/**
 * Material 3 Layout Styles
 * 布局相关样式：AppBar、Navigation、响应式网格
 */

/* ===== Top App Bar ===== */
.app-bar {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  gap: var(--md-sys-space-2);
  height: var(--md-sys-layout-app-bar-height);
  padding: 0 var(--md-sys-space-2);
  background-color: var(--md-sys-color-surface);
  z-index: 100;
  transition: box-shadow var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.app-bar--scrolled {
  box-shadow: var(--md-sys-elevation-2);
  background-color: var(--md-sys-color-surface-container);
}

.app-bar__leading {
  display: flex;
  align-items: center;
}

.app-bar__title {
  flex: 1;
  font-size: var(--md-sys-typescale-title-large);
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-bar__title a {
  color: inherit;
  text-decoration: none;
}

.app-bar__actions {
  display: flex;
  align-items: center;
  gap: var(--md-sys-space-1);
}

/* Center Aligned App Bar */
.app-bar--center .app-bar__title {
  text-align: center;
}

/* Large App Bar */
.app-bar--large {
  flex-wrap: wrap;
  height: auto;
  min-height: var(--md-sys-layout-app-bar-height);
  padding-bottom: var(--md-sys-space-4);
}

.app-bar--large .app-bar__title {
  order: 1;
  width: 100%;
  padding: var(--md-sys-space-4) var(--md-sys-space-4) 0;
  font-size: var(--md-sys-typescale-headline-medium);
}

/* ===== Bottom Navigation Bar ===== */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  justify-content: space-around;
  height: var(--md-sys-layout-bottom-nav-height);
  padding-bottom: env(safe-area-inset-bottom, 0);
  background-color: var(--md-sys-color-surface-container);
  box-shadow: var(--md-sys-elevation-2);
  z-index: 100;
}

@media (min-width: 840px) {
  .bottom-nav {
    display: none;
  }
}

.bottom-nav__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--md-sys-space-1);
  flex: 1;
  padding: 12px 0 16px;
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  transition: color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.bottom-nav__item:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: -4px;
  border-radius: var(--md-sys-shape-corner-medium);
}

.bottom-nav__icon {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.bottom-nav__icon svg {
  width: 24px;
  height: 24px;
}

.bottom-nav__item:hover .bottom-nav__icon {
  background-color: var(--md-sys-color-on-surface);
  background-color: rgba(0, 0, 0, 0.08);
}

.bottom-nav__item.active .bottom-nav__icon {
  background-color: var(--md-sys-color-secondary-container);
}

.bottom-nav__item.active {
  color: var(--md-sys-color-on-surface);
}

.bottom-nav__item.active svg {
  color: var(--md-sys-color-on-secondary-container);
}

.bottom-nav__label {
  font-size: var(--md-sys-typescale-label-medium);
  font-weight: 500;
}

/* ===== Navigation Rail ===== */
.nav-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  display: none;
  flex-direction: column;
  align-items: center;
  width: var(--md-sys-layout-nav-rail-width);
  padding: var(--md-sys-space-3) 0;
  background-color: var(--md-sys-color-surface);
  z-index: 99;
}

@media (min-width: 840px) {
  .nav-rail {
    display: flex;
  }
}

.nav-rail__fab {
  margin-bottom: var(--md-sys-space-5);
}

.nav-rail__items {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--md-sys-space-3);
  flex: 1;
}

.nav-rail__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--md-sys-space-1);
  padding: 4px var(--md-sys-space-3);
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  transition: color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.nav-rail__item:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
  border-radius: var(--md-sys-shape-corner-medium);
}

.nav-rail__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 32px;
  border-radius: var(--md-sys-shape-corner-full);
  transition: background-color var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.nav-rail__icon svg {
  width: 24px;
  height: 24px;
}

.nav-rail__item:hover .nav-rail__icon {
  background-color: var(--md-sys-color-on-surface);
  background-color: rgba(0, 0, 0, 0.08);
}

