:root{--primary-color:#4a9eff;--secondary-color:#8a2be2;--accent-color:#ff69b4;--bg-primary:#1a1f26;--bg-secondary:#2a2f36;--bg-tertiary:#3a3f46;--border-color:#3a3f46;--text-primary:#e0e0e0;--text-secondary:#8a9ba8;--success-color:#2e7d32;--error-color:#c62828;--warning-color:#ff8f00;}*{margin:0;padding:0;box-sizing:border-box;font-family:'Segoe UI','Microsoft YaHei',sans-serif;}body{background-color:var(--bg-primary);color:var(--text-primary);line-height:1.6;padding:20px;max-width:600px;margin:0 auto;}header{text-align:center;margin-bottom:40px;padding:20px;}.logo-container{width:120px;height:120px;margin:0 auto 20px;border-radius:50%;display:flex;align-items:center;justify-content:center;overflow:hidden;}.logo-container img{width:100%;height:100%;object-fit:contain;border-radius:50%;}h1{background:linear-gradient(to right,var(--primary-color),var(--secondary-color),var(--accent-color));-webkit-background-clip:text;background-clip:text;color:transparent;font-size:2.5rem;margin-bottom:10px;font-weight:700;text-shadow:0 2px 10px rgba(74,158,255,0.3);}.subtitle{color:var(--text-secondary);font-size:1.1rem;}.card{background-color:var(--bg-primary);border-radius:8px;padding:25px;margin-bottom:25px;box-shadow:0 4px 12px rgba(0,0,0,0.3);border:1px solid var(--border-color);width:95%;margin:0 auto;}.dropdown-label{color:var(--text-secondary);font-size:1rem;font-weight:600;margin-bottom:8px;text-align:center;}.dropdown{position:relative;margin:15px 0;width:95%;margin:15px auto;}.dropdown-toggle{width:100%;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:6px;padding:12px 15px;color:var(--text-primary);font-size:1rem;cursor:pointer;display:flex;justify-content:center;align-items:center;transition:background-color 0.3s;text-align:center;}.dropdown-toggle:hover{background-color:var(--bg-tertiary);}.dropdown-toggle::after{content:'';display:none;}.dropdown.open .dropdown-toggle::after{transform:none;}.dropdown-menu{position:absolute;top:100%;left:0;width:100%;background-color:var(--bg-secondary);border:1px solid var(--border-color);border-top:none;border-radius:0 0 6px 6px;max-height:0;overflow:hidden;transition:max-height 0.3s ease;z-index:10;border:none;opacity:0;visibility:hidden;transform:translateY(-5px);transition:all 0.3s ease;text-align:center;}.dropdown-menu::-webkit-scrollbar{display:none;width:0;height:0;}.dropdown.open .dropdown-menu{max-height:300px;overflow-y:auto;scrollbar-width:none;-ms-overflow-style:none;box-shadow:0 4px 12px rgba(0,0,0,0.3);border:1px solid var(--border-color);border-top:none;opacity:1;visibility:visible;transform:translateY(0);}.dropdown.open .dropdown-menu::-webkit-scrollbar{display:none;width:0;height:0;}.dropdown-item{padding:12px 15px;cursor:pointer;transition:background-color 0.2s;border-bottom:1px solid var(--border-color);width:100%;box-sizing:border-box;margin:0;text-align:center;display:flex;justify-content:center;align-items:center;}.dropdown-item:first-child{border-top:none;}.dropdown-item:last-child{border-bottom:1px solid var(--border-color);}.dropdown.open .dropdown-item:last-child{border-radius:0 0 5px 5px;}.dropdown-item:hover,.dropdown-item.selected{background-color:var(--bg-tertiary);}.dropdown-item.selected{color:var(--primary-color);}.server-info{padding:12px 0;margin:15px 0;text-align:center;font-size:1rem;}.server-label{color:var(--text-secondary);font-size:0.9rem;}.server-value{color:var(--text-secondary);font-size:0.9rem;}.btn{background:linear-gradient(135deg,var(--primary-color),#6ab1ff);color:white;border:none;padding:12px 25px;border-radius:6px;cursor:pointer;font-size:1rem;font-weight:600;transition:all 0.3s;display:flex;align-items:center;justify-content:center;gap:8px;width:180px;margin:30px auto 20px;position:relative;overflow:hidden;box-shadow:0 4px 15px rgba(74,158,255,0.3);}.btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:all 0.5s;}.btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(74,158,255,0.5);}.btn:hover::before{left:100%;}.btn:disabled{background:linear-gradient(135deg,#2a3f5f,#3a4f6f);cursor:not-allowed;transform:none;box-shadow:none;}.btn-spinner{display:none;width:1em;height:1em;border:2px solid transparent;border-top:2px solid currentColor;border-radius:50%;animation:spin 1s linear infinite;}.btn-loading .btn-spinner{display:inline-block;}@keyframes spin{to{transform:rotate(360deg);}}.result{margin:20px 0;padding:20px;border-radius:8px;background-color:var(--bg-secondary);border:1px solid var(--border-color);width:95%;margin:20px auto;}.nat-type{font-size:1.8rem;font-weight:bold;margin:10px 0;color:var(--primary-color);text-align:center;}.description{color:var(--text-secondary);margin-top:10px;text-align:center;}.detail-info{margin-top:15px;font-size:0.9rem;color:var(--text-secondary);word-break:break-all;overflow-wrap:break-word;}.detail-info div{line-height:1.4;margin-bottom:5px;}.server-status{display:inline-block;font-size:0.8rem;padding:3px 8px;border-radius:10px;margin-left:10px;}.server-status.online{background-color:var(--success-color);color:#a5d6a7;}.server-status.offline{background-color:var(--error-color);color:#ffabab;}.server-status.unknown{background-color:var(--border-color);color:#b0bec5;}.server-status.testing{background-color:var(--warning-color);color:#ffe0b2;}.server-item-content{display:flex;flex-direction:column;gap:4px;align-items:center;text-align:center;}.server-item-name{font-weight:600;color:var(--text-primary);margin-bottom:2px;}.server-item-desc{font-size:0.8rem;color:var(--text-secondary);line-height:1.3;}footer{text-align:center;margin-top:50px;padding:20px;color:var(--text-secondary);}footer p{margin:0;line-height:1.5;}footer a{color:var(--text-secondary);text-decoration:none;transition:color 0.3s;margin-left:5px;}footer a:hover{color:var(--primary-color);text-decoration:underline;}@media (max-width:768px){.logo-container{width:100px;height:100px;}h1{font-size:2rem;}.card{width:100%;padding:20px;}.dropdown{width:100%;}.result{width:100%;}footer p{font-size:0.9rem;}}@media (max-width:480px){body{padding:10px;}h1{font-size:1.8rem;}.card{padding:15px;}.btn{width:160px;padding:10px 20px;}.nat-type{font-size:1.5rem;}}