body{background:#e0e0e0;margin:0;height:100vh;height:100dvh;overflow:hidden;font-family:sans-serif;touch-action:manipulation;-webkit-user-select:none;user-select:none}#calc{width:100vw;height:100vh;height:100dvh;background:#dcdcdc;padding:15px;box-sizing:border-box;display:flex;flex-direction:column;position:relative}#header-bar{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px;flex-shrink:0}#app-logo{height:32px;width:32px;margin-right:10px;vertical-align:middle}#app-title{color:#555;font-size:16px;font-weight:700;text-transform:uppercase;letter-spacing:1px;margin:0;flex-grow:1;text-align:center}#set-btn,#lang-btn{height:32px;width:45px;background:#444;color:#fff;border:none;border-radius:6px;font-size:14px;font-weight:700;padding:0;box-shadow:0 4px 0 rgba(0,0,0,0.4),inset 0 2px 0 rgba(255,255,255,0.2);transition:all 0.1s;margin-left:8px}#set-btn:active,#lang-btn:active{transform:translateY(2px);box-shadow:0 2px 0 rgba(0,0,0,0.4),inset 0 2px 0 rgba(255,255,255,0.2)}#display{background:#111;color:#0f0;text-align:right;padding:6px 12px;margin-bottom:12px;border-radius:8px;height:16vh;min-height:130px;display:flex;flex-direction:column;justify-content:flex-end;border:2px solid #aaa;position:relative;flex-shrink:0}#mem-ind{position:absolute;bottom:8px;left:12px;color:#f39c12;font-size:18px;font-weight:700}#display-top{display:flex;justify-content:space-between;flex:1;overflow:hidden;width:100%;margin-bottom:2px;gap:8px;margin-top:0}#fav-list{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:flex-start;overflow-y:auto;font-size:11px;gap:0;line-height:1.15;text-align:left;scrollbar-width:none}#fav-list::-webkit-scrollbar{display:none}#mini-hist{flex:1;display:flex;flex-direction:column;justify-content:flex-end;align-items:flex-end;color:#777;font-size:11px;gap:0;line-height:1.15;text-align:right}.mini-hist-line,.fav-line{white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.fav-note{color:#aaa;font-style:italic;margin-right:4px}.fav-res{color:#0f0}#main-val{font-size:34px;letter-spacing:1px;line-height:1;margin-top:2px;padding:0;position:relative;z-index:2}.grid{flex:1;display:grid;grid-template-columns:repeat(4,1fr);grid-auto-flow:row dense;gap:10px;padding-bottom:5px;overflow-y:auto;align-content:start}button{height:100%;min-height:45px;border:none;border-radius:8px;font-size:18px;font-weight:700;color:#fff;background:#555;box-shadow:0 6px 0 rgba(0,0,0,0.4),0 8px 6px rgba(0,0,0,0.3),inset 0 2px 0 rgba(255,255,255,0.2);transition:all 0.1s;position:relative}button:active{transform:translateY(4px);box-shadow:0 2px 0 rgba(0,0,0,0.4),0 3px 3px rgba(0,0,0,0.3),inset 0 2px 0 rgba(255,255,255,0.2)}.op-frac{background:#f39c12}.op-unit{background:#777}.const{background:#0056b3}.ctrl{background:#8b0000}.mem{background:#8e44ad}.eq{background:#2e7d32}.op-math{color:#f39c12;background:#333}.op-sci{background:#00838f}#hist-modal,#set-mod{display:none;position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.95);z-index:10;flex-direction:column;padding:15px;box-sizing:border-box;color:#fff}#hist-header,#set-head{display:flex;justify-content:space-between;margin-bottom:15px;flex-shrink:0}#hist-header button,#set-head button{height:50px;padding:0 20px;font-size:16px;background:#444;width:auto}#hist-list{flex:1;overflow-y:auto;font-size:18px}.hist-item{border-bottom:1px solid #333;padding:15px 10px;cursor:pointer;transition:background 0.1s;border-radius:4px;position:relative}.hist-item:active{background:#222}.hist-actions{position:absolute;right:10px;top:15px;display:flex;gap:6px}.hist-actions button{height:35px;width:40px;font-size:18px;padding:0;display:flex;align-items:center;justify-content:center;border-radius:6px;background:#444;box-shadow:0 4px 0 rgba(0,0,0,0.4),inset 0 1px 0 rgba(255,255,255,0.2)}.hist-actions button:active{transform:translateY(2px);box-shadow:0 2px 0 rgba(0,0,0,0.4),inset 0 1px 0 rgba(255,255,255,0.2)}.btn-fav.fav-active{color:#f1c40f}.btn-del{color:#e74c3c}.hist-eq{color:#aaa;font-size:15px;margin-bottom:4px;padding-right:90px}.hist-res{color:#0f0;font-weight:700}.hist-note-input{width:100%;background:0 0;border:none;border-bottom:1px solid #555;color:#f39c12;font-size:16px;font-style:italic;margin-top:8px;padding:6px 0;outline:0}.set-label{font-size:12px;color:#aaa;letter-spacing:1px;margin:5px 0;text-align:center;flex-shrink:0}#set-act,#set-pal{background:rgba(255,255,255,0.05);padding:10px;border-radius:8px;border:1px solid #333;gap:6px;overflow-y:auto;align-content:start}#set-act{margin-bottom:10px}#set-act::-webkit-scrollbar,#set-pal::-webkit-scrollbar{width:16px}#set-act::-webkit-scrollbar-track,#set-pal::-webkit-scrollbar-track{background:rgba(0,0,0,0.3);border-radius:8px}#set-act::-webkit-scrollbar-thumb,#set-pal::-webkit-scrollbar-thumb{background:#f39c12;border-radius:8px;border:3px solid #222}.slot{background:rgba(0,0,0,0.2);border:2px dashed #555;border-radius:8px;min-height:45px;display:flex;align-items:center;justify-content:center;width:100%;box-sizing:border-box}.slot button{width:100%;height:100%;margin:0;touch-action:none}.drag-ghost{position:fixed;pointer-events:none;z-index:9999;opacity:0.9;transform:scale(1.05);box-shadow:0 10px 20px rgba(0,0,0,0.5);margin:0}.span-2{grid-column:span 2}.slot.span-2{grid-column:span 2}