/* ── Bosch eBike Demo - Base CSS ── */
/* Core layout, grid, typography, and components */

/* ── Reset & Base ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: var(--font-size-base, 16px);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

/* ── Container & Grid ── */
.container {
  width: 100%;
  max-width: 1348px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 960px;
}

.row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--grid-gap, 24px);
}

.row--centered {
  justify-content: center;
  text-align: center;
}

/* ── Transitions ── */
.main-content {
  transition: opacity 0.4s ease;
}

.main-content.transitioning {
  opacity: 0;
}

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  letter-spacing: var(--letter-spacing, 0);
}

.section-overline {
  font-size: calc(1rem * var(--font-size-scale, 1));
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-light);
  margin-bottom: 8px;
  transition: color var(--transition-speed) ease;
}

.section-headline {
  font-size: clamp(1.75rem, 4vw, 3rem);
  font-weight: var(--font-weight-black);
  margin-bottom: 16px;
  transition: color var(--transition-speed) ease;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-block;
  padding: var(--button-padding, 12px 32px);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-weight: var(--button-font-weight, 700);
  font-size: 1rem;
  text-transform: var(--button-text-transform, none);
  border-radius: var(--button-radius, 0);
  border: none;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
  letter-spacing: var(--letter-spacing, 0);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-secondary {
  display: inline-block;
  padding: var(--button-padding, 12px 32px);
  background: transparent;
  color: var(--color-primary);
  font-weight: var(--button-font-weight, 700);
  border: 2px solid var(--color-primary);
  border-radius: var(--button-radius, 0);
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.btn-secondary:hover {
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

/* ── Supergraphic ── */
.supergraphic {
  height: 4px;
  background: var(--supergraphic-color, #EA0016);
  transition: background var(--transition-speed) ease;
}

/* ── Header ── */
.header-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--nav-bg);
  height: var(--header-height, 64px);
  display: flex;
  align-items: center;
  transition: all var(--transition-speed) ease;
  border-bottom: 1px solid var(--color-border);
}

.header-nav.scrolled {
  box-shadow: 0 2px 20px rgba(0,0,0,0.1);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1348px;
  margin: 0 auto;
  padding: 0 24px;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.header-logo img {
  height: 32px;
  width: auto;
}

.header-logo-text {
  font-size: 0.85rem;
  color: var(--nav-text);
  transition: color var(--transition-speed) ease;
}

.header-logo-text strong {
  font-weight: var(--font-weight-bold);
}

.header-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: var(--font-weight-regular);
  color: var(--nav-text);
  transition: color var(--transition-speed) ease;
  cursor: pointer;
  white-space: nowrap;
}

.nav-link:hover {
  color: var(--color-primary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-actions svg {
  width: 22px;
  height: 22px;
  fill: var(--nav-text);
  transition: fill var(--transition-speed) ease;
}

/* ── Section Base ── */
.section {
  padding: var(--section-padding, 80px 0);
  transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease, padding var(--transition-speed) ease;
  opacity: 0;
  transform: translateY(30px);
}

.section.animate-in {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease, background-color var(--transition-speed) ease, color var(--transition-speed) ease;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

/* ── Hero Section ── */
.hero-section {
  position: relative;
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-top: var(--header-height, 64px);
  opacity: 1;
  transform: none;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--hero-overlay);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: var(--color-text-inverse);
  padding: 40px 24px;
  max-width: 800px;
}

.hero-overlines {
  height: 2em;
  position: relative;
  margin-bottom: 12px;
  overflow: hidden;
}

.hero-overline {
  position: absolute;
  left: 0;
  right: 0;
  text-align: center;
  font-size: calc(0.85rem * var(--font-size-scale, 1));
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: rgba(255,255,255,0.7);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.hero-overline.active {
  opacity: 1;
  transform: translateY(0);
}

.hero-headline {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  font-weight: var(--font-weight-black);
  margin-bottom: 20px;
  line-height: 1.1;
  transition: font-size var(--transition-speed) ease;
}

