:root{--font-family: -apple-system, "Inter", "PingFang SC", system-ui, sans-serif}body{margin:0;font-family:var(--font-family);background-color:#080b11;color:#f3f4f6;display:flex;justify-content:center;align-items:center;min-height:100vh;overflow:hidden}.theme-dark{--bg-app: #0a0d16;--bg-display: rgba(13, 17, 28, .75);--border-color: rgba(255, 255, 255, .06);--text-main: #f3f4f6;--text-muted: #8e9bb0;--accent-glow: rgba(139, 92, 246, .4);--accent-color: #8b5cf6;--btn-num-bg: rgba(26, 32, 46, .45);--btn-num-hover: rgba(38, 47, 68, .7);--btn-fn-bg: rgba(38, 47, 68, .35);--btn-op-bg: rgba(139, 92, 246, .12);--btn-op-hover: rgba(139, 92, 246, .25);--btn-eq-bg: #8b5cf6;--btn-eq-hover: #a78bfa;--panel-bg: rgba(13, 17, 28, .96)}.theme-light{--bg-app: #fcfdfe;--bg-display: rgba(243, 244, 246, .85);--border-color: rgba(0, 0, 0, .05);--text-main: #1f2937;--text-muted: #6b7280;--accent-glow: rgba(99, 102, 241, .2);--accent-color: #6366f1;--btn-num-bg: rgba(243, 244, 246, .7);--btn-num-hover: rgba(229, 231, 235, .9);--btn-fn-bg: rgba(229, 231, 235, .5);--btn-op-bg: rgba(99, 102, 241, .08);--btn-op-hover: rgba(99, 102, 241, .18);--btn-eq-bg: #6366f1;--btn-eq-hover: #4f46e5;--panel-bg: rgba(255, 255, 255, .96)}.app-container{position:relative;width:370px;height:670px;background-color:var(--bg-app);border:1px solid var(--border-color);border-radius:24px;box-shadow:0 25px 60px #0006;overflow:hidden;display:flex;flex-direction:column;transition:background-color .3s ease,border-color .3s ease}#nebula-canvas{position:absolute;top:0;left:0;width:100%;height:100%;pointer-events:none;z-index:1}.app-header{position:relative;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:16px 20px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);border-bottom:1px solid var(--border-color)}.cloud-badge{display:flex;align-items:center;gap:6px;padding:4px 10px;border-radius:20px;font-size:11px;font-weight:500;letter-spacing:.3px;background:#ffffff08;border:1px solid var(--border-color)}.cloud-badge.synced{color:#10b981;background:#10b9810f}.cloud-badge.saving{color:#f59e0b;background:#f59e0b0f}.cloud-icon{width:11px;height:11px}.header-buttons{display:flex;gap:6px}.icon-button{background:none;border:none;color:var(--text-muted);cursor:pointer;padding:8px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .2s ease}.icon-button:hover,.icon-button.active{color:var(--text-main);background:#ffffff0f}.display-container{position:relative;z-index:10;margin:16px;padding:20px;background:var(--bg-display);border-radius:18px;border:1px solid var(--border-color);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);text-align:right;box-shadow:inset 0 2px 10px #00000008;overflow:hidden}.quantum-progress-bar{position:absolute;top:0;height:2px;background:linear-gradient(90deg,transparent,var(--accent-color),transparent);z-index:11}.expression-display{font-size:13px;color:var(--text-muted);min-height:18px;font-family:monospace;letter-spacing:.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.main-display{font-size:40px;font-weight:300;color:var(--text-main);margin-top:6px;font-family:monospace;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.calculator-body{position:relative;z-index:10;flex-grow:1;display:flex;flex-direction:column;justify-content:flex-end;padding:0 16px 20px}.buttons-container{display:flex;flex-direction:column;gap:10px}.memory-row{display:flex;justify-content:space-between;gap:6px;padding:0 4px}.mem-btn{background:none;border:none;color:var(--text-muted);font-size:11px;font-weight:600;cursor:pointer;padding:6px 8px;border-radius:8px;transition:all .2s}.mem-btn:hover{color:var(--text-main);background:#ffffff0a}.mode-indicator{color:var(--accent-color)}.grid-container{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.calc-button{position:relative;height:58px;border-radius:14px;border:1px solid var(--border-color);font-size:18px;font-weight:400;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;transition:background-color .15s ease,color .15s ease,box-shadow .15s ease}.key-legend{position:absolute;bottom:4px;right:6px;font-size:8px;color:var(--text-muted);opacity:.35;text-transform:uppercase;font-family:monospace}.calc-button.num-btn{background-color:var(--btn-num-bg);color:var(--text-main)}.calc-button.num-btn:hover{background-color:var(--btn-num-hover)}.calc-button.fn-btn{background-color:var(--btn-fn-bg);color:var(--text-muted)}.calc-button.op-btn{background-color:var(--btn-op-bg);color:var(--accent-color);font-weight:500}.calc-button.op-btn:hover{background-color:var(--btn-op-hover)}.calc-button.eq-btn{background-color:var(--btn-eq-bg);color:#fff;font-weight:500}.calc-button.eq-btn:hover{background-color:var(--btn-eq-hover);box-shadow:0 0 12px var(--accent-glow)}.span-two{grid-column:span 2}.keyboard-active{background-color:var(--accent-color)!important;color:#fff!important;box-shadow:0 0 15px var(--accent-glow)!important;transform:scale(.96)}.settings-panel{position:absolute;top:70px;left:16px;right:16px;background:var(--panel-bg);border:1px solid var(--border-color);border-radius:18px;padding:16px;z-index:50;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 10px 30px #0003}.panel-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.panel-header h3{margin:0;font-size:13px;color:var(--text-muted);letter-spacing:.5px}.close-panel{background:none;border:none;color:var(--text-muted);cursor:pointer;font-size:14px}.setting-item{display:flex;justify-content:space-between;align-items:center;padding:8px 0;font-size:12px;color:var(--text-main)}.toggle-button{background:#ffffff0a;border:1px solid var(--border-color);color:var(--text-main);padding:5px 10px;border-radius:8px;cursor:pointer;font-size:10px;display:flex;align-items:center}.history-panel{position:absolute;top:70px;bottom:20px;left:16px;right:16px;background:var(--panel-bg);border:1px solid var(--border-color);border-radius:18px;padding:16px;z-index:50;-webkit-backdrop-filter:blur(16px);backdrop-filter:blur(16px);box-shadow:0 10px 30px #0003;display:flex;flex-direction:column}.history-list{flex-grow:1;overflow-y:auto;display:flex;flex-direction:column;gap:10px;margin-top:10px}.history-item{padding:10px;border-radius:10px;background:#ffffff03;border:1px solid var(--border-color);cursor:pointer;transition:all .2s}.history-item:hover{background:#ffffff08}.hist-expr{font-size:11px;color:var(--text-muted);font-family:monospace}.hist-res{font-size:15px;color:var(--accent-color);font-weight:500;margin-top:2px;font-family:monospace}.clear-history-btn{margin-top:auto;background:#ef444414;border:1px solid rgba(239,68,68,.15);color:#ef4444;padding:8px;border-radius:10px;cursor:pointer;font-size:11px;display:flex;align-items:center;justify-content:center;gap:6px}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;flex-grow:1;color:var(--text-muted);text-align:center;padding:20px}.empty-icon{color:var(--accent-color);margin-bottom:14px;opacity:.5}.empty-title{font-size:13px;font-weight:600;color:var(--text-main);margin:0 0 4px}.empty-desc{font-size:11px;color:var(--text-muted);margin:0;line-height:1.4}.loading-overlay{position:absolute;top:0;left:0;width:100%;height:100%;background:#0a0d16e6;z-index:100;display:flex;justify-content:center;align-items:center;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.quantum-loader{display:flex;flex-direction:column;align-items:center;gap:14px;color:var(--text-main);text-align:center;padding:24px}.loader-icon{width:28px;height:28px;color:var(--accent-color);animation:rotate 1.8s linear infinite}.loader-text{font-size:12px;color:var(--text-muted);letter-spacing:.3px}.error-toast{position:absolute;top:75px;left:16px;right:16px;background:#ef4444f2;color:#fff;padding:8px 12px;border-radius:10px;font-size:11px;z-index:60;display:flex;align-items:center;gap:6px;box-shadow:0 4px 12px #ef444440}@keyframes rotate{0%{transform:rotate(0)}to{transform:rotate(360deg)}}