:root{
  --bg:#000;
  --fg:#fff;
  --muted: #bdbdbd;
  --accent: #111;
  --radius: 14px;
  --btn-h: 56px;
  --gap: 12px;
  font-family: -apple-system, "SF Pro Text", "Roboto", "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  color-scheme: dark;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  background:var(--bg);
  color:var(--fg);
  display:flex;
  align-items:stretch;
  justify-content:center;
  padding:16px;
}

.app{
  width:100%;
  max-width:780px;
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height:calc(100vh - 32px);
}

/* Top bar */
.topbar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:8px;
}
.title{font-size:14px; color:var(--muted)}
.icon-btn, .action-btn{
  background:transparent;
  border:1px solid rgba(255,255,255,0.06);
  color:var(--fg);
  padding:8px 12px;
  border-radius:10px;
  min-width:44px;
  min-height:44px;
  font-size:18px;
}
.action-btn{padding:10px 14px}
.icon-btn[disabled], .action-btn[disabled]{opacity:0.35}

/* Dice list */
.dice-list{
  display:flex;
  flex-direction:column-reverse; /* new die added on top visually (append -> reversed) */
  gap:14px;
  align-items:center;
  justify-content:flex-start;
  flex:1;
  padding-top:10px;
}

/* die block */
.die {
  width:100%;
  max-width:720px;
  border-radius:16px;
  border:1px solid rgba(255,255,255,0.06);
  padding:16px;
  background:transparent;
  display:flex;
  flex-direction:column;
  gap:12px;
  transition: background 180ms ease, transform 120ms ease, color 180ms ease;
}

/* inverted (final) */
.die.inverted{
  background:var(--fg);
  color:var(--bg);
  border-color: rgba(0,0,0,0.12);
}

/* header row */
.die-head{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:8px;
}
.die-label{
  display:flex;
  gap:8px;
  align-items:center;
  font-size:13px;
  color:var(--muted);
}

.remove-btn{
  background:transparent;
  border:1px solid rgba(255,255,255,0.06);
  padding:6px 10px;
  border-radius:10px;
}

/* big roll button (or type selector area) */
.die-main{
  display:flex;
  justify-content:center;
  align-items:center;
}
.roll-btn{
  width:80%;
  height:var(--btn-h);
  border-radius:12px;
  display:flex;
  align-items:center;
  justify-content:center;
  font-size:30px;
  letter-spacing:1px;
  user-select:none;
  border:1px solid rgba(255,255,255,0.06);
  transition: transform 120ms cubic-bezier(.2,.9,.2,1), opacity 120ms;
  background:transparent;
  color:inherit;
}
.roll-btn:active{ transform: scale(.90) }
.roll-btn[aria-busy="true"]{ cursor:progress; opacity:0.95 }

/* die type chooser (hidden during rolling) */
.type-chooser{
  display:flex;
  justify-content:center;
  gap:8px;
  flex-wrap:wrap;
}
.type-btn{
  min-width:44px;
  height:44px;
  border-radius:10px;
  border:1px solid rgba(255,255,255,0.06);
  background:transparent;
  color:inherit;
  font-size:16px;
}
.type-btn.selected{
  background:var(--fg);
  color:var(--bg);
  border-color: rgba(255,255,255,0.08);
}

/* small hint */
.hint{
  font-size:12px;
  color:var(--muted);
  text-align:right;
}

/* footer */
.footer{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:8px;
  font-size:14px;
}
.sum{font-weight:600}

/* subtle press animation on roll */
.roll-press {
  animation: press .24s ease;
}
@keyframes press {
  0%{ transform: scale(1) }
  50%{ transform: scale(0.90) }
  100%{ transform: scale(1) }
}

/* responsive tweaks */
@media (max-width:480px){
  .roll-btn{ font-size:26px; height:60px }
  .type-btn{ min-width:40px; height:40px; font-size:15px }
}