/* Kai Shop — Frontend customer-facing styles
 * public/css/main.css
 * Loaded together with base.css on all shop pages.
 */

/* -------------------------------------------------------------------------
 * Top navigation
 * -------------------------------------------------------------------------
 */
.shop-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  height: 60px;
  padding-inline: var(--space-4);
  background: var(--card-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  color: var(--md-sys-color-on-surface);
  border-bottom: 1px solid var(--card-border);
  box-shadow: var(--card-shadow);
}
.shop-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--md-sys-typescale-title-large);
  font-weight: var(--md-sys-font-weight-bold);
  color: var(--md-sys-color-primary-strong);
  white-space: nowrap;
}
.shop-nav__mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--md-radius-medium);
  color: var(--md-sys-color-on-primary);
  background: var(--md-sys-color-primary);
  box-shadow: 0 4px 12px rgba(33,150,243,0.30);
}
.shop-nav__mark .icon { width: 19px; height: 19px; }

.shop-nav__logo {
  width: 36px;
  height: 36px;
  border-radius: var(--md-radius-medium);
  object-fit: contain;
}

.shop-nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.shop-nav__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--md-sys-color-on-surface-variant);
  transition: background-color var(--md-duration-short) var(--md-easing-standard);
}

.shop-nav__toggle:hover,
.shop-nav__toggle:focus-visible {
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface);
}

.shop-nav__cart {
  position: relative;
}

.shop-nav__cart-count {
  position: absolute;
  top: -2px;
  right: -2px;
  display: grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  padding-inline: 4px;
  font-size: var(--md-sys-typescale-label-small);
  font-weight: var(--md-sys-font-weight-bold);
  color: var(--md-sys-color-on-error);
  background-color: var(--md-sys-color-error);
  border-radius: var(--md-radius-full);
}

/* -------------------------------------------------------------------------
 * Product grid
 * ------------------------------------------------------------------------- */
.shop-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-3);
}

/* -------------------------------------------------------------------------
 * Product card
 * ------------------------------------------------------------------------- */
.acg-card {
  position: relative;
  display: flex;
  flex-direction: column;
  background: var(--card-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  color: var(--md-sys-color-on-surface);
  border-radius: var(--md-radius-large);
  box-shadow: var(--card-shadow);
  border: 1px solid var(--card-border);
  overflow: hidden;
  opacity: 0;
  animation: fade-up var(--md-duration-long) var(--md-easing-emphasized) forwards;
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard),
              transform var(--md-duration-short) var(--md-easing-standard);
}

/* Staggered entrance — first screenful of cards eases in, rest appear together */
.shop-grid .acg-card:nth-child(1) { animation-delay: 40ms; }
.shop-grid .acg-card:nth-child(2) { animation-delay: 80ms; }
.shop-grid .acg-card:nth-child(3) { animation-delay: 120ms; }
.shop-grid .acg-card:nth-child(4) { animation-delay: 160ms; }
.shop-grid .acg-card:nth-child(5) { animation-delay: 200ms; }
.shop-grid .acg-card:nth-child(6) { animation-delay: 240ms; }
.shop-grid .acg-card:nth-child(7) { animation-delay: 280ms; }
.shop-grid .acg-card:nth-child(8) { animation-delay: 320ms; }
.shop-grid .acg-card:nth-child(n+9) { animation-delay: 360ms; }

.acg-card:hover {
  box-shadow: var(--md-elevation-2);
  transform: translateY(-4px);
}

.acg-card:active {
  transform: scale(0.995) translateY(0);
}

.acg-card__media::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(0,0,0,0.25));
  pointer-events: none;
}
.acg-card__media {
  position: relative;
  aspect-ratio: 4 / 3;
  background-color: var(--md-sys-color-surface-variant);
  overflow: hidden;
}

.acg-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--md-duration-medium) var(--md-easing-standard);
}

.acg-card:hover .acg-card__media img {
  transform: scale(1.03);
}

.acg-card__badge {
  position: absolute;
  top: var(--space-2);
  left: var(--space-2);
}

.acg-card__body {
  display: flex;
  flex-direction: column;
  flex: 1 1 0%;
  gap: var(--space-1);
  padding: var(--space-3);
}

.acg-card__title {
  font-size: var(--md-sys-typescale-body-large);
  font-weight: var(--md-sys-font-weight-medium);
  line-height: var(--md-sys-line-height-headline);
  color: var(--md-sys-color-on-surface);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.acg-card__meta {
  font-size: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

