/* ═══════════════════════════════════════════════════
   PREMIUM HERO SECTION – EXPERTISE AREAS (v3.0)
   
   Premium responsive hero with:
   - Dynamically flexible grid system
   - Advanced hover animations
   - Parallax effects
   - Elegant transitions
   - 60 FPS optimization
   - Luxury brand aesthetic (Apple, Rolex)
   ══════════════════════════════════════════════════════ */

/* --- Expertise Section Layout --- */
.expertise-section {
  background-color: var(--color-gray-100);
  padding: var(--space-20) 0;
  border-bottom: 1px solid var(--color-gray-300);
  position: relative;
  overflow: hidden;
  /* Kompensiert die fixierte Navbar bei jedem Scroll zu dieser Section
     (Anchor-Link, JS scrollIntoView, Zurück-Navigation von Unterseiten) */
  scroll-margin-top: var(--nav-height);
}

.expertise-header {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--space-12);
  align-items: flex-end;
  margin-bottom: var(--space-12);
}

@media (max-width: 900px) {
  .expertise-header {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-8);
  }
}

.expertise-header__left {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.expertise-headline {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  font-weight: var(--fw-regular);
  line-height: var(--lh-tight);
  color: var(--color-near-black);
  margin-top: 0;
}

.expertise-intro {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-relaxed);
  color: var(--color-gray-600);
}

/* ═══════════════════════════════════════════════════
   PREMIUM HERO GRID – DYNAMIC & FLEXIBLE
   ══════════════════════════════════════════════════════ */

.premium-hero {
  display: flex;
  flex-direction: row;
  gap: var(--space-6);
  width: 100%;
  min-height: 540px;
}

@media (max-width: 768px) {
  .premium-hero {
    flex-direction: column;
    gap: var(--space-4);
    min-height: auto;
  }
}

/* ═══════════════════════════════════════════════════
   PREMIUM PANEL – BASE STYLES
   ══════════════════════════════════════════════════════ */

.premium-panel {
  position: relative;
  height: 520px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-10) var(--space-6);
  overflow: hidden;
  text-decoration: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex: 1;
  transition: flex 0.65s var(--ease-premium),
              box-shadow 0.65s var(--ease-premium),
              opacity 0.65s var(--ease-premium),
              height 0.5s var(--ease-premium),
              min-height 0.5s var(--ease-premium);
  box-shadow: var(--shadow-sm);
  border: 1px solid transparent;
  will-change: flex, box-shadow, transform, height;
}

@media (max-width: 1200px) {
  .premium-panel {
    height: 460px;
    padding: var(--space-8) var(--space-5);
  }
}

@media (max-width: 768px) {
  .premium-panel {
    height: 90px;
    min-height: 90px;
    padding: var(--space-4) var(--space-6);
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: var(--space-6);
  }
}

/* ═══════════════════════════════════════════════════
   PREMIUM PANEL – HOVER STATE (DESKTOP)
   ══════════════════════════════════════════════════════ */

@media (hover: hover) and (pointer: fine) {
  .premium-hero:hover .premium-panel {
    flex: 0.65;
    opacity: 0.65;
  }

  .premium-hero .premium-panel:hover {
    flex: 2.1;
    opacity: 1;
    box-shadow: var(--shadow-lg);
    z-index: 10;
  }

  /* Add green accent line on hover */
  .premium-panel:hover::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-green);
    z-index: 100;
    animation: accent-line 0.6s var(--ease-premium);
  }

  /* Title moves on hover */
  .premium-panel:hover .premium-panel__title {
    transform: translateY(-12px);
  }

  /* Description fades in */
  .premium-panel:hover .premium-panel__description {
    opacity: 1;
    max-height: 120px;
    transform: translateY(0);
    margin-bottom: var(--space-6);
  }

  /* CTA animates */
  .premium-panel:hover .premium-panel__cta {
    opacity: 1;
    max-height: 50px;
    transform: translateY(0);
  }

  /* Background Zoom & Brightness on Hover */
  .premium-panel:hover .premium-panel__bg {
    transform: scale(1.08) translateZ(0);
    filter: brightness(0.9) contrast(1.05);
  }

