/* Navigation Styles — Landing, category list, and activity list screens.
   All values use design tokens from shared/css/variables.css. */

/* ─── Base Body ─── */
.nav-body {
  background: var(--color-bg-gradient);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
  overflow-x: hidden;
}

/* ─── Head Bar ─── */
.head-bar {
  width: 100%;
  height: 60px;
  background: var(--color-bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(139, 92, 246, 0.06);
  flex-shrink: 0;
}

.head-bar__logo {
  height: 32px;
  width: auto;
  display: block;
  user-select: none;
  pointer-events: none;
}

/* ─── Decorative Background ─── */
.deco-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  overflow: hidden;
}

.deco-bg__dot {
  position: absolute;
  border-radius: var(--radius-full);
  opacity: 0.2;
  animation: nav-float 7s ease-in-out infinite;
}

.deco-bg__dot--1 {
  width: 140px;
  height: 140px;
  top: 5%;
  left: 3%;
  animation-duration: 7s;
}

.deco-bg__dot--2 {
  width: 100px;
  height: 100px;
  top: 15%;
  right: 4%;
  animation-duration: 9s;
  animation-direction: reverse;
}

.deco-bg__dot--3 {
  width: 60px;
  height: 60px;
  bottom: 8%;
  left: 5%;
  animation-duration: 6s;
}

.deco-bg__dot--4 {
  width: 45px;
  height: 45px;
  bottom: 20%;
  right: 6%;
  animation-duration: 8s;
  animation-direction: reverse;
}

.deco-bg__dot--5 {
  width: 70px;
  height: 70px;
  top: 50%;
  left: 2%;
  animation-duration: 10s;
}

/* Literacy deco colors */
.deco-bg--okuryazarlik .deco-bg__dot--1 { background: var(--color-deco-yellow); }
.deco-bg--okuryazarlik .deco-bg__dot--2 { background: var(--color-deco-pink); }
.deco-bg--okuryazarlik .deco-bg__dot--3 { background: var(--color-deco-blue); }
.deco-bg--okuryazarlik .deco-bg__dot--4 { background: var(--color-deco-green); }
.deco-bg--okuryazarlik .deco-bg__dot--5 { background: var(--color-deco-purple); }

/* Math deco colors */
.deco-bg--matematik .deco-bg__dot--1 { background: var(--color-deco-blue); }
.deco-bg--matematik .deco-bg__dot--2 { background: var(--color-deco-green); }
.deco-bg--matematik .deco-bg__dot--3 { background: var(--color-deco-blue); }
.deco-bg--matematik .deco-bg__dot--4 { background: var(--color-deco-yellow); }
.deco-bg--matematik .deco-bg__dot--5 { background: var(--color-deco-purple); }

/* Landing deco colors */
.deco-bg--landing .deco-bg__dot--1 { background: var(--color-deco-yellow); }
.deco-bg--landing .deco-bg__dot--2 { background: var(--color-deco-pink); }
.deco-bg--landing .deco-bg__dot--3 { background: var(--color-deco-blue); }
.deco-bg--landing .deco-bg__dot--4 { background: var(--color-deco-green); }
.deco-bg--landing .deco-bg__dot--5 { background: var(--color-deco-purple); }

@keyframes nav-float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(5deg); }
}

/* ─── Main Content Container ─── */
.nav-content {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 1100px;
  padding: var(--space-xl) var(--space-lg);
  padding-top: var(--space-lg);
}

/* ─── Inline Back Button ─── */
.nav-back-btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-bg-light);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
  transition: transform var(--duration-fast) var(--easing-smooth),
              box-shadow var(--duration-fast) var(--easing-smooth);
}

.nav-back-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-md);
}

.nav-back-btn:active {
  transform: scale(0.95);
}

.nav-back-btn:focus {
  outline: none;
}

.nav-back-btn:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* ─── Page Header ─── */
.nav-header {
  margin-bottom: var(--space-xxl);
}

.nav-header__row {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.nav-header__title {
  font-size: var(--font-size-xxl);
  font-weight: var(--font-weight-bold);
}

.nav-header__subtitle {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  /* Align with title text, offset by back button (44px) + gap */
  padding-left: calc(44px + var(--space-md));
}

/* ─── Landing — Domain Cards ─── */
.domain-cards {
  display: flex;
  gap: 20px;
  justify-content: center;
  align-items: stretch;
  max-width: 1000px;
  margin: 0 auto;
}

.domain-card {
  flex: 1;
  max-width: 420px;
  height: 220px;
  background: var(--color-bg-card);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  padding: var(--space-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: transform 120ms var(--easing-smooth),
              box-shadow 120ms var(--easing-smooth),
              border-color 120ms var(--easing-smooth);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  border: 3px solid transparent;
  cursor: pointer;
}

.domain-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(139, 92, 246, 0.2);
}

.domain-card:active {
  transform: scale(0.98);
  transition-duration: 120ms;
}

.domain-card:focus {
  outline: none;
}

.domain-card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.domain-card--okuryazarlik:hover {
  border-color: var(--color-correct);
}