.acg-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: auto;
  padding-top: var(--space-2);
}

.price-tag {
  font-size: var(--md-sys-typescale-title-medium);
  font-weight: var(--md-sys-font-weight-bold);
  color: var(--md-sys-color-primary-strong);
}

.price-tag--old {
  font-size: var(--md-sys-typescale-body-small);
  font-weight: var(--md-sys-font-weight-regular);
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: line-through;
}

/* -------------------------------------------------------------------------
 * Content panel
 * ------------------------------------------------------------------------- */
.panel {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
  border-radius: var(--md-radius-large);
  box-shadow: var(--md-elevation-1);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: var(--space-4);
}

.panel__title {
  font-size: var(--md-sys-typescale-headline-small);
  font-weight: var(--md-sys-font-weight-medium);
  margin-bottom: var(--space-4);
  color: var(--md-sys-color-on-surface);
}

/* -------------------------------------------------------------------------
 * Chip list
 * ------------------------------------------------------------------------- */
.chip-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}

.chip-list--scroll {
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: var(--space-1);
  scrollbar-width: none;
}

.chip-list--scroll::-webkit-scrollbar {
  display: none;
}

/* -------------------------------------------------------------------------
 * Shop filters (index toolbar)
 * ------------------------------------------------------------------------- */
.shop-filters {
  display: grid;
  gap: var(--space-3);
}
.shop-filters__tools {
  display: grid;
  gap: var(--space-3);
}
.shop-filters__search {
  display: flex;
  gap: var(--space-2);
}
.shop-filters__search .input {
  flex: 1 1 0%;
  min-width: 0;
}
.shop-filters__sort {
  display: flex;
  align-items: center;
}
.shop-filters__sort .select {
  width: 100%;
}

@media (min-width: 768px) {
  .shop-filters {
    grid-template-columns: auto 1fr;
    align-items: center;
    gap: var(--space-4);
  }
  .shop-filters__tools {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: var(--space-3);
  }
  .shop-filters__search {
    max-width: 480px;
  }
  .shop-filters__sort {
    justify-content: flex-end;
  }
  .shop-filters__sort .select {
    width: auto;
    min-width: 160px;
  }
}

/* -------------------------------------------------------------------------
 * Product detail
 * ------------------------------------------------------------------------- */
.product-detail {
  display: grid;
  gap: var(--space-4);
}
/* 面包屑跨整行置顶，使其与商品图片顶部对齐；下方图片与信息左右分栏，
   避免商品名称被挤到面包屑下方产生大段空白。 */
.product-detail > .breadcrumb {
  grid-column: 1 / -1;
}

.product-detail__gallery {
  border-radius: var(--md-radius-large);
  overflow: hidden;
  background-color: var(--md-sys-color-surface-container);
  box-shadow: var(--md-elevation-1);
}

.product-detail__gallery img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.product-detail__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.product-detail__name {
  font-size: var(--md-sys-typescale-headline-small);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}

.product-detail__desc {
  color: var(--md-sys-color-on-surface-variant);
  line-height: var(--md-sys-line-height-body);
}

/* -------------------------------------------------------------------------
 * Quantity selector
 * ------------------------------------------------------------------------- */
.quantity-selector {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--md-sys-color-outline);
  border-radius: var(--md-radius-full);
  overflow: hidden;
  background-color: var(--md-sys-color-surface);
}

.quantity-selector button,
.quantity-selector input {
  width: 40px;
  height: 40px;
  display: grid;
  place-items: center;
  background: transparent;
  border: none;
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}

.quantity-selector input {
  width: 56px;
  text-align: center;
  border-inline: 1px solid var(--md-sys-color-outline);
  appearance: textfield;
}

.quantity-selector input::-webkit-outer-spin-button,
.quantity-selector input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  appearance: none;
  margin: 0;
}

.quantity-selector button:hover {
  background-color: var(--md-sys-color-surface-variant);
}

.quantity-selector button:active {
  background-color: var(--md-sys-color-surface-container);
}

/* -------------------------------------------------------------------------
 * Checkout form
 * ------------------------------------------------------------------------- */
.checkout-form {
  display: grid;
  gap: var(--space-4);
}

.checkout-form__group {
  display: grid;
  gap: var(--space-2);
}

.checkout-form__label {
  font-size: var(--md-sys-typescale-body-small);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface-variant);
}

.checkout-form__summary {
  background-color: var(--md-sys-color-surface-container-high);
  border-radius: var(--md-radius-medium);
  padding: var(--space-4);
}

