/* ============================================================
   LAYOUT.CSS - App Shell & Structural Layout
   Sakshi's Secret Garden
   ============================================================ */

/* ---- App Container ---- */
.app-container {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  overflow: hidden;
}

/* ---- App Header ---- */
.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-md);
  background-color: rgba(255, 248, 250, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: var(--z-sticky);
  transition: background-color var(--transition-normal),
              border-color var(--transition-normal);
  padding-top: env(safe-area-inset-top);
}

[data-theme="dark"] .app-header {
  background-color: rgba(26, 18, 22, 0.88);
}

.header-left,
.header-right {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.header-left {
  flex: 1;
  min-width: 0;
}

.header-center {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.header-right {
  flex: 1;
  justify-content: flex-end;
  min-width: 0;
}

.header-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-bold);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-logo {
  font-family: var(--font-handwriting);
  font-size: var(--text-xl);
  color: var(--accent);
  letter-spacing: 0.02em;
}

.header-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-circle);
  color: var(--text-secondary);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
}

.header-btn:hover {
  background-color: var(--accent-translucent);
  color: var(--accent);
}

.header-btn:active {
  transform: scale(0.92);
}

.header-btn svg,
.header-btn .icon {
  width: 22px;
  height: 22px;
}

/* ---- Bottom Navigation (Mobile) ---- */
.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-around;
  background-color: rgba(255, 248, 250, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-top: 1px solid var(--border);
  z-index: var(--z-sticky);
  padding-bottom: env(safe-area-inset-bottom);
  transition: background-color var(--transition-normal),
              border-color var(--transition-normal),
              transform var(--transition-normal);
}

[data-theme="dark"] .app-nav {
  background-color: rgba(26, 18, 22, 0.92);
}

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

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  padding: var(--space-xs) var(--space-sm);
  min-width: 56px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast), opacity var(--transition-fast);
  position: relative;
  -webkit-tap-highlight-color: transparent;
}

.nav-item .nav-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-fast);
}

.nav-item .nav-icon svg,
.nav-item .nav-icon .icon {
  width: 24px;
  height: 24px;
}

.nav-item .nav-label {
  font-size: var(--text-xs);
  font-weight: var(--weight-medium);
  line-height: 1;
  transition: color var(--transition-fast);
}

.nav-item:hover {
  color: var(--text-secondary);
}

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

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

.nav-item.active .nav-icon {
  transform: scale(1.1);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 24px;
  height: 3px;
  background-color: var(--accent);
  border-radius: 0 0 3px 3px;
}

/* Nav badge for notification count */
.nav-item .nav-badge {
  position: absolute;
  top: 2px;
  right: calc(50% - 18px);
  min-width: 16px;
  height: 16px;
  padding: 0 4px;
  font-size: 10px;
  font-weight: var(--weight-bold);
  line-height: 16px;
  text-align: center;
  color: #fff;
  background-color: var(--danger);
  border-radius: 8px;
}

/* ---- Main Content ---- */
.main-content {
  flex: 1;
  width: 100%;
  max-width: var(--max-content-width);
  margin: 0 auto;
  padding: calc(var(--header-height) + var(--space-md)) var(--space-md) calc(var(--nav-height) + var(--space-lg) + env(safe-area-inset-bottom));
  padding-top: calc(var(--header-height) + env(safe-area-inset-top) + var(--space-md));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  will-change: scroll-position;
}

.main-content.no-header {
  padding-top: var(--space-md);
}

.main-content.no-nav {
  padding-bottom: var(--space-lg);
}

.main-content.full-width {
  max-width: 100%;
}

/* ---- Sidebar (Tags/Filters Panel) ---- */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(74, 53, 64, 0.3);
  z-index: var(--z-overlay);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal),
              visibility var(--transition-normal);
}

.sidebar-overlay.visible {
  opacity: 1;
  visibility: visible;
}

[data-theme="dark"] .sidebar-overlay {
  background-color: rgba(0, 0, 0, 0.5);
}

.sidebar {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: var(--sidebar-width);
  max-width: 85vw;
  background-color: var(--bg-elevated);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-modal);
  transform: translateX(100%);
  transition: transform var(--transition-normal);
  display: flex;
  flex-direction: column;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-right: env(safe-area-inset-right);
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.sidebar-header h3 {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
}

