:root{
  --ink: #0b0806;
  --paper: #e9dcc0;
  --gold: #c9a97c;
  --gold-dim: rgba(201,169,124,.34);
  --serif: "Songti SC", "STSong", "SimSun", "Noto Serif CJK SC", "Noto Serif SC", serif;
  --kai: "KaiTi", "Kaiti SC", "STKaiti", "Songti SC", "SimSun", serif;
}

*{ margin:0; padding:0; box-sizing:border-box; }

html, body{
  height:100%;
  background:var(--ink);
  overflow:hidden;
  color:var(--paper);
  font-family:var(--serif);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

#scene{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  display:block;
  touch-action:none;
  cursor:default;
  transition:opacity .9s ease;
  opacity:0;
}
#scene.ready{ opacity:1; }
#scene.pointing{ cursor:pointer; }
#scene.grabbing{ cursor:grabbing; }

/* 暗角與顆粒 */
.vignette{
  position:fixed; inset:0; pointer-events:none; z-index:2;
  background:
    radial-gradient(ellipse 74% 68% at 50% 47%, rgba(0,0,0,0) 45%, rgba(0,0,0,.3) 78%, rgba(0,0,0,.58) 100%);
  mix-blend-mode:multiply;
}
.grain{
  position:fixed; inset:0; pointer-events:none; z-index:3;
  opacity:.055;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.86' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode:overlay;
}

/* 頁眉 */
.brand{
  position:fixed; top:30px; left:38px; z-index:6;
  display:flex; align-items:center; gap:10px;
  font-size:12px; letter-spacing:.26em; color:rgba(233,220,192,.5);
  font-family:var(--kai);
  opacity:0; transition:opacity 1.6s ease 1.1s;
  pointer-events:none;
}
.brand.show{ opacity:1; }
.brand-dot{ opacity:.5; }

/* 右下角 */
.corner{
  position:fixed; right:38px; bottom:34px; z-index:6;
  font-family:var(--kai);
  font-size:12px; letter-spacing:.42em;
  color:rgba(233,220,192,.36);
  writing-mode:horizontal-tb;
  opacity:0; transition:opacity 1.8s ease 1.6s;
  pointer-events:none;
}
.corner.show{ opacity:1; }

/* 底部提示 */
.hint{
  position:fixed; left:50%; bottom:52px; z-index:6;
  transform:translateX(-50%);
  font-family:var(--kai);
  font-size:14px; letter-spacing:.34em;
  color:rgba(233,220,192,.62);
  text-shadow:0 0 18px rgba(0,0,0,.9);
  opacity:0; transition:opacity .55s ease;
  pointer-events:none; white-space:nowrap;
}
.hint.show{ opacity:1; }

.bottom-hint{
  position:fixed; left:50%; bottom:30px; z-index:6;
  transform:translateX(-50%);
  font-family:var(--kai);
  font-size:11px; letter-spacing:.22em;
  color:rgba(233,220,192,.4);
  opacity:0; transition:opacity .8s ease;
  pointer-events:none; white-space:nowrap;
}
.bottom-hint.show{ opacity:1; }

/* 載入 */
.loader{
  position:fixed; inset:0; z-index:9;
  background:#0b0806;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:22px;
  transition:opacity 1s ease;
}
.loader.done{ opacity:0; pointer-events:none; }
.loader-line{
  width:132px; height:1px; background:rgba(201,169,124,.18); overflow:hidden;
}
.loader-line i{
  display:block; height:100%; width:8%;
  background:linear-gradient(90deg, rgba(201,169,124,.25), var(--gold));
  transition:width .4s ease;
}
.loader p{
  font-family:var(--kai); font-size:12px; letter-spacing:.6em;
  color:rgba(233,220,192,.5); padding-left:.6em;
}

