:root{
  --bg:#14161c; --bg2:#1c1f27; --line:#2c313c;
  --fg:#eef0f5; --dim:#9aa2b2; --accent:#ffe97a; --accent-d:#d9be3e;
  --pad-s: env(safe-area-inset-bottom, 0px);
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
  background:var(--bg); color:var(--fg);
  font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Noto Sans JP",sans-serif;
  overflow:hidden; overscroll-behavior:none; -webkit-text-size-adjust:100%;
}
button{font:inherit;color:inherit;cursor:pointer}

#app{height:100dvh;display:flex;flex-direction:column;padding-bottom:var(--pad-s)}

/* ---- ヘッダー ---- */
#header{
  flex:0 0 auto;display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:9px 12px;border-bottom:1px solid var(--line);background:var(--bg2);
}
#header h1{font-size:15px;margin:0;font-weight:700;letter-spacing:.02em}
.hgroup{display:flex;align-items:center;gap:8px}
.timer{font-variant-numeric:tabular-nums;font-size:16px;font-weight:700;color:var(--accent);min-width:52px;text-align:right}
.icon{
  background:transparent;border:1px solid var(--line);border-radius:8px;
  padding:5px 9px;font-size:12px;color:var(--dim);line-height:1;
}
.icon[aria-pressed="true"]{color:#14161c;background:var(--accent);border-color:var(--accent)}

/* ---- ステージ ---- */
#stage{flex:1 1 auto;min-height:0;display:flex;flex-direction:column}
#board-col{flex:0 0 auto;display:flex;flex-direction:column;align-items:center;padding:10px 10px 0}
#board-wrap{width:100%;display:flex;justify-content:center}

#board{
  position:relative;border-radius:6px;overflow:hidden;
  background:#0e1014;box-shadow:0 2px 18px rgba(0,0,0,.5);
  outline:1px solid var(--line);
}
#guide,#preview,#finish{
  position:absolute;inset:0;background-size:100% 100%;background-position:center;
  pointer-events:none;
}
#guide{opacity:.18}
#preview{opacity:1;transition:opacity .35s ease}
#finish{opacity:0;transition:opacity .6s ease;z-index:60}
#grid{position:absolute;inset:0;pointer-events:none;opacity:.5}
#confetti{position:absolute;inset:0;width:100%;height:100%;display:none;z-index:70;pointer-events:none}

#credit{
  margin:8px 0 0;font-size:12.5px;color:var(--dim);
  display:flex;gap:8px;align-items:baseline;min-height:18px;
}
#credit-title{color:var(--fg);font-weight:700}
#credit-title:not(:empty)::before{content:"「"}
#credit-title:not(:empty)::after{content:"」"}
.by{font-size:11.5px}

/* ---- 操作バー ---- */
#controls{display:flex;align-items:center;gap:8px;width:100%;max-width:640px;padding:10px 0}
.ctl{
  display:flex;flex-direction:column;align-items:flex-start;gap:1px;
  background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:6px 10px;min-width:0;
}
.ctl-label{font-size:9.5px;color:var(--dim);letter-spacing:.08em}
.ctl-value{font-size:13px;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:9em}
.seg{display:flex;background:var(--bg2);border:1px solid var(--line);border-radius:10px;overflow:hidden;flex:1 1 auto}
.seg button{
  flex:1;background:transparent;border:0;padding:6px 2px;font-size:11.5px;line-height:1.25;
  color:var(--dim);display:flex;flex-direction:column;align-items:center;
}
.seg button small{font-size:9.5px;opacity:.75}
.seg button.on{background:#2a2f3a;color:var(--fg);font-weight:700}
.primary{
  background:var(--accent);color:#14161c;border:0;border-radius:10px;
  padding:10px 16px;font-weight:800;font-size:14px;white-space:nowrap;
}
.primary:disabled{opacity:.4}
.ghost{background:transparent;border:1px solid var(--line);border-radius:10px;padding:10px 14px;font-size:13.5px;color:var(--fg)}

/* ---- トレイ ---- */
#tray-col{flex:1 1 auto;min-height:0;display:flex;flex-direction:column;border-top:1px solid var(--line);background:#111319}
#tray-head{
  flex:0 0 auto;display:flex;justify-content:space-between;
  padding:5px 12px;font-size:10.5px;color:var(--dim);letter-spacing:.06em;
}
#tray{
  flex:1 1 auto;min-height:0;overflow-y:auto;overscroll-behavior:contain;
  display:flex;flex-wrap:wrap;align-content:flex-start;justify-content:center;
  gap:4px;padding:2px 8px 10px;
}

