.marquee:hover .marquee-track { animation-play-state: paused; }
@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ---------- Back to top ---------- */
.to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  z-index: 90;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--c-primary);
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity var(--transition), transform var(--transition),
              visibility var(--transition), background var(--transition);
}
.to-top.show {
  opacity: 1;
  visibility: visible;
  transform: none;
}
.to-top:hover { background: var(--c-primary-dark); }
.to-top svg { width: 20px; height: 20px; }

/* ---------- Loading spinner (forms) ---------- */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}