@import "https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=Space+Grotesk:wght@400;500;600&display=swap";
.calc-container{--calc-bg:#1a1d23;--calc-surface:#22262e;--calc-surface-raised:#2a2f38;--calc-border:#363b44;--calc-amber:#f5b942;--calc-amber-dim:#c99a35;--calc-amber-glow:#f5b94226;--calc-text:#e8e6e3;--calc-text-dim:#8b9098;--calc-green:#4ade80;--calc-red:#f87171;background:var(--calc-bg);box-shadow:0 25px 20px -12px #00000080,0 0 0 1px var(--calc-border),inset 0 1px 0 #ffffff0d;border-radius:16px;margin-bottom:30px;font-family:IBM Plex Mono,monospace;position:relative;overflow:hidden}.calc-container:before{content:"";opacity:.03;pointer-events:none;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");border-radius:16px;position:absolute;inset:0}.calc-header{background:linear-gradient(180deg,var(--calc-surface-raised)0%,var(--calc-surface)100%);border-bottom:1px solid var(--calc-border);justify-content:space-between;align-items:center;padding:10px 12px;display:flex}@media (min-width:640px){.calc-header{padding:12px 16px}}.calc-title{text-transform:uppercase;letter-spacing:.1em;color:var(--calc-amber);align-items:center;gap:8px;font-family:Space Grotesk,sans-serif;font-size:11px;font-weight:600;display:flex}.calc-indicator{background:var(--calc-amber);width:6px;height:6px;box-shadow:0 0 8px var(--calc-amber);border-radius:50%;animation:2s ease-in-out infinite calc-pulse}@keyframes calc-pulse{0%,to{opacity:1}50%{opacity:.5}}.calc-history-btn{color:var(--calc-text-dim);border:1px solid var(--calc-border);cursor:pointer;text-transform:uppercase;letter-spacing:.05em;background:0 0;border-radius:4px;padding:4px 10px;font-family:IBM Plex Mono,monospace;font-size:10px;font-weight:500;transition:all .2s}.calc-history-btn:hover{color:var(--calc-amber);border-color:var(--calc-amber-dim);background:var(--calc-amber-glow)}.calc-history-btn.active{color:var(--calc-amber);border-color:var(--calc-amber);background:var(--calc-amber-glow)}.calc-history-panel{background:var(--calc-surface);border-bottom:1px solid var(--calc-border);max-height:120px;overflow-y:auto}.calc-history-item{text-align:left;border:none;border-bottom:1px solid var(--calc-border);cursor:pointer;background:0 0;width:100%;padding:8px 16px;font-family:IBM Plex Mono,monospace;transition:background .15s;display:block}.calc-history-item:last-child{border-bottom:none}.calc-history-item:hover{background:var(--calc-amber-glow)}.calc-history-expr{color:var(--calc-text-dim);margin-bottom:2px;font-size:11px}.calc-history-result{color:var(--calc-amber);font-size:13px;font-weight:500}.calc-display-area{border:1px solid var(--calc-border);background:#0d0f12;border-radius:8px;margin:10px;padding:12px;box-shadow:inset 0 2px 8px #0000004d,inset 0 0 0 1px #ffffff05}@media (min-width:640px){.calc-display-area{margin:12px;padding:16px}}.calc-expression{color:var(--calc-text);word-break:break-all;min-height:22px;font-size:13px;line-height:1.4}@media (min-width:640px){.calc-expression{min-height:24px;font-size:14px}}.calc-placeholder{color:var(--calc-text-dim);opacity:.5}.calc-result{border-top:1px solid var(--calc-border);align-items:baseline;gap:8px;margin-top:12px;padding-top:12px;display:flex}.calc-result-equals{color:var(--calc-text-dim);font-size:14px}.calc-result-value{color:var(--calc-amber);text-shadow:0 0 20px var(--calc-amber-glow);letter-spacing:-.02em;font-size:20px;font-weight:600}@media (min-width:640px){.calc-result-value{font-size:24px}}.calc-result-value.evaluating{animation:.15s ease-in-out calc-flicker}.calc-result-value.error{color:var(--calc-red)}@keyframes calc-flicker{0%,to{opacity:1}50%{opacity:.3}}.calc-tabs{gap:4px;margin-bottom:8px;padding:0 12px;display:flex}.calc-tab{text-transform:uppercase;letter-spacing:.08em;background:var(--calc-surface);border:1px solid var(--calc-border);color:var(--calc-text-dim);cursor:pointer;border-radius:6px;flex:1;padding:8px 12px;font-family:Space Grotesk,sans-serif;font-size:10px;font-weight:500;transition:all .2s}.calc-tab:hover{background:var(--calc-surface-raised);color:var(--calc-text)}.calc-tab.active{background:var(--calc-amber-glow);border-color:var(--calc-amber-dim);color:var(--calc-amber)}.calc-formula-grid{grid-template-columns:repeat(2,1fr);gap:6px;margin-bottom:10px;padding:0 10px;display:grid}@media (min-width:640px){.calc-formula-grid{grid-template-columns:repeat(3,1fr);margin-bottom:12px;padding:0 12px}}.calc-formula-btn{background:linear-gradient(180deg,var(--calc-surface-raised)0%,var(--calc-surface)100%);border:1px solid var(--calc-border);cursor:pointer;border-radius:8px;flex-direction:column;align-items:center;gap:2px;min-height:52px;padding:12px 