* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', 'Microsoft YaHei', 'PingFang SC', sans-serif;
}
:root {
    --primary: #2563eb;
    --primary-light: #3b82f6;
    --primary-dark: #1d4ed8;
    --secondary: #64748b;
    --neutral: #f8fafc;
    --neutral-dark: #1e293b;
    --card-bg: #ffffff;
    --border: #e2e8f0;
    --success: #10b981;
    --error: #ef4444;
    --shadow-sm: 0 2px 6px rgba(0,0,0,0.05);
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.12);
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}
body {
    background: linear-gradient(145deg, #f0f4ff 0%, #f8fafc 100%);
    color: var(--neutral-dark);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 20px 0;
}
.container {
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
    flex: 1;
}
.header {
    text-align: center;
    margin: 40px 0 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}
.header h1 {
    color: var(--neutral-dark);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}
.header p {
    color: var(--secondary);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}
.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 15px;
    border: 1px solid var(--border);
    transition: var(--transition);
}
.card:hover {
    box-shadow: var(--shadow-md);
}
.query-form {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    align-items: center;
}
#ipInput {
    flex: 1;
    padding: 16px 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 16px;
    transition: var(--transition);
    background: var(--neutral);
}
#ipInput:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}
#queryBtn {
    padding: 16px 30px;
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.2);
}
#queryBtn:hover {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.3);
}
.quick-actions {
    display: flex;
    gap: 12px;
    margin-top: 20px;
    flex-wrap: wrap;
}
.quick-btn {
    padding: 10px 18px;
    background: var(--neutral);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    color: var(--secondary);
    transition: var(--transition);
    font-weight: 500;
}
.quick-btn:hover {
    background: #e0e7ff;
    border-color: var(--primary-light);
    color: var(--primary-dark);
}
.quick-btn.active {
    background: #dbeafe;
    border-color: var(--primary);
    color: var(--primary-dark);
}
.result-container {
    margin-top: 1px;
}
.result-card {
    background: #ffffff !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border-radius: var(--radius);
    padding: 20px 30px;
    margin-bottom: 15px;
    line-height: 1.5;
    border: 1px solid var(--border);
}
.ip-type-badge {
    display: inline-block;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
    margin-left: 10px;
}
.ipv4-badge {
    background: #dbeafe;
    color: #3b82f6;
}
.ipv6-badge {
    background: #d1fae5;
    color: #10b981;
}
.info-item {
    padding: 12px 0;
    display: flex;
    border-bottom: 1px solid var(--border);
    align-items: center;
}
.info-item:last-child {
    border-bottom: none;
}
.info-label {
    width: 140px;
    font-weight: 600;
    color: var(--secondary);
    font-size: 15px;
}
.info-value {
    flex: 1;
    font-size: 16px;
    color: var(--neutral-dark);
}
/* 无IPv6提示样式 */
.ipv6-tip {
    color: var(--secondary);
    background: #f8fafc;
    border-top: 1px dashed var(--border);
    margin-top: 10px;
    padding-top: 10px;
}
.loading {
    text-align: center;
    padding: 40px;
    color: var(--secondary);
    font-size: 16px;
}
.loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(59, 130, 246, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
    margin-left: 10px;
    vertical-align: middle;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.error {
    color: var(--error);
    padding: 20px;
    background: #fee2e2;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--error);
    font-size: 15px;
}
.copy-btn {
    background: var(--neutral);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    margin-left: 12px;
    font-size: 14px;
    color: var(--secondary);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.copy-btn::before {
    content: '📋';
}
.copy-btn:hover {
    background: #e2e8f0;
    color: var(--primary);
    border-color: var(--primary-light);
}
footer {
    text-align: center;
    padding: 25px 0;
    color: var(--secondary);
    font-size: 14px;
    border-top: 1px solid var(--border);
    margin-top: 40px;
}
/* 代理检测结果卡片样式（与原有IP结果卡片风格一致，独立显示） */
.proxy-check-card {
    background: #ffffff !important;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    border-radius: var(--radius);
    padding: 20px 30px;
    margin-bottom: 15px;
    line-height: 1.5;
    border: 1px solid var(--border);
}
@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .card {
        padding: 30px 20px;
    }
    
    .query-form {
        flex-direction: column;
        gap: 12px;
    }
    
    #ipInput, #queryBtn {
        width: 100%;
    }
    
    .info-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }
    
    .info-label {
        width: 100%;
        margin-bottom: 4px;
    }
}