:root{
  --bg1:#6d3cff;
  --bg2:#3b4dff;

  --panel:#ffffff1f;
  --panel2:#ffffff2b;
  --border:#ffffff38;

  --text:#ffffff;
  --muted:#e8e8ff;

  --blue1:#25d0ff;
  --blue2:#2b6bff;

  --pink1:#ff4bd8;
  --pink2:#7a2bff;

  --shadow: 0 26px 60px rgba(0,0,0,.22);
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 20% 0%, rgba(255,255,255,.20), transparent 55%),
              radial-gradient(900px 500px at 90% 60%, rgba(255,255,255,.14), transparent 60%),
              linear-gradient(135deg, var(--bg1), var(--bg2));
}

.stage{
  min-height:100%;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  padding: 28px 16px;
  position:relative;
  overflow:hidden;
}

.bg-orb{
  position:absolute;
  border-radius:999px;
  filter: blur(0px);
  opacity:.35;
  pointer-events:none;
}
.orb-1{
  width: 280px; height:280px;
  left:-90px; top: 70px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.35), rgba(255,255,255,0));
}
.orb-2{
  width: 220px; height:220px;
  right:-80px; top: 140px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.25), rgba(255,255,255,0));
}
.orb-3{
  width: 420px; height:420px;
  right:-160px; bottom:-180px;
  background: radial-gradient(circle at 30% 30%, rgba(255,255,255,.18), rgba(255,255,255,0));
}

.top{
  text-align:center;
  margin-bottom: 18px;
}
h1{
  margin:0;
  font-size: clamp(22px, 3vw, 34px);
  letter-spacing: .2px;
  text-shadow: 0 8px 24px rgba(0,0,0,.22);
}
.sub{
  margin: 8px 0 0;
  color: var(--muted);
  font-weight: 600;
}

.board{
  width: min(920px, 100%);
  background: linear-gradient(180deg, rgba(255,255,255,.18), rgba(255,255,255,.06));
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 22px 20px 18px;
  backdrop-filter: blur(10px);
}

.board__tabs{
  display:flex;
  justify-content:center;
  gap: 38px;
  margin-bottom: 18px;
}
.tab{
  width: 36px;
  height: 6px;
  border-radius: 999px;
  background: rgba(255,255,255,.28);
}
.tab.isOn{
  background: rgba(255,255,255,.85);
}

.board__lines{
  display:grid;
  gap: 14px;
  padding: 14px 0 18px;
}
.line{
  height: 10px;
  border-radius: 999px;
  background: rgba(255,255,255,.20);
}
.line-1{
  width: 62%;
  margin: 0 auto;
  background: rgba(255,255,255,.34);
}
.line-2{ width: 78%; margin: 0 auto; }
.line-3{ width: 72%; margin: 0 auto; opacity:.75; }

/* Dual button */
.dual{
  width: min(620px, 100%);
  margin: 18px auto 8px;
  position:relative;
  display:grid;
  grid-template-columns: 1fr 96px 1fr;
  align-items:center;
  border-radius: 999px;
  box-shadow: 0 18px 40px rgba(0,0,0,.28);
}

.dual__side{
  display:flex;
  align-items:center;
  justify-content:center;
  padding: 18px 16px;
  text-decoration:none;
  color: #fff;
  font-weight: 800;
  font-size: clamp(16px, 2vw, 22px);
  letter-spacing:.2px;
  transition: transform .12s ease, filter .12s ease;
  user-select:none;
}
.dual__side:focus-visible{
  outline: 3px solid rgba(255,255,255,.65);
  outline-offset: 4px;
}
.dual__side:hover{ filter: brightness(1.06); }
.dual__side:active{ transform: translateY(1px); }

.dual__side--left{
  border-top-left-radius: 999px;
  border-bottom-left-radius: 999px;
  background: linear-gradient(135deg, var(--blue1), var(--blue2));
}
.dual__side--right{
  border-top-right-radius: 999px;
  border-bottom-right-radius: 999px;
  background: linear-gradient(135deg, var(--pink1), var(--pink2));
}

.dual__or{
  width: 92px;
  height: 92px;
  display:grid;
  place-items:center;
  border-radius: 999px;
  background: #fff;
  color: #4b2dff;
  font-weight: 900;
  box-shadow: 0 18px 40px rgba(0,0,0,.22);
  z-index:2;
  margin: 0 auto;
  border: 6px solid rgba(255,255,255,.35);
}

.mini{
  margin-top: 16px;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.mini__card{
  background: rgba(255,255,255,.10);
  border: 1px solid rgba(255,255,255,.20);
  border-radius: 16px;
  padding: 12px 12px;
}
.mini__title{
  font-weight: 900;
  margin-bottom: 6px;
}
.mini__text{
  color: var(--muted);
  font-weight: 600;
  line-height: 1.35;
}
code{
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: .95em;
  background: rgba(0,0,0,.18);
  padding: 2px 6px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,.16);
}

.foot{
  margin-top: 12px;
  color: rgba(255,255,255,.85);
  font-weight: 600;
  font-size: 12px;
  text-align:center;
}

/* Mobile */
@media (max-width: 620px){
  .dual{
    grid-template-columns: 1fr;
    gap: 10px;
    box-shadow:none;
  }
  .dual__or{ display:none; }
  .dual__side--left,
  .dual__side--right{
    border-radius: 999px;
    box-shadow: 0 18px 40px rgba(0,0,0,.22);
  }
  .mini{ grid-template-columns: 1fr; }
}