/* ========================================
   Presentations — /presentations
   Downloadable pitch decks (PDF), one card per language edition.
   All classes are prefixed pr- (presentations). Mirrors the design
   tokens established in main.css + the /screenshots gallery.
   ======================================== */

/* ----- Hero ----- */

.pr-hero {
  max-width: var(--container-narrow, 960px);
  margin: 0 auto;
  padding: var(--space-16, 4rem) var(--space-4, 1rem) var(--space-10, 2.5rem);
  text-align: center;
}

.pr-hero h1 {
  font-size: var(--font-size-4xl, 2.25rem);
  font-weight: var(--font-weight-extrabold, 800);
  color: var(--color-text-primary, #0f172a);
  margin-bottom: var(--space-4, 1rem);
  letter-spacing: var(--letter-spacing-tight, -0.025em);
}

.pr-hero__subtitle {
  font-size: var(--font-size-lg, 1.125rem);
  color: var(--color-text-secondary, #475569);
  max-width: 680px;
  margin: 0 auto;
  line-height: var(--line-height-relaxed, 1.625);
}

/* ----- Gallery (responsive grid of deck cards) ----- */

.pr-gallery {
  max-width: var(--container-wide, 1120px);
  margin: 0 auto;
  padding: 0 var(--space-4, 1rem) var(--space-16, 4rem);
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-8, 2rem);
}

/* ----- Card ----- */

.pr-card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg-primary, #fff);
  border: 1px solid var(--color-border-light, #e2e8f0);
  border-radius: var(--radius-xl, 1rem);
  box-shadow: var(--shadow-md, 0 4px 6px -1px rgb(0 0 0 / 0.1));
  overflow: hidden;
  transition: box-shadow var(--transition-base, 250ms cubic-bezier(0.4, 0, 0.2, 1)),
              transform var(--transition-base, 250ms cubic-bezier(0.4, 0, 0.2, 1));
}

.pr-card:hover {
  box-shadow: var(--shadow-xl, 0 20px 25px -5px rgb(0 0 0 / 0.1));
  transform: translateY(-2px);
}

/* Clickable cover — opens the PDF in a new tab */
.pr-card__media {
  position: relative;
  display: block;
  cursor: pointer;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border-light, #e2e8f0);
}

.pr-card__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: top center;
  transition: transform var(--transition-slow, 350ms cubic-bezier(0.4, 0, 0.2, 1));
}

.pr-card__media:hover .pr-card__img {
  transform: scale(1.015);
}

/* Language chip on the cover */
.pr-card__badge {
  position: absolute;
  top: var(--space-3, 0.75rem);
  right: var(--space-3, 0.75rem);
  padding: 0.2rem 0.55rem;
  font-size: var(--font-size-xs, 0.75rem);
  font-weight: var(--font-weight-semibold, 600);
  letter-spacing: 0.04em;
  color: #fff;
  background: rgba(15, 23, 42, 0.72);
  border-radius: var(--radius-sm, 0.375rem);
  backdrop-filter: blur(2px);
}

/* Card body */
.pr-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--space-6, 1.5rem) var(--space-6, 1.5rem) var(--space-6, 1.5rem);
}

.pr-card__title {
  font-size: var(--font-size-xl, 1.25rem);
  font-weight: var(--font-weight-semibold, 600);
  color: var(--color-text-primary, #0f172a);
  margin-bottom: var(--space-2, 0.5rem);
  letter-spacing: var(--letter-spacing-tight, -0.025em);
}

.pr-card__desc {
  font-size: var(--font-size-base, 1rem);
  color: var(--color-text-secondary, #475569);
  line-height: var(--line-height-relaxed, 1.625);
  margin-bottom: var(--space-3, 0.75rem);
}

.pr-card__meta {
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-text-tertiary, #64748b);
  margin-bottom: var(--space-5, 1.25rem);
}

/* Push actions to the bottom so uneven descriptions still align buttons */
.pr-card__actions {
  display: flex;
  gap: var(--space-3, 0.75rem);
  margin-top: auto;
  flex-wrap: wrap;
}

/* ----- Buttons ----- */

.pr-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: var(--space-2, 0.5rem) var(--space-4, 1rem);
  font-size: var(--font-size-sm, 0.875rem);
  font-weight: var(--font-weight-medium, 500);
  border-radius: var(--radius-md, 0.5rem);
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--transition-fast, 150ms cubic-bezier(0.4, 0, 0.2, 1)),
              color var(--transition-fast, 150ms cubic-bezier(0.4, 0, 0.2, 1)),
              border-color var(--transition-fast, 150ms cubic-bezier(0.4, 0, 0.2, 1));
}

