/* ============================================================================
   KAISER – ANIMATION & INTERACTION LAYER
   Subtile, professionelle Animationen für die gesamte Website.
   Einbinden: <link rel="stylesheet" href="designs/animations.css">
              <script src="designs/animations.js" defer></script>
   ============================================================================ */

/* ---------- CSS CUSTOM PROPERTIES ---------- */
:root {
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 0.25s;
  --duration-base: 0.4s;
  --duration-slow: 0.6s;
}

/* ==========================================================================
   1. SCROLL-REVEAL SYSTEM  (driven by animations.js IntersectionObserver)
   Elements start invisible, get class .revealed when in viewport.
   ========================================================================== */

/* Base: hide before reveal */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  will-change: opacity, transform;
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Variant: slide from left */
.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  will-change: opacity, transform;
}
.reveal-left.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* Variant: slide from right */
.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  will-change: opacity, transform;
}
.reveal-right.revealed {
  opacity: 1;
  transform: translateX(0);
}

/* Variant: scale up */
.reveal-scale {
  opacity: 0;
  transform: scale(0.92);
  transition:
    opacity var(--duration-slow) var(--ease-out-expo),
    transform var(--duration-slow) var(--ease-out-expo);
  will-change: opacity, transform;
}
.reveal-scale.revealed {
  opacity: 1;
  transform: scale(1);
}

/* Stagger delays for child elements (set via JS data-delay or CSS) */
.reveal-stagger > .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger > .reveal:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger > .reveal:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger > .reveal:nth-child(4) { transition-delay: 240ms; }
.reveal-stagger > .reveal:nth-child(5) { transition-delay: 320ms; }
.reveal-stagger > .reveal:nth-child(6) { transition-delay: 400ms; }


/* ==========================================================================
   2. ENHANCED CARD HOVER EFFECTS
   ========================================================================== */

/* Override default card transitions for smoother feel */
.card {
  transition:
    box-shadow var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo),
    border-top-color var(--duration-base) ease;
}

.card:hover {
  box-shadow:
    0 16px 40px rgba(4, 35, 82, 0.12),
    0 2px 8px rgba(4, 35, 82, 0.06);
  transform: translateY(-6px);
  border-top-color: var(--cyan);
}

/* Card image zoom on hover */
.card .card-image {
  transition: transform 0.5s var(--ease-out-expo);
}
.card:hover .card-image {
  transform: scale(1.04);
}

/* Card content – subtle content lift */
.card .card-content .btn {
  transition:
    background-color var(--duration-fast) ease,
    transform var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease;
}
.card:hover .card-content .btn {
  transform: translateX(4px);
}


/* ==========================================================================
   3. VORTEIL-TILE HOVER ENHANCEMENTS
   ========================================================================== */

.vorteil-tile {
  transition:
    box-shadow var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo),
    border-left-color var(--duration-base) ease;
  position: relative;
  overflow: hidden;
}

.vorteil-tile::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 0;
  background: linear-gradient(180deg, var(--cyan), #0ea5e9);
  transition: height var(--duration-slow) var(--ease-out-expo);
  z-index: 1;
}

.vorteil-tile:hover::before {
  height: 100%;
}

.vorteil-tile:hover {
  box-shadow:
    0 8px 28px rgba(4, 35, 82, 0.1),
    0 2px 6px rgba(4, 35, 82, 0.04);
  transform: translateY(-4px);
}

.vorteil-tile .vorteil-icon {
  transition:
    background-color var(--duration-base) ease,
    transform var(--duration-base) var(--ease-out-back);
}
.vorteil-tile:hover .vorteil-icon {
  background: rgba(64, 192, 240, 0.22);
  transform: scale(1.1);
}


/* ==========================================================================
   4. STAT ITEMS – COUNTER & HOVER
   ========================================================================== */

.stat-item {
  transition:
    transform var(--duration-base) var(--ease-out-expo),
    box-shadow var(--duration-base) var(--ease-out-expo);
}

.stat-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(4, 35, 82, 0.08);
}

.stat-item .stat-number {
  transition: color var(--duration-base) ease;
}
.stat-item:hover .stat-number {
  color: var(--cyan);
}

/* Animated counter: numbers start at 0, JS counts up */
.stat-number[data-target] {
  font-variant-numeric: tabular-nums;
}


/* ==========================================================================
   5. SECTION LABEL – ANIMATED UNDERLINE
   ========================================================================== */

.section-label {
  position: relative;
  padding-bottom: 0.6rem;
}

.section-label::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.5s var(--ease-out-expo);
}

.revealed .section-label::after,
.visible .section-label::after,
section.fade-in.visible .section-label::after {
  width: 2.5rem;
}


/* ==========================================================================
   6. BUTTON MICRO-INTERACTIONS
   ========================================================================== */

.btn {
  position: relative;
  overflow: hidden;
  transition:
    background-color var(--duration-fast) ease,
    color var(--duration-fast) ease,
    transform var(--duration-fast) var(--ease-out-back),
    box-shadow var(--duration-base) var(--ease-out-expo);
}

/* Ripple-style shine effect on primary buttons */
.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.15) 50%,
    transparent 100%
  );
  transition: left 0.5s ease;
}

.btn-primary:hover::after {
  left: 100%;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(64, 192, 240, 0.25);
}

.btn:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(64, 192, 240, 0.15);
}


/* ==========================================================================
   7. QUOTE BLOCK – BORDER ANIMATION
   ========================================================================== */

