/**
 * Funktionen Page Styles — MarktLinse
 * Feature presentation with per-section carousels
 * Depends on: style.css, homepage.css (tokens, nav, footer), subpage.css (hero, CTAs)
 *
 * @version 2.0.0
 * @date 2026-02-28
 */

/* ============================================
   HERO OVERRIDE (kompakter als Standard-Subpage)
   ============================================ */
.subpage-hero {
  padding: 120px 0 48px;
}

/* ============================================
   STICKY SECTION NAVIGATION
   ============================================ */
.fn-section-nav {
  position: sticky;
  top: 64px;
  z-index: 150;
  display: flex;
  justify-content: center;
  padding: var(--spacing-3) var(--spacing-6);
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.92) 0%,
    rgba(255, 255, 255, 0.85) 100%
  );
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
}

.fn-section-nav__inner {
  display: inline-flex;
  gap: var(--spacing-1);
  padding: var(--spacing-1);
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.55) 0%,
    rgba(255, 255, 255, 0.3) 100%
  );
  backdrop-filter: blur(40px) saturate(200%);
  -webkit-backdrop-filter: blur(40px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.06),
    0 2px 8px rgba(0, 0, 0, 0.03),
    0 1px 0 rgba(255, 255, 255, 0.95) inset;
  position: relative;
}

.fn-section-nav__indicator {
  position: absolute;
  height: calc(100% - 8px);
  top: 4px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 255, 255, 0.5) 100%
  );
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-radius: var(--radius-btn);
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.06),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
  transition:
    left 0.4s cubic-bezier(0.34, 1.56, 0.64, 1),
    width 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 1;
  pointer-events: none;
}

.fn-section-nav__item {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-2) var(--spacing-5);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: none;
  border: none;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: color var(--transition-slow);
  white-space: nowrap;
}

.fn-section-nav__item:hover {
  color: var(--text-secondary);
}

.fn-section-nav__item.is-active {
  color: var(--text-primary);
  font-weight: 600;
}

/* ============================================
   SECTION LAYOUT
   ============================================ */
.fn-section {
  padding: 80px var(--spacing-6);
  max-width: 1200px;
  margin: 0 auto;
}

.fn-section + .fn-section {
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}

.fn-section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto var(--spacing-8);
}

.fn-section__title {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.25;
  margin: 0 0 var(--spacing-4);
}

.fn-section__intro {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin: 0;
}

/* ============================================
   CAROUSEL
   ============================================ */
.fn-carousel {
  position: relative;
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  overflow: hidden;
}

.fn-carousel__track {
  display: flex;
  width: 100%;
}

.fn-carousel__slide {
  width: 100%;
  min-width: 100%;
  flex-shrink: 0;
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: var(--spacing-8);
  align-items: center;
  padding: var(--spacing-2) var(--spacing-4);
}

/* Grid-Items bleiben in ihrer Zelle */
.fn-carousel__slide .fn-screenshot,
.fn-carousel__text {
  min-width: 0;
  max-width: 100%;
}

.fn-carousel__text {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  padding-top: var(--spacing-2);
}

/* ============================================
   FEATURE TEXT STYLES (reused from fn-row)
   ============================================ */
.fn-row__title {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  margin: 0;
}

.fn-row__problem {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
  padding-left: var(--spacing-3);
  border-left: 2px solid rgba(0, 119, 182, 0.2);
}

.fn-row__solution {
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--text-primary);
  line-height: 1.65;
  margin: 0;
}

/* ============================================
   SCREENSHOT GLASS FRAME
   ============================================ */
.fn-screenshot {
  position: relative;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.7) 0%,
    rgba(255, 255, 255, 0.4) 100%
  );
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  padding: var(--spacing-3);
  box-shadow:
    0 16px 48px rgba(0, 0, 0, 0.08),
    0 6px 16px rgba(0, 0, 0, 0.04),
    0 1px 0 rgba(255, 255, 255, 0.95) inset;
  overflow: hidden;
}

.fn-screenshot img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  object-position: top left;
  border-radius: var(--radius-lg);
}

/* App-Frame Dots (Browser-like header) */
.fn-screenshot__dots {
  display: flex;
  gap: 6px;
  padding: var(--spacing-2) var(--spacing-3);
  margin-bottom: var(--spacing-2);
}

.fn-screenshot__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: rgba(0, 0, 0, 0.08);
}

/* ============================================
   CAROUSEL ARROWS
   ============================================ */
.fn-carousel__arrow {
  position: absolute;
  top: 35%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 255, 255, 0.6) 100%
  );
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-full);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.08),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
  cursor: pointer;
  color: var(--text-secondary);
  transition: color var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.fn-carousel__arrow:hover {
  color: var(--text-primary);
  box-shadow:
    0 6px 20px rgba(0, 0, 0, 0.12),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

.fn-carousel__arrow:disabled {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

.fn-carousel__arrow svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.fn-carousel__arrow--prev {
  left: var(--spacing-2);
}

.fn-carousel__arrow--next {
  right: var(--spacing-2);
}

/* ============================================
   CAROUSEL TABS
   ============================================ */
.fn-carousel__tabs {
  display: inline-flex;
  gap: var(--spacing-1);
  padding: var(--spacing-1);
  margin: var(--spacing-6) auto 0;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.55) 0%,
    rgba(255, 255, 255, 0.3) 100%
  );
  backdrop-filter: blur(40px) saturate(200%);
  -webkit-backdrop-filter: blur(40px) saturate(200%);
  border: 1px solid rgba(255, 255, 255, 0.6);
  border-radius: var(--radius-xl);
  box-shadow:
    0 4px 16px rgba(0, 0, 0, 0.04),
    0 1px 0 rgba(255, 255, 255, 0.95) inset;
}

