/* ==========================================================================
   Global base styles
   ========================================================================== */

body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
  font-family: var(--font-family-base);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--line-height-base);
}

h1,
h2,
h3 {
  color: var(--color-white);
  font-weight: var(--fw-bold);
  line-height: 1.3;
}

h1 {
  font-size: var(--fs-h1);
  font-weight: var(--fw-extrabold);
}

h2 {
  font-size: var(--fs-h2);
  color: var(--color-heading-accent);
  font-weight: var(--fw-extrabold);
}

h3 {
  font-size: var(--fs-h3);
  color: var(--color-white);
  font-weight: var(--fw-bold);
}

p {
  margin-bottom: var(--paragraph-gap);
}

p:last-child {
  margin-bottom: 0;
}

a {
  transition: color var(--transition-base), opacity var(--transition-base);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--color-heading-accent);
  outline-offset: 3px;
}

/* Skip link */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 1000;
  padding: 0.75rem 1.25rem;
  background: var(--color-heading-accent);
  color: var(--color-text-on-light);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-card);
  transition: top var(--transition-base);
}

.skip-link:focus {
  top: 1rem;
}

/* Layout container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding-inline);
}

main {
  display: block;
  overflow-x: hidden;
}

body.no-scroll {
  overflow: hidden;
}

.page-section {
  padding-block: var(--section-gap);
}

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

.page-section__intro {
  color: var(--color-text-main);
  font-size: var(--fs-body);
  margin-top: var(--h2-text-gap);
}

.page-section__intro:first-of-type {
  margin-top: var(--h2-text-gap);
}

.page-section ul,
.page-section ol {
  margin-block: var(--paragraph-gap);
  padding-left: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.page-section ul {
  list-style: disc;
}

.page-section ol {
  list-style: decimal;
}

.page-section h3 {
  margin-top: calc(var(--section-gap) / 2);
  margin-bottom: var(--h3-text-gap);
}

.page-section h3:first-child {
  margin-top: 0;
}

.page-section a:not(.btn) {
  color: var(--color-heading-accent);
  text-decoration: underline;
}

.page-section a:not(.btn):hover {
  opacity: 0.8;
}

/* Contextual internal links (interlinking between pages) get their own
   distinct brand color so they stand out from the generic accent links
   used for headings, TOC, etc. */
.page-section a.content-link:not(.btn) {
  color: var(--color-accent-light);
  font-weight: var(--fw-semibold);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.page-section a.content-link:not(.btn):hover {
  color: var(--color-heading-accent);
  opacity: 1;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.9rem 1.75rem;
  font-family: var(--font-family-base);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-card);
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-base), opacity var(--transition-base), background var(--transition-base);
  border: 1px solid transparent;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: var(--gradient-cta);
  color: var(--color-text-on-light);
}

.btn--primary:hover {
  opacity: 0.92;
}

.btn--outline {
  background: transparent;
  border-color: var(--color-white);
  color: var(--color-white);
}

.btn--outline:hover {
  background: var(--color-white);
  color: var(--color-text-on-light);
}

.btn--block {
  width: 100%;
}

.download-row {
  display: grid;
  gap: var(--card-gap);
  grid-template-columns: 1fr;
  margin-top: var(--h2-text-gap);
}

.section-cta {
  margin-top: var(--section-gap);
  display: flex;
  justify-content: center;
}

/* Content-section image (must render uncropped) */
.section-image {
  width: 100%;
  height: auto;
  border-radius: var(--radius-card);
  margin-top: var(--h2-text-gap);
  margin-bottom: var(--h2-text-gap);
  object-fit: contain;
  background-color: var(--color-bg-dark);
}

/* Tables */
.data-table-wrap {
  width: 100%;
  overflow-x: auto;
  margin-block: var(--paragraph-gap);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-border-subtle);
}

.data-table {
  width: 100%;
  min-width: 480px;
  border-collapse: collapse;
  font-size: var(--fs-small);
}

.data-table caption {
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: var(--fw-semibold);
  color: var(--color-white);
  background-color: var(--color-bg-dark);
}

.data-table th,
.data-table td {
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border-subtle);
}

.data-table thead th {
  background-color: var(--color-bg-dark);
  color: var(--color-heading-accent);
  font-weight: var(--fw-semibold);
}

.data-table tbody tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.03);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  font-size: var(--fs-small);
  color: var(--color-text-main);
}

.breadcrumb a {
  color: var(--color-text-main);
}

.breadcrumb a:hover {
  color: var(--color-heading-accent);
}

.breadcrumb__current {
  color: var(--color-heading-accent);
}

/* Bonus grid (Bonus page) */
.bonus-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--card-gap);
  margin-top: var(--h2-text-gap);
}

.bonus-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  background-color: var(--color-bg-dark);
  border-radius: var(--radius-card);
  padding: var(--card-padding);
}

.bonus-card__media {
  border-radius: var(--radius-card);
  overflow: hidden;
}

.bonus-card__image {
  width: 100%;
  height: auto;
  object-fit: contain;
}

.bonus-card__title {
  margin: 0;
}

.bonus-card__text {
  color: var(--color-text-main);
  font-size: var(--fs-small);
  flex-grow: 1;
  margin: 0;
}

@media (min-width: 480px) {
  .bonus-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .bonus-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Android / iOS comparison block (App page) */
.platform-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: var(--card-gap);
  margin-top: var(--h2-text-gap);
}

.platform-card {
  min-width: 0;
  height: 100%;
  background-color: var(--color-bg-dark);
  border-radius: var(--radius-card);
  padding: var(--card-padding);
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.platform-card__icon {
  height: 4rem;
  width: auto;
  margin-inline: auto;
}

.platform-card__title {
  text-align: center;
  margin: 0;
}

.platform-card__text {
  color: var(--color-text-main);
  margin: 0;
}

.platform-card .data-table-wrap {
  margin-top: auto;
  min-width: 0;
  max-width: 100%;
}

.platform-card > .btn {
  margin-top: 0.5rem;
}

@media (min-width: 768px) {
  .platform-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

/* 404 page */
.not-found {
  padding-block: calc(var(--section-gap) * 2);
  min-height: 50dvh;
  display: flex;
  align-items: center;
}

.not-found__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}

.not-found__code {
  font-size: clamp(4rem, 12vw, 8rem);
  font-weight: var(--fw-extrabold);
  color: var(--color-heading-accent);
  line-height: 1;
  margin: 0;
}

.not-found__title {
  margin: 0;
}

.not-found__text {
  max-width: 32rem;
  color: var(--color-text-main);
}

/* Fade-in animation hook (opt-in via JS/IntersectionObserver) */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

@media (min-width: 480px) {
  .download-row {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 768px) {
  :root {
    --container-padding-inline: 2rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --container-padding-inline: 2.5rem;
  }
}