:root{
  color-scheme:dark;
  --ink:#f4ebd9;
  --muted:#c6bba7;
  --gold:#d4b57e;
  --paper:#e9dfc9;
  --line:rgba(226,213,188,.22);
}

*{box-sizing:border-box}
html,body{margin:0;width:100%;height:100%;overflow:hidden;background:#161710;color:var(--ink)}
body,button{font-family:'Dunhuang Sans','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif}
button{border:0;background:none;color:inherit;cursor:pointer;font-size:13px;min-height:42px;-webkit-tap-highlight-color:transparent}
button:disabled{cursor:wait;opacity:.58}
button:hover{color:#fff4d2}
button:focus-visible,summary:focus-visible{outline:2px solid var(--gold);outline-offset:5px}
button[hidden],[hidden]{display:none!important}
h1,h2,p{margin:0}
h1,h2{font-family:'Dunhuang Serif','Songti SC','Noto Serif CJK SC','SimSun',serif;font-weight:600}

#world{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}
#shade{position:fixed;inset:0;pointer-events:none;background:linear-gradient(180deg,rgba(12,13,9,.42),transparent 25%,transparent 67%,rgba(9,14,12,.66))}
#transition{position:fixed;inset:0;z-index:40;pointer-events:none;background:#131610;opacity:0;transition:opacity .55s}
#transition.cover{opacity:1}

#welcome{position:absolute;inset:0;z-index:50;display:flex;flex-direction:column;align-items:flex-start;justify-content:center;padding:6vw 8vw;background:linear-gradient(90deg,rgba(17,22,17,.8),rgba(17,22,17,.34) 50%,transparent 82%)}
.eyebrow{font-size:10px;line-height:1.7;letter-spacing:.22em;color:var(--gold);font-weight:500}
#welcome>.eyebrow{font-size:11px;letter-spacing:.3em}
#welcome h1{margin-top:20px;font-size:clamp(54px,6.5vw,105px);line-height:1.35;letter-spacing:.13em;text-shadow:0 3px 35px #1119}
.welcome-line{margin-top:14px;font-size:clamp(14px,1.25vw,20px);line-height:1.9;letter-spacing:.16em}
.welcome-action{display:flex;align-items:center;gap:25px;margin-top:42px}
.welcome-action>span{font-size:12px;letter-spacing:.12em;color:var(--muted)}
.primary{min-height:48px;padding:14px 28px;border:1px solid var(--paper);background:var(--paper);color:#24322b!important;letter-spacing:.1em}
.primary:hover{background:#fff1d9}
.welcome-foot{position:absolute;bottom:34px;font-size:11px;letter-spacing:.2em;color:#e6dccaad}

#topbar{position:absolute;top:0;left:0;right:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:22px 30px}
.brand{display:flex;align-items:center;gap:12px;font-family:'Dunhuang Serif','Songti SC',serif;font-size:19px;letter-spacing:.14em;text-shadow:0 2px 14px #0009}
.brand small{padding-left:12px;border-left:1px solid #d8ba8152;font-family:'Dunhuang Sans','Noto Sans SC',sans-serif;font-size:10px;font-weight:400;letter-spacing:.12em;color:#d8ccb8}
.seal{display:grid;place-items:center;width:31px;height:37px;border:1px solid #d8ba8166;background:#493b2040;color:#f1d6a6;font-size:21px}
.top-actions{display:flex;align-items:center;gap:10px}
.top-actions button{padding:0 10px;color:#e5decf;font-size:12px;text-shadow:0 2px 12px #000}
.top-actions button:hover{border-bottom:1px solid var(--gold)}

#view-tools{position:absolute;right:26px;bottom:31px;z-index:12;display:flex;gap:6px}
#view-tools button,.floating-control{min-height:38px;padding:0 15px;border:1px solid #d8c1984a;background:#111a17a8;backdrop-filter:blur(8px);font-size:11px}
#view-tools button[aria-pressed=true]{border-color:#d4b57e99;color:#f1d093}
.floating-control{position:absolute;left:28px;bottom:28px;z-index:14}

