main{flex:1;display:flex;flex-direction:column;align-items:center;padding:32px 24px}.container-wide{width:100%;max-width:1280px;display:flex;flex-direction:column;gap:24px}.title-section{text-align:center}.title{color:#fff;font-size:28px;font-weight:700;background:linear-gradient(135deg,#fff 0%,var(--text) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.split-panels{display:grid;grid-template-columns:1fr 1fr;gap:20px}.panel-left,.panel-right{display:flex;flex-direction:column;gap:16px}.input-card,.presets-card,.result-card,.history-card{background:var(--bg2);border:1px solid var(--border);border-radius:12px;padding:20px;display:flex;flex-direction:column;gap:12px}.card-label{font-size:13px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}.input-row{display:flex;gap:8px}.input-row input{flex:1;background:var(--bg3);border:1px solid var(--border);color:#fff;padding:10px 12px;border-radius:var(--r);outline:none;font-size:15px;font-family:JetBrains Mono,monospace;transition:border-color .2s}.input-row input:focus{border-color:var(--accent)}.preset-btns{display:flex;flex-wrap:wrap;gap:6px}.preset-btns .btn{font-family:JetBrains Mono,monospace;font-size:12px;padding:4px 10px}.result-display{background:var(--bg3);border:1px solid var(--border);border-radius:var(--r);padding:16px;min-height:80px}.result-numeric{font-size:32px;font-weight:700;color:var(--accent);font-family:JetBrains Mono,monospace;word-break:break-all}.result-formatted{font-size:14px;color:var(--muted);margin-top:4px;font-family:JetBrains Mono,monospace}.result-steps{margin-top:8px;padding-top:8px;border-top:1px solid var(--border);font-size:12px;color:var(--muted);font-family:JetBrains Mono,monospace;white-space:pre-wrap;line-height:1.6}.result-error{color:var(--error);font-size:14px;font-family:JetBrains Mono,monospace}.history-list{max-height:200px;overflow-y:auto;display:flex;flex-direction:column;gap:4px}.history-item{padding:6px 8px;background:var(--bg3);border:1px solid var(--border);border-radius:6px;display:flex;justify-content:space-between;align-items:center;cursor:pointer;transition:border-color .2s;font-family:JetBrains Mono,monospace;font-size:12px}.history-item:hover{border-color:var(--accent)}.history-item .expr{color:var(--text)}.history-item .res{color:var(--accent);font-weight:600}.history-empty{color:var(--muted);font-style:italic;font-size:13px;padding:8px 0}@media(max-width:768px){main{padding:20px 12px}.split-panels{grid-template-columns:1fr}}