:root{--bg-main: #0f172a;--bg-card: #1e293b;--bg-input: #090d16;--text-primary: #f8fafc;--text-muted: #94a3b8;--accent: #38bdf8;--accent-hover: #0284c7;--operator-bg: #334155;--operator-hover: #475569;--btn-bg: #1e293b;--btn-hover: #334155;--border: #334155;--danger: #ef4444;--success: #10b981;--radius: 12px;--glass-bg: rgba(30, 41, 59, .85);--glass-border: rgba(255, 255, 255, .1)}[data-theme=light]{--bg-main: #f8fafc;--bg-card: #ffffff;--bg-input: #f1f5f9;--text-primary: #0f172a;--text-muted: #64748b;--accent: #0284c7;--accent-hover: #0369a1;--operator-bg: #e2e8f0;--operator-hover: #cbd5e1;--btn-bg: #ffffff;--btn-hover: #f1f5f9;--border: #e2e8f0;--danger: #dc2626;--success: #16a34a;--glass-bg: rgba(255, 255, 255, .9);--glass-border: rgba(0, 0, 0, .08)}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}html,body{width:100%;height:100%;overflow-x:hidden}body{background-color:var(--bg-main);color:var(--text-primary);font-family:Inter,system-ui,-apple-system,sans-serif;min-height:100vh;min-height:100dvh;display:flex;justify-content:center;align-items:center;padding:16px;padding-top:max(16px,env(safe-area-inset-top));padding-bottom:max(16px,env(safe-area-inset-bottom));padding-left:max(16px,env(safe-area-inset-left));padding-right:max(16px,env(safe-area-inset-right));transition:background-color .25s ease,color .25s ease}#root{width:100%;max-width:1000px}.app-container{width:100%;display:grid;grid-template-columns:1fr 340px;gap:20px;background:var(--bg-card);border:1px solid var(--border);border-radius:16px;box-shadow:0 20px 25px -5px #00000026,0 8px 10px -6px #00000026;overflow:hidden;transition:background .2s ease,border-color .2s ease}.main-calc{width:100%;padding:24px;display:flex;flex-direction:column;gap:16px;min-width:0}.top-bar{width:100%;display:flex;flex-direction:column;gap:12px;border-bottom:1px solid var(--border);padding-bottom:12px;min-width:0;flex-shrink:0}.header-row{display:flex;justify-content:space-between;align-items:center;width:100%}.brand-badge{display:flex;align-items:center;gap:8px;min-width:0}.brand-title{font-size:1.25rem;font-weight:700;letter-spacing:-.5px;color:var(--accent);display:flex;align-items:center;gap:6px;white-space:nowrap}.ws-badge{font-size:.75rem;background:var(--operator-bg);color:var(--text-muted);padding:2px 8px;border-radius:12px;border:1px solid var(--border);font-weight:500;max-width:100px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.header-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.header-btn{display:inline-flex;align-items:center;gap:6px;background:var(--operator-bg);border:1px solid var(--border);color:var(--text-primary);border-radius:18px;padding:6px 12px;font-size:.82rem;font-weight:500;font-family:Inter,sans-serif;cursor:pointer;transition:all .2s ease;white-space:nowrap}.header-btn:hover{background:var(--btn-hover);border-color:var(--accent)}.header-btn svg{width:14px;height:14px;stroke-width:2;stroke:currentColor;fill:none}.header-btn .count-badge{background:var(--accent);color:#0f172a;font-size:.72rem;font-weight:700;border-radius:10px;padding:1px 6px;margin-left:2px}.mode-dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}.nav-tabs-wrapper{width:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch;touch-action:pan-x;scrollbar-width:none;padding-bottom:2px;display:block;flex-shrink:0}.nav-tabs-wrapper::-webkit-scrollbar{display:none}.nav-tabs{display:inline-flex;gap:6px;width:max-content;flex-wrap:nowrap}.nav-tab{background:none;border:none;color:var(--text-muted);font-weight:600;padding:8px 14px;border-radius:8px;cursor:pointer;font-size:.88rem;white-space:nowrap;flex-shrink:0;transition:background .15s ease,color .15s ease;-webkit-user-select:none;user-select:none;display:inline-flex;align-items:center;gap:6px}.nav-tab:hover{color:var(--text-primary)}.nav-tab.active{background:var(--operator-bg);color:var(--text-primary)}.display-panel{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;display:flex;flex-direction:column;align-items:flex-end;min-height:95px;justify-content:space-between;min-width:0;flex-shrink:0}.expression-input{width:100%;background:transparent;border:none;outline:none;box-shadow:none;color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:1.35rem;text-align:right;cursor:text;-webkit-user-select:text;user-select:text;min-width:0}.expression-input:focus,.expression-input:focus-visible{outline:none;border:none;box-shadow:none}.result-view{font-family:JetBrains Mono,monospace;font-size:1.85rem;font-weight:700;color:var(--accent);word-break:break-all;max-width:100%}.error-view{color:var(--danger);font-size:.85rem;font-family:JetBrains