:root{
  --bg:#0f1115;
  --panel:#151922;
  --panel-2:#10141b;
  --text:#e8eef8;
  --muted:#9aa4b2;
  --accent:#00ff99;
  --accent-2:#00aaff;
  --danger:#ff477e;
  --radius:16px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:ui-sans-serif,system-ui,"Segoe UI",Roboto,Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(1200px 800px at 20% -20%, #133, transparent),
    radial-gradient(1200px 800px at 120% 20%, #123, transparent),
    var(--bg);
}

/* header */
.app-header{
  padding:24px 18px 8px;
  display:grid;
  gap:8px;
  justify-items:center;
}
.brand{display:flex;align-items:center;gap:.7rem}
.logo{font-size:1.4rem; filter:drop-shadow(0 6px 12px rgba(0,0,0,.4))}
h1{margin:0;font-size:clamp(1.3rem,2.8vw,2.2rem);letter-spacing:.5px}
.status-box {
  color: var(--muted);
  font-weight: 600;
  min-height: 24px;
  text-align: center;
  letter-spacing: .2px;
}

/* layout */
.shell{max-width:880px;margin:12px auto;padding:0 16px;display:grid;gap:16px}
.panel{
  background:linear-gradient(180deg, rgba(255,255,255,.045), transparent);
  border:1px solid rgba(255,255,255,.06);
  border-radius:var(--radius);
  box-shadow:var(--shadow);
  padding:18px;
}

/* share card */
.share-card h2{margin:0 0 10px;font-size:1.05rem;color:var(--text);opacity:.9}
.room-link-box{display:flex;gap:10px;align-items:center;margin-top:12px;flex-wrap:wrap}
#room-link{
  flex:1 1 380px;
  padding:12px 12px;
  border-radius:12px;
  border:1px solid rgba(255,255,255,.08);
  background:linear-gradient(180deg, #1b2230, #12161e);
  color:#fff;
  font-family:ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}
.btn{
  border:0;
  border-radius:12px;
  padding:12px 14px;
  font-weight:700;
  cursor:pointer;
  transition:transform .12s ease, filter .2s ease, box-shadow .2s ease;
  background:var(--accent-2);
  color:#fff;
  box-shadow:0 6px 18px rgba(0,170,255,.25);
}
.btn:hover{filter:brightness(1.06)}
.btn:active{transform:translateY(1px)}
.btn.ghost{
  background:transparent;
  border:1px solid rgba(255,255,255,.12);
  color:var(--text);
  box-shadow:none;
}
.share-buttons{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}

/* game */
.game-area{
  display:grid;
  grid-template-columns: repeat(3, minmax(120px,1fr));
  gap:14px;
  justify-items:center;
}
.card-button{
  --glow: 0 0 0 rgba(0,0,0,0);
  width:100%;
  min-height:120px;
  background:linear-gradient(135deg,#1b2230,#12161e);
  border:1px solid rgba(255,255,255,.07);
  border-radius:18px;
  color:var(--accent);
  display:grid; place-items:center;
  gap:8px;
  font-size:1rem;
  box-shadow:var(--shadow);
  transition:transform .14s ease, box-shadow .2s ease, border-color .2s ease;
  position:relative;
  isolation:isolate;
}
.card-button i{font-size:1.8rem; filter:drop-shadow(0 8px 16px rgba(0,0,0,.4))}
.card-button:hover{transform:translateY(-2px); border-color: rgba(0,255,153,.4); box-shadow:0 12px 30px rgba(0,255,153,.12)}
.card-button:active{transform:translateY(0)}
.card-button[disabled]{opacity:.45; pointer-events:none}

.card-button.active{
  outline:2px solid var(--accent);
  box-shadow:0 0 0 6px rgba(0,255,153,.08), 0 12px 30px rgba(0,255,153,.18);
}

/* result */
.result-panel {
  display: grid;
  place-items: center;
}

.result-box {
  min-height: 48px;
  padding: 12px 18px;
  border-radius: 14px;
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 800;
  text-align: center;
  opacity: 0;
  transform: translateY(6px);

  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);

  transition: all .25s ease;
}

.result-box.win {
  color: var(--accent);
  border-color: rgba(0,255,153,.25);
  box-shadow: 0 8px 24px rgba(0,255,153,.12);
}

