*{box-sizing:border-box;touch-action:manipulation;margin:0;padding:0;outline:none;-webkit-tap-highlight-color:transparent}html,body{width:100%;height:100%;position:fixed;overflow:hidden;background:#dcdcdc;font-family:sans-serif;-webkit-user-select:none;user-select:none}#calc{display:flex;flex-direction:column;width:100%;height:100%;overflow:hidden}#header-bar{display:flex;align-items:center;padding:1.5vmin;background:#e0e0e0;height:6vh;min-height:40px;flex-shrink:0}#app-logo{height:100%;max-height:30px;margin-right:2vw}#app-title{flex-grow:1;font-weight:bold;font-size:clamp(12px,3.5vmin,18px);color:#333;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}#set-btn,#lang-btn{background:#555;color:#fff;border:none;border-radius:1vmin;padding:1vmin 2vmin;margin-left:1vw;font-size:clamp(12px,3vmin,16px);font-weight:bold}#display{background:#111;color:#0f0;display:flex;flex-direction:column;padding:2vmin;flex-shrink:0;height:22vh;min-height:100px;border-radius:2vmin;margin:1vmin;justify-content:flex-end;position:relative}#display-top{display:flex;justify-content:space-between;font-size:clamp(10px,2.5vmin,14px);color:#aaa;flex-grow:1;overflow:hidden}#mini-hist{display:flex;flex-direction:column;justify-content:flex-end;text-align:right;flex-grow:1;line-height:1.2}#main-val{font-size:clamp(24px,8vmin,48px);text-align:right;word-break:break-all;margin-top:auto;line-height:1}#mem-ind{font-size:clamp(12px,3vmin,16px);position:absolute;bottom:2vmin;left:2vmin;color:#ff9800}#main-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(9,1fr);gap:1vmin;padding:1vmin;flex-grow:1;min-height:0;overflow:hidden;background:#dcdcdc}button{border:none;border-radius:1.5vmin;font-weight:bold;font-size:clamp(12px,4vmin,24px);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 3px 5px rgba(0,0,0,0.3);transition:transform 0.05s}.span-2{grid-column:span 2}button:active{transform:scale(0.95)}.op-sci{background:#00838f}.ctrl{background:#b71c1c}.const{background:#1565c0}.mem{background:#8e24aa}.op-unit{background:#757575}.num{background:#424242}.op-math{background:#212121;color:#ff9800}.op-frac{background:#ff9800;color:#fff}.eq{background:#2e7d32}#hist-modal,#set-mod{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.95);display:none;flex-direction:column;z-index:100;color:#fff;overflow:hidden}#hist-header,#set-head{display:flex;justify-content:space-between;padding:2vmin;background:#222}#hist-header button,#set-head button{background:#b71c1c;color:#fff;padding:2vmin;border-radius:1vmin;font-weight:bold;border:none}#hist-list{overflow-y:auto;flex-grow:1;padding:2vmin}.hist-item{border-bottom:1px solid #444;padding:2vmin 0;display:flex;flex-direction:column;gap:1vmin}.hist-actions{display:flex;justify-content:space-between}.btn-fav,.btn-del{background:none;border:none;font-size:clamp(18px,5vmin,28px);color:#888}.fav-active{color:#ffeb3b}.hist-eq{font-size:clamp(12px,3.5vmin,16px);color:#aaa}.hist-res{font-size:clamp(18px,5vmin,24px);font-weight:bold;color:#0f0}.hist-note-input{background:#333;color:#fff;border:1px solid #555;padding:1vmin;border-radius:1vmin;font-size:clamp(12px,3.5vmin,16px)}.set-label{padding:1vmin;text-align:center;font-size:clamp(10px,2.5vmin,14px);font-weight:bold;color:#aaa;background:#111}#set-act,#set-pal{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(50px,1fr);gap:1vmin;padding:1vmin;overflow-y:auto;background:#222;flex-grow:1;min-height:0}.slot{border:2px dashed #555;border-radius:1.5vmin;display:flex;align-items:center;justify-content:center;height:100%;touch-action:none}.slot button{width:100%;height:100%;touch-action:none}.drag-ghost{position:fixed;pointer-events:none;opacity:0.8;z-index:1000}#set-act::-webkit-scrollbar,#set-pal::-webkit-scrollbar{width:8vw;min-width:30px}#set-act::-webkit-scrollbar-track,#set-pal::-webkit-scrollbar-track{background:#111;border-left:1px solid #333}#set-act::-webkit-scrollbar-thumb,#set-pal::-webkit-scrollbar-thumb{background:#ffeb3b;border-radius:10px;border:3px solid #111}