/*!
  Copyright © 2026 上海瑞思智达科技有限公司 (Shanghai Ruisizhida Technology Co., Ltd.)
  Zhida · 星场开场。
*/

.nav:not(.scrolled) { background: #03070d; }

.opening {
  --opening-ink: #edf5fa;
  --opening-muted: #a3b4c4;
  --opening-progress: 0;
  position: relative;
  isolation: isolate;
  height: calc(100vh - 68px);
  height: calc(100svh - 68px);
  min-height: 540px;
  max-height: 1200px;
  overflow: hidden;
  color: var(--opening-ink);
  background: #03070d;
  color-scheme: dark;
}

.opening__stage,
.opening__canvas { position: absolute; inset: 0; width: 100%; height: 100%; }
.opening__stage {
  overflow: hidden;
  background: radial-gradient(ellipse at 50% 43%, #081824, #03070d 65%);
}
.opening.is-enhanced .opening__stage { cursor: grab; touch-action: pan-y; }
.opening.is-dragging .opening__stage { cursor: grabbing; }
.opening__stage:focus-visible { outline: 1px solid #86d9d6; outline-offset: -5px; border-radius: 0; }
.opening__canvas { display: block; opacity: 0; pointer-events: none; }
.opening.is-enhanced .opening__canvas { opacity: 1; }
.opening__fallback {
  /* 加载期间只显示深空底色；静态标志仅在动画不可用时启用。 */
  display: none;
  position: absolute;
  top: 43%;
  left: 50%;
  width: min(54vw, 42vh, 350px);
  height: auto;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 0 8px rgba(100,226,239,.3));
}
.opening.is-static .opening__fallback,
.opening-unavailable .opening__fallback { display: block; }
.opening.is-enhanced .opening__fallback { display: none; }
.opening::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(3,7,13,.28), transparent 25%, transparent 63%, rgba(3,7,13,.7));
}

.opening__bottom { position: absolute; z-index: 1; left: var(--gutter); right: var(--gutter); bottom: 42px; pointer-events: none; }
.opening__invitation { text-align: center; }
.opening__invitation p { font-size: clamp(18px, 1.7vw, 24px); font-weight: 400; letter-spacing: .06em; margin-bottom: 12px; }
.opening__explore { display: inline-flex; align-items: center; gap: 14px; min-height: 44px; color: var(--opening-muted); font-size: 14px; pointer-events: auto; }
.opening__explore span { display: inline-block; color: #edf5fa; transition: transform .25s ease; }
.opening__explore:hover { color: #fff; }
.opening__explore:hover span { transform: translateY(4px); }

.opening a:focus-visible { outline-color: #9beade; }
.opening__progress { position: absolute; z-index: 2; left: 0; right: 0; bottom: 0; height: 1px; background: rgba(165,190,210,.1); }
.opening__progress span { display: block; height: 100%; background: linear-gradient(90deg, transparent, #51b7b0 60%, #8dacf3); transform: scaleX(var(--opening-progress)); transform-origin: left; }
#home { scroll-margin-top: 68px; }
#home:focus { outline: none; }

@media (max-width: 720px) {
  .opening { min-height: 560px; }
  .opening__bottom { bottom: 36px; }
  .opening__invitation p { font-size: 18px; letter-spacing: .025em; }
}

@media (prefers-reduced-motion: reduce) {
  .opening__explore span { transform: none !important; }
  .opening__explore span { transition: none; }
}