:root,[data-theme=light]{--bg-primary:#f0f2f5;--bg-secondary:#fff;--bg-sidebar:#fff;--bg-card:#fff;--bg-input:#f5f7fa;--bg-hover:#e8ecf0;--bg-active:#4361ee10;--text-primary:#1a1a2e;--text-secondary:#555770;--text-muted:#8b8da0;--text-on-accent:#fff;--accent:#4361ee;--accent-hover:#3651d4;--accent-light:#4361ee15;--accent-glow:#4361ee30;--border:#e2e4e9;--border-light:#ecedf0;--shadow-sm:0 1px 3px #0000000f, 0 1px 2px #0000000a;--shadow-md:0 4px 12px #00000014, 0 2px 4px #0000000a;--shadow-lg:0 10px 30px #0000001a, 0 4px 8px #0000000d;--radius-sm:5px;--radius-md:8px;--radius-lg:10px;--transition:.2s ease;--sidebar-width:200px;--font:system-ui, -apple-system, "Segoe UI", Roboto, sans-serif}[data-theme=dark]{--bg-primary:#0f1019;--bg-secondary:#1a1b27;--bg-sidebar:#141520;--bg-card:#1e1f2e;--bg-input:#252638;--bg-hover:#2a2b3d;--bg-active:#4361ee20;--text-primary:#e8e9f0;--text-secondary:#a0a3b8;--text-muted:#6b6e85;--text-on-accent:#fff;--accent:#4361ee;--accent-hover:#5a75ff;--accent-light:#4361ee20;--accent-glow:#4361ee35;--border:#2a2b3d;--border-light:#222336;--shadow-sm:0 1px 3px #0003, 0 1px 2px #00000026;--shadow-md:0 4px 12px #0000004d, 0 2px 4px #0003;--shadow-lg:0 10px 30px #0006, 0 4px 8px #00000040}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-size:13px}body{font-family:var(--font);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;transition:background var(--transition), color var(--transition);line-height:1.3}#root{min-height:100vh}button{cursor:pointer;color:inherit;background:0 0;border:none;font-family:inherit}select,input{color:inherit;font-family:inherit}.app{min-height:100vh;display:flex}.mobile-header{z-index:100;background:var(--bg-sidebar);border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);justify-content:space-between;align-items:center;height:56px;padding:0 16px;display:none;position:fixed;top:0;left:0;right:0}.hamburger-btn{border-radius:var(--radius-sm);width:40px;height:40px;transition:background var(--transition);justify-content:center;align-items:center;font-size:20px;display:flex}.hamburger-btn:hover{background:var(--bg-hover)}.mobile-title{font-size:16px;font-weight:600}.theme-toggle-mobile{border-radius:var(--radius-sm);width:40px;height:40px;transition:background var(--transition);justify-content:center;align-items:center;font-size:18px;display:flex}.theme-toggle-mobile:hover{background:var(--bg-hover)}.sidebar{width:var(--sidebar-width);z-index:50;background:var(--bg-sidebar);border-right:1px solid var(--border);height:100vh;transition:transform .3s ease, background var(--transition);flex-direction:column;display:flex;position:fixed;top:0;left:0;overflow:hidden}.sidebar-header{border-bottom:1px solid var(--border);flex-shrink:0;justify-content:space-between;align-items:center;padding:10px 10px 8px;display:flex}.logo{color:var(--accent);letter-spacing:-.3px;font-size:14px;font-weight:700}.logo-subtitle{color:var(--text-muted);margin:2px 0 0;font-size:10px;font-weight:400;line-height:1.3}.theme-toggle{border-radius:var(--radius-sm);width:36px;height:36px;transition:background var(--transition), transform .3s ease;justify-content:center;align-items:center;font-size:18px;display:flex}.theme-toggle:hover{background:var(--bg-hover);transform:rotate(20deg)}.category-nav{scrollbar-width:thin;scrollbar-color:var(--border) transparent;flex:1;padding:4px;overflow-y:auto}.category-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);transition:all var(--transition);text-align:left;align-items:center;gap:8px;padding:5px 8px;font-size:12px;font-weight:500;display:flex}.category-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.category-btn.active{background:var(--accent-light);color:var(--accent);font-weight:600}.category-icon{text-align:center;flex-shrink:0;width:18px;font-size:14px}.category-name{white-space:nowrap;text-overflow:ellipsis;overflow:hidden}.sidebar-footer{border-top:1px