:root{--primary-color:#4361ee;--secondary-color:#3a0ca3;--accent-color:#7209b7;--light-color:#f8f9fa;--dark-color:#212529;--gray-color:#6c757d;--success-color:#4cc9f0;--warning-color:#f72585;--key-display-bg:#e9ecef;--border-radius:12px;--box-shadow:0 8px 24px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif}body{background-color:#f0f2f5;color:var(--dark-color);line-height:1.6;min-height:100vh;display:flex;flex-direction:column}.container{width:100%;max-width:1000px;margin:0 auto;padding:0 20px;flex:1}header{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));color:white;padding:20px 0;box-shadow:0 4px 12px rgba(0,0,0,0.1)}.header-content{display:flex;justify-content:space-between;align-items:center}.logo{display:flex;align-items:center;gap:15px}.logo i{font-size:2.5rem}.logo h1{font-size:1.8rem;font-weight:700}main{padding:40px 0}.section-title{font-size:1.8rem;margin-bottom:25px;color:var(--secondary-color);display:flex;align-items:center;gap:10px}.tool-detail{background:white;border-radius:var(--border-radius);padding:40px;box-shadow:var(--box-shadow);text-align:center}.key-display-area{margin-bottom:40px;padding:40px;background-color:var(--key-display-bg);border-radius:16px;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;border:4px dashed #ccc;transition:var(--transition)}.key-display-area.active{border-color:var(--primary-color);background-color:#eef2ff}.big-key{font-size:8rem;font-weight:700;color:var(--primary-color);line-height:1;margin-bottom:20px;text-shadow:2px 2px 0px rgba(0,0,0,0.1)}.hint-text{font-size:1.2rem;color:var(--gray-color)}.info-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px;text-align:left}.info-card{background:#f8f9fa;padding:20px;border-radius:8px;border-left:4px solid var(--primary-color)}.info-label{font-size:0.9rem;color:var(--gray-color);margin-bottom:5px}.info-value{font-size:1.5rem;font-weight:700;color:var(--dark-color);word-break:break-all}.history-section{margin-top:40px;text-align:left}.history-title{font-size:1.2rem;margin-bottom:15px;color:var(--secondary-color);display:flex;justify-content:space-between;align-items:center}.key-history{display:flex;flex-wrap:wrap;gap:10px}.history-item{background:white;border:1px solid #ddd;padding:8px 15px;border-radius:6px;font-family:'Consolas',monospace;box-shadow:0 2px 4px rgba(0,0,0,0.05);animation:fadeIn 0.3s ease}.history-code{font-weight:bold;color:var(--primary-color)}@keyframes fadeIn{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}.btn-clear{background:var(--warning-color);color:white;border:none;padding:5px 15px;border-radius:4px;cursor:pointer;font-size:0.9rem}.btn-clear:hover{background-color:#d1146a}.mobile-alert{display:none;background-color:#fff3cd;color:#856404;padding:15px;border-radius:8px;margin-bottom:20px;border:1px solid #ffeeba}@media (max-width:768px){.big-key{font-size:5rem}.mobile-alert{display:block}}