.checkout-form__row {
  display: flex;
  justify-content: space-between;
  padding-block: var(--space-2);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.checkout-form__row:last-child {
  border-bottom: none;
  font-weight: var(--md-sys-font-weight-bold);
  color: var(--md-sys-color-primary-strong);
}

/* -------------------------------------------------------------------------
 * Auth page (shared by login / register / forgot / reset)
 * ------------------------------------------------------------------------- */
.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  background:
    radial-gradient(80% 60% at 50% -10%, rgba(33,150,243,0.06), transparent 70%),
    var(--md-sys-color-background);
}

.auth-card {
  width: 100%;
  max-width: 420px;
  margin-inline: auto;
  color: var(--md-sys-color-on-surface);
  border-radius: var(--md-radius-extra-large);
  box-shadow: var(--md-elevation-3);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: var(--space-6);
  background-color: var(--md-sys-color-surface-container-high);
  animation: fade-up 0.5s var(--md-easing-emphasized) both;
}

.auth-card__header {
  text-align: center;
  margin-bottom: var(--space-6);
}

.auth-card__title {
  font-size: var(--md-sys-typescale-headline-small);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}

.auth-card__subtitle {
  font-size: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface-variant);
  margin-top: var(--space-1);
}

.auth-card__form {
  display: grid;
  gap: var(--space-4);
}

/* -------------------------------------------------------------------------
 * Order card
 * ------------------------------------------------------------------------- */
.order-card {
  display: grid;
  gap: var(--space-3);
  background-color: var(--md-sys-color-surface-container);
  border-radius: var(--md-radius-medium);
  box-shadow: var(--md-elevation-1);
  border: 1px solid var(--md-sys-color-outline-variant);
  padding: var(--space-4);
}

.order-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
}

.order-card__id {
  font-size: var(--md-sys-typescale-title-medium);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}

.order-card__date {
  font-size: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

.order-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  color: var(--md-sys-color-on-surface-variant);
}

.order-card__total {
  font-size: var(--md-sys-typescale-title-medium);
  font-weight: var(--md-sys-font-weight-bold);
  color: var(--md-sys-color-primary-strong);
  text-align: right;
}

/* -------------------------------------------------------------------------
 * Breadcrumb
 * ------------------------------------------------------------------------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface-variant);
}

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

.breadcrumb__item:not(:last-child)::after {
  content: '›';
  color: var(--md-sys-color-outline);
}

.breadcrumb__item--current {
  color: var(--md-sys-color-on-surface);
  font-weight: var(--md-sys-font-weight-medium);
}

/* -------------------------------------------------------------------------
 * Pagination
 * ------------------------------------------------------------------------- */
.pagination {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-6);
}

.pagination__btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding-inline: var(--space-3);
  font-size: var(--md-sys-typescale-label-large);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface-variant);
  background-color: var(--md-sys-color-surface-container);
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-radius-full);
  transition: background-color var(--md-duration-short) var(--md-easing-standard),
              color var(--md-duration-short) var(--md-easing-standard);
}

.pagination__btn:hover {
  background-color: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}

.pagination__btn[aria-current="page"],
.pagination__btn.is-active {
  color: var(--md-sys-color-on-primary);
  background-color: var(--md-sys-color-primary-strong);
  border-color: transparent;
}

.pagination__btn:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

/* -------------------------------------------------------------------------
 * Empty state
 * ------------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-10) var(--space-4);
  text-align: center;
  color: var(--md-sys-color-on-surface-variant);
}

.empty-state__icon {
  width: 96px;
  height: 96px;
  color: var(--md-sys-color-outline);
}

.empty-state__title {
  font-size: var(--md-sys-typescale-title-large);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}

.empty-state__action {
  margin-top: var(--space-2);
}

/* -------------------------------------------------------------------------
 * Toast / snackbar
 * ------------------------------------------------------------------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: var(--space-6);
  z-index: 200;
  transform: translateX(-50%) translateY(120%);
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  min-height: 48px;
  padding: var(--space-2) var(--space-4);
  color: var(--md-sys-color-inverse-on-surface);
  background-color: var(--md-sys-color-inverse-surface);
  border-radius: var(--md-radius-small);
  box-shadow: var(--md-elevation-3);
  font-size: var(--md-sys-typescale-body-medium);
  opacity: 0;
  transition: transform var(--md-duration-medium) var(--md-easing-emphasized),
              opacity var(--md-duration-medium) var(--md-easing-emphasized);
}

.toast.is-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast--success {
  color: var(--md-sys-color-on-success-container);
  background-color: var(--md-sys-color-success-container);
}