.hero-subtext {
  font-size: calc(1.1rem * var(--font-size-scale, 1));
  line-height: 1.7;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
}

/* ── Image-Text Slider ── */
.image-text-slider {
  background: var(--color-bg);
  transition: background var(--transition-speed) ease;
}

.slider-container {
  position: relative;
}

.slider-slides {
  position: relative;
  min-height: 500px;
}

.slider-slide {
  display: none;
  gap: 48px;
  align-items: center;
}

.slider-slide.active {
  display: grid;
  grid-template-columns: 1fr 1fr;
  animation: fadeIn 0.5s ease;
}

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

.slider-slide-text {
  padding-right: 24px;
}

.slider-slide-text h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  font-weight: var(--font-weight-bold);
  margin-bottom: 16px;
}

.slider-slide-text p {
  font-size: calc(1rem * var(--font-size-scale, 1));
  color: var(--color-text-light);
  line-height: 1.7;
}

.slider-slide-image {
  border-radius: var(--border-radius);
  overflow: hidden;
}

.slider-slide-image img {
  width: 100%;
  height: 450px;
  object-fit: cover;
  border-radius: var(--border-radius);
  transition: border-radius var(--transition-speed) ease;
}

.slider-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  margin-top: 32px;
}

.slider-prev,
.slider-next {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-speed) ease;
}

.slider-prev:hover,
.slider-next:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.slider-prev svg,
.slider-next svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.slider-counter {
  font-size: 0.9rem;
  font-weight: var(--font-weight-bold);
  min-width: 60px;
  text-align: center;
}

.slider-pagination {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-top: 24px;
}

.slider-pagination-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-border);
  border: none;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.slider-pagination-dot.active {
  background: var(--color-primary);
  transform: scale(1.2);
}

/* ── Tab Block ── */
.tab-section {
  background: var(--color-bg);
  transition: background var(--transition-speed) ease;
}

.tab-block__tabs {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}

.tab-block__tab {
  padding: 12px 24px;
  font-weight: var(--font-weight-bold);
  font-size: 0.95rem;
  color: var(--color-text-light);
  border-bottom: 3px solid transparent;
  transition: all var(--transition-speed) ease;
  cursor: pointer;
  background: none;
}

.tab-block__tab.active {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tab-block__tab:hover {
  color: var(--color-primary);
}

.tab-panel {
  display: none;
  position: relative;
  border-radius: var(--border-radius);
  overflow: hidden;
  min-height: 400px;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.tab-panel-bg {
  position: relative;
  width: 100%;
  min-height: 500px;
  height: auto;
  overflow: hidden;
  border-radius: var(--border-radius);
}

.tab-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.tab-content-overlay {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 48px;
  background: linear-gradient(0deg, rgba(0,0,0,0.8) 0%, transparent 100%);
  color: var(--color-text-inverse);
}

.tab-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-black);
  margin-bottom: 12px;
}

.tab-text {
  font-size: calc(1rem * var(--font-size-scale, 1));
  margin-bottom: 24px;
  max-width: 500px;
  line-height: 1.6;
  opacity: 0.9;
}

.tab-cta {
  display: inline-block;
}

/* ── System Teaser Grid ── */
.system-teaser {
  background: var(--color-bg-alt);
  transition: background var(--transition-speed) ease;
}

.system-teaser__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: auto auto;
  gap: var(--grid-gap);
}

.system-teaser__item {
  background: var(--color-bg);
  border-radius: var(--card-radius);
  overflow: hidden;
  text-align: center;
  padding: 24px;
  transition: all var(--transition-speed) ease;
  cursor: pointer;
}

.system-teaser__item:first-child {
  grid-column: span 3;
}

.system-teaser__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow);
}

.system-teaser__image {
  width: 100%;
  max-width: 300px;
  margin: 0 auto 16px;
}

.system-teaser__item:first-child .system-teaser__image {
  max-width: 500px;
}

.system-teaser__label {
  font-size: calc(1.1rem * var(--font-size-scale, 1));
  font-weight: var(--font-weight-bold);
  display: block;
}