Mono,monospace}.keypad-grid{width:100%;display:grid;gap:8px;flex:1}.keypad-grid.basic{grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(5,1fr)}.keypad-grid.scientific{grid-template-columns:repeat(5,1fr);grid-template-rows:repeat(6,1fr)}button.key-btn{width:100%;height:100%;background:var(--btn-bg);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:1.15rem;font-weight:500;padding:10px 4px;min-height:48px;cursor:pointer;transition:background .15s ease,transform .05s ease;font-family:JetBrains Mono,monospace;display:flex;align-items:center;justify-content:center;touch-action:manipulation;-webkit-user-select:none;user-select:none}button.key-btn:hover{background:var(--btn-hover)}button.key-btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button.key-btn:active{transform:scale(.96)}button.key-btn.op{background:var(--operator-bg);color:var(--accent);font-weight:700}button.key-btn.eq{background:var(--accent);color:#0f172a;font-weight:700}[data-theme=light] button.key-btn.eq{color:#fff}button.key-btn.eq:hover{background:var(--accent-hover)}button.key-btn.fn{background:var(--btn-bg);color:#a5b4fc;font-size:.95rem}[data-theme=light] button.key-btn.fn{color:#4f46e5}.sidebar-panel{border-left:1px solid var(--border);background:var(--bg-card);padding:20px;display:flex;flex-direction:column;gap:14px;max-height:620px}.sidebar-header{display:flex;justify-content:space-between;align-items:center;font-size:.95rem;font-weight:600}.history-list{display:flex;flex-direction:column;gap:8px;overflow-y:auto;flex:1}.history-item{background:var(--bg-input);border:1px solid var(--border);border-radius:8px;padding:10px 12px;cursor:pointer;transition:border-color .15s ease}.history-item:hover,.history-item:focus-visible{border-color:var(--accent);outline:none}.history-exp{font-size:.82rem;color:var(--text-muted);font-family:JetBrains Mono,monospace}.history-res{font-size:1.05rem;font-weight:600;color:var(--text-primary);font-family:JetBrains Mono,monospace}.mobile-bottom-sheet-backdrop{display:none}@media (max-width: 768px){.sidebar-panel.desktop-only{display:none}.mobile-bottom-sheet-backdrop{display:flex;position:fixed;top:0;right:0;bottom:0;left:0;background:#000000a6;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);z-index:1000;align-items:flex-end;opacity:0;pointer-events:none;transition:opacity .25s ease}.mobile-bottom-sheet-backdrop.open{opacity:1;pointer-events:auto}.mobile-bottom-sheet{width:100%;max-height:85dvh;background:var(--bg-card);border-top:1px solid var(--border);border-radius:20px 20px 0 0;padding:16px;padding-bottom:max(20px,env(safe-area-inset-bottom));display:flex;flex-direction:column;gap:14px;transform:translateY(100%);transition:transform .3s cubic-bezier(.16,1,.3,1);box-shadow:0 -10px 25px #00000040}.mobile-bottom-sheet-backdrop.open .mobile-bottom-sheet{transform:translateY(0)}.sheet-handle-bar{width:40px;height:4px;background:var(--border);border-radius:4px;margin:0 auto;cursor:pointer}}.practical-form{width:100%;display:flex;flex-direction:column;gap:12px;min-width:0;flex:1;overflow-y:auto}.form-group{width:100%;display:flex;flex-direction:column;gap:4px}.form-group label{font-size:.85rem;color:var(--text-muted)}.form-group input,.form-group select{width:100%;background:var(--bg-input);border:1px solid var(--border);border-radius:6px;padding:10px 12px;color:var(--text-primary);font-family:JetBrains Mono,monospace;font-size:.95rem}.form-result-box{width:100%;background:var(--bg-input);border:1px solid var(--accent);border-radius:8px;padding:12px;margin-top:8px}@media (max-width: 768px){body{padding:0;margin:0;height:100vh;height:100dvh;align-items:stretch}#root{width:100%;height:100%;max-width:100%;display:flex;flex-direction:column}.app-container{width:100%;height:100%;max-width:100%;grid-template-columns:100%;border:none;border-radius:0;gap:0;display:flex;flex-direction:column;box-shadow:none}.main-calc{width:100%;height:100%;padding:12px;padding-top:max(10px,env(safe-area-inset-top));padding-bottom:max(12px,env(safe-area-inset-bottom));padding-left:max(10px,env(safe-area-inset-left));padding-right:max(10px,env(safe-area-inset-right));gap:10px;display:flex;flex-direction:column;justify-content:space-between}.top-bar{gap:8px;padding-bottom:8px}.brand-title{font-size:1.15rem}.header-btn{padding:4px 8px;font-size:.75rem;border-radius:14px;gap:4px}.header-btn svg{width:12px;height:12px}.nav-tab{padding:6px 12px;font-size:.82rem;gap:4px;border-radius:6px}.display-panel{padding:12px 14px;min-height:85px;border-radius:10px;flex-shrink:0}.expression-input{font-size:1.25rem}.result-view{font-size:1.65rem}.keypad-grid{gap:6px;flex:1}button.key-btn{padding:0;min-height:0;height:100%;font-size:1.15rem;border-radius:8px}.keypad-grid.scientific button.key-btn{font-size:.88rem}textarea{flex:1;min-height:140px;font-size:.85rem!important}}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border-width:0}