/* ---- ピース ---- */
.piece{
  display:block;touch-action:none;user-select:none;-webkit-user-select:none;
  filter:drop-shadow(0 1px 2px rgba(0,0,0,.55));
}
.piece.in-tray{width:var(--cw);height:var(--ch);flex:0 0 auto}
.piece.on-board{position:absolute;left:0;top:0;will-change:transform}
.piece.locked{filter:none}
.piece.dragging{
  position:fixed;left:0;top:0;z-index:999;pointer-events:none;
  filter:drop-shadow(0 10px 16px rgba(0,0,0,.6));transform-origin:center;
}

/* ---- シート ---- */
[hidden]{display:none!important}
.sheet{position:fixed;inset:0;z-index:200;display:flex;align-items:flex-end;justify-content:center}
.sheet-bg{position:absolute;inset:0;background:rgba(0,0,0,.6)}
.sheet-body{
  position:relative;width:100%;max-width:520px;background:var(--bg2);
  border-radius:16px 16px 0 0;padding:16px 16px calc(16px + var(--pad-s));
  max-height:80dvh;overflow:auto;
}
.sheet-body h2{margin:0 0 12px;font-size:14px;color:var(--dim);font-weight:600}
#sheet-list{list-style:none;margin:0 0 12px;padding:0;display:flex;flex-direction:column;gap:8px}
#sheet-list button{
  width:100%;display:flex;align-items:center;gap:12px;background:#232833;
  border:1px solid var(--line);border-radius:12px;padding:8px;text-align:left;
}
#sheet-list button.on{border-color:var(--accent)}
#sheet-list img{width:88px;height:66px;object-fit:cover;border-radius:7px;flex:0 0 auto}
#sheet-list .nm{font-weight:700;font-size:14px}
#sheet-list .st{font-size:12px;color:var(--accent-d);letter-spacing:.14em}
.sheet-body .ghost{width:100%}

/* ---- 完成パネル ---- */
.panel{
  position:fixed;left:0;right:0;bottom:0;z-index:300;
  background:linear-gradient(to bottom,#1c1f27f2,#14161cfa);
  border-top:1px solid var(--line);border-radius:16px 16px 0 0;
  padding:18px 18px calc(18px + var(--pad-s));
  max-width:640px;margin:0 auto;
  transform:translateY(100%);transition:transform .45s cubic-bezier(.2,.8,.25,1);
  backdrop-filter:blur(6px);
}
.panel.show{transform:translateY(0)}
.panel p{margin:0 0 6px}
.done{font-size:19px;font-weight:800}
.done b{color:var(--accent);font-variant-numeric:tabular-nums;margin-left:6px}
.best{font-size:12.5px;color:var(--accent-d);min-height:16px}
.work{margin-top:12px!important;font-size:13.5px;display:flex;gap:8px;align-items:baseline}
.work span:first-child{font-weight:700}
.work span:first-child::before{content:"「"}
.work span:first-child::after{content:"」"}
.work .by{color:var(--dim)}
.promo{font-size:12.5px;color:var(--dim);line-height:1.6}
.promo-link{display:inline-block;margin:2px 0 14px;color:var(--accent);font-size:13.5px;font-weight:700;text-decoration:none}
.promo-link:hover{text-decoration:underline}
.panel-btns{display:flex;gap:8px}
.panel-btns button{flex:1}

#loading{
  position:fixed;inset:0;z-index:400;display:flex;align-items:center;justify-content:center;
  background:var(--bg);color:var(--dim);font-size:13px;
}
#loading.hide{display:none}

/* ---- 広い画面：盤とトレイを左右2カラム ---- */
@media (min-width:900px){
  #stage{flex-direction:row;gap:16px;padding:14px 16px}
  #board-col{flex:0 0 auto;padding:0}
  #tray-col{flex:1 1 auto;border-top:0;border-left:1px solid var(--line);border-radius:12px}
  #tray{padding:8px 12px 14px}
}

@media (prefers-reduced-motion:reduce){
  #preview,#finish,.panel{transition-duration:.01ms}
}