/* Iris Lee — 光影之間 | 暖白高級展館 UI */
:root{
  --ink:#1e1b16; --muted:#6f6a61; --paper:#f7f3ec; --card:#fffdf8;
  --gold:#b9975b; --gold-dark:#8a6f3c; --line:#e6ddd0; --shadow:0 18px 50px rgba(30,25,15,.18);
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;overflow:hidden;background:#141210;
  font-family:"Noto Sans TC","PingFang TC","Microsoft JhengHei",system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink)}
#app,#app canvas{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none;user-select:none;-webkit-user-select:none}
button{font-family:inherit;cursor:pointer}
.hidden{display:none !important}

/* 載入畫面 */
#loading{position:fixed;inset:0;z-index:60;background:#1a1713;color:#f3ede1;display:flex;align-items:center;justify-content:center;text-align:center}
.load-eyebrow,.eyebrow{letter-spacing:.35em;font-size:11px;color:var(--gold);margin:0 0 14px}
#loading h1{font-family:Georgia,"Noto Serif TC",serif;font-weight:400;font-size:clamp(34px,6vw,58px);letter-spacing:.35em;margin:0 0 10px;text-indent:.35em}
.load-sub{color:#b8ad9c;font-size:14px;margin:6px 0 22px}
.load-bar{width:min(320px,70vw);height:2px;background:#3a332a;margin:0 auto;overflow:hidden}
.load-bar span{display:block;height:100%;width:0%;background:var(--gold);transition:width .25s}
.load-pct{color:#8f8471;font-size:12px;margin-top:12px;letter-spacing:.2em}

/* 頂部 HUD */
#hud{position:fixed;top:0;left:0;right:0;z-index:20;display:flex;justify-content:space-between;align-items:flex-start;
  padding:18px 22px 26px;pointer-events:none;
  background:linear-gradient(to bottom,rgba(20,17,12,.55),rgba(20,17,12,0))}
#hud h1{font-family:Georgia,"Noto Serif TC",serif;font-weight:400;color:#fdfaf3;font-size:clamp(20px,3vw,30px);margin:0;line-height:1.15;text-shadow:0 2px 14px rgba(0,0,0,.45)}
#hud h1 span{font-size:.55em;color:#e8ddc6;letter-spacing:.05em}
.hud-sub{color:#ddd3bf;font-size:12.5px;margin:7px 0 0;letter-spacing:.06em;text-shadow:0 1px 8px rgba(0,0,0,.5)}
.hud-right{pointer-events:auto;display:flex;gap:8px}
.hud-right button,.info-nav button,#enterBtn{
  border:1px solid rgba(255,255,255,.55);background:rgba(20,17,12,.55);color:#fdfaf3;
  padding:9px 15px;border-radius:999px;font-size:13px;letter-spacing:.08em;backdrop-filter:blur(6px)}
.hud-right button:hover{background:rgba(255,255,255,.92);color:#1e1b16}

/* 準星 */
#crosshair{position:fixed;left:50%;top:50%;transform:translate(-50%,-50%);z-index:10;color:rgba(255,255,255,.85);
  font-size:20px;font-weight:300;text-shadow:0 1px 6px rgba(0,0,0,.7);pointer-events:none;opacity:.7}

/* 側邊面板 — 像展館說明卡 */
.panel{position:fixed;top:96px;right:18px;z-index:30;width:min(360px,calc(100vw - 36px));max-height:calc(100vh - 170px);
  overflow:auto;-webkit-overflow-scrolling:touch;overscroll-behavior:contain;background:var(--card);border:1px solid var(--line);border-radius:4px;box-shadow:var(--shadow);padding:20px 20px 18px}
.panel-head{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:12px}
.panel h2{font-family:Georgia,"Noto Serif TC",serif;font-weight:400;font-size:22px;margin:0}
.panel h2 span{font-size:12px;color:var(--muted);letter-spacing:.2em;margin-left:6px}
.panel-head button,#closeInfo{border:0;background:none;font-size:15px;color:var(--muted);padding:6px}
.panel-head button:hover{color:var(--ink)}
.panel-note{font-size:12.5px;color:var(--muted);line-height:1.7;border-top:1px solid var(--line);padding-top:12px;margin:14px 0 0}
#artListItems{list-style:none;margin:0;padding:0}
#artListItems li{margin:0}
#artListItems button{display:flex;justify-content:space-between;gap:10px;width:100%;text-align:left;background:none;border:0;
  border-bottom:1px solid #f0e9db;padding:12px 2px;font-size:14.5px;color:var(--ink)}
#artListItems button:hover{color:var(--gold-dark)}
#artListItems button small{color:var(--muted);font-size:12px;white-space:nowrap}
#helpCard ul{margin:0;padding-left:18px;line-height:2;font-size:14px;color:#3d382f}
#helpCard b{color:var(--ink)}