.quote-block {
  border-left-color: transparent;
  position: relative;
  transition: border-left-color 0.01s;
}

.quote-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: -4px;
  width: 4px;
  height: 0;
  background: linear-gradient(180deg, var(--cyan), #0ea5e9);
  transition: height 0.6s var(--ease-out-expo) 0.2s;
  border-radius: 2px;
}

.revealed .quote-block::before,
.visible .quote-block::before,
section.fade-in.visible .quote-block::before {
  height: 100%;
}


/* ==========================================================================
   8. TEAM CARDS – IMAGE HOVER ZOOM + OVERLAY
   ========================================================================== */

.grid-4 .card {
  overflow: hidden;
}

.grid-4 .card .card-image {
  transition: transform 0.5s var(--ease-out-expo);
}

.grid-4 .card:hover .card-image {
  transform: scale(1.06);
}

/* Subtle contact link arrow animation */
.grid-4 .card .card-content a[href^="mailto"] {
  display: inline-block;
  transition: transform var(--duration-fast) ease, color var(--duration-fast) ease;
}

.grid-4 .card:hover .card-content a[href^="mailto"] {
  transform: translateX(4px);
  color: var(--cyan);
}


/* ==========================================================================
   9. TWO-COL IMAGE – REVEAL EFFECT
   ========================================================================== */

.two-col-right img {
  transition: transform 0.6s var(--ease-out-expo);
}

.two-col-right:hover img {
  transform: scale(1.02);
}


/* ==========================================================================
   10. HERO ENHANCEMENTS
   ========================================================================== */

/* Hero stats – stagger animation */
.hero-stats .stat {
  opacity: 0;
  transform: translateY(16px);
  animation: heroStatIn 0.5s var(--ease-out-expo) forwards;
}

.hero-stats .stat:nth-child(1) { animation-delay: 0.6s; }
.hero-stats .stat:nth-child(2) { animation-delay: 0.75s; }
.hero-stats .stat:nth-child(3) { animation-delay: 0.9s; }

@keyframes heroStatIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Hero CTA buttons – stagger */
.hero-cta .btn {
  opacity: 0;
  transform: translateY(12px);
  animation: heroStatIn 0.5s var(--ease-out-expo) forwards;
}
.hero-cta .btn:nth-child(1) { animation-delay: 0.4s; }
.hero-cta .btn:nth-child(2) { animation-delay: 0.55s; }

/* Subtle parallax-style depth on hero (handled more in JS) */
.hero-content {
  animation: heroContentIn 0.8s var(--ease-out-expo) forwards;
  opacity: 0;
}

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


/* ==========================================================================
   11. NAVIGATION ENHANCEMENTS
   ========================================================================== */

/* Smoother nav link underline */
.nav-item > a:not(.btn) {
  position: relative;
  border-bottom: none;
}

.nav-item > a:not(.btn)::before {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width var(--duration-base) var(--ease-out-expo), left var(--duration-base) var(--ease-out-expo);
}

.nav-item > a:not(.btn):hover::before,
.nav-item > a:not(.btn).active::before {
  width: 100%;
  left: 0;
}

/* Dropdown menu entry animation */
.nav-dropdown .dropdown-menu {
  transition:
    opacity var(--duration-base) var(--ease-out-expo),
    visibility var(--duration-base),
    transform var(--duration-base) var(--ease-out-expo);
}


/* ==========================================================================
   12. BRANCHEN TILES (geschaeftskunden.html)
   ========================================================================== */

/* Branchen image cards hover effect */
a[href*="branchen/"] .card,
.branchen-card {
  transition:
    box-shadow var(--duration-base) var(--ease-out-expo),
    transform var(--duration-base) var(--ease-out-expo);
}

a[href*="branchen/"]:hover .card,
.branchen-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(4, 35, 82, 0.14);
}


/* ==========================================================================
   13. FORM FOCUS ANIMATIONS
   ========================================================================== */

.form-group input,
.form-group textarea,
.form-group select {
  transition:
    border-color var(--duration-fast) ease,
    box-shadow var(--duration-fast) ease,
    transform var(--duration-fast) ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 3px rgba(64, 192, 240, 0.12), 0 2px 8px rgba(64, 192, 240, 0.08);
  transform: translateY(-1px);
}


/* ==========================================================================
   14. FOOTER LINK HOVER
   ========================================================================== */

.footer-section a {
  position: relative;
  transition: color var(--duration-fast) ease;
}

.footer-section a::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--cyan);
  transition: width var(--duration-base) var(--ease-out-expo);
}

.footer-section a:hover::after {
  width: 100%;
}

.footer-section a:hover {
  color: var(--cyan);
  opacity: 1;
}


/* ==========================================================================
   15. SOCIAL ICON HOVER
   ========================================================================== */

.social-icons a {
  transition:
    background-color var(--duration-base) ease,
    color var(--duration-fast) ease,
    transform var(--duration-fast) var(--ease-out-back);
}

.social-icons a:hover {
  transform: scale(1.12) translateY(-2px);
}


/* ==========================================================================
   16. HERO-SMALL (Subpage heroes) – text reveal
   ========================================================================== */

.hero-small .hero-content {
  animation: heroContentIn 0.7s var(--ease-out-expo) 0.1s forwards;
  opacity: 0;
}


/* ==========================================================================
   17. REDUCED MOTION – respect user preference
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
  }

  .reveal,
  .reveal-left,
  .reveal-right,
  .reveal-scale {
    opacity: 1;
    transform: none;
  }
}