.calc-shell {
    display: grid;
    gap: 14px;
    padding: 16px;
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(17,24,36,.98), rgba(10,15,25,.95));
    border: 1px solid rgba(255,255,255,.08);
    box-shadow: inset 0 1px 0 rgba(255,255,255,.06), 0 18px 34px rgba(0,0,0,.22);
}

.calc-meta { display:flex; justify-content:space-between; gap:10px; align-items:center; }
.calc-chip { padding:8px 12px; border-radius:999px; background:rgba(255,255,255,.05); color:var(--muted); font-size:.8rem; }
.calc-history { max-width:70%; overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }

#window-calc .calc-display {
    padding: 18px 16px;
    min-height: 74px;
    border-radius: 18px;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: .02em;
    text-align: right;
    background: linear-gradient(180deg, rgba(6,10,16,.98), rgba(15,22,33,.94));
    border: 1px solid rgba(98,212,255,.18);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.03);
}

#window-calc .calc-grid { grid-template-columns:repeat(4, minmax(0,1fr)); gap:10px; }
#window-calc .calc-grid button {
    min-height:60px;
    font-size:1.08rem;
    border-radius:18px;
    border:none;
    color:var(--text);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,.08);
    background: linear-gradient(180deg, rgba(255,255,255,.10), rgba(255,255,255,.035));
}
#window-calc .calc-grid button:hover { filter: brightness(1.06); }
#window-calc .calc-grid button.is-muted { background: linear-gradient(180deg, rgba(255,255,255,.07), rgba(255,255,255,.03)); }
#window-calc .calc-grid button.is-operator { background:linear-gradient(180deg, rgba(98,212,255,.28), rgba(98,212,255,.12)); }
#window-calc .calc-grid button.is-equals { background:linear-gradient(180deg, rgba(109,255,177,.28), rgba(109,255,177,.12)); }
#window-calc .calc-grid button.is-danger { background:linear-gradient(180deg, rgba(255,107,107,.28), rgba(255,107,107,.12)); }