:root{
  --bg1: #0f172a;
  --bg2: #1e293b;
  --card: rgba(255,255,255,0.08);
  --border: rgba(255,255,255,0.12);
  --text: #e5e7eb;
  --muted: #94a3b8;
  --accent: #22d3ee;
}

*{ box-sizing: border-box; }

html, body{
  height: 100%;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue",
               Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1000px 600px at 20% 10%, #0ea5e9, transparent 40%),
              radial-gradient(800px 500px at 90% 90%, #22d3ee, transparent 35%),
              linear-gradient(160deg, var(--bg1), var(--bg2));
}

.container{
  max-width: 980px;
  margin: 0 auto;
  padding: 32px 20px 40px;
}

.header{
  text-align: center;
  margin-bottom: 24px;
}
.header h1{
  margin: 0 0 6px;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  letter-spacing: 0.5px;
}
.sub{
  margin: 0;
  color: var(--muted);
}

.cards{
  display: grid;
  grid-template-columns: repeat(3, minmax(0,1fr));
  gap: 18px;
}
@media (max-width: 900px){
  .cards{ grid-template-columns: 1fr; }
}

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 22px;
  backdrop-filter: blur(8px);
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
  transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease;
}
.card:hover{
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0,0,0,0.35);
  border-color: rgba(255,255,255,0.18);
}
.card h2{
  margin: 0 0 8px;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: .3px;
}
.value{
  margin: 2px 0 8px;
  font-size: clamp(1.4rem, 4.5vw, 2.6rem);
  font-weight: 700;
}
.muted{
  color: var(--muted);
}

.actions{
  margin-top: 12px;
}
.btn{
  appearance: none;
  border: 1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.03));
  color: var(--text);
  padding: 10px 14px;
  border-radius: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, border-color .2s ease;
}
.btn:hover{
  transform: translateY(-1px);
  border-color: rgba(255,255,255,.28);
  box-shadow: 0 8px 20px rgba(34, 211, 238, .25);
}
.btn:active{
  transform: translateY(0);
}

.footer{
  margin-top: 28px;
  text-align: center;
  color: var(--muted);
  font-size: .95rem;
  opacity: .9;
}