  /* Overlay reduced on Hover */
  .premium-panel:hover .premium-panel__overlay {
    opacity: 0.6;
  }
}

/* ═══════════════════════════════════════════════════
   BACKGROUND IMAGE & PARALLAX EFFECT
   ══════════════════════════════════════════════════════ */

.premium-panel__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 1;
  will-change: transform, filter;
  transition: transform 0.7s var(--ease-premium), filter 0.7s var(--ease-premium);
  transform: scale(1) translateZ(0);
  filter: brightness(0.6) contrast(1.05);
  backface-visibility: hidden;
}

/* ═══════════════════════════════════════════════════
   OVERLAY GRADIENTS & COLORS
   ══════════════════════════════════════════════════════ */

.premium-panel__overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 2;
  will-change: opacity;
  background: linear-gradient(
    to top,
    rgba(17, 17, 17, 0.9) 0%,
    rgba(17, 17, 17, 0.45) 50%,
    rgba(17, 17, 17, 0.1) 100%
  );
  transition: opacity 0.7s var(--ease-premium);
  opacity: 0.85;
}

/* Base typography elements for all panels */
.premium-panel__number {
  color: rgba(255, 255, 255, 0.4);
}

.premium-panel__title {
  color: var(--color-white);
}

.premium-panel__cta {
  color: var(--color-white);
}

/* ═══════════════════════════════════════════════════
   PANEL CONTENT STRUCTURE
   ══════════════════════════════════════════════════════ */

.premium-panel__content {
  position: relative;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  height: 100%;
  width: 100%;
}

.premium-panel__number {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.05em;
  margin-bottom: auto;
  transition: opacity 0.7s var(--ease-premium);
  transform: translateZ(0);
}

.premium-panel__title {
  font-family: var(--font-serif);
  font-size: 2.125rem;
  font-weight: var(--fw-regular);
  line-height: 1.15;
  margin-bottom: var(--space-4);
  text-shadow: none;
  word-wrap: break-word;
  will-change: transform;
  transition: transform 0.7s var(--ease-premium), font-size 0.7s var(--ease-premium);
}

@media (max-width: 1200px) {
  .premium-panel__title {
    font-size: 1.75rem;
    margin-bottom: var(--space-4);
  }
}

@media (max-width: 768px) {
  .premium-panel__title {
    font-size: 1.35rem;
    margin-bottom: 0;
  }
}

/* Description text (shown on hover / expansion) */
.premium-panel__description {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.8);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transform: translateY(20px);
  margin-bottom: 0;
  will-change: opacity, transform, max-height;
  transition: opacity 0.5s var(--ease-premium) 0.15s,
              transform 0.5s var(--ease-premium) 0.15s,
              max-height 0.5s var(--ease-premium) 0.15s,
              margin-bottom 0.5s var(--ease-premium) 0.15s;
}

.premium-panel__cta {
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: var(--fw-bold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transform: translateY(20px);
  will-change: opacity, transform, max-height;
  transition: opacity 0.5s var(--ease-premium) 0.25s,
              transform 0.5s var(--ease-premium) 0.25s,
              max-height 0.5s var(--ease-premium) 0.25s;
}

.cta-arrow {
  display: inline-block;
  font-size: 0.875rem;
  transition: transform 0.7s var(--ease-premium);
  will-change: transform;
}

.premium-panel:hover .cta-arrow,
.premium-panel.is-expanded .cta-arrow {
  transform: translate(4px, -4px);
}

/* Active state when clicked */
.premium-panel.is-active {
  box-shadow: 0 0 0 2px var(--color-green), var(--shadow-lg);
  border-color: var(--color-green);
}

/* ═══════════════════════════════════════════════════
   ANIMATIONS – PREMIUM MICRO-INTERACTIONS
   ══════════════════════════════════════════════════════ */

@keyframes accent-line {
  from {
    width: 0;
    opacity: 0;
  }
  to {
    width: 100%;
    opacity: 1;
  }
}

@keyframes title-scale {
  from {
    font-size: inherit;
    opacity: 0.9;
  }
  to {
    font-size: 2.375rem;
    opacity: 1;
  }
}