/* Center the tabs wrapper */
.fn-carousel__tabs-wrap {
  display: flex;
  justify-content: center;
}

.fn-carousel__tab {
  padding: var(--spacing-2) var(--spacing-4);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-tertiary);
  background: none;
  border: none;
  border-radius: var(--radius-btn);
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.fn-carousel__tab:hover {
  color: var(--text-secondary);
}

.fn-carousel__tab.is-active {
  color: var(--text-primary);
  font-weight: 600;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.85) 0%,
    rgba(255, 255, 255, 0.5) 100%
  );
  box-shadow:
    0 2px 8px rgba(0, 0, 0, 0.06),
    0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

/* ============================================
   DASHBOARD HERO SCREENSHOT (Full Width)
   ============================================ */
.fn-hero-screenshot {
  max-width: 1000px;
  margin: 0 auto;
}

/* ============================================
   CTA SECTION
   ============================================ */
.fn-cta-section {
  background: var(--gradient-primary);
  padding: 80px var(--spacing-6);
  text-align: center;
}

.fn-cta-section__inner {
  max-width: 600px;
  margin: 0 auto;
}

.fn-cta-section__title {
  font-family: var(--font-headline);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  color: #fff;
  margin: 0 0 var(--spacing-4);
}

.fn-cta-section__subtitle {
  font-family: var(--font-body);
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.9);
  line-height: 1.6;
  margin: 0 0 calc(var(--spacing-6) + var(--spacing-1));
}

.fn-cta-section__buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-4);
  flex-wrap: wrap;
}

.fn-cta-btn--primary {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: var(--spacing-3) calc(var(--spacing-6) + var(--spacing-1));
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--color-primary);
  background: #fff;
  border-radius: var(--radius-btn);
  text-decoration: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.fn-cta-btn--primary:hover {
  opacity: 0.92;
  transform: translateY(-1px);
}

.fn-cta-btn--primary svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.fn-cta-btn--secondary {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-3) calc(var(--spacing-6) + var(--spacing-1));
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.9);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-btn);
  text-decoration: none;
  transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}

.fn-cta-btn--secondary:hover {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.6);
  background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   RESPONSIVE — Tablet
   ============================================ */
@media (max-width: 1024px) {
  .fn-section {
    padding: 60px var(--spacing-5);
  }

  .fn-section-nav__inner {
    gap: 0;
  }

  .fn-section-nav__item {
    padding: var(--spacing-2) var(--spacing-4);
    font-size: 0.8125rem;
  }

  /* Stack vertically on tablet */
  .fn-carousel__slide {
    grid-template-columns: 1fr;
    gap: var(--spacing-5);
    padding: var(--spacing-2);
  }

  /* Arrows inside on tablet */
  .fn-carousel__arrow--prev {
    left: var(--spacing-2);
  }

  .fn-carousel__arrow--next {
    right: var(--spacing-2);
  }

  .fn-carousel__arrow {
    width: 40px;
    height: 40px;
  }
}

/* ============================================
   RESPONSIVE — Mobile
   ============================================ */
@media (max-width: 768px) {
  .fn-section-nav {
    top: 56px;
    padding: var(--spacing-2) var(--spacing-3);
    justify-content: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .fn-section-nav::-webkit-scrollbar {
    display: none;
  }

  .fn-section-nav__item {
    font-size: 0.8125rem;
    padding: var(--spacing-2) var(--spacing-4);
  }

  .fn-section {
    padding: calc(var(--spacing-6) + var(--spacing-1)) var(--spacing-4);
  }

  .fn-section__header {
    margin-bottom: calc(var(--spacing-6) + var(--spacing-1));
  }

  .fn-section__title {
    font-size: 1.375rem;
  }

  .fn-row__title {
    font-size: 1.25rem;
  }

  .fn-screenshot {
    padding: var(--spacing-2);
    border-radius: var(--radius-lg);
  }

  .fn-screenshot__dots {
    padding: var(--spacing-1) var(--spacing-2);
  }

  .fn-screenshot__dot {
    width: 6px;
    height: 6px;
  }

  .fn-hero-screenshot {
    margin: 0;
  }

  /* Hide arrows on mobile (swipe instead) */
  .fn-carousel__arrow {
    display: none;
  }

  .fn-carousel__slide {
    padding: 0;
  }

  /* Tabs: scrollable on mobile */
  .fn-carousel__tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .fn-carousel__tabs::-webkit-scrollbar {
    display: none;
  }

  .fn-carousel__tab {
    font-size: 0.75rem;
    padding: var(--spacing-2) var(--spacing-3);
  }

  .fn-cta-section {
    padding: var(--spacing-8) var(--spacing-4);
  }

  .fn-cta-section__buttons {
    flex-direction: column;
  }

  .fn-cta-btn--primary,
  .fn-cta-btn--secondary {
    width: 100%;
    justify-content: center;
    text-align: center;
  }
}

/* ============================================
   RESPONSIVE — Small Mobile
   ============================================ */
@media (max-width: 380px) {
  .fn-section-nav__item {
    font-size: 0.75rem;
    padding: 6px var(--spacing-3);
  }

  .fn-row__title {
    font-size: 1.125rem;
  }

  .fn-section__title {
    font-size: 1.25rem;
  }

  .fn-carousel__tab {
    font-size: 0.6875rem;
    padding: 6px var(--spacing-2);
  }
}

/* ============================================
   REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
  .fn-section-nav__indicator {
    transition: none;
  }
}