/* Page-owned styles for bubble-kombinationen */
.bk-page {
  overflow-x: hidden;
}

/* Hero */
.bk-hero {
  background: linear-gradient(180deg, var(--color-seafoam) 0%, var(--color-sand) 100%);
  padding-block: var(--space-3xl) var(--space-2xl);
  position: relative;
}

.bk-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 40' preserveAspectRatio='none'%3E%3Cpath d='M0,20 C300,40 600,0 1200,20 L1200,40 L0,40 Z' fill='%23F7E6BE'/%3E%3C/svg%3E");
  background-size: cover;
  background-position: bottom;
  pointer-events: none;
}

.bk-hero__inner {
  max-width: 700px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.bk-hero__title {
  font-size: clamp(2rem, 6vw, 3rem);
  line-height: 1.1;
  margin-block-end: 0;
}

.bk-hero__lead {
  max-width: 45ch;
  margin-block-end: 0;
}

.bk-hero__points {
  max-width: 45ch;
  margin-block-end: 0;
  text-align: start;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding-inline-start: 0;
  list-style: none;
}

.bk-hero__points li {
  position: relative;
  padding-inline-start: var(--space-lg);
  margin-block-end: 0;
}

.bk-hero__points li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-coral);
  font-weight: 700;
}

.bk-hero__cta {
  margin-block-start: var(--space-sm);
}

/* Basics */
.bk-basics {
  background-color: var(--color-sand);
}

.bk-basics__inner {
  max-width: 800px;
  margin-inline: 0;
  text-align: start;
}

.bk-basics__title {
  margin-block-end: var(--space-md);
}

.bk-basics__text {
  margin-block-end: var(--space-md);
}

.bk-basics__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
}

/* Special bubbles */
.bk-special {
  background-color: var(--color-seafoam);
}

.bk-special__inner {
  max-width: 1200px;
}

.bk-special__title {
  text-align: center;
  margin-block-end: var(--space-xl);
}

.bk-special__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
}

.bk-special-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.bk-special-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-pill);
  background-color: rgba(255, 255, 255, 0.7);
  margin-block-end: var(--space-xs);
}

.bk-special-card__title {
  margin-block-end: 0;
}

.bk-special-card__text {
  margin-block-end: 0;
}

.bk-special-card__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
}

/* Examples */
.bk-examples {
  background-color: var(--color-sand);
}

.bk-examples__inner {
  max-width: 1200px;
}

.bk-examples__title {
  text-align: center;
  margin-block-end: var(--space-xl);
}

.bk-examples__row {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
  margin-block-end: var(--space-2xl);
}

.bk-examples__row:last-child {
  margin-block-end: 0;
}

.bk-examples__row--reverse .bk-examples__text {
  order: 1;
}

.bk-examples__row--reverse .bk-examples__media {
  order: 0;
}

.bk-examples__text {
  min-width: 0;
}

.bk-examples__subtitle {
  margin-block-end: var(--space-sm);
}

.bk-examples__paragraph {
  margin-block-end: var(--space-md);
}

.bk-examples__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
}

.bk-examples__media {
  min-width: 0;
  width: 100%;
}

.bk-examples__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Tips */
.bk-tips {
  background-color: var(--color-seafoam);
}

.bk-tips__inner {
  max-width: 800px;
  margin-inline: 0;
  text-align: start;
}

.bk-tips__title {
  margin-block-end: var(--space-md);
}

.bk-tips__intro {
  margin-block-end: var(--space-md);
}

.bk-tips__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.bk-tips__list li {
  margin-block-end: 0;
}

/* Mistakes */
.bk-mistakes {
  background-color: var(--color-sand);
}

.bk-mistakes__inner {
  max-width: 1200px;
}

.bk-mistakes__title {
  margin-block-end: var(--space-xl);
}

.bk-mistakes__grid {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-lg);
  align-items: center;
}

.bk-mistakes__text {
  min-width: 0;
}

.bk-mistakes__intro {
  margin-block-end: var(--space-md);
}

.bk-mistakes__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.bk-mistakes__list li {
  margin-block-end: 0;
}

.bk-mistakes__media {
  min-width: 0;
  width: 100%;
}

.bk-mistakes__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Level types */
.bk-leveltypes {
  background-color: var(--color-seafoam);
}