.nav-rail__item.active .nav-rail__icon {
  background-color: var(--md-sys-color-secondary-container);
}

.nav-rail__item.active {
  color: var(--md-sys-color-on-surface);
}

.nav-rail__item.active svg {
  color: var(--md-sys-color-on-secondary-container);
}

.nav-rail__label {
  font-size: var(--md-sys-typescale-label-medium);
  font-weight: 500;
}

/* ===== Navigation Drawer ===== */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background-color: var(--md-sys-color-scrim);
  opacity: 0;
  visibility: hidden;
  z-index: 998;
  transition: opacity var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard),
              visibility var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
}

.drawer-backdrop.open {
  opacity: 0.32;
  visibility: visible;
}

.drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--md-sys-layout-drawer-width);
  max-width: calc(100vw - 56px);
  background-color: var(--md-sys-color-surface-container-low);
  border-radius: 0 var(--md-sys-shape-corner-large) var(--md-sys-shape-corner-large) 0;
  z-index: 999;
  transform: translateX(-100%);
  transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-standard);
  overflow-y: auto;
}

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

@media (min-width: 1200px) {
  .drawer--permanent {
    position: fixed;
    transform: translateX(0);
    border-radius: 0;
  }
  
  .app-content.with-drawer {
    padding-left: var(--md-sys-layout-drawer-width);
  }
}

.drawer__header {
  padding: var(--md-sys-space-5);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.drawer__title {
  font-size: var(--md-sys-typescale-title-large);
  color: var(--md-sys-color-on-surface);
}

.drawer__section {
  padding: var(--md-sys-space-3) 0;
}

.drawer__section-title {
  padding: var(--md-sys-space-2) var(--md-sys-space-5);
  font-size: var(--md-sys-typescale-title-small);
  font-weight: 500;
  color: var(--md-sys-color-on-surface-variant);
}

.drawer__item {
  display: flex;
  align-items: center;
  gap: var(--md-sys-space-3);
  padding: var(--md-sys-space-4) var(--md-sys-space-5);
  margin: 0 var(--md-sys-space-3);
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
  border-radius: var(--md-sys-shape-corner-full);
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.drawer__item:hover {
  background-color: var(--md-sys-color-on-surface);
  background-color: rgba(0, 0, 0, 0.08);
}

.drawer__item:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

.drawer__item.active {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
}

.drawer__item svg {
  width: 24px;
  height: 24px;
  flex-shrink: 0;
}

.drawer__item-text {
  flex: 1;
  font-size: var(--md-sys-typescale-label-large);
  font-weight: 500;
}

/* ===== Breadcrumbs ===== */
.breadcrumbs {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--md-sys-space-1);
  padding: var(--md-sys-space-3) 0;
  font-size: var(--md-sys-typescale-body-small);
  color: var(--md-sys-color-on-surface-variant);
}

.breadcrumbs a {
  color: var(--md-sys-color-on-surface-variant);
  text-decoration: none;
}

.breadcrumbs a:hover {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
}

.breadcrumbs__separator {
  color: var(--md-sys-color-outline);
}

.breadcrumbs__current {
  color: var(--md-sys-color-on-surface);
}

/* ===== Page Section ===== */
.section {
  margin-bottom: var(--md-sys-space-6);
}

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

.section__title {
  font-size: var(--md-sys-typescale-title-large);
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
}

.section__more {
  font-size: var(--md-sys-typescale-label-large);
  color: var(--md-sys-color-primary);
  text-decoration: none;
}

.section__more:hover {
  text-decoration: underline;
}

/* ===== Grid Layouts ===== */
.vod-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--md-sys-space-3);
}

@media (min-width: 480px) {
  .vod-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 600px) {
  .vod-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 840px) {
  .vod-grid {
    grid-template-columns: repeat(5, 1fr);
    gap: var(--md-sys-space-4);
  }
}