.sidebar-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md) var(--space-lg);
}

.sidebar-footer {
  padding: var(--space-md) var(--space-lg);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ---- Page Containers ---- */
.page {
  width: 100%;
  min-height: calc(100vh - var(--header-height) - var(--nav-height));
  animation: pageEnter 0.4s ease both;
}

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

.page.page-exit {
  animation: pageExit 0.25s ease both;
}

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

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.page-header h1,
.page-header h2 {
  flex: 1;
  min-width: 0;
}

.page-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.page-section {
  margin-bottom: var(--space-2xl);
}

.page-section-title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

/* ---- Content Grids ---- */
.grid {
  display: grid;
  gap: var(--space-md);
}

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

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

/* ---- Container Utilities ---- */
.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-gap-sm {
  gap: var(--space-sm);
}

.flex-gap-md {
  gap: var(--space-md);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.stack-sm {
  gap: var(--space-sm);
}

.stack-lg {
  gap: var(--space-lg);
}

/* ============================================================
   Responsive Breakpoints
   ============================================================ */

/* ---- Tablet (768px+) ---- */
@media (min-width: 768px) {
  .app-header {
    padding: 0 var(--space-lg);
  }

  /* Side navigation on tablet */
  .app-nav {
    top: var(--header-height);
    bottom: 0;
    left: 0;
    right: auto;
    width: 72px;
    height: auto;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--space-md) 0;
    padding-top: calc(env(safe-area-inset-top) + var(--space-md));
    padding-bottom: env(safe-area-inset-bottom);
    border-top: none;
    border-right: 1px solid var(--border);
    gap: var(--space-xs);
  }

  .nav-item {
    width: 56px;
    min-width: auto;
    padding: var(--space-sm) var(--space-xs);
  }

  .nav-item.active::before {
    top: 50%;
    left: 0;
    right: auto;
    transform: translateY(-50%);
    width: 3px;
    height: 24px;
    border-radius: 0 3px 3px 0;
  }

  .main-content {
    padding: calc(var(--header-height) + var(--space-lg)) var(--space-lg) var(--space-2xl);
    padding-left: calc(72px + var(--space-lg));
  }

  .sidebar {
    width: 320px;
    max-width: 320px;
  }

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

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

/* ---- Desktop / Large Tablet (1024px+) ---- */
@media (min-width: 1024px) {
  .app-nav {
    width: 200px;
    align-items: flex-start;
    padding: var(--space-lg) var(--space-md);
  }

  .nav-item {
    flex-direction: row;
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    gap: var(--space-sm);
    border-radius: var(--radius-md);
  }

  .nav-item .nav-label {
    font-size: var(--text-sm);
  }

  .nav-item.active {
    background-color: var(--accent-translucent);
  }

  .nav-item.active::before {
    display: none;
  }

  .main-content {
    padding-left: calc(200px + var(--space-xl));
    padding-right: var(--space-xl);
  }

  .sidebar {
    width: 360px;
    max-width: 360px;
  }
}

/* ---- Landscape Adjustments ---- */
@media (orientation: landscape) and (max-height: 500px) {
  .app-header {
    height: 44px;
  }

  .app-nav {
    height: 48px;
  }

  .main-content {
    padding-top: calc(44px + var(--space-sm));
    padding-bottom: calc(48px + var(--space-md));
  }

  .nav-item .nav-label {
    display: none;
  }
}

/* ---- iOS Safe Areas ---- */
@supports (padding: max(0px)) {
  .app-header {
    padding-top: max(0px, env(safe-area-inset-top));
    height: calc(var(--header-height) + max(0px, env(safe-area-inset-top)));
  }

  .app-nav {
    padding-bottom: max(0px, env(safe-area-inset-bottom));
  }

  .main-content {
    padding-left: max(var(--space-md), env(safe-area-inset-left));
    padding-right: max(var(--space-md), env(safe-area-inset-right));
  }
}

@media (min-width: 768px) {
  @supports (padding: max(0px)) {
    .main-content {
      padding-left: max(calc(72px + var(--space-lg)), calc(72px + env(safe-area-inset-left)));
    }
  }
}

@media (min-width: 1024px) {
  @supports (padding: max(0px)) {
    .main-content {
      padding-left: max(calc(200px + var(--space-xl)), calc(200px + env(safe-area-inset-left)));
    }
  }
}