*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --color-bg: #f3f0ea;
  --color-text: #1a1a1a;
  --color-muted: rgba(26, 26, 26, 0.5);
  --color-accent: #f5a87a;
  --card-width: clamp(128px, 16vw, 188px);
  --card-aspect: 819 / 1024;
  --card-border: 1.5px;
  --card-radius: 14px;
  --card-shadow: 2.9px 2.9px 3px 0 rgba(26, 26, 26, 0.032);
  --card-shadow-active: 4.8px 4.8px 5px 0 rgba(26, 26, 26, 0.038);
  --transition: 0.4s cubic-bezier(0.34, 1.2, 0.64, 1);
}

html, body {
  height: 100%;
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.is-playing {
  overflow: hidden;
}

/* ── Play Backdrop：浅色蒙层 + 强模糊 + 颗粒感 ── */
.play-backdrop {
  position: fixed;
  inset: 0;
  z-index: 150;
  background: rgba(243, 240, 234, 0.1);
  backdrop-filter: blur(18px) saturate(1.05);
  -webkit-backdrop-filter: blur(18px) saturate(1.05);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.45s ease;
}

.play-backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.28;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 180px 180px;
}

body.is-playing .play-backdrop {
  opacity: 1;
  pointer-events: auto;
}

/* ── Bottom fade：米色渐变压住下叠，随滚动淡出 ── */
.bottom-fade {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(140px, 32vh, 280px);
  z-index: 40;
  pointer-events: none;
  background: linear-gradient(
    to top,
    rgba(243, 240, 234, 0.96) 0%,
    rgba(243, 240, 234, 0.72) 38%,
    rgba(243, 240, 234, 0.28) 72%,
    rgba(243, 240, 234, 0) 100%
  );
  opacity: 1;
  transition: opacity 0.2s ease;
  will-change: opacity;
}

body.is-playing .bottom-fade {
  opacity: 0 !important;
}

.gallery-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: clamp(1.25rem, 4vw, 2.5rem);
}

body.is-playing .gallery-page {
  pointer-events: none;
}

/* ── Header ── */
.gallery-header {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  margin-bottom: clamp(1.5rem, 5vh, 3rem);
}

.gallery-header__back {
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 0.2s;
}

.gallery-header__back:hover {
  opacity: 0.6;
}

.gallery-header__back-icon {
  font-size: 1rem;
}

.gallery-header__title {
  font-size: clamp(1.25rem, 3vw, 1.75rem);
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: center;
  padding-bottom: 0.35rem;
  border-bottom: 1.5px solid var(--color-text);
}

.gallery-header__badge {
  justify-self: end;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  border: 1.5px solid var(--color-text);
  padding: 0.35rem 0.75rem;
  border-radius: 0;
  box-shadow: 3px 3px 0 0 var(--color-text);
}

/* ── Card Fan (deck → fan) ── */
.gallery-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52vh;
  padding-bottom: 0.5rem;
}

.decks-root {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(1.25rem, 3.5vh, 2.25rem);
}

.deck-section {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.deck-section__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-muted);
}

.card-fan {
  position: relative;
  width: min(860px, 96vw);
  min-height: calc(var(--card-width) * 1024 / 819 + 72px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-fan--deck {
  perspective: 1400px;
  transform-style: preserve-3d;
  outline: none;
}

.card-fan--deck:focus-visible {
  outline: 1.5px dashed var(--color-text);
  outline-offset: 14px;
}

.card-fan--deck.is-unfolding {
  pointer-events: none;
}

.video-card {
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--card-width);
  aspect-ratio: var(--card-aspect);
  border: var(--card-border) solid var(--color-text);
  border-radius: var(--card-radius);
  background: #ffffff;
  box-shadow: var(--card-shadow);
  cursor: pointer;
  transform-origin: 50% 80%;
  transform: translate(-50%, -50%);
  will-change: transform;
  backface-visibility: hidden;
  overflow: hidden;
}

.card-fan--deck.is-unfolded .video-card:not(.video-card--playing) {
  transition:
    transform 360ms cubic-bezier(0.34, 1.2, 0.64, 1),
    box-shadow 280ms cubic-bezier(0.34, 1.2, 0.64, 1);
}

.video-card__media {
  position: relative;
  width: 100%;
  height: 100%;
  aspect-ratio: var(--card-aspect);
  background: #ffffff;
  line-height: 0;
}

.video-card__thumb {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: contain;
  pointer-events: none;
  user-select: none;
}

.video-card__player {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #000;
}

.video-card__player[hidden] {
  display: none;
}

.video-card__player iframe {
  width: 100%;
  height: 100%;
  border: none;
}

.video-card--hovered:not(.video-card--playing) {
  box-shadow: var(--card-shadow-active);
}

/* 播放：居中放大，不受背景模糊影响 */
.video-card--playing {
  z-index: 200 !important;
  box-shadow: none;
  cursor: default;
  filter: none;
  isolation: isolate;
  border-radius: calc(var(--card-radius) * 1.35);
  overflow: hidden;
  transform-origin: center center !important;
}

/* ── Footer ── */
.gallery-footer {
  position: relative;
  z-index: 50;
  text-align: center;
  padding-top: clamp(2rem, 5vh, 3.5rem);
  padding-bottom: 1rem;
}

.gallery-footer__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text);
  background: var(--color-accent);
  border: var(--card-border) solid var(--color-text);
  padding: 0.3rem 0.85rem;
  box-shadow: 3px 3px 0 0 var(--color-text);
  margin-bottom: 0.75rem;
}

.gallery-footer__title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.gallery-footer__hint {
  font-size: 0.75rem;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ── Responsive：手机端横向轻叠 ── */
@media (max-width: 768px) {
  :root {
    --card-width: clamp(96px, 22vw, 140px);
    --card-radius: 12px;
    --card-shadow: 1.9px 1.9px 2.5px 0 rgba(26, 26, 26, 0.03);
    --card-shadow-active: 2.9px 2.9px 4px 0 rgba(26, 26, 26, 0.036);
  }

  .card-fan {
    width: min(640px, 96vw);
    min-height: calc(var(--card-width) * 1024 / 819 + 48px);
  }

  .video-card {
    top: 50%;
    transform-origin: 50% 80%;
  }
}

@media (max-width: 640px) {
  .gallery-header {
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
  }

  .gallery-header__title {
    grid-column: 1 / -1;
    order: -1;
  }

  .gallery-header__badge {
    justify-self: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .video-card,
  .card-fan--deck.is-unfolded .video-card:not(.video-card--playing) {
    transition-duration: 0.01ms !important;
  }
}