8px;font-family:IBM Plex Mono,monospace;transition:all .15s;display:flex}@media (min-width:640px){.calc-formula-btn{min-height:auto;padding:10px 8px}}.calc-formula-btn:hover{background:linear-gradient(180deg,#353a45 0%,var(--calc-surface-raised)100%);border-color:var(--calc-amber-dim);transform:translateY(-1px)}.calc-formula-btn:active{transform:translateY(1px);box-shadow:inset 0 2px 4px #0003}.calc-formula-label{color:var(--calc-amber);font-size:13px;font-weight:600}.calc-formula-desc{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.05em;font-size:9px}.calc-keypad{grid-template-columns:repeat(4,1fr);gap:6px;padding:0 10px 10px;display:grid}@media (min-width:640px){.calc-keypad{padding:0 12px 12px}}.calc-key{cursor:pointer;border:none;border-radius:8px;height:52px;font-family:IBM Plex Mono,monospace;font-size:16px;font-weight:500;transition:all .1s;position:relative;overflow:hidden}@media (min-width:640px){.calc-key{height:48px;font-size:18px}}.calc-key:after{content:"";pointer-events:none;background:linear-gradient(#ffffff1a 0%,#0000 50%);position:absolute;inset:0}.calc-key-num{color:var(--calc-text);background:linear-gradient(#3a3f4a 0%,#2d323b 100%);box-shadow:0 2px 4px #0003,inset 0 1px #ffffff1a}.calc-key-num:hover{background:linear-gradient(#454b57 0%,#383e48 100%)}.calc-key-num:active{transform:translateY(1px);box-shadow:0 1px 2px #0003,inset 0 1px #ffffff0d}.calc-key-op{color:var(--calc-amber);background:linear-gradient(#3d4455 0%,#2f3544 100%);box-shadow:0 2px 4px #0003,inset 0 1px #ffffff1a}.calc-key-op:hover{background:linear-gradient(#4a5166 0%,#3a4155 100%)}.calc-key-op:active{transform:translateY(1px)}.calc-key-action{color:var(--calc-text-dim);background:linear-gradient(#2a2f38 0%,#22262e 100%);box-shadow:0 2px 4px #0003,inset 0 1px #ffffff0d}.calc-key-action:hover{color:var(--calc-text);background:linear-gradient(#353a45 0%,#2a2f38 100%)}.calc-key-action:active{transform:translateY(1px)}.calc-key-danger:hover{color:var(--calc-red)}.calc-key-equals{background:linear-gradient(180deg,var(--calc-amber)0%,var(--calc-amber-dim)100%);color:var(--calc-bg);font-weight:600;box-shadow:0 2px 8px #f5b9424d,inset 0 1px #fff3}.calc-key-equals:hover{background:linear-gradient(180deg,#f7c65a 0%,var(--calc-amber)100%);box-shadow:0 4px 12px #f5b94266,inset 0 1px #fff3}.calc-key-equals:active{transform:translateY(1px);box-shadow:0 1px 4px #f5b9424d,inset 0 1px #ffffff1a}.calc-send-btn{text-transform:uppercase;letter-spacing:.08em;cursor:pointer;background:linear-gradient(180deg,var(--calc-green)0%,#22c55e 100%);color:#052e16;border:none;border-radius:8px;width:calc(100% - 20px);margin:0 10px 10px;padding:14px 12px;font-family:Space Grotesk,sans-serif;font-size:11px;font-weight:600;transition:all .2s;display:block;box-shadow:0 2px 8px #4ade804d,inset 0 1px #fff3}@media (min-width:640px){.calc-send-btn{width:calc(100% - 24px);margin:0 12px 12px;padding:12px;font-size:12px}}.calc-send-btn:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 4px 16px #4ade8066,inset 0 1px #fff3}.calc-send-btn:active:not(:disabled){transform:translateY(1px)}.calc-send-btn:disabled{background:var(--calc-surface);color:var(--calc-text-dim);box-shadow:none;cursor:not-allowed}.calc-reference{padding:0 10px 10px}@media (min-width:640px){.calc-reference{padding:0 12px 12px}}.calc-reference-toggle{color:var(--calc-text-dim);cursor:pointer;background:0 0;border:none;align-items:center;gap:6px;padding:4px 0;font-family:Space Grotesk,sans-serif;font-size:10px;transition:color .2s;display:flex}.calc-reference-toggle:hover{color:var(--calc-text)}.calc-reference-arrow{font-size:8px;transition:transform .2s;display:inline-block}.calc-reference-arrow.open{transform:rotate(90deg)}.calc-reference-content{background:var(--calc-surface);border:1px solid var(--calc-border);border-radius:8px;margin-top:8px;padding:12px}.calc-formula-list{flex-direction:column;gap:12px;display:flex}.calc-formula-ref-item{border-bottom:1px solid var(--calc-border);padding-bottom:12px}.calc-formula-ref-item:last-child{border-bottom:none;padding-bottom:0}.calc-formula-ref-header{align-items:center;gap:8px;margin-bottom:6px;display:flex}.calc-formula-ref-header code{color:var(--calc-amber);background:var(--calc-amber-glow);border-radius:4px;padding:3px 8px;font-family:IBM Plex Mono,monospace;font-size:14px;font-weight:500}.calc-formula-ref-name{color:var(--calc-text-dim);text-transform:uppercase;letter-spacing:.05em;font-family:Space Grotesk,sans-serif;font-size:13px}.calc-formula-ref-math{color:var(--calc-text);padding-left:4px;font-size:18px}.calc-formula-ref-math .katex{color:var(--calc-text)}.calc-formula-ref-math p{margin:0}