[data-feature-hall]{--hall-paper:var(--theme-surface,#fff);--hall-soft:var(--theme-soft,#f5f5f3);--hall-line:var(--theme-line,#e6e6e6);--hall-ink:var(--theme-ink,#191919);--hall-muted:var(--theme-muted,#686868);--hall-accent:var(--theme-accent,#37695b);--hall-shade:rgba(0,0,0,.14);--hall-ring:rgba(0,0,0,.06);--hall-radius:12px}
html[data-theme=dark] [data-feature-hall]{--hall-shade:rgba(0,0,0,.7);--hall-ring:rgba(255,255,255,.08)}
.feature-opening{display:grid;gap:20px;padding-block:clamp(20px,3vh,36px) 0;box-sizing:border-box}
.page-features[data-feature-hall] .demos-intro{padding:0;max-width:1280px;width:calc(100% - 112px);margin-inline:auto}
.page-features[data-feature-hall] .feature-overview{padding:0;min-height:0;max-width:1280px;width:calc(100% - 112px);margin-inline:auto}
.page-features[data-feature-hall] .feature-overview video{display:block;width:100%;height:auto;aspect-ratio:16/9;border-radius:var(--hall-radius)}

/* 影厅：观众站在环前，正对面的卡片推近播放，两侧的卡片随角度变斜、变小、变虚 */
.feature-hall{position:relative;height:clamp(460px,48vw,700px);margin:8px 0 48px;overflow:hidden;touch-action:pan-y;cursor:grab;user-select:none;-webkit-user-select:none;outline:none;scroll-margin-top:var(--site-header-height)}
.feature-hall.is-dragging{cursor:grabbing}
.feature-hall:focus-visible{box-shadow:inset 0 0 0 2px var(--hall-line)}
.hall-edge{position:absolute;top:0;bottom:0;width:12%;z-index:5;pointer-events:none;background:linear-gradient(to right,var(--theme-bg,#fff),transparent)}
.hall-edge.is-right{right:0;background:linear-gradient(to left,var(--theme-bg,#fff),transparent)}
.hall-edge.is-left{left:0}
.hall-scene{position:absolute;inset:0;perspective:var(--hall-p,600px);perspective-origin:50% 50%}
.hall-ring{position:absolute;left:50%;top:50%;width:0;height:0;transform-style:preserve-3d;will-change:transform}
.feature-hall.is-intro .hall-ring{transition:transform 1.4s cubic-bezier(.2,.7,.2,1)}
.hall-card{position:absolute;left:0;top:0;transform-style:preserve-3d;will-change:transform;backface-visibility:hidden}
.hall-card:not(.is-focus){cursor:pointer}
.hall-frame{position:relative;border-radius:var(--hall-radius);overflow:hidden;background:var(--hall-paper);box-shadow:0 40px 80px -30px var(--hall-shade),0 0 0 1px var(--hall-ring);will-change:filter}
.hall-bar{display:flex;align-items:center;gap:7px;height:30px;padding:0 12px;border-bottom:1px solid var(--hall-line);background:var(--hall-paper);font:12px/1 var(--sans);color:var(--hall-muted)}
.hall-bar i{width:8px;height:8px;border-radius:50%;background:var(--hall-line);display:inline-block}
.hall-bar strong{font-weight:500;color:var(--hall-ink);margin-left:5px}
.hall-pro{margin-left:auto;font-size:10px;letter-spacing:.06em;color:var(--hall-accent);border:1px solid currentColor;border-radius:4px;padding:1px 5px;line-height:1.3}
.hall-body{position:relative;overflow:hidden;background:var(--hall-soft)}
.hall-body img,.hall-body video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:50% 0;display:block;margin:0;border:0;border-radius:0}
.hall-body video{opacity:0;transition:opacity .4s}
.hall-card.is-focus .hall-body video.is-ready{opacity:1}
.hall-card.is-focus .hall-body img[data-fit=wide]{animation:hall-zoom 9s ease-in-out forwards}
.hall-card.is-focus .hall-body img[data-fit=tall]{animation:hall-pan 9s ease-in-out forwards}
@keyframes hall-zoom{from{transform:scale(1)}to{transform:scale(1.05)}}
@keyframes hall-pan{from{object-position:50% 0}to{object-position:50% 100%}}
.hall-progress{position:absolute;left:0;right:0;bottom:0;height:2px;background:var(--hall-line);opacity:0;transition:opacity .3s}
.hall-card.is-focus .hall-progress{opacity:1}
.hall-progress b{display:block;height:100%;width:0;background:var(--hall-accent)}
.hall-cap{margin:12px 2px 0;font:12.5px/1.5 var(--sans);color:var(--hall-muted)}
.hall-cap b{display:block;color:var(--hall-ink);font-weight:500;font-size:13.5px;margin-bottom:2px}
.hall-cap .hall-pro{margin-left:6px;vertical-align:1px;padding:0 4px}

/* 没有脚本或脚本未就绪：按顺序竖排，内容照样完整可读 */
.feature-hall:not(.is-ready){height:auto;overflow:visible;cursor:auto;touch-action:auto}
.feature-hall:not(.is-ready) .hall-edge{display:none}
.feature-hall:not(.is-ready) .hall-scene{position:static;perspective:none}
.feature-hall:not(.is-ready) .hall-ring{position:static;width:auto;height:auto;display:grid;gap:36px;max-width:880px;margin:0 auto;padding:0 24px;transform:none!important}
.feature-hall:not(.is-ready) .hall-card{position:static;width:auto!important;margin:0!important;transform:none!important;visibility:visible!important;opacity:1!important}
.feature-hall:not(.is-ready) .hall-body{height:auto!important;aspect-ratio:16/10}
.feature-hall:not(.is-ready) .hall-frame{filter:none!important}

@media(max-width:1100px){.page-features[data-feature-hall] .demos-intro,.page-features[data-feature-hall] .feature-overview{width:calc(100% - 64px)}}
@media(max-width:760px){
  .feature-opening{padding:0;gap:0}
  .page-features[data-feature-hall] .demos-intro{width:calc(100% - 40px);padding-block:32px 24px}
  .page-features[data-feature-hall] .feature-overview{width:calc(100% - 40px);padding-bottom:8px}
  .feature-hall{height:clamp(380px,118vw,520px);margin-bottom:32px}
  .hall-cap{font-size:12px}.hall-cap b{font-size:13px}
}
@media(prefers-reduced-motion:reduce){.hall-card.is-focus .hall-body img{animation:none!important}.feature-hall.is-intro .hall-ring{transition:none}}