.basic-wrap{max-width:340px;margin:0 auto;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:#1a1a1a}
.basic-header{display:flex;align-items:center;gap:12px;margin-bottom:20px}
.basic-icon{font-size:34px;line-height:1}
.basic-title{font-size:22px!important;font-weight:600!important;margin:0 0 3px!important;padding:0!important;border:none!important;color:#1a1a1a!important}
.basic-sub{font-size:13px;color:#666;margin:0}
.basic-calc-body{background:#1a1a1a;border-radius:16px;padding:16px}
.basic-display{background:#0f0f0f;color:#fff;font-size:32px;font-weight:600;font-family:monospace;text-align:right;padding:18px 16px;border-radius:10px;margin-bottom:12px;min-height:30px;overflow-x:auto;white-space:nowrap}
.basic-keypad{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}
.basic-key{padding:16px;font-size:18px;font-weight:600;border:none;border-radius:10px;background:#3a3a3a;color:#fff;cursor:pointer;transition:background .1s}
.basic-key:hover{background:#4a4a4a}
.basic-key:active{transform:scale(0.96)}
.basic-key-op{background:#525252}
.basic-key-op:hover{background:#666}
.basic-key-fn{background:#737373;font-size:15px}
.basic-key-fn:hover{background:#858585}
.basic-key-eq{background:#D97706}
.basic-key-eq:hover{background:#ea850f}