.result-box.lose {
  color: var(--danger);
  border-color: rgba(255,71,126,.25);
  box-shadow: 0 8px 24px rgba(255,71,126,.12);
}

.result-box.waiting {
  color: var(--muted);
}
/* overlays */
.overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 60;
  overflow: hidden;
}

.overlay::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(8, 12, 18, 0.42);
  backdrop-filter: blur(4px);
  opacity: 0;
  animation: overlayFade .9s ease forwards;
}

.overlay-card {
  position: relative;
  z-index: 2;
  min-width: min(92vw, 420px);
  padding: 28px 24px;
  border-radius: 22px;
  text-align: center;
  background: linear-gradient(180deg, rgba(24,29,40,.96), rgba(15,19,27,.96));
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: 0 20px 60px rgba(0,0,0,.42);
  transform: translateY(10px) scale(.96);
  opacity: 0;
  animation: cardIn .45s ease forwards;
}

.overlay-card h3 {
  margin: 0 0 8px;
  font-size: clamp(1.4rem, 3vw, 2rem);
  line-height: 1.1;
}

.overlay-card p {
  margin: 0;
  color: var(--muted);
  font-size: .98rem;
}

.overlay.win .overlay-card {
  border-color: rgba(0,255,153,.22);
  box-shadow:
    0 0 0 1px rgba(0,255,153,.06),
    0 20px 60px rgba(0,0,0,.42),
    0 0 40px rgba(0,255,153,.12);
}

.overlay.lose .overlay-card {
  border-color: rgba(255,71,126,.22);
  box-shadow:
    0 0 0 1px rgba(255,71,126,.06),
    0 20px 60px rgba(0,0,0,.42),
    0 0 40px rgba(255,71,126,.10);
}

.overlay.win h3 {
  color: var(--accent);
}

.overlay.lose h3 {
  color: var(--danger);
}

.burst {
  position: absolute;
  width: 14px;
  height: 14px;
  border-radius: 999px;
  opacity: .9;
  z-index: 1;
  animation: burstFly 900ms ease-out forwards;
}

.overlay.win .burst {
  background: radial-gradient(circle at 30% 30%, #b8ffd7, var(--accent));
  box-shadow: 0 0 18px rgba(0,255,153,.28);
}

.overlay.lose .burst {
  background: radial-gradient(circle at 30% 30%, #ffb3ca, var(--danger));
  box-shadow: 0 0 18px rgba(255,71,126,.22);
}

#copy-btn.flash {
  transform: translateY(-1px) scale(1.02);
  box-shadow: 0 8px 22px rgba(0,170,255,.28);
}

@keyframes overlayFade {
  to { opacity: 1; }
}

@keyframes cardIn {
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes burstFly {
  from {
    transform: translate(0,0) scale(.8);
    opacity: .95;
  }
  to {
    transform: translate(var(--tx), var(--ty)) scale(1.8);
    opacity: 0;
  }
}
.link-btn {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all .18s ease;
}

.link-btn:hover {
  color: var(--text);
  border-color: rgba(255,255,255,0.18);
  background: rgba(255,255,255,0.08);
}

.link-btn:active {
  transform: translateY(1px);
}
.status-box.win {
  color: var(--accent);
}

.status-box.lose {
  color: var(--danger);
}

.status-box.waiting {
  color: var(--muted);
}

.result-box.active {
  opacity: 1;
  transform: translateY(0);
}

.app-footer {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 0 20px;
}

.link-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: auto;
  max-width: fit-content;
  opacity: 0.9;
}

.link-btn:hover {
  opacity: 1;
}

@media (max-width:720px){
  .game-area {
    grid-template-columns: repeat(3, minmax(92px,1fr));
  }

  .card-button {
    min-height: 100px;
  }
}

@media (max-width:520px){
  .game-area {
    grid-template-columns: repeat(3, minmax(84px,1fr));
    gap: 10px;
  }

  .card-button {
    min-height: 92px;
  }

  .shell {
    padding: 0 12px;
  }

  .panel {
    padding: 14px;
  }

  #room-link {
    flex: 1 1 100%;
  }
}