/* 開場 */
.intro{
  position:fixed; inset:0; z-index:8;
  display:flex; align-items:center; justify-content:center;
  background:
    radial-gradient(ellipse at 50% 44%, rgba(24,17,12,.78) 0%, rgba(6,4,3,.95) 58%, #040302 100%);
  opacity:1; transition:opacity 1.5s cubic-bezier(.4,0,.2,1), visibility 1.5s;
}
.intro.hide{ opacity:0; visibility:hidden; pointer-events:none; }

.intro-inner{
  display:flex; flex-direction:column; align-items:center;
  animation:rise 2s cubic-bezier(.2,.7,.2,1) both;
}
@keyframes rise{
  from{ opacity:0; transform:translateY(16px); filter:blur(6px); }
  to{ opacity:1; transform:none; filter:blur(0); }
}

.intro h1{
  font-family:var(--kai);
  font-size:clamp(46px, 8.2vw, 104px);
  font-weight:400;
  letter-spacing:.22em;
  padding-left:.22em;
  color:#f0e3c8;
  text-shadow:0 2px 40px rgba(0,0,0,.8);
}

.intro-sub{
  margin-top:22px;
  font-family:var(--kai);
  font-size:clamp(11px, 1.35vw, 15px);
  letter-spacing:.42em; padding-left:.42em;
  color:rgba(233,220,192,.68);
  text-shadow:0 1px 12px rgba(0,0,0,.9);
}

.rule{
  width:min(420px, 58vw); height:1px;
  background:linear-gradient(90deg, transparent, rgba(201,169,124,.5), transparent);
  margin-bottom:46px;
}
.rule-short{ width:min(180px, 26vw); margin:34px 0 40px; opacity:.7; }

#enter{
  position:relative;
  margin-top:2px;
  padding:15px 46px 15px 50px;
  background:transparent;
  border:1px solid var(--gold-dim);
  color:rgba(240,227,200,.82);
  font-family:var(--kai);
  font-size:16px; letter-spacing:.4em;
  cursor:pointer;
  transition:border-color .5s ease, color .5s ease, background .5s ease, letter-spacing .5s ease;
  outline:none;
}
#enter span{ pointer-events:none; }
#enter:hover{
  border-color:rgba(201,169,124,.75);
  background:rgba(201,169,124,.07);
  color:#fbf2dc;
  letter-spacing:.46em;
}
#enter:focus-visible{ box-shadow:0 0 0 1px rgba(201,169,124,.4); }
#enter::after{
  content:""; position:absolute; inset:-1px;
  box-shadow:0 0 34px rgba(201,169,124,.16);
  opacity:0; transition:opacity .6s; pointer-events:none;
}
#enter:hover::after{ opacity:1; }

.intro-note{
  margin-top:28px;
  font-family:var(--kai);
  font-size:11px; letter-spacing:.34em; padding-left:.34em;
  color:rgba(233,220,192,.5);
  text-shadow:0 1px 10px rgba(0,0,0,.9);
}

.sr-only{
  position:absolute; width:1px; height:1px; padding:0; margin:-1px;
  overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; border:0;
}

.noscript{
  position:relative; z-index:20;
  max-width:640px; margin:16vh auto; padding:0 28px;
  font-family:var(--kai); line-height:2.1; color:#e9dcc0;
}
.noscript h2{ font-size:34px; letter-spacing:.2em; margin-bottom:28px; }
.noscript p{ margin-bottom:18px; font-size:15px; }
.noscript .sign{ margin-top:32px; opacity:.6; }

@media (max-width: 640px){
  .brand{ top:20px; left:20px; font-size:10px; letter-spacing:.2em; }
  .corner{ right:20px; bottom:20px; font-size:10px; letter-spacing:.3em; }
  .hint{ bottom:44px; font-size:12px; letter-spacing:.26em; }
  .bottom-hint{ bottom:24px; font-size:10px; letter-spacing:.14em; }
  .rule{ margin-bottom:34px; }
  .intro-sub{ margin-top:16px; }
}

@media (prefers-reduced-motion: reduce){
  .intro-inner{ animation:none; }
  .loader-line i{ animation-duration:.3s; }
}