solid var(--border);flex-shrink:0;padding:4px}.history-btn{border-radius:var(--radius-sm);width:100%;color:var(--text-secondary);transition:all var(--transition);align-items:center;gap:8px;padding:5px 8px;font-size:12px;font-weight:500;display:flex}.history-btn:hover{background:var(--bg-hover);color:var(--text-primary)}.history-btn.active{background:var(--accent-light);color:var(--accent)}.sidebar-overlay{z-index:40;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#00000080;display:none;position:fixed;inset:0}.main-content{margin-left:var(--sidebar-width);max-width:700px;transition:margin var(--transition);flex:1;padding:16px 20px}.converter-header{margin-bottom:12px}.converter-title{color:var(--text-primary);letter-spacing:-.5px;font-size:18px;font-weight:700}.converter-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);transition:background var(--transition), border var(--transition), box-shadow var(--transition);padding:16px}.converter-row{align-items:flex-start;gap:10px;display:flex}.converter-field{flex-direction:column;flex:1;gap:4px;display:flex}.field-label{text-transform:uppercase;letter-spacing:.8px;color:var(--text-muted);font-size:10px;font-weight:600}.unit-select{border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-input);width:100%;color:var(--text-primary);appearance:none;cursor:pointer;transition:border-color var(--transition), box-shadow var(--transition);background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b6e85' d='M2 4l4 4 4-4'/%3E%3C/svg%3E");background-position:right 12px center;background-repeat:no-repeat;padding:7px 10px;font-size:14px;font-weight:500}.unit-select:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow);outline:none}.value-input{border:2px solid var(--border);border-radius:var(--radius-md);background:var(--bg-input);width:100%;color:var(--text-primary);transition:border-color var(--transition), box-shadow var(--transition);padding:10px;font-size:18px;font-weight:600}.value-input:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-glow);outline:none}.value-input::placeholder{color:var(--text-muted);font-weight:400}.value-input::-webkit-outer-spin-button{-webkit-appearance:none;margin:0}.value-input::-webkit-inner-spin-button{-webkit-appearance:none;margin:0}.value-input[type=number]{-moz-appearance:textfield}.result-display{border:2px solid var(--accent);border-radius:var(--radius-md);background:var(--accent-light);align-items:center;width:100%;min-height:42px;padding:10px;display:flex}.result-value{color:var(--accent);word-break:break-all;font-size:18px;font-weight:700}.swap-btn{background:var(--accent);width:36px;height:36px;color:var(--text-on-accent);box-shadow:var(--shadow-sm);transition:all var(--transition);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;margin-top:22px;display:flex}.swap-btn:hover{background:var(--accent-hover);box-shadow:var(--shadow-md);transform:scale(1.08)}.swap-btn:active{transform:scale(.95)}.swap-btn.swap-anim{animation:.3s swapRotate}@keyframes swapRotate{0%{transform:rotate(0)}to{transform:rotate(180deg)}}.action-row{gap:6px;margin-top:10px;display:flex}.action-btn{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-input);color:var(--text-secondary);transition:all var(--transition);padding:5px 10px;font-size:11px;font-weight:600}.action-btn:hover:not(:disabled){background:var(--bg-hover);color:var(--text-primary);border-color:var(--text-muted)}.action-btn:disabled{opacity:.4;cursor:not-allowed}.copy-btn.copied{color:#fff;background:#10b981;border-color:#10b981}.fav-btn.is-fav{color:#f59e0b;background:#f59e0b15;border-color:#f59e0b50}.formula-bar{background:var(--bg-input);border-radius:var(--radius-sm);border:1px solid