@media (min-width: 1024px) {
  .vod-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (min-width: 1280px) {
  .vod-grid {
    grid-template-columns: repeat(7, 1fr);
  }
}

/* Horizontal Rail (横向滑轨) */
.vod-rail {
  display: flex;
  gap: var(--md-sys-space-3);
  overflow-x: auto;
  padding-bottom: var(--md-sys-space-2);
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.vod-rail::-webkit-scrollbar {
  display: none;
}

.vod-rail .vod-card {
  flex-shrink: 0;
  width: 140px;
  scroll-snap-align: start;
}

@media (min-width: 600px) {
  .vod-rail .vod-card {
    width: 160px;
  }
}

@media (min-width: 840px) {
  .vod-rail {
    gap: var(--md-sys-space-4);
  }
  
  .vod-rail .vod-card {
    width: 180px;
  }
}

/* ===== Pagination ===== */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--md-sys-space-2);
  padding: var(--md-sys-space-5) 0;
}

.pagination__item {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--md-sys-space-3);
  font-size: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface);
  background-color: transparent;
  border: 1px solid var(--md-sys-color-outline-variant);
  border-radius: var(--md-sys-shape-corner-full);
  text-decoration: none;
  transition: all var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
}

.pagination__item:hover {
  background-color: var(--md-sys-color-surface-container-high);
  border-color: var(--md-sys-color-outline);
}

.pagination__item.active {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
  border-color: var(--md-sys-color-primary);
}

.pagination__item:disabled,
.pagination__item.disabled {
  opacity: 0.38;
  pointer-events: none;
}

.pagination__ellipsis {
  min-width: 40px;
  text-align: center;
  color: var(--md-sys-color-on-surface-variant);
}

/* ===== Hero Section ===== */
.hero {
  position: relative;
  width: 100%;
  background-color: var(--md-sys-color-surface-container);
  overflow: hidden;
}

.hero__backdrop {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: blur(20px);
  transform: scale(1.1);
  opacity: 0.3;
}

.hero__content {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--md-sys-space-4);
  padding: var(--md-sys-space-5);
  z-index: 1;
}

@media (min-width: 600px) {
  .hero__content {
    flex-direction: row;
    gap: var(--md-sys-space-6);
    padding: var(--md-sys-space-6);
  }
}

.hero__poster {
  flex-shrink: 0;
  width: 120px;
  aspect-ratio: 2 / 3;
  border-radius: var(--md-sys-shape-corner-medium);
  overflow: hidden;
  box-shadow: var(--md-sys-elevation-3);
}

@media (min-width: 600px) {
  .hero__poster {
    width: 180px;
  }
}

@media (min-width: 840px) {
  .hero__poster {
    width: 220px;
  }
}

.hero__poster img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__info {
  flex: 1;
  min-width: 0;
}

.hero__title {
  font-size: var(--md-sys-typescale-headline-medium);
  font-weight: 500;
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--md-sys-space-2);
}

@media (min-width: 840px) {
  .hero__title {
    font-size: var(--md-sys-typescale-headline-large);
  }
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--md-sys-space-2) var(--md-sys-space-4);
  font-size: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: var(--md-sys-space-3);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--md-sys-space-3);
}

/* ===== Empty State ===== */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--md-sys-space-8) var(--md-sys-space-4);
  text-align: center;
}

.empty-state__icon {
  width: 96px;
  height: 96px;
  margin-bottom: var(--md-sys-space-4);
  color: var(--md-sys-color-outline);
}

.empty-state__title {
  font-size: var(--md-sys-typescale-title-large);
  color: var(--md-sys-color-on-surface);
  margin-bottom: var(--md-sys-space-2);
}

.empty-state__description {
  font-size: var(--md-sys-typescale-body-medium);
  color: var(--md-sys-color-on-surface-variant);
  max-width: 400px;
}