/**
 * Site-wide motion — scroll reveal, hovers, back-to-top
 */

:root {
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-spring: cubic-bezier(0.34, 1.2, 0.64, 1);
  --motion-duration: 0.55s;
  --motion-distance: 28px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-clearance, 120px);
}

/* ── Scroll reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(var(--motion-distance));
  transition:
    opacity var(--motion-duration) var(--ease-out),
    transform var(--motion-duration) var(--ease-out);
  transition-delay: var(--reveal-delay, 0s);
  will-change: opacity, transform;
}

.reveal--fade {
  transform: none;
}

.reveal--fade-left {
  transform: translateX(calc(var(--motion-distance) * -1));
}

.reveal--fade-right {
  transform: translateX(var(--motion-distance));
}

.reveal--scale {
  transform: scale(0.96);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

.reveal-stagger > .reveal:nth-child(1) { --reveal-delay: 0s; }
.reveal-stagger > .reveal:nth-child(2) { --reveal-delay: 0.07s; }
.reveal-stagger > .reveal:nth-child(3) { --reveal-delay: 0.14s; }
.reveal-stagger > .reveal:nth-child(4) { --reveal-delay: 0.21s; }
.reveal-stagger > .reveal:nth-child(5) { --reveal-delay: 0.28s; }
.reveal-stagger > .reveal:nth-child(6) { --reveal-delay: 0.35s; }
.reveal-stagger > .reveal:nth-child(7) { --reveal-delay: 0.42s; }

/* Hero entrance (runs once on load) */
.hero-content,
.hero .quote-form {
  animation: hero-enter var(--motion-duration) var(--ease-out) both;
}

.hero .quote-form {
  animation-delay: 0.12s;
}

@keyframes hero-enter {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* Interactive polish */
.btn,
.btn-consultation,
.nav-links a,
.service-card,
.stat-card,
.tool-card,
.why-card,
.quote-form,
.nav-toggle,
.back-to-top {
  transition:
    transform 0.25s var(--ease-out),
    opacity 0.25s ease,
    box-shadow 0.25s var(--ease-out),
    background-color 0.25s ease,
    border-color 0.25s ease;
}

.service-card:hover,
.stat-card:hover,
.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(5, 28, 44, 0.12);
}

.service-card:active,
.stat-card:active,
.tool-card:active {
  transform: translateY(-1px);
}

.quote-form:focus-within {
  box-shadow: 0 12px 40px rgba(5, 28, 44, 0.14);
}

.field input:focus,
.field textarea:focus {
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

/* Header subtle fade-in */
.site-header {
  animation: header-enter 0.45s var(--ease-out) both;
}

@keyframes header-enter {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: max(16px, env(safe-area-inset-right, 16px));
  bottom: max(20px, env(safe-area-inset-bottom, 20px));
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--red);
  color: var(--white);
  box-shadow: 0 6px 24px rgba(234, 42, 66, 0.45);
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px) scale(0.9);
  pointer-events: none;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}

.back-to-top:hover {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 10px 28px rgba(234, 42, 66, 0.5);
}

.back-to-top:active {
  transform: translateY(0) scale(0.98);
}

.back-to-top svg {
  width: 22px;
  height: 22px;
  fill: currentColor;
}

.toast.show {
  animation: toast-pop 0.35s var(--ease-spring) both;
}

@keyframes toast-pop {
  from {
    opacity: 0;
    transform: translateY(100px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .back-to-top {
    transition: opacity 0.2s ease, visibility 0.2s ease;
  }
}