:root{color-scheme:light;--paper:#f3f1e9;--ink:#363e33;--muted:#707464;--line:#d6d3c6;--copper:#68664c}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--ink);font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif}
a{color:inherit;text-decoration:none}
header,footer{display:flex;justify-content:space-between;align-items:center;gap:20px;max-width:1324px;margin:auto}
header{padding:28px 0;border-bottom:1px solid var(--line);font-size:13px}
.brand{font-family:"Songti SC","SimSun",serif;font-size:26px;letter-spacing:4px}
main{max-width:1150px;margin:38px auto 60px;display:grid;grid-template-columns:minmax(0,1.12fr) minmax(0,1fr);gap:64px;align-items:start}
.screen{background:#e6e3d9;padding:20px 24px}
.screen-heading,.screen-footer{display:flex;justify-content:space-between;align-items:center;gap:14px;font-size:12px}
.screen-heading{padding-bottom:14px}.screen-footer{padding-top:14px;color:#626858;font-size:11px}
.player{position:relative;max-width:100%;margin:auto;width:min(100%,calc(70vh * .5625));aspect-ratio:9/16}
video{display:block;width:100%;height:100%;object-fit:contain;background:#e6e3d9}
.loading{position:absolute;bottom:58px;left:16px;right:16px;background:rgba(243,241,233,.95);padding:14px 16px;font-size:12px;border:1px solid var(--line)}
[hidden]{display:none!important}
.loading p{margin:0 0 8px}progress{width:100%;height:5px;accent-color:var(--copper)}
.selection{padding-top:5px}
.eyebrow{font-size:10px;letter-spacing:3px;color:var(--muted);margin:0 0 20px}
h1{font-family:"Songti SC","SimSun",serif;font-size:48px;font-weight:400;line-height:1.3;letter-spacing:2px;margin:0}
.intro{font-size:13px;line-height:1.9;color:var(--muted);margin:20px 0 24px}
.choices{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.choice{display:flex;text-align:left;align-items:center;gap:12px;border:1px solid var(--line);padding:8px;background:transparent;color:var(--ink);cursor:pointer;min-width:0;font:inherit}
.choice img{width:40px;height:70px;object-fit:cover}
.choice strong{font-size:13px;font-weight:500;display:block}.choice small{font-size:10px;color:var(--muted);display:block;margin-top:6px}
.choice[aria-pressed=true]{border-color:var(--copper);background:#e8e6d9;box-shadow:inset 0 0 0 1px var(--copper)}
.choice:hover{background:#e8e6df}
button:focus-visible,a:focus-visible{outline:2px solid var(--copper);outline-offset:4px}
.description{font-size:12px;line-height:1.8;color:var(--muted);min-height:44px;margin:16px 0}
.download{width:100%;padding:15px 18px;background:var(--copper);color:white;border:0;cursor:pointer;text-align:left;font:inherit;font-size:13px}
.download:disabled{opacity:.7;cursor:wait}
.download-status{font-size:12px;color:var(--muted);line-height:1.7;margin:10px 0}
.retry{border:1px solid var(--copper);padding:10px 14px;margin-top:12px;background:transparent;cursor:pointer;color:var(--ink)}
.reference{display:inline-block;font-size:12px;color:var(--muted);margin-top:22px}
footer{border-top:1px solid var(--line);padding:24px 0;font-size:10px;letter-spacing:1px;color:var(--muted)}
@media(max-width:1400px){header,footer{margin-left:4vw;margin-right:4vw}main{margin-left:6vw;margin-right:6vw;gap:5vw}}
@media(max-width:760px){header{padding:20px 0}.brand{font-size:22px}main{display:flex;flex-direction:column;gap:28px;margin:22px 5vw 36px}.screen,.selection{width:100%}.screen{padding:14px 16px}.player{width:min(100%,calc(60vh * .5625))}h1{font-size:36px}.intro br{display:none}.choices{grid-template-columns:1fr 1fr}.choice{gap:10px}.choice img{height:62px;width:35px}.description{min-height:0}.eyebrow{margin-bottom:12px}footer{line-height:1.7}}