.pr-btn--primary {
  color: #fff;
  background-color: var(--color-primary, #5558e3);
  border-color: var(--color-primary, #5558e3);
}

.pr-btn--primary:hover {
  background-color: var(--color-primary-dark, #4447c7);
  border-color: var(--color-primary-dark, #4447c7);
}

.pr-btn--ghost {
  color: var(--color-primary, #5558e3);
  border-color: var(--color-border-light, #e2e8f0);
  background-color: transparent;
}

.pr-btn--ghost:hover {
  border-color: var(--color-primary, #5558e3);
  background-color: var(--color-bg-secondary, #f8fafc);
}

/* ----- CTA Section ----- */

.pr-cta {
  max-width: var(--container-narrow, 960px);
  margin: 0 auto var(--space-20, 5rem);
  padding: var(--space-12, 3rem) var(--space-8, 2rem);
  background: var(--color-bg-secondary, #f8fafc);
  border: 1px solid var(--color-border-light, #e2e8f0);
  border-radius: var(--radius-2xl, 1.5rem);
  text-align: center;
}

.pr-cta__heading {
  font-size: var(--font-size-3xl, 1.875rem);
  font-weight: var(--font-weight-bold, 700);
  color: var(--color-text-primary, #0f172a);
  margin-bottom: var(--space-3, 0.75rem);
  letter-spacing: var(--letter-spacing-tight, -0.025em);
}

.pr-cta__text {
  font-size: var(--font-size-lg, 1.125rem);
  color: var(--color-text-secondary, #475569);
  margin-bottom: var(--space-8, 2rem);
}

.pr-cta__actions {
  display: flex;
  gap: var(--space-4, 1rem);
  justify-content: center;
  flex-wrap: wrap;
}

/* ----- Responsive ----- */

@media (max-width: 767px) {
  .pr-hero {
    padding: var(--space-10, 2.5rem) var(--space-4, 1rem) var(--space-8, 2rem);
  }

  .pr-hero h1 {
    font-size: var(--font-size-3xl, 1.875rem);
  }

  .pr-hero__subtitle {
    font-size: var(--font-size-base, 1rem);
  }

  .pr-gallery {
    grid-template-columns: 1fr;
    gap: var(--space-6, 1.5rem);
    padding-bottom: var(--space-10, 2.5rem);
  }

  .pr-cta {
    padding: var(--space-8, 2rem) var(--space-4, 1rem);
    margin-bottom: var(--space-10, 2.5rem);
  }

  .pr-cta__heading {
    font-size: var(--font-size-2xl, 1.5rem);
  }

  .pr-cta__actions {
    flex-direction: column;
    align-items: center;
  }

  .pr-cta__actions .btn {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

/* ----- Language switcher (no-JS <details> disclosure) ----- */

.pr-lang {
  position: relative;
}

.pr-lang__btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  padding: 0.5rem 0.85rem;
  font-size: var(--font-size-sm, 0.875rem);
  font-weight: var(--font-weight-medium, 500);
  color: var(--color-text-secondary, #475569);
  background: var(--color-bg-primary, #fff);
  border: 1px solid var(--color-border-light, #e2e8f0);
  border-radius: var(--radius-md, 0.5rem);
  list-style: none;
  user-select: none;
}

/* Hide the native disclosure triangle across engines */
.pr-lang__btn::-webkit-details-marker { display: none; }
.pr-lang__btn::marker { content: ""; }

.pr-lang__btn:hover {
  color: var(--color-text-primary, #0f172a);
  border-color: var(--color-primary, #5558e3);
}

.pr-lang__code { letter-spacing: 0.02em; }

.pr-lang__menu {
  position: absolute;
  right: 0;
  top: calc(100% + 0.4rem);
  z-index: 50;
  min-width: 180px;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--color-bg-primary, #fff);
  border: 1px solid var(--color-border-light, #e2e8f0);
  border-radius: var(--radius-md, 0.5rem);
  box-shadow: var(--shadow-lg, 0 10px 15px -3px rgb(0 0 0 / 0.1));
}

.pr-lang__item {
  display: block;
  padding: 0.5rem 0.65rem;
  border-radius: var(--radius-sm, 0.375rem);
  font-size: var(--font-size-sm, 0.875rem);
  color: var(--color-text-secondary, #475569);
  text-decoration: none;
}

.pr-lang__item:hover {
  background: var(--color-bg-secondary, #f8fafc);
  color: var(--color-text-primary, #0f172a);
}

.pr-lang__item.is-active {
  color: var(--color-primary, #5558e3);
  font-weight: var(--font-weight-semibold, 600);
}