/* =========================
   MVP Main Layout
   Single Window Application Layout
   ========================= */

/* === APP SHELL === */
.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: var(--color-background);
}

/* === APP HEADER === */
.app-header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  z-index: 100;
  position: sticky;
  top: 0;
}

.app-header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  height: var(--header-height);
}

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

.app-header__logo-text {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}

.app-header__logo-icon {
  width: 16px;
  height: 16px;
  background-color: var(--color-primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-xs);
}

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

/* === MAIN CONTENT AREA === */
.app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-3) var(--space-3);
  padding-bottom: 320px; /* Space for map section */
  gap: var(--space-3);
}

/* === THREE SECTION LAYOUT === */

/* 1. Data Selection Section (Top) */
.data-selection {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-1) var(--space-3);
}

.data-selection__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.data-selection__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.data-selection__icon {
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.data-selection__form {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr auto;
  gap: var(--space-4);
  align-items: end;
}

/* 2. Charts Section (Center) */
.charts-section {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 375px;
}

.charts-section__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-4);
}

.charts-section__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.charts-section__view-mode {
  display: flex;
  gap: var(--space-2);
}

.view-mode-toggle {
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  font-size: 12.6px;
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.view-mode-toggle:hover {
  background-color: var(--color-surface-hover);
}

.view-mode-toggle--active {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border-color: var(--color-primary);
}

.charts-section__content {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.charts-navigation {
  border-bottom: 1px solid var(--color-divider);
  padding: var(--space-4);
}

.charts-viewport {
  flex: 1;
  padding: 0;
  position: relative;
  min-height: 500px;
  overflow: visible;
}

/* 3. Map Section (Bottom) - Now contains Google Maps with tram animation */
.statistics-section {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 300px;
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 -2px 8px var(--color-shadow);
  z-index: 10;
}


/* === RESPONSIVE LAYOUT === */

/* Tablet Layout */
@media (max-width: 1024px) {
  .data-selection__form {
    grid-template-columns: 1fr;
    gap: var(--space-3);
  }
  
  .charts-section__header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-3);
  }
  
  .charts-section__view-mode {
    width: 100%;
    justify-content: flex-start;
  }
}

/* Mobile Layout */
@media (max-width: 768px) {
  .app-main {
    padding: var(--space-2);
    gap: var(--space-4);
  }
  
  .app-header__content {
    padding: 0 var(--space-2);
  }
  
  .app-header__logo-text {
    display: none;
  }
  
  .data-selection,
  .charts-section__content {
    padding: var(--space-2);
  }
  
  .charts-viewport {
    padding: 0;
    min-height: 400px;
  }
  
  .statistics-section__header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  /* Stack filters vertically on mobile */
  .data-selection div[style*="display: flex"][style*="gap: var(--space-16)"] {
    flex-direction: column !important;
    gap: var(--space-4) !important;
    align-items: flex-start !important;
  }
  
  .quick-filters,
  #chart-type-filters {
    flex-wrap: wrap;
    gap: var(--space-2);
  }
  
  .chart-type-filter {
    min-width: auto;
    font-size: var(--font-size-sm);
    padding: var(--space-1) var(--space-2);
  }
}

/* === STATE VARIATIONS === */

/* Loading State */
.app--loading .charts-viewport {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface-hover);
}

/* Error State */
.app--error .charts-viewport {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(209, 52, 56, 0.05);
  border: 2px dashed var(--color-error);
}

/* Empty State */
.app--empty .charts-viewport {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--color-surface-hover);
}