.bk-leveltypes__inner {
  max-width: 1200px;
}

.bk-leveltypes__title {
  text-align: center;
  margin-block-end: var(--space-xl);
}

.bk-leveltypes__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-lg);
}

.bk-level-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  min-width: 0;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.bk-level-card__icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-block-end: var(--space-xs);
}

.bk-level-card__title {
  margin-block-end: 0;
}

.bk-level-card__text {
  margin-block-end: 0;
}

.bk-level-card__list {
  margin-block-end: 0;
  padding-inline-start: var(--space-lg);
}

/* Advanced accordion */
.bk-advanced {
  background-color: var(--color-sand);
}

.bk-advanced__inner {
  max-width: 800px;
  margin-inline: 0;
  text-align: start;
}

.bk-advanced__title {
  margin-block-end: var(--space-xl);
}

.bk-accordion {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.bk-accordion__item {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  border: var(--border-subtle);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.bk-accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  width: 100%;
  padding: var(--space-md) var(--space-lg);
  background-color: transparent;
  border: none;
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--text-h3-size);
  font-weight: 600;
  color: var(--color-text);
  text-align: start;
  transition: background-color var(--transition-fast);
}

.bk-accordion__trigger:hover {
  background-color: rgba(100, 216, 230, 0.1);
}

.bk-accordion__trigger:focus-visible {
  outline: none;
  box-shadow: inset var(--focus-ring);
}

.bk-accordion__icon {
  position: relative;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}

.bk-accordion__icon::before,
.bk-accordion__icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 2px;
  background-color: var(--color-navy);
  transform: translate(-50%, -50%);
  transition: transform var(--transition-fast);
}

.bk-accordion__icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.bk-accordion__item.is-open .bk-accordion__icon::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.bk-accordion__panel {
  padding: 0 var(--space-lg) var(--space-lg);
}

.bk-accordion__content {
  margin-block-end: 0;
}

/* Final */
.bk-final {
  background: linear-gradient(180deg, var(--color-sand) 0%, var(--color-seafoam) 100%);
  padding-block: var(--space-3xl) var(--space-2xl);
  position: relative;
}

.bk-final::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 100%;
  height: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 1200 40' preserveAspectRatio='none'%3E%3Cpath d='M0,20 C300,0 600,40 1200,20 L1200,0 L0,0 Z' fill='%23F7E6BE'/%3E%3C/svg%3E");
  background-size: cover;
  background-position: top;
  pointer-events: none;
}

.bk-final__inner {
  max-width: 700px;
  margin-inline: auto;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.bk-final__title {
  margin-block-end: 0;
}

.bk-final__text {
  max-width: 45ch;
  margin-block-end: 0;
}

.bk-final__cta {
  margin-block-start: var(--space-sm);
}

/* Responsive */
@media (max-width: 1023px) {
  .bk-special__grid,
  .bk-leveltypes__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .bk-special__grid .bk-special-card:last-child {
    grid-column: span 2;
  }

  .bk-leveltypes__grid .bk-level-card:last-child {
    grid-column: span 2;
  }
}

@media (max-width: 767px) {
  .bk-hero {
    padding-block: var(--space-xl) var(--space-lg);
  }

  .bk-hero__inner,
  .bk-final__inner {
    gap: var(--space-md);
  }

  .bk-hero__title {
    font-size: 1.75rem;
  }

  .bk-special__grid,
  .bk-leveltypes__grid {
    grid-template-columns: 1fr;
  }

  .bk-special__grid .bk-special-card:last-child,
  .bk-leveltypes__grid .bk-level-card:last-child {
    grid-column: auto;
  }

  .bk-examples__row,
  .bk-mistakes__grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .bk-examples__row--reverse .bk-examples__text {
    order: 0;
  }

  .bk-examples__row--reverse .bk-examples__media {
    order: 0;
  }

  .bk-examples__media,
  .bk-mistakes__media {
    order: -1;
  }

  .bk-basics__inner,
  .bk-tips__inner,
  .bk-advanced__inner {
    margin-inline: auto;
  }
}

@media (max-width: 480px) {
  .bk-hero__points,
  .bk-hero__lead,
  .bk-final__text {
    max-width: 100%;
  }

  .bk-accordion__trigger {
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-body-size);
  }

  .bk-accordion__panel {
    padding: 0 var(--space-md) var(--space-md);
  }
}