.domain-card--matematik:hover {
  border-color: var(--color-sky-blue);
}

.domain-card--songs:hover {
  border-color: var(--color-encourage);
}

.domain-card--songs .domain-card__icon {
  background: none;
}

.domain-card__icon {
  width: 120px;
  height: 150px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.domain-card__icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.domain-card--okuryazarlik .domain-card__icon {
  background: none;
}

.domain-card--matematik .domain-card__icon {
  background: none;
}

.domain-card__text {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  text-align: left;
}

.domain-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.domain-card__subtitle {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  line-height: 1.4;
}

/* ─── Category List (Screen 2) ─── */
.category-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.category-card {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  height: 90px;
  background: var(--color-bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  padding: 0 var(--space-lg);
  cursor: pointer;
  border: none;
  text-decoration: none;
  color: var(--color-text);
  overflow: hidden;
  position: relative;
  transition: transform 120ms var(--easing-smooth),
              box-shadow 120ms var(--easing-smooth);
  width: 100%;
  text-align: left;
  font-family: var(--font-family);
}

.category-card:hover {
  transform: scale(1.02);
  box-shadow: var(--shadow-md);
}

.category-card:active {
  transform: scale(0.98);
}

.category-card:focus {
  outline: none;
}

.category-card:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

/* Left accent bar */
.category-card__accent {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
}

.category-card__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-left: var(--space-sm);
}

.category-card__icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.category-card__info {
  flex: 1;
  min-width: 0;
}

.category-card__title {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
  margin-bottom: 2px;
}

.category-card__desc {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.category-card__age {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  background: var(--color-bg-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  white-space: nowrap;
  flex-shrink: 0;
}

.category-card__arrow {
  font-size: 1.25rem;
  color: var(--color-text-light);
  flex-shrink: 0;
  opacity: 0.5;
  transition: opacity var(--duration-fast), transform var(--duration-fast);
}

.category-card:hover .category-card__arrow {
  opacity: 1;
  transform: translateX(4px);
}

/* ─── Activity List (Screen 3) ─── */
.activity-header {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

.activity-header__icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.activity-header__icon-img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.activity-header__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.activity-header__age {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  color: var(--color-primary);
  background: var(--color-bg-light);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-full);
  margin-left: auto;
}

.activity-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  max-width: 900px;
}

.activity-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
  border: none;
  background: none;
  font-family: var(--font-family);
  padding: var(--space-md);
  border-radius: var(--radius-lg);
  transition: transform 120ms var(--easing-smooth);
}

.activity-tile:hover {
  transform: scale(1.05);
}

.activity-tile:active {
  transform: scale(0.95);
}

.activity-tile:focus {
  outline: none;
}

.activity-tile:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: 2px;
}

.activity-tile__thumb {
  width: 240px;
  height: 240px;
  border-radius: var(--radius-md);
  background: #FFFFFF;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: box-shadow var(--duration-fast);
}

.activity-tile:hover .activity-tile__thumb {
  box-shadow: var(--shadow-md);
}

.activity-tile__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: var(--radius-md);
}

/* Fallback when thumbnail is missing */
.activity-tile__fallback {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #FFFFFF;
  border-radius: var(--radius-md);
}

.activity-tile__fallback-img {
  width: 60%;
  height: 60%;
  object-fit: contain;
  user-select: none;
  pointer-events: none;
}

.activity-tile__label {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  line-height: 1.3;
}

/* ─── Coming Soon Tile ─── */
.activity-tile--coming-soon {
  cursor: default;
  pointer-events: none;
}

.activity-tile__thumb-wrap {
  position: relative;
}

.activity-tile--coming-soon .activity-tile__thumb img,
.activity-tile--coming-soon .activity-tile__fallback {
  filter: grayscale(0.6) opacity(0.5);
}

.activity-tile__coming-soon-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.3);
  z-index: 1;
}

.activity-tile__coming-soon-badge {
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-sm);
  white-space: nowrap;
}

.activity-tile--coming-soon .activity-tile__label {
  color: var(--color-text);
}

/* ─── Skeleton Loading ─── */
@keyframes shimmer {
  0% { background-position: -400px 0; }
  100% { background-position: 400px 0; }
}

.skeleton {
  background: linear-gradient(90deg, var(--color-bg-light) 25%, #ece5ff 50%, var(--color-bg-light) 75%);
  background-size: 800px 100%;
  animation: shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-category {
  height: 90px;
  width: 100%;
  margin-bottom: var(--space-md);
}

.skeleton-tile {
  width: 140px;
  height: 140px;
}

/* ─── View Transitions ─── */
.view-enter {
  animation: viewFadeIn 150ms var(--easing-smooth) forwards;
}

@keyframes viewFadeIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ─── Error State ─── */
.nav-error {
  text-align: center;
  padding: var(--space-xxl) var(--space-lg);
}

.nav-error__message {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-light);
  margin-bottom: var(--space-lg);
}

.nav-error__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-primary);
  color: var(--color-text-on-primary);
  border: none;
  border-radius: var(--radius-full);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: transform var(--duration-fast);
}

.nav-error__btn:hover {
  transform: scale(1.05);
}

.nav-error__btn:active {
  transform: scale(0.95);
}