/* ============================================================
   微电影页 · 封面下拉解锁 + 主题色背景
   ============================================================ */

:root {
  --film-base: #08080a;
  --film-tint: #5c4a3d;   /* 兜底：视频主题色(暖棕 #B4957E)混入黑 */
  --film-ink: #f5f5f6;
  --film-ink-soft: rgba(245, 245, 246, 0.55);
}

html, body { height: 100%; }

body {
  margin: 0;
  background: #08080a;
  color: var(--film-ink);
  font-family: Georgia, "Times New Roman", "Noto Serif SC", "Songti SC", serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.locked { overflow: hidden; }

/* 主题色背景：由黑/白 + 视频主题色混合而成，做径向延展 */
.film-stage {
  --base: var(--film-base);
  --tint: var(--film-tint);
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.2rem;
  padding: calc(4.5rem + env(safe-area-inset-top, 0px)) 1.5rem
           calc(2rem + env(safe-area-inset-bottom, 0px));
  background:
    radial-gradient(90% 70% at 50% 34%, var(--tint) 0%, transparent 62%),
    var(--base);
  color: var(--film-ink);
  transition: background 0.8s ease;
}

/* ============ 封面（上拉解锁） ============ */
.cover {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(120% 90% at 50% 36%, #1a1714 0%, #08080a 64%);
  color: var(--film-ink);
  text-align: center;
  will-change: transform;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
}

.cover.dragging { transition: none; }
.cover:not(.dragging) { transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1); }

.cover.unlocked { transform: translateY(-101%); pointer-events: none; }

.cover__inner { padding: 0 1.5rem; }

.cover__back {
  position: absolute;
  top: calc(1.4rem + env(safe-area-inset-top, 0px));
  left: 1.5rem;
  z-index: 10;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", sans-serif;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--film-ink-soft);
  text-decoration: none;
  transition: color 0.3s ease;
}

.cover__back:hover { color: var(--film-ink); }

.cover__title {
  font-size: clamp(3rem, 12vw, 6.5rem);
  font-weight: 400;
  letter-spacing: 0.2em;
  margin-left: 0.2em;
  line-height: 1;
}

.cover__subtitle {
  margin-top: 2.4rem;
  font-size: 1rem;
  letter-spacing: 0.34em;
  color: var(--film-ink-soft);
}

.cover__handle {
  position: absolute;
  bottom: calc(2.6rem + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.9rem;
  cursor: grab;
  outline: none;
}

.cover__handle-line {
  width: 1px;
  height: 2.6rem;
  background: linear-gradient(to bottom, transparent, rgba(245, 245, 246, 0.6));
  animation: coverNudge 2.4s ease-in-out infinite;
}

.cover__handle-text {
  font-size: 0.78rem;
  letter-spacing: 0.5em;
  margin-left: 0.5em;
  color: var(--film-ink-soft);
}

@keyframes coverNudge {
  0%, 100% { opacity: 0.85; }
  50% { opacity: 0.35; }
}

.cover__hint {
  position: absolute;
  bottom: calc(1.3rem + env(safe-area-inset-bottom, 0px));
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.78rem;
  letter-spacing: 0.4em;
  margin-left: 0.4em;
  color: var(--film-ink);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.cover__hint.show { opacity: 1; }

/* ============ 导航（解锁后浮现） ============ */
.film-nav {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.9s ease 0.2s;
}
body.unlocked .film-nav { opacity: 1; pointer-events: auto; }

/* ============ 视频 ============ */
.film-frame {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: scale(1);
  will-change: transform, opacity;
  /* 暂停收缩 / 播放铺开 */
  transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1),
              opacity 0.4s ease;
}

.film-video {
  display: block;
  max-width: min(90vw, 1100px);
  max-height: 74vh;
  max-height: 74svh;
  width: auto;
  height: auto;
  cursor: pointer;
  background: #000;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}

.film-stage.paused .film-frame {
  transform: scale(0.82);
  opacity: 0.88;
}

.film-title {
  margin-top: 0.4rem;
  font-size: 1.3rem;
  letter-spacing: 0.24em;
  margin-left: 0.24em;
}

.film-hint {
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--film-ink-soft);
}

@media (max-width: 720px) {
  .film-video { max-height: 60vh; max-height: 60svh; }
}

@media (prefers-reduced-motion: reduce) {
  .cover, .cover:not(.dragging) { transition: none; }
  .cover__handle-line { animation: none; }
  .film-frame { transition: none; }
}