:root{--bg-color: #1F1F28;--bg-card: #2A2A37;--bg-input: #16161D;--fg-color: #DCD7BA;--fg-dim: #727169;--accent-color: #7E9CD8;--accent-hover: #9CABCA;--success-color: #98BB6C;--error-color: #C34043;--border-color: #363646;--shadow-color: rgba(22, 22, 29, .4);--font-family: "Inter", system-ui, -apple-system, sans-serif;--transition-speed: .2s;--border-radius: 12px}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-color);color:var(--fg-color);min-height:100vh;display:flex;justify-content:center;align-items:center;padding:2rem 1rem}#app{width:100%;max-width:800px;display:flex;flex-direction:column;gap:2rem}header{text-align:center}h1{font-size:2.5rem;font-weight:700;letter-spacing:-.05em;margin-bottom:.5rem}h1 .accent{color:var(--accent-color)}header p{color:var(--fg-dim);font-size:1.1rem}.card{background-color:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--border-radius);padding:1.5rem;box-shadow:0 4px 20px var(--shadow-color);transition:box-shadow var(--transition-speed)}.card:hover{box-shadow:0 8px 30px var(--shadow-color)}.calculator-container{display:flex;flex-direction:column;gap:1.5rem}.input-group{margin-bottom:1.5rem;display:flex;flex-direction:column;gap:.5rem}.input-group:last-child{margin-bottom:0}label{font-weight:600;font-size:.95rem;color:var(--fg-color)}input[type=text]{background-color:var(--bg-input);border:2px solid var(--border-color);color:var(--fg-color);font-family:monospace;font-size:1.25rem;padding:.75rem 1rem;border-radius:8px;outline:none;transition:border-color var(--transition-speed)}input[type=text]:focus{border-color:var(--accent-color)}input[type=text].invalid{border-color:var(--error-color)}.mask-dropdown{background-color:var(--bg-input);border:1px solid var(--border-color);color:var(--fg-color);font-family:monospace;font-size:.95rem;padding:.25rem .5rem;border-radius:6px;outline:none;cursor:pointer;transition:border-color var(--transition-speed)}.mask-dropdown:focus{border-color:var(--accent-color)}.mask-dropdown option{background-color:var(--bg-input);color:var(--fg-color)}.error-msg{color:var(--error-color);font-size:.85rem;display:none;margin-top:-.25rem}.invalid+.error-msg{display:block}.slider-container{display:flex;align-items:center;gap:1rem}.slider-container span{font-weight:600;color:var(--fg-dim);min-width:2rem}input[type=range]{flex-grow:1;accent-color:var(--accent-color);height:6px;background:var(--bg-input);border-radius:8px;outline:none;-webkit-appearance:none;appearance:none}input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;appearance:none;width:20px;height:20px;border-radius:50%;background:var(--accent-color);cursor:pointer;transition:transform var(--transition-speed),background var(--transition-speed)}input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.2);background:var(--accent-hover)}.result-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem}.result-item.span-2{grid-column:1 / -1}.result-item{display:flex;flex-direction:column;gap:.4rem}.result-item .label{font-size:.85rem;color:var(--fg-dim);text-transform:uppercase;letter-spacing:.05em;font-weight:600}.value-container{display:flex;align-items:center;justify-content:space-between;background-color:var(--bg-input);padding:.75rem 1rem;border-radius:8px;border:1px solid var(--border-color);transition:border-color var(--transition-speed)}.value-container:hover{border-color:var(--accent-color)}.value{font-family:monospace;font-size:1.1rem;color:var(--fg-color);word-break:break-all}.value.highlight{color:var(--success-color);font-weight:700}.copy-btn{background:none;border:none;color:var(--accent-color);font-weight:600;font-size:.85rem;cursor:pointer;padding:.25rem .5rem;border-radius:4px;transition:background-color var(--transition-speed),color var(--transition-speed);opacity:0}.value-container:hover .copy-btn{opacity:1}.copy-btn:hover{background-color:var(--accent-color);color:var(--bg-input)}footer{text-align:center;color:var(--fg-dim);font-size:.9rem;margin-top:1rem}.toast{position:fixed;bottom:2rem;left:50%;transform:translate(-50%) translateY(100px);background:var(--success-color);color:var(--bg-input);padding:.75rem 1.5rem;border-radius:30px;font-weight:600;box-shadow:0 4px 15px #0000004d;opacity:0;transition:transform .3s cubic-bezier(.175,.885,.32,1.275),opacity .3s;z-index:1000}.toast.show{transform:translate(-50%) translateY(0);opacity:1}@media(max-width:600px){.result-grid{grid-template-columns:1fr}.copy-btn{opacity:1}}