@media (max-width: 1200px) {
  @keyframes title-scale {
    to {
      font-size: 1.95rem;
    }
  }
}

@keyframes description-fade {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cta-slide {
  from {
    opacity: 0;
    transform: translateX(-8px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* ═══════════════════════════════════════════════════
   DYNAMIC CONTENT CONTAINER
   ══════════════════════════════════════════════════════ */

.premium-dynamic-content {
  background-color: var(--color-white);
  padding: var(--space-16) 0;
  scroll-margin-top: 100px;
  border-bottom: 1px solid var(--color-gray-300);
  position: relative;
}

.dynamic-welcome {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-12) 0;
  animation: fade-in 0.8s var(--ease-premium);
  opacity: 1;
  visibility: visible;
  transition: opacity 0.8s var(--ease-premium), visibility 0.8s var(--ease-premium);
}

.dynamic-title {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  margin-bottom: var(--space-4);
  color: var(--color-near-black);
  font-weight: var(--fw-regular);
}

.dynamic-desc {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  color: var(--color-gray-500);
  line-height: var(--lh-relaxed);
}

/* Dynamic Section Container */
.dynamic-section {
  opacity: 0;
  transform: translateX(20px) translateY(10px);
  transition: opacity 0.9s var(--ease-premium) 0.1s,
              transform 0.9s var(--ease-premium) 0.1s;
  pointer-events: none;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-12) 0;
  will-change: opacity, transform;
  visibility: hidden;
  height: 0;
}

/* Exit animation for old section */
.dynamic-section.exit {
  opacity: 0;
  transform: translateX(-20px) translateY(10px);
  animation: section-exit 0.6s var(--ease-premium) forwards;
}

.dynamic-section.is-active {
  opacity: 1;
  transform: translateX(0) translateY(0);
  pointer-events: auto;
  visibility: visible;
  height: auto;
  animation: section-enter 0.8s var(--ease-premium) forwards;
}

@keyframes section-enter {
  from {
    opacity: 0;
    transform: translateX(20px);
    visibility: hidden;
  }
  to {
    opacity: 1;
    transform: translateX(0);
    visibility: visible;
  }
}

@keyframes section-exit {
  from {
    opacity: 1;
    transform: translateX(0);
    visibility: visible;
  }
  to {
    opacity: 0;
    transform: translateX(-20px);
    visibility: hidden;
  }
}

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

.dynamic-section__title {
  font-family: var(--font-serif);
  font-size: var(--fs-h2);
  margin-bottom: var(--space-4);
  font-weight: var(--fw-regular);
}

.dynamic-section__title--green {
  color: var(--color-green);
}

.dynamic-section__title--violet {
  color: var(--color-violet);
}

.dynamic-section__desc {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  margin-bottom: var(--space-8);
  color: var(--color-gray-600);
  line-height: var(--lh-relaxed);
}

/* ═══════════════════════════════════════════════════
   MOBILE & TOUCH INTERACTIONS
   ══════════════════════════════════════════════════════ */

@media (hover: none) and (pointer: coarse) {
  /* Touch devices – active feedbacks */
  .premium-panel:active {
    box-shadow: var(--shadow-lg);
  }
}

/* ═══════════════════════════════════════════════════
   ACCESSIBILITY & KEYBOARD NAVIGATION
   ══════════════════════════════════════════════════════ */

.premium-panel:focus-visible {
  outline: 2px solid var(--color-green);
  outline-offset: 4px;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
  .premium-panel,
  .premium-panel__bg,
  .premium-panel__title,
  .premium-panel__description,
  .premium-panel__cta,
  .dynamic-section {
    transition: none !important;
    animation: none !important;
  }

  .premium-panel:hover {
    transform: none;
  }
}

/* Dark mode support (optional) */
@media (prefers-color-scheme: dark) {
  .expertise-section {
    background-color: var(--color-near-black);
  }

  .premium-panel--beige {
    background-color: #2a2a28;
  }

  .premium-panel--beige .premium-panel__overlay {
    background: linear-gradient(
      to top,
      rgba(42, 42, 40, 0.95) 0%,
      rgba(42, 42, 40, 0.2) 50%,
      rgba(42, 42, 40, 0) 100%
    );
  }
}