/* 宣传片页面：深色放映厅里放一块 16:9 明亮画面；界面尺寸跟随舞台宽度（--u = 舞台宽 1%） */
* { box-sizing: border-box; }
html, body { margin: 0; height: 100%; overflow: hidden; background: #0b1622; }
body { font-family: "HarmonyOS Sans SC", "MiSans", "PingFang SC", "Microsoft YaHei UI", "Microsoft YaHei", "Noto Sans SC", sans-serif; color: #fff; }
.film {
  position: fixed; inset: 0; display: grid; place-items: center;
  background: radial-gradient(ellipse at 50% 40%, #1b3550 0%, #0b1622 70%);
}
.film-stage {
  --u: 19.2px;
  position: relative; overflow: hidden; background: #fff;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, .05), 0 30px 90px rgba(0, 0, 0, .5);
}
.film-stage canvas { position: absolute; inset: 0; display: block; width: 100%; height: 100%; }
.film[data-state="playing"]:not(.ui-on) .film-stage { cursor: none; }
.film button { font-family: inherit; color: inherit; }

/* ---------- 封面：播放按钮位于标志处，学科图标环绕它转动 ---------- */
.film-poster {
  position: absolute; inset: 0; border: 0; padding: 0; margin: 0; background: transparent; cursor: pointer;
}
.film-play-big {
  position: absolute; left: 50%; top: 34.26%; width: calc(var(--u) * 11.6); aspect-ratio: 1; transform: translate(-50%, -50%);
  display: grid; place-items: center; border-radius: 50%;
  background: linear-gradient(140deg, #1fb5a0 0%, #2f7de1 55%, #7c5ce0 100%);
  box-shadow: 0 calc(var(--u) * .5) 0 rgba(20, 47, 70, .18), 0 calc(var(--u) * 1.2) calc(var(--u) * 3) rgba(47, 125, 225, .35);
  transition: transform .25s cubic-bezier(.3, 1.6, .5, 1);
}
.film-play-big::before, .film-play-big::after {
  content: ""; position: absolute; inset: 0; border-radius: 50%; border: calc(var(--u) * .35) solid rgba(47, 125, 225, .45);
  animation: film-ring 2.2s ease-out infinite;
}
.film-play-big::after { animation-delay: 1.1s; }
.film-play-big svg { width: 42%; height: 42%; margin-left: 8%; fill: #fff; filter: drop-shadow(0 calc(var(--u) * .15) 0 rgba(20, 47, 70, .25)); }
.film-poster:hover .film-play-big, .film-poster:focus-visible .film-play-big { transform: translate(-50%, -50%) scale(1.07); }
.film-poster:focus-visible { outline: none; }
.film-poster-note {
  position: absolute; left: 50%; bottom: 4.6%; transform: translateX(-50%); white-space: nowrap;
  padding: .5em 1.3em; border-radius: 999px; font-size: calc(var(--u) * 1.3); font-weight: 800; color: #3d5266;
  background: rgba(255, 255, 255, .9); box-shadow: 0 calc(var(--u) * .25) calc(var(--u) * 1) rgba(20, 47, 70, .12);
}
.film.is-loading .film-play-big svg { opacity: 0; }
.film.is-loading .film-play-big::before {
  inset: 30%; border-color: #fff transparent #fff transparent; border-width: calc(var(--u) * .45); animation: film-spin .8s linear infinite;
}
.film:not([data-state="poster"]) .film-poster { display: none; }
@keyframes film-ring { from { transform: scale(1); opacity: 1; } to { transform: scale(1.55); opacity: 0; } }
@keyframes film-spin { to { transform: rotate(360deg); } }

/* ---------- 右上角：进入网站 ---------- */
.film-home {
  position: absolute; top: 2.6%; right: 1.6%; padding: .45em 1.1em; border-radius: 999px; text-decoration: none;
  font-size: calc(var(--u) * 1.05); font-weight: 800; color: #142f46; background: rgba(255, 255, 255, .88);
  box-shadow: 0 calc(var(--u) * .2) calc(var(--u) * .8) rgba(20, 47, 70, .15); transition: opacity .3s, transform .2s;
}
.film-home:hover { transform: translateY(-2px); }
.film[data-state="playing"]:not(.ui-on) .film-home { opacity: 0; pointer-events: none; }

