/* ============================================
   BicepsBD Layouts
   Page scaffolding, grids, responsive system
   ============================================ */

/* --- Page Scaffold --- */
.page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background-color: var(--color-bg);
}

.page__content {
  flex: 1;
  padding-top: var(--header-height);
  padding-bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom) + var(--space-4));
  width: 100%;
}

.page__content--no-bottom-nav {
  padding-bottom: 0;
}

/* Container */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

.container--narrow {
  max-width: 640px;
}

.container--wide {
  max-width: 1440px;
}

/* Full bleed (breaks out of container) */
.full-bleed {
  width: 100vw;
  margin-left: calc(-1 * var(--page-padding));
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

/* --- Section --- */
.section {
  padding-top: var(--section-gap);
}

.section:first-child {
  padding-top: var(--space-4);
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

.section-header__title {
  font-family: var(--font-heading);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text);
}

.section-header__action {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
  cursor: pointer;
  padding: var(--space-2);
  margin: calc(-1 * var(--space-2));
  border-radius: var(--radius-md);
  transition: background-color var(--duration-fast) var(--ease-out);
  min-height: 44px;
  display: flex;
  align-items: center;
}

.section-header__action:hover {
  background-color: var(--color-primary-light);
}

/* --- Product Grid --- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--card-gap);
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

/* --- Horizontal Scroll --- */
.hscroll {
  display: flex;
  gap: var(--space-3);
  overflow-x: auto;
  overflow-y: hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding-left: var(--page-padding);
  padding-right: var(--page-padding);
}

.hscroll::-webkit-scrollbar {
  display: none;
}

.hscroll > * {
  scroll-snap-align: start;
  flex-shrink: 0;
}

/* Carousel with peek */
.hscroll--peek {
  padding-right: var(--space-10);
}

/* --- Form Layout --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-row {
  display: grid;
  gap: var(--space-3);
}

.form-row--2 {
  grid-template-columns: 1fr 1fr;
}

/* --- Stack (vertical spacing) --- */
.stack {
  display: flex;
  flex-direction: column;
}

.stack--xs { gap: var(--space-1); }
.stack--sm { gap: var(--space-2); }
.stack--md { gap: var(--space-3); }
.stack--lg { gap: var(--space-4); }
.stack--xl { gap: var(--space-6); }

/* --- Cluster (horizontal wrapping) --- */
.cluster {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* --- Divider --- */
.divider {
  height: 1px;
  background-color: var(--color-divider);
  border: none;
  margin: var(--space-4) 0;
}

.divider--thick {
  height: 8px;
  background-color: var(--color-bg);
}

/* --- Sticky bottom bar --- */
.sticky-bottom {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sticky);
  background-color: var(--color-surface);
  border-top: 1.5px solid rgba(0, 0, 0, 0.12);
  box-shadow: var(--shadow-top);
  padding: var(--space-3) var(--page-padding);
  padding-bottom: calc(var(--space-3) + var(--safe-area-bottom));
  display: flex !important;
  align-items: center !important;
  justify-content: space-between !important;
  gap: var(--space-3);
}

.sticky-bottom__info {
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}

.sticky-bottom__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.sticky-bottom__value {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1.2;
}

.sticky-bottom .checkout-button,
.sticky-bottom #place_order,
.sticky-bottom .btn {
  margin-left: auto !important;
  min-width: 160px;
  flex: 0 0 auto;
}

/* Adjust when bottom nav is present */
.has-bottom-nav .sticky-bottom {
  bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom));
  padding-bottom: var(--space-3);
}

.has-bottom-nav .page__content {
  padding-bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom) + var(--space-4));
}

/* --- Overlay --- */
.sheet-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  background-color: var(--color-overlay);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out);
}