#guide{position:absolute;left:7%;bottom:62px;z-index:11;height:min(57vh,610px);width:auto;aspect-ratio:9/16;filter:drop-shadow(0 8px 13px #0004)}
#guide video,#guide-fallback{display:block;width:100%;height:100%;object-fit:contain;object-position:center bottom}
body.guide-still #guide{background:transparent}
body.guide-still #guide-video{position:absolute!important;left:0;bottom:0;width:1px!important;height:1px!important;opacity:0!important;pointer-events:none}
#guide-dismiss{position:absolute;top:12%;right:0;display:grid;place-items:center;width:29px;min-height:29px;border:1px solid #e7d8be70;border-radius:50%;background:#1320199c;font-size:19px;opacity:.62}
#guide:hover #guide-dismiss{opacity:1}
#captions{position:absolute;left:20%;right:20%;bottom:76px;z-index:13;text-align:center;pointer-events:none}
#caption{font-size:clamp(16px,1.4vw,23px);font-weight:500;line-height:1.9;color:#fff5e5;text-shadow:0 2px 4px #000,0 0 14px #000,1px 0 1px #000,-1px 0 1px #000}
#hint{position:absolute;left:50%;bottom:32px;z-index:9;transform:translateX(-50%);font-size:10px;letter-spacing:.1em;color:#eee7d5b8;white-space:nowrap;pointer-events:none;transition:opacity 1s}

dialog{width:min(650px,92vw);max-height:88vh;padding:0;border:1px solid #c5b18b55;background:#142019;color:var(--ink);box-shadow:0 30px 100px #0009}
dialog::backdrop{background:#07110ddd;backdrop-filter:blur(7px)}
.dialog-head{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:25px 30px;border-bottom:1px solid var(--line)}
.dialog-head h2{font-size:27px;line-height:1.5;letter-spacing:.07em}
.dialog-head button{width:44px;font-size:28px;font-weight:200}
#about-dialog>p{margin:19px 30px;font-size:14px;line-height:1.9;color:#d6cfbf}
#about-dialog .version{font-size:10px;letter-spacing:.1em;color:#ad9d82}
#toast{position:fixed;left:50%;bottom:88px;z-index:90;max-width:85vw;transform:translateX(-50%);padding:12px 20px;border:1px solid #d1b68080;background:#142019ed;font-size:12px;text-align:center}
#fallback{position:absolute;inset:40% 10%;z-index:100;padding:24px;background:#142019;text-align:center;font-size:16px;line-height:2}

@media(max-width:700px){
  #welcome{padding:9vw;background:linear-gradient(90deg,#141b15d9,#151b1478)}
  #welcome>.eyebrow{font-size:8px;letter-spacing:.14em}
  #welcome h1{font-size:48px;letter-spacing:.11em}
  .welcome-line{font-size:13px;letter-spacing:.06em}
  .welcome-action{flex-direction:column;align-items:flex-start;gap:14px;margin-top:32px}
  .welcome-action>span{font-size:10px}
  .welcome-foot{bottom:25px;font-size:9px;letter-spacing:.12em}
  #topbar{padding:11px 13px}
  .brand{gap:7px;font-size:15px}
  .brand small{display:none}
  .seal{width:24px;height:31px;font-size:18px}
  .top-actions{gap:0}
  .top-actions button{padding:0 7px;font-size:10px}
  #view-tools{right:10px;bottom:14px;flex-direction:column;align-items:flex-end;gap:3px}
  #view-tools button{min-height:31px;padding:0 9px;font-size:9px}
  .floating-control{left:11px;bottom:13px;min-height:35px;padding:0 11px;font-size:10px}
  #guide{left:0;bottom:44px;height:44vh}
  #guide-dismiss{top:8%;right:3%}
  #captions{left:8%;right:8%;bottom:58px}
  #caption{font-size:16px;line-height:1.75}
  #hint{bottom:56px;max-width:88vw;overflow:hidden;text-overflow:ellipsis;font-size:8px}
  .dialog-head{padding:19px 21px}
  .dialog-head h2{font-size:23px}
  #about-dialog>p{margin:16px 21px;font-size:13px}
}

@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}