:root{--backdrop: #ffffff}*{box-sizing:border-box;margin:0;padding:0}html,body,#root{height:100%;width:100%}body{background:var(--backdrop);overflow:hidden;font-family:ui-sans-serif,system-ui,sans-serif;-webkit-font-smoothing:antialiased}.deck{position:fixed;top:0;right:0;bottom:0;left:0;background:var(--backdrop);cursor:default;-webkit-user-select:none;user-select:none}.slide{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;will-change:transform,opacity}.slide-media{max-width:100%;max-height:100%;width:auto;height:auto;object-fit:contain;display:block}.stage{position:relative;display:inline-block;max-width:100%;max-height:100%}.stage-bg{display:block;max-width:100%;max-height:100vh;width:auto;height:auto}.video-frame{position:absolute;display:flex;align-items:center;justify-content:center;overflow:hidden}.framed-video{width:100%;height:100%;object-fit:contain;border:none}.embed-wrap{width:100%;max-height:100%;border-radius:12px;overflow:hidden}.video-placeholder{width:100%;height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;border:3px dashed #c9ced6;border-radius:18px;background:#f5f6f8;color:#9aa1ac;text-align:center;padding:24px}.video-placeholder-icon{font-size:clamp(28px,4vw,48px);line-height:1;color:#b4bac4}.video-placeholder-text{font-size:clamp(16px,2.2vw,26px);font-weight:600;color:#7c828d}.video-placeholder-hint{font-size:clamp(11px,1.2vw,14px);color:#aeb4be}.video-placeholder-hint code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;background:#e9ebef;padding:1px 5px;border-radius:5px}.progress{position:fixed;bottom:18px;right:22px;display:flex;align-items:center;gap:12px;z-index:10;opacity:.55;transition:opacity .2s ease}.deck:hover .progress{opacity:.9}.progress-count{font-size:13px;font-variant-numeric:tabular-nums;letter-spacing:.02em;color:#6b7280}.progress-bar{width:120px;height:4px;border-radius:999px;background:#0000001a;overflow:hidden}.progress-fill{height:100%;border-radius:999px;background:#1960dc;transition:width .35s cubic-bezier(.16,1,.3,1)}@media (prefers-reduced-motion: reduce){.slide{transition:none!important}}