/* 作品詳情 */
#infoPanel{padding:0;overflow:hidden}
#closeInfo{position:absolute;top:8px;right:8px;z-index:2;background:rgba(255,255,255,.92);border-radius:999px;padding:7px 12px;font-size:12.5px;box-shadow:0 4px 14px rgba(0,0,0,.18)}
#infoImg{width:100%;display:block;height:auto;max-height:44vh;object-fit:contain;background:#e9e2d4}
#infoPanel .info-no{color:var(--gold-dark);letter-spacing:.3em;font-size:11px;margin:16px 20px 6px}
#infoPanel h2{font-size:26px;margin:0 20px 6px}
.info-meta{margin:0 20px 12px;color:var(--muted);font-size:13px;letter-spacing:.04em}
.info-desc{margin:0 20px 16px;font-size:14.5px;line-height:1.9;color:#3d382f}
.info-nav{display:flex;gap:8px;padding:0 20px 20px}
.info-nav button{flex:1;border:1px solid #d8cdb8;background:#fff;color:var(--ink);border-radius:999px;padding:10px 0;font-size:13px}
.info-nav button:hover{border-color:var(--gold);color:var(--gold-dark)}

/* 開始畫面 */
#startOverlay{position:fixed;inset:0;z-index:50;display:flex;align-items:center;justify-content:center;text-align:center;
  background:radial-gradient(ellipse at center,rgba(26,22,17,.42),rgba(12,10,8,.78));color:#fdfaf3;padding:20px}
.start-inner{max-width:560px}
.start-inner h1{font-family:Georgia,"Noto Serif TC",serif;font-weight:400;font-size:clamp(42px,8vw,72px);letter-spacing:.28em;text-indent:.28em;margin:0 0 12px;text-shadow:0 4px 30px rgba(0,0,0,.5)}
.start-sub{letter-spacing:.18em;font-size:14px;color:#e8ddc6;margin:0 0 18px}
.start-desc{line-height:2;color:#ddd3bf;font-size:14.5px;margin:0 0 26px}
#enterBtn{font-size:15px;padding:13px 30px;border-color:var(--gold);background:rgba(185,151,91,.22)}
#enterBtn:hover{background:var(--gold);color:#1e1b16;border-color:var(--gold)}
.start-hint{margin-top:20px;font-size:12px;letter-spacing:.12em;color:#b8ad9c}

/* 底部操作列 */
#bottomBar{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:20;display:flex;gap:18px;flex-wrap:wrap;justify-content:center;pointer-events:none;
  background:rgba(20,17,12,.58);color:#efe8d8;border:1px solid rgba(255,255,255,.16);border-radius:999px;
  padding:9px 18px;font-size:12.5px;letter-spacing:.04em;backdrop-filter:blur(6px);max-width:calc(100vw - 24px)}
#bottomBar b{color:#fff}

/* 提示 */
#toast{position:fixed;left:50%;bottom:72px;transform:translateX(-50%);z-index:40;background:rgba(20,17,12,.85);color:#fdfaf3;
  padding:10px 18px;border-radius:999px;font-size:13px;box-shadow:var(--shadow)}
@media (max-width:640px){
  #infoPanel{left:0;right:0;top:auto;bottom:0;width:auto;max-height:84vh;border-radius:14px 14px 0 0}
  #infoImg{max-height:36vh}
  #hud{padding:14px 14px 22px}
  .hud-sub{display:none}
  .panel{top:78px}
  #bottomBar{gap:10px;font-size:11.5px;padding:8px 12px}
  #bottomBar span:nth-child(4){display:none}
}

/* 虛擬搖桿（電話專用：行走） */
#joystick{position:fixed;left:22px;bottom:76px;width:124px;height:124px;border-radius:50%;z-index:25;
  background:rgba(20,17,12,.35);border:1px solid rgba(255,255,255,.35);backdrop-filter:blur(4px);
  touch-action:none;display:none}
#joyKnob{position:absolute;left:50%;top:50%;width:54px;height:54px;border-radius:50%;
  background:rgba(253,250,243,.92);box-shadow:0 4px 16px rgba(0,0,0,.35);
  transform:translate(-50%,-50%)}
#joyLabel{position:absolute;left:0;right:0;bottom:-22px;text-align:center;font-size:11px;letter-spacing:.15em;color:#efe8d8;text-shadow:0 1px 6px rgba(0,0,0,.6)}
@media (pointer:coarse){ #joystick{display:block} }
@media (max-width:820px){ #joystick{display:block} }
body.touch #joystick{display:block}
@media (max-width:640px){
  #joystick{left:16px;bottom:64px;width:112px;height:112px}
  #joyKnob{width:50px;height:50px}
}