/* ── Brand Section ── */
.brand-section {
  background: var(--color-bg-purple);
  color: var(--color-text-inverse);
  text-align: center;
  padding: 100px 24px;
  transition: background var(--transition-speed) ease;
}

.brand-tagline {
  font-size: clamp(2rem, 5vw, 4rem);
  font-weight: var(--font-weight-black);
  letter-spacing: var(--letter-spacing);
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

/* ── App Section ── */
.app-section {
  background: var(--color-bg);
  transition: background var(--transition-speed) ease;
}

.app-slider-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.app-images {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0;
  min-height: 500px;
  position: relative;
}

.app-slide-image {
  width: 180px;
  border-radius: 24px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.15);
  opacity: 0;
  transform: scale(0.75);
  transition: all 0.4s ease;
  position: absolute;
  pointer-events: none;
  display: none;
}

.app-slide-image.active {
  opacity: 1;
  transform: scale(1);
  z-index: 3;
  position: relative;
  display: block;
  pointer-events: auto;
}

.app-slide-image.adjacent {
  display: block;
  opacity: 0.35;
  transform: scale(0.85);
}

.app-slide-image.adjacent-prev {
  z-index: 1;
  left: 0;
}

.app-slide-image.adjacent-next {
  z-index: 1;
  right: 0;
}

.app-text-content {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.app-text-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.app-slide-text {
  display: none;
}

.app-slide-text.active {
  display: block;
  animation: fadeIn 0.4s ease;
}

.app-slide-text h3 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: var(--font-weight-black);
  margin-bottom: 12px;
}

.app-slide-text p {
  font-size: calc(1rem * var(--font-size-scale, 1));
  color: var(--color-text-light);
  line-height: 1.7;
}

/* ── Category Slider ── */
.category-section {
  background: var(--color-bg);
  transition: background var(--transition-speed) ease;
}

.category-slider-wrapper {
  position: relative;
  -webkit-mask-image: linear-gradient(to right, transparent, black 40px, black calc(100% - 40px), transparent);
  mask-image: linear-gradient(to right, transparent, black 40px, black calc(100% - 40px), transparent);
}

.category-track {
  display: flex;
  gap: 24px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 16px;
  scrollbar-width: none;
}

.category-track::-webkit-scrollbar {
  display: none;
}

.category-card {
  flex: 0 0 calc(25% - 18px);
  min-width: 250px;
  scroll-snap-align: start;
  border-radius: var(--card-radius);
  overflow: hidden;
  position: relative;
  cursor: pointer;
  transition: all var(--transition-speed) ease;
}

.category-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow);
}

.category-image-wrapper {
  position: relative;
  height: 380px;
  overflow: hidden;
}

.category-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.category-card:hover .category-image {
  transform: scale(1.05);
}

.category-info {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 24px;
  background: linear-gradient(0deg, rgba(0,0,0,0.7) 0%, transparent 100%);
  color: white;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
}

.category-name {
  font-size: calc(1.1rem * var(--font-size-scale, 1));
  font-weight: var(--font-weight-bold);
}

.category-link {
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.category-link svg {
  fill: white;
}

.category-nav {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
}

/* ── News Section ── */
.news-section {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  transition: background var(--transition-speed) ease;
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--grid-gap);
}

.news-card {
  background: rgba(255,255,255,0.05);
  border-radius: var(--card-radius);
  overflow: hidden;
  transition: all var(--transition-speed) ease;
  cursor: pointer;
}

.news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 30px rgba(0,0,0,0.3);
}

.news-image-wrapper {
  height: 200px;
  overflow: hidden;
}

.news-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.news-card:hover .news-image {
  transform: scale(1.05);
}

.news-content {
  padding: 24px;
}

.news-title {
  font-size: calc(1.1rem * var(--font-size-scale, 1));
  font-weight: var(--font-weight-bold);
  margin-bottom: 8px;
}

.news-text {
  font-size: calc(0.9rem * var(--font-size-scale, 1));
  opacity: 0.7;
  line-height: 1.6;
}