var(--border-light);flex-wrap:wrap;align-items:center;gap:8px;margin-top:10px;padding:6px 10px;display:flex}.formula-label{text-transform:uppercase;letter-spacing:.5px;color:var(--text-muted);font-size:10px;font-weight:600}.formula-text{color:var(--text-secondary);font-size:12px;font-weight:500}.quick-ref-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:background var(--transition), border var(--transition);margin-top:12px;padding:12px}.quick-ref-title{color:var(--text-primary);letter-spacing:-.2px;margin-bottom:8px;font-size:13px;font-weight:700}.quick-ref-list{flex-direction:column;gap:4px;list-style:none;display:flex}.quick-ref-item{color:var(--text-secondary);background:var(--bg-input);border-radius:var(--radius-sm);border-left:3px solid var(--accent);font-variant-numeric:tabular-nums;padding:4px 8px;font-size:11px;font-weight:500}.favorites-bar{margin-top:12px}.favorites-title{color:var(--text-primary);margin-bottom:6px;font-size:13px;font-weight:700}.favorites-chips{flex-wrap:wrap;gap:4px;display:flex}.fav-chip{background:var(--bg-card);border:1px solid var(--border);color:var(--text-secondary);transition:all var(--transition);box-shadow:var(--shadow-sm);border-radius:100px;align-items:center;gap:4px;padding:4px 8px;font-size:13px;font-weight:500;display:flex}.fav-chip:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.fav-chip-icon{font-size:14px}.fav-chip-text{white-space:nowrap}.history-panel{max-width:700px}.history-section{margin-bottom:16px}.history-section-header{justify-content:space-between;align-items:center;margin-bottom:14px;display:flex}.history-section-title{color:var(--text-primary);margin-bottom:14px;font-size:14px;font-weight:700}.history-section-header .history-section-title{margin-bottom:0}.clear-history-btn{color:#ef4444;border-radius:var(--radius-sm);transition:background var(--transition);padding:6px 12px;font-size:11px;font-weight:600}.clear-history-btn:hover{background:#ef444415}.history-list{flex-direction:column;gap:3px;display:flex}.history-item{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-md);transition:all var(--transition);text-align:left;align-items:center;gap:8px;width:100%;padding:6px 10px;display:flex}.history-item:hover{border-color:var(--accent);background:var(--accent-light)}.history-item-icon{flex-shrink:0;font-size:18px}.history-item-text{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;flex:1;font-size:12px;font-weight:500;overflow:hidden}.history-item-time{color:var(--text-muted);flex-shrink:0;font-size:10px}.history-item-badge{color:#f59e0b;flex-shrink:0;font-size:16px}.history-empty{color:var(--text-muted);text-align:center;background:var(--bg-card);border-radius:var(--radius-md);border:1px dashed var(--border);padding:12px;font-size:12px}@media (width<=900px){.mobile-header{display:flex}.sidebar{z-index:200;width:280px;transform:translate(-100%)}.sidebar-open{transform:translate(0)}.sidebar-overlay{z-index:150;display:block}.main-content{max-width:100%;margin-left:0;padding:72px 16px 32px}.converter-row{flex-direction:column;align-items:stretch}.swap-btn{margin:4px auto;transform:rotate(90deg)}.swap-btn:hover{transform:rotate(90deg)scale(1.08)}.swap-btn.swap-anim{animation:.3s swapRotateMobile}@keyframes swapRotateMobile{0%{transform:rotate(90deg)}to{transform:rotate(270deg)}}.converter-card{padding:20px}.value-input,.result-display,.result-value{font-size:20px}.converter-title{font-size:22px}}@media (width<=480px){.main-content{padding:64px 12px 24px}.converter-card{padding:16px}.value-input,.result-display{padding:12px;font-size:18px}.result-value{font-size:18px}.action-row{flex-direction:column}.action-btn{text-align:center}}.footer{border-top:1px solid var(--border);text-align:center;color:var(--text-muted,#888);padding:8px 16px;font-size:.8rem}.footer a{color:var(--text-muted,#888)}