.toast--error {
  color: var(--md-sys-color-on-error-container);
  background-color: var(--md-sys-color-error-container);
}

/* -------------------------------------------------------------------------
 * Responsive breakpoints
 * ------------------------------------------------------------------------- */
@media (min-width: 768px) {
  .shop-nav {
    padding-inline: var(--space-6);
  }

  .shop-grid {
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--space-4);
  }

  .product-detail {
    grid-template-columns: 1fr 1fr;
  }

  .order-card {
    grid-template-columns: 1fr auto;
    align-items: center;
  }

  .order-card__total {
    text-align: right;
  }
}

@media (min-width: 1024px) {
  .shop-grid {
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-5);
  }

  .checkout-form {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: start;
  }

  .panel {
    padding: var(--space-6);
  }
}

/* -------------------------------------------------------------------------
 * Footer
 * ------------------------------------------------------------------------- */
.shop-footer {
  border-top: 1px solid var(--md-sys-color-outline-variant);
  padding-block: 20px;
  background: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
}
.shop-footer__inner {
  max-width: 1140px;
  margin-inline: auto;
  padding-inline: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.shop-footer__copy { margin: 0; }

/* -------------------------------------------------------------------------
 * Storefront layout - yiciyuan-style (category sidebar + search + grid)
 * ------------------------------------------------------------------------- */
.shop-main__inner {
  max-width: 1200px;
  margin-inline: auto;
}

.shop-layout {
  display: grid;
  grid-template-columns: 224px 1fr;
  gap: var(--space-6);
  align-items: start;
  padding-bottom: var(--space-8);
}

.shop-sidebar {
  position: sticky;
  top: calc(60px + var(--space-4));
  background: var(--card-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--card-border);
  border-radius: var(--md-radius-large);
  box-shadow: var(--card-shadow);
  padding: var(--space-3);
}
.shop-sidebar__title {
  font-size: var(--md-sys-typescale-title-small);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface-variant);
  padding: var(--space-2) var(--space-3);
  margin-bottom: var(--space-1);
}
.shop-sidebar__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.cat-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 11px var(--space-3);
  border: none;
  border-radius: var(--md-radius-medium);
  background: transparent;
  color: var(--md-sys-color-on-surface);
  font-size: var(--md-sys-typescale-body-medium);
  font-weight: var(--md-sys-font-weight-medium);
  text-align: left;
  cursor: pointer;
  transition: background-color var(--md-duration-short) var(--md-easing-standard),
              color var(--md-duration-short) var(--md-easing-standard);
}
.cat-item:hover { background: var(--md-sys-color-surface-container-high); }
.cat-item.is-active {
  background: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.shop-content { min-width: 0; }

.shop-hero {
  background: var(--card-bg);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid var(--card-border);
  border-radius: var(--md-radius-large);
  box-shadow: var(--card-shadow);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  position: relative;
  overflow: hidden;
}
.shop-hero__title {
  font-size: var(--md-sys-typescale-headline-small);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--space-4);
}
.shop-search { display: flex; gap: var(--space-2); }
.shop-search .input {
  flex: 1 1 0%;
  min-width: 0;
  height: 50px;
  font-size: var(--md-sys-typescale-body-large);
}
.shop-search .btn { height: 50px; padding-inline: var(--space-6); }

.shop-content__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}
.shop-content__heading { display: flex; align-items: baseline; gap: var(--space-2); flex-wrap: wrap; }
.shop-content__title {
  font-size: var(--md-sys-typescale-title-large);
  font-weight: var(--md-sys-font-weight-medium);
  color: var(--md-sys-color-on-surface);
}
.shop-content__count {
  font-size: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}
.shop-content__sort { display: flex; align-items: center; gap: var(--space-2); }
.shop-content__sort-label {
  display: inline-flex;
  align-items: center;
  white-space: nowrap;
  font-size: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}
.shop-content__sort .select { min-width: 150px; }

.shop-grid { margin-top: var(--space-1); }

@media (max-width: 880px) {
  .shop-layout { grid-template-columns: 1fr; gap: var(--space-4); }
  .shop-sidebar { position: static; padding: var(--space-2) var(--space-3); }
  .shop-sidebar__title { display: none; }
  .shop-sidebar__list { flex-direction: row; flex-wrap: wrap; }
  .cat-item { width: auto; padding: 8px var(--space-3); border-radius: var(--md-radius-full); }
  .shop-hero { padding: var(--space-4); }
}