/* ── Dealer Section ── */
.dealer-section {
  background: var(--color-bg-alt);
  transition: background var(--transition-speed) ease;
}

.dealer-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.dealer-info {
  max-width: 500px;
}

.dealer-subtext {
  font-size: calc(1rem * var(--font-size-scale, 1));
  color: var(--color-text-light);
  margin-bottom: 24px;
  line-height: 1.7;
}

.dealer-map {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  height: 350px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-light);
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.dealer-map-placeholder {
  text-align: center;
}

.dealer-map-placeholder svg {
  width: 64px;
  height: 64px;
  fill: var(--color-border);
  margin-bottom: 12px;
}

/* ── Footer ── */
.footer {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  padding: 64px 0 32px;
  transition: background var(--transition-speed) ease;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.footer-logo {
  height: 28px;
  filter: brightness(0) invert(1);
}

.footer-tagline {
  font-size: 0.85rem;
  opacity: 0.6;
}

.footer-col h4 {
  font-size: 0.85rem;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 16px;
  opacity: 0.6;
}

.footer-col a {
  display: block;
  font-size: 0.9rem;
  padding: 4px 0;
  opacity: 0.8;
  transition: opacity var(--transition-speed) ease;
}

.footer-col a:hover {
  opacity: 1;
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  opacity: 0.5;
}

.footer-social {
  display: flex;
  gap: 16px;
}

.footer-social svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
  opacity: 0.6;
  transition: opacity var(--transition-speed) ease;
}

.footer-social svg:hover {
  opacity: 1;
}

/* ── Version Switcher ── */
.version-switcher {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 9999;
  background: rgba(26,28,29,0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 16px;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
  border: 1px solid rgba(255,255,255,0.1);
}

.switcher-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.4);
  text-align: center;
  margin-bottom: 4px;
}

.switcher-btn {
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255,255,255,0.7);
  transition: all 0.25s ease;
  white-space: nowrap;
  text-align: left;
  background: transparent;
}

.switcher-btn:hover {
  background: rgba(255,255,255,0.1);
  color: white;
}

.switcher-btn.active {
  background: var(--color-primary, #EA0016);
  color: white;
}

.switcher-btn .switcher-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  margin-right: 8px;
}

.switcher-btn[data-theme="default"] .switcher-dot { background: #EA0016; }
.switcher-btn[data-theme="genz"] .switcher-dot { background: #FF6B35; }
.switcher-btn[data-theme="sports"] .switcher-dot { background: #EA0016; }
.switcher-btn[data-theme="silver"] .switcher-dot { background: #005691; }

.switcher-shortcut {
  font-size: 0.6rem;
  opacity: 0.4;
  margin-left: auto;
  padding-left: 12px;
}

/* ── Responsive ── */

@media (max-width: 1200px) {
  .system-teaser__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .system-teaser__item:first-child {
    grid-column: span 3;
  }
}

@media (max-width: 1024px) {
  .header-links {
    gap: 20px;
  }

  .app-slider-container {
    grid-template-columns: 1fr;
  }

  .app-images {
    min-height: 400px;
  }

  .dealer-content {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .category-card {
    flex: 0 0 calc(33% - 16px);
  }
}

@media (max-width: 768px) {
  .header-links {
    display: none;
  }

  .slider-slide.active {
    grid-template-columns: 1fr;
  }

  .slider-slide-image img {
    height: 300px;
  }

  .system-teaser__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .system-teaser__item:first-child {
    grid-column: span 2;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .tab-block__tabs {
    gap: 2px;
  }

  .tab-block__tab {
    padding: 10px 16px;
    font-size: 0.85rem;
  }

  .tab-panel-bg {
    height: 350px;
  }

  .tab-content-overlay {
    padding: 24px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .category-card {
    flex: 0 0 calc(50% - 12px);
    min-width: 200px;
  }

  .version-switcher {
    bottom: 12px;
    right: 12px;
    padding: 12px;
  }
}