/* css/layout.css */

/* App Shell Layout */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh; /* For mobile browsers */
}

/* Header */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-4);
  z-index: var(--z-nav);
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--glass-border);
  transition: transform var(--transition-normal);
}

.app-header.hidden {
  transform: translateY(-100%);
}

.logo-container {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.logo-container img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
}

.logo-container h1 {
  font-size: var(--text-xl);
  font-weight: var(--font-extrabold);
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Main Content Area */
.app-main {
  flex: 1;
  padding-top: 64px; /* Header height */
  padding-bottom: 80px; /* Bottom Nav height */
  overflow-y: auto;
  overflow-x: hidden;
  scroll-behavior: smooth;
  position: relative;
}

/* Section Management */
.view-section {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  padding: var(--space-4);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}

.view-section.active {
  display: block;
  animation: viewFadeIn var(--transition-normal) forwards;
}

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

/* Bottom Navigation (Mobile First) */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 80px; /* Safe area inclusive */
  padding-bottom: env(safe-area-inset-bottom);
  background: var(--glass-bg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  align-items: center;
  z-index: var(--z-nav);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 60px;
  height: 100%;
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-icon {
  position: relative;
  transition: transform var(--transition-spring);
}

.nav-item svg {
  width: 24px;
  height: 24px;
  stroke-width: 2px;
}

.nav-text {
  font-size: 10px;
  font-weight: var(--font-semibold);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.nav-item.active {
  color: var(--primary);
}

.nav-item.active .nav-icon {
  transform: translateY(-2px);
}

/* Indicator dot for active item */
.nav-item::after {
  content: '';
  position: absolute;
  top: 6px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background-color: var(--primary);
  opacity: 0;
  transform: scale(0);
  transition: opacity var(--transition-spring), transform var(--transition-spring);
}

.nav-item.active::after {
  opacity: 1;
  transform: scale(1);
}

/* Desktop Sidebar (Media Query) */
@media (min-width: 768px) {
  .bottom-nav {
    display: none;
  }
  
  .app-container {
    flex-direction: row;
  }
  
  .app-sidebar {
    width: 260px;
    height: 100vh;
    position: sticky;
    top: 0;
    border-right: 1px solid var(--border-color);
    background: var(--bg-surface);
    display: flex;
    flex-direction: column;
    padding: var(--space-4) 0;
    z-index: var(--z-nav);
  }
  
  .app-main {
    padding-top: 0;
    padding-bottom: 0;
    padding: var(--space-8);
  }
  
  .app-header {
    display: none; /* Hide mobile header, or integrate into main content */
  }
  
  .view-section {
    max-width: 1000px;
    padding: 0;
  }
}

/* Containers */
.container {
  width: 100%;
  margin: 0 auto;
}

/* Grid Layouts */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }

@media (max-width: 600px) {
  .grid-cols-3, .grid-cols-2 {
    grid-template-columns: 1fr;
  }
}

/* Horizontal Scroll Container */
.scroll-x {
  display: flex;
  overflow-x: auto;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  scrollbar-width: none; /* Firefox */
  -ms-overflow-style: none;  /* IE and Edge */
  scroll-snap-type: x mandatory;
}
.scroll-x::-webkit-scrollbar {
  display: none;
}
.scroll-item {
  flex: 0 0 80%;
  scroll-snap-align: center;
}
@media (min-width: 600px) {
  .scroll-item { flex: 0 0 300px; scroll-snap-align: start; }
}

/* Section Titles */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: var(--space-4);
  margin-top: var(--space-6);
}

.section-header h2 {
  font-size: var(--text-xl);
  margin: 0;
}

.link-all {
  font-size: var(--text-sm);
  color: var(--primary);
  font-weight: var(--font-medium);
}
.link-all:hover {
  text-decoration: underline;
}