/* ---------- 底部控制条 ---------- */
.film-controls {
  position: absolute; left: 0; right: 0; bottom: 0; padding: calc(var(--u) * 3) calc(var(--u) * 1.6) calc(var(--u) * .9);
  background: linear-gradient(rgba(8, 18, 30, 0), rgba(8, 18, 30, .6)); transition: opacity .3s;
  pointer-events: none;
}
.film-controls > * { pointer-events: auto; }
.film[data-state="playing"]:not(.ui-on) .film-controls { opacity: 0; }
.film[data-state="playing"]:not(.ui-on) .film-controls > * { pointer-events: none; }
.film[data-state="poster"] .film-controls, .film[data-state="frozen"] .film-controls, .film.no-ui .film-controls,
.film.no-ui .film-home, .film.no-ui .film-poster, .film.no-ui .film-end { display: none; }
/* 结尾只保留行动按钮，控制条不再盖住它们；方向键仍可跳转 */
.film[data-state="ended"] .film-controls { display: none; }
.film-track { position: relative; padding: calc(var(--u) * .55) 0; cursor: pointer; touch-action: none; outline: none; }
.film-segs { display: flex; gap: 3px; }
.film-seg { position: relative; height: calc(var(--u) * .38); min-height: 5px; border-radius: 99px; overflow: hidden; background: rgba(255, 255, 255, .32); transition: height .15s; }
.film-track:hover .film-seg, .film-track:focus-visible .film-seg { height: calc(var(--u) * .55); }
.film-seg i { position: absolute; inset: 0; transform-origin: left; transform: scaleX(0); background: linear-gradient(90deg, #5fd4ff, #9b8cff 50%, #ff7ab8); }
.film-tip {
  position: absolute; bottom: 120%; transform: translateX(-50%); white-space: nowrap; pointer-events: none;
  padding: .35em .8em; border-radius: 8px; font-size: calc(var(--u) * .95); font-weight: 800; color: #142f46; background: #fff;
}
.film-row { display: flex; align-items: center; gap: calc(var(--u) * .9); margin-top: calc(var(--u) * .35); }
.film-row button {
  display: grid; place-items: center; width: calc(var(--u) * 2.9); height: calc(var(--u) * 2.9); min-width: 34px; min-height: 34px;
  border: 0; border-radius: 50%; cursor: pointer; background: rgba(255, 255, 255, .14); transition: background .2s, transform .2s;
}
.film-row button:hover { background: rgba(255, 255, 255, .28); transform: scale(1.06); }
.film-row svg { width: 52%; height: 52%; fill: #fff; }
.film-time { font-size: calc(var(--u) * 1.05); font-weight: 800; font-variant-numeric: tabular-nums; letter-spacing: .02em; }
.film-chapter { padding: .3em .9em; border-radius: 999px; font-size: calc(var(--u) * .95); font-weight: 800; background: rgba(255, 255, 255, .16); }
.film-spacer { flex: 1; }
.film [data-icon] { display: none; }
.film[data-state="playing"] [data-icon="pause"], .film:not([data-state="playing"]) [data-icon="play"] { display: block; }
.film.is-muted [data-icon="muted"], .film:not(.is-muted) [data-icon="sound"] { display: block; }

/* ---------- 结尾行动按钮 ---------- */
.film-end {
  position: absolute; left: 50%; top: 87.8%; transform: translate(-50%, -50%) translateY(20%); display: flex; gap: calc(var(--u) * .9);
  opacity: 0; pointer-events: none; transition: opacity .5s, transform .5s cubic-bezier(.3, 1.5, .5, 1);
}
.film[data-state="ended"] .film-end { opacity: 1; pointer-events: auto; transform: translate(-50%, -50%); }
.film-btn {
  display: inline-flex; align-items: center; gap: .4em; padding: .7em 1.5em; border: 0; border-radius: 999px; cursor: pointer; white-space: nowrap;
  font-size: calc(var(--u) * 1.35); font-weight: 900; text-decoration: none; transition: transform .2s, box-shadow .2s;
}
.film-btn:hover { transform: translateY(-3px); }
.film-btn.primary {
  color: #fff; background: linear-gradient(90deg, #2f7de1, #7c5ce0 55%, #e0457b);
  box-shadow: 0 calc(var(--u) * .3) 0 rgba(20, 47, 70, .18), 0 calc(var(--u) * .8) calc(var(--u) * 2) rgba(124, 92, 224, .35);
}
.film-btn.ghost { color: #142f46 !important; background: #fff; box-shadow: inset 0 0 0 2px rgba(20, 47, 70, .14), 0 calc(var(--u) * .3) 0 rgba(20, 47, 70, .1); }

@media (prefers-reduced-motion: reduce) {
  .film-play-big::before, .film-play-big::after { animation: none; }
}