.sheet-overlay.active {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* --- Bottom Sheet --- */
.bottom-sheet {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: var(--z-sheet);
  background-color: var(--color-surface);
  border-radius: var(--radius-2xl) var(--radius-2xl) 0 0;
  max-height: 85vh;
  overflow-y: auto;
  transform: translateY(100%);
  visibility: hidden;
  pointer-events: none;
  transition: transform var(--duration-slow) var(--ease-out),
              visibility var(--duration-slow) var(--ease-out);
  padding-bottom: var(--safe-area-bottom);
}

.bottom-sheet.active {
  transform: translateY(0);
  visibility: visible;
  pointer-events: auto;
}

.bottom-sheet__handle {
  display: flex;
  justify-content: center;
  padding: var(--space-3) 0;
}

.bottom-sheet__handle::after {
  content: '';
  width: 36px;
  height: 4px;
  border-radius: var(--radius-full);
  background-color: var(--color-border);
}

.bottom-sheet__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-5) var(--space-4);
}

.bottom-sheet__title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 600;
}

.bottom-sheet__close {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  transition: background-color var(--duration-fast) var(--ease-out);
}

.bottom-sheet__close:hover {
  background-color: var(--color-bg);
}

.bottom-sheet__body {
  padding: 0 var(--space-5) var(--space-6);
}

/* --- Toast Container --- */
.toast-container {
  position: fixed;
  bottom: calc(var(--bottom-nav-height) + var(--safe-area-bottom) + var(--space-4));
  left: var(--page-padding);
  right: var(--page-padding);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  pointer-events: none;
}

/* --- Responsive Breakpoints --- */

/* Tablet (≥768px) */
@media (min-width: 768px) {
  .product-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
  }

  .form-row {
    grid-template-columns: 1fr 1fr;
  }

  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .hscroll {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .section-header {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }

  .product-grid {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

/* Desktop (≥1024px) */
@media (min-width: 1024px) {
  :root {
    --header-height: 72px;
  }

  .page__content {
    padding-bottom: var(--space-8);
  }

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

  .container {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  .hscroll {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  .section-header {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  .product-grid {
    padding-left: var(--space-8);
    padding-right: var(--space-8);
  }

  /* Hide bottom nav on desktop */
  .bottom-nav {
    display: none !important;
  }

  .has-bottom-nav .page__content {
    padding-bottom: var(--space-8);
  }

  .has-bottom-nav .sticky-bottom {
    bottom: 0;
    padding-bottom: calc(var(--space-3) + var(--safe-area-bottom));
  }

  .toast-container {
    bottom: var(--space-6);
    left: auto;
    right: var(--space-8);
    width: 360px;
  }

  /* Keep content readable on wide screens instead of stretching mobile sections edge to edge. */
  .section {
    width: min(calc(100% - (2 * var(--space-8))), var(--container-max));
    margin-left: auto;
    margin-right: auto;
  }

  .section-header,
  .section .product-grid,
  .section .hscroll {
    padding-left: 0;
    padding-right: 0;
  }

  .section .hscroll {
    overflow-x: visible;
  }

  .section .hscroll--peek {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    overflow: visible;
  }

  .section .hscroll--peek > * {
    min-width: 0;
  }

  /* Bottom sheets become side drawers on desktop */
  .bottom-sheet {
    right: 0;
    left: auto;
    width: 420px;
    height: 100vh;
    max-height: 100vh;
    border-radius: var(--radius-2xl) 0 0 var(--radius-2xl);
    transform: translateX(100%);
    top: 0;
    bottom: auto;
  }

  .bottom-sheet.active {
    transform: translateX(0);
  }
}

/* Large desktop (≥1440px) */
@media (min-width: 1440px) {
  .product-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

/* --- Mobile-Only Utilities --- */
@media (max-width: 767px) {
  .desktop-only {
    display: none !important;
  }
}

@media (min-width: 768px) {
  .mobile-only {
    display: none !important;
  }
}

@media (min-width: 1024px) {
  .tablet-down-only {
    display: none !important;
  }
}

@media (max-width: 1023px) {
  .desktop-up-only {
    display: none !important;
  }
}