@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Fira+Code:wght@400;500&display=swap";body>footer{text-align:center;opacity:.75;border-top:1px solid color-mix(in srgb, currentColor 20%, transparent);padding:24px;font-size:.85rem}body>footer a{color:inherit}:root{--ad-slot-width:160px}@media (width<=1200px){aside.ad{display:none}}:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--bg-color:#f8fafc;--panel-bg:#fff;--display-bg:#fff;--text-color:#0f172a;--text-secondary:#475569;--border-color:#e2e8f0;--border-hover:#cbd5e1;--accent-color:#ea580c;--accent-hover:#c2410c;--accent-light:#f973161a;--key-bg:#fff;--key-hover:#f1f5f9;--key-fn-bg:#f1f5f9;--key-fn-hover:#e2e8f0;--btn-secondary-bg:#fff;--btn-secondary-text:#334155;--btn-secondary-border:#cbd5e1;--btn-secondary-hover:#f1f5f9;--error-color:#dc2626;--font-sans:"Inter", sans-serif;--font-mono:"Fira Code", monospace;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -1px #0000000f;--transition-speed:.15s}html.dark{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg-color:#0b0f19;--panel-bg:#111827;--display-bg:#0f172a;--text-color:#f3f4f6;--text-secondary:#9ca3af;--border-color:#1f2937;--border-hover:#374151;--accent-color:#f97316;--accent-hover:#fb923c;--accent-light:#f9731629;--key-bg:#1f2937;--key-hover:#2d3748;--key-fn-bg:#172033;--key-fn-hover:#1f2937;--btn-secondary-bg:#1f2937;--btn-secondary-text:#e5e7eb;--btn-secondary-border:#374151;--btn-secondary-hover:#2d3748;--error-color:#ef4444}*{box-sizing:border-box;font-family:var(--font-sans);margin:0;padding:0}body{background-color:var(--bg-color);color:var(--text-color);min-height:100vh;transition:background-color var(--transition-speed) ease, color var(--transition-speed) ease;flex-direction:column;display:flex}header{background-color:var(--panel-bg);border-bottom:1px solid var(--border-color);z-index:10;box-shadow:var(--shadow-sm);transition:background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;justify-content:space-between;align-items:center;padding:1rem 2.5rem;display:flex;position:sticky;top:0}.header-brand{align-items:center;gap:12px;display:flex}.header-logo{object-fit:contain;border-radius:6px;width:32px;height:32px}.header-title{letter-spacing:-.025em;color:var(--text-color);font-size:1.25rem;font-weight:600}.header-actions{align-items:center;gap:10px;display:flex}main{grid-template-columns:var(--ad-slot-width) minmax(0, 1400px) var(--ad-slot-width);flex:1;justify-content:center;gap:2.5rem;padding:2.5rem 2rem;display:grid}@media (width<=1200px){main{grid-template-columns:minmax(0,1400px)}}section{flex-direction:column;width:100%;display:flex}.panel{background-color:var(--panel-bg);border:1px solid var(--border-color);box-shadow:var(--shadow-md);transition:background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;border-radius:12px;flex-direction:column;display:flex;overflow:hidden}.panel-header{color:var(--text-secondary);border-bottom:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:8px;padding:.7rem 1.1rem;font-size:.85rem;font-weight:600;display:flex}.workspace{grid-template-columns:minmax(300px,360px) minmax(0,1fr);align-items:stretch;gap:1.25rem;width:100%;max-width:820px;margin:0 auto;display:grid}@media (width<=760px){.workspace{grid-template-columns:minmax(0,1fr)}}.display-area{background-color:var(--display-bg);border-bottom:1px solid var(--border-color);flex-direction:column;align-items:flex-end;gap:.35rem;padding:1.4rem 1.25rem 1.1rem;display:flex;overflow:hidden}.expression{font-family:var(--font-mono);color:var(--text-secondary);white-space:nowrap;min-height:1.2rem;font-size:.9rem}.display{font-family:var(--font-mono);color:var(--text-color);white-space:nowrap;font-size:2.4rem;font-weight:500;line-height:1.15}.display.compact{font-size:1.6rem}.display.error{color:var(--error-color);font-size:1.15rem}.keypad{grid-template-columns:repeat(4,1fr);gap:8px;padding:1rem;display:grid}.key{border:1px