.tool-container{max-width:800px;margin:2rem auto;padding:0 1rem}.tool-header{text-align:center;margin-bottom:3rem}.tool-title{font-size:2.5rem;font-weight:700;color:#1f2937;margin-bottom:1rem;background:linear-gradient(135deg,#38bdf8,#3b82f6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.tool-description{font-size:1.1rem;color:#6b7280;line-height:1.6;max-width:600px;margin:0 auto}.form-group{margin-bottom:2rem}.form-label{display:block;font-weight:600;color:#374151;margin-bottom:.75rem;font-size:1rem;background:linear-gradient(135deg,#64748b,#475569);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.form-textarea{width:100%;padding:1.25rem;border:2px solid rgba(226,232,240,.8);border-radius:12px;font-size:1rem;color:#1f2937;background:#ffffffe6;transition:all .3s ease;box-sizing:border-box;resize:vertical;min-height:100px;line-height:1.5}.form-textarea:focus{outline:none;border-color:#38bdf8;background:#fff;color:#0f172a;box-shadow:0 0 0 4px #38bdf833,0 8px 25px #38bdf826;transform:translateY(-2px)}.form-input{width:100%;padding:1rem 1.25rem;border:2px solid rgba(226,232,240,.8);border-radius:12px;font-size:1rem;color:#1f2937;background:#ffffffe6;transition:all .3s ease;box-sizing:border-box;font-weight:500}.form-input:focus{outline:none;border-color:#38bdf8;background:#fff;color:#0f172a;box-shadow:0 0 0 4px #38bdf833,0 8px 25px #38bdf826;transform:translateY(-2px);font-weight:600}.options-row{display:grid;grid-template-columns:1fr 1fr;gap:2rem;margin-bottom:2rem}.form-select{width:100%;padding:1rem 3rem 1rem 1.25rem;border:2px solid rgba(226,232,240,.8);border-radius:12px;font-size:1rem;color:#1f2937;background:#ffffffe6;transition:all .3s ease;box-sizing:border-box;cursor:pointer;font-weight:500;appearance:none;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");background-position:right 1rem center;background-repeat:no-repeat;background-size:1.25rem}.form-select:focus{outline:none;border-color:#38bdf8;background-color:#fff;color:#0f172a;box-shadow:0 0 0 4px #38bdf833,0 8px 25px #38bdf826;transform:translateY(-2px);font-weight:600}.result-section{margin-bottom:2rem}.hmac-result-container{position:relative;margin-top:.75rem}.hmac-result{min-height:80px;padding:1.5rem 4rem 1.5rem 1.5rem;background:#f8fafce6;border:2px solid rgba(203,213,225,.8);border-radius:12px;font-family:Monaco,Menlo,Ubuntu Mono,monospace;font-size:.9rem;color:#374151;word-break:break-all;line-height:1.6;display:flex;align-items:center;transition:all .3s ease}.hmac-result.loading{background:linear-gradient(90deg,#38bdf81a,#38bdf833,#38bdf81a);background-size:200% 100%;animation:loading 1.5s infinite}.hmac-result.has-content{color:#1f2937;font-weight:500}.copy-icon-btn{position:absolute;right:1rem;top:50%;transform:translateY(-50%);width:2.5rem;height:2.5rem;border:2px solid rgba(226,232,240,.8);background:#ffffffe6;border-radius:8px;cursor:pointer;transition:all .3s ease;display:flex;align-items:center;justify-content:center;font-size:1rem}.copy-icon-btn:hover{background:#38bdf81a;border-color:#38bdf880;transform:translateY(-50%) scale(1.05)}.button-group{display:flex;justify-content:center;margin-top:2rem}.form-button{padding:1rem 2rem;border-radius:12px;font-weight:600;font-size:1rem;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);border:none;min-width:140px;background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;box-shadow:0 8px 25px #3b82f64d}.form-button:hover:not(:disabled){background:linear-gradient(135deg,#2563eb,#1d4ed8);transform:translateY(-3px);box-shadow:0 12px 35px #3b82f666}.form-button:disabled{opacity:.5;cursor:not-allowed;transform:none!important}@keyframes loading{0%{background-position:200% 0}to{background-position:-200% 0}}@media (max-width: 768px){.options-row{grid-template-columns:1fr;gap:1.5rem}.tool-title{font-size:2rem}.hmac-result{padding:1.25rem 3rem 1.25rem 1.25rem;font-size:.8rem}}