/*
 * -----------------------------------------------------------------------------
 * Icy Math Official Website
 * File: components.css
 * Description: Buttons, cards, controls, FAQ, stores and other UI components.
 * -----------------------------------------------------------------------------
 */

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  min-width: max-content;
}

.brand__icon {
  width: 2.35rem;
  height: 2.35rem;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--chip-bg);
  border: 1px solid var(--chip-border);
  color: var(--accent);
  box-shadow: var(--shadow-inset);
  font-size: 1.2rem;
  overflow: hidden;
}

.brand__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.brand__name {
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.site-nav a {
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.site-nav a:hover {
  color: var(--text-primary);
  background: rgba(139, 92, 246, 0.10);
}

.menu-toggle {
  display: none;
  width: 2.6rem;
  height: 2.6rem;
  padding: 0.6rem;
  border: 0;
  border-radius: 0.85rem;
  background: transparent;
  color: var(--text-primary);
}

.menu-toggle span {
  display: block;
  width: 100%;
  height: 0.13rem;
  border-radius: 999px;
  background: currentColor;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.menu-toggle span + span {
  margin-top: 0.32rem;
}

.menu-toggle.is-active span:nth-child(1) {
  transform: translateY(0.45rem) rotate(45deg);
}

.menu-toggle.is-active span:nth-child(2) {
  opacity: 0;
}

.menu-toggle.is-active span:nth-child(3) {
  transform: translateY(-0.45rem) rotate(-45deg);
}

.drawer-scrim {
  display: none;
}

.segmented {
  display: inline-flex;
  align-items: center;
  padding: 0.18rem;
  border-radius: 999px;
  background: var(--control-bg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-inset);
}

.segmented__btn {
  border: 0;
  background: transparent;
  color: var(--text-secondary);
  padding: 0.72rem 0.9rem;
  border-radius: 999px;
  min-width: 2.6rem;
  line-height: 1;
  transition: background var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.segmented__btn:hover {
  color: var(--text-primary);
}

.segmented__btn.is-active {
  background: var(--control-active-bg);
  color: var(--text-primary);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3.2rem;
  padding: 0.85rem 1.2rem;
  border-radius: 999px;
  border: 1px solid var(--border-strong);
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
  gap: 0.55rem;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-soft);
}

.button--primary {
  background: var(--button-primary-bg);
  color: var(--button-primary-text);
  border-color: transparent;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-4);
}

.feature-card,
.update-card,
.screenshot-card,
.store-card,
.link-card,
.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
}

.feature-card {
  padding: var(--space-5);
  display: grid;
  gap: var(--space-4);
  min-height: 100%;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.feature-card__icon {
  width: 3rem;
  height: 3rem;
  border-radius: 1rem;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, rgba(124, 58, 237, 0.18), rgba(139, 92, 246, 0.08));
  color: var(--accent);
  font-weight: 800;
  font-size: 1.05rem;
  border: 1px solid rgba(139, 92, 246, 0.18);
}

.feature-card__title {
  font-size: 1.1rem;
  font-weight: 750;
}

.feature-card__text {
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.screenshots-grid {
  display: grid;
  justify-items: center;
}

.screenshots-carousel {
  width: min(100%, 520px);
  display: grid;
  justify-items: center;
  gap: var(--space-5);
}

.screenshots-carousel__stage {
  width: min(100%, 360px);
  display: grid;
  place-items: center;
  border-radius: 2.25rem;
  background:
    radial-gradient(circle at top right, rgba(139, 92, 246, 0.25), transparent 34%),
    linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.02));
  padding: clamp(0.8rem, 3vw, 1.2rem);
}

.screenshots-carousel__phone {
  width: min(100%, 360px);
  aspect-ratio: 360 / 780;
  position: relative;
}

.screenshots-carousel__viewport {
  position: absolute;
  inset: 0;
  overflow: hidden;
  background: transparent;
  z-index: 1;
}

.screenshots-carousel__slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transform: translateX(10%);
  transition: opacity 420ms ease, transform 420ms ease;
}

.screenshots-carousel__slide.is-active {
  opacity: 1;
  transform: translateX(0);
  z-index: 1;
}

.screenshots-carousel__device {
  width: 100%;
  height: 100%;
  display: block;
}

.screenshots-carousel__fallback {
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  padding: var(--space-5);
  color: var(--text-primary);
  background: linear-gradient(145deg, rgba(124, 58, 237, 0.16), rgba(15, 23, 42, 0.92));
  text-align: center;
  font-weight: 800;
}

.screenshots-carousel__frame {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  pointer-events: none;
  z-index: 2;
}

.screenshots-carousel__captions {
  position: relative;
  width: min(100%, 460px);
  min-height: 6.5rem;
  text-align: center;
}

.screenshots-carousel__caption {
  position: absolute;
  inset: 0;
  display: grid;
  align-content: start;
  gap: var(--space-2);
  opacity: 0;
  transform: translateY(0.65rem);
  transition: opacity 420ms ease, transform 420ms ease;
}

