/* آلة اليسر العلمية — scientific calculator; scoped styles */
.v21-sci{box-sizing:border-box;max-width:980px;margin:0 auto;padding:18px 20px 24px;background:linear-gradient(150deg,#e5edf0,#f9fbfd);color:#153745;font-family:system-ui,-apple-system,'Segoe UI',sans-serif;min-height:100%}
.v21-sci *{box-sizing:border-box}
.v21-sci-title{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:8px 12px 16px;color:#244b60;font-size:1.18rem}
.v21-sci-title b small{display:inline-block;font-size:.62rem;color:#69909e;margin-inline-start:7px;letter-spacing:.08em}
.v21-sci-title>span{font:bold 1rem ui-monospace,monospace;color:#138c82}
.v21-sci-modes,.v21-sci-submode{display:flex;gap:7px;flex-wrap:wrap;margin:0 0 14px}
.v21-sci-modes button,.v21-sci-submode button{background:#fff;border:1px solid #c7d7df;color:#24536a;border-radius:8px;padding:10px 16px;cursor:pointer;font-weight:700}
.v21-sci-modes button.active,.v21-sci-submode button.active{background:#076d68;color:white;border-color:#076d68}
.v21-sci-screen{border:3px solid #839c9d;background:linear-gradient(180deg,#d9ecdb,#edf5e7);border-radius:14px 14px 6px 6px;box-shadow:inset 0 4px 13px #51725a25,0 4px 0 #abbec3;padding:12px;min-height:152px;display:flex;flex-direction:column;gap:8px;color:#122f32}
.v21-sci-screen[hidden]{display:none!important}
.v21-sci-indicators{display:flex;justify-content:space-between;gap:7px;color:#427464;font:700 .72rem ui-monospace,monospace;direction:ltr}
#v21-sci-input{font-size:25px;font-family:ui-monospace,'SFMono-Regular',monospace;width:100%;min-height:36px;box-shadow:none;border:none;outline:none;background:transparent;direction:ltr;text-align:left;color:#102d25}
#v21-sci-answer{font:700 29px ui-monospace,'SFMono-Regular',monospace;display:block;direction:ltr;text-align:right;color:#0f3442;word-break:break-all;min-height:36px}
#v21-sci-secondary{font-size:.82rem;color:#34625c;min-height:17px}
#v21-sci-answer.error,.v21-sci-output.error{color:#b32424}
.v21-sci-keyboard{direction:ltr;display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:8px;margin-top:16px}
.v21-sci-keyboard[hidden]{display:none!important}
.v21-sci-keyboard button{cursor:pointer;border-radius:11px;border:1px solid #bccbd3;min-height:46px;box-shadow:0 3px 0 #a8b6bf;background:linear-gradient(#fff,#e9eef5);color:#1c4051;font-size:1rem;font-weight:700;white-space:nowrap;touch-action:manipulation}
.v21-sci-keyboard button:hover{background:#d6eeeb}
.v21-sci-keyboard button:active{transform:translateY(2px);box-shadow:0 1px 0 #a8b6bf}
.v21-sci-keyboard button.equals{background:#0e8a81;color:#fff;border-color:#0a726d;box-shadow:0 3px 0 #075f59}
.v21-sci-keyboard button.danger{background:#cf4d51;color:#fff;border-color:#b8484e}
.v21-sci-keyboard button.active{outline:3px solid #52c49f;outline-offset:-3px}
.v21-sci-mode-panel[hidden]{display:none!important}
.v21-sci-mode-panel{background:#fff;border:1px solid #d4e2e5;border-radius:12px;padding:16px;margin-top:12px;min-height:225px}
.v21-sci-mode-panel p{font-size:.89rem;color:#466b71;margin:5px 0 12px}
.v21-sci-fields{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:10px;margin:12px 0}
.v21-sci-fields label{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:.88rem}
.v21-sci-fields input,.v21-sci-mode-panel textarea{font:1rem ui-monospace,monospace;padding:11px;border:1px solid #b8d1d2;border-radius:9px;background:#fff;color:#173942;width:100%}
.v21-sci-primary{display:block;cursor:pointer;border:0;border-radius:10px;background:#087f74;color:white;font-weight:750;padding:12px 19px;margin:12px 0}
.v21-sci-output{padding:12px;border-radius:9px;background:#f0f7f5;border:1px solid #dbe9e6;min-height:54px;overflow:auto;line-height:1.8;font-size:1rem;white-space:pre-wrap}
.v21-sci-output table{width:100%;border-collapse:collapse;direction:ltr;text-align:left}
.v21-sci-output td,.v21-sci-output th{padding:8px;border-bottom:1px solid #d7e5e2}
.v21-sci-history{background:#fff;border:1px solid #d2e0e2;border-radius:12px;padding:12px;margin-top:15px}
.v21-sci-history>div{display:flex;align-items:center;justify-content:space-between;gap:9px}
.v21-sci-history button{cursor:pointer;border:0;background:none;color:#087970}
#v21-sci-history-list{list-style:decimal;padding:3px 20px;margin:6px 0 0;max-height:100px;overflow:auto}
#v21-sci-history-list li{font-family:ui-monospace,monospace;direction:ltr;text-align:left;margin:5px 0}
#v21-sci-history-list li button{font-family:inherit;text-align:left;color:#173d54}
.v21-sci-disclaimer{font-size:.75rem;line-height:1.6;color:#547178;margin:12px 2px}
@media(max-width:720px){.v21-sci{padding:9px}.v21-sci-title{font-size:.95rem;padding:6px}.v21-sci-modes{gap:4px}.v21-sci-modes button{padding:7px;font-size:.8rem}.v21-sci-keyboard{gap:3px}.v21-sci-keyboard button{min-height:39px;font-size:.72rem;padding:3px}.v21-sci-screen{min-height:130px}#v21-sci-input{font-size:18px}#v21-sci-answer{font-size:22px}}