solid var(--border-color);background-color:var(--key-bg);min-height:60px;color:var(--text-color);cursor:pointer;transition:background-color var(--transition-speed) ease, border-color var(--transition-speed) ease, transform var(--transition-speed) ease;border-radius:10px;font-size:1.15rem;font-weight:500}.key:hover{background-color:var(--key-hover);border-color:var(--border-hover)}.key:focus-visible{outline:2px solid var(--accent-color);outline-offset:2px}.key:active,.key.pressed{background-color:var(--key-hover);transform:scale(.96)}.key-fn{background-color:var(--key-fn-bg);color:var(--text-secondary)}.key-fn:hover,.key-fn:active,.key-fn.pressed{background-color:var(--key-fn-hover)}.key-op{color:var(--accent-color);font-size:1.35rem;font-weight:600}.key-op:active,.key-op.pressed,.key-op:hover{background-color:var(--accent-light);border-color:var(--accent-color)}.key-equals{background-color:var(--accent-color);border-color:var(--accent-color);color:#fff;font-size:1.35rem;font-weight:600}.key-equals:hover,.key-equals:active,.key-equals.pressed{background-color:var(--accent-hover);border-color:var(--accent-hover)}.clear-btn{color:var(--text-secondary);cursor:pointer;transition:color var(--transition-speed) ease;background:0 0;border:none;padding:.2rem .3rem;font-size:.8rem;font-weight:500}.clear-btn:hover{color:var(--accent-color)}.history-panel{min-height:280px}.history-body{flex:1;position:relative}.history-list{flex-direction:column;gap:4px;padding:.6rem;display:flex;position:absolute;inset:0;overflow-y:auto}.history-empty{color:var(--text-secondary);padding:1rem .6rem;font-size:.85rem}.history-item{cursor:pointer;text-align:right;width:100%;transition:background-color var(--transition-speed) ease, border-color var(--transition-speed) ease;background:0 0;border:1px solid #0000;border-radius:8px;flex-direction:column;align-items:flex-end;gap:2px;padding:.55rem .7rem;display:flex}.history-item:hover{background-color:var(--key-fn-bg);border-color:var(--border-color)}.history-expression{font-family:var(--font-mono);color:var(--text-secondary);font-size:.8rem}.history-result{font-family:var(--font-mono);color:var(--text-color);font-size:1.05rem;font-weight:500}.page-content{max-width:760px;color:var(--text-secondary);flex-direction:column;gap:1.75rem;margin:0 auto;padding:1rem 1.5rem 4rem;font-size:.95rem;line-height:1.7;display:flex}.page-content h2{color:var(--text-color);border-bottom:1px solid var(--border-color);margin-bottom:.6rem;padding-bottom:.4rem;font-size:1.15rem}.page-content ul{padding-left:1.25rem}.page-content li{margin-bottom:.4rem}.page-content p{margin-bottom:.6rem}.page-content strong{color:var(--text-color)}.page-content code{background-color:var(--panel-bg);border:1px solid var(--border-color);font-size:.9em;font-family:var(--font-mono);border-radius:4px;padding:.1em .4em}.btn{cursor:pointer;transition:all var(--transition-speed) ease;border:1px solid #0000;border-radius:8px;outline:none;justify-content:center;align-items:center;gap:8px;padding:.6rem 1.2rem;font-size:.9rem;font-weight:500;display:inline-flex}.btn:active{transform:translateY(0)}.btn-secondary{background-color:var(--btn-secondary-bg);color:var(--btn-secondary-text);border-color:var(--btn-secondary-border)}.btn-secondary:hover{background-color:var(--btn-secondary-hover);border-color:var(--border-hover);transform:translateY(-1px)}#theme-toggle-btn{aspect-ratio:1;border-radius:8px;padding:.6rem}#theme-toggle-btn svg{display:block}html:not(.dark) #theme-toggle-btn .sun-icon,html.dark #theme-toggle-btn .moon-icon{display:none}