.screenshots-carousel__caption.is-active {
  opacity: 1;
  transform: translateY(0);
}

.screenshots-carousel__title {
  font-size: 1.25rem;
  font-weight: 800;
}

.screenshots-carousel__text {
  color: var(--text-secondary);
}

.screenshots-carousel__dots {
  display: inline-flex;
  gap: var(--space-2);
  justify-content: center;
}

.screenshots-carousel__dot {
  width: 0.72rem;
  height: 0.72rem;
  border: 0;
  border-radius: 999px;
  background: var(--border-strong);
  opacity: 0.45;
  transition: opacity var(--transition-fast), transform var(--transition-fast), background var(--transition-fast);
}

.screenshots-carousel__dot.is-active {
  background: var(--accent);
  opacity: 1;
  transform: scale(1.2);
}

@media (prefers-reduced-motion: reduce) {
  .screenshots-carousel__slide,
  .screenshots-carousel__caption {
    transition: none;
  }
}

.update-slot {
  min-height: 1px;
}

.update-card {
  padding: var(--space-6);
  display: grid;
  gap: var(--space-5);
}

.update-card__top {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  justify-content: space-between;
}

.update-card__title {
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  font-weight: 800;
}

.update-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.update-card__status {
  padding: 0.48rem 0.8rem;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--text-primary);
  border: 1px solid var(--chip-border);
  font-size: 0.9rem;
  font-weight: 700;
}

.update-card__message {
  color: var(--text-secondary);
}

.update-card__list {
  margin: 0;
  padding-left: 1.15rem;
  color: var(--text-secondary);
  display: grid;
  gap: 0.45rem;
}

.update-card__action {
  justify-self: start;
}

.faq-list {
  display: grid;
  gap: var(--space-3);
}

.faq-item {
  overflow: clip;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item[open] {
  border-color: var(--border-strong);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.10);
}

.faq-item summary {
  list-style: none;
  cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item__button {
  width: 100%;
  border: 0;
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.06), transparent);
  color: var(--text-primary);
  text-align: left;
  padding: var(--space-5);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  font-weight: 700;
}

.faq-item__button:hover {
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.12), rgba(139, 92, 246, 0.04));
}

.faq-item__question {
  flex: 1;
  min-width: 0;
  padding-right: 1rem;
}

.faq-item__caret {
  width: 0.75rem;
  height: 0.75rem;
  border-right: 0.14rem solid currentColor;
  border-bottom: 0.14rem solid currentColor;
  color: var(--text-primary);
  flex: none;
  transform: rotate(45deg) translateY(-0.15rem);
  transition: transform var(--transition-fast), color var(--transition-fast);
}

.faq-item[open] .faq-item__caret {
  color: var(--accent);
  transform: rotate(225deg) translate(-0.1rem, -0.1rem);
}

.faq-item__panel {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--text-secondary);
  line-height: 1.7;
}

.section__footnote {
  color: var(--text-muted);
}

.stores-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.store-card {
  padding: var(--space-5);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4);
  align-items: center;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.store-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.store-card--disabled {
  opacity: 0.72;
}

.store-card__icon {
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 0.95rem;
  display: grid;
  place-items: center;
  font-weight: 800;
  background: transparent;
  color: var(--accent);
  border: none;
  overflow: visible;
  padding: 0;
}

.store-card__icon img {
  width: var(--store-icon-image-size, 2.75rem);
  height: var(--store-icon-image-size, 2.75rem);
  object-fit: contain;
  display: block;
  background: transparent;
  border-radius: 0.8rem;
}

.store-card__icon--apk {
  --store-icon-image-size: 3.45rem;
}

.store-card__icon--googlePlay {
  --store-icon-image-size: 2.95rem;
}

.store-card__icon--galaxyStore {
  --store-icon-image-size: 4rem;
}

.store-card__icon--apkPure {
  --store-icon-image-size: 2.9rem;
}

.store-card__name {
  font-size: 1rem;
  font-weight: 800;
}

.store-card__hint {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.store-card__badge {
  margin-top: 0.4rem;
  display: inline-flex;
  align-items: center;
  width: max-content;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.82rem;
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.link-card {
  padding: var(--space-5);
  display: grid;
  gap: var(--space-3);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.link-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.link-card__name {
  font-size: 1rem;
  font-weight: 800;
}

.link-card__hint {
  color: var(--text-secondary);
  font-size: 0.94rem;
}

.link-card__icon {
  width: 2.6rem;
  height: 2.6rem;
  border-radius: 0.85rem;
  display: grid;
  place-items: center;
  background: var(--chip-bg);
  color: var(--accent);
  border: 1px solid var(--chip-border);
}

.link-card__icon img {
  width: 1.75rem;
  height: 1.75rem;
  object-fit: contain;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: var(--space-6);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  align-items: center;
  justify-content: space-between;
}

.site-footer__copy {
  color: var(--text-muted);
}

.site-footer__privacy {
  color: var(--text-secondary);
  font-weight: 700;
}