/* ══════════════════════════════════════════════════════════════
   REPULANCE – Animations & Scroll-Reveal
   ══════════════════════════════════════════════════════════════ */

/* ── Keyframes ──────────────────────────────────────────────── */
@keyframes riseIn {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 0 0 0 rgba(99,102,241,0);
  }
  50% {
    box-shadow: 0 0 20px 4px rgba(99,102,241,0.2);
  }
}

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}

@keyframes serpSlideDown {
  from {
    transform: translateY(0);
    opacity: 1;
  }
  to {
    transform: translateY(24px);
    opacity: 0.2;
  }
}

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

/* ── Scroll-reveal: initial hidden state ────────────────────── */
.reveal-up {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger delays via data-delay attribute (set in HTML) */
.reveal-up[data-delay="0"]   { transition-delay: 0ms; }
.reveal-up[data-delay="100"] { transition-delay: 100ms; }
.reveal-up[data-delay="150"] { transition-delay: 150ms; }
.reveal-up[data-delay="200"] { transition-delay: 200ms; }
.reveal-up[data-delay="300"] { transition-delay: 300ms; }
.reveal-up[data-delay="400"] { transition-delay: 400ms; }

/* ── Hero enters immediately (no wait for scroll) ───────────── */
.hero .hero-content.reveal-up {
  animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
  /* Override scroll-reveal for the hero */
  opacity: 1;
  transform: none;
}

/* SERP stage floats in slightly later */
.serp-stage {
  animation: fadeInUp 0.9s cubic-bezier(0.16, 1, 0.3, 1) 0.4s both,
             float 6s ease-in-out 2s infinite;
}

/* ── Stat numbers count-up visual cue ──────────────────────── */
.stat-num {
  transition: opacity 0.3s ease;
}

/* ── Service cards: icon pulse on hover ─────────────────────── */
.service-card:hover .service-icon-wrap {
  animation: pulse-glow 1.5s ease-in-out infinite;
}

/* ── CTA button shimmer ──────────────────────────────────────── */
.btn-primary {
  background: linear-gradient(
    135deg,
    var(--color-accent) 0%,
    var(--color-accent-light) 50%,
    var(--color-accent) 100%
  );
  background-size: 200% auto;
}

.btn-primary:hover {
  animation: shimmer 1.5s linear infinite;
}

/* ── Nav link active underline ──────────────────────────────── */
.nav-link {
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* ── Process step: number scale on scroll enter ─────────────── */
.process-step .step-number {
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.process-step.visible .step-number {
  animation: fadeInUp 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
}

/* ── FAQ expand animation ────────────────────────────────────── */
.faq-answer {
  overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
              opacity    0.25s ease;
  max-height: 0;
  opacity: 0;
}

.faq-answer:not([hidden]) {
  display: block;
  opacity: 1;
  max-height: 400px;
}

/* ── Hamburger open state ────────────────────────────────────── */
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.nav-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Testimonial card subtle border glow ────────────────────── */
.testimonial-card:hover {
  box-shadow: 0 0 24px rgba(99,102,241,0.08);
}

/* ── Value items: slide in from right ───────────────────────── */
.about-values .reveal-up {
  transition-delay: 150ms;
}